RT9201GQV RICHTEK [Richtek Technology Corporation], RT9201GQV Datasheet

RT9201GQV

Manufacturer Part Number

RT9201GQV

Description

High Efficiency PWM Step-Down DC-DC Converter

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

1.RT9201GQV.pdf (13 pages)

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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 R

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 0.1 A

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.

DS9201-12 August 2007

DS(ON)

dramatically reduces conduction

Features

Applications

Pin Configurations

Ordering Information

Note :

Richtek Pb-free and Green products are :

RT9201

}RoHS compliant and compatible with the current require-

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

}100% matte tin (Sn) plating.

+2.5V to +5.5V Input Range

Adjustable Output From 0.85V to V

600mA Output Current

95% Efficiency

No Schottky Diode Required

85 A Quiescent Current

100% Duty Cycle in Low-Dropout Mode

800kHz Fixed-Frequency PWM Operation

Pulse-skipping Mode Operation During Light Ioad

RoHS Compliant and 100% Lead (Pb)-Free

Cellular Telephones

Wireless Modems

Personal Information Appliances

Portable Instruments

Distributed Power Systems

Battery-Powered Equipment

(1 Li-Ion or 3 NiMH/NiCd)

ments of IPC/JEDEC J-STD-020.

GND

Package Type

QV : VDFN-10L 3x3 (V-Type)

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

VDFN-10L 3x3

(TOP VIEW)

GND

VDD

PVDD

PGND

RT9201

www.richtek.com

Related parts for RT9201GQV

RT9201GQV Summary of contents

Page 1

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 ...

Page 2

RT9201 Typical Application Circuit V IN GPIO 5, Exposed Pad (11) Recommended component selection for typical application circuit OUT IN F1 (V) ( 0.85 2.5 to 4.0 24k 1.375 2.5 to 5.0 280k 1.5 2.5 ...

Page 3

Suggested Capacitors For C and C IN Component Supplier C2012X5R0J106M TDK C3225X5R0J226M ECJ2FB0J106M Panasonic ECJHVB0J226M JMK212BJ106M JMK212BJ226MG TAIYO YUDEN JMK316BJ226ML Function Block Diagram VDD Error Amplifier FB SS 300k V REF 0.8V GND Functional Pin Description Pin No. Pin Name ...

Page 4

RT9201 Absolute Maximum Ratings Input Voltage ---------------------------------------------------------------------------------------------------------- 6V l Power Dissipation VDFN 10L 3x3 ------------------------------------------------------------------------------------------------------- 2.1W Junction Temperature ----------------------------------------------------------------------------------------------- 150 C l Storage Temperature Range --------------------------------------------------------------------------------------- 150 C ...

Page 5

Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections ...

Page 6

RT9201 Typical Operating Characteristics Frequency vs. Temperature 820 810 800 790 780 770 760 750 740 730 -50 - Temperature ( C) Output Voltage vs. Temperature 1.806 1.804 1.802 1.800 1.798 1.796 1.794 1.792 1.790 -50 -25 0 ...

Page 7

Output Voltage vs. Output Current 1.90 1.88 1.86 1.84 1.82 1.80 0 100 200 300 Output Current (mA) Minimum On-Time vs. Input Voltage 300 250 200 150 100 50 0 2.5 3 3.5 4 Input Voltage (V) Current Limit vs. ...

Page 8

RT9201 Load Transient Response 100 V OUT 0 (mV) -100 500 I OUT (mA 3.3V 1.8V IN OUT I = 300 to 0mA OUT Time (500 s/Div) Ripple & Noise ...

Page 9

Soft Start ( OUT (V) 0 500 (mA 5V 3.3V IN OUT 330pF OUT SS Time (200 s/Div) Soft Start 5 ...

Page 10

RT9201 Application Information 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 2.5V to 5.5V, the RT9201 is ideally suited for portable electronic devices that are powered ...

Page 11

Sub-Harmonic at Boundary Condition (V) 0 100 V OUT 0 (mV) -100 OUT Time (10 s/Div) Figure 1 Boundary of PWM and Low-Dropout Mode Min. Input Voltage vs. Output Current 5.50 5.00 PWM ...

Page 12

RT9201 Output Capacitor Selection The capacitor's ESR determines the output ripple voltage and the initial voltage drop following a high slew-rate transient's edge. Typically, if the ESR requirement is satisfied, the capacitance is adequate to filtering. The output ripple voltage ...

Page 13

Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 DS9201-12 August 2007 D2 ...

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