Texas Instruments LM3687
The LM3687 is a step-down DC-DC converter with an integrated low dropout Linear Regulator optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides a dual output with fixed output voltages and combined load current up to 750mA in post regulation mode or 1100mA in independent mode of operation, over an input voltage range from 2.7V to 5.5V. The Linear Regulator being driven from the fixed output voltage of the buck converter (post regulation) translates to high efficiency.| Part No. | LM3687 |
|---|---|
| Datasheet | LM3687 Download |
| Manufacturer |  Texas Instruments |
| Description | Step-Down DC-DC Converter |
| Buy | Stock & Price |
FEATURES
1 2DC-DC Converter:● 750mA Maximum Load Capability
● 1.8MHz PWM Fixed Switching Frequency (Typ.)
● Automatic PFM/PWM Mode Switching
● 27µA typ. Quiescent Current
● Internal Synchronous Rectification for High Efficiency
● Internal Soft Start Dual Rail Linear Regulator:
● Startup Mode
● Load Transients < 25mVpeak Typ.
● Line Transients < 1mVpeak Typ.
● Very Low Dropout Voltage: 82mV Typ. at 350mA Load Current
● 0.7V ≤ VIN_LIN ≤ 4.5V
● 10µA Typical IQ from VIN_LIN
● 350mA Maximum Load Capability Combined Common
FEATURES
:● 65µA typical Quiescent Current from VBATT if Both Regulators are Enabled
● 750mA Maximum Combined Load Capability in Post Regulation Setup (DC-DC 400mA + Linear Regulator 350mA)
● 1100mA Maximum Total Load Capability in Independent Mode of Operation (DC-DC: 750mA, Linear Regulator: 350mA)
● Operates from a Single Li-Ion Cell or 3 Cell NiMH/NiCd Batteries
● Only Four Tiny Surface-Mount External Components Required (One Inductor, Three Ceramic Capacitors)
● Smal...
