MAX1974

Smallest 1A, 1.4MHz Step-Down Regulators


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Description

The MAX1973/MAX1974 are constant-frequency 1.4MHz pulse-width-modulated (PWM) current-mode step-down regulators. The output voltage can be set as low as 0.75V using an external voltage-divider, or it can be set to preset outputs of 1V, 1.5V (MAX1974), 1.8V, or 2.5V (MAX1973) without requiring external resistors. The MAX1973 also includes a voltage-margining feature that offsets the output voltage up or down 4% to facilitate board-level production testing.

A fixed 1.4MHz operating frequency ensures operation outside the DSL frequency band, provides fast transient response, and allows the use of small external components. Only 4.7µF input and output ceramic capacitors are needed for 1A applications. Forced PWM operation ensures a constant switching frequency over all load conditions.

Output voltage accuracy is ±1% over load, line, and temperature operating ranges. The MAX1973 features voltage margining; the MAX1974 provides a POK output to indicate when the output has reached 90% of its nominal regulation voltage. Both devices are available in small 10-pin µMAX® packages.

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MAX1973, MAX1974: Typical Operating Circuit MAX1973, MAX1974: Typical Operating Circuit Enlarge+

Key Features

  • Tiny Circuit Footprint of 0.19in²
  • Ultra-Low Circuit Height of 1.8mm
  • 4.7µF Ceramic Input and Output Capacitors
  • 2.6V to 5.5V Input Voltage
  • 1A Output Current
  • 1% Accurate
  • Built-In ±4% Logic-Controlled Voltage Margining (MAX1973)
  • Preset 1V, 1.5V, 1.8V, 2.5V, or 0.75V to VIN Adjustable Output
  • Fixed-Frequency PWM Current-Mode Operation
  • 1.4MHz Switching Frequency, Operate Outside DSL Band
  • 100% Duty-Cycle Dropout Capability
  • Small External Components

Applications/Uses

  • Cell Phone Base Stations
  • Central Office DSL and Telecom
  • DSL and Wireless Modems/Routers
  • DSP/ASIC Core and I/O supplies
  • Network Equipment
  • Optical Modules

See parametric specs for Step-Down Switching Regulators (407)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingPower Good SignalDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX1973 2.65.51.255
1.8
2.5
Preset
Resistor
0.95InternalYes-11400
UMAX/10
$3.07 @1k
MAX1974 0.75
1
1.5
Yes
UMAX/10

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.
Product Reliability Reports: MAX1974.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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