BA9700A / BA9700AF / BA9700AFV

Regulator ICs

Switching regulator for DC / DC

Converters

BA9700A / BA9700AF / BA9700AFV

The BA9700A, BA9700AF and BA9700AFV are switching regulators that use a pulse width modulation (PWM) system.

They use a transistor switch to stabilize the output voltage.

By the use of the transistor, power loss is decreased, fluctuation efficiency is improved, and the circuit is made more

compact and single.

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!Features

1) Output voltage can step up, step down, or invert at an

arbitrary level.

2) Low current consumption. (typically 1.7mA)

3) Wide oscillation frequency range.

(typically 2.8k ~ 470kHz)

4) Built-in reference voltage current. (typically 2.57V)

5) Operates at low voltage. (minimally 3.55V)

6) Dead time controller restricts operation when

overloaded.

7) Power switch can isolate all circuits in the IC.

8) Best suited for battery operated equipment.

9) Compact 14-pin SSOP package (BA9700AFV).

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!Block diagram

30k

30k

Error

Amp

PWM

Comparator

NON

INVERT

INPUT

INVERT

INPUT

POWER

SW

N. C.

FEED

BACK

D - TIME

CONT

N. C.

OUT

GND

14

13

12

11

10

9

8

123

456

7

+

−

Voltage

Regulator

Triangle

Oscillator

BA9700A

BA9700AF

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!

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!Absolute maximum ratings

(Ta = 25

°C)

Parameter

Symbol

Limits

Unit

24

V

BA9700A

Pd

600

mW

BA9700AF

BA9700AFV

Topr

-20~+80

°C

Tstg

-55~+150

°C

Power supply voltage

Power

dissipation

Operating temperature

Storage temperature