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.OUTC
T
R
T
GND
14 13 12 11 10 9 8
1234567
+−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 1˚C over 25˚C.
Parameter Symbol Limits Unit
VCC 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 5.0´5.0´1.6 mm glass epoxy board.
*
1 BA9700A: Reduced by 4.8 mW for each increase in Ta of 1˚C over 25˚C.
Power supply voltage
Power
dissipation
Operating temperature
Storage temperature
*
2 BA9700AF: Reduced by 4.4 mW for each increase in Ta of 1˚C over 25˚C.
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5.0V, Rt = 10kΩ, and Ct = 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 VCC = 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 µA
- 1.70 2.10 V
- 1.70 2.40 mA
- 0 7.00 µA
Symbol
V
ref
1/2 V
ref
Line
Load1
Load2
V
ref
Iosc
fosc
fosc
fdv
VIO
IIO
VICR
AV
CMRR
IIB
Vt0
Vt100
Leak
Vsat
ICC
ICCS
VCC 3.55 - 24.0 V
VO = 24V
IO = 50mA
6.0
100
Null Method
Null Method
Null Method
Null Method
Null Method
Null Method
POWER SW = 0V
VCC = 3.55~24V
I
ref
= 0.1mA, V
CC
= 3.55V
RT = 10kΩ, CT = 330pF
DUTY 0%
DUTY 100%
RT = 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
120µH
470µ
5VV
OUT
C
5
, C
6
C
8
470µF
×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
0.047µ
C
2
R
3
7.5k
R
2
15k
R
1
43k
GND
V
IN
PWM COMPARATOR
C
4
1µ
R
5
20kR
4
15k
3108
11
13
14
12
4
9
6
5
2
17
+
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
220µH
470µ
V
OUT
C
4,
C
5
C
6
470µ
×2
RB100A
D
1
GND
R810k
C
7
1000p
47k
R
9
SW
1
V
ref
2.57V
30k
30k 1.29V
3108
11
13
14
12
4
9
6
5
2
Triangle
Oscillator
Voltage
Regulator
17
ERROR AMP
C
1
680p
0.047µ
C
2
7.5k
R
3
6.8k
R
1
33k
GND
V
IN
PWM COMPARATOR
C
3
1µ
R
5
39kR
4
22k
R2
+
−
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
22µH
100µ
12V
V
OUT
C
7
C
5,
C
6
470µ
×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
108
12
4
2
Triangle
Oscillator
Voltage
Regulator
+
−
17
ERROR AMP
C
1
680p
0.047µ
C
2
R
3
7.5k
R
2
4.7k
R
1
39k
GND
V
IN
PWM COMPARATOR
C
4
1µ
R
5
39kR
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
1B
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
C6
C2
C5
R4
R6
R2
R1
R8
R10
R5
R3
R11
R7
R9
C1
C4
C3
C7
L
SW
Q1Q2
BA9700A
B
C
E
B
C
E
Fig.7 Step-up converter (BA9700A)
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!
!!
!Electrical characteristic curves
1M
100k
10k
1k
1k 10k 100k 1M
FREQUENCY
RT (Ω)
C
T
= 2200pF
C
T
= 220pF
C
T
= 0.022µF
(Hz)
Fig.8 Oscillation frequency
characteristic vs. triangular
wave oscillator resistance (1)
1M
100k
10k
1k
100p 0.01µ0.1µ1000p
FREQUENCY
CT
RT
= 20kΩ
R
T
= 10kΩ
R
T
= 30kΩ
(Hz)
(F)
Fig.9 Oscillation frequency
characteristic vs. triangular
wave oscillator resistance (2)
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00 510152025
Vref
V
CC
(V)
(VOLTAGE)
Fig.10 Output voltage vs. operating
voltage for the reference
voltage section
80
300
200
100
0
-100
-200
60
40
20
0
-20
-400 100 1k 10k 100k 1M 10M
PHASE
G A I N
FREQUENCY
(DEG)
(d B)
(Hz)
Fig.11 Phase and gain vs. frequency
for the error amplifier
BA9700A / BA9700AF / BA9700AFV
Regulator ICs
!
!!
!External dimensions (Units : mm)
SOP14DIP14
BA9700A BA9700AF
6.5±0.3
19.4±0.3
0.5±0.1
3.2±0.2 4.25±0.3
14 8
71
0.3±0.1
0.51Min.
7.62
0°∼15°
2.54
SSOP - B14
BA9700AFV
0.4±0.11.27
1
14
8.7±0.2
7
8
4.4
±
0.2
6.2±0.3
0.11
1.5±0.1
0.15
0.15±0.1
0.3Min.
0.1
0.22±0.1
0.65
8
7
14
1
6.4±0.3
4.4
±
0.2
5.0±0.2
1.15
±
0.1
0.15
±
0.1
0.3Min.
0.1
