RT9185 RICHTEK [Richtek Technology Corporation], RT9185 Datasheet

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RT9185

Manufacturer Part Number
RT9185
Description
Triple, Ultra-Fast CMOS LDO Regulator
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
RT9185CM
Manufacturer:
RICHTEK
Quantity:
125
Triple, Ultra-Fast CMOS LDO Regulator
General Description
The RT9185 series are efficient, precise triple-channel
CMOS LDO regulators specifically designed for mother-
board application. The device is intended to powering the
standby voltage in which 3.3V_PCI, 2.5V_Clock and
1.8V_ICH2 or 1.5V_ICH4 core voltage of the PC based
computer system. Moreover, it is also optimized for CD/
DVD-ROM, CD/RW, XDSL Router or IA equipments
applications. The regulator outputs are capable of sourcing
1.5A, 0.8A and 0.3A of output current respectively.
The RT9185 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications. The other features include faster transient
response, low dropout voltage, high output accuracy,
current limiting and thermal shutdown protections.
The RT9185 regulators are available in fused SOP-8,
5-lead TO-252 and 5-lead TO-263 packages.
Ordering Information
Note :
RichTek Pb-free and Green products are :
DS9185-11 March 2007
RT9185
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
ments of IPC/JEDEC J-STD-020.
Package Type
S : SOP-8
L5 : TO-252-5
M5 : TO-263-5
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
VOUT3
A : 1.8V
B : 1.5V
Other voltage versions please
contact RichTek for detail.
cial Standard)
Features
Applications
Pin Configurations
Fixed Output Voltages : 3.35V at 1.5A, 2.55V at 0.8A
and 1.5V or 1.8V at 0.3A
Low Quiescent Current (Typically 0.4mA)
Operating Voltage Ranges : 3.5V to 5.5V
Ultra-Fast Transient Response
Tight Load and Line Regulation
Current Limiting Protection
Thermal Shutdown Protection
Only Low-ESR Ceramic Capacitors Required for
Stability
Custom Voltage Available
RoHS Compliant and 100% Lead (Pb)-Free
Mother-board Power Supply
CD/DVD-ROM, CD/RW
XDSL Router
IA Equipments
Cable Modems
VOUT1
VOUT2
VOUT3
VDD
(TOP VIEW)
2
3
4
TO-252-5
TO-263-5
SOP-8
5
4
3
2
5
4
3
2
8
7
6
5
GND
GND
GND
GND
VOUT3
VOUT2
GND (TAB)
VDD
VOUT1
VOUT3
VOUT2
GND (TAB)
VDD
VOUT1
RT9185
www.richtek.com
1

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RT9185 Summary of contents

Page 1

... DVD-ROM, CD/RW, XDSL Router or IA equipments applications. The regulator outputs are capable of sourcing 1.5A, 0.8A and 0.3A of output current respectively. The RT9185 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications. The other features include faster transient response, low dropout voltage, high output accuracy, current limiting and thermal shutdown protections ...

Page 2

... Functional Pin Description Pin Name Pin Function VOUT1 Channel 1 Output Voltage VDD Supply Input GND Common Ground VOUT2 Channel 2 Output Voltage VOUT3 Channel 3 Output Voltage www.richtek.com 2 VOUT1 VOUT3 C2 4.7uF RT9185 VDD VOUT2 GND C1 2.2uF Thermal Sensor - + Amplifier Reference Current Limiting + - - - + ...

Page 3

... LOAD3 OUT3 OUT3 − − Min Typ 3.315 3.35 2.525 2.55 1.782 1.8 1.485 1.5 1.5 1.9 0.8 1.3 0.3 0.5 -- 0.4 -- 600 -- 700 -- 2 <1. <0. < 0. 125 165 RT9185 65°C to 150°C 40°C to 125°C Max Units 3.415 2.60 V 1.836 1.530 -- -- A -- 0.8 mA 1085 PPM °C -- www.richtek.com 3 ...

Page 4

... RT9185 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 ...

Page 5

... OUT2 V = 1.8V/1.5V OUT3 105 125 (°C) V OUT1 V OUT2 V OUT3 105 125 (° 3.35V OUT1 105 125 RT9185 Quiescient Current 600 500 400 300 200 -40 -35 - Temperature (°C) PSRR - 2.2uF 4.7uF 4.7uF, C ...

Page 6

... RT9185 Load Transient Response 3.35V DD OUT1 100 C = 2.2uF 4.7uF -50 ≈ Time (500μs/Div) Load Transient Response 1.5V DD OUT3 100 C = 2.2uF 1uF -50 ≈ 400 200 0 Time (500μs/Div) Line Transient Response V = 4. ...

Page 7

... DS9185-11 March 2007 T = 125° 25°C A SOP 25° 50° TO-263-5 5.5 6.5 7.5 8.5 Power Dissipation vs. Copper Area 500 400 300 200 100 T = 65° 50° 25° 2.5 3 3.5 Power Dissipation (W) RT9185 T = 125°C J TO-252 4 4.5 5 www.richtek.com 7 ...

Page 8

... Output Capacitor The RT9185 is designed specifically to work with very small ceramic output capacitors. The recommended minimum capacitance (temperature characteristics X7R, X5R, Z5U, or Y5V) are 2.2μF to 4.7μF range with 10mΩ to 50mΩ ...

Page 9

... Thermal Considerations The RT9185 is a triple channel CMOS regulator designed to provide two output voltage from one package. Each output pin the RT9185 can deliver a current 1.5A, 0.8A and 0.3A respectively over the full operating junction temperature range. However, the maximum output current must be derated at higher ambient temperature to ensure the junction temperature does not exceed 125° ...

Page 10

... TRACE RESISTANCE RT9185 VOUT1 VDD VOUT3 VOUT2 DROP = I GND GND PLANE The GND pin of the RT9185 performs the dual function of providing an electrical connection to ground and channeling heat away. Connect the GND pin to ground using a large pad or ground plane. www.richtek.com ...

Page 11

... GND + V OUT1 + GND V DD SOP-8 Board Layout GND + V OUT1 + GND V DD TO-252-5/TO-263-5 Board Layout DS9185-11 March 2007 + V OUT3 + GND V OUT2 + V OUT3 + GND V OUT2 RT9185 www.richtek.com 11 ...

Page 12

... RT9185 Outline Dimension Symbol www.richtek.com Dimensions In Millimeters Min Max 4.801 5.004 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1.346 0.170 0.254 0.050 0.254 5.791 6.200 0.400 1.270 8-Lead SOP Plastic Package H M Dimensions In Inches ...

Page 13

... Ref. 0.889 2.032 1.270 Ref. 5.200 Ref. 0.200 1.500 2.500 3.400 0.500 0.850 5-Lead TO-252 Surface Mount Package RT9185 Dimensions In Inches Min Max 0.086 0.094 0.015 0.035 0.195 0.215 0.018 0.035 0.210 0.245 ...

Page 14

... RT9185 Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com Dimensions In Millimeters Min Max 4.064 4.826 1.143 1.676 0.660 0.914 0.305 0.584 1 ...

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