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RT9048GSP

P1-P3P4-P6P7-P9P10-P10
RT9048
®
DS9048-02 March 2015 www.richtek.com
1
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
Ordering Information
Note :
Richtek products are :
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.
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
1.5
μμ
μμ
μA Input Current in Shutdown Mode
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
RT9048
Lead Plating System
G : Green (Halogen Free and Pb Free)
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Simplified Application Circuit
Pin Configurations
(TOP VIEW)
SOP-8 (Exposed Pad)
NC
EN
VIN
NC
GND
ADJ
NC
VOUT
GND
2
3
4
5
6
7
8
9
Marking Information
RT9048GSP : Product Number
YMDNN : Date Code
RT9048
GSPYMDNN
EN
ADJ
VOUT
RT9048
GND
VIN
V
IN
V
OUT
C2
R1
R2
C1
Enable
RT9048
2
DS9048-02 March 2015www.richtek.com
©
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Function Block Diagram
Pin No. Pin Name Pin Function
1, 4, 5 NC No Internal Connection.
2 EN
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.
3 VIN
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.
6 VOUT Output Voltage. A minimum of 10F capacitor should be placed directly at this pin.
7 ADJ
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.
8,
9 (Exposed pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to GND
for maximum power dissipation.
+
-
Reference
Generator
0.5V
Thermal
Shutdown
0.5µA
V
IN
V
PUMP
-
+
R
SENSE
EN
VIN
GND
ADJ
VOUT
V
IN
+
-
V
IN
V
OUT
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.
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.
RT9048
3
DS9048-02 March 2015 www.richtek.com
©
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Absolute Maximum Ratings (Note 1)
Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ −0.3V to 7V
Other Pins------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------------- 2.04W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θ
JA
---------------------------------------------------------------------------------------------- 49°C/W
SOP-8 (Exposed Pad), θ
JC
--------------------------------------------------------------------------------------------- 15°C/W
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 Symbol Test Conditions Min Typ Max Unit
Quiescent Current I
Q
V
IN
= 3.3V, I
OUT
= 0A -- 0.7 -- mA
Shutdown Current I
SHDN
V
IN
= 6V, V
EN
= 0V -- 1.5 10 A
V
IN
= V
OUT
+ 0.5V, I
OUT
= 10mA
Output Voltage V
OUT
V
IN
= 1.8V, I
OUT
= 0.8A
2 -- 2 %
Line Regulation V
LINE
I
OUT
= 10mA -- 0.2 -- %/V
Load Regulation V
LOAD
I
OUT
= 10mA to 2A -- 0.5 -- %
I
OUT
= 1A, V
IN
1.6V -- 120 200
I
OUT
= 1A, 1.4V < V
IN
< 1.6V -- -- 400
I
OUT
= 1.5A, V
IN
1.6V -- 180 300
I
OUT
= 1.5A, 1.4V < V
IN
< 1.6V -- -- 500
I
OUT
= 2A, V
IN
1.6V -- 240 400
Dropout Voltage V
DROP
I
OUT
= 2A, 1.4V < V
IN
< 1.6V -- -- 600
mV
Current Limit I
LIM
V
IN
= 3.3V -- 3 -- A
Feedback
ADJ Reference Voltage V
ADJ
V
IN
= 3.3V, V
ADJ
= V
OUT
, I
OUT
= 10mA 0.495 -- 0.505 V
ADJ Pin Current I
ADJ
V
ADJ
= 0.5V -- 20 200 nA
P1-P3P4-P6P7-P9P10-P10

RT9048GSP

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IC REG LINEAR POS ADJ 2A 8SOP
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