PROGRAMMABLE SYNCHRONOUS DC/DC
CONVERTER, DUAL LOW DROPOUT
REGULATOR CONTROLLER
SC1186
PRELIMINARY - December 2, 1999
ELECTRICAL CHARACTERISTICS (Cont.)
Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; VOSENSE = VO; 0mV < (CS+-CS-) < 60mV; LDOV = 11.4V to 12.6V; TA = 0 to 70°C
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
LDOV Undervoltage Lockout
LDOEN Threshold
6.5
1.3
8.0
10
1.9
1.0
V
V
LDOEN Sink Current
LDOEN = 3.3V
LDOEN = 0V
0.01
-200 -300
µA
µA
Overcurrent Trip Voltage
% of Vo set point
20
1
40
5
60
60
6
%
Power-up Output Short Circuit Immunity
Output Short Circuit Glitch Immunity
Gate Pulldown Impedance
ms
ms
0.5
80
10
4
GATE(1,2)-AGND;VCC=BST=0V
300
750
k
k
Ω
Ω
VOSENSE Impedance
PIN DESCRIPTION
Pin Pin Name
Pin Function
1
2
3
4
5
6
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
REF
Buffered Reference Voltage output
AGND
1
2
3
4
5
6
7
8
9
24
23
22
21
20
19
18
17
16
15
14
13
GATE2
LDOV
VID0
VID1
VID2
7
8
9
LDOEN
CS-
CS+
LDO Supply Monitor.
GATE1
LDOS1
LDOS2
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
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
VCC
REF
LDOEN
CS-
CS+
PGNDH
VID3
VID4
10 PGNDH
11 DH
12 PGNDL
13 DL
14 BSTL
15 BSTH
16 EN(1)
VOSENSE
EN
BSTH
BSTL
DL
10
11
12
DH
PGNDL
(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:
(1) All logic level inputs and outputs are open
collector TTL compatible.
23 LDOV
24 GATE2
3
© 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SEMTECH [ SEMTECH CORPORATION ]
