Low

LINEAR TECHNOLOGY  LT3991EMSE#PBF  DC-DC Switching Buck (Step Down) Regulator, Adjustable, 4.3V-55Vin, 1.19V-30Vout, 1.2Aout, MSOP-10

LINEAR TECHNOLOGY LT3991EMSE#PBF
Manufacturer Part No:
LT3991EMSE#PBF
Order Code:
1839167
Technical Datasheet:
See all Technical Docs

Image is for illustrative purposes only. Please refer to product description.

Product Overview

The LT3991EMSE#PBF is a 1.2A monolithic step-down Switching Regulator accepts two input voltages up to 55V. Low quiescent current design consumes only 2.8µA of supply current while regulating with no load. Low ripple Burst Mode® operation maintains high efficiency at low output currents while keeping the output ripple below 15mV in a typical application. An internally compensated current mode topology is used for fast transient response and good loop stability. A high efficiency 0.44R switch is included on the die along with a boost Schottky diode and the necessary oscillator, control and logic circuitry. An accurate 1V threshold enable pin can be used to shut down the LT3991, reducing the input supply current to 700nA. A capacitor on the SS pin provides a controlled inrush current (soft-start). A power good flag signals when VOUT reaches 91% of the programmed output voltage.
  • Ultralow quiescent current (2.8µA IQ regulating 12VIN to 3.3VOUT)
  • Fixed output voltages (3.3, 5V 2.1µA IQ Regulating 12VIN)
  • Low ripple Burst Mode® operation (output ripple <15mVP-P)
  • 200kHz to 2MHz Adjustable switching frequency
  • Synchronizable between 250kHz to 2MHz
  • Fast transient response
  • Accurate 1V enable pin threshold
  • Low shutdown current (IQ = 700nA)
  • Power good flag
  • Soft-start capability
  • Internal compensation
  • Saturating switch design (0.44R on-resistance)

Product Information

Topology:
Buck (Step Down)
Input Voltage Min:
4.3V
Input Voltage Max:
55V
No. of Outputs:
1Outputs
DC / DC Converter IC Case:
MSOP
No. of Pins:
10Pins
Output Current:
1.2A
Output Voltage Min:
1.19V
Output Voltage Max:
30V
Switching Frequency:
2MHz
Operating Temperature Max:
125°C
Packaging:
Cut Tape
Product Range:
-
Automotive Qualification Standard:
-
MSL:
MSL 1 - Unlimited
SVHC:
No SVHC (17-Dec-2015)

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Applications

  • Automotive
  • Portable Devices
  • Industrial
  • Power Management

Legislation and Environmental

Country of Origin:
United States

Country in which last significant manufacturing process was carried out

RoHS Compliant:
Yes
Tariff No:
85423990
Weight (kg):
.000091

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