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The RT6550A is a step-down, controller generating supply voltages for battery-powered systems. It includes Pulse-Width Modulation (PWM) controller adjustable from 2V to 5.5V, and a 5V linear regulator which provides up to 100mA output current. Other features include on-board power-up sequencing, internal soft-start, and soft-discharge output that prevents negative voltage during shutdown.

A constant current ripple PWM control scheme operates without sense resistors and provides 100ns response to load transient. The RT6550A is available in the WDFN-10L 3x3 package.

Applications

  • Notebook and Sub-Notebook Computers
  • System Power Supplies
  • 3-Cell and 4-Cell Li+ Battery-Powered Devices
Key Spec.
RT6550A
Status EOL
Vs (typ) (V) 12
Vin (min) (V) 5
Vin (max) (V) 25
Vout (min) (V) 2
Vout (max) (V) 5.5
Output Adj. Method Resistor
Freq (typ) (kHz) 300
Freq (min) (kHz) 240
Freq (max) (kHz) 360
Iq (typ) (mA) 0.42
Ext Sync Yes
Features ACOT Control;Adjustable Current Limit;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Enable Input;OCP;OVP;UVP
Package Type WDFN3x3-10
Features
  • Support Connected Shutdown Mode for Ultrabook
  • CCRCOT Control with 100ns Load Step Response
  • PWM Maximum Duty Ratio > 98%
  • 5V to 25V Input Voltage Range
  • 2V to 5.5V Output Voltage Range
  • 5V LDO with 100mA Output Current
  • Internal Frequency Setting with 300kHz @ VIN =12V
  • Internal Soft-Start and Soft-Discharge
  • 4700ppm/°C RDS(ON) Current Sensing
  • Independent Switcher Enable Control
  • Built-In OVP/UVP/OCP/OTP
  • Non-Latch UVLO
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