RT9025
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Recommended Operating Conditions (Note 3)
z Supply Input Voltage, VIN -------------------------------------------------------------------------------------------- 1.4V to 5V z Control Voltage, VDD -------------------------------------------------------------------------------------------------- 10µF
Chip Enable VDD
EN
ADJ
VDD PGOOD
R2
GND
100k
1µF
VOUT
Figure 2. Adjustable Voltage Regulator
Functional Pin Description
Pin No.
Pin Name
Pin Function
Applications
z Note Book PC Applications z Motherboard Applications
Pin Configurations
(TOP VIEW)
Ordering Information
RT9025-
Package Type S : SOP-8 SP : SOP-8 (Exposed Pad-Option 1)
8, GND
9 (Exposed Pad)
Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.
Function Block Diagram
6
VOUT
Output Voltage.
Set the output voltage by the internal feedback resistors when ADJ is grounded.
7
ADJ
If external feedback resistors is used, VOUT = 0.8V x (R2+R1)/R2.
VIN
EN VDD
OCP OTP
Error Amplifier
+ -
POR 0.8V 0.72V
Mode
+
VOUT SD
ADJ PGOOD GND
2
DS9025-02 May 2009
RT9025
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, VIN -------------------------------------------------------------------------------------------- 6V z Control Voltage --------------------------------------------------------------------------------------------------------- 6V z Output Voltage --------------------------------------------------------------------------------------------------------- 6V z Power Dissipation, PD @ TA = 25°C
RT9025
2A, Ultra Low Dropout LDO
General Description
The RT9025 is a high performance positive voltage regulator designed for use in applications requiring very low Input voltage and extremely low dropout voltage at up to 2A(Peak). It operates with a VIN as low as 1V and VDD voltage 3V with programmable output voltage as low as 0.8V. The RT9025 features ultra low dropout that is ideal for applications where VOUT is very close to VIN. Additionally, it has an enable pin to further reduce power dissipation while shutdown and provides excellent regulation over variations in line, load and temperature. The RT9025 provides a power good signal to indicate if the voltage level of Vo reaches 90% of its rating value. The RT9025 is available in the SOP-8 and SOP-8 (Exposed Pad) package with 1.05V, 1.2V, 1.5V, 1.8V and 2.5V internally preset outputs that are also adjustable by using external resistors.
Features
z Ultra Low Dropout Voltage 230mV at 2A z Output Current up to 2A z High Accuracy Output Voltage 2% z Power Good Output z Output Voltage Pull Low Resistor when Disable z Over Current Protection z Thermal Shutdown Protection z RoHS Compliant and 100% Lead (Pb)-Free
Note :
Richtek Pb-free and Green 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.
PGOOD EN VIN
VDD
8
2
7
3
6
4
5
SOP-8
GND ADJ VOUT NC
PGOOD EN VIN
VDD
8
2
7
GND
3
96
4
5
GND ADJ VOUT NC
SOP-8 (Exposed Pad)
DS9025-02 May 2009
1
RT9025
Typical Application Circuit
SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.833W SOP-8 (Exposed Pad) ----------------------------------------------------------------------------------------------- 1.333W z Package Thermal Resistance (Note 4) SOP-8, θJA -------------------------------------------------------------------------------------------------------------- 120°C/W SOP-8, θJC -------------------------------------------------------------------------------------------------------------- 60°C/W SOP-8 (Exposed Pad), θJA ------------------------------------------------------------------------------------------ 75°C/W SOP-8 (Exposed Pad), θJC ----------------------------------------------------------------------------------------- 15°C/W z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C z Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
VIN
VIN
VOUT
CIN
10µF
RT9025
Chip Enable VDD
EN
ADJ
VDD PGOOD
GND
1µF
100k
VOUT
Figure 1. Fixed Voltage Regulator
VOUT COUT 10µF
VOUT
=
0.8 ×
R1+ R2 R2
VIN
VIN
VOUT
VOUT
CIN 10µF
1
PGOOD Power Good Open Drain Output.
2
EN
Chip Enable (Active High).
3
VIN
Supply Input Voltage.
4
VDD
Supply Voltage of Control Circuit.
5
NC
No Internal Connection.
Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage 1K : 1.05V/Adj 12 : 1.2V/Adj 15 : 1.5V/Adj 18 : 1.8V/Adj 25 : 2.5V/Adj
z Supply Input Voltage, VIN -------------------------------------------------------------------------------------------- 1.4V to 5V z Control Voltage, VDD -------------------------------------------------------------------------------------------------- 10µF
Chip Enable VDD
EN
ADJ
VDD PGOOD
R2
GND
100k
1µF
VOUT
Figure 2. Adjustable Voltage Regulator
Functional Pin Description
Pin No.
Pin Name
Pin Function
Applications
z Note Book PC Applications z Motherboard Applications
Pin Configurations
(TOP VIEW)
Ordering Information
RT9025-
Package Type S : SOP-8 SP : SOP-8 (Exposed Pad-Option 1)
8, GND
9 (Exposed Pad)
Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.
Function Block Diagram
6
VOUT
Output Voltage.
Set the output voltage by the internal feedback resistors when ADJ is grounded.
7
ADJ
If external feedback resistors is used, VOUT = 0.8V x (R2+R1)/R2.
VIN
EN VDD
OCP OTP
Error Amplifier
+ -
POR 0.8V 0.72V
Mode
+
VOUT SD
ADJ PGOOD GND
2
DS9025-02 May 2009
RT9025
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, VIN -------------------------------------------------------------------------------------------- 6V z Control Voltage --------------------------------------------------------------------------------------------------------- 6V z Output Voltage --------------------------------------------------------------------------------------------------------- 6V z Power Dissipation, PD @ TA = 25°C
RT9025
2A, Ultra Low Dropout LDO
General Description
The RT9025 is a high performance positive voltage regulator designed for use in applications requiring very low Input voltage and extremely low dropout voltage at up to 2A(Peak). It operates with a VIN as low as 1V and VDD voltage 3V with programmable output voltage as low as 0.8V. The RT9025 features ultra low dropout that is ideal for applications where VOUT is very close to VIN. Additionally, it has an enable pin to further reduce power dissipation while shutdown and provides excellent regulation over variations in line, load and temperature. The RT9025 provides a power good signal to indicate if the voltage level of Vo reaches 90% of its rating value. The RT9025 is available in the SOP-8 and SOP-8 (Exposed Pad) package with 1.05V, 1.2V, 1.5V, 1.8V and 2.5V internally preset outputs that are also adjustable by using external resistors.
Features
z Ultra Low Dropout Voltage 230mV at 2A z Output Current up to 2A z High Accuracy Output Voltage 2% z Power Good Output z Output Voltage Pull Low Resistor when Disable z Over Current Protection z Thermal Shutdown Protection z RoHS Compliant and 100% Lead (Pb)-Free
Note :
Richtek Pb-free and Green 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.
PGOOD EN VIN
VDD
8
2
7
3
6
4
5
SOP-8
GND ADJ VOUT NC
PGOOD EN VIN
VDD
8
2
7
GND
3
96
4
5
GND ADJ VOUT NC
SOP-8 (Exposed Pad)
DS9025-02 May 2009
1
RT9025
Typical Application Circuit
SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.833W SOP-8 (Exposed Pad) ----------------------------------------------------------------------------------------------- 1.333W z Package Thermal Resistance (Note 4) SOP-8, θJA -------------------------------------------------------------------------------------------------------------- 120°C/W SOP-8, θJC -------------------------------------------------------------------------------------------------------------- 60°C/W SOP-8 (Exposed Pad), θJA ------------------------------------------------------------------------------------------ 75°C/W SOP-8 (Exposed Pad), θJC ----------------------------------------------------------------------------------------- 15°C/W z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C z Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
VIN
VIN
VOUT
CIN
10µF
RT9025
Chip Enable VDD
EN
ADJ
VDD PGOOD
GND
1µF
100k
VOUT
Figure 1. Fixed Voltage Regulator
VOUT COUT 10µF
VOUT
=
0.8 ×
R1+ R2 R2
VIN
VIN
VOUT
VOUT
CIN 10µF
1
PGOOD Power Good Open Drain Output.
2
EN
Chip Enable (Active High).
3
VIN
Supply Input Voltage.
4
VDD
Supply Voltage of Control Circuit.
5
NC
No Internal Connection.
Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage 1K : 1.05V/Adj 12 : 1.2V/Adj 15 : 1.5V/Adj 18 : 1.8V/Adj 25 : 2.5V/Adj