LTC3832-1 Linear Technology, LTC3832-1 Datasheet - Page 8

• Manufacturer Part Number: LTC3832-1
• Description: High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation
• Manufacturer: Linear Technology

BLOCK DIAGRA
APPLICATIO S I FOR ATIO
LTC3832/LTC3832-1
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
TEST CIRCUITS
8
NC
NC
NC
NC
COMP
SS
FB
SS
FREQSET
COMP
I
MAX
V
SHDN
GND
SHDN
QC
U
V
V
CC
CC
PGND
LTC3832
12 A
Figure 2
PV
U
W
OSCILLATOR
CC2
INTERNAL
SENSE
2.2V
1.2V
QSS
PV
PV
CC1
(LTC3832-1)
–
CC
V
+
SENSE
REF
W
I
FB
ERR
3832 F02
+
G1
G2
THERMAL SHUTDOWN
–
–
+
PWM
U
6800pF
6800pF
V
+
–
POWER DOWN
V
PV
V
REF
CC
CC1
+ 2.5V
–
+ 10%
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.
MAX
V
DISABLE GATE DRIVE
COMP
+
V
FB
POR
COMP
FB
S
R
S
R
FFG2
I
MAX
I
Q
Q
Q
FB
V
REF
V
+ 10%
CC
LTC3832
ENABLE
G2
V
GND
REF
PV
Figure 3
5V
CC1
PGND
PV
BG
CC2
G1
G2
3832 BD2
+
PV
G1
V
G2
PGND
FB
CC
3832 F03
CC1
10 F
6800pF
6800pF
/PV
CC2
G1 RISE/FALL
G2 RISE/FALL
sn3832 3832fs
0.1 F