LM8850 - 用于移动设备中高功率应用的高性能、升压 DC-DC 转换器

LM8850是TI德州仪器公司的一款转换器（集成开关）产品，LM8850是用于移动设备中高功率应用的高性能、升压 DC-DC 转换器，本站介绍了LM8850的封装应用图解、特点和优点、功能等，并给出了与LM8850相关的TI元器件型号供参考。

LM8850 - 用于移动设备中高功率应用的高性能、升压 DC-DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

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.

产品特性

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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