RT9167/A
Low-Noise, Fixed Output Voltage,300mA/500mA LDO Regulator
General Description
The RT9167/A is a 300mA/500mA low dropout and low
noise micropower regulator suitable for portable
applications. The output voltages range from 1.5V to 5V
in 100mV increments and 2% accuracy. The RT9167/A is
designed for use with very low ESR capacitors. The output
remains stable even with 1μF ceramic output capacitor.
The RT9167/A uses
an internal P-MOSFET as the pass
device, which does not cause extra GND current in heavy
load and dropout conditions. The shutdown mode of nearly
zero operation current makes the IC suitable for battery-
powered devices. Other features include a reference
bypass pin to
improve low noise performance, current
limiting, and over temperature protection.
Features
Stable with Low-ESR Output Capacitor
Low Dropout Voltage (350mV @ 300mA)
Low Operation Current
−
80μA Typical
μ
Shutdown Function
Low Noise Output
Low Temperature Coefficient
Current and Thermal Limiting
Custom Voltage Available
SOT-23-5
and SOP-8 Packages
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Cellular Telephones
Laptop, Notebook, and Palmtop Computers
Battery-powered Equipment
Hand-held Equipment
Ordering Information
RT9167/A-
Package Type
B : SOT-23-5
BR : SOT-23-5 (R-Type)
S : SOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V
2H : 2.85V
500mA Output Current
300mA Output Current
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Configurations
(TOP VIEW)
VOUT
5
BP
4
BP
5
EN
4
2
3
2
3
VIN GND EN
VOUT GND VIN
SOT-23-5
SOT-23-5
(R-Type)
EN
VIN
VOUT
BP
8
2
3
4
7
6
5
GND
GND
GND
GND
SOP-8
DS9167/A-29 April 2011
www.richtek.com
1
RT9167/A
Typical Application Circuit
RT9167/A
V
IN
C
IN
1µF
IN
GND
EN
BP
OUT
C
OUT
1µF
V
OUT
+
+
Chip Enable
C
BP
10nF
Functional Pin Description
Pin Name
VIN
GND
EN
BP
VOUT
Pin Function
Power Input Voltage
Ground
Chip Enable (Active High)
Reference Noise Bypass
Output Voltage
Function Block Diagram
EN
VREF
BP
+
-
Error
Amplifier
Shutdown
and
Logic Control
VIN
MOS Driver
VOUT
Current-Limit and
Thermal Protection
R1
R2
GND
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DS9167/A-29 April 2011
RT9167/A
Absolute Maximum Ratings
Input Voltage ----------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-5 ---------------------------------------------------------------------------------------------------------------
SOP-8 ------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note1)
SOT-23-5,
θ
JA
---------------------------------------------------------------------------------------------------------
SOT-23-5,
θ
JC
---------------------------------------------------------------------------------------------------------
8V
0.4W
0.625W
250°C/W
130°C/W
SOP-8,
θ
JA
------------------------------------------------------------------------------------------------------------ 160°C/W
SOP-8,
θ
JC
------------------------------------------------------------------------------------------------------------ 60°C/W
Operating Junction Temperature Range -------------------------------------------------------------------------
−
40°C to 125°C
Storage Temperature Range ---------------------------------------------------------------------------------------
−
65°C to 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
Electrical Characteristics
(V
IN
= 5.0V, C
IN
= 1μF, C
OUT
= 1μF, T
A
= 25°C, unless otherwise specified)
Parameter
Input Voltage Range
Output Voltage Accuracy
Maximum Output
Current
Current Limit
RT9167
RT9167A
RT9167
RT9167A
RT9167/A
Quiescent Current
Symbol
V
IN
ΔV
OUT
Test Conditions
Min
2.9
Typ
--
--
--
--
--
--
700
80
90
90
1.1
55
350
600
--
--
--
--
--
--
0.01
155
Max
7
7
2
--
--
--
--
150
150
150
5
100
450
750
6
30
Unit
V
%
mA
I
L
= 50mA
I
L
= 1mA
2.7
-2
300
500
400
I
MAX
I
LIM
R
LOAD
= 1Ω
No Load
I
OUT
= 300mA
I
OUT
= 500mA
I
OUT
= 1mA
V
DROP
I
OUT
= 50mA
I
OUT
= 300mA
I
OUT
= 500mA
ΔV
LINE
V
IN
= (V
OUT
+0.15) to 7V, I
OUT
=1mA
I
OUT
= 0mA to 300mA
I
OUT
= 0mA to 500mA
V
IN
= 3V to 5.5V
V
IN
= 3V to 5.5V
mA
500
--
--
--
--
--
--
--
--
--
--
1.6
--
--
RT9167/A I
G
RT9167A
RT9167/A
μA
Dropout Voltage
(V
OUT(Normal)
= 3.0V
Version)
Line Regulation
(2)
RT9167/A
RT9167/A
RT9167A
mV
mV/V
mV
RT9167/A
Load Regulation
RT9167A
EN Input High Threshold
EN Input Low Threshold
EN Bias Current
Shutdown Supply Current
Thermal Shutdown Temperature
ΔV
LOAD
V
IH
V
IL
I
SD
35
--
0.4
100
1
--
V
V
nA
μA
°C
I
GSD
T
SD
V
OUT
= 0V
--
--
To be continued
DS9167/A-29 April 2011
www.richtek.com
3
RT9167/A
Parameter
Output Noise
Ripple Rejection
Symbol
e
NO
PSRR
Test Conditions
C
BP
= 10nF, C
OUT
= 10μF
F = 100Hz, C
BP
= 10nF, C
OUT
= 10μF
Min
--
--
Typ
350
58
Max
--
--
Unit
nV
Hz
dB
Note 1.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard. Pin 1 of SOP-8 and pin4 of SOT-23-5 packages are the case position for
θ
JA
measurement.
Note 2. The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
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DS9167/A-29 April 2011
RT9167/A
Typical Operating Characteristics
Output Voltage vs. Temperature
3.33
3.32
120
105
Quiescent Current vs. Temperature
Quiescent Current (uA)
1
Output Voltage (V)
3.31
3.30
3.29
3.28
3.27
3.26
90
75
60
45
30
15
V
OUT
= 3.3V
3.25
-50
-25
0
25
50
75
100
125
150
0
-50
-25
0
25
50
75
V
OUT
= 3.3V
100
125
150
Temperature
(
°
C)
Temperature
(
°
C)
Dropout Voltage vs. Load Current
250
Dropout Voltage vs. Load Current
600
125°C
Dropout Voltage (mV)
200
Dropout Voltage (mV)
125°C
25°C
150
500
25°C
400
300
200
100
0
100
-40°C
-40°C
50
RT9167
V
OUT
= 5V
0
0
0.05
0.1
0.15
0.2
0.25
0.3
RT9167A
V
OUT
= 3.3V
0
0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Load Current (A)
Load Current (A)
Current Limit vs. Temperature
700
650
900
800
Current Limit vs. Temperature
Current Limit (mA)
Current Limit (mA)
RT9167
V
OUT
= 5V
600
550
500
450
400
350
300
-50
-25
0
25
50
75
100
125
700
600
500
400
300
200
-50
-25
0
25
50
75
100
125
RT9167A
V
OUT
= 3.3V
Temperature
(
°
C)
Temperature
(
°
C)
DS9167/A-29 April 2011
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5
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