Features • Low-Noise Fixed Frequency Operation • 1.2V Output Voltage • 3% Output Voltage Regulation • Li-Ion (3.6V) to 1.2V with 80% Efficiency • Very Low Output Ripple: 8mV @ 150mA • Output Currents up to 150mA • 2.7V to 5.5V Input Voltage Range • Shutdown Disconnects Load from VIN • 1.1MHz Switching Frequency • No Inductors…Small Solution Size • Short Circuit and Thermal Protection • LLP-10 Package (3mm × 3mm × 0.8mm) Description The LM2772 is a switched capacitor step-down regulator that produces a 1.2V output. It is capable of supplying loads up to 150mA with 3% output voltage regulation over line, load, and temperature. The LM2772 operates with an input voltage from 3.0V to 5.5V, accommodating 1-cell Li-Ion batteries and chargers. The LM2772 utilizes a highly efficient regulated multi-gain charge pump. Pre-regulated 1.1MHz fixed-frequency switching results in very low ripple and noise on both the input and the output. When output currents are low, the part automatically switches to a low-ripple PFM regulation mode to maintain high efficiency over the entire load range. The LM2772 is available in National’s 10-pad Leadless Leadframe No-Pullback Package (LLP-10). Applications • DSP, Memory, and Microprocessor Power Supplies • Mobile Phones and Pagers • Portable Electronic Devices

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Datasheet

Title		Size	Date	Other Language
	LM2772 Low-Ripple Switched Capacitor Step-Down Regulator	1190 Kbytes	17-Mar-07

Featured Application Notes

Title		Size	Date	Other Language
	AN-1714: Application Note 1714 LM2772 Evaluation Board	391 Kbytes	18-Sep-07

More Application Notes

Title		Size	Date	Other Language
	AN-1769: Application Note 1769 LM2773 Evaluation Board	419 Kbytes	2-Jun-08
	AN-1547: Application Note 1547 LM2771 Evaluation Board	670 Kbytes	3-Nov-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2772SD	CMOS7	0	18406	0	0	1089000	4	309006723
LM2772SDX	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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