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RT8205LZQW Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part # RT8205LZQW
Description  High Efficiency, Main Power Supply Controller for Notebook Computer
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8205LZQW Datasheet(HTML) 1 Page - Richtek Technology Corporation

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RT8205L/M
1
DS8205L/M-05 June 2011
www.richtek.com
Applications
Notebook and Sub-Notebook Computers
3-Cell and 4-Cell Li+ Battery-Powered Devices
High Efficiency, Main Power Supply Controller
for Notebook Computer
General Description
The RT8205L/M is a dual step-down, switch mode power
supply controller generating logic-supply voltages in
battery powered systems. It includes two Pulse-Width
Modulation (PWM) controllers adjustable from 2V to 5.5V,
and also features fixed 5V/3.3V linear regulators. Each
linear regulator provides up to 100mA output current with
automatic linear regulator bootstrapping to the PWM
outputs. An optional external charge pump can be
monitored through SECFB (RT8205M). The RT8205L/M
includes on-board power up sequencing, a power good
output, internal soft-start, and internal soft-discharge
output that prevents negative voltage during shutdown.
The constant on-time PWM control scheme operates
without sense resistors and provides 100ns response to
load transient response while maintaining nearly constant
switching frequency. To eliminate noise in audio
applications, an ultrasonic mode is included, which
maintains the switching frequency above 25kHz. Moreover,
the diode-emulation mode maximizes efficiency for light
load applications. The RT8205L/M is available in a
WQFN-24L 4x4 package.
Features
Constant On-time Control with 100ns Load Step
Response
Wide Input Voltage Range : 6V to 25V
Dual Adjustable Outputs from 2V to 5.5V
Secondary Feedback Input Maintains Charge Pump
Voltage (RT8205M)
Fixed 3.3V and 5V LDO Output : 100mA
2V Reference Voltage
Frequency Selectable via TONSEL Setting
4700ppm/
°°°°°C RDS(ON) Current Sensing
Programmable Current Limit Combined with
Enable Control
Selectable PWM, DEM, or Ultrasonic Mode
Internal Soft-Start and Soft-Discharge
High Efficiency up to 97%
5mW Quiescent Power Dissipation
Thermal Shutdown
RoHS Compliant and Halogen Free
Ordering Information
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
RT8205
Pin Function
L : Default
M : With SECFB


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