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BA9700 Datasheet

  • BA9700

  • Switching regulator for DC / DC Converters

  • 7頁(yè)

  • ROHM

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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.
!
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)
!
Block diagram
NON
INVERT
INPUT
14
1/2 V
ref
13
INVERT
INPUT
12
V
ref
11
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).
POWER
SW
10
N. C.
9
V
CC
8
+
鈭?/div>
Error
Amp
30k
30k
V
ref
Voltage
Regulator
BA9700A
BA9700AF
PWM
Comparator
Triangle
Oscillator
1
D - TIME
CONT
2
R
T
3
C
T
4
FEED
BACK
5
OUT
6
N. C.
7
GND
!
Absolute maximum ratings
(Ta = 25擄C)
Parameter
Power supply voltage
Symbol
V
CC
Limits
24
600
*
1
350
*
2
350
*
3
Unit
V
BA9700A
Power
dissipation
BA9700AF
BA9700AFV
Pd
mW
Operating temperature
Storage temperature
Topr
Tstg
-20~+80
-55~+150
擄C
擄C
*
1 BA9700A: Reduced by 4.8 mW for each increase in Ta of
1藲C over 25藲C.
*
2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of
1藲C over 25藲C.
*
3 BA9700AFV : Reduced by 3.5 mW for each increase in Ta of
1藲C over 25藲C.
*
2,
*
3 When mounted on a 5.0麓5.0麓1.6 mm glass epoxy board.

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