PWM Controller. RT8241 Datasheet


RT8241 Controller. Datasheet pdf. Equivalent


Part Number

RT8241

Description

High Efficiency Single Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 16 Pages
Datasheet
Download RT8241 Datasheet


RT8241
®
RT8241
High Efficiency Single Synchronous Buck PWM Controller
General Description
The RT8241 PWM controller provides high efficiency,
excellent transient response, and high DC output accuracy
needed for stepping down high voltage batteries to
generate low voltage CPU core, I/O, and chipset RAM
supplies in notebook computers.
The RT8241 supports on chip voltage programming function
between 0.675V and 0.9V by controlling GX digital inputs.
The constant-on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides 100ns
instant-onresponse to load transients while maintaining
a relatively constant switching frequency.
The RT8241 achieves high efficiency at a reduced cost
by eliminating the current-sense resistor found in
traditional current-mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous
rectifier MOSFETs and enter diode emulation mode at
light load condition. The buck conversion allows this device
to directly step down high voltage batteries at the highest
possible efficiency. The RT8241 is intended for CPU core,
chipset, DRAM, or other low voltage supplies as low as
0.675V.
The RT8241 is available in a WQFN-12L 2x2 package.
Ordering Information
RT8241
Package Type
QW : WQFN-12L 2x2 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Switching Frequency Operation
A : 300kHz
B : 400kHz
C : 500kHz
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 ©2014 Richtek Technology Corporation. All rights reserved.
DS8241-03 January 2014
Features
z Meet Intel VCCSA Voltage Slew Rate
z Built-in 1% Reference Voltage
z 2-Bit Programmable Output Voltage with Integrated
Transition Support
z Quick Load-Step Response within 100ns
z 4700ppm/°C Programmable Current Limit by Low
Side RDS(ON) Sensing
z 4.5V to 26V Battery Input Range
z Internal Ramp Current Limit Soft-Start Control
z Drives Large Synchronous Rectifier FETs
z Integrated Boost Switch
z Over/Under Voltage Protection
z Thermal Shutdown
z Power Good Indicator
z RoHS Compliant and Halogen Free
Applications
z Notebook Computers
z CPU/GPU Core Supply
z Chipset/RAM Supply
z Generic DC/DC Power Regulator
Pin Configurations
(TOP VIEW)
12 11 10
LGATE 1
PHASE 2
UGATE 3
GND
13
9 PGOOD
8 G1
7 G0
4 56
WQFN-12L 2x2
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8241
RT8241
Marking Information
RT8241AGQW
30 : Product Code
30W W : Date Code
RT8241AZQW
30 : Product Code
30W W : Date Code
RT8241BGQW
41 : Product Code
41W W : Date Code
RT8241BZQW
41 : Product Code
41W W : Date Code
RT8241CGQW
40 : Product Code
40W W : Date Code
RT8241CZQW
40 : Product Code
40W W : Date Code
Typical Application Circuit
For Fixed Voltage Regulator :
VCC
R1
Chip Enable
RT8241
5 VCC
BOOT 4
CBYPASS
UGATE 3
R2 9 PGOOD
6 EN
PHASE 2
R3 C1
R4
RCS 11 CS
12,
13 (Exposed Pad) GND
LGATE 1
G0 7
G1 8
FB 10
* : Optional
For Adjustable Voltage Regulator :
VIN
CIN
Q1
LOUT
R5*
Q2
C2*
VOUT
COUT
VCC
R1
Chip Enable
RT8241
5 VCC
BOOT 4
CBYPASS
UGATE 3
R2 9 PGOOD
6 EN
PHASE 2
R3 C1
R4
RCS
11 CS
12,
13 (Exposed Pad) GND
LGATE 1
G0 7
G1 8
FB 10
* : Optional
VIN
CIN
Q1
LOUT
R5*
Q2
C2*
VOUT
RFB1 C3* COUT
RFB2
Table 1. VID Table
G0 G1 VFB
0 0 0.9V
0 1 0.8V
1 0 0.725V
1 1 0.675V
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8241-03 January 2014


Features ® RT8241 High Efficiency Single Synchr onous Buck PWM Controller General Desc ription The RT8241 PWM controller provi des high efficiency, excellent transien t response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU c ore, I/O, and chipset RAM supplies in n otebook computers. The RT8241 supports on chip voltage programming function be tween 0.675V and 0.9V by controlling GX digital inputs. The constant-on-time P WM control scheme handles wide input/ou tput voltage ratios with ease and provi des 100ns “instant-on” response to load transients while maintaining a rel atively constant switching frequency. T he RT8241 achieves high efficiency at a reduced cost by eliminating the curren t-sense resistor found in traditional c urrent-mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs and enter diode emulation mode at light lo ad condition. The buck conversion allows this device to directly ste.
Keywords RT8241, datasheet, pdf, Richtek, High, Efficiency, Single, Synchronous, Buck, PWM, Controller, T8241, 8241, 241, RT824, RT82, RT8, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)