LM2787_15 Datasheet, PDF (1/9 Pages) Texas Instruments – LM2787 Low Noise Regulated Switched Capacitor Voltage Inverter in DSBGA

LM2787
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SNVS080F – JULY 2001 – REVISED MAY 2013
LM2787 Low Noise Regulated Switched Capacitor Voltage Inverter in DSBGA
Check for Samples: LM2787
FEATURES
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•2 Inverts and Regulates the Input Supply
Voltage
• Small 8-Bump DSBGA and Thin DSBGA
Packages
• 91% Typical Charge Pump Power Efficiency at
10mA
• Low Output Ripple
• Shutdown Lowers Quiescent Current to 0.05
µA (Typical)
APPLICATIONS
• Wireless Communication Systems
• Cellular Phone Power Amplifier Biasing
• Interface Power Supplies
• Handheld Instrumentation
• Laptop Computers and PDA's
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 negative voltage
needs. The device comes in small 8-Bump DSBGA
and thin DSBGA packages.
Typical Application Circuit and Connection Diagram
8-Bump DSBGA (Top View)
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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