Low-Noise Switched-Capacitor Boost Regulator
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LM2750, LM2750-ADJ
SNVS180N – APRIL 2002 – REVISED APRIL 2016
LM2750 Low-Noise Switched-Capacitor Boost Regulator
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 LowNoise, 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
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