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MAX1951A
1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC Step-Down Regulator with Enable
1MHz, All-Ceramic, 2.6V to 5.5V Input, 2A, PWM Step-Down DC-DC Regulator Requires Only 10µF Ceramic Capacitor
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Status
Active: In Production.
Description
The MAX1951A high-efficiency, DC-DC step-down switching regulator delivers up to 2A of output current. The device operates from an input voltage range of 2.6V to 5.5V and provides an adjustable output voltage from 0.8V to VIN, making the MAX1951A ideal for on-board postregulation applications. The MAX1951A total output error is less than ±1.5% over load, line, and temperature.
The MAX1951A operates at a fixed frequency of 1MHz with an efficiency of up to 94%. The high operating frequency minimizes the size of external components. Internal soft-start control circuitry reduces inrush current. Short-circuit and thermal-overload protection improve design reliability.
The MAX1951A can start up safely with a prebiased or without a preexisting output. This feature simplifies tracking supply designs for core and I/O applications and redundant supply designs.
The MAX1951A is available in an 8-pin SO package and operates over the -40°C to +85°C extended temperature range.
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Data Sheet
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Key Features
- Compact 0.385in² Circuit Footprint
- 10µF Ceramic Input and Output Capacitors, 2µH Inductor for 2A Output
- Efficiency Up to 94%
- 1.5% Output Accuracy Over Load, Line, and Temperature
- Guaranteed 2A Output Current
- Operates from 2.6V to 5.5V Supply
- Adjustable Output from 0.8V to VIN
- Internal Digital Soft-Soft
- Short-Circuit and Thermal-Overload Protection
- 1MHz Switching Frequency Reduces Component Size
- Enable Input Audio Shutdown for Reducing Power Consumption
- Safe Startup into Prebiased Output
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Applications/Uses
- ASIC/DSP/µP/FPGA Core and I/O Voltages
- Networking and Telecommunications
- Servers
- Set-Top Boxes
- TVs
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1951A |
2.6 |
5.5 |
0.8 |
5 |
2 |
2 |
Resistor |
1 |
1000 |
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31 |
$1.85 @1k |
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See All Step-Down Switching Regulators (284)
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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 prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
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Information Index
Document Ref.: 19-4689
Rev 0;
2009-08-20
This page last modified: 2009-08-20
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