Voltage Regulator. RT9059A Datasheet

RT9059A Regulator. Datasheet pdf. Equivalent

RT9059A Datasheet
Recommendation RT9059A Datasheet
Part RT9059A
Description Ultra-Low Dropout Voltage Regulator
Feature RT9059A; ® RT9059A 3A, Ultra-Low Dropout Voltage Regulator General Description The RT9059A is a high perfor.
Manufacture Richtek
Datasheet
Download RT9059A Datasheet




Richtek RT9059A
®
RT9059A
3A, Ultra-Low Dropout Voltage Regulator
General Description
The RT9059A is a high performance positive voltage
regulator designed for use in applications requiring very
low input voltage and very low dropout voltage at up to 3A.
It operates with a VIN as low as 1V and VDD voltage 3V
with programmable output voltage as low as 0.8V. The
RT9059A features ultra-low dropout, ideal for applications
where VOUT is very close to VIN. Additionally, it has an
enable pin to further reduce power dissipation while
shutdown. The RT9059A provides excellent regulation over
variations in line, load and temperature. The RT9059A
provides a power good signal to indicate if the voltage
level of VO reaches 90% of its rating value.
Ordering Information
RT9059A
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
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.
Features
Output Current up to 3A
High Accuracy ADJ Voltage 1.5%
Dropout Voltage 350mV @ 3A Typically
VOUT Power Good Signal
VOUT Pull Low Resistance when Disable
Current Limit Protection
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
Applications
Notebook PC Applications
Motherboard Applications
Marking Information
4S= : Product Code
4S=YM
DNN
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
VOUT 1
VOUT 2
VOUT 3
ADJ 4
PGOOD 5
10 VDD
9 VIN
8 VIN
7 VIN
11 6 EN
WDFN-10L 3x3
Simplified Application Circuit
Enable
RT9059A
EN PGOOD
VDD
CVDD
VOUT
VIN ADJ
CIN GND
RPGOOD
R1 COUT
R2
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9059A-01 October 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9059A
RT9059A
Functional Pin Description
Pin No.
Pin Name
Pin Function
1, 2, 3
VOUT
Output Voltage.
4
ADJ
Output Voltage Setting.
VOUT = VREF x (R1 + R2) / R2.
5
PGOOD
Power Good Open-Drain Output.
6 EN
Enable Control Input.
7, 8. 9
VIN
Supply Voltage Input.
10
VDD
Supply Voltage of Control Circuit.
11
(Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Function Block Diagram
EN VDD
VREF
EN UVLO OCP
VIN
RSENSE
ADJ
+
EA
-
MOS
Driver
VOUT
Thermal
Protection
Soft-Start
+
-
PGOOD
Comparator
DELAY
150
PGOOD
GND
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9059A-01 October 2013



Richtek RT9059A
Operation
The RT9059A is a high performance positive voltage
regulator designed for use in very low input voltage and
very low dropout voltage with high output current up to
3A.
Output Transistor
The RT9059A includes a built-in low dropout N-MOSFET
output transistor for low input voltage and high output
current applications.
Error Amplifier
The Error Amplifier compares output feedback voltage from
an internal feedback voltage divider or from ADJ pin to an
internal reference voltage and controls the N-MOSFET gate
voltage to maintain output voltage regulation.
RT9059A
Soft-Start
The RT9059A provides soft-start function to prevent large
in-rush current during power on period.
Current Limit and Over-Temperature Protection
The RT9059A provides a current limit function to prevent
damage during output over-load or short-circuit conditions.
The output current is detected by an internal sensing
transistor.
The RT9059A also equips Over-Temperature Protection
(OTP) function. When the internal junction temperature
exceeds 160°C, OTP function will turn off the N-MOSFET.
Once the junction temperature cools down below 90°C,
the RT9059A will resume operation automatically.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9059A-01 October 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)