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MC34063A
Industrial Standard, Universal DC/DC Converter
n FEATURES
l l l l l l
n DESCRIPTION
The MC34063A by Analog Integrations Corporation, an improved second source over the industrial standard MC34063A, is a monolithic control circuit containing the primary functions required for DC/DC converters. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This device is specifically designed to be incorporated in stepdown, step-up and voltage-inverting applications with a minimum number of external components. The 1.8% internal reference and low quiescent current of 1.6mA are among the improvements of the device over the competition.
3V to 30V Input Voltage Operation. Internal 1.6A Peak Current Switch. Internal 1.8% Reference. Low Quiescent Current at 1.6mA. Frequency Operation from 100Hz to 100KHz. Current Limiting.
n APPLICATIONS
l l
Saver for Cellular phones DC-DC Converter Module
n TYPICAL APPLICATION CIRCUIT
200H L CO 220F D1 1N5819
8
VOUT +
DRI IPK VCC FB
SC SE TC GND
1 2 3 4
*RS VIN + C1 100F
7 6 5
470pF
8.6V SAVER *:Io=0.3/RS RB RA 5.6K 33K
CT
MC34063A
Saver Circuit for Cellular Phone
n ORDERING INFORMATION
MC34063A CX PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE ORDER NUMBER MC34063ACN (PLASTIC DIP) MC34063ACS (PLASTIC SO) PIN CONFIGURATION
TOP VIEW
SC 1 SE 2 TC 3 GND 4
8 DRI 7 IPK 6 VCC 5 FB
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
DS-34063A-01 012102
1
MC34063A
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage ......................................................... ... ... ... ..................................... 30V ..................................... ... ... ... .................... -0.3V~30V Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage .......................................... ... ... ... ... ......................................30V ..................................... ... ... ... ... .............................................30V ........................ ... ... ... ..........................................30V
Switch Collector to Emitter Voltage Driver Collector Voltage Switch Current
.................................... ... ... ... ... ............................................30V
............................................... ... ... ... ... ..............................................1.6A
Power Dissipation and Thermal Characteristics DIP Package TA= 25C .................................. ... ... ... .............................1.0W .................... ... ... .......................100C /W
Thermal Resistance SO Package
TA= 25C .................................... ... ... ... ... .......................625mW Thermal Resistance .................... ... ... .......................160C /W
Operating Junction Temperature ................................... ... ... ... ..... .............................125C Operating Ambient Temperature Range .................... ... ...... ...............................0C~70C
Storage Temperature Range ........................ ... ... ... ... ....... ........................... - 65C~150C
2
MC34063A
n ELECTRICAL CHARACTERISTICS (VCC= 5V, TA=25C, unless otherwise
specified.) PARAMETER
Oscillator Charging Current Discharge Current Voltage Swing Discharge to Charge Current Ratio Current Limit Sense Voltage Output Switch Saturation Voltage, Darlington Connection Saturation Voltage DC Current Gain Collector Off-State Current Comparator Threshold Voltage Threshold Voltage Threshold Voltage Line Regulation Input Bias Current TA=25C 0CTA70C 3.0VVCC30V VIN=0V VIPK(SENSE)=VCC VPIN 5>VFB 5.0VVCC30V CT=0.001F, PIN 2=GND Remaining pins open REGLINE IIB VFB 1.227 1.21 0.1 0.4 1.25 1.273 V 1.29 0.3 1 mV/V A ISW =1.0A; VC(DRIVER)=VC(SWITCH) ISW =1.0A; IC(DRIVER)=50mA (Forced 20) ISW =1.0A; VCE=5.0V VCE=30V VCE(SAT) 1.0 1.3 V 5.0VVCC30V 5.0VVCC30V PIN 3 VIPK(SENSE) =VCC ICHG IDISCHG VOSC IDISCHG/ ICHG 10 100 25 150 0.6 6.0 40 200 A A V
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX. UNIT
ICHG=IDISCHG
VIPK(SENSE)
250
300
350
mV
VCE (SAT) hFE IC(OFF) 35
0.4 120 10
0.7
V
nA
Supply current
ICC
1.6
3
mA
3
MC34063A
n TYPICAL PERFORMANCE CHARACTERISTICS
tON-OFF Output Switch ON-OFF Time
2
1000
ICC, Supply Current (mA)
VCC=5V VIPK=VCC PIN 5=GND ON TIME
1.6
1.2
CT=1nF VIPK= VCC PIN 2=GND
100
0.8
10
OFF TIME
0.4
1
0.1
1
10
100
0 0 5 10 15 20 25 30
CT, Oscillator Timing Capacitor (nF) Fig. 1 Output Switch ON-OFF Time vs. Oscillator Timing Capacitor
VCC, Supply Voltage (V) Fig. 2 Standby Supply Current vs. Supply Voltage
1.3
350
VFB, Threshold Voltage (V)
1.28
VCC = 5V CT=1nF Pin 2= GND
VIPK, Threshold Voltage (mV)
340 330 320 310 300 290 280 270 260 250 0
VCC = 5V CT=1nF Pin 5= GND
1.26
1.24
1.22
1.2 0
10
20
30
40
50
60
70
80
10
20
30
40
50
60
70
80
Fig. 3
Temperature (C) VFB, Threshold Voltage vs. Temperature
Temperature (C) Fig. 4 IPK Threshold Voltage vs. Temperature
VCE(SAT) Saturation Voltage (V)
VCE(SAT) Saturation Voltage (V)
1.8
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0
1.7
1.6
VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND
VCC = 5V Pin 1, 7, 8=VCC Pin 3, 5= GND Darlington Connection
1.5
1.4
1.3
Forced Beta = 20
0.5 1 1.5
1.2
0
0.5
1
1.5
0
IE, Emitter Current (A) Fig. 5 Emmiter-Follower Configuration Output Switch Saturation Voltage vs. Emmiter Current
IC, Collector Current (A) Fig. 6 Common-Emitter Configuration Output Switch Saturation Voltage vs. Collector Current
4
MC34063A
n BLOCK DIAGRAM
SC 1 Q2 Q1 80 SE 2 7 IPK QS R 8 DRI
CT 3
IS Oscillator
TC
6 Comparator 1.25V Reference Voltage +
VCC
5 FB
GND
4
n PIN DESCRIPTIONS
PIN 1: SC PIN 2: SE PIN 3: TC - The switch collector is 1.6A. - Darlington switch emitter - Oscillator timing capacitor PIN 5: FB - Feedback comparator inverting input PIN 6: VCC - Power supply input PIN 7: IPK PIN 8: DRI - Highside current sense input, VCC - VIPK=300mV - Drive collector
PIN 4: GND - Power GND
5
MC34063A
n APPLICATION INFORMATION
*
DESIGN FORMULA TABLE CALCULATION
tON tOFF
(tON + tOFF) MAX CT IC (SWITCH) RS L(MIN)
STEP-DOWN
VOUT + VF VIN(MIN) - VSAT - VOUT
STEP-UP
VOUT + VF - VIN(MIN) VIN(MIN) - VSAT 1 FMIN
4 x 10 tON 2IOUT(MAX) (
-5
VOLTAGE-INVERTING
VOUT + VF VIN - VSAT
1 FMIN
4x10 tON 2IOUT(MAX) 0.33/IC(SWITCH)
-5
1 FMIN
4 x 10 tON 2IOUT(MAX) (
-5
t ON + t OFF ) t OFF
t ON + t OFF ) t OFF
0.33/ IC (SWITCH)
0.33/ IC (SWITCH)
(
VIN(MIN) - VSAT - VOUT )tON(MAX) IC(SWITCH)
(
VIN(MIN) - VSAT )tON(MAX) IC(SWITCH)
IOUT tON VRIPPLE(P - P)
(
VIN(MIN) - VSAT )tON(MAX) IC(SWITCH)
IOUT tON VRIPPLE(P - P)
Co
IC ( SWITCH) (t ON + t OFF ) 8V RIPPLE (P - P )
VSAT - Saturation voltage of the output switch. VF - Forward voltage drop of the ringback rectifier The following power supply characteristics must be chosen: VIN - Nominal input voltage. VOUT - Desired output voltage, VOUT =1.25 (1 + RB/RA) IOUT
- Desired output current.
FMIN - Minimum desired output switching frequency at the selected values for VIN and IOUT. VRIPPLE (P-P)- Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation.
6
MC34063A
n APPLICATION EXAMPLES
200H L + 8 RS 0.25 VIN 10~20V C1 + 100F MC34063A 7 6 5 DRI IPK VCC FB SC 1 SE TC GND 4 470pF CT RA 1K2 RB 3K6 2 3 D1 1N5821 CO 470F VOUT 5V/500mA
Line Regulation Load Regulation Short Circuit Current
VIN = 10V ~20V @ IO=500mA VIN = 15V, @ IO=10mA ~ 500mA VIN =15V, @ RL = 0.1 Fig. 1 Step-Down Converter
40mV 5mV 1.3A
R1 1K 8 DRI VIN 10~22V + C1 100F RA 1K2 RS 0.22 7 6 5 IPK VCC FB SC 1 SE TC GND 2 3 4 CT 470pF D1 1N5821 R2 470 Q1 200H L + Co 470F VOUT 5V/500mA
MC34063A RB 3K6
Fig. 2 Step-Down Converter with External PNP Saturation Switch
7
MC34063A
n APPLICATION EXAMPLES (Continued)
200H L R1 100 8 RS 0.22 VIN 8~16V + 100F C1 DRI SC SE TC GND MC34063A RB 47K 1 2 3 4 CT 100pF GS SS14 CO 220F + D1 VOUT 28V/200mA
7 IPK 6 VCC 5 FB
RA 2.2K
Line Regulation Load Regulation
VIN = 8V ~16V @ IO=200mA VIN = 12V, @ IO=80mA ~ 200mA Fig. 3 Step-Up Converter
100mV 5mV
L
D1 VOUT
R1 8 RS VIN + C1 RA 7 6 5 DRI IPK VCC FB SC 1 SE TC GND 2 3 R2 4 CT Q1 CO
+
MC34063A RB
Fig. 4 Step-Up Converter with External NPN Switch
8
MC34063A
n APPLICATION EXAMPLES (Continued)
1 SC 2 L 100H CT 680pF VOUT D1 1N5819 3 4 SE TC GND MC34063A 8 7 S RS 0.25 VIN 4.5V~6V
DRI IPK
VCC 6 FB 5 + C1 100F
-12V/100mA +
CO 470F
RA 953
RB 8.2K
Line Regulation Load Regulation
VIN = 4.5V ~6V @ IO=100mA VIN = 5V, @ IO=10mA ~ 100mA Fig.5 Inverting Converter
20mV 100mV
R2 8 DRI RS VIN + C1 7 IPK 6 VCC 5 FB SC 1 SE 2 TC 3 GND 4 MC34063A L CT D1 R1 Q1
RA RB
CO +
VOUT
Fig 6. Voltage Inverting Converter with PNP Saturated Switch
9
MC34063A
n
PHYSICAL DIMENSIONS
8 LEAD PLASTIC SO (unit: mm)
D
l
SYMBOL A
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80 5.80 0.40
MAX 1.75 0.25 0.51 0.25 5.00 4.00 6.20 1.27
A1 B C D
e A C A1
E e H
L
1.27(TYP)
B
L
l
8 LEAD PLASTIC DIP (unit: mm)
D
SYMBOL A1
E1
MIN 0.381 2.92 0.35 0.20 9.01 7.62 6.09 -- 2.92
MAX -- 4.96 0.56 0.36 10.16 8.26 7.12 10.92 3.81
A2 b C
E
D E E1
C
A2 A1
L
e
eB
2.54 (TYP)
b
e
eB L
10

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