RT8010A Richtek Technology Corporation, RT8010A Datasheet

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RT8010A

Manufacturer Part Number
RT8010A
Description
Manufacturer
Richtek Technology Corporation
Datasheet

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1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC Converter
General Description
The RT8010/A is a high-efficiency Pulse-Width-Modulated
(PWM) step-down DC-DC converter. Capable of delivering
1A output current over a wide input voltage range from
2.5V to 5.5V, the RT8010/A is ideally suited for portable
electronic devices that are powered from 1-cell Li-ion
battery or from other power sources such as cellular
phones, PDAs and hand-held devices.
Two operating modes are available including : PWM/Low-
Dropout autoswitch and shut-down modes. The Internal
synchronous rectifier with low R
conduction loss at PWM mode. No external Schottky
diode is required in practical application.
The RT8010/A enters Low-Dropout mode when normal
PWM cannot provide regulated output voltage by
continuously turning on the upper PMOS. RT8010/A enter
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 operating
frequency of 1.5MHz. This along with small WDFN-6L 2x2
and WQFN-16L 3x3 package provides small PCB area
application. Other features include soft start, lower internal
reference voltage with 2% accuracy, over temperature
protection, and over current protection.
Pin Configurations
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.
DS8010/A-02 March 2007
WDFN-6L 2x2 (RT8010)
VIN
NC
EN
1
2
3
6
5
4
FB/VOUT
GND
LX
(TOP VIEW)
FB/VOUT
DS(ON)
WQFN-16L 3x3 (RT8010A)
GND
GND
GND
dramatically reduces
1
2
3
4
16
5
15
6
14
7
13
8
10
12
11
9
VIN
VIN
VIN
VIN
Features
Applications
Ordering Information
Note :
RichTek Pb-free and Green products are :
RT8010/A(-
+2.5V to +5.5V Input Range
Output Voltage (Adjustable Output From 0.6V to V
1A Output Current
95% Efficiency
No Schottky Diode Required
1.5MHz Fixed-Frequency PWM Operation
Small 6-Lead WDFN and 16-Lead WQFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
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.
RT8010 : 1.0V, 1.2V, 1.5V, 1.6V, 1.8V, 2.5V and 3.3V
RT8010A Adjustable Output Voltage Only
Fixed/Adjustable Output Voltage
)
Package Type
QW : WDFN/WQFN (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
Output Voltage
Default : Adjustable (RT8010/A)
Fixed (RT8010)
10 : 1.0V
12 : 1.2V
15 : 1.5V
16 : 1.6V
18 : 1.8V
25 : 2.5V
33 : 3.3V
WQFN-16L 3x3
WDFN-6L 2x2
cial Standard)
RT8010/A
www.richtek.com
IN
1
)

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RT8010A Summary of contents

Page 1

... DS8010/A-02 March 2007 Features +2.5V to +5.5V Input Range Output Voltage (Adjustable Output From 0. RT8010 : 1.0V, 1.2V, 1.5V, 1.6V, 1.8V, 2.5V and 3.3V Fixed/Adjustable Output Voltage RT8010A Adjustable Output Voltage Only 1A Output Current 95% Efficiency No Schottky Diode Required 1.5MHz Fixed-Frequency PWM Operation Small 6-Lead WDFN and 16-Lead WQFN Package dramatically reduces ...

Page 2

RT8010/A Typical Application Circuit 2.5V to 5.5V 2.5V to 5.5V ⎛ ⎞ R1 ⎜ ⎟ OUT REF ⎝ ⎠ R2 with R2 = 300kΩ to 60kΩ so the I R2 and (R1 x C1) ...

Page 3

... Functional Pin Description Pin Number RT8010 RT8010A 16, Exposed Pad Exposed Pad 10, 11, 12 VIN 4 13, 14 Function Block Diagram Slope Compensation FB/VOUT Error Amplifier COMP DS8010/A-02 March 2007 Pin Name NC No Internal Connect (Floating or Connecting to GND). ...

Page 4

RT8010/A Absolute Maximum Ratings Supply Input Voltage ------------------------------------------------------------------------------------------------------ 6.5V EN, FB Pin Voltage ------------------------------------------------------------------------------------------------------- −0. Power Dissipation 25° WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------- 0.606W WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------------ 1.47W Package Thermal Resistance (Note 4) WDFN-6L ...

Page 5

Parameter Output Voltage Fix Accuracy Output Voltage Adjustable Accuracy FB Input Current PMOSFET R ON NMOSFET R ON P-Channel Current Limit EN High-Level Input Voltage EN Low-Level Input Voltage Under Voltage Lock Out threshold UVLO Hysteresis Oscillator Frequency Thermal Shutdown ...

Page 6

RT8010/A Typical Operating Characteristics Efficiency vs. Output Current 100 3.3V, OUT 0 0 0.1 0.2 0.3 0.4 ...

Page 7

Output Voltage vs. Load Current 1.230 1.225 1.220 1.215 V = 5.0V IN 1.210 1.205 V = 3.6V IN 1.200 1.195 1.190 1.185 1.180 0 0.1 0.2 0.3 0.4 Load Current (A) Frequency vs. Input Voltage 1.60 1.55 1.50 1.45 ...

Page 8

RT8010/A Power On from 3.6V 1.2V OUT V EN (2V/Div) V OUT (1V/Div (500mA/Div) Time (100μs/Div) Power On from VIN 1.2V OUT V IN ...

Page 9

Load Transient Response 1.2V IN OUT I = 50mA to 1A OUT ac V OUT (50mV/Div) I OUT (500mA/Div) Time (50μs/Div) Output Ripple Voltage V = 3.6V 1.2V IN OUT ...

Page 10

RT8010/A Applications Information The basic RT8010/A application circuit is shown in Typical Application Circuit. External component selection is determined by the maximum load current and begins with the selection of the inductor value and operating frequency followed by C and ...

Page 11

The output ripple is highest at maximum input voltage since ΔI increases with input voltage. Multiple capacitors L placed in parallel may be needed to meet the ESR and RMS current handling requirements. Dry tantalum, special polymer, aluminum electrolytic and ...

Page 12

RT8010 losses are calculated from the resistances of the internal switches, R and external inductor R SW continuous mode, the average output current flowing through inductor L is “chopped” between the main switch and the synchronous ...

Page 13

Connect all analog grounds to a command node and then connect the command node to the power ground behind the output capacitors. An example of 2-layer PCB layout is shown in Figure 7 to Figure 8 for reference ...

Page 14

RT8010/A Outline Dimension Symbol www.richtek.com SEE DETAIL Note : The configuration of the Pin #1 identifier is ...

Page 15

... W-Type 16L QFN 3x3 Package Richtek Technology Corporation Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com RT8010 DETAIL A Pin #1 ID and Tie Bar Mark Options ...

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