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.

• 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.

• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 1
• Vout (Max) (V)
• 2
• Iout (Max) (A)
• 0.6
• Iq (Typ) (uA)
• 600
• Switching frequency (Min) (kHz)
• 1500
• Switching frequency (Max) (kHz)
• 2400
• Features
• Enable, I2C/PMBus, Light Load Efficiency, Synchronous Rectification, Adaptive/Dynamic Voltage Scaling
• Rating
• Catalog
• Regulated outputs (#)
• 2
• Control mode
• Voltage Mode
• Duty cycle (Max) (%)
• 100

LM3370的完整型号有：LM3370SD-3013/NOPB、LM3370SD-3021/NOPB、LM3370SD-3416/NOPB、LM3370SD-4221/NOPB、LM3370SDX-3013/NOPB、LM3370SDX-4221/NOPB、LM3370TL-3006/NOPB、LM3370TL-3022/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3370SD-3013/NOPB，工作温度：-30 to 85，封装：WSON (NHR)-16，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3370SD-3013/NOPB的批量USD价格：.697（1000+）

LM3370SD-3021/NOPB，工作温度：-30 to 85，封装：WSON (NHR)-16，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3370SD-3021/NOPB的批量USD价格：.581（1000+）

LM3370SD-3416/NOPB，工作温度：-30 to 85，封装：WSON (NHR)-16，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3370SD-3416/NOPB的批量USD价格：.581（1000+）

LM3370SD-4221/NOPB，工作温度：-30 to 85，封装：WSON (NHR)-16，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3370SD-4221/NOPB的批量USD价格：.697（1000+）

LM3370SDX-3013/NOPB，工作温度：-30 to 85，封装：WSON (NHR)-16，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3370SDX-3013/NOPB的批量USD价格：.581（1000+）

LM3370SDX-4221/NOPB，工作温度：-30 to 85，封装：WSON (NHR)-16，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3370SDX-4221/NOPB的批量USD价格：.581（1000+）

LM3370TL-3006/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-20，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3370TL-3006/NOPB的批量USD价格：.668（1000+）

LM3370TL-3022/NOPB，工作温度：PropertyValue，封装：DSBGA (YZR)-20，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3370TL-3022/NOPB的批量USD价格：.668（1000+）

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice

PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助?PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

在?PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)