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)
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
30k
30k
V
ref
Error
Amp
PWM
Comparator
NON
INVERT
INPUT
INVERT
INPUT
POWER
SW
1/2 V
ref
V
ref
N. C.
V
CC
FEED
BACK
D - TIME
CONT
N. C.
OUT
C
T
R
T
GND
14
13
12
11
10
9
8
1
2
3
4
5
6
7
+
-
Voltage
Regulator
Triangle
Oscillator
BA9700A
BA9700AF
!
!
!
!Absolute maximum ratings
(Ta = 25
C)
*
3 BA9700AFV : Reduced by 3.5 mW for each increase in Ta of
1C over 25C.
Parameter
Symbol
Limits
Unit
V
CC
24
V
BA9700A
Pd
600
mW
BA9700AF
350
*
2
*
1
BA9700AFV
350
*
3
Topr
-20~+80
C
Tstg
-55~+150
C
*
2,
*
3 When mounted on a 5.05.01.6 mm glass epoxy board.
*
1 BA9700A: Reduced by 4.8 mW for each increase in Ta of
1C over 25C.
Power supply voltage
Power
dissipation
Operating temperature
Storage temperature
*
2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of
1C over 25C.
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!Electrical characteristics
(unless otherwise noted, Ta = 25
C, V
CC
= 5.0V, R
t
= 10k
, and C
t
= 330pF)
Parameter
Min.
Typ.
Max.
Unit
Conditions
2.48
2.57
2.66
V
I
ref
= 0.1mA
1.22
1.29
1.36
V
-
3.00
12.0
mV
V
CC
= 3.55V~24V
-
1.00
5.00
mV
I
ref
= 0.1mA~1.0mA
-
6.00
10.0
mV
I
ref
= 0.1mA~8.0mA
2.48
2.57
2.66
V
-
10.0
30.0
mA
V
ref
= 0V
-
230
-
kHz
-
10
-
%
-
1
-
%
-6.0
-
mV
-100
-
nA
1.60
1.90
-
V
70.0
80.0
-
dB
70.0
80.0
-
dB
-
180
500
nA
-
2.04
2.24
V
1.25
1.43
-
V
-
-
10.0
A
-
1.70
2.10
V
-
1.70
2.40
mA
-
0
7.00
A
Symbol
V
ref
1/2 V
ref
Line
Load1
Load2
V
ref
Iosc
fosc
fosc
fdv
V
IO
I
IO
V
ICR
A
V
CMRR
I
IB
V
t0
V
t100
Leak
Vsat
I
CC
I
CCS
V
CC
3.55
-
24.0
V
V
O
= 24V
I
O
= 50mA
6.0
100
Null Method
Null Method
Null Method
Null Method
Null Method
Null Method
POWER SW = 0V
V
CC
= 3.55~24V
I
ref
= 0.1mA, V
CC
= 3.55V
R
T
= 10k
, C
T
= 330pF
DUTY 0%
DUTY 100%
R
T
= OPEN POWER SW = 2.5V
R and C are constant
T
T
Output voltage
Line regulation
Load regulation 1
Load regulation 2
Output voltage when power decreases
Output current when short-circuited
Triangular wave oscillation section
Oscillation frequency
Standard deviation of
oscillation frequency
Frequency variation (V )
CC
Error amplifier section
Input offset voltage
Input offset current
Maximum input voltage
Open loop gain
Common-mode rejection ratio
Input bias current
Threshold voltage 1
Threshold voltage 2
Output transistor leakage current
Output saturation voltage
Quiescent current
Standby current
Operating voltage
1/2 V output voltage
ref
PWM comparator section
Output section
Total device
Reference voltage section
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!
!
!
!Timing chart
ERR. AMP
OUTPUT
DEAD - TIME
H
L
PWM. COMP
OUTPUT
H
L
OUTPUT TR.
COLLECTOR
Fig.1
!
!
!
!Application examples
L1: RCH-875 121K (Sumida Electronics)
Fig.2 Step-down converter
R
6
560
R
7
560
N.C.
N.C.
Q
1
2SB1009
L
1
120
H
470
5V
V
OUT
C
5
, C
6
C
8
470
F
2
RB100A
D
1
GND
R
8
15k
C
9
1000p
47k
R
9
SW
1
V
ref
2.57V
30k
30k
1.29V
Triangle
Oscillator
Voltage
Regulator
+
-
ERROR AMP
C
1
680p
0.047
C
2
R
3
7.5k
R
2
15k
R
1
43k
GND
V
IN
PWM COMPARATOR
C
4
1
R
5
20k
R
4
15k
3
10
8
11
13
14
12
4
9
6
5
2
1
7
+
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
L1: RCH-875 220K (Sumida Electronics)
Fig.3 Inverting converter
330
R
7
330
R
6
Q
1
2SB1009
L
1
220
H
470
V
OUT
C
4,
C
5
C
6
470
2
RB100A
D
1
GND
R
8
10k
C
7
1000p
47k
R
9
SW
1
V
ref
2.57V
30k
30k
1.29V
3
10
8
11
13
14
12
4
9
6
5
2
Triangle
Oscillator
Voltage
Regulator
1
7
ERROR AMP
C
1
680p
0.047
C
2
7.5k
R
3
6.8k
R
1
33k
GND
V
IN
PWM COMPARATOR
C
3
1
R
5
39k
R
4
22k
R
2
+
-
L1: RCH-875 221K (Sumida Electronics)
Fig.4 Step-up converter
R
6
470
R
9
470
R
7
470
R
8
68
Q
1
Q
2
2SB1009
L
1
22
H
100
12V
V
OUT
C
7
C
5,
C
6
470
2
RB100A
D
1
GND
R
10
10k
C
8
1000p
47k
R
11
SW
1
V
ref
2.57V
30k
30k
1.29V
11
13
14
10
8
12
4
2
Triangle
Oscillator
Voltage
Regulator
+
-
1
7
ERROR AMP
C
1
680p
0.047
C
2
R
3
7.5k
R
2
4.7k
R
1
39k
GND
V
IN
PWM COMPARATOR
C
4
1
R
5
39k
R
4
20k
2SD1380
9
6
5
3
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!
!
!
!Basic application board patterns and component arrangemrnts
+
+
+
+
+
( ) ( )
V
OUT
GND
V
IN
GND
C
6
C
2
C
5
R
2
R
4
R
6
R
5
R
8
R
3
R
9
R
7
C
9
C
3
C
11
C
4
C
10
C
1
C
8
C
7
R
1
L
Q
1
B
C
E
BA9700A
BA9700A - 1
SW
D
Fig.5 Step-down converter
+
+
+
V
OUT
GND
V
IN
GND
C
5
C
2
C
4
R
4
R
6
R
5
R
8
R
3
R
2
R
9
C
3
C
1
C
6
C
7
R
1
L
Q
1
B
C
E
BA9700A
BA9700A - 2
SW
D
1
Fig.6 Inverting converter (BA9700A)
+
+
+
V
OUT
GND
V
IN
GND
C
6
C
2
C
5
R
4
R
6
R
2
R
1
R
8
R
10
R
5
R
3
R
11
R
7
R
9
C
1
C
4
C
3
C
7
L
SW
Q
1
Q
2
BA9700A
B
C
E
B
C
E
Fig.7 Step-up converter (BA9700A)
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