®
RT9048
2A, Low Input Voltage, Ultra-Low Dropout Linear Regulator
with Enable
General Description
The RT9048 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 2A. The
feature of ultra-low dropout voltage is ideal for the
application where output voltage is very close to input
voltage. The input voltage can be as low as 1.4V and the
output voltage is adjustable by an external resistive divider
as low as 0.5V. The RT9048 provides an excellent output
voltage regulation over variations in line, load and
temperature. Over Current and over temperature protection
functions are provided. Additionally, an enable pin is
designed to further reduce power consumption while
shutdown and the shutdown current is as low as 1.5μA.
The RT9048 is available in the SOP-8 (Exposed Pad)
package.
Features
Input Voltage as Low as 1.4V
Ultra-Low Dropout Voltage 400mV @ 2A
Over Current Protection
Over Temperature Protection
1.5μA 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
RT9048
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
GND
ADJ
VOUT
NC
GND
9
7
6
5
SOP-8 (Exposed Pad)
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Marking Information
RT9048GSP : Product Number
½
Suitable for use in SnPb or Pb-free soldering processes.
RT9048
GSPYMDNN
YMDNN : Date Code
Simplified Application Circuit
V
IN
C1
Enable
EN
GND
ADJ
R2
VIN
RT9048
VOUT
R1
C2
V
OUT
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9048-02 March 2015
www.richtek.com
1
RT9048
Functional Pin Description
Pin No.
1, 4, 5
2
Pin Name
NC
EN
Pin Function
No Internal Connection.
Enable Control Input (Active-High). Pulling this pin below 0.4V turns the regulator
off, reducing the quiescent current to a fraction of its operating value. The device
will be enabled if this pin is left open. Connect to VIN if not being used.
Supply Voltage Input. For regulation at full load, the input to this pin must be
between (V
OUT
+ 0.5V) and 6V. The 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. Also, a minimum of 10F ceramic capacitor should be
placed directly at this pin.
Output Voltage. 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
Operation
The RT9048 is a low dropout voltage linear regulator
designed specially for low external components system.
Output Transistor
The RT9048 builds in a N-MOSFET output transistor which
provides a low switch-on resistance for low dropout voltage
applications.
Error Amplifier
The Error Amplifier compares the internal reference voltage
with the output feedback voltage, and controls the Gate
voltage of N-MOSFET to support good line regulation and
load regulation at output voltage.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
Current Limit Protection
The RT9048 provides current limit function to prevent the
device from damages during over-load or shorted-circuit
condition. This current is detected by an internal sensing
resistor.
Over Temperature Protection
The over temperature protection function will turn off the
P-MOSFET when the junction temperature exceeds
160°C (typ.). Once the junction temperature cools down
by approximately 30°C, the regulator will automatically
resume operation.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9048-02 March 2015
RT9048
Absolute Maximum Ratings
(Note 1)
−0.3V
to 7V
−0.3V
to 6V
2.04W
49°C/W
15°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
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= 1.4V to 6V, I
OUT
= 10μA to 2A, V
ADJ
= V
OUT
, T
A
= 25°C, unless otherwise specified)
Parameter
Quiescent Current
Shutdown Current
Output Voltage
Line Regulation
Load Regulation
Symbol
I
Q
I
SHDN
V
OUT
V
LINE
V
LOAD
Test Conditions
V
IN
= 3.3V, I
OUT
= 0A
V
IN
= 6V, V
EN
= 0V
V
IN
= V
OUT
+ 0.5V, I
OUT
= 10mA
V
IN
= 1.8V, I
OUT
= 0.8A
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
--
--
--
--
--
--
--
--
--
Typ
0.7
1.5
--
0.2
0.5
120
--
180
--
240
--
3
Max
--
10
2
--
--
200
400
300
500
400
600
--
Unit
mA
A
%
%/V
%
Dropout Voltage
V
DROP
mV
Current Limit
Feedback
ADJ Reference Voltage
ADJ Pin Current
I
LIM
V
ADJ
I
ADJ
V
IN
= 3.3V
V
IN
= 3.3V, V
ADJ
= V
OUT
, I
OUT
= 10mA
V
ADJ
= 0.5V
A
0.495
--
--
20
0.505
200
V
nA
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9048-02 March 2015
www.richtek.com
3
RT9048
Parameter
Enable
EN Pin Current
EN Input 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
“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.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9048-02 March 2015
RT9048
Typical Application Circuit
RT9048
V
IN
C1
10µF
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
Figure 1. Adjustable Voltage Regulator
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9048-02 March 2015
www.richtek.com
5
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