RT9901GQV RICHTEK [Richtek Technology Corporation], RT9901GQV Datasheet

RT9901GQV

Manufacturer Part Number

RT9901GQV

Description

4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

1.RT9901GQV.pdf (19 pages)

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4 Channel DC/DC Converters IC with High-Efficiency Step-Up

and Step-Down

General Description

The RT9901 is a complete power-supply solution for digital

still cameras and other hand-held devices. It integrates a

high-efficiency main step-up DC-DC converter, two high-

efficiency step-down converters, a charge pump, and

voltage detector. The RT9901 is targeted for applications

that use either two or three AA cells or a single lithiumion

battery.

The main step-up DC-DC converter accepts inputs from

1.5V to 5.5V and build in 2.6A Internal switch. The two

step-down DC-DC converters (CH2, CH3) accept inputs

from 1.5V to 5.5V and regulate a resistor-adjustable output

from 0.8V to 5.5V. Each DC-DC converters have

independent shutdown inputs.

The feature of the charge pump is to deliver few current

to micro-controller when the system operates in the

standby mode. RT9901 include a low battery detector with

0.8V detection voltage. An adjustable operating frequency

(up to 1.4MHZ) is utilized to get optimum size, cost, and

efficiency.

RT9901 is available in VQFN-32L 5x5 package.

Ordering Information

Note :

Richtek Pb-free and Green products are :

DS9901-12 August 2007

RT9901

RoHS compliant and compatible with the current require-

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

100% matte tin (Sn) plating.

ments of IPC/JEDEC J-STD-020.

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

Package Type

QV : VQFN-32L 5x5 (V-Type)

cial Standard)

Preliminary

Features

Applications

Pin Configurations

1.5V to 5.5V Battery Input Voltage Range

Main step-up DC-DC Converter

Two Step-Down DC-DC Converters

Step-up Charge Pump for Micro-Controller

Build-in 0.8V Voltage Detector

Up to 1.4MHz Switching Frequency

1μ μ μ μ μ A Supply Current in Shutdown Mode

Programmable Soft Start Function

Independent Enable Pin (CH1, CH2, CH3)

External Compensation Network (CH1, CH2, CH3)

Short Circuit Protection (CH1, CH2, CH3)

Over Voltage Protection (CH2)

32-Lead VQFN Package

RoHS Compliant and 100% Lead (Pb)-Free

Digital Still Camera

PDAs

Portable Device

94% Efficiency

100% Duty Cycle

1.5V to 5.5V Adjustable Output Voltage

Up to 90% Efficiency

2.6A, 0.3Ω Ω Ω Ω Ω Internal Power Switch

0.8V to 5.5V Adjustable Output Voltage

COMP3

PGND3

VDD3

GND

LBO

LX3

32 31 30 29

10 11 12

VQFN-32L 5x5

(TOP VIEW)

GND

28 27 26 25

RT9901

www.richtek.com

VDD2

LX2

PGND2

LX1

VDD1

Related parts for RT9901GQV

RT9901GQV Summary of contents

Page 1

Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down General Description The RT9901 is a complete power-supply solution for digital still cameras and other hand-held devices. It integrates a high-efficiency main step-up DC-DC converter, two high- efficiency step-down converters, ...

Page 2

RT9901 Typical Application Circuit 1-cell Li+ Battery 3.4V to 4.2V V BAT 10μ 1.5V/500mA R1 C3 200k 100pF C17 to C20 10μ BAT 220k C4 10μF IGBT Driver 5V/50mA C5 D2 ...

Page 3

Battery 2.0V to 3.4V V BAT 10μ 1.5V/300mA R1 200k C27 to C30 10μ 220k μC standby 3.3V/1mA R3 47k C7 10μF R4 15k C9 C8 1nF 4.7nF Figure 2. Typical ...

Page 4

RT9901 Function Block Diagram VDDC CX CPFB LBO LBI SS RT ENM www.richtek.com 4 Preliminary VDDM ENM CH1 CH4 Current-MODE Charge Pump Asynchronous Step-Up PWM Boost EN Voltage Dector CH2 Current-MODE Soft-Start Synchronous OSC Step-Down ...

Page 5

Functional Pin Description Pin No. Pin Name 1 COMP3 2 VDD3 3 LX3 4 PGND3 GND 7 8 LBO 9 VDDM 10 LBI 11 FB1 12 COMP1 13 CPFB 14 VDDC PGND1 17 ...

Page 6

RT9901 Absolute Maximum Ratings Supply Input Voltage ( DDM LX1 Pin Switch Voltage ----------------------------------------------------------------------------------------- LX2 Pin Switch Voltage ----------------------------------------------------------------------------------------- LX3 Pin Switch Voltage ----------------------------------------------------------------------------------------- CX Pin Switch Voltage ------------------------------------------------------------------------------------------ Other I/O Pin Voltage -------------------------------------------------------------------------------------------- Package Thermal Resistance VQFN-32L ...

Page 7

Parameter Oscillator Operation Frequency Range CH1 Maximum Duty Cycle CH2 Maximum Duty Cycle CH3 Maximum Duty Cycle Feedback Voltage (CH1, CH2, CH3, CH4) Feedback Voltage ( Feedback Voltage Charge Pump) Feedback Voltage Error Amplifier GM Compensation Source Current Compensation Sink ...

Page 8

RT9901 Typical Operating Characteristics Reference Voltage vs. Temperature 0.808 0.806 0.804 0.802 0.8 0.798 0.796 0.794 0.792 -50 -30 -10 10 Temperature Boost Efficiency vs. Output Current 100 V = 3.3V OUT Output ...

Page 9

Boost Load Transient Response 3.3V OUT Time (1ms/Div) Boost Load Transient Response 3.3V OUT Time (1ms/Div) Boost LX & Output Ripple V = 1.8V ...

Page 10

RT9901 Boost LX & Output Ripple V = 2.5V 3.3V OUT Time (1us/Div) Boost LX & Output Ripple 3.3V OUT Time (1us/Div) Buck2 Efficiency vs. Output Current 100 V ...

Page 11

Buck2 Output Voltage vs 3.3V, I BAT DDM OUT 1.818 1.816 1.814 1.812 1.81 1.808 1.806 1.804 2 2 Voltage (V) DD2 Buck2 Load Transient Response @I = 100mA to 400mA OUT ...

Page 12

RT9901 Buck2 LX & Output Ripple @I = 500mA OUT V = 2.5V 3.3V, V DD2 DDM Time (500ns/Div) Buck2 LX & Output Ripple @I = 250mA OUT 3.3V, V DD2 DDM Time ...

Page 13

Buck2 LX & Output Ripple @I = 250mA OUT V = 4.5V 3.3V, V DD2 DDM Time (500ns/Div) Buck3 Efficiency vs. Output Current 100 V = 1.5V OUT 4. 3.8V ...

Page 14

RT9901 Buck3 Output Voltage vs. V 1.806 V = 3.3V 250mA DD3 OUT 1.804 1.802 1.8 1.798 1.796 1.794 1.792 1.79 2 2.5 3 3.5 V Voltage (V) DDM Buck3 Load Transient Response @I = 100mA to 400mA ...

Page 15

Buck3 LX & Output Ripple @I = 500mA OUT V = 2.5V 3.3V, V DD3 DDM Time (500ns/Div) Buck3 LX & Output Ripple @I = 500mA OUT 3.3V, V DD3 DDM Time (500ns/Div) ...

Page 16

RT9901 Buck3 LX & Output Ripple @I = 500mA OUT V = 4.5V 3.3V, V DD2 DDM Time (500ns/Div) Charge Pump CX & Output Ripple @I = 1mA OUT V = 2.5V 3.3V DDM ...

Page 17

Application Information The RT9901 is a four-channel DC/DC converter with one voltage detector for digital still cameras and other hand- held device. The four channels DC/DC converters are as follows: CH1: Step-up, asynchronous current mode DC/DC converter with an internal ...

Page 18

RT9901 enters low dropout mode. Duty could be as long as 100% to extend battery life. Protection Current limit (CH2, CH3) The current of high-side PMOS is sensed cycle by cycle to prevent over current. If the current is higher ...

Page 19

Outline Dimension D A Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 DS9901-12 August 2007 Preliminary ...

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