LTC3532 LINER [Linear Technology], LTC3532 Datasheet - Page 6

• Manufacturer Part Number: LTC3532
• Description: Micropower Synchronous Buck-Boost DC/DC Converter
• Manufacturer: LINER [Linear Technology]

BLOCK DIAGRA
LTC3532
SHDN/SS (Pin 8): Combined Soft-Start and Shutdown.
Grounding this pin shuts down the IC. Tie to >1.5V to
enable the IC and >2.4V to ensure the error amp is not
clamped from soft-start. For Burst Mode operation, this pin
must be pulled up to within 0.5V of V
shutdown command signal to this pin will provide a soft-
start function by limiting the rise time of the V
FB (Pin 9): Feedback Pin. Connect resistor divider tap
here. The output voltage can be adjusted from 2.4V to
5.25V. The feedback reference is typically 1.22V. Set V
according to the formula:
6
PI FU CTIO S
U
U
7
1
8
V
R
SHDN/SS
IN
T
V
U
IN
1.1A
2.3V
W
V
SHUTDOWN
SOFT-START
IN
SW A
OSC
+
–
+
–
SW B
PEAK CURRENT
UVLO
IN
V
SHUTDOWN
LIMIT
CC
. An RC from the
3
SW1
CONDUCTION
ANTICROSS
C
DRIVERS
LOGIC
GATE
PWM
AND
pin.
5
GND
OUT
SLEEP
PWM COMP
4
SW C
SW2
V
tion network is connected from this pin to the FB pin to
compensate the loop. Refer to the Applications Information
section for component value selection.
Exposed Pad (Pin11): The exposed pad (DFN Package)
must be soldered to PCB ground for electrical contact and
rated thermal performance.
C
V
(Pin10): Error Amp Output: A frequency compensa-
OUT
+
–
+
–
–
REVERSE
SW D
AMP
=
SS
+
1A
1.22V • R1+ R2
V
REF
+
–
g
CONTROL AND
m
AUTOMATIC
Burst Mode
V
= 1/60k
C
R2
ERROR
HOLD
(
AMP
SHUTDOWN
THERMAL
1.22V
V
REF
+
–
1.22V
)
BURST
V
OUT
FB
V
3532 BD
C
10
6
9
2
3532fc