Low-Noise Regulated Switched Capacitor Voltage Inverter - LM27761

LM27761 (ACTIVE)

Low-Noise Regulated Switched Capacitor Voltage Inverter

 

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.

For all available packages, see the orderable addendum at the end of the data sheet.

Features

  • 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, 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 = –5 V
  • Current Limit and Thermal Protection
  • Create a Custom Design Using the LM27761 With the WEBENCH Power Designer

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Parametrics Compare all products in Buck/Boost or Inverting Charge Pump (Inductorless)

 
Topology
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Operating Temperature Range (C)
Rating
Package Group
LM27761 LM27762
Inverting    Buck/Boost
Inverting   
2.7    2.7   
5.5    5.5   
-1.5    1.5   
-5.2    5   
0.25    0.25   
1700    1800   
2300    2200   
0.37    0.39   
Enable
Integrated LDO   
Enable
Integrated LDO
Multiple Outputs
Power Good   
-40 to 85    -40 to 85   
Catalog    Catalog   
WSON    WSON   
New! Interactive Design
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WEBENCH® Designer LM27761

  Min   Max Range
Vin  V 2.7 to 5.5V
Vout  V -5 to -1.5V
Iout  A ≤ 0.25A
Ambient Temp  °C -4 to 125°C


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