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PDF RT9072B Data sheet ( Hoja de datos )
| Número de pieza | RT9072B | |
| Descripción | Low Dropout Voltage Linear Regulator | |
| Fabricantes | Richtek Technology | |
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RT9072A/B
80V, Low Dropout Voltage Linear Regulator
General Description
The RT9072A/B is a high voltage (80V operation), low
quiescent current, low dropout linear regulator. The
device supplies 20mA output current with a maximum
dropout voltage of 230mV. Its low quiescent and
shutdown currents (23A operating and 3A shutdown)
are ideal for use in battery-powered and/or high voltage
systems. Ground current is well-controlled in all
conditions, including dropout.
The RT9072A/B operates with any reasonable output
capacitors including 1F low-ESR ceramic types. It
features excellent line and load transient responses.
Internal protection circuitry includes reverse-battery
protection, current limiting, thermal shutdown, and
reverse current protection. Output voltage accuracy is
±3% over the entire line, load, and temperature range.
The RT9072A/B has an adjustable output voltage
(1.25V to 60V). It is available in the SOT-23-5 package.
Applications
Low Current, High Voltage Regulators
Battery Powered Applications
Telecom and Datacom Applications
Automotive Applications
Features
Wide Input Voltage Range: 4.5V to 80V
Low Quiescent Current : 23A Operating and 3A
Shutdown
Low Dropout Voltage: 180mV (typical) at 20mA
Adjustable (1.25V to 60V) Output Voltage
2% Initial Output Tolerance
3%Output Tolerance over Line, Load,
Temperature Range
Stable with 1F Output Capacitor
Stable with Aluminum, Tantalum or Ceramic
Capacitors
No Reverse-Current Protection Diode Needed
80V Reverse-Battery Protection
Internal Current Limit
Internal Thermal Shutdown Protection
Marking Information
RT9072AGB
4Y=DNN
4Y= : Product Code
DNN : Date Code
RT9072BGB
4X=DNN
4X= : Product Code
DNN : Date Code
Simplified Application Circuit
RT9072A/B
VIN VIN VOUT
VOUT
CIN R1 CCOMP COUT
FB
SHDN/
SHDN
R2
GND
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9072A/B-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT9072A/B
Absolute Maximum Ratings (Note 1)
VIN Pin Voltage--------------------------------------------------------------------------------------------------------80V to 90V
SHDN/S̅̅̅H̅̅D̅̅N̅̅ Pin Voltage ------------------------------------------------------------------------------------------ 0.3V to 60V
VOUT to GND Voltage ----------------------------------------------------------------------------------------------- 80V to 80V
VOUT to VIN Voltage-------------------------------------------------------------------------------------------------80V to 80V
FB Pin Voltage ---------------------------------------------------------------------------------------------------------0.3V to 7V
Power Dissipation, PD @ TA = 25C
SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.45W
Package Thermal Resistance (Note 2)
SOT-23-5, JA----------------------------------------------------------------------------------------------------------218.1C/W
Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------260C
Junction Temperature ------------------------------------------------------------------------------------------------ 150C
Storage Temperature Range --------------------------------------------------------------------------------------- 65C to 150C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Model) -------------------------------------------------------------------------------------------------200V
Recommended Operating Conditions (Note 4)
Supply Input Voltage -------------------------------------------------------------------------------------------------4.5V to 80V
Ambient Temperature Range--------------------------------------------------------------------------------------- 40C to 85C
Junction Temperature Range --------------------------------------------------------------------------------------40C to 125C
Electrical Characteristics
(4.5V < VIN < 80V, VS̅̅̅H̅̅D̅̅N̅̅ = 2V (RT9072A), VSHDN = 0V (RT9072B), FB pin connected to VOUT pin, COUT = 1F (ceramic), TA =
25C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Input Voltage
FB Pin Voltage
VIN ILOAD = 20mA
VIN = 12V, ILOAD = 100A
VFB
100A < ILOAD < 20mA
4.5 --
80
1.23 1.25 1.27
1.21 1.25 1.29
V
V
Line Regulation
Load Regulation
VLINE
VLOAD
VIN = 4.5V to 80V, ILOAD = 100A
VIN = 12V, ILOAD = 100A to 20mA
--
--
1 10 mV
3 25 mV
ILOAD = 100A
-- 9 50
Dropout Voltage
VDROP
ILOAD = 1mA
ILOAD = 10mA
-- 37 100
mV
-- 130 200
ILOAD = 20mA
-- 180 230
GND Pin Current
Output Voltage Noise
IGND
VON
ILOAD = 0mA
ILOAD = 20mA
COUT = 1F, ILOAD = 20mA, BW =
10Hz to 100kHz
-- 20 30
A
-- 750 1200
-- 120 -- VRMS
FB Pin Bias Current
IFB
-- 8 50 nA
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9072A/B-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Application Information
The RT9072A/B is a high input-voltage linear regulator
specifically designed to minimize external components.
The input voltage range is from 4.5V to 80V. The
device supplies 20mA of output current with a
maximum dropout voltage of 230mV.
Adjustable Output Voltage and Compensation
The adjustable output may be set to provide from 1.25V
to 80V, using external feedback voltage divider
resistors (Figure 1). To achieve the correct
compensation (with your external FB divider, use a
lower divider resistor (R2) value below 100k.
Calculate R1 according to the following formula : R2 =
R1 / (VOUT / 1.25V – 1). Then, calculate the
compensation capacitor (CCOMP) value according to
the following formula : CCOMP = 25s/R1
Added External NPN for High-Current Applications
Higher output currents and/or increased power
dissipation are possible using an external NPN output
transistor. VOUT drives the base of the transistor and
FB monitors the actual output voltage, as in normal
applications. The output (Figure 2) can be used.
Component Selection
A low-ESR capacitor such as ceramic type must be
connected between VIN and GND with short, wide
traces to bypass input noise. RT9072A/B is designed to
work with small input capacitor to reduce the cost from
high-voltage low-ESR requirement. To guarantee a
minimum 0.1F input capacitance, a ceramic 0.18F
input capacitor with an appropriate voltage rating is
recommended.
The RT9072A/B operates with any reasonable output
capacitor including low-ESR ceramic types. Low-ESR
aluminum and tantalum capacitor may also be used. A
minimum of 1F is recommended and much higher
values are also acceptable. Connect the output
capacitor between VOUT and GND with short, wide
traces to keep the circuit stable.
RT9072A/B
Thermal Considerations
The RT9072A/B’s high input-voltage capability and
high output current capability require careful use to
avoid over-heating the IC and activating the internal
thermal protection. To avoid thermal shutdown, do not
exceed the IC’s maximum operating junction
temperature range of 125C.
For continuous operation, do not exceed absolute
maximum junction temperature. The maximum power
dissipation depends on the thermal resistance of the IC
package, PCB layout, rate of surrounding airflow, and
difference between junction and ambient temperature.
The maximum power dissipation can be calculated by
the following formula :
PD(MAX) = (TJ(MAX) TA) / JA
where TJ(MAX) is the maximum junction temperature,
TA is the ambient temperature, and JA is the junction to
ambient thermal resistance.
For recommended operating condition specifications,
the maximum junction temperature is 125C. The
junction to ambient thermal resistance, JA, is layout
dependent. For SOT-23-5 package, the thermal
resistance, JA, is 218.1C/W on a standard JEDEC
51-7 four-layer thermal test board. The maximum
power dissipation at TA = 25C can be calculated by
the following formula :
PD(MAX) = (125C 25C) / (218.1C/W) = 0.45W for
SOT-23-5 package
The maximum power dissipation depends on the
operating ambient temperature for fixed TJ(MAX) and
thermal resistance, JA. The derating curve in Figure 3
allows the designer to see the effect of rising ambient
temperature on the maximum power dissipation.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9072A/B-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT9072B.PDF ] | |
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