®
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/Low-
Dropout autoswitch and shutdown modes. The Internal
synchronous rectifier with low R
DS(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.
Features
2.5V to 5.5V Input Range
Output Voltage (Adjustable Output From 0.6V to V
IN
)
½
RT8010 : 1V, 1.2V, 1.5V, 1.6V, 1.8V, 2.5V and 3.3V
Fixed/Adjustable Output Voltage
½
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
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Configurations
(TOP VIEW)
IC
LX
LX
LX
16 15 14 13
IC
EN
VIN
1
2
3
7
6
5
4
FB/VOUT
GND
LX
GND
GND
GND
FB/VOUT
1
2
3
4
5
6
7
8
17
12
11
VIN
VIN
10
VIN
9
VIN
WDFN-6L 2x2 (RT8010)
WQFN-16L 3x3 (RT8010A)
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
GND
IC
EN
IC
is a registered trademark of Richtek Technology Corporation.
DS8010/A-10 February 2015
www.richtek.com
1
®
RT8010/A
Ordering Information
RT8010/A(-
)
Pin 1 Orientation
***
(3) : Quadrant 3, Follow EIA-481-D
(For RT8010AGQW Only)
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 :
***Empty means Pin1 orientation is Quadrant 1
Richtek products are :
½
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
½
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8010/A-10 February 2015
www.richtek.com
2
RT8010/A
Typical Application Circuit
V
IN
2.5V to 5.5V
3
C
IN
4.7µF
4
L
2.2µH
V
OUT
C
OUT
10µF
VIN
LX
RT8010/A
2
1
EN
IC
VOUT
GND
6
5
Figure 1. Fixed Voltage Regulator
V
IN
2.5V to 5.5V
3
C
IN
4.7µF
2
1
VIN
LX
4
L
2.2µH
V
OUT
C1
R1
RT8010/A
EN
IC
FB
GND
6
5
I
R2
C
OUT
10µF
R2
V
OUT
½
V
REF
x
1
R1
R2
with R2 = 300kΩ to 60kΩ so the I
R2
= 2μA to 10μA,
and (R1 x C1) should be in the range between 3x10
-6
and 6x10
-6
for component selection.
Figure 2. Adjustable Voltage Regulator
Layout Guide
RT8010/A_FIX
RT8010/A_ADJ
IC
1
2
3
6 FB
5 GND
L1
VIN
4 LX
C
OUT
C
IN
LX should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace.
IC
EN
VIN
1
2
3
6 VOUT
5 GND
L1
4 LX
Output capacitor
must be near
RT8010
EN
Output
capacitor
must be near
RT8010/A
R1
R2
C
OUT
C
IN
C
IN
must be placed
to the VIN as close
as possible.
C
IN
must be placed
to the VIN as close
as possible.
LX should be
connected to
Inductor by wide
and short trace,
keep sensitive
components away
from this trace.
Figure 3
Layout note :
1. The distance that C
IN
connects to V
IN
is as close as possible (Under 2mm).
2. C
OUT
should be placed near RT8010/A.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8010/A-10 February 2015
www.richtek.com
3
RT8010/A
Functional Pin Description
Pin No.
RT8010
1
2
3
4
5
6
RT8010A
6, 8, 16
7
9, 10, 11, 12
13, 14, 15
1, 2, 3, 5
4
Pin Name
IC
EN
VIN
LX
GND
FB/VOUT
Pin Function
Internal Connection. Leave floating and do not make connection
to this pin.
Chip Enable (Active High).
Power Input. (Pin 9 and Pin 10 must be connected with Pin 11).
Pin for Switching. (Pin 13 must be connected with Pin 14).
Ground.
Feedback/Output Voltage.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum thermal dissipation.
7 (Exposed Pad) 17 (Exposed Pad) GND
Function Block Diagram
EN
VIN
OSC &
Shutdown
Control
Slope
Compensation
Current
Sense
RS1
Current
Limit
Detector
FB/VOUT
Error
Amplifier
RC
COMP
PWM
Comparator
Control
Logic
Driver
LX
UVLO &
Power Good
Detector
RS2
V
REF
GND
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS8010/A-10 February 2015
RT8010/A
Absolute Maximum Ratings
(Note 1)
6.5V
−0.3V
to V
IN
−0.3V
to (V
IN
+ 0.3V)
−4.5V
to 7.5V
2A
0.833W
Supply Input Voltage -------------------------------------------------------------------------------------------------
EN, FB Pin Voltage --------------------------------------------------------------------------------------------------
LX Pin Switch Voltage -----------------------------------------------------------------------------------------------
<20ns -------------------------------------------------------------------------------------------------------------------
LX Pin Switch Current -----------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WDFN-6L 2x2 ---------------------------------------------------------------------------------------------------------
WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------- 1.47W
Package Thermal Resistance (Note 2)
WDFN-6L 2x2,
θ
JA
---------------------------------------------------------------------------------------------------- 120°C/W
WDFN-6L 2x2,
θ
JC
--------------------------------------------------------------------------------------------------- 20°C/W
WQFN-16L 3x3,
θ
JA
-------------------------------------------------------------------------------------------------- 68°C/W
WQFN-16L 3x3,
θ
JC
------------------------------------------------------------------------------------------------- 7.5°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)
HBM (Human Body Model) ----------------------------------------------------------------------------------------- 2kV
(Note 4)
Recommended Operating Conditions
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
(V
IN
= 3.6V, V
OUT
= 2.5V, L = 2.2μH, C
IN
= 4.7μF, C
OUT
= 10μF, T
A
= 25°C, I
MAX
= 1A unless otherwise specified)
Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Reference Voltage
Adjustable Output Range
Symbol
V
IN
I
Q
I
SHDN
V
REF
V
OUT
V
OUT
V
OUT
Test Conditions
Min
2.5
Typ
--
50
0.1
0.6
--
--
--
--
--
--
Max
5.5
70
1
0.612
V
IN
0.2V
3
3
3
3
3
Unit
V
A
A
V
V
I
OUT
= 0mA, V
FB
= V
REF
+ 5%
EN = GND
For Adjustable Output Voltage
(Note 5)
V
IN
= 2.5V to 5.5V, V
OUT
= 1V
0A < I
OUT
< 1A
V
IN
= 2.5V to 5.5V, V
OUT
= 1.2V
0A < I
OUT
< 1A
V
IN
= 2.5V to 5.5V, V
OUT
= 1.5V
0A < I
OUT
< 1A
V
IN
= 2.5V to 5.5V, V
OUT
= 1.6V
0A < I
OUT
< 1A
V
IN
= 2.5V to 5.5V, V
OUT
= 1.8V
0A < I
OUT
< 1A
--
--
0.588
V
REF
3
3
3
3
3
Output Voltage
Accuracy
Fix
V
OUT
V
OUT
V
OUT
%
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8010/A-10 February 2015
www.richtek.com
5
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