LTC3530 LINER [Linear Technology], LTC3530 Datasheet - Page 6

• Manufacturer Part Number: LTC3530
• Description: Wide Input Voltage Synchronous Buck-Boost DC/DC Converter
• Manufacturer: LINER [Linear Technology]

PIN FUNCTIONS
LTC3530
GND (Pin 5): Ground for the IC.
V
capacitor is placed from V
capacitor is recommended as close to the V
pins as possible.
V
A 10μF ceramic capacitor is recommended as close to the
V
SHDN/SS (Pin 8): Combined Soft-Start and Shutdown.
Applied voltage <0.4V shuts down the IC. Tie to >1.4V to
enable the IC and >1.6V to ensure the error amp is not
clamped from soft-start. An R-C from the shutdown com-
mand signal to this pin will provide a soft-start function
by limiting the rise time of V
6
BLOCK DIAGRAM
OUT
IN
IN
(Pin 7): Input Supply Voltage. Internal V
and GND pins as possible.
(Pin 6): Output of the Synchronous Rectifi er. A fi lter
R
R
SS
T
C
SS
C
IN
7
8
1
V
SHDN/SS
R
IN
T
OUT
C
SHUTDOWN
SOFT-START
.
to GND. A ceramic bypass
OSC
SW A
SW1
SW B
SHUTDOWN
3
OUT
CC
GND
CONDUCTION
ANTICROSS
for the IC.
ANTI-RING
DRIVERS
and GND
LOGIC
GATE
PWM
AND
L1
5
SLEEP
COMPARATORS
4
SW C
PWM
SW2
FB (Pin 9): Feedback Pin. Connect resistor divider tap here.
The output voltage can be adjusted from 1.8V to 5.25V.
The feedback reference is typically 1.215V.
V
nected from this pin to FB for loop compensation. Refer
to “Closing the Feedback Loop” section for component
selection guidelines. During Burst Mode operation, V
internally clamped.
Exposed Pad (Pin 11, DD Package Only): Ground. This
pin must be soldered to the PCB and electrically connected
to ground.
C
V
(Pin10): Error Amp Output. An R-C network is con-
+
–
+
–
–
OUT
REVERSE
SW D
AMP
= 1.215V • 1+
+
2A
V
REF
+
–
G
BURST MODE
AUTOMATIC
m
CONTROL
= 1/60k
ERROR
AMP
SHUTDOWN
THERMAL
1.215V
V
REF
+
–
R2
R1
1.215V
BURST
V
OUT
3530 BD
FB
V
C
10
6
9
2
R
C
BURST
P1
R1
R2
C
C
OUT
BURST
3530fb
C
is