Datasheet > VcoreCont> RT8857

RT8857

更新时间： 2024-01-01 19:34:09

品牌	Logo	应用领域
立锜 - RICHTEK		电压核心转换驱动控制器
页数	文件大小	规格书
26页	412K
描述
4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply

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RT8857 技术参数

Status：	Active	VID Table Support：	K8;K8_M2;VR10.x;VR11.1
Number of Phases：	4	Vcc (typ) (V)：	12
Vin (min) (V)：	10.8	Vin (max) (V)：	13.2
Accuracy (Vout>=1V) (+/- %)：	0.5	Freq (typ) (kHz)：	300
Built-in DAC Generator：	Yes	Number of MOSFET Drivers：	2
Features：	Adjustable Current Limit;Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;Current Mode Control;Cycle-by-Cycle Current Limit;DCR Current Sense;Diode Emulation Mode;Droop Control;Enable Input;Fast Transient Response;OVP;Power Good;SCP;UVP	Package Type：	WQFN7x7-48
Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS8857-03.pdf

RT8857 数据手册

RT8857/A

4/3/2/1-Phase PWM Controller with Embedded Drivers

for CPU Core Power Supply

General Description

Features

^z12V Power Supply Voltage

The RT8857/A is a 4/3/2/1-phase synchronous buck

controller with 2 integrated MOSFET drivers for Intel

VR11.1/VR10.x and AMD K8/K8_M2 CPUs power

application. RT8857/A uses differential inductor DCR

current sense to achieve phase current balance and active

voltage positioning. Other features include adjustable

operating frequency, adjustable soft start, power good

indication, external error-amp compensation, over voltage

protection, over current protection, VRHOT sensing and

IMONfor various applications. RT8857/Acomes to a small

footprint with WQFN-48L 7x7 package

^z4/3/2/1-Phase Power Conversion

^z2 Embedded MOSFET Drivers

^zInternal Regulated 5V Output

^zVID table for INTEL VR11.1/VR10.x and AMD K8/

K8_M2 CPUs

^zContinuous Differential Inductor DCR Current Sense

^zAdjustable Soft Start

^zAdjustable Frequency

^zPower Good Indication

^zAdjustable Over Current Protection

z Over Voltage Protection

z VRHOT Sensing with External Thermistor

z IMON Output Current Indication

z Power State Indicator (PSI)

Ordering Information

RT8857/A

Package Type

QW : WQFN-48L 7x7 (W-Type)

z Support MOSFET Power Stage Input Voltage (V_IN)

Down to 5V (RT8857A Only)

Lead Plating System

G : Green (Halogen Free and Pb Free)

z Small 48-Lead WQFN Package

z RoHS Compliant and Halogen Free

Support V_IN: 5/12V

Support V_IN: 12V

Note :

Pin Configurations

z V_INis the input voltage of MOSFET power stage.

z Richtek products are :

(TOP VIEW)

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

48 47 46 45 44 43 42 41 40 39 38 37

` Suitable for use in SnPb or Pb-free soldering processes.

FBRTN

QR1

QR2

SS/EN

COMP

36 PWRGD

35 BOOT1

UGATE1

PHASE1

LGATE1

Applications

z Desktop CPU Core Power

31 VCC12

30 LGATE2

29 PHASE2

GND

OFS

z Low Voltage, High CurrentDC/DC Converter

ADJ

UGATE2

BOOT2

PWM3

IMAX

IMAXPSI 11

IMONFB 12

PWM4

13 14 15 16 17 18 19 20 21 22 23 24

WQFN-48L 7x7

DS8857/A-01 April 2011

www.richtek.com

12 3 4 5 6 7...26

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