LM27761 (ACTIVE)

Low-Noise Regulated Inverter with Integrated LDO

Low-Noise Regulated Inverter with Integrated LDO - LM27761
 

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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.

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 LM2776 LM27762
Inverting    Inverting    Split-Rail   
2.7    2.7    2.7   
5.5    5.5    5.5   
-5.2    -5.5    -5   
-1.5    -2.7    5   
0.25    0.2    0.25   
1700    1700    1800   
2300    2300    2200   
0.37    0.1    0.39   
Enable
Integrated LDO
Light Load Efficiency Mode
Output Discharge
Synchronous Rectification
UVLO Fixed   
Enable
Light Load Efficiency Mode
Output Discharge
Synchronous Rectification
UVLO Fixed   
Enable
Integrated LDO
Light Load Efficiency Mode
Multiple Outputs
Output Discharge
Power Good
Synchronous Rectification   
-40 to 85    -40 to 85    -40 to 85   
Catalog    Catalog    Catalog   
WSON    SOT-23    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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