BA9700AF View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
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BA9700AF Datasheet PDF : 7 Pages
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Regulator ICs
BA9700A / BA9700AF / BA9700AFV
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.
!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).
!Block diagram
NON
INVERT
INVERT
POWER
INPUT 1/2 Vref
INPUT
Vref
SW
N. C.
VCC
14
13
12
11
10
9
8
+−
Error
Amp
Triangle
Oscillator
30k
30k
PWM
Comparator
Voltage
Regulator
Vref
BA9700A
BA9700AF
1
2
D - TIME
RT
CONT
3
4
5
6
7
CT
FEED
OUT
N. C.
GND
BACK
!Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
VCC
BA9700A
Power
dissipation
BA9700AF
Pd
BA9700AFV
24
V
600 *1
350 *2
mW
350 *3
Operating temperature
Topr
-20~+80
°C
Storage temperature
Tstg
-55~+150
°C
*1 BA9700A: Reduced by 4.8 mW for each increase in Ta of 1˚C over 25˚C.
*2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of 1˚C over 25˚C.
*3 BA9700AFV : Reduced by 3.5 mW for each increase in Ta of 1˚C over 25˚C.
* *2, 3 When mounted on a 5.0´5.0´1.6 mm glass epoxy board.
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