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NJU7630
PWM control Step-Down switching regulator IC
GENERAL DESCRIPTION NJU7630 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
NJU7630M
NJU7630RB1
FEATURES PWM switching control Operating Voltage 2.2V to 8V Wide Oscillator Range 300kHz to 1MHz Maximum Duty Cycle 100% 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 NJU7630M : DMP8 NJU7630RB1 : TVSP8
PRODUCT VARIATION NJU7631*
PWM/PFM Light Load to Efficiency
NJU7632*
Standby Function Step-up
NJU7630
PWM Control
NJU7600
* Under Development
PIN CONFIGURATION
1 2 3 4 8 7 6 5
NJU7630M NJU7630RB1
PIN FUNCTION 1. OUT 2. V+ 3. FB 4. IN5. SCP 6. DTC 7. RT 8. GND
Ver.2005-03-01
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NJU7630
BLOCK DIAGRAM
V+ FB
ERAMP 0.8V
IN1V Vref 0.2V
Soft Start UVLO Latch PWM
SCP
2A SCP OSC 2k 0.5 1V 1V RT A 0.5V
Buffer
OUT
DTC
RT RT
GND
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Ver.2005-03-01
NJU7630
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-
NJU7630
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 0.44 100 40 0.22 0.5 - 50 0.28 0.56 - 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
-1.0% -0.1 - - 25 4 0.10
1.00 - 80 1 55 9 0.16
+1.0% 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
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Ver.2005-03-01
NJU7630
TYPICAL APPLICATIONS Step-Down Converter
FET VIN CIN SBD COUT R2
L
VOUT
NJU7630
1
R1 GND RT DTC SCP
8
OUT V
+
2
7
C
3
RT RDTC CS
FB IN-
6
CNF RNF
4 5
CSCP
Ver.2005-03-01
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NJU7630
TYPICAL CHARACTERISTICS
Oscillation Frequency vs. Timing Resistance
Oscillation Frequency fosc (kHz)
Oscillation Frequency fOSC (kHz)
1000
(V+=3.3V, Ta=25oC)
Oscillation Frequency vs. Operating Voltage 740 720 700 680 660 (R =47k, Ta=25oC)
T
100 10
100 Timing Resistance R (k) T
Duty Cycle vs. R
+
0
2 4 6 8 + Operating Voltage V (V)
10
DTC o
Reference Voltage vs. Operating Voltage 1.004 Reference Voltage VB (V) 1.002 1 0.998 0.996 (V+=3.3V, Ta=25 C)
o
100 (%) 80 60 40 20 0
(V =3.3V, R =47k, Ta=25 C)
T
Duty Cycle M D
AX
UTY
0 20 40 60 80 100 Dead Time Control Resistance R (k) DTC
0
2 4 6 8 + Operating Voltage V (V)
10
Quiescent Current vs. Operating Voltage 1400 Quiescent Current IDD (uA) 1200 1000 800 600 400 200 0 0 2 4 6 8 + Operating Voltage V (V) 10 (R =47k, R =Non Load, Ta=25 C)
T L o
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Ver.2005-03-01
NJU7630
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
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NJU7630
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
2.06 Threshold Voltage (V) 2.02 1.98 1.94 1.9 1.86 -50
Under Voltage Lockout Block vs. Temperature
VT_ON
V
T_OFF
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
Quiescent Current vs. Temperature 1000 Quiescent Current IDD (uA) 800 600 400 200 0 -50 (V+=3.3V, R =47k)
T
-25 0 25 50 75 100 125 Ambient Temperature Ta (oC)
-8-
Ver.2005-03-01
NJU7630 MEMO
[CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
Ver.2005-03-01
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