®
RTQ9091
2A, Low Input Voltage, Ultra-Low Dropout LDO Regulator
with Enable
General Description
The RTQ9091 is a high performance positive voltage
regulator designed for use in applications requiring ultra-
low input voltage and
ultra-low dropout voltage at up to 2
amperes. It operates with an input voltage as low as 1.4V,
with output voltage programmable as low as 0.5V. The
RTQ9091 features ultra low dropout, ideal
for applications
where output voltage is very close to input voltage.
Additionally, the RTQ9091 has an enable pin to further
reduce power dissipation while shutdown. The RTQ9091
provides excellent regulation over variations in line, load
and temperature. The RTQ9091 is available in the SOP-8
(Exposed Pad) package. The output voltage can be set
by an external divider depending on how the FB pin is
configured.
Features
Input Voltage as Low as 1.4V
Ultra-Low Dropout Voltage 400mV at 2A
Over-Current Protection
Over-Temperature Protection
1μA Input Current in Shutdown Mode
μ
Enable Control
RoHS Compliant and Halogen Free
Applications
Ordering Information
RTQ9091
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
½
Telecom/Networking Cards
Motherboards/Peripheral Cards
Industrial Applications
Wireless Infrastructure
Set Top Box
Medical Equipment
Notebook Computers
Battery Powered Systems
Pin Configuration
(TOP VIEW)
IC
EN
VIN
NC
2
3
4
8
7
GND
ADJ
VOUT
NC
GND
9
6
5
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
½
SOP-8 (Exposed Pad)
Simplified Application Circuit
RTQ9091
V
IN
C1
Chip Enable
EN
GND
ADJ
R2
VIN
VOUT
R1
C2
V
OUT
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DSQ9091-00
November 2019
www.richtek.com
1
RTQ9091
Marking Information
RTQ9091GSP : Product Number
RTQ9091
GSPYMDNN
YMDNN : Date Code
Functional Pin Description
Pin No.
1
4, 5
2
Pin Name
IC
NC
EN
Pin Function
Internal connection. Keep this pin floating for normal operation.
No internal connection.
Chip enable (Active-High). Pulling this pin below 0.4V to turn the regulator off. The
device will be enabled if this pin is left open. Connect to VIN for controlling by VIN.
Power input. For regulation at full load, the input to this pin must be between
(V
OUT
+ 0.5V) and 6V. Minimum input voltage is 1.4V. A large bulk capacitance
should be placed closely to this pin to ensure that the input supply does not sag
below 1.4V. A minimum of 10F ceramic capacitor should be placed directly at this
pin.
Output of the regulator. A minimum of 10F capacitor should be placed directly at
this pin.
Feedback voltage input. If connected to the VOUT pin, the output voltage will be
set at 0.5V. If external feedback resistors are used, the output voltage will be
determined by the resistor ratio.
Ground. The exposed pad must be soldered to a large PCB and connected to GND
for maximum power dissipation.
3
VIN
6
7
VOUT
ADJ
8,
GND
9 (Exposed pad)
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DSQ9091-00
November 2019
RTQ9091
Functional Block Diagram
R
SENSE
VIN
V
PUMP
VOUT
-
+
V
IN
0.5µA
EN
Thermal
Shutdown
V
OUT
V
IN
+
-
V
IN
-
+
ADJ
0.5V
Reference
Generator
GND
Reverse Voltage
Shutdown
Operation
The RTQ9091 is a low input voltage low dropout LDO that
can support the input voltage range from 1.4V to 6V and
the output current can be up to 2A. The RTQ9091 uses
internal charge pump to achieve low input voltage operation
and the internal compensation network is well designed
to achieve fast transient response with good stability. In
steady-state operation, the feedback voltage is regulated
to the reference voltage by the internal regulator. When
the feedback voltage signal is less than the reference, the
on resistance of the power MOSFET is decreased
to
increase the output current through the power MOSFET,
and the feedback voltage will be charge back to reference.
If the feedback voltage is less than the reference, the power
MOSFET current is decreased to make the output voltage
discharge back to reference by the loading current.
Reverse Current Protection
The reverse current protection is guarantee by the N-
MOSFET with bulk capacitors connected to GND and the
internal circuit. The reverse voltage detection circuit shuts
the total loop down if the output voltage is higher than
input voltage.
Output Under-Voltage Protection (UVP) and Over-
Current Fold-Back
When the feedback voltage is lower than 0.15V after
internal soft-start end, the UVP is triggered. If the over
current condition is trigged during UVP state, the OC limit
current will be decreased to limit the output power and
change into re-soft-start state at the same time.
Soft-Start
An internal current source charges an internal capacitor
to build the soft-start ramp voltage. During the soft-start
state, the output current will be limited to prevent the inrush
current.
Over-Temperature Protection (OTP)
When the device triggers the OTP, the device shuts down
until the temperature back to normal and move to re-soft-
start state.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DSQ9091-00
November 2019
www.richtek.com
3
RTQ9091
Absolute Maximum Ratings
(Note 1)
0.3V to 7V
0.3V to 7V
2.500W
40°C/W
8°C/W
Supply Voltage, VIN ------------------------------------------------------------------------------------------------------
Other Pins -------------------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) ---------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad),
θ
JA
----------------------------------------------------------------------------------------------
SOP-8 (Exposed Pad),
θ
JC
---------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 4)
Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 1.4V to 6V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 125°C
Electrical Characteristics
(V
IN
= 1.4V to 6V, I
OUT
= 10μA to 2A, V
ADJ
= V
OUT
,
−40°C ≤
T
J
≤
85°C, unless otherwise specified)
Parameter
Quiescent Current
Shutdown Current
Line Regulation
Load Regulation
I
Q
Symbol
Test Conditions
V
IN
= 3.3V, I
OUT
= 0A
V
IN
= 6V, V
EN
= 0V
I
OUT
= 10mA
I
OUT
= 10mA to 2A
I
OUT
= 1A, V
IN
1.6V
I
OUT
= 1A, 1.4V < V
IN
< 1.6V
I
OUT
= 1.5A, V
IN
1.6V
I
OUT
= 1.5A, 1.4V < V
IN
< 1.6V
I
OUT
= 2A, V
IN
1.6V
I
OUT
= 2A, 1.4V < V
IN
< 1.6V
Min
--
--
--
--
--
--
--
--
--
--
2.3
Typ
0.7
1.5
0.2
0.5
120
--
180
--
240
--
3
Max
1.5
10
0.4
1.5
200
400
300
500
400
600
4.4
Unit
mA
A
%/V
%
I
SHDN
V
LINE
V
LOAD
Dropout Voltage
V
DROP
mV
Current Limit
Feedback
I
LIM
V
IN
= 3.3V
V
IN
= 3.3V, V
ADJ
= V
OUT
,
I
OUT
= 10mA, T
A
= 25C
V
IN
= 3.3V, V
ADJ
= V
OUT
,
I
OUT
= 10mA
V
ADJ
= 0.5V
A
0.495
0.4925
--
--
--
20
0.505
V
0.5075
200
nA
ADJ Reference Voltage
V
REF
ADJ Pin Current
I
ADJ
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DSQ9091-00
November 2019
RTQ9091
Parameter
Enable
EN Pin Current
EN Threshold
Voltage
Logic-High
Logic-Low
I
EN
V
IH
V
IL
V
EN
= 0V, V
IN
= 6V
V
IN
= 3.3V
V
IN
= 3.3V
--
1.6
--
1
--
--
10
--
0.4
A
V
Symbol
Test Conditions
Min
Typ
Max
Unit
Over-Temperature Protection
OTP Trip Level
Hysteresis
--
--
160
30
--
--
°C
°C
Note 1.
Stresses beyond those listed under
“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 in the natural convection (air flow = 0 ft/min) at T
A
= 25°C on a highly thermal conductive four-layer test
board of JEDEC 51-7 thermal measurement standard. The test board size is 75.6mm x 114.3mm (3"x4.5") with 1.6mm
thickness FR4 refer to JEDEC 51 standard. The test board exist four-layer copper, 2oz. (0.07mm) thickness. The case
point of
θ
JC
is on the expose pad for SOP-8 (Exposed Pad) package. The copper area of top copper plane is about
100mm
2
.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DSQ9091-00
November 2019
www.richtek.com
5
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