Linear Regulator. RT9072B Datasheet

RT9072B Regulator. Datasheet pdf. Equivalent

RT9072B Datasheet
Recommendation RT9072B Datasheet
Part RT9072B
Description Low Dropout Voltage Linear Regulator
Feature RT9072B; RT9072A/B 80V, Low Dropout Voltage Linear Regulator General Description The RT9072A/B is a high vo.
Manufacture Richtek Technology
Datasheet
Download RT9072B Datasheet




Richtek Technology RT9072B
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



Richtek Technology RT9072B
RT9072A/B
Ordering Information
RT9072A/B
Package Type
B : SOT-23-5
Lead Plating System
G : Green (Halogen Free and Pb Free)
A : Low Shutdown
B : High Shutdown
Note :
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
VOUT
FB
54
23
VIN GND SHDN/
SHDN
SOT-23-5
Functional Pin Description
Pin No.
1
2
3
4
5
Pin Name
Pin Function
VIN
Power Input. Bypass VIN with a 0.18F or larger capacitor with
adequate voltage rating.
GND
Ground.
SHDN
(RT9072B)
S̅̅̅H̅̅D̅̅N̅̅
(RT9072A)
Shutdown Control Input. Connect SHDN of RT9072B high to disable
the output voltage and reduce the IC’s quiescent current to 3A
(typical). Connect SHDN low to enable the output. SHDN is a
high-voltage pin and can be connected directly to a high-voltage input
less than 60V.
Shutdown Control Input. Connect S̅̅̅H̅̅D̅̅N̅̅ of RT9072A low to disable
the output voltage and reduce the IC’s quiescent current to 3A
(typical). Connect S̅̅̅H̅̅D̅̅N̅̅ high to enable the output. S̅̅̅H̅̅D̅̅N̅̅ is a
high-voltage pin and can be connected directly to a high-voltage input
less than 60V.
FB
Feedback Voltage Input. Connect to the center tap of a resistor divider
for setting the output voltage.
VOUT
Output Voltage Pin. The VOUT pin supplies power to the load. A
minimum output capacitor of 1F is required for stable operation.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9072A/B-00 May 2016



Richtek Technology RT9072B
Function Block Diagram
RT9072A/B
VIN
SHDN/
SHDN
-+
VREF
Current
Limit
Over-
Temperature
Protection
VOUT
FB
GND
Operation
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. Its 23A
quiescent and 3A shutdown currents make it ideal for
use in battery-powered applications. Unlike many PNP
LDO regulators, ground current does not increase
much in dropout conditions.
Output Transistor
The RT9072A/B includes a built-in PNP output
transistor configured for low dropout voltage. The
output transistor blocks reverse current from output to
input node if the output voltage is held higher than the
input voltage (such as in battery-backup applications).
Error Amplifier
The Error Amplifier compares the output feedback
voltage at FB to an internal reference voltage and
controls the PNP output transistor's base current to
maintain output voltage regulation.
Current Limit Protection
The RT9072A/B provides a current limit function to
prevent damage during output over-load or
shorted-circuit conditions. The output current is
detected by an internal current-sense transistor.
Over-Temperature Protection
The over-temperature protection function will turn off
the PNP output transistor when the internal junction
temperature exceeds 150°C (typ.). Once the junction
temperature cools down by approximately 20°C, the
regulator will automatically resume operation.
Reverse-Battery Protection
The RT9072A/B VIN can withstand reverse voltages as
high as 80V. Both the IC and the load are protected
and no negative voltage will appear at the output.
Reverse-Output Protection
The RT9072A/B protects against current flow to the
input (VIN) when the output voltage exceeds VIN.
If the input is left open circuit or grounded, the FB pin
will act like a resistor (typically 10k) in series with a
diode when pulled above ground. If the FB pin is
connected to a resistor divider now and the output
voltage is held higher than the input voltage, a current
will conduct from output via the resistor divider and FB
node to ground. Because the current is limited by the
resistor divider and FB internal resistor, no additional
output blocking diode is needed if the limited current is
acceptable.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9072A/B-00 May 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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