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PDF RT8010 Data sheet ( Hoja de datos )
| Número de pieza | RT8010 | |
| Descripción | High Efficiency PWM Step-Down DC/DC Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
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 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.
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
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Configurations
(TOP VIEW)
IC 1
EN 2
VIN 3
16 15 14 13
GND 1
12 VIN
6 FB/VOUT
GND 2
5 GND
GND 3
7 4 LX
FB/VOUT 4
11 VIN
10 VIN
17
9 VIN
5678
WDFN-6L 2x2 (RT8010)
WQFN-16L 3x3 (RT8010A)
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8010/A-10 February 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8010/A
Absolute Maximum Ratings (Note 1)
Supply Input Voltage ------------------------------------------------------------------------------------------------- 6.5V
EN, FB Pin Voltage -------------------------------------------------------------------------------------------------- −0.3V to VIN
LX Pin Switch Voltage ----------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
<20ns ------------------------------------------------------------------------------------------------------------------- −4.5V to 7.5V
LX Pin Switch Current ----------------------------------------------------------------------------------------------- 2A
Power Dissipation, PD @ TA = 25°C
WDFN-6L 2x2 --------------------------------------------------------------------------------------------------------- 0.833W
WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------- 1.47W
Package Thermal Resistance (Note 2)
WDFN-6L 2x2, θJA ---------------------------------------------------------------------------------------------------- 120°C/W
WDFN-6L 2x2, θJC --------------------------------------------------------------------------------------------------- 20°C/W
WQFN-16L 3x3, θJA -------------------------------------------------------------------------------------------------- 68°C/W
WQFN-16L 3x3, θJC ------------------------------------------------------------------------------------------------- 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
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, L = 2.2μH, CIN = 4.7μF, COUT = 10μF, TA = 25°C, IMAX = 1A unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ
Max
Unit
Input Voltage Range
Quiescent Current
Shutdown Current
Reference Voltage
Adjustable Output Range
Output Voltage
Accuracy
Fix
VIN
IQ
ISHDN
VREF
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
IOUT = 0mA, VFB = VREF + 5%
EN = GND
For Adjustable Output Voltage
(Note 5)
VIN = 2.5V to 5.5V, VOUT = 1V
0A < IOUT < 1A
VIN = 2.5V to 5.5V, VOUT = 1.2V
0A < IOUT < 1A
VIN = 2.5V to 5.5V, VOUT = 1.5V
0A < IOUT < 1A
VIN = 2.5V to 5.5V, VOUT = 1.6V
0A < IOUT < 1A
VIN = 2.5V to 5.5V, VOUT = 1.8V
0A < IOUT < 1A
2.5 -- 5.5 V
-- 50 70 A
-- 0.1
0.588 0.6
1
0.612
A
V
VREF -- VIN 0.2V V
3 --
3
3 --
3
3 -- 3 %
3 --
3
3 --
3
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8010/A-10 February 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
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 CIN and COUT.
Inductor Selection
For a given input and output voltage, the inductor value
and operating frequency determine the ripple current. The
ripple current ΔIL increases with higher VIN and decreases
with higher inductance.
IL
=
VOUT
f L
1
VOUT
VIN
Having a lower ripple current reduces the ESR losses in
the output capacitors and the output voltage ripple. Highest
efficiency operation is achieved at low frequency with small
ripple current. This, however, requires a large inductor.
A reasonable starting point for selecting the ripple current
is ΔIL = 0.4(IMAX). The largest ripple current occurs at the
highest VIN. To guarantee that the ripple current stays
below a specified maximum, the inductor value should be
chosen according to the following equation :
L
=
f
VOUT
IL(MAX)
1
VOUT
VIN(MAX)
Inductor Core Selection
Once the value for L is known, the type of inductor must
be selected. High efficiency converters generally cannot
afford the core loss found in low cost powdered iron cores,
forcing the use of more expensive ferrite or mollypermalloy
cores. Actual core loss is independent of core size for a
fixed inductor value but it is very dependent on the
inductance selected. As the inductance increases, core
losses decrease. Unfortunately, increased inductance
requires more turns of wire and therefore copper losses
will increase.
Ferrite designs have very low core losses and are preferred
at high switching frequencies, so design goals can
concentrate on copper loss and preventing saturation.
Ferrite core material saturates “hard”, which means that
inductance collapses abruptly when the peak design
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8010/A-10 February 2015
RT8010/A
current is exceeded. This results in an abrupt increase in
inductor ripple current and consequent output voltage ripple.
Do not allow the core to saturate!
Different core materials and shapes will change the size/
current and price/current relationship of an inductor.
Toroid or shielded pot cores in ferrite or permalloy materials
are small and don't radiate energy but generally cost more
than powdered iron core inductors with similar
characteristics. The choice of which style inductor to use
mainly depends on the price vs size requirements and
any radiated field/EMI requirements.
CIN and COUT Selection
The input capacitance, CIN, is needed to filter the
trapezoidal current at the source of the top MOSFET. To
prevent large ripple voltage, a low ESR input capacitor
sized for the maximum RMS current should be used. RMS
current is given by :
IRMS
=
IOUT(MAX)
VOUT
VIN
VIN
VOUT
1
This formula has a maximum at VIN = 2VOUT, where
IRMS = IOUT/2. This simple worst-case condition is
commonly used for design because even significant
deviations do not offer much relief. Note that ripple current
ratings from capacitor manufacturers are often based on
only 2000 hours of life which makes it advisable to further
derate the capacitor, or choose a capacitor rated at a higher
temperature than required. Several capacitors may also
be paralleled to meet size or height requirements in the
design.
The selection of COUT is determined by the Effective Series
Resistance (ESR) that is required to minimize voltage
ripple and load step transients, as well as the amount of
bulk capacitance that is necessary to ensure that the
control loop is stable. Loop stability can be checked by
viewing the load transient response as described in a later
section. The output ripple, ΔVOUT, is determined by :
VOUT
IL
ESR+
1
8fCOUT
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RT8010.PDF ] | |
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