900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




  Richtek Technology Electronic Components Datasheet  

RT9201 Datasheet

High Efficiency PWM Step-Down DC-DC Converter

No Preview Available !

RT9201
High Efficiency PWM Step-Down DC-DC Converter
General Description
The RT9201 is a high-efficiency pulse-width-modulated
(PWM) step-down DC-DC converter. Capable of delivering
600mA output current over a wide input voltage range
from 2.5 to 5.5V, the RT9201 is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or from other power sources within the range such
as cellular phones, PDAs and handy-terminals.
Four operational modes are available: PWM, PSM, Low-
Dropout and shut-down modes. Internal synchronous
rectifier with low RDS(ON) dramatically reduces conduction
loss at PWM mode. No external Schottky diode is
required in practical application. The RT9201 auto-
matically turns off the synchronous rectifier while the
inductor current is low and enters discontinuous PWM
mode. This can increase efficiency at light load condition.
The RT9201 enters PSM (pulse-skipping mode) at
extremely light load condition. The equivalent switching
frequency is reduced to increase the efficiency in PSM.
The RT9201 enters Low-Dropout mode when normal
PWM cannot provide regulated output voltage by
continuously turning on the upper P-MOSFET. RT9201
enters shut-down mode and consumes less than 0.1µA
when EN pin is pulled low.
The switching ripple is easily smoothed-out by small
package filtering elements due to a fixed operation
frequency of 800kHz. This along with small VDFN package
provides small PCB area application. Other features
include soft start, 0.8V internal reference voltage with
1% accuracy, over temperature protection, and over
current protection.
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
DS9201-11 March 2007
Features
l +2.5V to +5.5V Input Range
l Adjustable Output From 0.85V to VIN
l 600mA Output Current
l 95% Efficiency
l No Schottky Diode Required
l 85µA Quiescent Current
l 100% Duty Cycle in Low-Dropout Mode
l 800kHz Fixed-Frequency PWM Operation
l Pulse-skipping Mode Operation During Light Ioad
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
l Cellular Telephones
l Wireless Modems
l Personal Information Appliances
l Portable Instruments
l Distributed Power Systems
l Battery-Powered Equipment
(1 Li-Ion or 3 NiMH/NiCd)
Pin Configurations
(TOP VIEW)
EN 1
SS 2
FB 3
NC 4
GND 5
GND
10 NC
9 VDD
8 PVDD
7 LX
PGND
VDFN-10L 3x3
Ordering Information
RT9201
Package Type
QV : VDFN-10L 3x3 (V-Type)
Note :
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
RichTek Pb-free and Green 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.
}100% matte tin (Sn) plating.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9201 Datasheet

High Efficiency PWM Step-Down DC-DC Converter

No Preview Available !

RT9201
Typical Application Circuit
VIN
CIN
GPIO
8 PVDD
LX 7
9 VDD
FB 3
RT9201
1 EN
SS 2
5 GND
PGND 6
LX
CF1
CSS
CF2
VOUT
RF1 COUT
RF2
V OUT = 0.8 × R F1 + R F2
R F2
Recommended using lower ESR capacitor
Recommended component selection for typical application circuit.
VOUT
(V)
0.85
VIN
(V)
2.5 to 4.0
RF1
()
24k
CF1
(pF)
330
RF2
()
390k
CF2
(pF)
10
1.375 2.5 to 5.0 280k 33 390k 10
1.5 2.5 to 5.5 343k 22 390k 10
1.8 2.5 to 5.5 487k 15 390k 10
2.5 3.5 to 5.5 820k 10 390k 10
3.3 4.5 to 5.5 1.2M 5.6 390k 10
LX
(µH)
4.7
4.7
6.8
6.8
10
10
CSS
(pF)
330
330
470
470
680
1000
CIN
(uF)
10
COUT
(uF)
22 or (10 x 2)
10 22 or (10 x 2)
10 22 or (10 x 2)
10 22 or (10 x 2)
10 22 or (10 x 2)
10 22 or (10 x 2)
Suggested Inductors
Component
Supplier
Series
ABC
SH4018
SR0302
TDK
SLF6028
Coilcraft
DO1606
Inductance (µH) ESR (m)
4.7 82
6.8 100
10 150
4.7 150
6.8 180
10 250
4.7 28
6.8 35
10 53
4.7 150
6.8 200
10 300
Current Rating (mA)
1500
1150
1000
1200
1000
800
1600
1500
1300
1100
1000
900
Dimensions (mm)
4.8x4.8x1.8
3x2.8x2.5
6x6x2.8
6.5x5.23x2
www.richtek.com
2
DS9201-11 March 2007


Part Number RT9201
Description High Efficiency PWM Step-Down DC-DC Converter
Maker Richtek Technology
PDF Download

RT9201 Datasheet PDF






Similar Datasheet

1 RT9201 High Efficiency PWM Step-Down DC-DC Converter
Richtek Technology
2 RT9202 Single Synchronous Buck PWM DC-DC Controller
Richtek
3 RT9202B Single Synchronous Buck PWM DC-DC Controller
Richtek
4 RT9203 Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
Richtek
5 RT9203A Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
Richtek
6 RT9204 Dual Regulators - Standard Buck PWM DC-DC and Linear Controller
Richtek
7 RT9204A Dual Regulators - Standard Buck PWM DC-DC and Linear Controller
Richtek
8 RT9205 Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
Richiek
9 RT9205A Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller
Richiek





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy