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 V_OUT must be at least 10% higher than V_IN.

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.

• 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)

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• Vin (Min) (V)
• 2.3
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 3.6
• Vout (Max) (V)
• 5.7
• Switch current limit (Typ) (A)
• 1
• Regulated outputs (#)
• 1
• Switching frequency (Min) (kHz)
• 1600
• Switching frequency (Max) (kHz)
• 2750
• Iq (Typ) (mA)
• 0.006
• Features
• Synchronous Rectification
• Duty cycle (Max) (%)
• 60
• Rating
• Catalog

LM8850的完整型号有：LM8850URE/NOPB、LM8850URX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM8850URE/NOPB，工作温度：-40 to 125，封装：DSBGA (YPD)-9，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LM8850URE/NOPB的批量USD价格：.464（1000+）

LM8850URX/NOPB，工作温度：-40 to 125，封装：DSBGA (YPD)-9，包装数量MPQ：3000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LM8850URX/NOPB的批量USD价格：.387（1000+）

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