|
|
PDF RT9073 Data sheet ( Hoja de datos )
| Número de pieza | RT9073 | |
| Descripción | 250mA Low-Dropout Linear Regulator | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de RT9073 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
®
RT9073
1μA IQ, 250mA Low-Dropout Linear Regulator
General Description
The RT9073 is a low-dropout (LDO) voltage regulators with
enable function that operates from 1.2V to 5.5V. It provides
up to 250mA of output current and offers low-power
operation in miniaturized packaging.
The features of low quiescent current as low as 1μA and
almost zero disable current is ideal for powering the battery
equipment to a longer service life. The RT9073 is stable
with the ceramic output capacitor over its wide input range
from 1.2V to 5.5V and the entire range of output load
current (0mA to 250mA).
Ordering Information
RT9073/N-
Package Type
B : SOT-23-5
U5 : SC-70-5
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Voltage
09 : 0.9V
1K : 1.05V
12 : 1.2V
15 : 1.5V
18 : 1.8V
19 : 1.9V
25 : 2.5V
27 : 2.7V
28 : 2.8V
29 : 2.9V
30 : 3.0V
33 : 3.3V
Special Request : Any Voltage
Between 0.9V and 3.3V under
specific business agreement
Pin Function
RT9073 : Without NC Pin
RT9073N : With NC Pin
Features
1μA Ground Current at no Load
PSRR = 75dB at 1kHz
Adjustable Output Voltage Available by Specific
Application
±2% Output Accuracy
250mA (VIN ≥ 2.3V) Output Current with EN
Low (0.1μA) Disable Current
1.2V to 5.5V Operating Input Voltage
Dropout Voltage : 0.5V at 250mA when VOUT ≥ 3V
Support Fixed Output Voltage 0.9V, 1.05V, 1.2V, 1.5V,
1.8V, 1.9V, 2.5V, 2.7V, 2.8V, 2.9V, 3V, 3.3V
Stable with Ceramic or Tantalum Capacitor
Current Limit Protection
Over Temperature Protection
SOT-23-5 and SC-70-5 Packages Available
Applications
Portable, Battery Powered Equipment
Ultra Low Power Microcontrollers
Notebook computers
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
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.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9073-02 March 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT9073
Parameter
Shutdown GND Current
Shutdown Leakage Current
EN Input Current
Line Regulation
Load Regulation
Power Supply Rejection
Ratio
Output Voltage Noise
Output Current Limit
Fold-Back Current Limit
Enable Input Logic-High
Voltage
Logic-Low
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Symbol
Test Conditions
VEN = 0V
VEN = 0V, VOUT = 0V
IEN
LINE
LOAD
PSRR
ILIM
VIH
VIL
VEN = 5.5V
1.2V VIN 1.5V
ILOAD = 10mA
1.5V VIN 1.8V
1.8V VIN 2.1V
2.1V VIN 5.5V
5mA < ILOAD < 250mA
VIN = 3V, ILOAD = 50mA,
COUT = 1F, VOUT = 2.5V, f = 1kHz
COUT = 1F,
ILOAD = 30mA,
BW = 10Hz to
100kHz,
VIN = VOUT + 2V
VOUT = 0.9V
VOUT = 1.2V
VOUT = 1.8V
VOUT = 3.3V
Peak output current
VOUT = 0.5V x VOUT(normal)
VIN = 5V
VIN = 5V
TSD ILOAD = 30mA, VIN 1.5V
TSD
Min Typ Max
-- 0.1 0.5
Unit
A
-- 0.1 0.5
A
-- -- 0.1 A
-- -- 0.6
-- -- 0.3
%
-- -- 0.1
-- -- 0.15
-- -- 1
%
-- 75 --
dB
-- 39 --
-- 46 --
-- 48 -- VRMS
-- 58 --
260 350 500 mA
150 270 390 mA
1.2 --
--
-- -- 0.4
V
-- 150 --
C
-- 20 --
C
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.
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. The dropout voltage is defined as VIN − VOUT, when VOUT is 98% of the normal value of VOUT.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9073-02 March 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Application Information
Like any low dropout linear regulator, the RT9073’s
external input and output capacitors must be properly
selected for stability and performance. Use a 1μF or larger
input capacitor and place it close to the IC's VIN and GND
pins. Any output capacitor meeting the minimum 1mΩ
ESR (Equivalent Series Resistance) requirement may be
used. Place the output capacitor close to the IC's VOUT
and GND pins. Increasing capacitance and decreasing ESR
can improve the circuit's PSRR and line transient response.
Enable
The RT9073 has an EN pin to turn on or turn off the
regulator, When the EN pin is in logic high, the regulator
will be turned on. The shutdown current is almost 0μA
typical. The EN pin may be directly tied to VIN to keep the
part on. The Enable input is CMOS logic and cannot be
left floating.
Adjustable Output Voltage Setting
Because of the small input current at the SNS pin, the
RT9073 with SNS pin also can work as an adjustable output
voltage LDO. Figure 3 gives the connections for the
adjustable output voltage application. The resistor divider
from VOUT to SNS sets the output voltage when in
regulation.
The voltage on the SNS pin sets the output voltage and is
determined by the values of R1 and R2. In order to keep
a good temperature coefficient of output voltage, the values
of R1 and R2 should be selected carefully to ignore the
temperature coefficient of input current at the SNS pin. A
current greater than 50μA in the resistor divider is
recommended to meet the above requirement. The
adjustable output voltage can be calculated using the
formula given in equation 1 :
VOUT
R1 + R2
R2
VSNS
(1)
where VSNS is determined by the output voltage selections
in the ordering information of RT9073.
When we choose 39kΩ and 15kΩ as R1 and R2
respectively, and select a 0.9V output at SNS pin, the
adjustable output voltage will be set to around 3.24V. Its
temperature coefficient in Figure 4 is still perfect in such
kind of application.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9073-02 March 2015
RT9073
3.30
3.29
3.28
3.27
3.26
3.25
3.24
3.23
3.22
3.21
3.20
-50
Output Voltage vs. Temperature
ILOAD = 1mA
-25 0
25 50 75 100 125
Temperature (°C)
Figure 4. Temperature Coefficient of Adjustable Output
Voltage
The minimum recommended 50μA in the resistor divider
makes the application no longer an ultra low quiescent
LDO. Figure 5 is another fine adjustable output voltage
application can keep the LDO still operating in low power
consumption. The fine fune range is recommended to be
less than 50mV (R1 ≤ 91kΩ) in order to keep a good
temperature coefficient of the output voltage.
VIN
1µF
RT9073
VOUT
SNS
EN
GND
R1
56pF/NC
1µF
Figure 5. Fine Adjustable Output Voltage Application
Circuit
There isn't extra current consumption in the above
application. But the temperature coefficient of output
voltage will be degraded by the input current at SNS pin.
If the tuning range is larger than 50mV, a compensation
capacitor (56pF) is required to keep the stability of output
voltage. The fine adjustable output voltage is calculated
using the formula given in equation2 :
VOUT VSNS + ISNS R1
(2)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT9073.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| RT9070B | Low Dropout Voltage Linear Regulator | Richtek Technology |
| RT9072A | Low Dropout Voltage Linear Regulator | Richtek Technology |
| RT9072B | Low Dropout Voltage Linear Regulator | Richtek Technology |
| RT9073 | 250mA Low-Dropout Linear Regulator | Richtek Technology |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |