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RT9068-25GSP

P1-P3P4-P6P7-P9P10-P12P13-P15
RT9068
4
DS9068-06 March 2017www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Operation
The RT9068 is a high input-voltage linear regulator
specifically designed to minimize external components.
The input voltage range is from 4.5V to 60V. The device
supplies 50mA of output current with a maximum dropout
voltage of 300mV. Its 30μA quiescent and 2μA 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 RT9068 includes a built-in PNP output transistor
configured for low dropout voltage. The output transistor
blocks reverse current if the output voltage is held higher
than the input voltage (such as in battery-backup
applications) so no additional output blocking diode is
needed.
Error Amplifier
The Error Amplifier compares the output feedback voltage
from an internal feedback voltage divider (fixed output
versions) or FB (adjustable output versions) to an internal
reference voltage and controls the PNP output transistor's
base current to maintain output voltage regulation. The
RT9068's internal dividers are placed between SENSE and
GND and have a divider resistance of about 1MΩ.
Current Limit Protection
The RT9068 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 155°C (typ.). Once the junction
temperature cools down by approximately 5°C, the
regulator will automatically resume operation.
Reverse-Battery Protection
The RT9068 inputs (VIN and SHDN) can withstand reverse
voltages as high as −60V. Both the IC and the load are
protected, as long as the load impedance is 500Ω or less.
In these conditions, the output voltage is guaranteed to
be no more negative than −1V with the maximum negative
input voltage. In battery-powered applications, no
additional protection against battery reversal is typically
needed.
Reverse-Output Protection
The RT9068 protects against current flow to the input (VIN)
when the output voltage exceeds VIN. This simplifies
battery and capacitive “keep-alive” circuits since they
need no additional output blocking diode.
Shutdown Input (8 Pin Versions)
The RT9068 SHDN input is an active-high input that turns
off the output transistor and reduces the quiescent current
to 2μA typical. Connect SHDN to a voltage below 0.6V for
normal operation.
RT9068
5
DS9068-06 March 2017 www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit
Input Supply
Operational V
IN
V
IN
0 < I
OUT
< 50mA 4.5 -- 60 V
Quiescent Current I
Q
V
IN
= 24V, V
SHDN
= 0V -- 30 40 A
Shutdown Current I
SHDN
V
IN
= 24V, V
SHDN
= 2.5V, V
OUT
= 0 -- 2 15 A
Input Reverse Leakage
Current
IV
INr
V
IN
= 60V, V
OUT
= 0V -- -- 0.1 mA
Output Voltage and Current
Output Current Limit I
LIM
120 -- 300 mA
Line Regulation V
LINE
5.5V < V
IN
< 60V, I
OUT
= 50mA
-- 0.5 -- %
Load Regulation V
LOAD
0.1mA < I
OUT
< 50mA -- 0.7 -- %
Absolute Maximum Ratings (Note 1)
VIN to GND ------------------------------------------------------------------------------------------------------------------- −60V to 80V
SHDN to GND --------------------------------------------------------------------------------------------------------------- −60V to 80V
VOUT to GND --------------------------------------------------------------------------------------------------------------- −40V to 80V
SENSE to GND ------------------------------------------------------------------------------------------------------------- −30V to 35V
VIN to VOUT/SENSE when |VIN| ≥ |VOUT| (Normal Operation or Reverse-Battery Condition) -------- −60V to 80V
VIN to VOUT/SENSE when VOUT ≥ VIN ≥ 0 (Reverse-VOUT Condition) ------------------------------------ −35V
FB ------------------------------------------------------------------------------------------------------------------------------ −0.3V to 10V
FB Current ------------------------------------------------------------------------------------------------------------------- −6mA to 6mA
Power Dissipation, P
D
@ T
A
= 25°C
MSOP-8 ---------------------------------------------------------------------------------------------------------------------- 2.1W
SOP-8 ------------------------------------------------------------------------------------------------------------------------- 3.26W
Package Thermal Resistance (Note 2)
MSOP-8, θ
JA
----------------------------------------------------------------------------------------------------------------- 47.4°C/W
MSOP-8, θ
JC
---------------------------------------------------------------------------------------------------------------- 11.9°C/W
SOP-8, θ
JA
------------------------------------------------------------------------------------------------------------------- 30.6°C/W
SOP-8, θ
JC
------------------------------------------------------------------------------------------------------------------- 3.4°C/W
Junction Temperature ------------------------------------------------------------------------------------------------------ 150°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
Supply Input Voltage ------------------------------------------------------------------------------------------------------- 4.5V to 60V
Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------- −40°C to 85°C
(4.5V < V
IN
< 60V, V
SHDN
= 0V, T
A
= 25°C, unless otherwise specified)
RT9068
6
DS9068-06 March 2017www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Parameter Symbol Test Conditions Min Typ Max Unit
FB Regulation
Voltage
RT9068 V
FB
0 < I
OUT
< 50mA 1.225 1.25 1.275 V
Output Voltage
RT9068-25
V
OUT
0 < I
OUT
< 50mA 2.45 2.5 2.55
V
RT9068-33 0 < I
OUT
< 50mA 3.24 3.3 3.36
RT9068-50 5.4V < V
IN
< 60V, 0 < I
OUT
< 50mA 4.9 5 5.1
FB Input Bias
Current
RT9068 I
FB
-- 20 100 nA
Output Voltage with Reverse
Polarity V
IN
V
ROUT
V
IN
= 60V, R
L
= 500 -- -- 1 V
Dropout Voltage V
DROP
I
OUT
= 1mA -- 15 80
mV
I
OUT
= 10mA -- 55 150
I
OUT
= 50mA -- 150 300
Power Supply Rejection Rate PSRR f = 1kHz, I
OUT
= 50mA -- 60 -- dB
Output Noise Voltage V
ON
I
OUT
= 50mA, f = 10Hz to 100kHz -- 200 -- V
RMS
Shutdown
Shutdown Output Voltage V
OUTSD
SHDN = V
IN
-- -- 100 mV
SHDN High Threshold V
IH
-- 1.6 2.2 V
SHDN Low Threshold V
IL
0.6 1.2 -- V
SHDN Input Bias Current I
SHDN
SHDN = V
IN
-- 0.6 1.2
A
V
SHDN
= 0V -- -- 0.1
Thermal Protection
Thermal Shutdown T
SD
145 155 165 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. θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θ
JC
is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
P1-P3P4-P6P7-P9P10-P12P13-P15

RT9068-25GSP

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LDO, FIXED, 2.5V, 0.05A, SOP-8
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