®
RT8016
1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC Converter
General Description
The RT8016 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 RT8016 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 shut-down 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 RT8016 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper PMOS. The RT8016 enters shutdown mode and consumes less than 0.1uA when EN pin is pulled low. The RT8016 also offers a range of 1V to 3.3V with 0.1V per step or adjustable output voltage by two external resistor.
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 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
Features
+2.5V to +5.5V Input Range Adjustable Output From 0.6V to VIN 1A Output Current
95% Efficiency
No Schottky Diode Required
1.5MHz Fixed Frequency PWM Operation Small 6-Lead WDFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Mobile Phones
Personal Information Appliances
Wireless and DSL Modems
MP3 Players
Portable Instruments
Ordering Information
RT8016-
Package Type
QW : WDFN-6L 2x2 (W-Type)
Lead Plating System P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage Default : Adjustable 10 : 1.0V
11 : 1.1V
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32 : 3.2V
33 : 3.3V
(TOP VIEW)
GND |
1 |
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6 |
FB/VOUT |
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EN 2 |
7 |
5 |
GND |
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VIN |
3 |
4 |
LX |
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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.
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. |
is a registered trademark of Richtek Technology Corporation. |
DS8016-04 February 2012 |
www.richtek.com |
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RT8016
Typical Application Circuit
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L |
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VIN |
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3 VIN |
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LX |
4 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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RT8016 |
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4.7µF |
2 |
6 |
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EN |
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VOUT |
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COUT |
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GND |
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10µF |
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1, 5 |
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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 2.2µH |
VOUT |
2.5V to 5.5V |
CIN |
RT8016 |
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C1 |
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4.7µF |
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R1 |
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2 EN |
FB |
6 |
COUT |
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10µF |
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GND |
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IR2 |
R2 |
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1, 5 |
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VOUT = VREF x 1+ R2R1
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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RT8016_FIX |
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RT8016_ADJ |
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GND |
1 |
6 VOUT |
Output capacitor |
GND |
1 |
6 |
FB |
Output |
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capacitor |
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EN |
2 |
5 GND |
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must be near |
EN |
2 |
5 |
GND |
must be near |
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RT8016 |
RT8016 |
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L1 |
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L1 |
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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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CIN |
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connected to |
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R2 |
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LX should be connected |
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Inductor by wide |
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CIN must be placed |
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to Inductor by wide and |
CIN must be placed |
and short trace, |
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between VDD and |
short trace, keep |
between VDD and |
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keep sensitive |
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GND as close as |
sensitive compontents |
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compontents away |
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GND as close as |
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possible |
away from this trace |
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from this trace |
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possible |
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Layout note:
1.The distance that CIN connects to VIN is as close as possible (Under 2mm).
2.COUT should be placed near RT8016.
Figure 3. Layout Guide for RT8016
Copyright ©2012 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
www.richtek.com |
DS8016-04 February 2012 |
2
RT8016
Functional Pin Description
Pin No. |
Pin Name |
Pin Function |
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2 |
EN |
Chip Enable (Active High). |
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3 |
VIN |
Power Input. |
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4 |
LX |
Pin for Switching. |
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1, 5 |
GND |
Ground Pin. |
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6 |
FB/VOUT |
Feedback/Output Voltage Pin. |
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7 (Exposed Pad) |
NC |
No Internal Connection. The exposed pad must be soldered to a large PCB and |
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connected to GND for maximum power 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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Detector |
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Slope |
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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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Mux |
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FB/VOUT |
Error |
Comparator |
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Current |
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Amplifier |
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Source |
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RC |
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Controller |
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COMP |
UVLO & |
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Current |
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Power Good |
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Detector |
RS2 |
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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. |
DS8016-04 February 2012 |
www.richtek.com |
3
RT8016
Absolute Maximum Ratings (Note 1)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ |
6.5V |
EN, FB Pin Voltage ------------------------------------------------------------------------------------------------------- |
−0.3V to VIN |
Power Dissipation, PD @ TA = 25°C |
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WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------- |
0.606W |
Package Thermal Resistance (Note 2) |
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WDFN-6L 2x2, θJA --------------------------------------------------------------------------------------------------------- |
165°C/W |
WDFN-6L 2x2, θJC -------------------------------------------------------------------------------------------------------- |
20°C/W |
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- |
260°C |
Storage Temperature Range -------------------------------------------------------------------------------------------- |
−65°C to 150°C |
Junction Temperature ----------------------------------------------------------------------------------------------------- |
150°C |
ESD Susceptibility (Note 3) |
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HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- |
2kV |
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ |
200V |
Recommended Operating Conditions |
(Note 4) |
Supply Input Voltage ------------------------------------------------------------------------------------------------------ |
2.5V to 5.5V |
Junction Temperature Range -------------------------------------------------------------------------------------------- |
−40°C to 125°C |
Ambient Temperature Range -------------------------------------------------------------------------------------------- |
−40°C to 85°C |
Electrical Characteristics
(VIN = 3.6V, VOUT = 2.5V, VREF = 0.6V, L = 2.2μH, CIN = 4.7μF, COUT = 10uF, TA = 25°C, IMAX = 1A unless otherwise specified)
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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Input Voltage Range |
VIN |
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2.5 |
-- |
5.5 |
V |
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Quiescent Current |
IQ |
IOUT = 0mA, VFB = VREF + 5% |
-- |
50 |
70 |
μA |
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Shutdown Current |
ISHDN |
EN = GND |
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-- |
0.1 |
1 |
μ |
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A |
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Reference Voltage |
VREF |
For Adjustable Output Voltage |
0.588 |
0.600 |
0.612 |
V |
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Adjustable Output Range |
VOUT |
(Note 6) |
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VREF |
-- |
VIN − 0.2V |
V |
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Fix |
VOUT |
VIN = (VOUT + |
V) to 5.5V or |
−3 |
-- |
3 |
% |
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Output Voltage |
VIN > 2.5V which ever is larger. |
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(Note 5) |
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Accuracy |
Adjustable |
VOUT |
VIN = VOUT + |
V to 5.5V (Note 5) |
−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 |
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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 |
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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 |
1.4 |
2 |
2.6 |
A |
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EN High-Level Input |
VEN_H |
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1.5 |
-- |
VIN |
V |
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Voltage |
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Copyright ©2012 Richtek Technology Corporation. All rights reserved. |
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is a registered trademark of Richtek Technology Corporation. |
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www.richtek.com |
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DS8016-04 February 2012 |
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RT8016
Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Unit |
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EN Low-Level Input Voltage |
VEN_L |
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-- |
-- |
0.4 |
V |
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 |
1.2 |
1.5 |
1.8 |
MHz |
Thermal Shutdown Temperature |
TSD |
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-- |
160 |
-- |
°C |
Max. Duty Cycle |
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100 |
-- |
-- |
% |
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LX Current Source |
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VIN = 3.6V, VLX = 0V or VLX = 3.6V |
1 |
-- |
100 |
μ |
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A |
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Minimum On-Time |
tON |
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-- |
120 |
140 |
ns |
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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 single-layer and four-layer test board of JEDEC 51. The measurement case position of θJC is on the lead of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. V = IOUT x PRDS(ON)
Note 6. Guarantee by design.
Note 7. The start up time is about 300μs.
Copyright ©2012 Richtek Technology Corporation. All rights reserved. |
is a registered trademark of Richtek Technology Corporation. |
DS8016-04 February 2012 |
www.richtek.com |
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