®
RT2516
2A, Low Input Voltage, Ultra-Low Dropout LDO Regulator
with Enable
General Description
The RT2516 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 RT2516
features ultra low dropout, ideal
for applications where
output voltage is very close to input voltage. Additionally,
the RT2516 has an enable pin to further reduce power
dissipation while shutdown. The RT2516 provides
excellent regulation over variations in line, load and
temperature. The RT2516 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 @ 2A
Over Current Protection
Over Temperature Protection
1μA Input Current in Shutdown Mode
μ
Enable Control
RoHS Compliant and Halogen Free
Applications
Telecom/Networking Cards
Motherboards/Peripheral Cards
Industrial Applications
Wireless Infrastructure
Set Top Box
Medical Equipment
Notebook Computers
Battery Powered Systems
Ordering Information
RT2516
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
½
Pin Configurations
(TOP VIEW)
NC
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
RT2516
V
IN
C1
Chip Enable
EN
GND
ADJ
R2
VIN
VOUT
R1
C2
V
OUT
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2516-03
November 2013
www.richtek.com
1
RT2516
Marking Information
RT2516GSP : Product Number
RT2516
GSPYMDNN
YMDNN : Date Code
Functional Pin Description
Pin No.
1, 4, 5
2
Pin Name
NC
EN
Pin Function
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)
Function Block Diagram
R
SENSE
VIN
V
PUMP
-
+
VOUT
-
+
ADJ
V
IN
0.5µA
EN
Thermal
Shutdown
V
OUT
V
IN
+
-
0.5V
V
IN
Reference
Generator
GND
Reverse Voltage
Shutdown
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS2516-03
November 2013
RT2516
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
CDM (Charged Device Model) ------------------------------------------------------------------------------------------ 1kV
(Note 4)
Recommended Operating Conditions
Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 1.4V to 6V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 105°C
Electrical Characteristics
(V
IN
= 1.4V to 6V, I
OUT
= 10μA to 2A, V
ADJ
= V
OUT
,
−40°C ≤
T
A
≤
105°C, unless otherwise specified)
Parameter
Quiescent Current
Shutdown Current
Line Regulation
Load Regulation
I
Q
Symbol
I
SHDN
V
LINE
V
LOAD
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
%
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
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2516-03
November 2013
www.richtek.com
3
RT2516
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
--
--
160
30
10
--
0.4
--
--
°C
°C
A
V
Symbol
Test Conditions
Min
Typ
Max
Unit
Over Temperature Protection
OTP Trip Level
Hysteresis
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 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
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS2516-03
November 2013
RT2516
Typical Application Circuit
RT2516
V
IN
C1
10µF
Chip Enable
2
ADJ 7
EN
R2
GND
8,
9 (Exposed Pad)
(V)
3
VIN
VOUT
6
R1
C2
10µF
V
OUT
V
OUT
=
0.5(R1+R2)
R2
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2516-03
November 2013
www.richtek.com
5
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