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LM27761_16 Datasheet, PDF (1/29 Pages) Texas Instruments – Low-Noise Regulated Switched-Capacitor Voltage Inverter | |||
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LM27761
SNVSA85B â OCTOBER 2015 â REVISED FEBRUARY 2016
LM27761 Low-Noise Regulated Switched-Capacitor Voltage Inverter
1 Features
â¢1 Inverts and Regulates the Input Supply Voltage
⢠Low Output Ripple
⢠Shutdown Lowers Quiescent Current to 7 µA
(Typical)
⢠Up to 250-mA Output Current
⢠2.5-⦠Inverter Output Impedance, VIN = 5 V
⢠±4% Regulation at Peak Load
⢠370-µA Quiescent Current
⢠2-MHz (Typical) Low-Noise Fixed-Frequency
Operation
⢠35-dB (Typical) LDO PSRR at 2 MHz
With 80-mA Load Current
⢠30-mV LDO Dropout Voltage at 100 mA,
VOUT = â5 V
⢠Current Limit and Thermal Protection
2 Applications
⢠Operational Amplifier Power
⢠Wireless Communication Systems
⢠Cellular-Phone Power-Amplifier Biasing
⢠Interface Power Supplies
⢠Handheld Instrumentation
⢠Hi-Fi Headphone Amplifiers
⢠Powering Data Converters
3 Description
The LM27761 low-noise regulated switched-capacitor
voltage inverter delivers a very low-noise adjustable
output for an input voltage in the range of 2.7 V to
5.5 V. Four low-cost capacitors are used in the
application solution to provide up to 250 mA of output
current. The regulated output for the device is
adjustable between â1.5 V and â5 V. The LM27761
operates at 2-MHz (typical) switching frequency to
reduce output resistance and voltage ripple. With an
operating current of only 370 µA (charge-pump power
efficiency greater than 80% with most loads) and
7-µA typical shutdown current, the LM27761 provides
ideal performance when driving power amplifiers,
DAC bias rails, and other high-current, low-noise
voltage applications.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM27761
WSON (8)
2.00 mm à 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
C2
4.7 µF
C1
1 µF
LM27761
VIN
VOUT
EN
VFB
C1+
CPOUT
C1-
GND
R1
R2
C3
4.7 µF
C4
2.2 µF
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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