AN8049 Panasonic Semiconductor, AN8049 Datasheet - Page 10

• Manufacturer Part Number: AN8049
• Description: 1.8-volt 3-channel step-up/ step-down/ and polarity inverting DC-DC converter control IC
• Manufacturer: Panasonic Semiconductor

AN8049FHN
10
Pin No.
Terminal Equivalent Circuit (continued)
20
21
22
23
24
19
21
21
1.5 k
V
V
1.5 k
14
CC
50 k
CC
24
1.26 V
1.26 V
23
Equivalent circuit
1.1 A
7 18 15
50 k
1.26 V
V
CC
31 A
0.5 mA
31 A
0.5 mA
min.
min.
Latch
OSC
OSC
PWM3
S
R
20
22
Q
1.26 V
Output
shutoff
PWM2
PWM1
FB2:
Output from the error amplifier 2.
This circuit can provide a source
current of 31 A or a sink current of
0.5 mA (minimum).
IN 1:
Inverting input to the error amplifier 1.
FB1:
Output from the error amplifier 1.
This circuit can provide a source
current of 31 A or a sink current of
0.5 mA (minimum).
S.C.P.:
Connection for the capacitor that sets
the timer latch short-circuit protection
circuit time constant. Use a capacitor
with a value of 1 000 pF or higher.
The charge current I
typical.
DT3:
Sets the channel 3 soft start time.
Set the time by connecting a capacitor
between this pin and ground. Note that
although the channel 3 maximum on duty
is set internally to 86%, the maximum
on duty can be set to a value of 86% or
less by inserting a resistor between this
pin and ground, and can be set to a value
of 86% or more by inserting a resistor
between this pin and the V
Description
CHG
is 1.1 A
REF
Voltage Regulators
pin.
I/O
O
O
O
I
I