MAX1960_09 Datasheet, PDF (1/29 Pages) Maxim Integrated Products – 2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining

19-2740; Rev 1; 6/09
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2.35V to 5.5V, 0.5% Accurate, 1MHz PWM
Step-Down Controllers with Voltage Margining
General Description
The MAX1960/MAX1961/MAX1962 high-current, high-
efficiency voltage-mode step-down DC-DC controllers
operate from a 2.35V to 5.5V input and generate output
voltages down to 0.8V at up to 20A. An on-chip charge
pump generates a regulated 5V for MOSFET drive.
Additionally, adaptive dead-time drivers allow a
wide variety of MOSFETs to be used without risking
shoot-through.
Fixed-frequency PWM operation and external synchro-
nization make these controllers suitable for telecom
and datacom applications. The operating frequency is
programmable to either 500kHz or 1MHz, or from
450kHz to 1.2MHz with an external clock. A clock output
is provided to synchronize another converter for 180°
out-of-phase operation. A high closed-loop bandwidth
provides excellent transient response for applications
with dynamic loads.
Lossless current sensing in the MAX1960 and
MAX1961 is achieved by monitoring the drain-to-source
voltage of the low-side external FET. The current limit is
scalable to accommodate a wide variety of MOSFETs
and load currents. The MAX1962 has 10% accurate
sense-resistor-based current limiting.
The MAX1960 and MAX1962 have an adjustable output
voltage from 0.8V to 4.95V. The MAX1961 and
MAX1962 have four preset output voltages (1.5V, 1.8V,
2.5V, and 3.3V) and feature 0.5% voltage accuracy
over temperature, line, and load variations. The
MAX1960 and MAX1961 also feature voltage-margining
control inputs that shift the output voltage up or down
by 4% for system testing.
Applications
ASIC, FPGA, DSP, and CPU Core and I/O Voltages
Cellular Base Stations
Telecom and Network Equipment
Server and Storage Systems
Pin Configurations and Selector Guide appear at the end
of the data sheet.
Features
o 0.5% Accurate Output
o Operates from 2.35V to 5.5V Supply
o Generates Low Output Voltage Down to 0.8V
o On-Chip Charge Pump Provides 5V Gate Drive
o Ceramic or Electrolytic Capacitors
o 94% Efficiency
o External Synchronization from 450kHz to 1.2MHz
o 500kHz/1MHz Fixed-Frequency PWM Operation
o Fast Transient Response
o Two Converters Can Operate 180° Out-of-Phase
o ±4% Voltage Margining for System Test
o 10% Accurate Current Sensing (MAX1962)
o Adaptive Dead Time Prevents Shoot-Through
Ordering Information
PART
MAX1960EEP
MAX1961EEP
MAX1962EEP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 QSOP
20 QSOP
20 QSOP
Typical Operating Circuit
INPUT
2.35V TO 5.5V
C+
VCC
C-
AVDD
VOLTAGE
MARGINING
AND ON/OFF
MAX1960
VDD
CTL1
BST
CTL2
COMP
DH
REF
LX
DL
GND
PGND
ILIM
OPTIONAL
SYNCHRONIZATION
FSET/SYNC
CLKOUT
180° OUT-OF-PHASE
CLKOUT
FB
OUTPUT
0.8 TO 0.87 ✕ VIN
UP TO 20A
________________________________________________________________ Maxim Integrated Products 1
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