LM2760M5X National Semiconductor, LM2760M5X Datasheet

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LM2760M5X

Manufacturer Part Number
LM2760M5X
Description
3.3V Regulated Switched Capacitor Voltage Converter
Manufacturer
National Semiconductor
Datasheet
© 2002 National Semiconductor Corporation
LM2760
3.3V Regulated Switched Capacitor Voltage Converter
General Description
The LM2760 is a switched-capacitor DC/DC converter that
generates a regulated 3.3V output capable of driving a load
up to 20mA (V
(2.0V-4.4V) allows this device to be powered from several
types of batteries, including single cell lithium-ion, two-cell
alkaline, nickel-metal-hydride, and nickel-cadmium. The
LM2760 solution does not require an inductor and needs
only three small external ceramic capacitors. The miniscule
quiescent current of the part, typically 10µA unloaded,
makes the LM2760 ideal for low-current standby power rails.
The LM2760 is a switched-capacitor circuit that is controlled
by a gated oscillator. Both a low-input-voltage boost mode
and high-input-voltage pass mode are implemented to opti-
mize efficiency over the full input voltage range.
Additional features of the LM2760 include thermal protection
and current limiting. The LM2760 is available in a small,
five-pin SOT-23 package.
Typical Application Circuit
IN
≥ 2.5V). The wide input voltage range
DS200443
Features
n 3.3V
n Ultralow Power: 10µA Typical Supply Current
n Boost and Pass Modes for Improved Efficiency
n Input Voltage Range: 2.0V to 4.4V
n Output Current up to 20mA (V
n Output Current up to 10mA (V
n Inductorless solution
n Small external parts count: 3 ceramic capacitors
n 750kHz Switching Frequency
n SOT23-5 Package
n Short-Circuit and Thermal Protection
Applications
n Battery-Operated Devices
n Cellular Phone
n Standby Power Supply
n Memory Keep-alive Power
±
4% Regulated Output
IN
IN
≥ 2.5V)
≥ 2.0V)
20044301
December 2002
www.national.com

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LM2760M5X Summary of contents

Page 1

... Additional features of the LM2760 include thermal protection and current limiting. The LM2760 is available in a small, five-pin SOT-23 package. Typical Application Circuit © 2002 National Semiconductor Corporation Features ± n 3.3V 4% Regulated Output n Ultralow Power: 10µA Typical Supply Current n Boost and Pass Modes for Improved Efficiency n Input Voltage Range: 2 ...

Page 2

... GND 3 V OUT 4 CAP+ 5 CAP- Ordering Information Order # Package Type LM2760M5 LM2760M5X www.national.com LM2760 SOT23-5 Package NS Package Number MF05A Top View Input supply connection Ground connection Regulated 3.3V output Charge pump capacitor (+) connection Charge pump capacitor (-) connnection Package Marking SOT23-5 S19B ...

Page 3

... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V Pin: Voltage to GND IN Junction Temperature (T ) J-MAX-ABS Continuous Power Dissipation (Note 3) V Short-Circuit to GND Duration OUT (Note 4) Storage Temperature Range Lead Temperature (Soldering, 5 sec ...

Page 4

Electrical Characteristics Note 11: In determining quiescent supply current limits, the voltage on the V inactive and all internal switches are off. Note 12: The "normal operation" supply current specification is a measure of the time-averaged supply current when there ...

Page 5

Typical Performance Characteristics 4.7µ 0.1µ 10µF. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC’s). FLY OUT Output Voltage vs. Input Voltage Power Efficiency Short Circuit Current vs. Input Voltage Unless otherwise specified: V Output Voltage vs. Output ...

Page 6

Typical Performance Characteristics 4.7µ 0.1µ 10µF. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC’s). (Continued) FLY OUT Output Voltage Ripple www.national.com Unless otherwise specified: V Load Step Response 20044312 3.0V ...

Page 7

Operation Description OVERVIEW The LM2760 is a regulated switched capacitor converter that efficiently provides a regulated 3.3V output capable of sup- plying a load up to 20mA. The part has two regulation modes: a doubler mode and a pass mode. ...

Page 8

Application Information is illustrated in Figure 1, which graphs of output voltage ripple versus input voltage for a few different output capaci- tor values. FIGURE 1. Output Voltage Ripple vs. Input Voltage ...

Page 9

Application Information 1mA). The simplified power model of the LM2760, in Figure 2, will be used to discuss power efficiency and power dissi- pation. FIGURE 2. LM2760 Power Model In calculating power efficiency, output power (P determined as the product ...

Page 10

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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