LM27761_15 Datasheet, PDF (1/9 Pages) Texas Instruments – LM27761 Low-Noise Regulated Switched-Capacitor Voltage Inverter

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LM27761
SNVSA85 – OCTOBER 2015
LM27761 Low-Noise Regulated Switched-Capacitor Voltage Inverter
1 Features
•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-Ω Inverter Output Impedance, V_IN = 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,
V_OUT = –5 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 −1.5 V and −5 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 × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
C1
2.2 µF
C2
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. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.