FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27248-1E
ASSP for Power Supply Applications (Secondary battery)
DC/DC Converter IC for Charging Li-ion Battery
MB39A125/126
DESCRIPTION
MB39A125/126 is a DC/DC converter IC for charging Li-ion battery, which is suitable for down-conversion, and uses pulse width modulation (PWM) for controlling the output voltage and current independently. This IC integrates the build-in comparator for the voltage detection of the AC adapter, and selects the AC adapter or battery automatically for power supply to the system. Provides a wide range of power supply voltage, low standby current, and high efficiency, which makes them ideal as a built-in charging device in products such as notebook PC.
FEATURES
* * * * High efficiency : 97% (MAX) Built-in two constant current control circuits Analog control of the charging current value (+INE1, +INE2 terminal) Built-in AC adapter voltage detection function (ACOK, XACOK terminal) (Continued)
PACKAGES
24-pin plastic SSOP 28-pin plastic QFN
(FPT-24P-M03)
(LCC-28P-M11)
MB39A125/126
(Continued) * External output voltage setting resistor : MB39A125 * Built-in output voltage setting resistor : MB39A126 * Built-in charge stop function at low VCC * Output voltage setting accuracy : 0.74% (Ta = -10 C to +85 C) : MB39A125 : 12.6 V/16.8 V 0.8% (Ta = -10 C to +85 C) : MB39A126 * Built-in high accuracy current detection amplifier (5%) (At input voltage difference 100 mV) , (15%) (At input voltage difference 20 mV) * In IC standby mode (Icc = 0 A Typ) , make output voltage setting resistor open to prevent inefficient current loss * Built-in soft-start circuit * Standby current : 0 A (Typ) * Totem-pole type output for Pch MOS FET
2
MB39A125/126
PIN ASSIGNMENTS
* MB39A125
(TOP VIEW)
-INC2 OUTC2 +INE2 -INE2 ACOK
1
24
+INC2 GND
2
23
3
22
CS
4
21
VCC
5
20
OUT
VREF
6
19
VH
ACIN -INE1 +INE1 OUTC1
7
18
XACOK
8
17
RT -INE3 FB123
9
16
10
15
OUTD -INC1
11
14
CTL +INC1
12
13
(FPT-24P-M03)
(Continued)
3
MB39A125/126
(Continued)
(TOP VIEW)
XACOK -INE3 22 21 VCC OUT
VH
CS
28
27
26
25
24
23
N.C.
1
RT
FB123
GND +INC2 N.C. -INC2 OUTC2 +INE2
2
20
CTL +INC1 N.C. -INC1 OUTD
3
19
4
18
5
17
6 7
16
15
N.C.
8
9
10
11
12
13
14
ACOK
VREF
ACIN
(LCC-28P-M11) Note : Connect IC's radiation board at bottom side to potential of GND.
4
OUTC1
-INE2
-INE1
+INE1
MB39A125/126
* MB39A126
(TOP VIEW)
-INC2 OUTC2 +INE2 -INE2 ACOK
1
24
+INC2 GND
2
23
3
22
CS
4
21
VCC
5
20
OUT
VREF
6
19
VH
ACIN -INE1 +INE1 OUTC1
7
18
XACOK
8
17
RT -INE3 FB123
9
16
10
15
SEL -INC1
11
14
CTL +INC1
12
13
(FPT-24P-M03)
(Continued)
5
MB39A125/126
(Continued)
(TOP VIEW)
XACOK -INE3
22 21
OUT
VCC
VH
CS
28
27
26
25
24
23
N.C.
1
RT
FB123
GND +INC2 N.C. -INC2 OUTC2 +INE2
2
20
CTL +INC1 N.C. -INC1 SEL
3
19
4
18
5
17
6
16
7
15
N.C.
8
9
10
11
12
13
14
ACOK
VREF
ACIN
+INE1
(LCC-28P-M11) Note : Connect IC's radiation board at bottom side to potential of GND.
6
OUTC1
-INE2
-INE1
MB39A125/126
PIN DESCRIPTIONS
* MB39A125 : SSOP-24 Pin No. Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 -INC2 OUTC2 +INE2 -INE2 ACOK VREF ACIN -INE1 +INE1 OUTC1 OUTD -INC1 +INC1 CTL FB123 -INE3 RT XACOK VH OUT VCC CS GND +INC2 I/O I O I I O O I I I O O I I I O I O O O I Description Current detection amplifier (Current Amp2) inverted input terminal Current detection amplifier (Current Amp2) output terminal Error amplifier (Error Amp2) non-inverted input terminal Error amplifier (Error Amp2) inverted input terminal AC adapter voltage detection block (AC Comp.) output terminal ACOK = L when ACIN = H, ACOK = Hi-Z when ACIN = L, ACOK = Hi-Z when CTL = L Reference voltage output terminal AC adapter voltage detection block (AC Comp.) input terminal Error amplifier (Error Amp1) inverted input terminal Error amplifier (Error Amp1) non-inverted input terminal Current detection amplifier (Current Amp1) output terminal When IC is standby mode, this terminal is set to "Hi-Z" to prevent loss of inefficient current through the output voltage setting resistor. Set CTL terminal to "H" level to output "L" level. Current detection amplifier (Current Amp1) inverted input terminal Current detection amplifier (Current Amp1) non-inverted input terminal Power supply control terminal Setting the CTL terminal at "L" level places the IC in the standby mode. Error amplifier (Error Amp1, 2, 3) output terminal Error amplifier (Error Amp3) inverted input terminal Triangular wave oscillation frequency setting resistor connection terminal AC adapter voltage detection block ( AC Comp.) output terminal XACOK = Hi-Z when ACIN = H, XACOK = L when ACIN = L, XACOK = Hi-Z when CTL = L Power supply terminal for FET drive circuit (VH = VCC - 6 V) External FET gate drive terminal Power supply terminal for reference voltage, control circuit, and output circuit Soft-start setting capacitor connection terminal Ground terminal Current detection amplifier (Current Amp2) non-inverted input terminal
7
MB39A125/126
* MB39A125 : QFN-28 Pin No. Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 N.C. GND +INC2 N.C. -INC2 OUTC2 +INE2 -INE2 ACOK VREF ACIN -INE1 +INE1 OUTC1 N.C. OUTD -INC1 N.C. +INC1 CTL FB123 -INE3 RT XACOK VH OUT VCC CS
I/O I I O I I O O I I I O O I I I O I O O O No connection Ground terminal
Description
Current detection amplifier (Current Amp2) non-inverted input terminal No connection Current detection amplifier (Current Amp2) inverted input terminal Current detection amplifier (Current Amp2) output terminal Error amplifier (Error Amp2) non-inverted input terminal Error amplifier (Error Amp2) inverted input terminal AC adapter voltage detection block (AC Comp.) output terminal ACOK = L when ACIN = H, ACOK = Hi-Z when ACIN = L, ACOK = Hi-Z when CTL = L Reference voltage output terminal AC adapter voltage detection block (AC Comp.) input terminal Error amplifier (Error Amp1) inverted input terminal Error amplifier (Error Amp1) non-inverted input terminal Current detection amplifier (Current Amp1) output terminal No connection When IC is standby mode, this terminal is set to "Hi-Z" to prevent loss of inefficient current through the output voltage setting resistor. Set CTL terminal to "H" level to output "L" level. Current detection amplifier (Current Amp1) inverted input terminal No connection Current detection amplifier (Current Amp1) non-inverted input terminal Power supply control terminal Setting the CTL terminal at "L" level places the IC in the standby mode. Error amplifier (Error Amp1, 2, 3) output terminal Error amplifier (Error Amp3) inverted input terminal Triangular wave oscillation frequency setting resistor connection terminal AC adapter voltage detection block ( AC Comp.) output terminal XACOK = Hi-Z when ACIN = H, XACOK = L when ACIN = L, XACOK = Hi-Z when CTL = L Power supply terminal for FET drive circuit (VH = VCC - 6 V) External FET gate drive terminal Power supply terminal for reference voltage, control circuit, and output circuit Soft-start setting capacitor connection terminal
8
MB39A125/126
* MB39A126 : SSOP-24 Pin No. Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 -INC2 OUTC2 +INE2 -INE2 ACOK VREF ACIN -INE1 +INE1 OUTC1 SEL -INC1 +INC1 CTL FB123 -INE3 RT XACOK VH OUT VCC CS GND +INC2
I/O I O I I O O I I I O I I I I O I O O O I
Description Current detection amplifier (Current Amp2) inverted input terminal Current detection amplifier (Current Amp2) output terminal Error amplifier (Error Amp2) non-inverted input terminal Error amplifier (Error Amp2) inverted input terminal AC adapter voltage detection block (AC Comp.) output terminal ACOK = L when ACIN = H, ACOK = Hi-Z when ACIN = L, ACOK = Hi-Z when CTL = L Reference voltage output terminal AC adapter voltage detection block (AC Comp.) input terminal Error amplifier (Error Amp1) inverted input terminal Error amplifier (Error Amp1) non-inverted input terminal Current detection amplifier (Current Amp1) output terminal Charge voltage setting switch terminal (3cells or 4cells) SEL terminal "H" level : Charge voltage setting 16.8 V (4cells) SEL terminal "L" level : Charge voltage setting 12.6 V (3cells) Current detection amplifier (Current Amp1) inverted input terminal Current detection amplifier (Current Amp1) non-inverted input terminal Power supply control terminal Setting the CTL terminal at "L" level places the IC in the standby mode. Error amplifier (Error Amp1, 2, 3) output terminal Error amplifier (Error Amp3) inverted input terminal Triangular wave oscillation frequency setting resistor connection terminal AC adapter voltage detection block ( AC Comp.) output terminal XACOK = Hi-Z when ACIN = H, XACOK = L when ACIN = L, XACOK = Hi-Z when CTL = L Power supply terminal for FET drive circuit (VH = VCC - 6 V) External FET gate drive terminal Power supply terminal for reference voltage, control circuit, and output circuit Soft-start setting capacitor connection terminal Ground terminal Current detection amplifier (Current Amp2) non-inverted input terminal
9
MB39A125/126
* MB39A126 : QFN-28 Pin No. Pin Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 N.C. GND +INC2 N.C. -INC2 OUTC2 +INE2 -INE2 ACOK VREF ACIN -INE1 +INE1 OUTC1 N.C. SEL -INC1 N.C. +INC1 CTL FB123 -INE3 RT XACOK VH OUT VCC CS
I/O I I O I I O O I I I O I I I I O I O O O No connection Ground terminal
Description
Current detection amplifier (Current Amp2) non-inverted input terminal No connection Current detection amplifier (Current Amp2) inverted input terminal Current detection amplifier (Current Amp2) output terminal Error amplifier (Error Amp2) non-inverted input terminal Error amplifier (Error Amp2) inverted input terminal AC adapter voltage detection block (AC Comp.) output terminal ACOK = L when ACIN = H, ACOK = Hi-Z when ACIN = L, ACOK = Hi-Z when CTL = L Reference voltage output terminal AC adapter voltage detection block (AC Comp.) input terminal Error amplifier (Error Amp1) inverted input terminal Error amplifier (Error Amp1) non-inverted input terminal Current detection amplifier (Current Amp1) output terminal No connection Charge voltage setting switch terminal (3cells or 4cells) . SEL terminal "H" level : Charge voltage setting 16.8 V (4cells) SEL terminal "L" level : Charge voltage setting 12.6 V (3cells) Current detection amplifier (Current Amp1) inverted input terminal No connection Current detection amplifier (Current Amp1) non-inverted input terminal Power supply control terminal Setting the CTL terminal at "L" level places the IC in the standby mode. Error amplifier (Error Amp1, 2, 3) output terminal Error amplifier (Error Amp3) inverted input terminal Triangular wave oscillation frequency setting resistor connection terminal AC adapter voltage detection block ( AC Comp.) output terminal XACOK = Hi-Z when ACIN = H, XACOK = L when ACIN = L, XACOK = Hi-Z when CTL = L Power supply terminal for FET drive circuit (VH = VCC - 6 V) External FET gate drive terminal Power supply terminal for reference voltage, control circuit, and output circuit Soft-start setting capacitor connection terminal
10
MB39A125/126
BLOCK DIAGRAMS
* MB39A125
ACIN 7 + -INE1 8 - 1.4 V OUTC1 +INC1 -INC1 10 13 12 + x20 - VREF ACOK 5 XACOK 18
- +
0.2 V + - -INC1 (Vo) + 21 VCC
+INE1 -INE2
9
4
OUTC2 +INC2 -INC2 +INE2 FB123
2 24 1 3 15
+ x20 - - +
- Drive
20 OUT
-2.5 V -1.5 V VH Bias Voltage (VCC - 6 V) 19 VH
-INE3 OUTD
16
- + 4.2 V
11
VREF UVLO
VREF
< SOFT> 10 A Slope Control 500 kHz Max
4.2 V Bias
VCC
14 CTL
CS
22 CT (45 pF) 17 RT 6 VREF VREF 5.0 V
23 GND
11
MB39A125/126
* MB39A126
ACIN 7 + -INE1 8 - 1.4 V OUTC1 +INC1 -INC1 10 13 12 + x20 - VREF
ACOK 5
XACOK 18
- +
0.2 V + - -INC1 (Vo) + 21 VCC
+INE1 -INE2
9
4
OUTC2 +INC2 -INC2 +INE2 FB123
2 24 1 3 15
+ x20 - - +
- Drive
20 OUT
-2.5 V -1.5 V VH R1 - R2 + 4.2 V/3.15 V Bias Voltage (VCC - 6 V) 19 VH
-INE3
16
VREF UVLO
SEL 11 Hi : 4 Cells Lo : 3 Cells
VREF
< SOFT> 10 A Slope Control 500 kHz Max
4.2 V Bias
VCC
14 CTL
CS
22 CT (45 pF) 17 RT 6 VREF VREF 5.0 V
23 GND
12
MB39A125/126
ABSOLUTE MAXIMUM RATINGS
Rating Min -55 Max 28 60 700 740*
1 2
Parameter Power supply voltage Output current Peak output current Power dissipation Storage temperature
Symbol VCC IOUT IOUT PD TSTG
Condition VCC terminal Duty 5% (t = 1 / fosc x Duty) Ta +25 C (SSOP-24) Ta +25 C (QFN-28)
Unit V mA mA mW mW C
3700* +125
*1 : When mounted on a 10cm square epoxy double-sided. *2 : The packages are mounted on the dual-sided epoxy board (10 cm x 10 cm) . Connect IC's radiation board at bottom side to potential of GND. WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
13
MB39A125/126
RECOMMENDED OPERATION CONDITIONS
Value MIN 8 -1 0 0 0 0 -45 -600 0 0 0 0 0 0 0 0 100 27 -30 TYP 300 47 0.22 0.1 0.22 +25 MAX 25 0 30 5 VCC 25 +45 +600 VCC 25 1 25 1 17 2 25 500 130 1.0 1.0 1.0 +85
Parameter Power supply voltage Reference voltage Output current VH terminal output current Input voltage CTL terminal input voltage Output current Peak output current ACIN terminal input Voltage ACOK terminal output voltage ACOK terminal output current XACOK terminal output voltage XACOK terminal output current OUTD terminal output voltage : MB39A125 OUTD terminal output current : MB39A125 SEL terminal input voltage : MB39A126 Oscillation frequency Timing resistor Soft-start capacitor VH terminal capacitor Reference voltage output capacitor Operating ambient Temperature
Symbol VCC IREF IVH VINE VINC VCTL IOUT IOUT VACIN VACOK IACOK VXACOK IXACOK VOUTD IOUTD VSEL fOSC RT CS CVH CREF Ta
Condition VCC terminal +INE, -INE terminal +INC, -INC terminal Duty 5% (t = 1 / fosc x Duty)
Unit V mA mA V V V mA mA V V mA V mA V mA V kHz k F F F C
Note : The terminal number which has been described in the text is the one of the SSOP-24P package after this. WARNING: The recommended operating conditions are required in order to ensure the normal operation of the semiconductor device. All of the device's electrical characteristics are warranted when the device is operated within these ranges. Always use semiconductor devices within their recommended operating condition ranges. Operation outside these ranges may adversely affect reliability and could result in device failure. No warranty is made with respect to uses, operating conditions, or combinations not represented on the data sheet. Users considering application outside the listed conditions are advised to contact their FUJITSU representatives beforehand.
14
MB39A125/126
ELECTRICAL CHARACTERISTICS
(VCC = 19 V, VREF = 0 mA, Ta = +25 C) Parameter Symbol VREF1 Output voltage 1. Reference voltage block [REF] VREF2 VREF1 VREF2 Input stability Load stability Output current at short circuit 2. Under voltage lockout protection circuit block [UVLO] Threshold voltage Hysteresis width Line Load Ios VTLH VTHL VH Pin No. 6 6 6 6 6 6 6 6 6 6 Condition Ta = +25 C Ta = -10 C to +85 C Ta = +25 C Ta = -10 C to +85 C VCC = 8 V to 25 V VREF = 0 mA to -1 mA VREF = 1 V VREF = VREF = Value Min 4.95 Typ 5.000 Max 5.05 4.963 5.000 5.037 4.943 4.980 5.017 4.930 4.980 5.030 -50 2.6 2.4 3 1 -25 2.8 2.6 0.2* 10 10 -12 3.0 2.8 Unit V V V V mV mV mA V V V Remarks MB39A125 MB39A125 MB39A126 MB39A126
3. Charge Soft start block current [SOFT] Oscillation 4. frequency Triangular wave oscillator Frequency temperature block [OSC] stability Input offset voltage Input bias current Common mode input voltage range
ICS
22
RT = 47 k Ta = -30 C to +85 C
-14 270 -100 0
-10 300
-6 330 5 5 0.9 -60
A kHz % mV nA
fOSC f/fdt VIO IB
20
20
1*
3, 4, FB123 = 2 V 8, 9 3, 4, 8, 9 3, 4, 8, 9 15 15 15 15 15 15 DC AV = 0 dB FB123 = 2 V FB123 = 2 V
1 -30 100* 1.3* 5.0 0.8 -120 4.0
VCM Av BW VFBH VFBL
V dB MHz V V A mA
5-1. Error amplifier Voltage gain block Frequency [Error Amp1, bandwidth Error Amp2]
Output voltage
4.8 2.0
Output source ISOURCE current Output sink current * : Standard design value ISINK
(Continued) 15
MB39A125/126
(VCC = 19 V, VREF = 0 mA, Ta = +25 C) Parameter Input current Voltage gain Frequency bandwidth Output voltage Output source current Output sink current Symbol IINE Av BW VFBH VFBL ISOURCE Pin No. 16 15 15 15 15 15 Condition -INE3 = 0 V DC AV = 0 dB FB123 = 2 V FB123 = 2 V FB123 = 2 V, Ta = +25 C FB123 = 2 V, Ta = -10 C to +85 C Value Min -100 4.8 2.0 4.179 4.169 Typ -30 100* 1.3* 5.0 0.8 -120 4.0 4.200 4.200 Max 0.9 -60 4.220 4.231 Unit nA dB MHz V V A mA V V V V V V MB39A125 MB39A125 MB39A126 MB39A126 MB39A126 MB39A126 Remarks MB39A125
ISINK VTH1
15 16 16 12 12 12 12
5-2. Error amplifier block [Error Amp3]
VTH2 VTH3 VTH4 VTH5 VTH6 OUTD terminal output leak current OUTD terminal output ON resistance Input current Input resistance
Threshold voltage
SEL = 5 V, FB123 = 2 V, 16.700 16.800 16.900 Ta = +25 C SEL = 5 V, FB123 = 2 V, 16.666 16.800 16.934 Ta = -10 C to +85 C SEL = 0 V, FB123 = 2 V, 12.525 12.600 12.675 Ta = +25 C SEL = 0 V, FB123 = 2 V, 12.500 12.600 12.700 Ta = -10 C to +85 C OUTD = 17 V 0 1
ILEAK
11
A
MB39A125
RON
11
OUTD = 1 mA
35
50
MB39A125
IIN R1 R2
12 12, 16 16
-INC1 = 16.8 V
105 35
84 150 50
150 195 65
A k k
MB39A126 MB39A126 MB39A126 (Continued)
* : Standard design value
16
MB39A125/126
(VCC = 19 V, VREF = 0 mA, Ta = +25 C) Parameter Symbol Pin No. Condition Error Amp3 reference voltage = 4.2 V (4-cell setting) Error Amp3 reference voltage = 3.15 V (3-cell setting) SEL = 5 V SEL = 0 V Value Min 2 Typ Max 25 Unit Remarks
VON 5-2. SEL input Error voltage amplifier block [Error Amp3] Input current Input offset voltage
11
V
MB39A126
VOFF ISELH ISELL VIO
11 11 11
0 -3
50 0
0.8 100 1 +3
V A A mV
MB39A126 MB39A126 MB39A126
+INC1 = +INC2 = 1, 12, -INC1 = -INC2 = 13, 24 3 V to VCC +INC1 = +INC2 = 13, 24 3 V to VCC, VIN = -100 mV 1, 12 +INC1 = +INC2 = 3 V to VCC, VIN = -100 mV +INC1 = +INC2 = 3 V to VCC, VIN = -100 mV +INC1 = +INC2 = 0 V, VIN = -100 mV +INC1 = +INC2 = 0 V, VIN = -100 mV +INC1 = +INC2 = 3 V to VCC, VIN = -100 mV +INC1 = +INC2 = 3 V to VCC, VIN = -20 mV +INC1 = +INC2 = 0 V, VIN = -100 mV +INC1 = +INC2 = 0 V, VIN = -20 mV +INC1 = +INC2 = 3 V to VCC, VIN = -100 mV
I+INCH
20
30
A
0.1
0.2
A
MB39A125
Input current
I-INCH 1 I+INCL I-INCL VOUTC1 13, 24 1, 12 2, 10
-180 -195 1.9
0.1 -120 -130 2.0
0.2 2.1
A A A V
MB39A126
6. Current Detection Amplifier Block [Current Amp1, Current Amp2]
Current detection voltage
VOUTC2 VOUTC3 VOUTC4
2, 10 2, 10 2, 10 1, 12, 13, 24
0.34 1.8 0.2
0.40 2.0 0.4
0.46 2.2 0.6
V V V
Common mode input voltage range Voltage gain
VCM
0
VCC
V
Av
2, 10
19
20
21
V/V (Continued) 17
MB39A125/126
(VCC = 19 V, VREF = 0 mA, Ta = +25 C) Parameter Frequency bandwidth Output voltage Symbol BW VOUTCH VOUTCL Pin No. 2, 10 2, 10 2, 10 2, 10 Condition AV = 0 dB OUTC1 = OUTC2 = 2 V OUTC1 = OUTC2 = 2 V Duty cycle = 0% Duty cycle = 100% OUT = 13 V, Duty 5% (t = 1 / fosc x Duty) OUT = 19 V, Duty 5% (t = 1 / fosc x Duty) OUT = -45 mA OUT = 45 mA OUT = 3300 pF OUT = 3300 pF VCC = , -INC1 = 16.8 V VCC = , -INC1 = 16.8 V ACIN = ACIN = Value Min 4.7 150 1.4 Typ 2* 4.9 20 -2 300 1.5 2.5 Max 200 -1 2.6 Unit MHz V mV mA A V V Remarks
6. Current Detection Amplifier Block [Current Amp1, Current Amp2]
Output source cur- ISOURCE rent Output sink current ISINK VTL VTH
2, 10 15 15
7. PWM Comp. Threshold Block voltage [PWM Comp.]
Output source cur- ISOURCE rent 8. Output block [OUT] Output sink current Output ON resistance Rise time Fall time 9. Low Input Voltage Detection Block [UV Comp.] 10. AC Adapter Voltage Detection Block [AC Comp.] Threshold voltage Hysteresis width Threshold voltage Hysteresis width ISINK ROH ROL tr1 tf1 VTLH VTHL VH VTLH VTHL VH
20
-400*
mA
20 20 20 20 20 21 21 21 7 7 7
17.2 16.8 1.3 1.2
400* 6.5 5.0 50* 50* 17.4 17.0 0.4* 1.4 1.3 0.1*
9.8 7.5 17.6 17.2 1.5 1.4
mA ns ns V V V V V V
* : Standard design value (Continued)
18
MB39A125/126
(Continued) Symbol Pin No. (VCC = 19 V, VREF = 0 mA, Ta = +25 C) Condition Value Min Typ Max Unit Remarks
Parameter ACOK terminal output leak current 10. AC Adapter Voltage Detection Block [AC Comp.] ACOK terminal output ON resistance XACOK terminal output leak current XACOK terminal output ON resistance 11. Power Supply Control Block [CTL] CTL input voltage Input current
ILEAK
5
ACOK = 25 V
0
1
A
RON
5
ACOK = 1 mA
200
400
ILEAK
18
XACOK = 25 V
0
1
A
RON
18
XACOK = 1 mA
200 100 0 VCC - 6.0
400
VON VOFF ICTLH ICTLL
14 14 14 14
IC operation mode IC standby mode CTL = 5 V CTL = 0 V VCC = 8 V to 25 V, VH = 0 mA to 30 mA CTL = 0 V CTL = 5 V
2 0 VCC - 6.5
25 0.8 150 1 VCC - 5.5
V V A A
12. Bias Voltage Output Block Voltage [VH] Standby current Power supply current
VH
19
V
ICCS
21
0
10
A mA
13. General
ICC
21
5
7.5
* : Standard design value
19
MB39A125/126
TYPICAL CHARACTERISTICS
Power Supply Current vs. Power Supply Voltage Power supply current Icc (mA)
6 5 4 3 2 1 0 0 5 10 15 20 25 Ta = +25 C CTL = 5 V
CTL Terminal Input Current, Reference Voltage vs. CTL Terminal Input Voltage
1000
CTL terminal input current ICTL (A)
900 800 700 600 500 400 300 200 100 0 0 5 10 15 ICTL VREF
Ta = +25 C VCC = 19 V VREF = 0 mA
10 9 8 7 6 5 4 3 2 1
20
0 25
Power supply voltage VCC (V) Reference Voltage vs. Power Supply Voltage
6 6
CTL terminal input voltage VCTL (V) Reference Voltage vs. Load Current Reference voltage VREF (V)
5 4 3 2 1 0 0 5 10 15 20 25 30 35 Ta = +25 C VCC = 19 V CTL = 5 V
Reference voltage VREF (V)
5 4 3 2 1 0 0 5 10 15 20 25 Ta = +25 C CTL = 5 V VREF = 0 mA
Power supply voltage VCC (V) Reference Voltage vs. Operating Ambient Temperature
5.08 340
Load current IREF (mA) Triangular Wave Oscillation Frequency vs. Power Supply Voltage Triangular wave oscillation frequency fosc (kHz)
330 320 310 300 290 280 270 260 0 5 10 15 20 25 Ta = +25 C CTL = 5 V RT = 47 k
Reference voltage VREF (V)
5.06 5.04 5.02 5.00 4.98 4.96 4.94 4.92 -40 -20 0 20 40
VCC = 19 V CTL = 5 V VREF = 0 mA
60
80
100
Operating ambient temperature Ta ( C)
Power Supply Voltage VCC (V) (Continued)
20
Reference voltage VREF (V)
MB39A125/126
Triangular Wave Oscillation Frequency vs. Operating Ambient Temperature Triangular wave oscillation frequency fosc (kHz)
330 320 310 300 290 280 270 260 -40 -20 0 20 40 60 80 100 VCC = 19 V CTL = 5 V RT = 47 k
Triangular Wave Oscillation Frequency vs. Timing Resistor Triangular wave oscillation frequency fosc (kHz)
1000 Ta = +25 C VCC = 19 V CTL = 5 V
340
100
10
10
100
1000
Error amplifier threshold voltage VTH (V)
Operating ambient temperature Ta ( C) <MB39A125> Error Amplifier Threshold Voltage vs. Operating Ambient Temperature
4.28 4.26 4.24 4.22 4.20 4.18 4.16 4.14 4.12 -40 -20 0 20 40 60 80 100 VCC = 19 V CTL = 5 V VREF = 0 mA
Timing resistor RT (k)
Operating ambient temperature Ta ( C) Error Amplifier Threshold Voltage vs. Operating Ambient Temperature
12.70 VCC = 19 V CTL = 5 V SEL = 0 V
Error amplifier threshold voltage VTH (V)
16.90 VCC = 19 V CTL = 5 V SEL = 5 V
16.85
Error amplifier threshold voltage VTH (V)
Error Amplifier Threshold Voltage vs. Operating Ambient Temperature
12.65
16.80
12.60
16.75
12.55
16.70
-40
Operating ambient temperature Ta ( C)
-20
0
20
40
60
80
100
12.50 -40
Operating ambient temperature Ta ( C)
-20
0
20
40
60
80
100
(Continued) 21
MB39A125/126
Error Amplifier, Gain, Phase vs. Frequency
Ta = +25 C VCC = 19 V 180 10 k 10 k 2.4 k 4.2 V
Vcc = 19 V
40 30
240 k -INE1, 2 8 (4) + (3) +INE1, 2 9 - FB123 15 OUT
Phase (deg)
Gain Av (dB)
20 10 0 -10 -20 -30 -40 100 1k 10k 100k Av
90
IN
1 F
+
0
-90
10 k
10 k
Error Amp1 (Error Amp2)
-180 1M 10M
Frequency f (Hz) Error Amplifier, Gain, Phase vs. Frequency
40 30 20 Ta = +25 C VCC = 19 V 180 10 k IN 1F + 2.4 k 240 k -INE3 16 - + 10 k 4.2 V
10 0 -10 -20 -30 -40 100 1k 10k 100k 1M -90 Av 0
Phase (deg)
Gain Av (dB)
90
FB123 15
OUT
Error Amp3
-180 10M
Frequency f (Hz) Current Detection Amplifier, Gain, Phase vs. Frequency
40 30 20 Av 90 180 +INC VCC = 19 V OUTC 10 (2) OUT Current Amp1 (Current Amp2) 12.6 V 12.55 V
10 0 -10 -20 -30 -40 100 1k 10k 100k 1M 0
-90
-180 10M
Frequency f (Hz) (Continued) 22
Phase (deg)
Gain Av (dB)
+ 13 (24) x20 -INC - 12 (1)
MB39A125/126
(Continued) Power Dissipation vs. Operating Ambient Temperature (SSOP) Power dissipation PD (mW) Power dissipation PD (mW)
800 740 700 600 500 400 300 200 100 0 -40 -20 0 20 40 60 80 100 4000 3700 3500 3000 2500 2000 1500 1000 500 0 -40 -20 0 20 40 60 80 100
Power Dissipation vs. Operating Ambient Temperature (QFN)
Operating ambient temperature Ta ( C)
Operating ambient temperature Ta ( C)
23
MB39A125/126
FUNCTIONAL DESCRIPTION
1. DC/DC Converter Block
(1) Reference voltage block (REF) The reference voltage circuit uses the voltage supplied from the VCC terminal (pin 21) to generate a temperature compensated, stable voltage (5.0 V Typ) used as the reference power supply voltage for the IC's internal circuitry. This block can also be used to obtain a load current to a maximum of 1 mA from the reference voltage VREF terminal (pin 6) . (2) Triangular wave oscillator block (OSC) The triangular wave oscillator block has built-in capacitor for frequency setting into and generates the triangular wave oscillation waveform by connecting the frequency setting resistor with the RT terminal (pin 17) . The triangular wave is input to the PWM comparator circuits on the IC. (3) Error amplifier block (Error Amp1) This amplifier detects the output signal from the current detection amplifier (Current Amp1) , compares this to the +INE1 terminal (pin 9) , and outputs a PWM control signal to be used in controlling the charge current. In addition, an arbitrary loop gain can be set up by connecting a feedback resistor and capacitor between the FB123 terminal (pin 15) and -INE1 terminal (pin 8) , providing stable phase compensation to the system. (4) Error amplifier block (Error Amp2) This amplifier detects the output signal from the current detection amplifier (Current Amp2) , compares this to the +INE2 terminal (pin 3) , and outputs a PWM control signal to be used in controlling the charge current. In addition, an arbitrary loop gain can be set up by connecting a feedback resistor and capacitor between the FB123 terminal (pin 15) and -INE2 terminal (pin 4) , providing stable phase compensation to the system. (5) Error amplifier block (Error Amp3) This error amplifier (Error Amp3) detects the output voltage from the DC/DC converter and outputs the PWM control signal. MB39A125 can set the desired level of output voltage from 1 cell to 4 cells by connecting external output voltage setting resistors to the error amplifier inverted input terminal. MB39A126 can set the output voltage for 3 cells or 4 cells by SEL terminal (pin 11) input. In addition, an arbitrary loop gain can be set by connecting a feedback resistor and capacitor from the FB123 terminal (pin 15) to the -INE3 terminal (pin 16) , enabling stable phase compensation to the system. (6) Current detection amplifier block (Current Amp1) The current detection amplifier (Current Amp1) detects a voltage drop which occurs between both ends of the output sense resistor (RS2) due to the flow of the charge current, using the +INC1 terminal (pin 13) and -INC1 terminal (pin 12) . The signal amplified to 20 times is output to the OUTC1 terminal (pin 10) .
24
MB39A125/126
(7) Current detection amplifier block (Current Amp2) The current detection amplifier (Current Amp2) detects a voltage drop which occurs between both ends of the output sense resistor (RS1) due to the flow of the AC adapter current, using the +INC2 terminal (pin 24) and -INC2 terminal (pin 1) . The signal amplified to 20 times is output to the OUTC2 terminal (pin 2) . (8) PWM comparator block (PWM Comp.) The PWM comparator circuit is a voltage-pulse width converter for controlling the output duty of the error amplifiers (Error Amp1 to Error Amp3) depending on their output voltage. The PWM comparator circuit compares the triangular wave voltage the lowest generated by the triangular wave oscillator to the error amplifier output voltage and turns on the external output transistor, during the interval in which the triangular wave voltage is lower than the error amplifier output voltage. (9) Output block (OUT) The output circuit uses a totem-pole configuration capable of driving an external Pch MOS FET. The output "L" level sets the output amplitude to 6 V (Typ) using the voltage generated by the bias voltage block (VH) . This results in increasing conversion efficiency and suppressing the withstand voltage of the connected external transistor in a wide range of input voltages. (10) Power supply control block (CTL) Setting the CTL terminal (pin 14) low places the IC in the standby mode. (The power supply current is 10A at maximum in the standby mode.) CTL function table : MB39A125 CTL L H
Power OFF (Standby) ON (Active)
OUTD Hi-Z L
CTL function table : MB39A126 CTL L H
Power OFF (Standby) ON (Active)
(11) Bias voltage block (VH) The bias voltage circuit outputs VCC - 6 V (Typ) as the minimum potential of the output circuit. In the standby mode, this circuit outputs the potential equal to VCC.
25
MB39A125/126
2. Protection Functions
(1) Under voltage lockout protection circuit block (UVLO) The transient state or a momentary decrease in power supply voltage or internal reference voltage (VREF) , which occurs when the power supply (VCC) is turned on, may cause malfunctions in the control IC, resulting in breakdown or deterioration of the system. To prevent such malfunction, the under voltage lockout protection circuit detects internal reference voltage drop and fixes the OUT terminal (pin 20) to the "H" level. The system restores voltage supply when the internal reference voltage reaches the threshold voltage of the under voltage lockout protection circuit. Protection circuit (UVLO) operation function table : MB39A125 When UVLO is operating (VREF voltage is lower than UVLO threshold voltage, the logic of the following terminal is fixed.) OUTD OUT CS ACOK XACOK Hi-Z H L H L
Protection circuit (UVLO) operation function table : MB39A126 When UVLO is operating (VREF voltage is lower than UVLO threshold voltage, the logic of the following terminal is fixed.) OUT CS ACOK XACOK H L H L
(2) Low input voltage detection block (UV Comp.) UV Comp. detects that power supply voltage (VCC) is lower than the battery voltage +0.2 V (Typ) and fixes the OUT terminal (pin 20) to the "H" level. The system restores voltage supply when the power supply voltage reaches the threshold voltage of the AC adapter detection block. Protection circuit (UV Comp.) operation function table : MB39A125 When UV Comp. is operating (VCC voltage is lower than UV Comp. threshold voltage, the logic of the following terminal is fixed.) OUTD OUT CS L H L
Protection circuit (UV Comp.) operation function table : MB39A126 When UV Comp. is operating (VCC voltage is lower than UV Comp. threshold voltage, the logic of the following terminal is fixed.) OUT CS H L
26
MB39A125/126
3. Detection Function
(1) AC adapter voltage detection block (AC Comp.) When ACIN terminal (pin 7) voltage is lower than 1.3 V (Typ) , AC adapter voltage detection block (AC Comp.) outputs "Hi-Z" level to the ACOK terminal (pin 5) and outputs "L" level to the XACOK terminal (pin 18) . When CTL terminal (pin 14) is set to "L" level, ACOK terminal (pin 5) and XACOK terminal (pin 18) are fixed to "Hi-Z" level. ACIN ACOK XACOK H L L Hi-Z Hi-Z L
4. Switch Function : MB39A126
The charge voltage can be set to 16.8 V/12.6 V with the SEL terminal (pin 11) . SEL function table SEL H L DC/DC output setting voltage 16.8 V 12.6 V
27
MB39A125/126
CONSTANT CHARGING VOLTAGE AND CURRENT OPERATION
MB39A125/126 is DC/DC converter with the pulse width modulation (PWM) . MB39A125 is in the output voltage control loop, the Error Amp3 compares internal voltage reference voltage 4.2 V and DC/DC converter output to output the PWM controlled signal. MB39A126 is in the output voltage control loop, the Error Amp3 compares internal voltage reference voltage 4.2 V/3.15 V and DC/DC converter output to output the PWM controlled signal. In the charging current control loop, the voltage drop generated at both ends of charging current sense resistor (RS2) is sensed by +INC1 terminal (pin 13) , -INC1 terminal (pin 12) of Current Amp1, and the signal is output to OUTC1 terminal (pin 10) , which is amplified by 20 times. Error Amp1 compares the OUTC1 terminal (pin 10) voltage, which is the output of Current Amp1, and +INE1 terminal (pin 9) to output the PWM control signal and regulates the charging current. In the AC adapter current control loop, the voltage drop generated at both ends of AC adapter current sense resistor (RS1) is sensed by +INC2 terminal (pin 24) , -INC2 terminal (pin 1) of Current Amp2, and the signal is output to OUTC2 terminal (pin 2) , which is amplified by 20 times. Error Amp2 compares OUTC2 terminal (pin 2) voltage, which is output of Current Amp2, and +INE2 terminal (pin 3) voltage and outputs PWM controlled signal, and it limits the charging current due to the AC adapter current not to exceed the setting value. The PWM comparator compares the triangular wave to the smallest terminal voltage among the Error AMP1, Error AMP2 and Error AMP3. And the triangular wave voltage generated by the triangular wave oscillator. When the triangular wave voltage is smaller than the error amplifier output voltage, the main side output transistor is turned on.
28
MB39A125/126
SETTING THE CHARGE VOLTAGE
MB39A125 The charging voltage (DC/DC output voltage) can be set by connecting external output voltage setting resistors (R3, R4) to the -INE3 terminal (pin 16) . Be sure to select a resistor value that allows you to ignore the onresistance (35 , 1 mA) of the internal FET connected to the OUTD terminal (pin 11) . Battery charging voltage : Vo Vo (V) = (R3 + R4) / R4 x 4.2 (V)
B Vo R3
-INE3 16
- + 11 4.2 V
R4
OUTD
29
MB39A125/126
MB39A126 The setting of the charge voltage is switched to 3cells or 4cells by the SEL terminal (pin 11) . Charge voltage is set to 16.8 V when SEL terminal is "H" level, and charge voltage is set to 12.6 V when SEL terminal is "L" level. Battery charging voltage : Vo Vo (V) = (150 k + 50 k) / 50 k x 4.2 (V) = 16.8 (V) (SEL = H) Vo (V) = (150 k + 50 k) / 50 k x 3.15 (V) = 12.6 (V) (SEL = L)
-INC1 12 -INE3 16
R3
150 k
-
R4
50 k
+
SEL
11
3.15 V
4.2 V
30
MB39A125/126
SETTING THE CHARGE CURRENT
The charge current value can be set at the analog voltage value of the +INE1 terminal (pin 9) . Charge current formula : Ichg (A) = V+INE1 (V) / (20 x RS1 () ) Charge current setting voltage : V+INE1 (V) = 20 x Ichg (A) x RS1 ()
SETTING THE INPUT CURRENT
The input limit current value can be set at the analog voltage value of the +INE2 terminal (pin 3) . Input current formula : IIN (A) = V+INE2 (V) / (20 x RS2 () ) Input current setting voltage : V+INE2 (V) = 20 x IIN (A) x RS2 ()
SETTING THE TRIANGULAR WAVE OSCILLATION FREQUENCY
The triangular wave oscillation frequency can be set by the timing resistor (RT) connected to the RT terminal (pin 17) . Triangular wave oscillation frequency fosc fosc (kHz) = 14100 / RT (k) :
31
MB39A125/126
SETTING THE SOFT-START TIME
Soft-start function prevents rush current at start-up of IC when the Soft-start capacitor (Cs) is connected to the CS terminal (pin 22) . This IC charges external soft-start capacitor (Cs) with 10 A after CTL terminal (pin 14) voltage level becomes high and IC starts (when VCC UVLO threshold voltage) . Output ON duty depends on PWM comparator, which compares the FB123 terminal (pin 15) voltage with the triangular wave oscillator output voltage. During soft start, FB123 terminal (pin 15) voltage increases with sum voltage of CS terminal and diode voltage. Therefore, the output voltage of the DC/DC converter and current increase can be set by output ON duty in proportion to rise of CS terminal (pin 22) voltage. The ON Duty is affected by the ramp voltage of FB123 terminal (pin 15) until an output voltage of one Error Amp reaches the DC/DC converter loop controlled voltage. Soft-start time is obtained from the following formula : Soft-start time : ts (time to output on duty 80 %) ts (s) = 0.13 x Cs (F) : * Soft-start timing chart
CS CT FB123 CS FB123 CT 0V OUT 0V Error Amp3 threshold voltage Vo OUT
Vo
0V Io 0A Io
32
MB39A125/126
TRANSIENT RESPONSE AT LOAD-STEP
The constant voltage control loop and the constant current control loop are independent. With the load-step, these two control loops change. The battery voltage and current overshoot are generated by the delay time of the control loop when the mode changes. The delay time is determined by phase compensation constant. When the battery is removed if the charge control is switched from the constant current control to the constant voltage control, and the charging voltage does overshoot by generating the period controlled with high duty by output setting voltage. The excessive voltage is not applied to the battery because the battery is not connected. When the battery is connected if the charge control is switched from the constant voltage control to the constant current control, and the charging current does overshoot by generating the period controlled with high duty by charge current setting. The battery pack manufacturer in Japan thinks it is not the problem the current overshoot of 10 ms or less. * Timing chart at load-step
Error Amp3 Output
Error Amp1 Output
Error Amp1 Output
Error Amp3 Output
Constant Current
Constant Voltage
Constant Current
Battery Voltage
Battery Current
When charge control switches from the constant current control to the constant voltage control, the voltage does overshoot by generating the period controlled with high duty by output setting voltage.
The battery pack manufacturer in Japan thinks it is not the problem the current overshoot of 10 ms or less.
10 ms
33
MB39A125/126
AC ADAPTER DETECTION FUNCTION
When ACIN terminal (pin 7) voltage is lower than 1.3 V (Typ) , AC adapter voltage detection block (AC Comp.) outputs "Hi-Z" level to the ACOK terminal (pin 5) and outputs "L" level to the XACOK terminal (pin 18) . When CTL terminal (pin 14) is set to "L" level, ACOK terminal (pin 5) and XACOK terminal (pin 18) are fixed to "Hi-Z" level. (1) AC adapter presence If you connect as shown in the figure below the presence of AC adapter can be easily detected because the signal is output from the ACOK terminal (pin 5) to microcomputer etc. In this case, if the CTL terminal is set to "L" level, IC becomes the standby state (ICC = 0 A Typ). * Connection example of detecting AC adapter presence
AC adapter ACIN
micon
ACOK
XACOK
7
+ -
5
18
34
MB39A125/126
(2) Automatic changing system power supply between AC adapter and battery The AC adapter voltage is detected and external switch at input side and battery side can be changed automatically with the connection as follows. Connect CTL terminal (pin 14) to VCC terminal (pin 21) for this function. OFF duty cycle becomes 100% when CS terminal (pin 22) voltage is made to be 0 V, if it is needed after full charge. * Connection example of automatic changing system power supply between AC adapter and battery
System
AC adapter ACIN + - ACOK XACOK Battery
7
5
18
VCC
21
CTL
14
< SOFT> VREF 10 A
CS micon
22
35
MB39A125/126
(3) Battery selector function When control signal from microcomputer etc. is input to ACIN terminal (pin 7) as shown in the following diagram, ACOK terminal (pin 5) output voltage and XACOK terminal (pin 18) output voltage are controlled to select one of the two batteries for charge. Connect CTL terminal (pin 14) to VCC terminal (pin 21) for this function. OFF duty cycle becomes 100% when CS terminal (pin 22) voltage is made to be 0 V, if it is needed after full charge. * Connection example of battery selector function
System
AC adapter
7
ACIN
5
ACOK
18
XACOK
A ICHG
B
+ - VCC CTL
RS1
21 14
< SOFT> VREF 10 A
Battery1
Battery2
micon
CS
22
36
MB39A125/126
(4) When AC Comp. is not used When AC Comp. (ACIN (pin 7) , ACOK (pin 5) , and XACOK (pin 18) terminals) is not used as follows, connect the ACIN (pin 7) , ACOK (pin 5) , and XACOK (pin 18) terminals to GND terminal (pin 23) . And connect VCC terminal (pin 21) to system, as follows, to avoid the reverse current from the battery to the VCC terminal (pin 21) . * Connection example when AC Comp. is not used
System
AC adapter ACIN ACOK XACOK
7
+ - VCC
5
18
A ICHG
B
RS1 Battery
21
37
MB39A125/126
PHASE COMPENSATION
* Example Circuit
VIN RS2 15m
-INE3 Cc + 4.2 V Rc FB123 - -2.5V -1.5V
21
+ Drive
VCC
16
-
OUT
20
Lo RL VH
I1 VBATT RS1 33 m Co ESR Rin2 Rin1 Ro
19
VH (VCC - 6V)
15
OSC
Bias Voltage
Lo : Inductance RL : Equivalent series resistance of inductance Co : Capacity of condenser ESR : Equivalent series resistance of condenser Ro : Load resistance
* Frequency Characteristics of LC filter
Frequency characteristic of power output LC filter (DC gain is included.) 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 gain phase Gain 180 160 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 10M
Cut-off frequency
f1 (Hz) = Phase [deg] 2 1 Lo x Co x (Ro + ESR) (Ro + RL)
Gain [dB]
Phase
1
10
100
1k
10k
100k
1M
Frequency [Hz]
Lo = 15 H Co = 14.1 F Ro = 4.2 RL = 30 m ESR = 100 m
38
MB39A125/126
* Frequency Characteristics of Error Amp
Total frequency characteristic 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 1 total gain AMP Open Loop Gain total phase Gain 180 160 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 1M
Cut-off frequency
f2(Hz) = Phase [deg] 1 2 x Rc x Cc
Gain [dB]
Phase
Rc = 150 k Cc = 3300 pF
10
100
1k
10k
100k
Frequency [Hz]
* Frequency Characteristics of DC/DC converter
Total frequency characteristic 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 1 total gain AMP Open Loop Gain total phase
Gain
Phase
10
100
1k
10k
100k
180 160 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 1M
The overview of frequency characteristic for DC/DC converter can be obtained in combination between "Frequency Characteristics of LC filter" and "Frequency Characteristics of Error Amp " as mentioned above. Please note the following point in order to stabilize the frequency characteristics of DC/DC converter . Cut-off frequency of DC/DC converter should be set to half or less of the triangular wave oscillator frequency.
Frequency [Hz]
Triangular wave frequency
Notes : 1) Please review the Error Amp frequency characteristics, when LC filter parameter is modified. 2) When the ceramic capacitor is used as smoothing capacitor Co, phase margin is reduced because ESR of the ceramic capacitor is extremely small as shown in "Frequency Characteristics of LC filter which is using low ESR". Therefore, change phase compensation of Error Amp or create resistance equivalent to ESR using pattern.
Phase [deg]
Gain [dB]
39
MB39A125/126
* Frequency Characteristics of LC filter which is using low ESR
Frequency characteristic of power output LC filter (DC gain is included.) 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 gain phase Gain 180 160 140 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -180 10M
Cut-off frequency
f1 (Hz) = Phase [deg] 2 1 Lo x Co x (Ro + ESR) (Ro + RL)
Gain [dB]
Phase
Lo = 15 H Co = 14.1 F Ro = 4.2 RL = 30 m ESR = 100 m
1
10
100
1k
10k
100k
1M
Frequency [Hz]
<3Pole2Zero> DC/DC output
< Additional ESR>
- Board Pattern or connected resistor
+
40
MB39A125/126
PROCESSING WITHOUT USING OF THE CURRENT AMP1 AND AMP2
When Current Amp is not used, connect the +INC1 terminal (pin 13) , +INC2 terminal (pin 24) , -INC1 terminal (pin 12) , and -INC2 terminal (pin 1) to VREF terminal (pin 6) , and then leave OUTC1 terminal (pin 10) and OUTC2 terminal (pin 2) open. * Connection when Current Amp is not used
12 -INC1 1 -INC2 10 OUTC1 2 OUTC2
+INC1 13 +INC2 24
"open"
6
VREF
PROCESSING WITHOUT USING OF THE ERROR AMP1 AND AMP2
When Error Amp is not used, leave FB123 terminal (pin 15) open, connect the -INE1 terminal (pin 8) and -INE2 terminal (pin 4) to GND, and connect +INE1 terminal (pin 9) and +INE2 terminal (pin 3) to VREF terminal (pin 6) . * Connection when Error Amp is not used
9 +INE1 3 +INE2 8 -INE1 4 -INE2
GND
23
"open"
16 FB123 6 VREF
41
MB39A125/126
PROCESSING WITHOUT USING OF THE CS TERMINAL
When soft-start function is not used, leave the CS terminal (pin 22) open. * Connection when no soft-start time is specified
"open"
CS 22
42
MB39A125/126
I/O EQUIVALENT CIRCUIT
*
VCC 21 1.235 V + - 37.8 k 12.35 k GND 23 CTL 14 6 VREF 33.1 k 51 k GND
*
ESD protection element
ESD protection element
*
VREF (5.0 V)
*
VCC VREF (5.0 V)
*
VCC
22 CS + - 17 RT GND GND GND 9 +INE1 -INE1 8 FB123
*
VCC
*
VCC VREF (5.0 V) CS FB123 16 4.2 V 15 FB123
-INE2 4
GND 3 +INE2
GND
*
VCC
*
VCC
-INC1 12 10 OUTC1
-INC2 1 2 OUTC2
GND 13 +INC1
GND 24 +INC2
(Continued) 43
MB39A125/126
(Continued) *
VCC
* |
