RT9907GQV RICHTEK [Richtek Technology Corporation], RT9907GQV Datasheet

RT9907GQV

Manufacturer Part Number

RT9907GQV

Description

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

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

1.RT9907GQV.pdf (19 pages)

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

and Step-Down

General Description

The RT9907 is a three channel power-supply solution for

digital still cameras and other battery-powered devices. It

integrates an asynchronous step-up and two synchronous

step-down DC-DC converters. The RT9907 is targeted for

applications that use two AA cells or a single lithium-ion

battery.

The three DC-DC converters (CH1, CH2, CH3) accept input

voltage from 1.5V to 5.5V. Each DC-DC converter has

better transient response and excellent stability by

providing current-mode control and external compensation

network. With built-in Internal MOSFET and up to 1.4MHz

operating frequency, the RT9907 allows minimum BOM

cost and PCB area.

The step-down DC-DC converters (CH2, CH3) can regulate

output voltage as low as 0.8V. Three operational modes

are available: PWM, PSM, Low-Dropout modes. At PWM

mode, Internal synchronous rectifier with low R

dramatically reduces conduction loss and achieve 94%

efficiency. It enters Low-Dropout mode when normal PWM

cannot provide regulated output voltage by continuously

turning on the upper P-MOSFET. No external Schottky

diode is required in practical application.

Each DC-DC converter has independent enable input and

soft-start function allowing versatile power sequence

combination. Complete protection functions are

implemented such as short circuit, over-voltage protection.

The RT9907 is available in small VQFN-24L 4x4 package.

Ordering Information

Note :

Richtek Pb-free and Green products are :

DS9907-07 August 2007

RT9907

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.

Package Type

QV : VQFN-24L 4x4 (V-Type)

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

Preliminary

DS(ON)

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

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)

24-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

LX3

VQFN-24L 4x4

(TOP VIEW)

GND

RT9907

www.richtek.com

EN1

ENM

VDD2

LX2

PGND2

LX1

Related parts for RT9907GQV

RT9907GQV Summary of contents

Page 1

Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down General Description The RT9907 is a three channel power-supply solution for digital still cameras and other battery-powered devices. It integrates an asynchronous step-up and two synchronous step-down DC-DC converters. The ...

Page 2

RT9907 Typical Application Circuit 1-cell Li+ Battery 3.4V to 4.2V V BAT 10μ 1.5V/500mA 200k 10μ 220k Chip Enable 4.7nF Figure 1. Typical Application Circuit for 1-cell Li+ Battery www.richtek.com 2 Preliminary V BAT 10μF 1μF ...

Page 3

Battery 1.8V to 3.2V V BAT 10μ 1.5V/300mA 200k 10μ 220k Chip Enable 4.7nF Figure 2. Typical Application Circuit for 2-AA Battery Supply DS9907-07 August 2007 Preliminary 1μ VDD3 4.7μH 3 LX3 100pF ...

Page 4

RT9907 Function Block Diagram SS RT ENM www.richtek.com 4 Preliminary VDDM ENM Current-MODE Asynchronous Step-Up Current-MODE Soft-Start Synchronous OSC Step-Down Buck2 PWM OSC Thermal Shutdown Current-MODE Synchronous Step-Down Buck3 GND EN1 EN2 EN3 CH1 Off 1 ...

Page 5

Functional Pin Description Pin No. Pin Name 1 COMP3 CH3 Feedback Compensation Pin. 2 VDD3 CH3 Power Input Pin. CH3 Switch Node. Drains of the internal P-MOSFET and N-MOSFET switches. 3 LX3 Connect an inductor to LX3 pins together as ...

Page 6

RT9907 Absolute Maximum Ratings Supply Input Voltage DDM LX1 Pin Switch Voltage ------------------------------------------------------------------------------------------ LX2 Pin Switch Voltage ------------------------------------------------------------------------------------------ LX3 Pin Switch Voltage ------------------------------------------------------------------------------------------ Other I/O Pin Voltage --------------------------------------------------------------------------------------------- Power Dissipation 25° ...

Page 7

Parameter Oscillator Operation Frequency Range CH1 Maximum Duty Cycle CH2 Maximum Duty Cycle CH3 Maximum Duty Cycle Feedback Voltage (CH1, CH2, CH3) Feedback Voltage Feedback Voltage Error Amplifier GM Compensation Source Current Compensation Sink Current Power Switch CH1 On Resistance ...

Page 8

RT9907 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

RT9907 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

RT9907 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

RT9907 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

RT9907 Buck3 LX & Output Ripple @I = 500mA OUT V = 4.5V 3.3V, V DD2 DDM Time (500ns/Div) www.richtek.com 16 Preliminary = 1.8V OUT DS9907-07 August 2007 ...

Page 17

Application Information The RT9907 is a three-channel DC/DC converter with one voltage detector for digital still cameras and other hand- held device. The three channels DC/DC converters are as follows: CH1: Step-up, asynchronous current mode DC/DC converter with an internal ...

Page 18

RT9907 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 than 1.5A (typical), then the high-side PMOS is off and the low-side NMOS is on. ...

Page 19

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 DS9907-07 August 2007 Preliminary D2 SEE ...

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