LTC3528_15 Datasheet, PDF (7/18 Pages) Linear Technology – 1A, 1MHz Synchronous Step-Up DC/DC Converters

LTC3528/LTC3528B
PIN FUNCTIONS
SGND (Pin 7): Signal Ground. Provide a short direct PCB
path between SGND and the (–) side of the input and
output capacitors.
V_IN (Pin 8): Battery Input Voltage. Connect a minimum of
1µF ceramic decoupling capacitor from this pin to ground.
GND (Exposed Pad Pin 9): The exposed pad must be
soldered to the PCB ground plane. It serves as another
ground connection and as a means of conducting heat
away from the die.
BLOCK DIAGRAM
V_IN
0.7V
TO 5V
C_IN
4.7µF
L1
4.7µH
8
V_IN
V_OUT
V_BEST
V_B
ANTI-RING
5
SW
V_SEL
WELL
SWITCH
V_{OUT 4}
1 ^SHDN
4M
SHUTDOWN SHUTDOWN
V_REF
UVLO
V_REF
UVLO
START-UP
3 ^PGOOD
1MHz
CLK
OSC
V_REF – 10%
FB
THERMAL
TSD
SHUTDOWN
PGND
6
GATE DRIVERS
AND
ANTI-CROSS
CONDUCTION
PK
COMP
PK
–+
I_ZERO
Σ
COMP
SLOPE
COMP
FB
2
LOGIC
I_ZERO
MODE
CONTROL
(LTC3528)
BURST
CLAMP
ERROR AMP
SLEEP COMP
V_REF
FB
WAKE
SGND
7
SOFT-START
EXPOSED
PAD
9
3528 BD
V_OUT
1.6V
TO 5.25V
R2
C_OUT
10µF
R1
3528fd
7