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RT8239C

产品描述High Efficiency, Main Power Supply Controller for Notebook Computers, Active, 19V, 5.5V, 25V, 2V, 5.5V, Resistor
产品类别电源/电源管理    BuckCont   
文件大小380KB,共24页
制造商Richtek Technology Corporation
官网地址https://www.richtek.com/
下载文档 详细参数 选型对比 全文预览

RT8239C概述

High Efficiency, Main Power Supply Controller for Notebook Computers, Active, 19V, 5.5V, 25V, 2V, 5.5V, Resistor

RT8239C规格参数

参数名称属性值
StatusActive
Vs (typ)(V)19
Vin (min)(V)5.5
Vin (max)(V)25
Vout (min)(V)2
Vout (max)(V)5.5
Preset Vout(V)
Output Adj. MethodResis
Accuracy(+/- %)1.2
Freq (typ)(kHz)300
Freq (min)(kHz)200
Freq (max)(kHz)466
Iq (typ)(mA)1
FeaturesAdjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;PSM;Power Good;SCP;UVP;Ultrasonic Mode Control
Package TypeWQFN3x3-20

文档预览

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®
RT8239A/B/C
High Efficiency, Main Power Supply Controller
for Notebook Computers
General Description
The RT8239A/B/C is a dual step down, Switch Mode Power
Supply (SMPS) controller which generates logic supply
voltages for battery powered systems. It includes two
Pulse Width Modulation (PWM) controllers adjustable
from 2V to 5.5V and also two fixed 5V/3.3V linear
regulators. One of the controllers (LDO5) provides
automatic switch over to the BYP1 input connected to
the main SMPS1 output for maximized efficiency. An
optional external charge pump can be monitored through
SECFB (RT8239B/C). Other features include on board
power up sequencing, a power good output, internal soft-
start, and a soft discharge output that prevents negative
voltage during shutdown.
A constant on-time PWM control scheme operates without
sense resistors and assures fast 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, a diode emulation mode
maximizes efficiency for light load applications. The
SMPS1/SMPS2 switching frequency can be adjustable
from 200kHz/233kHz to 400kHz/466kHz respectively.
The RT8239A/B/C is available in a WQFN-20L 3x3
package, and operates over an extended temperature range
from
−40°C
to 85°C.
Features
5.5V to 25V Input Voltage Range
2V to 5.5V Output Voltage Range
No Current Sense Resistor Needed
5V/3.3V Linear Regulators
4700ppm/°C R
DS(ON)
Current Sensing
°
Internal Current Limit Soft-Start and Soft Discharge
Output
Built In OVP/UVP/OCP
Selectable Operation Mode with Switcher Enable
Control (RT8239A)
SECFB Input Maintains Charge Pump Voltage
(RT8239B/C)
Power Good Indicator (RT8239B/C includes SECFB)
RoHS Compliant and Halogen Free
Applications
Notebook computers
System Power Supplies
3- and 4- Cell Li+ Battery-Powered Device
Ordering Information
RT8239A/B/C
Package Type
QW : WQFN-20L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Pin Function With
A : ENM
B : SECFB
C : SECFB, Ultrasonic Mode
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.
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8239A/B/C-06 October 2012
www.richtek.com
1

RT8239C相似产品对比

RT8239C RT8239AZQW RT8239CGQW RT8239A RT8239B
描述 High Efficiency, Main Power Supply Controller for Notebook Computers, Active, 19V, 5.5V, 25V, 2V, 5.5V, Resistor IC CTRLR SMPS DUAL 20WQFN IC CTRLR SMPS DUAL 20WQFN High Efficiency, Main Power Supply Controller for Notebook Computers, Active, 19V, 5.5V, 25V, 2V, 5.5V, Resistor High Efficiency, Main Power Supply Controller for Notebook Computers, Active, 19V, 5.5V, 25V, 2V, 5.5V, Resistor
Status Active - - Active Active
Vs (typ)(V) 19 - - 19 19
Vin (min)(V) 5.5 - - 5.5 5.5
Vin (max)(V) 25 - - 25 25
Vout (min)(V) 2 - - 2 2
Vout (max)(V) 5.5 - - 5.5 5.5
Output Adj. Method Resis - - Resis Resis
Accuracy(+/- %) 1.2 - - 1.2 1.2
Freq (typ)(kHz) 300 - - 300 300
Freq (min)(kHz) 200 - - 200 200
Freq (max)(kHz) 466 - - 466 466
Iq (typ)(mA) 1 - - 1 1
Features Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;PSM;Power Good;SCP;UVP;Ultrasonic Mode Control - - Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;PSM;Power Good;SCP;UVP;Ultrasonic Mode Control Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;PSM;Power Good;SCP;UVP;Ultrasonic Mode Control
Package Type WQFN3x3-20 - - WQFN3x3-20 WQFN3x3-20
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