lm2787tpx National Semiconductor Corporation, lm2787tpx Datasheet

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lm2787tpx

Manufacturer Part Number
lm2787tpx
Description
Low Noise Regulated Switched Capacitor Voltage Inverter In Micro Smd
Manufacturer
National Semiconductor Corporation
Datasheet
© 2003 National Semiconductor Corporation
LM2787
Low Noise Regulated Switched Capacitor Voltage
Inverter in micro SMD
General Description
The LM2787 CMOS Negative Regulated Switched Capacitor
Voltage Inverter delivers a very low noise adjustable output
for an input voltage in the range of +2.7V to +5.5V. Four low
cost capacitors are used in this circuit to provide up to 10mA
of output current. The regulated output for the LM2787 is
adjustable between −1.5V and −5.2V. The LM2787 operates
at 260 kHz (typical) switching frequency to reduce output
resistance and voltage ripple. With an operating current of
only 400 µA (charge pump power efficiency greater than
90% with most loads) and 0.05 µA typical shutdown current,
the LM2787 provides ideal performance for cellular phone
power amplifier bias and other low current, low noise nega-
tive voltage needs. The device comes in small 8-Bump micro
SMD and thin micro SMD packages.
Typical Application Circuit and Connection Diagram
DS101313
8-Bump micro SMD (Top View)
Features
n Inverts and regulates the input supply voltage
n Small 8-Bump micro SMD and thin micro SMD
n 91% typical charge pump power efficiency at 10mA
n Low output ripple
n Shutdown lowers Quiescent current to 0.05 µA (typical)
Applications
n Wireless Communication Systems
n Cellular Phone Power Amplifier Biasing
n Interface Power Supplies
n Handheld Instrumentation
n Laptop Computers and PDA’s
packages
10131302
10131325
www.national.com
April 2003

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lm2787tpx Summary of contents

Page 1

... The device comes in small 8-Bump micro SMD and thin micro SMD packages. Typical Application Circuit and Connection Diagram © 2003 National Semiconductor Corporation Features n Inverts and regulates the input supply voltage n Small 8-Bump micro SMD and thin micro SMD ...

Page 2

... Device Order Number LM2787BP LM2787BPX Thin micro SMD Device Order Number LM2787TP LM2787TPX Note: * The small physical size of the micro SMD package does not allow for the full part number marking. Devices will be marked with the desig- nation shown in the column Package Marking. ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V to GND or GND IN to OUT and V Continuous Output NEG OUT Current ...

Page 4

Typical Performance Characteristics Output Voltage vs. Output Current Maximum V Current vs. Input Voltage NEG www.national.com FIGURE 1. Standard Application Circuit Unless otherwise specified, T Output Voltage vs. Input Voltage 10131305 No Load Supply Current vs. Input Voltage 10131308 4 ...

Page 5

Typical Performance Characteristics −2.5V. (Continued) Switching Frequency vs. Input Voltage Start-up Time vs. Input Voltage Output Ripple Unless otherwise specified, T 10131311 Start-up from Shutdown (no load) 10131310 Output Noise Spectrum 10131313 5 = 25˚ OUT V ...

Page 6

Typical Performance Characteristics −2.5V. (Continued) Line Transient Response Functional Block Diagram www.national.com Unless otherwise specified, T Load Transient Response 10131317 FIGURE 2. Functional Block Diagram 6 = 25˚ OUT 10131318 10131327 ...

Page 7

Device Description The LM2787 is an inverting, regulated charge-pump power converter. It features low noise, small physical size, and is simple to use ideal solution for biasing GaAsFET devices such as power amplifier modules found in portable ...

Page 8

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) 8-Bump micro SMD NS Package Number BPA08CCB For Ordering, Refer to Ordering Information Table X = 1.346 X = 1.346 X = 0.850 8-Bump thin micro SMD NS Package ...

Page 9

... 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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