The LM3686 is a step-down DC-DC converter with a very low-dropout linear regulator and a low-noise linear regulator optimized for powering ultra-low voltage circuits. It provides three outputs with combined load current up to 900 mA over an input voltage range from 2.7 V to 5.5 V.

The device offers superior features and performance for many applications. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During full-power operation, a fixed-frequency 3 MHz (typical), PWM mode drives loads from approximately 70 mA to 600 mA maximum. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 28 μA (typical) at light load and system standby. Internal synchronous rectification provides high efficiency.

For all available packages, see the orderable addendum at the end of the data sheet.

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Three enable (EN_x) pins allow the separate operation of either the DC-DC, post-regulation linear regulator, or the linear regulator alone. If the DC-DC is not enabled during start-up of the post-regulation linear regulator, a parallel small-pass transistor supplies the linear regulator from V_BATT with maximal 50 mA. In the combined operation where both enables are raised together, the small-pass transistor is deactivated and the big pass transistor provides 350 mA output current. In shutdown mode (EN_x pins pulled low), the device turns off and reduces battery consumption to 2.5 μA (typical).

The LM3686 is available in a 12-pin DSBGA package. A high-switching frequency of 3 MHz (typical) allows the use of a few tiny surface-mount components. Only six external surface-mount components, an inductor and five ceramic capacitors, are required to establish a 15.66 mm² total solution size.

• DC-DC Regulator
  • VOUT_DCDC = 1.2 V to 2.5 V
  • 600-mA Maximum ILOAD
  • 3-MHz Typical PWM Fixed Switching Frequency
  • Automatic PFM/PWM Mode Switching
  • Internal Synchronous Rectification
  • Internal Soft Start
• Dual-Rail Linear Regulator: LILO
  • Load Transients < 50-mV Peak Typical
  • Line Transients < 1-mV Peak Typical
  • VOUT_LILO = 0.7 V to 2 V
  • 70-μA Typical IQ and 300-mA Maximum ILOAD
• Linear Regulator: LDO
  • Load Transients < 80-mV Peak Typical
  • Line Transients < 1-mV Peak Typical
  • VOUT_LDO = 1.5 V to 3.3 V
  • 50-μA Typical IQ and 350-mA Maximum ILOAD
• Combined Global Features
  • VBATT ≥ Maximum (VOUT_LILO + 1.5 V, 2.7 V)
  • Operates From a Single Li-Ion Cell or 3-Cell NiMH/NiCd Batteries
  • 100-μA IQ and 900-mA Maximum ILOAD

• Regulated outputs (#)
• 3
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Iout (Max) (A)
• 0.9
• Rating
• Catalog
• LDO
• 2
• Iq (Typ) (mA)
• 0.07
• Features
• —
• Processor name
• Generic
• Processor supplier
• Generic
• Shutdown current (ISD) (Typ) (uA)
• 2.5
• Switching frequency (Typ) (kHz)
• 3000
• Configurability
• Factory programmable

LM3686的完整型号有：LM3686TLE-AADW/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3686TLE-AADW/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-12，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LM3686TLE-AADW/NOPB的批量USD价格：.483（1000+）

LM3686TLE-AADW/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-12，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LM3686TLE-AADW/NOPB的批量USD价格：.483（1000+）