LM27762 Datasheet, PDF (1/7 Pages) Texas Instruments – LM27762 Low-Noise Positive and Negative Output Integrated Switched Capacitor Plus LDO

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LM27762
SNVSAF7 – JULY 2016
LM27762 Low-Noise Positive and Negative Output Integrated
Switched Capacitor Plus LDO
1 Features
•1 Generates Low-Noise Adjustable Positive and
Negative Supply Voltages From ±1.5 V and ±5 V
• Input Voltage Range 2.7 V to 5.5 V
• ±250-mA Output Current
• Inverting Charge Pump Followed by Negative
LDO
• 2-MHz Low-Noise Fixed-Frequency Operation
• 2.5-Ω Inverter Output Impedance, V_IN = 5 V
• LDO Dropout Voltage 30 mV at 100 mA,
V_OUT = –5 V
• 390-µA Quiescent Current
• Shutdown Quiescent Current to 0.5 µA (Typical)
• Current Limit and Thermal Protection
• Power Good pin (Active Low)
2 Applications
• Hi-Fi Audio Headphone Amplifiers
• Operational Amplifier Power Biasing
• Powering Data Converters
• Wireless Communication Systems
• Interface Power Supplies
• Handheld Instrumentation
3 Description
The LM27762 delivers very low-noise positive and
negative outputs that are adjustable between ±1.5 V
and ±5 V. Input-voltage range is from 2.7 V to 5.5 V,
and output current goes up to ±250 mA. The device
provides a small solution size with few external
components.
Negative voltage is generated by a regulated
switched-capacitor voltage inverter followed by a low-
noise negative LDO. The switched-capacitor voltage
inverter of the LM27762 device operates at 2-MHz
(typical) switching frequency to reduce output
resistance and voltage ripple. Positive voltage is
generated from the input by a low-noise positive
LDO. With an operating current of only 390 µA and
0.5-µA typical shutdown current, the LM27762
provides ideal performance for power amplifier and
DAC bias and other high-current, low-noise negative
voltage needs.
Positive and negative outputs of LM27762 have
dedicated enable inputs. These outputs support
independent timing for the positive and negative rails
for specific system power-sequence needs. Enable
inputs can be also shorted together and connected to
the input voltage. The LM27762 has an optional
Power Good feature.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM27762
WSON (12)
2.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
2.7 V to 5.5 V
VIN
CVIN
RPU
PGOOD
C1-
C1
C1+
EN+
EN-
LM27762
CP
1.5 V to 5 V
OUT+
R1
FB+
R2
GND
R4
FB-
OUT-
R3
-1.5 V to -5 V
CCP
COUT+
COUT-
Copyright © 2016, Texas Instruments Incorporated
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.