Datasheet

MAX16962
4A, 2.2MHz, Synchronous Step-Down
DC-DC Converter
8Maxim Integrated
Figure 1. Internal Block Diagram
FPWM/SKIP Modes
The MAX16962 features an input (PWM) that puts the
converter either in SKIP mode or forced-PWM (FPWM)
mode of operation. See the Pin Descriptions for mode
detail. In FPWM mode, the converter switches at a con-
stant frequency with variable on-time. In skip mode, the
converter’s switching frequency is load-dependent until
the output load reaches the SKIP threshold. At higher
load current, the switching frequency does not change
and the operating mode is similar to the FPWM mode.
SKIP mode helps improve efficiency in light-load applica-
tions by allowing the converters to turn on the high-side
switch only when needed to maintain regulation. As such,
the converter does not switch MOSFETs on and off as
often as is the case in the FPWM mode. Consequently,
the gate charge and switching losses are much lower in
SKIP mode.
Overtemperature Protection
Thermal overload protection limits the total power dissi-
pation in the MAX16962. When the junction temperature
exceeds +165°C (typ), an internal thermal sensor shuts
down the internal bias regulator and the step-down con-
troller, allowing the IC to cool. The thermal sensor turns on
the IC again after the junction temperature cools by 15°C.
MAX16962
CONTROL
LOGIC
STEP-DOWN
SKIP CURRENT
COMP
CURRENT-SENSE
AMP
PEAK CURRENT
COMP
RAMP
GENERATOR
PMW
COMP
CURRENT LIM
COMP
ERROR
AMP
FPWM
P1-OK
ZERO-CROSSING
COMP
OUTS
SYNC
EN
P1-OK
PWM
PV
CLK
PV1
PV1
PV2
LX1
LX2
PGND2
PGND1
PG
GND
PGND
CLK
CLK
FPWM
POWER-GOOD
COMP
Σ
SOFT-START
GENERATOR
V
REF
VOLTAGE
REFERENCE
TH-SD
FEEDBACK
DRIVER
OSC.
MAIN
CONTROL
LOGIC
TRIM BITS
V
REF
OTP
PV
PGND