LM2750SDX-ADJSLASHNOPB.A中文资料德州仪器数据手册PDF规格书

1 Features

1• Wide Input Voltage Range: 2.7 V to 5.6 V

• Inductorless Solution: Application Requires Only

Three Small Ceramic Capacitors

• Fixed 5-V Output and Adjustable Output Voltage

Options Available

• 85% Peak Efficiency

– 70% Average Efficiency Over Li-Ion Input

Range (2.9 V to 4.2 V)

• Output Current up to 120 mA With 2.9 V ≤ VIN ≤

5.6 V

– Output Current up to 40 mA With 2.7 V ≤ VIN ≤

2.9 V

• Fixed 1.7-MHz Switching Frequency for a Low-

Noise, Low-Ripple Output Signal

• Pre-Regulation Minimizes Input Current Ripple,

Keeping the Battery Line

(VIN) Virtually Noise-Free

• Shutdown Supply Current Less Than 2 μA

• Tiny WSON Package With Outstanding Power

Dissipation: Usually No Derating Required

2 Applications

• White and Colored LED-Based Display Lighting

• Cellular Phone SIM Cards

• Audio Amplifier Power Supplies

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

• EPOS Barcode Scanners

• Industrial Handheld Radios

3 Description

The LM2750 is a regulated switched-capacitor

doubler that produces a low-noise output voltage. The

5-V output voltage option (LM2750-5.0) can supply up

to 120 mA of output current over a 2.9-V to 5.6-V

input range, as well as up to 40 mA of output current

when the input voltage is as low as 2.7 V. An

adjustable output voltage option with similar output

current capabilities is also available (LM2750-ADJ).

The LM2750 has been placed in TI's 10-pin WSON, a

package with excellent thermal properties that keeps

the part from overheating under almost all rated

operating conditions.

A perfect fit for space-constrained, battery-powered

applications, the LM2750 requires only three external

components: one input capacitor, one output

capacitor, and one flying capacitor. Small,

inexpensive ceramic capacitors are recommended for

use. In conjunction with the

1.7-MHz fixed switching frequency of the LM2750,

these capacitors yield low output-voltage ripple, which

is beneficial for systems requiring a low-noise supply.

Pre-regulation minimizes input current ripple, thus

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 other connected devices in the event

of output shorts or excessive current loads.