LM2757 Series

Switched Capacitor Boost Regulator with High Impedance Output in Shutdown

Catalog

Switched Capacitor Boost Regulator with High Impedance Output in Shutdown

Part	Function	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Output (Min/Fixed)	Synchronous Rectifier	Output Configuration	Voltage - Input (Min) [Min]	Voltage - Input (Max) [Max]	Package / Case	Number of Outputs	Mounting Type	Supplier Device Package	Output Type	Frequency - Switching
Texas Instruments LM2757TM/NOPB	Step-Up	180 mA	-30 °C	85 °C	4.1 V 4.5 V 5 V		Positive	2.7 V	5.5 V	12-WFBGA DSBGA	1	Surface Mount	12-DSBGA	Programmable	1.242 MHz
Texas Instruments LM2757TMX/NOPB	Step-Up	180 mA	-30 °C	85 °C	4.1 V 4.5 V 5 V		Positive	2.7 V	5.5 V	12-WFBGA DSBGA	1	Surface Mount	12-DSBGA (1.64x1.24)	Programmable	1.242 MHz

Catalog

Switched Capacitor Boost Regulator with High Impedance Output in Shutdown

Key Features

• Dual Gain Converter (2×, 3/2×) With up to 93%EfficiencyInductorless Solution Uses Only 4 Small CeramicCapacitorsTotal Solution Area < 12 mm2True Input-Output and Output-Input DisconnectUp to 180-mA Output Current Capability (5 V)Selectable 4.1-V, 4.5-V or 5-V OutputPre-Regulation Minimizes Input Current Ripple1.24-MHz Switching Frequency for Low-Noise,Low-Ripple Output VoltageIntegrated Overcurrent and Thermal ShutdownProtectionDual Gain Converter (2×, 3/2×) With up to 93%EfficiencyInductorless Solution Uses Only 4 Small CeramicCapacitorsTotal Solution Area < 12 mm2True Input-Output and Output-Input DisconnectUp to 180-mA Output Current Capability (5 V)Selectable 4.1-V, 4.5-V or 5-V OutputPre-Regulation Minimizes Input Current Ripple1.24-MHz Switching Frequency for Low-Noise,Low-Ripple Output VoltageIntegrated Overcurrent and Thermal ShutdownProtection

Description

The LM2757 is a constant-frequency pre-regulated switched-capacitor charge pump that operates at 1.25 MHz to produce a low-noise regulated output voltage. The device can be configured to provide up to 100 mA at 4.1 V, 110 mA at 4.5 V, or 180 mA at 5 V. Excellent efficiency is achieved without the use of an inductor by operating the charge pump in a gain of either 3/2 or 2 according to the input voltage and output voltage option selection. The LM2757 presents a high impedance at the VOUTpin when shut down. This allows for use in applications that require the regulated output bus to be driven by another supply while the LM2757 is shut down. The LM2757 device comes in a tiny 12-pin 0.4-mm pitch DSBGA package. A perfect fit for space-constrained, battery-operated applications, the device requires only 4 small, inexpensive ceramic capacitors. Built-in soft-start, overcurrent protection, and thermal shutdown features are also included in this device. The LM2757 is a constant-frequency pre-regulated switched-capacitor charge pump that operates at 1.25 MHz to produce a low-noise regulated output voltage. The device can be configured to provide up to 100 mA at 4.1 V, 110 mA at 4.5 V, or 180 mA at 5 V. Excellent efficiency is achieved without the use of an inductor by operating the charge pump in a gain of either 3/2 or 2 according to the input voltage and output voltage option selection. The LM2757 presents a high impedance at the VOUTpin when shut down. This allows for use in applications that require the regulated output bus to be driven by another supply while the LM2757 is shut down. The LM2757 device comes in a tiny 12-pin 0.4-mm pitch DSBGA package. A perfect fit for space-constrained, battery-operated applications, the device requires only 4 small, inexpensive ceramic capacitors. Built-in soft-start, overcurrent protection, and thermal shutdown features are also included in this device.