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AC/DC 和 DC/DC 轉換器 (整合式 FET)

LM8850

現行

適用行動裝置中高功率應用的高性能、升壓 DC-DC 轉換器

立即訂購
產品規格表

LM8850

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost Type Converter Vin (min) (V) 2.3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1600 Switching frequency (max) (kHz) 2750 Features Enable, Synchronous Rectification Vout (min) (V) 3.6 Vout (max) (V) 5.7 Iq (typ) (µA) 6 Duty cycle (max) (%) 60 Switch current limit (typ) (A) 1
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Boost Type Converter Vin (min) (V) 2.3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1600 Switching frequency (max) (kHz) 2750 Features Enable, Synchronous Rectification Vout (min) (V) 3.6 Vout (max) (V) 5.7 Iq (typ) (µA) 6 Duty cycle (max) (%) 60 Switch current limit (typ) (A) 1
DSBGA (YPD) 9 3.0625 mm² 1.75 x 1.75
  • 6µA typ. Quiescent Current
  • VOUT = 3.6V to 5.7V (max VO = 5.7V)
  • Operates from a Single Lithium Ion Cell (2.3V to 5.5V)
  • 8 User-selectable Output Voltages via I2C
  • High-speed 3.4 MHz I2C-compatible Interface
  • Up to 1.0A Maximum Load Current Capability
  • 4 Levels of Current Limiting
  • Auto-mode Operation and Forced PWM
  • 2.5 MHz Switching Drequency (typ.)
  • ±2.5% DC Output Voltage Precision
  • 1.0 µH Inductor (2520 Case Size)
  • 4.7 µF Input and Output Capacitors (0603 case size)
  • PGOOD Signal
  • True Shutdown Isolation
  • Output Over-voltage Protection
  • Internal Active Voltage Balancing for Supercapacitors
  • DSBGA 9-bump Package
    • (1.58 mm x 1.62 mm x 0.35 mm)(0.5 mm pitch)

All trademarks are the property of their respective owners.

  • 6µA typ. Quiescent Current
  • VOUT = 3.6V to 5.7V (max VO = 5.7V)
  • Operates from a Single Lithium Ion Cell (2.3V to 5.5V)
  • 8 User-selectable Output Voltages via I2C
  • High-speed 3.4 MHz I2C-compatible Interface
  • Up to 1.0A Maximum Load Current Capability
  • 4 Levels of Current Limiting
  • Auto-mode Operation and Forced PWM
  • 2.5 MHz Switching Drequency (typ.)
  • ±2.5% DC Output Voltage Precision
  • 1.0 µH Inductor (2520 Case Size)
  • 4.7 µF Input and Output Capacitors (0603 case size)
  • PGOOD Signal
  • True Shutdown Isolation
  • Output Over-voltage Protection
  • Internal Active Voltage Balancing for Supercapacitors
  • DSBGA 9-bump Package
    • (1.58 mm x 1.62 mm x 0.35 mm)(0.5 mm pitch)

All trademarks are the property of their respective owners.

LM8850 is a step-up DC-DC converter optimized for use with a supercapacitor to protect a battery from power surges and enable new high power applications in mobile device architectures. The device creates an ideal rail from 3.6V to 5.7V boosting from a single Li-Ion cell with an input voltage range of 2.3V to 5.5V; Target VOUT must be at least 10% higher than VIN.

An I2C interface controlling multiple output voltage settings, input current limits, and load currents up to 1A provides superior user flexibility. The LM8850 operates in Auto mode, where the converter is in PFM mode at light loads and switches to PWM mode at heavy loads. Hysteretic PFM extends the battery life by reduction of the quiescent current to 6µA (typ.) during light load and standby conditions. Synchronous operation provides true shutdown isolation and improves its efficiency at medium-to-full load conditions.

High-switching frequency enables smaller passive components. Internal compensation is used for a broader range of inductor and output capacitor values to meet system demand and achieve small system solution size.

LM8850 is available in a 9-bump ultra-thin DSBGA package. Only four external surface-mount components, a 1.0 µH inductor, a 4.7 µF for input capacitor, 4.7 µF for output capacitor and 0.05F-1.0F supercapacitor for energy storage are required.

LM8850 is a step-up DC-DC converter optimized for use with a supercapacitor to protect a battery from power surges and enable new high power applications in mobile device architectures. The device creates an ideal rail from 3.6V to 5.7V boosting from a single Li-Ion cell with an input voltage range of 2.3V to 5.5V; Target VOUT must be at least 10% higher than VIN.

An I2C interface controlling multiple output voltage settings, input current limits, and load currents up to 1A provides superior user flexibility. The LM8850 operates in Auto mode, where the converter is in PFM mode at light loads and switches to PWM mode at heavy loads. Hysteretic PFM extends the battery life by reduction of the quiescent current to 6µA (typ.) during light load and standby conditions. Synchronous operation provides true shutdown isolation and improves its efficiency at medium-to-full load conditions.

High-switching frequency enables smaller passive components. Internal compensation is used for a broader range of inductor and output capacitor values to meet system demand and achieve small system solution size.

LM8850 is available in a 9-bump ultra-thin DSBGA package. Only four external surface-mount components, a 1.0 µH inductor, a 4.7 µF for input capacitor, 4.7 µF for output capacitor and 0.05F-1.0F supercapacitor for energy storage are required.

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類型 標題 日期
* Data sheet High-Performance, Step-Up DC-DC Converter for High-Power Apps in Mobile Devices datasheet (Rev. C) 2013年 5月 3日
White paper The Forgotten Converter 2015年 6月 15日
User guide AN-2119 LM8850 Evaluation Board AN- (Rev. A) 2013年 5月 3日

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