Linear Regulator. RT9070B Datasheet

RT9070B Regulator. Datasheet pdf. Equivalent

RT9070B Datasheet
Recommendation RT9070B Datasheet
Part RT9070B
Description Low Dropout Voltage Linear Regulator
Feature RT9070B; RT9070B 70V, Low Dropout Voltage Linear Regulator General Description The RT9070B is a high voltag.
Manufacture Richtek Technology
Datasheet
Download RT9070B Datasheet




Richtek Technology RT9070B
RT9070B
70V, Low Dropout Voltage Linear Regulator
General Description
The RT9070B is a high voltage (70V 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 RT9070B 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.
The RT9070B 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 70V
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
Stable with 1F Output Capacitor
Stable with Aluminum, Tantalum or Ceramic
Capacitors
No Reverse-Current Protection Diode Needed
70V Reverse-Battery Protection
Internal Current Limit
Internal Thermal Shutdown Protection
Marking Information
6A=DNN
6A= : Product Code
DNN : Date Code
Simplified Application Circuit
RT9070B
VIN VIN VOUT
VOUT
CIN R1 CCOMP COUT
FB
SHDN
GND
R2
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9070B-00 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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Richtek Technology RT9070B
RT9070B
Ordering Information
RT9070B
Package Type
B : SOT-23-5
Lead Plating System
G : Green (Halogen Free and Pb Free)
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
5
FB
4
23
VIN GND SHDN
SOT-23-5
Functional Pin Description
Pin No.
Pin Name
Pin Function
5
VOUT
Output Voltage Pin. The VOUT pin supplies power to the load. A minimum output
capacitor of 1F is required for stable operation.
4 FB
Feedback Voltage Input. Connect to the center tap of a resistor divider for setting
the output voltage.
2 GND Ground.
Shutdown Control Input. Connect SHDN of high to disable the output voltage and
3
SHDN
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.
1 VIN
Power Input. Bypass VIN with a 0.18F or larger capacitor with adequate voltage
rating.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9070B-00 April 2016



Richtek Technology RT9070B
Function Block Diagram
RT9070B
VIN
SHDN
-+
VREF
Current
Limit
Over-
Temperature
Protection
VOUT
FB
GND
Operation
The RT9070B is a high input-voltage linear regulator
specifically designed to minimize external components.
The input voltage range is from 4.5V to 70V. 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 RT9070B includes a built-in PNP output transistor
configured for low dropout voltage. The output transistor
blocks the large reverse current from output to input
node if the output voltage is held higher than the input
voltage (such as in battery-backup applications),
because there is no parasitic diode across VIN and
VOUT directly.
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 RT9070B 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.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9070B-00 April 2016
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 RT9070B VIN can withstand reverse voltages as
high as 70V. Both the IC and the load are protected
and no negative voltage will appear at the output.
Reverse-Output Protection
The RT9070B 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.
Shutdown Control
The RT9070B SHDN input is an active-high input that
turns off the output transistor and reduces the quiescent
current to 3A typical. Connect SHDN to a voltage
below 0.4V for normal operation.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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