RT9008
Low Dropout Linear Regulator Controller with Soft-Start
General Description
The RT9008 is a wide input range, low dropout voltage
regulator controller with soft-start function. The part drives
an external N-MOSFET and can operate with VCC power
range from 4.5V to 13.5V. With this flexible topology and
wide input voltage range, the RT9008 is suitable for various
applications. The soft-start function can reduce the input
inrush current by adjusting the external capacitor. The
RT9008 uses the small footprint package of the SOT-23-6.
Features
Programmable Output Voltage
High Current Driver for High Current FET
Adjustable Soft Start Time
High Accuracy
±
2% Reference Voltage
Quick Line and Load Transient Response
Enable Control
Small Footprint Package SOT-23-6
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9008
Package Type
E : SOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
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.
Applications
Desktop/Notebook PC
DSC
Processor Power Sequencing
Pin Configurations
(TOP VIEW)
VCC DRI SS
6
5
4
2
3
EN GND FB
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
SOT-23-6
Typical Application Circuit
V
CC
RT9008
SS 4
6 VCC
C
CC
Chip Enable
DRI 5
1 EN
2 GND
FB 3
R2
V
IN
C
SS
Q1
C
IN
V
OUT
R1
C
OUT
V
OUT
= V
REF
x (
R1 + R2
)
R2
DS9008-01 April 2011
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1
RT9008
Test Circuit
V
CC
RT9008
SS 4
6 VCC
C
CC
1µF/X7R
Chip Enable
1 EN
2 GND
FB 3
DRI 5
C
SS
100pF/
Ceramic
Q1
PHD3055
R1
1k
R2
2k
C
OUT
100µF/EC
V
IN
C
IN
100µF/EC
V
OUT
Figure 1. Typical Test Circuit
V
CC
12V
RT9008
6 VCC
SS 4
DRI 5
1 EN
2 GND
FB 3
C
FB
C
CC
1µF
Chip Enable
5V
A
V
DRI
V
FB
Figure 2. DRI Source/Sink Current Test Circuit
Functional Pin Description
Pin No.
1
2
3
4
5
6
Pin Name
EN
GND
FB
SS
DRI
VCC
Enable Input Pin. (Active High)
Ground.
Output Voltage Feedback Reference Input.
Soft Start Control.
Driver Output.
Power Supply Input.
Pin Function
Function Block Diagram
EN
Shutdown
Logic
VCC
0.8V
Reference
+
-
DRI
SS
FB
GND
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DS9008-01 April 2011
RT9008
Absolute Maximum Ratings
(Note 1)
15V
7V
0.4W
250°C/W
260°C
Supply Input Voltage, V
CC
-----------------------------------------------------------------------------------------------
Enable
Voltage
-------------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-6 --------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
SOT-23-6,
θ
JA
---------------------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------
Junction Temperature Range -------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage, V
CC
----------------------------------------------------------------------------------------------
4.5V to 13.5V
Enable
Voltage
------------------------------------------------------------------------------------------------------------ 0V to 5.5V
Junction Temperature Range
-------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
CC
= 12V, T
A
= 25°C, unless otherwise specified).
Parameter
POR Threshold Voltage
POR Hysteresis
V
CC
Quiescent Current
Driver Source Current
Driver Sink Current
Feedback Reference Voltage
Reference Line Regulation
Amplifier Voltage Gain
PSRR at 100Hz, No Load
Chip Enable
EN
Threshold
Logic-High Voltage
Logic-Low Voltage
Symbol
V
CC_POR
V
CC_PORHY
I
Q
I
DRI_SR
I
DRI_SK
V
REF
V
REF_Line
Test Condition
V
CC
Rising
Min
4.0
--
Typ
4.2
0.2
0.3
--
--
0.8
3
70
--
--
--
--
Max
4.5
--
0.8
--
--
0.816
6
Unit
V
V
mA
mA
mA
V
mV
dB
dB
V
CC
= 12V
V
CC
= 12V, V
DRI
= 6V
V
CC
= 12V, V
DRI
= 6V
V
CC
= 12V, V
DRI
= 5V
V
CC
= 4.5V to 15V
V
CC
= 12V, No Load
--
5
5
0.784
--
--
50
1.4
0
PSRR
V
IH
V
IL
I
SHDN
I
SS
V
CC
= 12V, No Load
5.5
0.4
5
V
μA
μA
ms
Shutdown Current
Soft-Start
SS pin Source Current
Output Turn-On Rise Time
V
CC
= 12V, V
EN
= 0V
V
SS
= 0V
V
OUT
= 1.2V, C
OUT
= 1000μF,
C
SS
= 4.7nF
--
2
--
5
1
10
--
DS9008-01 April 2011
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3
RT9008
Note 1.
Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. 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 for extended
periods may remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at
T
A
= 25°C
on a low effective thermal conductivity single layer test board of
JEDEC 51-3 thermal measurement standard.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
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DS9008-01 April 2011
RT9008
Typical Operating Characteristics
Quiescent Current vs. Temperature
0.60
0.50
1.00
0.95
Feedback Voltage vs. Temperature
Quiescent Current (mA)
Feedback Voltage (V)
V
IN
= 1.5V, V
CC
= 12V
0.90
0.85
0.80
0.75
0.70
0.65
0.40
0.30
0.20
0.10
0.00
-50
-25
0
25
50
75
100
125
V
IN
= 1.5V, V
CC
= 12V
0.60
-50
-25
0
25
50
75
100
125
Temperature
(°C)
Temperature
(°C)
DRI Source Current vs. Temperature
60
DRI Sink Current vs. Temperature
30
27
24
21
18
15
DRI Source Current (mA)
50
45
40
DRI Sink Current (mA)
V
FB
= 0.6V, V
CC
= 12V, V
DRI
= 6V
-50
-25
0
25
50
75
100
125
55
V
FB
= 1V, V
CC
= 12V, V
DRI
= 6V
12
-50
-25
0
25
50
75
100
125
35
Temperature
(°C)
Temperature
(°C)
Sink Current vs. DRI Voltage
25
Source Current vs. DRI Voltage
50
15
Source Current (mA)
20
Refer to Test Circuit Figure 2
40
Sink Current (mA)
30
10
20
5
10
V
FB
= 1V, V
CC
= 12V
0
0
0.5
1
1.5
2
2.5
3
V
FB
= 0.6V, V
CC
= 12V
0
0
2
4
6
8
10
12
DRI Voltage (V)
DRI Voltage (V)
DS9008-01 April 2011
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5
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