®
RT9041A/B
500mA, Low Voltage, LDO Regulator with External Bias
Supply
General Description
The RT9041A/B are low voltage, low dropout linear
regulators with an external bias supply input. The bias
supply drives the gate of the internal N-Channel pass
transistor, making these devices ideal for applications that
require low voltage outputs from low voltage inputs.
RT9041A and RT9041B provide the fixed version from 1V
to 2V with 0.1V increment. Besides, RT9041B provides
more feature by using external resistors as adjustable
output voltage. The RT9041A/B include a current limit and
thermal shutdown that protects the regulator in the event
of a fault condition.
The RT9041A/B is available in a SOT-23-6 package.
Features
±
2% Output Voltage Accuracy
No Minimum Load Current Required
1V to 5.5V Input Supply Voltage
3V to 5.5V Input Bias Supply Voltage
PGOOD Open-Drain Output (RT9041A)
Support Both Fixed/Adjustable Mode (RT9041B)
Low Supply Current
5μA (max) Shutdown Supply Current
μ
RoHS Compliant and Halogen Free
Applications
Notebook Computers
VID Power Supplies
PDAs
Cell Phones
Low Dropout Regulators with External Bias Supply
Ordering Information
RT9041
-
Package Type
E : SOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Voltage
Fixed Only (RT9041A)
Fixed & Adjustable (RT9041B)
10 : 1.0V/Adj
11 : 1.1V/Adj
:
19 :1.9V/Adj
20 : 2.0V/Adj
A : Fixed with PGOOD
B : Fixed/Adjustable
Pin Configuration
(TOP VIEW)
VIN VOUT PGOOD
6
5
2
4
3
VDD GND EN
RT9041A
VIN VOUT ADJ
6
5
2
4
3
Note :
½
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
½
VDD GND EN
RT9041B
SOT-23-6
Suitable for use in SnPb or Pb-free soldering processes.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9041A/B-05 November 2017
www.richtek.com
1
RT9041A/B
Typical Application Circuit
RT9041A
V
DD
3V to 5.5V
1
VDD
VIN
VOUT
6
5
C
IN
10µF
C
OUT
10µF
100k
V
IN
1V to 5.5V
V
OUT
C
VDD
0.1µF 2
GND
3
EN
Chip Enable
PGOOD 4
RT9041B
V
DD
3V to 5.5V
1
C
VDD
0.1µF
VDD
VIN 6
C
IN
10µF
VOUT 5
EN
ADJ 4
R2
R1
C
OUT
10µF
V
IN
1V to 5.5V
2 GND
3
Chip Enable
V
OUT
Function Pin Description
Pin No.
RT9041A
1
6
5
3
2
4
--
RT9041B
1
6
5
3
2
--
4
Pin Name
VDD
VIN
VOUT
EN
GND
PGOOD
ADJ
Pin Function
Supply voltage of control circuitry.
Supply input voltage.
Output voltage.
Chip enable (Active-High).
Ground.
Power good open drain output.
Set the output voltage by the internal feedback resistors when ADJ is
grounded. If external feedback resistors is used, V
OUT
= V
REF
x (R1 + R2)/R2.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9041A/B-05 November 2017
RT9041A/B
Functional Block Diagram
VIN
OCP
VOUT
Driver
V
IN
+
-
Error
Amplifier
OTP
EN
VDD
POR
0.8V
-
PGOOD
+
0.7V
GND
RT9041A
VIN
OCP
VOUT
Driver
V
IN
+
-
Error
Amplifier
OTP
EN
VDD
POR
0.8V
Mode
ADJ
GND
RT9041B
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9041A/B-05 November 2017
www.richtek.com
3
RT9041A/B
Absolute Maximum Ratings
(Note 1)
6V
6V
6V
0.4W
250°C/W
Supply Input Voltage, VDD ----------------------------------------------------------------------------------------------
Input Voltage, VIN ---------------------------------------------------------------------------------------------------------
Other Input/Output Pins -------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-6 --------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
SOT-23-6,
θ
JA
---------------------------------------------------------------------------------------------------------------
SOT-23-6,
θ
JC
-------------------------------------------------------------------------------------------------------------- 135°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−
65°C to 150°C
ESD Susceptibility (Note3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
(Note 4)
1V to 5.5V
3V to 5.5V
−
40°C to 125°C
−
40°C to 85°C
Recommended Operating Conditions
Supply Input Voltage, VIN -----------------------------------------------------------------------------------------------
Control Voltage, VDD -----------------------------------------------------------------------------------------------------
Junction Temperature Range --------------------------------------------------------------------------------------------
Ambient Temperature Range --------------------------------------------------------------------------------------------
Electrical Characteristics
(V
IN
= 1.8V, I
LOAD
= 1mA, C
OUT
= 10μF, T
A
= 25°C unless otherwise specified)
Parameter
Input
Output Voltage Range
(for RT9041A only)
Output Voltage Range
(for RT9041B only)
Bias Input Under Voltage Lockout
VIN Shutdown Current
Quiescent Current
VDD Shutdown Current
Regulator Characteristics
Line Regulation
Load Regulation
Output Voltage Accuracy
(RT9041A)
Output Voltage Accuracy
(RT9041B)
Reference Voltage (RT9041B)
Symbol
Test Conditions
Min
Typ
Max
Unit
V
OUT
V
OUT
1
0.8
--
--
--
2.7
1
160
1
2
2.5
--
5
250
5
V
V
V
A
A
A
I
SHDN
I
Q
I
SHDN
V
OUT
/
V
IN
V
OUT
/
I
IN
V
OUT
V
OUT
1V < V
IN
< 5.5V, V
IN
= V
OUT
+ 0.6V
3V < V
DD
< 5.5V
3V < V
DD
< 5.5V
I
OUT
= 10mA, 1.5V < V
IN
< 5.5V,
V
IN
= V
OUT
+ 0.6V
V
IN
= V
OUT
+ 0.6V,
I
OUT
= 1mA to 500mA
V
IN
= V
OUT
+ 0.6V, I
OUT
= 10mA
V
IN
= V
OUT
+ 0.6V, I
OUT
= 10mA,
Short ADJ to GND
I
OUT
= 10mA
--
--
--
0.15
--
2
2
0.784
--
0.2
--
--
0.8
0.15
1
2
2
0.816
%/V
%
%
%
V
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9041A/B-05 November 2017
RT9041A/B
Parameter
Dropout Voltage
Current Limit
Thermal-Shutdown Temp
Thermal-Shutdown Hysteresis
ADJ
ADJ Pin Threshold (RT9041B)
PGOOD Comparator
Comparator Threshold
Comparator Hysteresis
Logic and I/O
EN Input Voltage
EN Current
PGOOD Output Low Voltage
(RT9041A)
PGOOD Output High Leakage
Current (RT9041A)
Dynamics
PGOOD Propagation Delay
(RT9041A)
t
PGOOD
Rising edge within 5% of
regulation level
1
--
5
ms
Logic-High
Logic-Low
V
IH
V
IL
I
EN
V
EN
= 5V
PGOOD sinking 1mA
0 < V
PGOOD
< V
IN
1.6
--
--
--
1
--
--
12
--
--
--
0.8
--
0.1
1
V
V
A
V
A
V
HYST
% of regulated output voltage
(Note 5)
--
--
88
10
--
--
%
mV
--
0.2
--
V
Symbol
V
DROP
I
LIM
T
SD
T
SD
Test Conditions
I
LOAD
= 300mA, V
DD
V
OUT
2.1V
I
LOAD
= 500mA, V
DD
V
OUT
2.1V
R
LOAD
= 0
3V < V
BIAS
< 5.5V
Min
--
--
550
--
--
Typ
200
300
700
160
20
Max
300
500
1400
--
--
Unit
mV
mA
°C
°C
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 low effective thermal conductivity single-layer test board per JEDEC 51-3
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Note 5.
Guaranteed by design.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9041A/B-05 November 2017
www.richtek.com
5
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