LTC3129-1_15 Datasheet, PDF (10/30 Pages) Linear Technology – 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3A Quiescent Current

LTC3129-1
Pin Functions (QFN/MSOP)
PGND (Pin 15/Pin 13, Exposed Pad Pin 17/Pin 17): Power _{Table 1. VOUT Program Settings}
Ground. Provide a short direct PCB path between PGND
VS3 PIN
VS2 PIN
VS1 PIN
V_OUT
and the ground plane. The exposed pad must also be
0
0
0
2.5V
soldered to the PCB ground plane. It serves as a power
0
ground connection, and as a means of conducting heat
0
away from the die.
0
0
V_CC
3.3V
V_CC
0
4.1V
V_CC
V_CC
5V
SW1 (Pin 16/Pin 14): Switch Pin. Connect to one side of
V_CC
0
0
6.9V
the inductor. Keep PCB trace lengths as short and wide
V_CC
0
V_CC
8.2V
as possible to reduce EMI.
V_CC
V_CC
0
12V
V_CC
V_CC
V_CC
15V
Block Diagram
V_IN
10
V_IN
BST1
SW1
SW2
BST2
V_REF
START
V_CC
LDO
V_{CC_GD}
V_CC
4.1V
V_CC
DRIVER
START
V_REF
1.175V
V_REF
V_{REF_GD}
RUN
+
0.9V –
START
+
1.22V –
V_{IN 1.175V}
–
+
SD
UVLO
DRIVER
DRV_B
DRV_A
I_SENSE
500mA
+
–
I_LIM
ENABLE
I_SENSE –
20mA +
I_ZERO
RESET SOFT-START
A
I_SENSE
D
B
I_SENSE
C
LOGIC
PWM
+
THERMAL
SHUTDOWN
–
V_CC
DRIVER
V_OUT
V_OUT
DRIVER
DRV_C
DRV_D
UV
–
+ 1.1V
I_SENSE
VS1
VS2
V_OUT
SELECT
INPUTS
VS3
–
V_C
FB
+
1.175V
MPPC
+
1.175V –
PWM
5M
–
SLEEP
100mV +
GND
OSC
600mV
–
+
CLAMP
PGND
–
–7.5% +
PGOOD
31291 BD
31291fb
For more information www.linear.com/LTC3129-1