NJU7630M - New Japan Radio Co., Ltd.

NJU7630

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Ver.2012-08-03

PWM control Step-Down switching regulator IC

■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE

■ FEATURES ■ PRODUCT VARIATION

● PWM switching control

● Operating Voltage 2.2V to 8V

● Wide Oscillator Range 300kHz to 1MHz

● Maximum Duty Cycle 100%

● Quiescent Current 800µA 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 : MSOP8 (TVSP8)*

*MEET JEDEC MO-187-DA / THIN TYPE

■ PIN CONFIGURATION

The NJU7630 is a low voltage operation high-speed switching

regulator control IC for step-down converter, with PWM control.

It incorporates a totem pole output, which can drive an external

MOS-FET easily. The NJU7630 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. It is available in

8-lead DMP and MSOP (TVSP) packages. 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

NJU7630M

NJU7630RB1

1 8

2 7

3 6

4 5

Standby Function

NJU7632 NJU7631

NJU7630 NJU7640

Over Current Protection

PWM Control

PWM/PFM

Light Load to

Efficiency

Constant Current Control

NJU7650

NJU7630RB1

(MSOP8 (TVSP8))

NJU7630M

(DMP8)

NJU7630

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■ BLOCK DIAGRAM

Buffer

0.5V

OSC

1V

0.5

RT

A

2kΩ

2µA

UVLO

Soft Start

Vref

1V

0.8V

0.2V

OUT

GNDRT DTC

RT

SCP

IN-

FB

V

+

PW M

SCP

ER⋅AMP

Latch

NJU7630

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■ 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 DMP8 :300

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 – %

NJU7630

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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 25 55 95 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 Comparate 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

NJU7630

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■ 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

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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)

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)

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■ TYPICAL CHARACTERISTICS

(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

0

2

4

6

8

10

12

14

-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 IOM- (mA)

Error Amplifier Block

Output Sink Current vs. Temperature

(VFB=1V, VIN-=1.1V)

V+=1.95V, 3.3V, 8V

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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)

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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.