NJU7261U30 - New Japan Radio Co., Ltd.

NJU7261 Series

-1-

Ver.2003-07-18

PRELIMINAR

Y

C-MOS STEP-UP SWITCHING REGULATOR

■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE

The NJU7261 series is a C-MOS step-up switching regulator

which contains accurate voltage reference, error amplifier, CR

oscillator, control circuit, switching transistor, diode and resistor.

The stand-by function is effective for low power consumption.

The regulation voltage is fixed by internal circuits and the following

line-up of different output voltages version are available.

This series is suitable for portable equipment's or battery operated

items because of its small packaged outline, low operating voltage

and current.

■ FEATURES ■ PIN CONFIGULATION

• Low Operating Voltage (1.0V min.)

• Low Operating Current (5.0µA typ. / VOUT = 3.0V)

• Low Stand-by Current (0.2µA max. / VOUT = 3.0V)

• High Precision Output Voltage (±3% max.)

• Wide Operating Voltage Range

• Stand-by Function

• CR Oscillator On-chip

• Diode On-chip

• Package Outline SOT89-5

• C-MOS Technology

■ LINE-UP ■ EQUIVALENT CIRCUIT

Output Voltage (V) Line-Up

3.0 NJU7261U30

3.3 NJU7261U33

4.5 NJU7261U45

5.0 NJU7261U50

■ TERMINAL DESCRIPTION

No. Term. Name I/O FUNCTION

1 CONT I External Inductor Connect Terminal

2 GND POWER Power Source (GND)

3 STB I

Strobe Terminal : "H" or OPEN···Normal Operation (step-up)

" L" ···Standp-By Operation

4 VIN POWER Power Source (+)

5 VOUT O Step-up Output Terminal

NJU7261UX

NJU7261 Series

- 2 - Ver.2003-07-18

■ ABSOLUTE MAXIMUM RATINGS (Ta = 25ºC)

PARAMETER SYMBOL RATINGS UNIT

Input Voltage VIN 10 V

CONT Input Voltage VCONT GND-0.3 ≤ VCONT ≤ 10 V

Strobe Input Voltage VSTB GND-0.3 ≤ VSTB ≤ VIN V

Output Voltage VOUT GND-0.3 ≤ VOUT ≤ 10 V

Power Dissipation PD 300 mW

Operating Temperature Range Topr -25 to + 75 ºC

Storage Temperature Range Tstg -40 to +125 ºC

Note1) When a coil used. This IC of VCONT possible over the absolute maximum ratings. Consequently please conduct

enough to test.

Note2) The CONT input voltage (VCONT) should be inspected at the real application circuit, as some kinds of coils make

the CONT input voltage exceed the Absolute Maximum Rating of the VCONT.

■ ELECTRICAL CHARACTERISTICS

+3.0V Version (T

a = 25°C)

NORM

PARAMETER SYMBOL CONDITION

MIN. TYP. MAX.

UNIT

MEASUREMENT

CIRCUIT

Input Voltage VIN - - 5.0 V 1

Start Voltage VSTART NO LOAD - - 1.0 V 1

Oscillator Freq. fOSC V

IN = 1.5V 20 30 50 kHz 2

Output Voltage VOUT V

IN = 1.5V, IOUT = 20mA 2.91 3.0 3.09 V 1

Input Stability ∆VOUT1 VIN = 1.5V to 2.0V

IOUT = 20mA - 30 100 mV 1

Load Stability ∆VOUT2 VIN = 1.5V

IOUT = 10µA to 25mA - 30 100 mV 1

Operating Current ISS V

IN = VSTB = 1.5V, NO LOAD - 5.0 10 µA 3

Stand-by Current IQ VIN = 1.5V

VSTB = 0V, NO LOAD - - 0.2 µA 4

Switching Current ISI V

DS = 0.2V - 250 - mA -

H level VSTBH V

IN = 1.5V 1.0 - - V 5

STB Terminal

Input Voltage L level VSTBL V

IN = 1.5V - - 0.4 V 5

ISTBH1 V

IN = 1.5V, VSTB = 1.0V - 15 30 µA 6

H level ISTBH2 V

IN = 1.5V, VSTB = 1.5V - 0.1 - µA 6

ISTBL1 V

IN = 1.5V, VSTB = 0.4V - 15 30 µA 6

STB Terminal

Input Current

L level ISTBL2 V

IN = 1.5V, VSTB = 0V - 0.1 - µA 6

NJU7261 Series

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3

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Ver.2003-07-18

+3.3V Version (T

a = 25°C)

NORM

PARAMETER SYMBOL CONDITION

MIN. TYP. MAX.

UNIT

MEASUREMENT

CIRCUIT

Input Voltage VIN - - 5.0 V 1

Start Voltage VSTART NO LOAD - - 1.0 V 1

Oscillator Freq. fOSC V

IN = 1.5V 20 30 50 kHz 2

Output Voltage VOUT V

IN = 1.5V, IOUT = 20mA 3.20 3.30 3.40 V 1

Input Stability ∆VOUT1 VIN = 1.5V to 3.0V

IOUT = 20mA - 30 100 mV 1

Load Stability ∆VOUT2 VIN = 1.5V

IOUT = 10µA to 25mA - 30 100 mV 1

Operating Current ISS V

IN = VSTB = 1.5V, NO LOAD - 5 10 µA 3

Stand-by Current IQ VIN = 1.5V

VSTB = 0V, NO LOAD - - 0.2 µA 4

Switching Current ISI V

DS = 0.2V - 250 - mA -

H level VSTBH V

IN = 1.5V 1.0 - - V 5

STB Terminal

Input Voltage L level VSTBL V

IN = 1.5V - - 0.4 V 5

ISTBH1 V

IN = 1.5V, VSTB = 1.0V - 15 30 µA 6

H level ISTBH2 V

IN = 1.5V, VSTB = 1.5V - 0.1 - µA 6

ISTBL1 V

IN = 1.5V, VSTB = 0.4V - 15 30 µA 6

STB Terminal

Input Current

L level ISTBL2 V

IN = 1.5V, VSTB = 0V - 0.1 - µA 6

+4.5V Version (T

a = 25°C)

NORM

PARAMETER SYMBOL CONDITION

MIN. TYP. MAX.

UNIT

MEASUREMENT

CIRCUIT

Input Voltage VIN - - 4.5 V 1

Start Voltage VSTART NO LOAD - - 1.0 V 1

Oscillator Freq. fOSC V

IN = 3.0V 20 30 50 kHz 2

Output Voltage VOUT V

IN = 3.0V, IOUT = 20mA 4.36 4.50 4.64 V 1

Input Stability ∆VOUT1 VIN = 2.0V to 3.0V

IOUT = 20mA - 30 100 mV 1

Load Stability ∆VOUT2 VIN = 3.0V

IOUT = 10µA to 25mA - 30 100 mV 1

Operating Current ISS V

IN = VSTB = 3.0V, NO LOAD - 5 15 µA 3

Stand-by Current IQ VIN = 3.0V

VSTB = 0V, NO LOAD - - 0.2 µA 4

Switching Current ISI V

DS = 0.2V - 250 - mA -

H level VSTBH V

IN = 3.0V 2.4 - - V 5

STB Terminal

Input Voltage L level VSTBL V

IN = 3.0V - - 0.4 V 5

ISTBH1 V

IN = 3.0V, VSTB = 2.4V - 50 100 µA 6

H level ISTBH2 V

IN = 3.0V, VSTB = 3.0V - 0.1 - µA 6

ISTBL1 V

IN = 3.0V, VSTB = 0.4V - 50 100 µA 6

STB Terminal

Input Current

L level ISTBL2 V

IN = 3.0V, VSTB = 0V - 0.1 - µA 6

NJU7261 Series

- 4 - Ver.2003-07-18

+5.0V Version (T

a = 25°C)

NORM

PARAMETER SYMBOL CONDITION

MIN. TYP. MAX.

UNIT

MEASUREMENT

CIRCUIT

Input Voltage VIN - - 5.0 V 1

Start Voltage VSTART NO LOAD - - 1.0 V 1

Oscillator Freq. fOSC V

IN = 3.0V 20 30 50 kHz 2

Output Voltage VOUT V

IN = 3.0V, IOUT = 20mA 4.85 5.0 5.15 V 1

Input Stability ∆VOUT1 VIN = 2.0V to 3.0V

IOUT = 20mA - 30 100 mV 1

Load Stability ∆VOUT2 VIN = 3.0V

IOUT = 10µA to 25mA - 30 100 mV 1

Operating Current ISS V

IN = VSTB = 3.0V, NO LOAD - 5 15 µA 3

Stand-by Current IQ VIN = 3.0V

VSTB = 0V, NO LOAD - - 0.2 µA 4

Switching Current ISI V

DS = 0.2V - 250 - mA -

H level VSTBH V

IN = 3.0V 2.4 - - V 5

STB Terminal

Input Voltage L level VSTBL V

IN = 3.0V - - 0.4 V 5

ISTBH1 V

IN = 3.0V, VSTB = 2.4V - 50 100 µA 6

H level ISTBH2 V

IN = 3.0V, VSTB = 3.0V - 0.1 - µA 6

ISTBL1 V

IN = 3.0V, VSTB = 0.4V - 50 100 µA 6

STB Terminal

Input Current

L level ISTBL2 V

IN = 3.0V, VSTB = 0V - 0.1 - µA 6

NJU7261 Series

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5

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Ver.2003-07-18

■ MEASUREMENT CIRCUIT 1

(1)

External Diode Type : "D1NS4" provided by SHINDENGEN

(I

F = 1A, VF = 0.55V)

(2)

(3)

I

SS = I1 + l2 x

2

OUT

V

Under the condition of V2 =VOUT + 1.0V

NJU7261 Series

-

6

- Ver.2003-07-18

■ MEASUREMENT CIRCUIT 2

(4)

(5)

(6)

NJU7261 Series

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Ver.2003-07-18

■ APPLICATION CIRCUIT

NJU7261 Series

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8

- Ver.2003-07-18

■ TYPICAL CHARACTERISTIC

Start Voltage vs. Temperature Start Voltage vs. Temperature

Internal Oscillator Operation : External D1NS4 Internal Oscillator Operation : External D1NS4

Oscillation Frequency vs. Temperature Oscillation Frequency vs. Temperature

[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.