PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1182/3
August 25, 1998
PIN DESCRIPTION
Pin Pin Name
Pin Function
1
2
3
4
5
6
7
AGND
GATE1
LDOS1
LDOS2
VCC
Small Signal Analog and Digital Ground
Gate Drive Output LDO1
Sense Input for LDO1
Sense Input for LDO2
Input Voltage
Top View
OVP
High Signal out if VO>setpoint +20%
AGND
1
2
24
23
22
21
20
19
18
17
16
15
14
13
GATE2
LDOV
VID0
VID1
VID2
PWRGOOD(1) Open collector logic output, high if VO
within 10% of setpoint
GATE1
LDOS1
LDOS2
3
4
5
6
8
9
CS-
CS+
Current Sense Input (negative)
Current Sense Input (positive)
Power Ground for High Side Switch
High Side Driver Output
Power Ground for Low Side Switch
Low Side Driver Output
VCC
OVP
PWRGOOD
CS-
VID3
VID4
7
8
9
10
11
12
10 PGNDH
11 DH
12 PGNDL
13 DL
VOSENSE
EN
BSTH
BSTL
DL
CS+
PGNDH
DH
PGNDL
14 BSTL
15 BSTH
16 EN(1)
Supply for Low Side Driver
Supply for High Side Driver
Logic low shuts down the converter;
High or open for normal operation.
Top end of internal feedback chain
(24 Pin SOIC)
17 VOSENSE
VID4(1)
18
Programming Input (MSB)
Programming Input
Programming Input
VID3(1)
19
VID2(1)
20
VID1(1)
21
Programming Input
VID0(1)
Programming Input (LSB)
+12V for LDO section
Gate Drive Output LDO2
22
Note:
23 LDOV
24 GATE2
(1) All logic level inputs and outputs are open
collector TTL compatible.
3
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SEMTECH [ SEMTECH CORPORATION ]
