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MAX1960

2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining

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Overview

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 synchronization 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.

MAX1960, MAX1961, MAX1962: Functional Diagram

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Key Features

0.5% Accurate Output
Operates from 2.35V to 5.5V Supply
Generates Low Output Voltage Down to 0.8V
On-Chip Charge Pump Provides 5V Gate Drive
Ceramic or Electrolytic Capacitors
94% Efficiency
External Synchronization from 450kHz to 1.2MHz
500kHz/1MHz Fixed-Frequency PWM Operation
Fast Transient Response
Two Converters Can Operate 180° Out-of-Phase
±4% Voltage Margining for System Test
10% Accurate Current Sensing (MAX1962)
Adaptive Dead Time Prevents Shoot-Through

Applications/Uses

ASIC, FPGA, DSP, and CPU Core and I/O Voltages
Cellular Base Stations
Server and Storage Systems
Telecom and Network Equipment

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX1960

2.35

5.5

0.8

Resistor

External

Yes

1000

QSOP/20

$2.73 @1k

MAX1961

4.5

1.5

1.8

2.5

3.3

Preset

Resistor

QSOP/20

$2.85 @1k

MAX1962

4.5

1.5

1.8

2.5

3.3

Preset

Resistor

QSOP/20

$3.46 @1k

See All Step-Down Switching Regulators (367)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Environmental Management System >

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