
®
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 . Ca pable 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 availa ble including : PWM/LowDropout autoswitch and shutdown modes. The Internal
synchronous rectifier with low R
conduction loss at PWM mode. No external Schottky
diode is required in practical a pplication.
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 0.1 μA
when EN pin is pulled low.
dramatically reduces
DS(ON)
Features
2.5V to 5.5V Input Range
Output V oltage (Adjustable Output From 0.6V to V
``
` 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
IN
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 W DF N-6L 2x2
and WQFN-16L 3x3 package provides small PCB area
a pplication. Other features include soft start, lower internal
reference voltage with 2% accuracy, over temperature
protection, and over current protection.
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
Pin Configurations
(TOP VIEW)
GND
IC
EN
VIN
1
2
3
7
6
FB/VOUT
5
GND
4
LX
WDFN-6L 2x2 (RT8010)
GND
GND
FB/VOUT
WQFN-16L 3x3 (RT8010A)
Marking Information
For marking information, contact our sales re presentative
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.
DS8010/A-09 September 2012 www.richtek.com
©
IC
LXLXLX
13141516
VIN
17
EN
12
11
VIN
10
VIN
VIN
9
8765
IC
1
2
3
4
IC
GND
Note :
Richtek products are :
` 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.
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
)
1

RT8010/A
Typical Application Circuit
V
2.5V to 5.5V
2.5V to 5.5V
R1
⎛
⎜
REFOUT
⎝
⎞
1 x VV
+=
⎟
R2
⎠
IN
V
IN
L
C
IN
4.7µF
3
VIN
RT8010/A
2
EN VOUT
1
IC
GND
LX
4
6
5
2.2µH
Figure 1. Fixed V oltage Regulator
L
C
IN
4.7µF
3
VIN
RT8010/A
2
EN FB
1
IC
GND
LX
4
6
5
2.2µH
I
R2
C1
V
C
OUT
10µF
R1
R2
OUT
V
C
OUT
10µF
OUT
with R2 = 300kΩ to 60kΩ so the IR2 = 2μA to 10μA,
and (R1 x C1) should be in the range between 3x10
Figure 2. Adjustable V oltage Regulator
Layout Guide
RT8010/A_FIX
1
IC
2
EN
34
VIN
C
IN
CIN must be placed
to the VIN as close
as possible.
Layout note :
1. The distance that C
2. C
should be placed near RT8010/A.
OUT
6
VOUT
5
GND
LX
LX should be connected
to Inductor by wide and
short trace, keep
sensitive components
away from this trace.
connects to VIN is as close as possible (Under 2mm).
IN
L1
Output capacitor
must be near
RT8010
C
OUT
-6
and 6x10
Figure 3
-6
for component selection.
RT8010/A_ADJ
IC
1
EN
2
VIN
3
C
IN
CIN must be placed
to the VIN as close
as possible.
FB
6
GND
5
LX
4
LX should be
connected to
Inductor by wide
and short trace,
keep sensitive
components away
from this trace.
L1
Output
capacitor
must be near
RT8010/A
C
OUT
R1
R2
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
DS8010/A-09 September 2012www.richtek.com
2

Functional Pin Description
Pin No.
RT8010 RT8010A
1 6, 8, 16 IC
2 7 EN
3 9, 10, 11, 12 VIN Power Input. (Pin 9 and Pin 10 must be c onnected with Pin 11).
4 13, 14, 15 LX Pin for Switching. (Pin 13 m ust be c onnected with Pin 14).
5 1, 2, 3, 5 GND Ground.
6 4 FB/VOUT Feedback/Output Voltage.
Pin Name Pin Function
RT8010/A
Internal Connection. Leave floating and do not make connection
to this pin.
Chip Enable ( Active High).
7 (Expo sed Pad) 17 (Exposed Pad) GND
Function Block Diagram
Slope
Compensation
FB/VOUT
Error
Amplifier
RC
COMP
Ground. The exposed pad must be soldered to a large PCB and
connec ted to GND for maximum thermal dissipation.
EN VIN
OSC &
Shutdown
Control
Current
Sense
PWM
Comparator
UVLO &
Power Good
Detector
V
REF
Current
Limit
Detector
Control
Logic
Driver
RS1
LX
RS2
GND
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)
Supply Input V oltage------------------------------------------------------------------------------------------------- 6.5V
EN, FB Pin Voltage -------------------------------------------------------------------------------------------------- −0.3V to V
LX Pin Switch Voltage ----------------------------------------------------------------------------------------------- −0.3V to (V
<20ns ------------------------------------------------------------------------------------------------------------------- −4.5V to 7.5V
LX Pin Switch Current ----------------------------------------------------------------------------------------------- 2A
Power Dissipation, P
@ TA = 25°C
D
WDFN-6L 2x2 --------------------------------------------------------------------------------------------------------- 0.833W
WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------- 1.47W
Package Thermal Re sistance (Note 2)
W DFN-6L 2x2, θJA---------------------------------------------------------------------------------------------------- 120°C/W
WDFN-6L 2x2, θJC--------------------------------------------------------------------------------------------------- 20°C/W
WQF N-16L 3x3, θJA-------------------------------------------------------------------------------------------------- 68°C/W
WQFN-16L 3x3, θJC------------------------------------------------------------------------------------------------- 7.5°C/W
Lead Temperature (Soldering, 10 sec.)-------------------------------------------------------------------------- 260°C
Storage T emperature Range --------------------------------------------------------------------------------------- −65°C to 150°C
Junction T emperature------------------------------------------------------------------------------------------------ 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model)----------------------------------------------------------------------------------------- 2kV
IN
+ 0.3V)
IN
Recommended Operating Conditions (Note 4)
Supply Input V oltage------------------------------------------------------------------------------------------------- 2.5V to 5.5V
Junction T emperature Range---------------------------------------------------------------------------------------
Ambient T emperature Range---------------------------------------------------------------------------------------
−40°C to 125°C
−40°C to 85°C
Electrical Characteristics
(V
= 3.6V, V
IN
Input Volt age Ra nge VIN 2.5 -- 5.5 V
Qui escent Cu rrent IQ I
Shutdown Current I
Re f erenc e Volt a ge V
Adjustable Output Range V
Output Voltage
Accuracy
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
4
©
= 2.5V, L = 2.2μH, C
OUT
= 4.7μF, C
IN
OUT
= 10μF, T
= 25°C, I
A
= 1A unless otherwise specified)
MAX
Parameter Symbol Test Conditions Min Typ Max Unit
Fix
= 0mA, VFB = V
OUT
EN = G ND -- 0.1 1 μA
SHDN
For Adjustable Output Voltage 0.588 0.6 0.612 V
REF
(Note 5) V
OUT
V
= 2.5V to 5.5V, V
IN
0A < I
V
IN
0A < I
V
IN
0A < I
V
IN
0A < I
V
IN
0A < I
< 1A
OUT
= 2.5V to 5.5V, V
< 1A
OUT
= 2.5V to 5.5V, V
< 1A
OUT
= 2.5V to 5.5V, V
< 1A
OUT
= 2.5V to 5.5V, V
< 1A
OUT
ΔV
ΔV
ΔV
ΔV
ΔV
OUT
OUT
OUT
OUT
OUT
+ 5% -- 50 70 μA
REF
OUT
OUT
OUT
OUT
OUT
= 1V
= 1.2V
= 1.5V
= 1.6V
= 1.8V
-- V
REF
−3 -- 3
−3 -- 3
−3 -- 3
−3 -- 3
−3 -- 3
− 0.2V V
IN
DS8010/A-09 September 2012www.richtek.com
%

RT8010/A
Parameter Symbol Test Conditions Min Typ Max Unit
= V
V
ΔV
OUT
Fix
Outpu t Volt age
ΔV
Accuracy
Adjustable
FB I nput Curre nt
P-MOSF ET RON R
N-MOSFET RON R
P-Channel Current Limit
EN High-Level Input Voltage
EN Low-Level Input Voltage
OUT
ΔV
OUT
V
I
FB
DS(ON)_P
DS(ON)_N
V
I
LIM_P
VIN = 2.5V to 5.5V
V
EN_H
VIN = 2.5V to 5.5V
V
EN_L
IN
V
OUT
V
= V
IN
V
OUT
V
= V
IN
0A < I
= VIN
FB
I
OUT
I
OUT
= 2.5V to 5.5 V
IN
+ ΔV to 5.5V (Note 6)
OUT
= 2.5V, 0A < I
+ ΔV to 5.5V (Note 6)
OUT
= 3.3V, 0A < I
+ ΔV to 5.5V (Note 6)
OUT
< 1A
OUT
= 200 mA
= 200 mA
OUT
OUT
V
V
V
V
IN
IN
IN
IN
< 1A
< 1A
= 3.6V
= 2.5V
= 3.6V
= 2.5V
−3
-- 3
%
−3
−3
-- 3
-- 3 %
−50 -- 50 nA
-- 0.28 -Ω
-- 0.38 --
-- 0.25 -Ω
-- 0.35 --
1.4 1.5 -- A
1.5 -- -V
-- -- 0.4
Under Voltage Loc k Ou t thr es hold UVLO -- 1.8 -- V
Hysteresis -- 0.1 -- V
Oscillator Frequency
Ther m al S hutd own Temper atu re
V
f
OSC
T
SD
= 3.6V, I
IN
OUT
= 100mA
-- 160 --
1.2 1.5 1.8 MHz
°C
Ma x . Duty Cy cle 100 -- -- %
LX Leakage Curr ent
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. θ
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. ΔV = I
is measured at T
JA
measured at the exposed pad of the package.
x P
OUT
RDS(ON)
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
A
= 3.6V, V
V
IN
= 0V or V
LX
= 3.6V −1
LX
-- 1
μA
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
DS8010/A-09 September 2012 www.richtek.com
©
5