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RT9008GE

P1-P3P4-P6P7-P9
RT9008
1
DS9008-01 April 2011 www.richtek.com
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.
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
zz
zz
z
Programmable Output Voltage
zz
zz
z High Current Driver for High Current FET
zz
zz
z Adjustable Soft Start Time
zz
zz
z High Accuracy
±±
±±
±2% Reference Voltage
zz
zz
z Quick Line and Load Transient Response
zz
zz
z Enable Control
zz
zz
z Small Footprint Package SOT-23-6
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Desktop/Notebook PC
z DSC
z Processor Power Sequencing
(TOP VIEW)
SOT-23-6
Pin Configurations
Typical Application Circuit
EN GND
FB
VCC DRI SS
4
23
56
OUT REF
R1 + R2
V = V x ( )
R2
VCC
EN
SS
DRI
FB
GND
RT9008
R1
R2
C
OUT
V
IN
C
CC
C
SS
V
CC
C
IN
4
23
5
6
1
Chip Enable
V
OUT
Q1
RT9008
Package Type
E : SOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
RT9008
2
DS9008-01 April 2011www.richtek.com
Function Block Diagram
Functional Pin Description
Pin No. Pin Name Pin Function
1 EN Enable Input Pin. (Active High)
2 GND Ground.
3 FB Output Voltage Feedback Reference Input.
4 SS Soft Start Control.
5 DRI Driver Output.
6 VCC Power Supply Input.
+
-
Shutdown
Logic
0.8V
Reference
GND
FB
SS
DRI
VCC
EN
Test Circuit
VCC
EN
SS
DRI
FB
GND
RT9008
C
CC
V
CC
4
2
3
5
6
1
Chip Enable
1µF
C
FB
V
FB
A
V
DRI
5V
12V
Figure 1. Typical Test Circuit
Figure 2. DRI Source/Sink Current Test Circuit
VCC
EN
SS
DRI
FB
GND
RT9008
R1
R2
C
OUT
V
IN
C
CC
C
SS
V
CC
C
IN
4
23
5
6
1
Chip Enable
V
OUT
Q1
1µF/X7R
100µF/EC
100µF/EC
1k
2k
100pF/
Ceramic
PHD3055
RT9008
3
DS9008-01 April 2011 www.richtek.com
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, V
CC
----------------------------------------------------------------------------------------------- 15V
z Enable Voltage ------------------------------------------------------------------------------------------------------------- 7V
z Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-6 -------------------------------------------------------------------------------------------------------------------- 0.4W
z Package Thermal Resistance (Note 2)
SOT-23-6, θ
JA
--------------------------------------------------------------------------------------------------------------- 250°C/W
z Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------------- 260°C
z Junction Temperature Range-------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
z Supply Input Voltage, V
CC
---------------------------------------------------------------------------------------------- 4.5V to 13.5V
z Enable Voltage ------------------------------------------------------------------------------------------------------------ 0V to 5.5V
z Junction Temperature Range------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(V
CC
= 12V, T
A
= 25°C, unless otherwise specified).
Parameter Symbol Test Condition Min Typ Max Unit
POR Threshold Voltage V
CC_POR
V
CC
Rising 4.0 4.2 4.5 V
POR Hysteresis V
CC_PORHY
-- 0.2 -- V
V
CC
Quiescent Current I
Q
V
CC
= 12V -- 0.3 0.8 mA
Driver Source Current I
DRI_SR
V
CC
= 12V, V
DRI
= 6V 5 -- -- mA
Driver Sink Current I
DRI_SK
V
CC
= 12V, V
DRI
= 6V 5 -- -- mA
Feedback Reference Voltage V
REF
V
CC
= 12V, V
DRI
= 5V 0.784 0.8 0.816 V
Reference Line Regulation V
REF_Line
V
CC
= 4.5V to 15V -- 3 6 mV
Amplifier Voltage Gain V
CC
= 12V, No Load -- 70 dB
PSRR at 100Hz, No Load PSRR V
CC
= 12V, No Load 50 -- dB
Chip Enable
Logic-High Voltage V
IH
1.4 -- 5.5
EN
Threshold
Logic-Low Voltage V
IL
0 -- 0.4
V
Shutdown Current I
SHDN
V
CC
= 12V, V
EN
= 0V -- -- 5 μA
Soft-Start
SS pin Source Current I
SS
V
SS
= 0V 2 5 10 μA
Output Turn-On Rise Time
V
OUT
= 1.2V, C
OUT
= 1000μF,
C
SS
= 4.7nF
-- 1 -- ms
P1-P3P4-P6P7-P9

RT9008GE

Mfr. #:
Buy RT9008GE
Manufacturer:
Description:
IC LNR REG CTRLR SOT23-6
Lifecycle:
New from this manufacturer.
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