lm2788mmx-1.8 National Semiconductor Corporation, lm2788mmx-1.8 Datasheet

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lm2788mmx-1.8

Manufacturer Part Number
lm2788mmx-1.8
Description
120ma High Efficiency Step-down Switched Capacitor Voltage Converter
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2002 National Semiconductor Corporation
LM2788
120mA High Efficiency Step-Down Switched Capacitor
Voltage Converter
General Description
The LM2788 switched capacitor step-down DC/DC con-
verter efficiently produces a 120mA regulated low-voltage
rail from a 2.6V to 5.5V input. Fixed output voltage options of
1.5V, 1.8V, and 2.0V are available. The LM2788 uses mul-
tiple fractional gain configurations to maximize conversion
efficiency over the entire input voltage and output current
ranges. Also contributing to high overall efficiency is the
extremely low supply current of the LM2788: 32µA operating
unloaded and 0.1µA in shutdown.
The optimal external component requirements of the
LM2788 solution minimize size and cost, making the part
ideal for Li-Ion and other battery powered designs. Two 1µF
flying capacitors and two 10µF bypass capacitors are all that
are required, and no inductors are needed.
The LM2788 also features noise-reducing soft-start circuitry,
short-circuit protection and over-temperature protection.
Typical Application Circuit
DS200444
Features
n Output voltage options:
n 120mA output current capability
n Multi-Gain and Gain Hopping for Highest Possible
n 2.6V to 5.5V input range
n Low operating supply current: 32µA
n Shutdown supply current: 0.1µA
n Thermal and short circuit protection
n Available in an 8-Pin MSOP Package
Applications
n Cellular Phones
n Pagers
n H/PC and P/PC Devices
n Portable Electronic Equipment
n Handheld Instrumentation
Efficiency - up to 90% Efficient
2.0V
±
5%, 1.8V
±
5%, 1.5V
±
6%
October 2002
www.national.com
20044401

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lm2788mmx-1.8 Summary of contents

Page 1

... The LM2788 also features noise-reducing soft-start circuitry, short-circuit protection and over-temperature protection. Typical Application Circuit © 2002 National Semiconductor Corporation Features n Output voltage options: ± 2.0V 5%, 1 ...

Page 2

... GND 8 C2- Ordering Information Output Ordering Voltage Information 1.50V LM2788MM-1.5 LM2788MMX-1.5 1.80V LM2788MM-1.8 LM2788MMX-1.8 2.00V LM2788MM-2.0 LM2788MMX-2.0 www.national.com LM2788 Mini SO-8 (MSOP-8) Package NS Package #: MUA08A 20044402 Top View Description Regulated Output Voltage First Flying Capacitor: Negative Terminal First Flying Capicitor: Positive terminal Input voltage ...

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 pins: Voltage to Ground IN (Note 3) Junction Temperature (T ) J-MAX-ABS Continuous Power Dissipation ...

Page 4

Electrical Characteristics Limits in boldface type apply over the operating junction temperature range. Unless otherwise specified: 2.6 ≤ V V(EN 1µ Note 4: Thermal shutdown circuitry ...

Page 5

Typical Performance Characteristics Unless otherwise specified 10µ 1.0µ 1.0µ ceramic capacitors (MLCC’s). Output Voltage vs. Input Voltage: LM2788-1.5 (1mA) Output Voltage vs. Input Voltage: LM2788-1.8 (1mA) Output Voltage vs. Input Voltage: LM2788-2.0 ...

Page 6

Typical Performance Characteristics Efficiency vs. Input Voltage: LM2788-1.5 Efficiency vs. Input Voltage: Lm2788-1.8 Efficiency vs. Input Voltage: LM2788-2.0 www.national.com (Continued) Efficiency vs. Output Current: LM2788-1.5 20044413 Efficiency vs. Output Current: LM2788-1.8 20044415 Effiency vs. Output Current: LM2788-2.0 20044417 6 20044414 ...

Page 7

Typical Performance Characteristics Output Voltage Ripple vs. Output Current Output Voltage Ripple Start Up Waveform (Continued) Output Voltage Ripple vs. Input Voltage 20044421 Short Circuit Current 20044406 Transient Load Response 20044404 7 20044419 20044420 20044405 www.national.com ...

Page 8

Operation Description OVERVIEW The LM2788 is a switched capacitor converter that produces a regulated low-voltage output. The core of the part is the highly efficient charge pump that utilizes multiple fractional gains and pulse-frequency modulated (PFM) switching to minimize power ...

Page 9

Operation Description holds true for the other base-gain regions. At the base-gain transitions (V = 2.9V, 3.8V), the 10mA curve makes sharps IN transition as the part switches base-gains. The 10mA load curve gives a clear picture of how base-gain ...

Page 10

Application Information low-ESR ceramic capacitor is recommended on the output to keep output voltage ripple low. Placing multiple capacitors in parallel can reduce ripple significantly, both by increasing capacitance and reducing ESR. When capacitors are in parallel, ESR is in ...

Page 11

Application Information Even under these peak power dissipation and ambient tem- perature conditions, the junction temperature of the LM2788 is below the maximum operating rating of 125˚ additional note, the ambient temperature operating rating range listed in the ...

Page 12

... 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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