®
RT9059
3A, Ultra-Low Dropout Voltage Regulator
General Description
The RT9059 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 RT9059
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 RT9059 provides excellent regulation over variations
in line, load and temperature. The RT9059 provides a power
good signal to indicate if the voltage level of V
O
reaches
90% of its rating value.
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 Limiting Protection
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
Applications
Notebook PC Applications
Motherboard Applications
Ordering Information
RT9059(-
)
Package Type
SP: SOP-8 (Exposed Pad-Option 1)
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
None : Adjustable Output
Fixed Output Voltage Code
15 : 1.5V
18 : 1.8V
25 : 2.5V
Note :
Richtek products are :
½
Pin Configuration
(TOP VIEW)
PGOOD
EN
VIN
VDD
2
3
4
8
GND
ADJ/NC
VOUT
NC
GND
9
7
6
5
SOP-8 (Exposed Pad)
VOUT
VOUT
VOUT
ADJ/NC
PGOOD
GND
1
2
3
4
5
10
9
8
7
6
11
VDD
VIN
VIN
VIN
EN
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.
WDFN-10L 3x3
½
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9059-11 April 2018
www.richtek.com
1
RT9059
Typical Application Circuit
V
IN
1V to 5.5V
VDD
3V to 5.5V
C
IN
10µF
C
VDD
1µF
RT9059
VIN
PGOOD
R
PGOOD
VDD
VOUT
R1
ADJ
EN
GND
R2
C
OUT
10µF
V
OUT
VDD
3V to 5.5V
RT9059
V
IN
1V to 5.5V
C
IN
10µF
C
VDD
1µF
VIN
PGOOD
VDD
VOUT
EN
GND
C
OUT
10µF
R
PGOOD
V
OUT
Chip Enable
Chip Enable
V
OUT
= 0.8 x (R1+R2)/R2
Figure 1. Adjustable Voltage Regulator
Figure 2. Fixed Voltage Regulator
Functional Pin Description
Pin No.
SOP-8 (Exposed Pad)
Adjustable
Output Voltage
1
2
3
4
5
6
7
Fixed Output
Voltage
1
2
3
4
5, 7
6
--
WDFN-10L 3x3
Adjustable
Fixed Output
Output Voltage
Voltage
5
6
7, 8. 9
10
--
1, 2, 3
4
5
6
7, 8. 9
10
4
1, 2, 3
--
PGOOD Power good open drain output.
EN
VIN
VDD
NC
VOUT
ADJ
Enable control input.
Supply input voltage.
Supply voltage of control circuit.
No internal connection.
Output voltage.
Output voltage setting.
V
OUT
= V
REF
x (R1+R2)/R2.
Ground. The exposed pad must
be soldered to a large PCB and
connected to GND for maximum
power dissipation.
Pin Name
Pin Function
8,
8,
11
11
GND
9 (Exposed Pad) 9 (Exposed Pad) (Exposed Pad) (Exposed Pad)
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9059-11 April 2018
RT9059
Functional Block Diagram
EN
VDD
VIN
VOUT
VREF
EN
UVLO
OCP
R
SENSE
ADJ
+
EA
-
MOS
Driver
150
VOUT
Thermal
Protection
+
-
PGOOD
Comparator
Soft-Start
PGOOD
DELAY
GND
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9059-11 April 2018
www.richtek.com
3
RT9059
Absolute Maximum Ratings
(Note 1)
−0.3V
to 6V
−0.3V
to 7V
−0.3V
to 6V
−0.3V
to 7V
−0.3V
to 6V
Supply Input Voltage, VIN to GND
DC -----------------------------------------------------------------------------------------------------------------------------
< 10ms -----------------------------------------------------------------------------------------------------------------------
Control Voltage, VDD to GND
DC -----------------------------------------------------------------------------------------------------------------------------
< 10ms -----------------------------------------------------------------------------------------------------------------------
Output Voltage, VOUT ---------------------------------------------------------------------------------------------------
Chip Enable Voltage, EN ------------------------------------------------------------------------------------------------
−0.3V
to 6V
Adjust Voltage, ADJ ------------------------------------------------------------------------------------------------------
−0.3V
to 6V
Power Good Voltage, V
PGOOD
------------------------------------------------------------------------------------------
−0.3V
to 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------------- 3.08W
WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------------- 3.04W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad),
θ
JA
---------------------------------------------------------------------------------------------- 32.4°C/W
SOP-8 (Exposed Pad),
θ
JC
--------------------------------------------------------------------------------------------- 6.5°C/W
WDFN-10L 3x3,
θ
JA
-------------------------------------------------------------------------------------------------------
WDFN-10L 3x3,
θ
JC
-------------------------------------------------------------------------------------------------------
Junction Temperature -----------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------
Storage Temperature Range --------------------------------------------------------------------------------------------
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------
MM (Machine Model) -----------------------------------------------------------------------------------------------------
(Note 4)
1V to 5.5V
3V to 5.5V
−40°C
to 125°C
−40°C
to 85°C
32.8°C/W
5.9°C/W
150°C
260°C
−65°C
to 150°C
2kV
200V
Recommended Operating Conditions
Supply Input Voltage, VIN -----------------------------------------------------------------------------------------------
Control Voltage, VDD (V
DD
> V
OUT
+ 1.5V) --------------------------------------------------------------------------
Junction Temperature Range --------------------------------------------------------------------------------------------
Ambient Temperature Range --------------------------------------------------------------------------------------------
Electrical Characteristics
(V
DD
= 5V, C
IN
= C
OUT
= 10μF, C
VDD
= 1μF, T
A
= 25°C, unless otherwise specified)
Parameter
VDD Operation Range
VDD POR Threshold
VDD POR Falling Hysteresis
Input Voltage Range
VIN POR Threshold
VIN POR Falling Hysteresis
Quiescent Current
Symbol
V
DD
V
POR_VDD
V
POR_VDD
V
IN
V
POR_VIN
V
POR_VIN
I
Q
Test Conditions
Min
3
Typ
--
2.7
0.2
--
0. 8
0. 2
0.6
Max
5.5
3
--
5.5
0.9
0.25
1.2
Unit
V
V
V
V
V
V
mA
V
DD
rising
V
DD
falling
2.4
0.15
1
V
IN
rising
V
IN
falling
EN on, no load
0.7
0.15
--
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9059-11 April 2018
RT9059
Parameter
Reference Voltage
Fixed Output Voltage
Accuracy
VOUT Load Regulation
OUT Line Regulation
Dropout Voltage
Current Limit
Short Circuit Current
VOUT Pull Low Resistance
Thermal Shutdown
Temperature
Thermal Shutdown Recovery
Temperature
PGOOD Rising Threshold
PGOOD Hysteresis
PGOOD Delay Time
PGOOD Sink Capability
EN Input
Voltage
EN Delay Time
EN Pin Bias Current
VDD Pin Shutdown Current
VIN Pin Shutdown Current
Inrush Current
Soft-Start Time
I
EN
I
SHDN_VDD
I
SHDN_VIN
I
INRUSH
t
SS
V
EN
= 5V
V
EN
= 0V
V
EN
= 0V, V
IN
= 5V
V
OUT
= 1.8V, C
OUT
= 10F,
I
LOAD
= 1A
Logic-High
Logic-Low
V
LOAD
V
LINE
V
DROP
I
LIM
I
SC
R
PULL
T
SD
T
SDR
V
TH_PGOOD
V
PGOOD
V
IH
V
IL
I
SINK
= 10mA
V
OUT
rising
I
OUT
= 1mA to 3A,
V
IN
= V
OUT
+ 1V
V
DD
= 3.6V to 5.5V,
V
IN
= V
OUT
+ 1V to 5V, I
OUT
= 1mA
I
OUT
= 2A
I
OUT
= 3A
V
IN
= 3.6V
V
OUT
< 0.2V
V
EN
= 0V
Symbol
V
REF
Test Conditions
Min
0.788
1.5
--
--
--
--
3.1
1
--
--
--
--
--
--
--
1.2
--
0.3
--
--
--
--
1.9
Typ
0.8
--
0.5
0.2
250
350
3.6
1.4
150
160
90
90
10
1
0.2
--
--
0.85
12
--
--
0.5
2.8
Max
0.812
1.5
1
0.6
350
450
4.2
1.8
--
--
--
--
--
1.5
0.4
--
0.4
1.4
--
1
1
--
3.75
Unit
V
%
%
%
mV
A
A
ºC
ºC
%
%
ms
V
V
ms
A
A
A
A
ms
V
TH_PGOOD
V
OUT
falling
Note 1.
Stresses beyond those listed
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may
affect device reliability.
Note 2.
θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
θ
JC
is
measured at the exposed pad of the package.
Note 3.
Devices are ESD sensitive. Handling precaution recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9059-11 April 2018
www.richtek.com
5
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