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The LT3970IDDB-3.3 is an adjustable frequency monolithic buck switch mode regulator that accepts an input voltage range up to 40V and consumes only 2.5μA of quiescent current. The bare die includes an efficient switch, flyback diode, boost diode, and the necessary oscillator, control, and logic circuits. In typical applications, low-ripple burst mode maintains high efficiency at low output currents while keeping output ripple below 5mV. A current-mode topology is used to achieve fast transient response and good loop stability. The current-limiting value of the current-limiting diode provides protection against short-circuit output and overvoltage conditions. An enable pin with an accurate threshold is provided, generating a low shutdown current of 0.7μA. When VOUT reaches 90% of the programmed output voltage, the power supply is indicated as normal.

LT3970IDDB-3.3 Features

Low ripple Burst Mode® operation

2.5μA IQ at 12 VIN to 3.3VOUT

Output ripple < 5mVP-P

Wide input voltage range: operating voltage from 4.2V to 40V

Adjustable switching frequency: 200kHz to 2.2MHz

Integrated boost and flyback diodes

350 mA output current

Fixed output voltages: 3.3V, 3.42V, 5V

1.8μA IQ at 12VIN

Precise 1V enable pin threshold

Low shutdown current: IQ = 0.7μA

Internal detection limits flyback diode current

Power good indicator

Output voltage: 1.21V to 25V  

Internal compensation  

Small 10-pin (3mm × 2mm) DFN package  

Compliant with AEC-Q100 standards for automotive applications

LT3970IDDB-3.3 Specifications

Input voltage range:    4.2V to 40V

Output voltage:    3.3V (fixed)

Output current:    350mA (typical)

Quiescent current (IQ):    2.5μA (typical)

Switching frequency:    200kHz to 2.25MHz (adjustable)

Operating Temperature:    -40°C to +125°C

Package:    10-DFN (3×2mm)

Synchronous Rectification:    None

Topology:    Buck (Step-Down)

LT3970IDDB-3.3 Applications

Automotive Battery Regulation

Portable Product Power Supplies

Industrial Power Supplies

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