an8049sh Panasonic Corporation of North America, an8049sh Datasheet - Page 2

• Manufacturer Part Number: an8049sh
• Description: 1.8-volt 3-channel Step-up, Step-down, And Polarity Inverting Dc-dc Converter Control Ic
• Manufacturer: Panasonic Corporation of North America

AN8049SH
I Block Diagram
I Pin Descriptions
2
S.C.P.
CTL3
IN+3
IN−3
Pin No.
DT3
FB3
10
11
1
2
3
4
5
6
7
8
9
1
20
18
19
2
5
Error
amplifier 2
Symbol
Error
amplifier 3
S.C.P.
CTL3
CTL2
CTL1
Error
amplifier 1
V
DT3
DT2
DT1
RB2
RB1
Off
1.26 V
REF
1.26 V
Connection for the capacitor that
provides the short-circuit protection
circuit time constant
Channel 3 soft start setting
Channel 2 soft start setting
Channel 1 soft start setting
Channel 3 on/off control
Channel 2 on/off control
Channel 1 on/off control
On/off control
Reference voltage output
Connection for the OUT2 block
output source current setting resistor
Connection for the OUT1 block
output source current setting resistor
S.C.P. comp.
V
0.9 V
REF
1.1 µA
20 kΩ
V
Description
CC
20 kΩ
1.26 V
1.1 µA
1.1 µA
1.26 V
Reference voltage
U.V.L.O.
supply V
Latch
R
S
(Allowance: ±1%)
Q
SDH00012BEB
REF
1.26 V
1.26 V
Pin No.
1.26 V
12
13
14
15
16
17
18
19
20
21
22
23
24
Symbol
OUT1
OUT2
OUT3
GND
55 kΩ
IN+3
IN−3
IN−2
IN−1
OSC
FB3
FB2
FB1
V
CC
Sawtooth wave generator
PWM1
PWM3
PWM2
OUT1 block push-pull output
OUT2 block push-pull output
Ground
OUT3 block open-collector output
Supply voltage
Oscillator circuit timing resistor and
capacitor connection
Error amplifier 3 noninverting input
Error amplifier 3 inverting input
Error amplifier 3 output
Error amplifier 2 inverting input
Error amplifier 2 output
Error amplifier 1 inverting input
Error amplifier 1 output
45 kΩ
55 kΩ
V
REF
0.7 V
0.3 V
Description
On/off
control
V
CC
V
CC
11
12
15
10
13
14
RB1
OUT1
OUT3
RB2
OUT2
GND