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NJU7600
PWM control Step-Up / Flyback switching regulator IC
GENERAL DESCRIPTION NJU7600 is a high speed low voltage operation switching regulator control IC. It features a totem pole driver that can directly drive an external MOS-FET. Internal soft-start function, Dead time control and timer latch function are included, requiring no external components. All parameters can be optimized by additional external components for design flexibility. PACKAGE OUTLINE
NJU7600M
NJU7600RB1
FEATURES PWM switching control Operating Voltage 2.2V to 8V Wide Oscillator Range 300kHz to 1MHz Maximum Duty Cycle 90% typ. Quiescent Current 800A typ. Soft-Start Function Internal : 16ms typ. or adjustable Dead Time Control Timer Latch for Short Circuit Protection C-MOS Technology Package Outline NJU7600M : DMP8 NJU7600RB1 : TVSP8
PRODUCT VARIATION NJU7601*
PWM/PFM Light Load to Efficiency
NJU7602*
Standby Function Over Current Protection
NJU7600
PWM Control
NJU7610*
* Under Development
PIN CONFIGURATION
1 2 3 4 8 7 6 5
NJU7600M NJU7600RB1
PIN FUNCTION 1. V+ 2. FB 3. IN4. SCP 5. DTC 6. RT 7. GND 8. OUT
Ver.2005-03-01
-1-
NJU7600
BLOCK DIAGRAM
V FB
+
ERAMP
0.8V
IN1V Vref 0.2V
Soft Start UVLO Latch PWM
SCP
2uA SCP OSC 2k 0.5 A RT 0.5V 0.74V
Buffer
OUT
1V 1V
DTC
RT
GND
-2-
Ver.2005-03-01
NJU7600
ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL Supply Voltage V+ Output Pin Current IO Power Dissipation PD Operating Temperature Range Storage Temperature Range TOPR TSTG
MAXIMUM RATINGS +9 50 DMP8 :300 TVSP8 :320 -40 ~ +85 -40 ~ +125
UNIT V mA mW C C
RECOMMENDED OPERATING CONDITIONS (Ta=25C) PARAMETER SYMBOL MIN. Operating Voltage V+ 2.2 Oscillator Timing Resistor RT 30 Oscillation Frequency fOSC 300
TYP. - 47 700
MAX. 8 120 1,000
UNIT V k kHz
ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47k, Ta=25C) PARAMETER Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Soft Start Block Soft Start Time Short Circuit Protection Block Input Threshold Voltage Charge Current Latch Mode ON Threshold Voltage Latch Mode OFF Threshold Voltage Oscillator Block RT Pin Voltage Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
VT_ON VT_OFF VHYS
V+= L H V+= H L
1.9 1.8 60
2.0 1.9 100
2.1 2.0 -
V V mV
TSS
VT_ON Duty=80%
8
16
24
ms
VT_PC ICHG VT_LA VT_LAOFF
FB Pin VSCP=0V SCP Pin SCP Pin
0.95 1.5 0.95 0.2
1.00 2 1.00 0.45
1.05 2.5 1.05 0.7
V A V V
VRT fOSC fDV fDT V+=2.2V ~ 8V Ta=-40C ~ +85C
-5% 630 - -
0.5 700 1 3
+5% 770 - -
V kHz % %
Ver.2005-03-01
-3-
NJU7600
ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47k, Ta=25C) PARAMETER Error Amplifier Block Reference Voltage Input Bias Current Open Loop Gain Gain Bandwidth Product Output Source Current Output Sink Current PWM Comparate Block Input Threshold Voltage Maximum Duty Cycle Output Block Output High Level ON Resistance Output Low Level ON Resistance General Characteristics Quiescent Current VT_0 VT_50 MAXDUTY_1 MAXDUTY_2 Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47k 0.16 0.44 85 40 0.22 0.5 90 50 0.28 0.56 95 60 V V % % SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
VB IB AV GB IOM+_1 IOM+_2 IOMVFB=1V, VIN-=0.9V VFB=1V, VIN-=0.9V, V+=2.2V VFB=1V, VIN-=1.1V
-1.5% -0.1 - - 25 4 0.10
1.00 - 80 1 55 9 0.16
+1.5% 0.1 - - 95 16 0.22
V A dB MHz mA mA mA
ROH ROL
IO=-20mA IO=+20mA
- -
10 5
20 10

IDD
RL=Non Load
-
800
1200
A
-4-
Ver.2005-03-01
NJU7600
TYPICAL APPLICATIONS Step-Up Converter
L
V
+
SBD VOUT
CIN
R2 FET COUT R1
C
1
NJU7600 V
+
OUT GND RT DTC
8
2
CNF RNF
3
FB INSCP
7
RT
6
4
5
CSCP
RDTC
CS
Flyback Converter
V
+
T
CIN
SBD VOUT R2
C
1
NJU7600 V
+
FET OUT GND RT DTC
8
COUT R1
CNF RNF
2
FB INSCP
7
RT
3 6
4
5
CSCP
RDTC
CS
Ver.2005-03-01
-5-
NJU7600
TYPICAL CHARACTERISTICS
Oscillation Frequency vs. Timing Resistance Oscillation Frequency fOSC (kHz) 1000 (V+=3.3V, Ta=25oC)
Maximum Duty Cycle MD (%) Maximum Duty Cycle vs. Oscillator Frequency 100 95 90 85 80 100 Oscillator Frequency f (kHz) OSC
Duty Cycle vs. R
+
(V =3.3V, Ta=25 C)
+
o
100 10
AX
UTY_1
100 Timing Resistance R (k) T
1000
Oscillation Frequency vs. Operating Voltage Oscillation Frequency fosc (kHz) 740 720 700 680 660 (R =47k, Ta=25oC)
T
DTC o
100 Duty Cycle MAXDUTY (%) 80 60 40 20 0
(V =3.3V, R =47k, Ta=25 C)
T
0
2 4 6 8 + Operating Voltage V (V)
10
0 20 40 60 80 100 Dead Time Control Resistance R (k) DTC Quiescent Current vs. Operating Voltage
Reference Voltage vs. Operating Voltage 1.004 Reference Voltage VB (V) 1.002 1 0.998 0.996 (V =3.3V, Ta=25 C) Quiescent Current IDD (uA)
+ o
1400 1200 1000 800 600 400 200 0 0
(R =47k, R =Non Load, Ta=25 C)
T L
o
0
2 4 6 8 + Operating Voltage V (V)
10
2 4 6 8 + Operating Voltage V (V)
10
-6-
Ver.2005-03-01
NJU7600
TYPICAL CHARACTERISTICS
Error Amplifier Block Voltage Gain, Phase vs. Frequency + o (V =3.3V, Gain=40dB, Ta=25 C)
60 Voltage Gain Av (dB) 45
180 135 90 45
Gain 30 15 0 0.1
1
10 100 1000 Frequency f (kHz)
0 10000
Output High Level ON Resistance R ()
12 10 8 6 4 2 0 -50
V =1.95V
+
Output Low Level ON Resistance ROL ()
14
Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA)
14 12 10 8 6 4 2 0 -50
Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA)
Phase (deg)
Phase
V+=1.95V
V+=3.3V
V+=3.3V
OH
V+=8V -25 0 25 50 75 100 125 Ambient Temperature Ta (oC)
V+=8V -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
Output Source Current IOM+ (mA)
V+=8V 100 V+=3.3V 10 V+=1.95V 1 -50
Output Sink Current IOM- (mA)
1000
Error Amplifier Block Output Source Current vs. Temperature (VFB=1V, VIN-=0.9V)
0.2 0.15 0.1 0.05 0 -50
Error Amplifier Block Output Sink Current vs. Temperature (VFB=1V, VIN-=1.1V)
V+=1.95V, 3.3V, 8V
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
Ver.2005-03-01
-7-
NJU7600
TYPICAL CHARACTERISTICS
Soft Start Time vs. Temperature 24 Soft Start Time Tss (ms) 22 20 18 16 14 12 10 8 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) (V =3.3V) Reference Voltage VB (V)
+
Reference Voltage vs. Temperature 1.01 1.005 1 (V+=3.3V)
0.995 0.99 -50
-25 0 25 50 75 100 125 Ambient Temperature Ta (oC)
Oscillator Frequency vs. Temperature Oscillator Frequency fOSC (kHz) 760 740 720 700 680 660 640 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) (V =3.3V, R =47k)
T +
Muximum Duty Cycle vs. Temperature 100 Muximum Duty Cycle MD (%) 90 80 70 60 50 40 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) MAX DUTY_2 MAX DUTY_1 (V+=3.3V)
AX
UTY
2.06 Threshold Voltage (V) 2.02 1.98 1.94 1.9 1.86 -50
Under Voltage Lockout Block vs. Temperature Quiescent Current IDD (uA)
Quiescent Current vs. Temperature 1000 800 600 400 200 0 -50 (V+=3.3V, R =47k)
T
VT_ON
V
T_OFF
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
-25 0 25 50 75 100 125 Ambient Temperature Ta (oC)
-8-
Ver.2005-03-01

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