LM2750LD-5.0 National Semiconductor, LM2750LD-5.0 Datasheet

LM2750LD-5.0

Manufacturer Part Number

LM2750LD-5.0

Description

Low Noise/ 5.0V Regulated Switched Capacitor Voltage Converter

Manufacturer

National Semiconductor

Datasheet

1.LM2750LD-5.0.pdf (11 pages)

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LM2750

Low Noise, 5.0V Regulated Switched Capacitor Voltage

Converter

General Description

The LM2750 is a switched-capacitor doubler that produces a

low-noise, well regulated, 5.0V output. It can supply up to

120mA of output current over a 2.9V to 5.6V input range, as

well as up to 40mA of output current when the input voltage

is as low as 2.7V. The LM2750 has been placed in National’s

10-pin LLP, a package with excellent thermal properties that

keeps the part from overheating under almost all rated op-

erating conditions

A perfect fit for space-constrained, battery-powered applica-

tions, the LM2750 requires only 3 external components: one

input capacitor, one output capacitor, and one flying capaci-

tor. Small, inexpensive ceramic capacitors are recom-

mended for use. These capacitors, in conjunction with the

1.7MHz fixed switching frequency of the LM2750, yield low

output voltage ripple, beneficial for systems requiring a low-

noise 5V supply. Pre-regulation minimizes input current

ripple, reducing input noise to negligible levels.

A tightly controlled soft-start feature limits inrush currents

during part activation. Shutdown completely disconnects the

load from the input. Output current limiting and thermal

shutdown circuitry protect both the LM2750 and connected

devices in the event of output shorts or excessive current

loads.

Typical Application Circuit

DS200351

Features

n Inductorless solution: Application requires only 3 small

n Low Noise, 5.0V

n 85% Peak Efficiency

n Output Current up to 120mA with 2.9V ≤ V

n Wide Input Voltage Range: 2.7V to 5.6V

n Fixed 1.7MHz switching frequency for a low-noise,

n Pre-regulation minimizes input current ripple, keeping

n Tiny LLP package with outstanding power dissipation:

n Shutdown Supply Current less than 2µA

Applications

n White and Colored LED-based Display Lighting

n Cellular Phone SIM cards

n Audio Amplifier Power Supplies

n General Purpose Li-Ion-to-5V Conversion

ceramic capacitors

low-ripple output signal

the battery line (V

Usually no derating required.

70% Average Efficiency over Li-Ion Input Range

(2.9V-to-4.2V)

Output Current up to 40mA with 2.7V ≤ V

4% Regulated Output

) virtually noise-free

20035101

February 2003

www.national.com

≤ 2.9V

≤ 5.6V

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