Datasheet

8
LTC3832/LTC3832-1
sn3832 3832fs
TEST CIRCUITS
FB
SS
FREQSET
COMP
I
MAX
NC
NC
NC
NC
G1
G2
SHDN V
CC
V
SHDN
V
CC
PV
CC2
PV
CC1
PV
CC
I
FB
6800pF
6800pF
3832 F02
GND PGND SENSE
–
LTC3832
SENSE
+
COMP
FB
V
COMP
V
FB
G1
G2
I
FB
V
CC
PV
CC1
5V
PV
CC2
6800pF
0.1µF
10µF
6800pF
G1 RISE/FALL
G2 RISE/FALL
3832 F03
I
MAX
GND PGND
LTC3832
+
Figure 2 Figure 3
BLOCK DIAGRA
W
(LTC3832-1)
–
+
–
+
R
S
PV
CC1
G1
V
CC
/PV
CC2
G2
PGND
FB
V
REF
V
REF
+ 10%
3832 BD2
BG
Q
Q
RPOR
S
FFG2
ENABLE
G2
Q
–
+
PWM
QSS
V
REF
V
REF
+ 10%
MAX
ERR
12µA
INTERNAL
OSCILLATOR
COMP
SS
POWER DOWN
DISABLE GATE DRIVE
THERMAL SHUTDOWN
2.2V
QC
1.2V
PV
CC1
V
CC
+ 2.5V
–
+
V
APPLICATIO S I FOR ATIO
WUUU
OVERVIEW
The LTC3832/LTC3832-1 are voltage mode feedback,
synchronous switching regulator controllers (see Block
Diagram) designed for use in high power, low voltage
step-down (buck) converters. They include an onboard
PWM generator, a precision reference trimmed to ±0.8%,
two high power MOSFET gate drivers and all necessary
feedback and control circuitry to form a complete switch-
ing regulator circuit. The PWM loop nominally runs at
300kHz.
The LTC3832 includes a current limit sensing circuit that
uses the topside external N-channel power MOSFET as a
current sensing element, eliminating the need for an
external sense resistor.