MAX1960, MAX1961, MAX1962 2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining

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.

Key Features

Applications/Uses

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

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

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Preset V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1960

2.35

5.5

0.8

Resistor

1000
500

•	Adjustable Frequency

•	Current Limit

•	External Synchronization

•	Fixed Frequency/ PWM Operation

•

Shutdown

•	Soft Start

•	Synchronous Rectifier

Yes

QSOP/20

Yes

-40 to +85

$1.95 @ 1k

MAX1961

4.5

1.5
1.8
2.5
3.3

Preset
Resistor

$2.05 @ 1k

MAX1962

4.5

1.5
1.8
2.5
3.3

Preset
Resistor

$2.50 @ 1k

See All Step-Down Switching Regulators (223)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Preset V_OUT (V)

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Package

Price^**

MAX1960

Step-Down

2.35

5.5

0.8

1000
500

QSOP/20

$1.95 @ 1k

MAX1961

1.5
1.8
2.5
3.3

4.5

$2.05 @ 1k

MAX1962

1.5
1.8
2.5
3.3

4.5

$2.50 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.

Reliability Reports


		Show FIT data for:

		Reliability Report: MAX1960EEP.pdf MAX1961EEP.pdf

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Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-12 of 12

MAX1960

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1960EEP

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1960EEP-T

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1960EEP+T

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1960EEP+

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1961

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1961EEP+T

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1961EEP+

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1961EEP-T

-40°C to +85°C

See data sheet

MAX1961EEP

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1962

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1962EEP+

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1962EEP+T

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1962EEP-T

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1962EEP

QSOP;20 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E20-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis