®
RT8010/A
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/LowDropout autoswitch and shutdown modes. The Internal synchronous rectifier with low RDS(ON) dramatically reduces 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 P-MOSFET. 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
(TOP VIEW) |
IC LX LX LX |
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16 15 |
14 |
13 |
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GND |
1 |
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12 |
VIN |
IC |
1 |
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6 |
FB/VOUT |
GND |
2 |
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11 |
VIN |
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GND |
3 |
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10 |
VIN |
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EN 2 |
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5 |
GND |
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17 |
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7 |
FB/VOUT |
4 |
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9 |
VIN |
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VIN |
3 |
4 |
LX |
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5 |
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8 |
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GND IC EN IC |
WDFN-6L 2x2 (RT8010) |
WQFN-16L 3x3 (RT8010A) |
Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your area.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
Features
2.5V to 5.5V Input Range
Output Voltage (Adjustable Output From 0.6V to VIN)
`RT8010 : 1V, 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 RoHS Compliant and 100% Lead (Pb)-Free
Applications
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Ordering Information
RT8010/A(-)
Package Type
QW : WDFN/WQFN (W-Type)
Lead Plating System P : Pb Free
G : Green (Halogen Free and Pb Free)
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
Note :
Richtek products are :
`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
`Suitable for use in SnPb or Pb-free soldering processes.
is a registered trademark of Richtek Technology Corporation.
DS8010/A-09 September 2012 |
www.richtek.com |
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RT8010/A
Typical Application Circuit
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L |
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VIN |
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3 |
VIN |
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4 |
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2.2µH |
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2.5V to 5.5V |
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CIN |
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LX |
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VOUT |
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RT8010/A |
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4.7µF |
2 |
6 |
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COUT |
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EN |
VOUT |
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1 IC |
GND |
5 |
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10µF |
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Figure 1. Fixed Voltage Regulator
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L |
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VIN |
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3 |
VIN |
LX |
4 |
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2.2µH |
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VOUT |
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2.5V to 5.5V |
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CIN |
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C1 |
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RT8010/A |
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4.7µF |
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2 |
6 |
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R1 |
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COUT |
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EN |
FB |
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1 IC |
GND |
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5 |
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10µF |
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IR2 |
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R1 |
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R2 |
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VOUT = VREF x 1 |
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R2 |
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with R2 = 300kΩ to 60kΩ so the IR2 = 2μA to 10μA,
and (R1 x C1) should be in the range between 3x10-6 and 6x10-6 for component selection.
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Figure 2. Adjustable Voltage Regulator |
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Layout Guide |
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RT8010/A_FIX |
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RT8010/A_ADJ |
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IC |
1 |
6 VOUT |
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IC |
1 |
6 |
FB |
Output |
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Output capacitor |
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capacitor |
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must be near |
EN |
2 |
5 |
GND |
must be near |
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EN |
2 |
5 GND |
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RT8010 |
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L1 |
RT8010/A |
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L1 |
VIN |
3 |
4 |
LX |
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VIN |
3 |
4 LX |
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R1 |
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COUT |
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COUT |
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LX should be |
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CIN |
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R2 |
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CIN |
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LX should be connected |
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connected to |
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Inductor by wide |
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CIN must be placed |
to Inductor by wide and |
CIN must be placed |
and short trace, |
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to the VIN as close |
short trace, keep |
to the VIN as close |
keep sensitive |
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as possible. |
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sensitive components |
as possible. |
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components away |
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away from this trace. |
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from this trace. |
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Figure 3
Layout note :
1.The distance that CIN connects to VIN is as close as possible (Under 2mm).
2.COUT should be placed near RT8010/A.
Copyright ©2012 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8010/A-09 September 2012 |
2
RT8010/A
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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RT8010 |
RT8010A |
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1 |
6, 8, 16 |
IC |
Internal Connection. Leave floating and do not make connection |
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to this pin. |
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2 |
7 |
EN |
Chip Enable (Active High). |
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3 |
9, 10, 11, 12 |
VIN |
Power Input. (Pin 9 and Pin 10 must be connected with Pin 11). |
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4 |
13, 14, 15 |
LX |
Pin for Switching. (Pin 13 must be connected with Pin 14). |
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5 |
1, 2, 3, 5 |
GND |
Ground. |
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6 |
4 |
FB/VOUT |
Feedback/Output Voltage. |
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7 (Exposed Pad) |
17 (Exposed Pad) |
GND |
Ground. The exposed pad must be soldered to a large PCB and |
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connected to GND for maximum thermal dissipation. |
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Function Block Diagram
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EN |
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VIN |
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OSC & |
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RS1 |
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Current |
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Shutdown |
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Limit |
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Control |
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Slope |
Detector |
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Compensation |
Current |
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Sense |
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Control |
Driver |
LX |
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PWM |
Logic |
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FB/VOUT |
Error |
Comparator |
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Amplifier |
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RC |
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COMP |
UVLO & |
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RS2 |
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Power Good |
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Detector |
VREF |
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GND |
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Copyright ©2012 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8010/A-09 September 2012 |
www.richtek.com |
3
RT8010/A
Absolute Maximum Ratings |
(Note 1) |
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Supply Input Voltage ------------------------------------------------------------------------------------------------- |
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6.5V |
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EN, FB Pin Voltage -------------------------------------------------------------------------------------------------- |
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−0.3V to VIN |
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LX Pin Switch Voltage ----------------------------------------------------------------------------------------------- |
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−0.3V to (VIN + 0.3V) |
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<20ns ------------------------------------------------------------------------------------------------------------------- |
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−4.5V to 7.5V |
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LX Pin Switch Current ----------------------------------------------------------------------------------------------- |
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2A |
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Power Dissipation, PD @ TA = 25°C |
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WDFN-6L 2x2 --------------------------------------------------------------------------------------------------------- |
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0.833W |
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WQFN-16L 3x3 |
------------------------------------------------------------------------------------------------------- |
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1.47W |
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Package Thermal Resistance |
(Note 2) |
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WDFN-6L 2x2, θJA ---------------------------------------------------------------------------------------------------- |
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120°C/W |
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WDFN-6L 2x2, θJC --------------------------------------------------------------------------------------------------- |
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20°C/W |
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WQFN-16L 3x3, θJA -------------------------------------------------------------------------------------------------- |
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68°C/W |
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WQFN-16L 3x3, θJC ------------------------------------------------------------------------------------------------- |
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7.5°C/W |
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Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- |
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260°C |
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Storage Temperature Range --------------------------------------------------------------------------------------- |
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−65°C to 150°C |
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Junction Temperature ------------------------------------------------------------------------------------------------ |
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150°C |
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ESD Susceptibility (Note 3) |
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HBM (Human Body Model) ----------------------------------------------------------------------------------------- |
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2kV |
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Recommended Operating Conditions |
(Note 4) |
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Supply Input Voltage ------------------------------------------------------------------------------------------------- |
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2.5V to 5.5V |
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Junction Temperature Range --------------------------------------------------------------------------------------- |
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−40°C to 125°C |
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Ambient Temperature Range --------------------------------------------------------------------------------------- |
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−40°C to 85°C |
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Electrical Characteristics |
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(VIN = 3.6V, VOUT = 2.5V, L = 2.2μH, CIN = 4.7μF, COUT = 10μF, TA = 25°C, IMAX = 1A unless otherwise specified) |
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Parameter |
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Symbol |
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Test Conditions |
Min |
Typ |
Max |
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Unit |
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Input Voltage Range |
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VIN |
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2.5 |
-- |
5.5 |
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V |
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Quiescent Current |
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IQ |
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IOUT = 0mA, VFB = VREF + 5% |
-- |
50 |
70 |
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μA |
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Shutdown Current |
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ISHDN |
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EN = GND |
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0.1 |
1 |
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μA |
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Reference Voltage |
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VREF |
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For Adjustable Output Voltage |
0.588 |
0.6 |
0.612 |
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V |
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Adjustable Output Range |
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VOUT |
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(Note 5) |
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VREF |
-- |
VIN − 0.2V |
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V |
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VOUT |
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VIN = 2.5V to 5.5V, VOUT = 1V |
−3 |
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3 |
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0A < IOUT < 1A |
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VOUT |
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VIN = 2.5V to 5.5V, VOUT = 1.2V |
−3 |
-- |
3 |
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0A < IOUT < 1A |
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Output Voltage |
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Fix |
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VOUT |
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VIN = 2.5V to 5.5V, VOUT = 1.5V |
−3 |
-- |
3 |
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% |
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Accuracy |
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0A < IOUT < 1A |
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VOUT |
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VIN = 2.5V to 5.5V, VOUT = 1.6V |
−3 |
-- |
3 |
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0A < IOUT < 1A |
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VOUT |
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VIN = 2.5V to 5.5V, VOUT = 1.8V |
−3 |
-- |
3 |
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0A < IOUT < 1A |
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Copyright ©2012 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
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DS8010/A-09 September |
2012 |
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4 |
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RT8010/A
Parameter |
Symbol |
Test Conditions |
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Min |
Typ |
Max |
Unit |
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VOUT |
VIN = VOUT + V to 5.5V |
(Note 6) |
−3 |
-- |
3 |
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VOUT = 2.5V, 0A < IOUT < 1A |
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Fix |
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Output Voltage |
VOUT |
VIN = VOUT + V to 5.5V |
(Note 6) |
−3 |
-- |
3 |
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Accuracy |
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VOUT = 3.3V, 0A < IOUT < 1A |
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Adjustable |
VOUT |
VIN = VOUT + V to 5.5V |
(Note 6) |
−3 |
-- |
3 |
% |
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0A < IOUT < 1A |
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FB Input Current |
IFB |
VFB = VIN |
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−50 |
-- |
50 |
nA |
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P-MOSFET RON |
RDS(ON)_P |
IOUT = 200mA |
VIN = 3.6V |
-- |
0.28 |
-- |
Ω |
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VIN = 2.5V |
-- |
0.38 |
-- |
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N-MOSFET RON |
RDS(ON)_N |
IOUT = 200mA |
VIN = 3.6V |
-- |
0.25 |
-- |
Ω |
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VIN = 2.5V |
-- |
0.35 |
-- |
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P-Channel Current Limit |
ILIM_P |
VIN = 2.5V to 5.5 V |
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1.4 |
1.5 |
-- |
A |
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EN High-Level Input Voltage |
VEN_H |
VIN = 2.5V to 5.5V |
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1.5 |
-- |
-- |
V |
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EN Low-Level Input Voltage |
VEN_L |
VIN = 2.5V to 5.5V |
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-- |
-- |
0.4 |
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Under Voltage Lock Out threshold |
UVLO |
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-- |
1.8 |
-- |
V |
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Hysteresis |
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-- |
0.1 |
-- |
V |
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Oscillator Frequency |
fOSC |
VIN = 3.6V, IOUT = 100mA |
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1.2 |
1.5 |
1.8 |
MHz |
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Thermal Shutdown Temperature |
TSD |
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-- |
160 |
-- |
°C |
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Max. Duty Cycle |
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100 |
-- |
-- |
% |
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LX Leakage Current |
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VIN = 3.6V, VLX = 0V or VLX = 3.6V |
− |
1 |
-- |
1 |
μ |
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A |
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution recommended.
Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Guarantee by design.
Note 6. V = IOUT x PRDS(ON)
Copyright ©2012 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8010/A-09 September 2012 |
www.richtek.com |
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5 |