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The MAX1630A–MAX1635A are buck-topology, stepdown,
switch-mode, power-supply controllers that generate
logic-supply voltages in battery-powered systems.
These high-performance, dual-/triple-output devices
include on-board power-up sequencing, power-good
signaling with delay, digital soft-start, secondary winding
control, low-dropout circuitry, internal frequency-compensation
networks, and automatic bootstrapping.
Up to 96% efficiency is achieved through synchronous
rectification and Maxim's proprietary Idle Mode™ control
scheme. Efficiency is greater than 80% over a 1000:1
load-current range, which extends battery life in system-suspend
or standby mode. Excellent dynamic response
corrects output load transients caused by the latest
dynamic-clock CPUs within five 300kHz clock cycles.
Strong 1A on-board gate drivers ensure fast external
n-channel MOSFET switching.
These devices feature a logic-controlled and synchronizable,
fixed-frequency, pulse-width-modulation (PWM)
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry applications.
Asserting the SKIP-bar pin enables fixed-frequency
mode for lowest noise under all load conditions.
The MAX1630A–MAX1635A include two PWM regulators,
adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V
modes. All these devices include secondary feedback
regulation, and the MAX1630A/MAX1632A/MAX1633A/
MAX1635A each contain 12V/120mA linear regulators.
The MAX1631A/MAX1634A include a secondary feedback
input (SECFB), plus a control pin (STEER) that
selects which PWM (3.3V or 5V) receives the secondary
feedback signal. SECFB provides a method for adjusting
the secondary winding voltage regulation point with an
external resistor-divider, and is intended to aid in creating
auxiliary voltages other than fixed 12V.
The MAX1630A/MAX1631A/MAX1632A contain internal
output overvoltage and undervoltage protection features.
The MAX1630A family has improved RF immunity over
the MAX1630 family.
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