PWM Controller. RT8241E Datasheet


RT8241E Controller. Datasheet pdf. Equivalent


Part Number

RT8241E

Description

High Efficiency Single Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 16 Pages
Datasheet
Download RT8241E Datasheet


RT8241E
®
RT8241E
High Efficiency Single Synchronous Buck PWM Controller
General Description
The RT8241E 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 RT8241E 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 RT8241E 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 RT8241E is intended for CPU core,
chipset, DRAM, or other low voltage supplies as low as
0.675V.
The RT8241E is available in a WQFN-12L 2x2 package.
Ordering Information
RT8241E
Package Type
QW : WQFN-12L 2x2 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
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 4700 ppm/°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
Marking Information
33 : Product Code
33W W : Date Code
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8241E-03 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8241E
RT8241E
Typical Application Circuit
For Fixed Voltage Regulator :
VCC
R1
Chip Enable
RT8241E
5 VCC
BOOT 4
CBYPASS
UGATE 3
R2 9 PGOOD
6 EN
PHASE 2
RCS
11 CS
12,
13 (Exposed Pad) GND
LGATE 1
G0 7
G1 8
FB 10
* : Optional
R3 C1
R4
VIN
CIN
Q1
LOUT
R5*
Q2 C2*
VOUT
COUT
For Adjustable Voltage Regulator :
VCC
R1
Chip Enable
RT8241E
5 VCC
BOOT 4
CBYPASS
UGATE 3
R2 9 PGOOD
6 EN
PHASE 2
RCS 11 CS
12,
13 (Exposed Pad) GND
LGATE 1
G0 7
G1 8
FB 10
* : Optional
R3 C1
R4
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 0.85V
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.
DS8241E-03 January 2014


Features ® RT8241E High Efficiency Single Synch ronous Buck PWM Controller General Des cription The RT8241E PWM controller pro vides high efficiency, excellent transi ent response, and high DC output accura cy needed for stepping down high voltag e batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers. The RT8241E suppor ts on chip voltage programming function between 0.675V and 0.9V by controlling GX digital inputs. The constant-on-tim e PWM control scheme handles wide input /output voltage ratios with ease and pr ovides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency . The RT8241E achieves high efficiency at a reduced cost by eliminating the cu rrent-sense resistor found in tradition al current-mode PWMs. Efficiency is fur ther enhanced by its ability to drive v ery large synchronous rectifier MOSFETs and enter diode emulation mode at ligh t load condition. The buck conversion allows this device to directly.
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