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AN8049SH Datasheet(PDF) 2 Page - Panasonic Semiconductor

Part No. AN8049SH
Description  1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC
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Maker  PANASONIC [Panasonic Semiconductor]
Homepage  http://www.panasonic.com/industrial/
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AN8049SH Datasheet(HTML) 2 Page - Panasonic Semiconductor

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


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