®
RT9068
60V, 30μA I
Q
, Low Dropout Voltage Linear Regulator
μ
General Description
The RT9068 family are high voltage (60V operation), low
quiescent current low dropout linear regulators capable of
supplying 50mA of output current with a maximum dropout
voltage of 300mV. The low quiescent and shutdown
currents (30μA operating and 2μA shutdown) are ideal for
use in battery-powered and/or high voltage systems.
Ground current is well-controlled in all conditions, including
dropout.
The RT9068 family operates with any reasonable output
capacitors including 1μF low-ESR ceramic types and
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
±2%
over
the entire line and load range.
These devices are available in 3 fixed-output versions
(2.5V, 3.3V, 5V) as well as a version that supports an
adjustable output voltage (1.25V to 60V). All versions
come in SOP-8 and MSOP-8 packages with an exposed
pad for high power dissipation.
Features
Wide Input Voltage Range : 4.5V to 60V
Low Quiescent Current : 30μA Operating and 2μA
μ
μ
Shutdown
Low Dropout Voltage : 300mV Maximum at 50mA
Fixed (2.5V, 3.3V, 5V) and Adjustable (1.25V to 60V)
Versions
±
2% Output Tolerance
Stable with 1μF Output Capacitor (Aluminum,
μ
Tantalum or Ceramic)
Inherent Reverse-Current Protection (No diode
needed)
−
60V Reverse-Battery Protection
Applications
Low Current, High Voltage Regulators
Battery Powered Applications
Telecom and Datacom Applications
Automotive Application
Typical Application Circuit
V
IN
4.5V to 60V
RT9068
C
IN
0.18µF
VIN
VOUT
SENSE
SHDN
GND
C
OUT
1µF
V
OUT
2.5V/3.3V/5V
V
IN
4.5V to 60V
RT9068
C
IN
0.18µF
VIN
VOUT
SENSE
SHDN
GND
FB
V
OUT
1.25V to 25V
V
IN
4.5V to 60V
RT9068
VIN
VOUT
SENSE
FB
V
OUT
1.25V to 60V
R1
C
OUT
1µF
C
IN
0.18µF
C
COMP
R1
C
OUT
1µF
SHDN
R2
GND
R2
RT9068-25/33/50
RT9068 (Adjustable Up to 25V Output)
RT9068 (Adjustable Up to 60V Output)
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9068-07 April 2018
www.richtek.com
1
RT9068
Ordering and Marking Information
Part No.
RT9068-
25GFP
RT9068-
25GSP
RT9068-
33GFP
RT9068-
33GSP
RT9068-
50GFP
RT9068-
50GSP
RT9068
GFP
RT9068
GSP
Note :
Richtek products are :
½
Pin Configuration
(TOP VIEW)
VOUT
SENSE
NC
NC
8
2
3
4
Output
Voltage
Package
MSOP-8
Marking
Information
09=
2.5V
GND
7
SOP-8 Exposed
RT906825GSP
Pad–Option 1)
MSOP-8
0A=
9 6
5
VIN
GND
GND
SHDN
RT9068-25/33/50
MSOP-8
3.3V
SOP-8 Exposed
RT906833GSP
Pad–Option 1)
MSOP-8
0B=
VOUT
SENSE
FB
NC
8
2
3
4
GND
7
5V
SOP-8 Exposed
RT906850GSP
Pad–Option 1)
MSOP-8
08=
9 6
5
VIN
GND
GND
SHDN
RT9068
MSOP-8
Adjustable
SOP-8 Exposed
RT9068GSP
Pad–Option 1)
VOUT
SENSE
NC
NC
2
3
4
8
VIN
GND
GND
SHDN
GND
9
7
6
5
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
RT9068-25/33/50
SOP-8
Suitable for use in SnPb or Pb-free soldering processes.
½
VOUT
SENSE
FB
NC
2
3
4
8
VIN
GND
GND
SHDN
GND
9
7
6
5
RT9068
SOP-8
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9068-07 April 2018
RT9068
Pin Description
Pin No.
RT9068-
RT9068GSP/GFP
25/33/50GSP/GFP
1
1
Name
Function
VOUT supplies power to the load. A minimum output
capacitor of 1F is required for stable operation.
Output voltage sense. For applications with V
OUT
25V,
SENSE can be connected to the output voltage to optimize
the control loop compensation.
For applications with V
OUT
> 25V (adjustable versions only),
SENSE must be left unconnected. Control loop compensation
is optimized by adding a feed-forward capacitor in the
feedback resistor divider connected to FB (see Adjustable
Output Voltage and Compensation section).
No internal connection.
Feedback input. Connect to the center tap of a resistor divider
for setting the output voltage. (Adjustable versions only)
No internal connection.
Shutdown control input (Active High). Connect SHDN high to
disable the output voltage and reduce the IC’s quiescent
current to 2A (typical). Connect SHDN low to enable the
output. SHDN is a high-voltage input (also able to withstand
reverse voltage) and can be connected directly to a
high-voltage input.
Ground. The exposed pad should be soldered to a large PCB
and connected to GND for maximum thermal dissipation.
Power input. Bypass VIN with a 0.18F or larger capacitor
with adequate voltage rating.
VOUT
2
2
SENSE
3
--
4
--
3
--
NC
FB
NC
5
5
SHDN
6, 7, 9*
8
*
exposed pad
6, 7, 9*
8
GND
VIN
Functional Block Diagram
VIN
Error Amp
SHDN
-
+
VOUT
Current Limit
VIN
Error Amp
SHDN
Current Limit
Over-
Temperature
Protection
VOUT
Over-
Temperature
Protection
SENSE
-
SENSE
FB
+
Reference
GND
Reference
GND
RT9068-25/33/50 (Fixed Output)
RT9068 (Adjustable Output)
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9068-07 April 2018
www.richtek.com
3
RT9068
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.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9068-07 April 2018
RT9068
Absolute Maximum Ratings
(Note 1)
−60V
to 80V
−60V
to 80V
−40V
to 80V
−30V
to 35V
−60V
to 80V
−35V
−0.3V
to 10V
VIN to GND -------------------------------------------------------------------------------------------------------------------
SHDN to GND ---------------------------------------------------------------------------------------------------------------
VOUT to GND ---------------------------------------------------------------------------------------------------------------
SENSE to GND -------------------------------------------------------------------------------------------------------------
VIN to VOUT/SENSE when |VIN|
≥
|VOUT| (Normal Operation or Reverse-Battery Condition) --------
VIN to VOUT/SENSE when VOUT
≥
VIN
≥
0 (Reverse-VOUT Condition) ------------------------------------
FB ------------------------------------------------------------------------------------------------------------------------------
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
-------------------------------------------------------------------------------------------------------------------
SOP-8,
θ
JC
-------------------------------------------------------------------------------------------------------------------
Junction Temperature ------------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------
Storage Temperature Range ---------------------------------------------------------------------------------------------
ESD Susceptibility (Note 3)
HBM (Human Body Model) -----------------------------------------------------------------------------------------------
(Note 4)
30.6°C/W
3.4°C/W
150°C
260°C
−65°C
to 150°C
2kV
Recommended Operating Conditions
Supply Input Voltage ------------------------------------------------------------------------------------------------------- 4.5V to 60V
Junction Temperature Range ---------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ---------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(4.5V < V
IN
< 60V, V
SHDN
= 0V, T
A
= 25°C, unless otherwise specified)
Parameter
Input Supply
Operational V
IN
Quiescent Current
Shutdown Current
Input Reverse Leakage
Current
Output Voltage and Current
Output Current Limit
Line Regulation
Load Regulation
Symbol
V
IN
I
Q
I
SHDN
IV
INr
Test Conditions
0 < I
OUT
< 50mA
V
IN
= 24V, V
SHDN
= 0V
V
IN
= 24V, V
SHDN
= 2.5V, V
OUT
= 0
V
IN
=
60V,
V
OUT
= 0V
Min
4.5
--
--
--
Typ
--
30
2
--
Max
60
40
15
0.1
Unit
V
A
A
mA
I
LIM
V
LINE
V
LOAD
5.5V < V
IN
< 60V, I
OUT
= 50mA
0.1mA < I
OUT
< 50mA
120
--
--
--
0.5
0.7
300
--
--
mA
%
%
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9068-07 April 2018
www.richtek.com
5
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