MAX1961

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


Please check latest availability status for a specific part variant.

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 MAX1960, MAX1961, MAX1962: Functional Diagram Enlarge+

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
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1960 2.355.50.85-Resistor20ExternalYes11000
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 (380)
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.

Quality and Environmental Data

Product Reliability Reports: MAX1961.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX1961EEP+
  • MAX1961EEP+T
  • 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.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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