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PDF BA9700A Data sheet ( Hoja de datos )
| Número de pieza | BA9700A | |
| Descripción | Switching regulator for DC / DC Converters | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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
INPUT
14
1/2 Vref
13
INVERT
INPUT
12
Vref
11
POWER
SW
10
N. C.
9
VCC
8
+−
Error
Amp
Triangle
Oscillator
30k
30k
PWM
Comparator
Voltage
Regulator
Vref
BA9700A
BA9700AF
1
D - TIME
CONT
2
RT
34 5 6 7
CT
FEED
OUT
N. C.
GND
BACK
!Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage
Power
dissipation
BA9700A
BA9700AF
BA9700AFV
VCC
Pd
24
600 *1
350 *2
350 *3
Operating temperature
Topr
-20~+80
Storage temperature
Tstg -55~+150
*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.
Unit
V
mW
°C
°C
1 page  
Regulator ICs
BA9700A / BA9700AF / BA9700AFV
!Basic application board patterns and component arrangemrnts
VIN
GND
C2
BA9700A
+ SW
Q1
B
C
E
D
()(
+ R1
L+
)
+
C5
VOUT
GND
+ C6
BA9700A - 1
Fig.5 Step-down converter
VIN
GND
C2
SW
+
C7
BA9700A
R8 R5
C4
+
R1
R3
Q1
B
C
E
L
C5
+
D1
VOUT
GND
BA9700A - 2
Fig.6 Inverting converter (BA9700A)
VIN
GND
C2
BA9700A
R6
R2 +
R1
C6
R8
Q1
B
Q2
B
+
+ CC
EE
L
C5
VOUT
GND
Fig.7 Step-up converter (BA9700A)
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet BA9700A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| BA9700 | Switching regulator for DC / DC Converters | ROHM Semiconductor |
| BA9700A | Switching regulator for DC / DC Converters | ROHM Semiconductor |
| BA9700AF | Switching regulator for DC / DC Converters | ROHM Semiconductor |
| BA9700AFV | Switching regulator for DC / DC Converters | ROHM Semiconductor |
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