BA9700 ROHM Electronics, BA9700 Datasheet - Page 4

• Manufacturer Part Number: BA9700
• Description: Switching Regulator for DC / DC Converters
• Manufacturer: ROHM Electronics

Regulator ICs
39k
4.7k
R
R
1
2
33k
R
6.8k
R
7.5k
1
3
R
3
R
0.047µ
7.5k
0.047µ
2
C
C
2
2
C
1
680p
C
680p
GND
1
V
V
GND
IN
IN
11
13
14
12
11
13
14
12
4
4
2.57V
30k
30k
2.57V
30k
30k
1.29V
1.29V
ERROR AMP
ERROR AMP
Voltage
Regulator
Voltage
Regulator
+
−
+
−
8
8
7
7
47k
47k
R
R
11
9
V
V
Fig.4 Step-up converter
Fig.3 Inverting converter
ref
ref
SW
SW
C
R
C
R
10
4
4
10
3
4
1
1
1µ
1µ
20k
22k
1
1
C
PWM COMPARATOR
C
PWM COMPARATOR
8
7
1000p
1000p
R
R
BA9700A / BA9700AF / BA9700AFV
5
5
39k
39k
3
3
Triangle
Oscillator
Triangle
Oscillator
2
2
R
R
10
8
10k
10k
9
6
5
9
6
5
100µ
C
470µ
7
C
6
R
470
R
470
L1: RCH-875 220K (Sumida Electronics)
Q
9
6
L1: RCH-875 221K (Sumida Electronics)
1
330
R
2SB1009
7
Q
2SB1009
R
470
1
R
7
8
330
R
22µH
68
L
6
1
220µH
L
RB100A
RB100A
1
Q
2SD1380
D
2
D
1
1
470µ
C
470µ
×2
4,
C
×2
C
5,
12V
5
C
6
GND
V
V
GND
OUT
OUT