This website uses cookies. By using this site, you consent to the use of cookies. For more information, please take a look at our Privacy Policy.


Conv DC-DC 2.7V to 5.5V Synchronous Step Down Dual-Out 1.2V/3.3V 0.6A/0.6A 16-Pin WSON EP T/R

Inquiry Add To Bom

LM3370SD-3021/NOPB General Description

The LM3370 is a dual step-down DC-DC converter optimized for powering ultra-low voltage circuits from a single Li-Ion battery and input rail ranging from 2.7V to 5.5V. It provides two outputs with 600mA load per channel. The output voltage range varies from 1V to 3.3V and can be dynamically controlled using the I2C-compatible interface. This dynamic voltage scaling function allows processors to achieve maximum performance at the lowest power level. The I2C-compatible interface can also be used to control auto PFM-PWM/PWM mode selection and other performance enhancing features.

The LM3370 offers superior features and performance for portable systems with complex power management requirements. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system efficiency. Internal synchronous rectification enhances the converter efficiency without the use of further external devices.

There is a power-on-reset function that monitors the level of the output voltage to avoid unexpected power losses. The independent enable pin for each output allows for simple and effective power sequencing.

LM3370 is available in a 4mm by 5mm 16-lead non-pullback WSON and a 20-bump DSBGA, 3.0mm x 2.0mm x 0.6mm, package. A high switching frequency—2 MHz (typ)—allows use of tiny surface-mount components including a 2.2μH inductor.

Default fixed voltages for the 2 output voltages combination can be customized to fit system requirements by contacting Texas Instruments.

Texas Instruments, Inc Inventory

Key Features

  • I2C-compatible interface
    • VOUT1 = 1V to 2V in 50 mV Steps
    • VOUT2 = 1.8V to 3.3V in 100 mV Steps
    • Automatic PFM/PWM Mode Switching and Forced PWM Mode for Low Noise Operation
    • Spread Spectrum Capability Using I2C
  • 600mA Load Per Channel
  • 2MHz PWM Fixed Switching Frequency (Typ.)
  • The Bucks Operate 180° Out-of-Phase Timing Offset for Noise and Input Surge Current Abatement
  • Internal Synchronous Rectification for High Efficiency
  • Internal Soft Start
  • Power-on-Reset Function for Both Outputs
  • 2.7V ≤ VIN ≤ 5.5V
  • Operates from a Single Li-Ion Cell or 3 Cell NiMH/NiCd Batteries and 3.3V/5.5V Fixed Rails
  • 2.2μH Inductor, 4.7μF Input and 10μF Output Capacitor Per Channel
  • 16-lead WSON Package (4 mm x 5 mm x 0.8 mm)
  • 20-Bump DSBGA Package (3.0 mm x 2.0 mm x 0.6 mm)

All trademarks are the property of their respective owners.

Texas Instruments, Inc Original Stock
Texas Instruments, Inc Inventory


Category Integrated Circuits (ICs)Power Management (PMIC)Voltage Regulators - DC DC Switching Regulators Mfr Texas Instruments
Series - Package Tape & Reel (TR)Cut Tape (CT)Digi-Reel®
Product Status Active Function Step-Down
Output Configuration Positive Topology Buck
Output Type Fixed Number of Outputs 2
Voltage - Input (Min) 2.7V Voltage - Input (Max) 5.5V
Voltage - Output (Min/Fixed) 1.2V, 3.3V Voltage - Output (Max) -
Current - Output 600mA Frequency - Switching 2MHz
Synchronous Rectifier Yes Operating Temperature -30°C ~ 85°C (TA)
Mounting Type Surface Mount Package / Case 16-WFDFN Exposed Pad
Supplier Device Package 16-WSON (5x4) Base Product Number LM3370

Service Policies and Others

After-Sales & Settlement Related

payment Payment

We accept TT prepayment (bank transfer), paypal, credit cards, Western Union, Money Gram.

If you have specific preferences or requirements for payment channels, please contact our sales team. 

customers are required to pay all possible fees, including sales tax,customs fees, etc.

shipping Shipping And Packing
Shipping Method

Our products are mainly transported and delivered by DHL, FedEx, UPS and other logistics partners on site -- Available to 200+ countries.


AVAQ determines and packages all devices based on electrostatic discharge (ESD) and moisture sensitivity level (MSL) protection requirements.

warranty Warranty & Returns

Our policies and procedures are designed to ensure compliance with various quality specifications and to quickly resolve quality-related issues.

We promise to provide 365 days quality assurance service for all our products.

If you have any dissatisfaction with the quality of the product you received, you can contact us for a refund or exchange, as long as the product is kept in its original condition.


You need to log in to reply. Sign In | Sign Up