NJU7632
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1
-
Ver.2012-08-03
Step-Down switching regulator IC with standby function
■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE
■ FEATURES ■ PRODUCT VARIATION
● PWM switching control
● Standby Function
● Operating Voltage 2.2V to 8V
● Wide Oscillator Range 300kHz to 1MHz
● Maximum Duty Cycle 100%
● Quiescent Current Operating :800µA typ.
Standby :1µA max.
● Soft-Start Function Internal :16ms typ. or adjustable
● Dead Time Control
● Timer Latch for Short Circuit Protection
● C-MOS Technology ** Planning
● Package Outline NJU7632RB1 : MSOP8 (TVSP8)*
*MEET JEDEC MO-187-DA / THIN TYPE
■ PIN CONFIGURATION
The NJU7632 is a low voltage operation high-speed
switching regulator control IC for step-down converter, with a
standby function. It incorporates a totem pole output, which
can drive an external MOS-FET easily. The NJU7632 also has
a soft-start function, dead time control and timer latch for short
circuit protection and their times are all adjustable with external
parts. Further the internal standby function minimize the
current during non-active condition. It is available in a small
and thin 8-lead MSOP (TVSP) package, and it is suitable for
battery powered applications.
PIN FUNCTION
1. OUT
2. V+
3. FB
4. IN-
5. SCP
6. DTC
7. RT
8. GND
NJU7632RB1
1 8
2 7
3 6
4 5
NJU7632
NJU763x**
NJU7630
Standby Function
Standby Terminal
PWM Control
NJU7632RB1
(MSOP8 (TVSP8))
NJU7632
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■ BLOCK DIAGRAM
Buffer
0.5V
OSC
1V
0.5
RT
A
2kΩ
2µA
UVLO
Soft Start
Vref
1V
1V
0.8V
0.2V
OUT
GNDDTC
SCP
IN-
FB
V
+
PW M
SCP
ER⋅AMP
Latch
Standby
ON/OFF
RT
RTRP
V
+
ON/OFF
High: ON
Low : OFF (Standby)
NJU7632
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Ver.2012-08-03
■ ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Supply Voltage V+ +9 V
Output Pin Current IO ±50 mA
Power Dissipation PD MSOP8 (TVSP8) :320 mW
Operating Temperature Range TOPR -40 to +85 °C
Storage Temperature Range TSTG -40 to +125 °C
■ RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER SYMBOL MIN. TYP. MAX. UNIT
Operating Voltage V+ 2.2 – 8 V
Oscillator Timing Resistor RT 30 47 120 kΩ
Oscillation Frequency fOSC 300 700 1,000 kHz
■ ELECTRICAL CHARACTERISTICS (V
+=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Under Voltage Lockout Block
ON Threshold Voltage VT_ON V
+= L → H 1.9 2.0 2.1 V
OFF Threshold Voltage VT_OFF V
+= H → L 1.8 1.9 2.0 V
Hysteresis Voltage VHYS 60 100 – mV
Soft Start Block
Soft Start Time TSS V
T_ON → Duty=80% 8 16 24 ms
Short Circuit Protection Block
Input Threshold Voltage VT_PC FB Pin 0.95 1.00 1.05 V
Charge Current ICHG V
SCP=0V 1.5 2 2.5
µA
Latch Mode
ON Threshold Voltage VT_LA SCP Pin 0.95 1.00 1.05 V
Latch Mode
OFF Threshold Voltage VT_LAOFF SCP Pin 0.2 0.45 0.7 V
Oscillator Block
RT Pin Voltage VRT -5% 0.5 +5% V
Oscillation Frequency fOSC 630 700 770 kHz
Oscillate Supply Voltage
Fluctuations fDV V
+=2.2V to 8V – 1 – %
Oscillate Temperature
Fluctuations fDT Ta=- 40°C to +85°C – 3 – %
Standby RT Terminal
Resistance RT_STB – 2 – MΩ
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■ ELECTRICAL CHARACTERISTICS (V
+=3.3V, RT=47kΩ, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Error Amplifier Block
Reference Voltage VB -1.0% 1.00 +1.0% V
Input Bias Current IB -0.1 – 0.1
µA
Open Loop Gain AV – 80 – dB
Gain Bandwidth Product GB – 1 – MHz
IOM+_1 V
FB=1V, VIN-=0.9V 20 45 70 mA
Output Source Current IOM+_2 V
FB=1V, VIN-=0.9V, V+=2.2V 4 9 16 mA
Output Sink Current IOM- V
FB=1V, VIN-=1.1V 0.10 0.16 0.22 mA
PWM Complete Block
VT_0 Duty=0% 0.16 0.22 0.28 V
Input Threshold Voltage VT_50 Duty=50% 0.44 0.5 0.56 V
MAXDUTY_1 V
FB=0.9V 100 – – %
Maximum Duty Cycle MAXDUTY_2 V
FB=0.9V, RDTC=47kΩ 40 50 60 %
Output Block
Output High Level
ON Resistance ROH I
O=-20mA – 10 20 Ω
Output Low Level
ON Resistance ROL I
O=+20mA – 5 10 Ω
General Characteristics
Quiescent Current IDD R
L=Non Load – 800 1200 µA
Standby Quiescent Current IDD_STB R
T=Open – – 1.0
µA
NJU7632
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Ver.2012-08-03
■ TYPICAL APPLICATIONS
Step-Down Converter
SCP
VIN VOUT
CSCP
1
FET
SBD
2
3
4 5
6
7
8
RDTC
CS
IN-
FB
V
+
DTC
RT
GNDOUT
RT
COUT
CIN R2
R1
CNF
RNF
C
L
NJU7632
ON/OFF
High: ON
Low : OFF
(Standby)
RP
NJU7632
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■TYPICAL CHARACTERISTICS
100
1000
10 100
Oscillation Frequency fOSC (kHz)
Oscillation Frequency vs. Timing Resistance
(V+=3.3V, Ta=25
oC)
Timing Resistance R
T (kΩ)
660
680
700
720
740
0246810
Oscillation Frequency fosc (kHz)
Operating Voltage V
+ (V)
Oscillation Frequency vs. Operating Voltage
(RT=47kΩ, Ta=25oC)
0
20
40
60
80
100
0 20406080100
Duty Cycle MAXDUTY (%)
Dead Time Control Resistance R
DTC (kΩ)
Duty Cycle vs. R
DTC
(V+=3.3V, RT=47kΩ, Ta=25oC)
0.996
0.998
1
1.002
1.004
0246810
Reference Voltage VB (V)
Operating Voltage V
+ (V)
Reference Voltage vs. Operating Voltage
(Ta=25oC)
(V+=3.3V, Gain=40dB, Ta=25
oC)
0
15
30
45
60
0
45
90
135
180
0.1 1 10 100 1000 10000
Error Amplifier Block
Voltage Gain, Phase vs. Frequency
Phase Φ (deg)
Frequency f (kHz)
Voltage Gain Av (dB)
Phase
Gain
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■ TYPICAL CHARACTERISTICS
0
200
400
600
800
1000
1200
1400
0246810
Quiescent Current IDD (µA)
Operating Voltage V
+ (V)
Quiescent Current vs. Operating Voltage
(RT=47kΩ, RL=Non Load, Ta=25
oC)
0
0.2
0.4
0.6
0.8
1
0246810
Standby Current IDD_STB (nA)
Operating Voltage V
+ (V)
Standby Current vs. Operating Voltage
(RT=Open, Ta=25
oC)
0
2
4
6
8
10
12
14
16
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Output High Level ON Resistance
ROH (Ω)
Output Block
Output High Level ON Resistance
vs. Temperature (Io=-20mA)
V+=3.3V
V+=1.95V
V+=8V
0
2
4
6
8
10
12
14
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Output Low Level ON Resistance
ROL (Ω)
Output Block
Output Low Level ON Resistance
vs. Temperature (Io=+20mA)
V+=3.3V
V+=1.95V
V+=8V
1
10
100
1000
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Output Source Current I
OM+ (mA)
Error Amplifier Block
Output Source Current vs. Temperature
(VFB=1V, VIN-=0.9V)
V+=3.3V
V+=1.95V
V+=8V
0
0.05
0.1
0.15
0.2
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Output Sink Current I
OM- (mA)
Error Amplifier Block
Output Sink Current vs. Temperature
(VFB=1V, VIN-=1.1V)
V+=1.95V, 3.3V, 8V
NJU7632
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■ TYPICAL CHARACTERISTICS
8
10
12
14
16
18
20
22
24
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Soft Start Time Tss (ms)
Soft Start Time vs. Temperature
(V+=3.3V)
0.99
0.995
1
1.005
1.01
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Reference Voltage VB (V)
Reference Voltage vs. Temperature
(V+=3.3V)
640
660
680
700
720
740
760
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Oscillator Frequency fOSC (kHz)
Oscillator Frequency vs. Temperature
(V+=3.3V, RT=47kΩ)
1.86
1.9
1.94
1.98
2.02
2.06
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Threshold Voltage (V)
Under Voltage Lockout Block
vs. Temperature
VT_OFF
VT_ON
0
200
400
600
800
1000
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Quiescent Current IDD (µA)
Quiescent Current vs. Temperature
(V+=3.3V, RT=47kΩ)
0
0.2
0.4
0.6
0.8
1
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Standby Current IDD_STB (µA)
Standby Current vs. Temperature
(V+=3.3V, RT=Open)
NJU7632
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Ver.2012-08-03
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.
[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.
