Datasheet > RT8245C

RT8245C

更新时间： 2024-02-08 05:38:24

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
24页	378K
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RT8245C 技术参数

Status：	Active	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. Method：	Resistor
Accuracy (+/- %)：	1.2	Freq (typ) (kHz)：	300
Freq (min) (kHz)：	200	Freq (max) (kHz)：	466
Iq (typ) (mA)：	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
Package Type：	WQFN3x3-20	Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS8245ABC-02.pdf

RT8245C 数据手册

RT8245A/B/C

High Efficiency, Main Power Supply Controller

for Notebook Computers

General Description

Features

^z5.5V to 25V Input Voltage Range

^z2V to 5.5V Output Voltage Range

^zNo Current Sense Resistor Needed

^z5V/3.3V Linear Regulators

The RT8245A/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 (RT8245B/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.

^z4700ppm/°C R_DS(ON)Current Sensing

^zInternal Current Limit Soft-Start and Soft Discharge

Output

^zBuilt In OVP/UVP/OCP

^zSelectable Operation Mode with Switcher Enable

Control (RT8245A)

^zSECFB Input Maintains Charge Pump Voltage

(RT8245B/C)

z Power Good Indicator (RT8245B/C includes SECFB)

z RoHS Compliant and Halogen Free

Aconstant 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.

Applications

z Notebook computers

z System Power Supplies

z 3- and 4- Cell Li+ Battery-PoweredDevice

Ordering Information

RT8245A/B/C

Package Type

QW : WQFN-20L 3x3 (W-Type)

The RT8245A/B/C is available in a WQFN-20L 3x3

package, and operates over an extended temperature range

from −40°C to 85°C.

Lead Plating System

G : Green (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.

is a registered trademark of Richtek Technology Corporation.

DS8245A/B/C-02 October 2012

www.richtek.com

12 3 4 5 6 7...24

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