RT9168/A
200mA/500mA Fixed Output Voltage LDO Regulator
General Description
The RT9168/A is a 200mA/500mA low dropout and
micropower regulator suitable for portable applications.
The output voltages range from 1.5V to 5.0V in 100mV
increments and 2% accuracy. The RT9168/A is designed
for use with very low ESR capacitors. The output remains
stable even with a 1μF ceramic output capacitor.
The RT9168/A uses an internal PMOS 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 current limiting
and over temperature protection. The SOT-23-5 and
SOP-8 packages are also available for larger power
dissipation and design flexibility.
Features
Stable with Low-ESR Output Capacitor
Low Dropout Voltage (220mV at 200mA)
Low Operation Current
−
80μA Typical
μ
Shutdown Function
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
RT9168/A
Package Type
BR : SOT-23-5
S : SOP-8
SH : SOP-8, High Shutdown
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
15 : 1.5V
16 : 1.6V
:
:
49 : 4.9V
50 : 5.0V
500mA Output Current
200mA Output Current
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Pin Configurations
(TOP VIEW)
VOUT
GND
VIN
1
2
3
4
EN
5
NC
RT9168/A-
CBR
SOT-23-5
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.
100%matte tin (Sn) plating.
VOUT
GND
GND
NC
2
3
4
8
7
6
5
VIN
GND
GND
EN/EN
RT9168/A-
RT9168/A-
SOP-8
CS
CSH
DS9168/A-15 March 2007
www.richtek.com
1
RT9168/A
Absolute Maximum Ratings
Input Voltage ------------------------------------------------------------------------------------------------------------ 8V
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-5 ----------------------------------------------------------------------------------------------------------------
0.4W
SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.625W
Package Thermal Resistance (Note1)
SOT-23-5,
θ
JA
----------------------------------------------------------------------------------------------------------- 250°C/W
SOP-8,
θ
JA
-------------------------------------------------------------------------------------------------------------- 160°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
RT9168
RT9168A
RT9168
RT9168A
RT9168/A
GND Pin Current
RT9168
RT9168A
RT9168/A
Dropout Voltage
RT9168/A
(V
OUT
(Nominal)≥3.0V
RT9168/A
Version)
RT9168A
Line Regulation
Load Regulation
RT9168/A
RT9168A
EN, EN Input High Threshold
EN, EN Input Low Threshold
EN, EN Bias Current
Shutdown Supply Current
Thermal Shutdown Temperature
Ripple Rejection
(2)
Symbol
V
IN
ΔV
OUT
I
MAX
Test Conditions
Min
2.9
Typ
--
--
--
--
--
300
700
80
90
90
1.1
55
220
600
--
0.01
0.01
--
--
--
0.01
155
58
Max Units
7
7
+2
--
--
--
--
150
150
150
5
100
300
750
+0.2
0.04
0.04
--
0.4
100
1
--
--
V
V
nA
μA
°C
dB
mV
mV
mV
mV
%/V
%/mA
μA
%
mA
mA
mA
mA
V
I
L
= 50mA
I
L
= 1mA
2.7
-2
200
500
--
I
LIM
R
LOAD
= 1Ω
No Load
--
--
--
--
--
--
--
--
-0.2
--
--
2.2
--
--
I
G
I
OUT
= 200mA
I
OUT
= 500mA
I
OUT
= 1mA
V
DROP
I
OUT
= 50mA
I
OUT
= 200mA
I
OUT
= 500mA
ΔV
LINE
ΔV
LOAD
V
IH
V
IL
I
SD
I
GSD
T
SD
PSRR
V
IN
= (V
OUT
+0.15) to 7V, I
OUT
= 1mA
I
OUT
= 0mA to 200mA
I
OUT
= 0mA to 500mA
V
IN
= 3V to 5.5V
V
IN
= 3V to 5.5V
V
OUT
= 0V
--
--
F = 100Hz, C
BP
= 10nF, C
OUT
= 10μF
--
DS9168/A-15 March 2007
www.richtek.com
3
RT9168/A
Typical Operating Characteristics
Output Voltage vs. Temperature
3.33
3.32
GND Current vs. Temperature
120
105
GND Current (uA)1
V
OUT
= 3.3V
Output Voltage (V)
3.31
3.30
3.29
3.28
3.27
3.26
3.25
-50
-25
0
25
50
75
100
125
150
90
75
60
45
30
15
V
OUT
= 3.3V
0
-50
-25
0
25
50
75
100
125
150
Temperature
(
°
C)
Temperature
(
°
C)
Dropout Voltage vs. Output Current
300
250
Current Limit vs. Temperature
480
420
Dropout Voltage (mV)
85°C
200
150
100
50
Current Limit (mA)
360
300
240
180
120
60
25°C
-40°C
V
OUT
= 3.3V
0
0
25
50
75
100
125
150
175
200
RT9168
V
OUT
= 3.3V
-50
-25
0
25
50
75
100
125
150
0
Output Current (mA)
Temperature
(
°
C)
Current Limit vs. Temperature
900
800
PSRR
70
60
50
Current Limit (mA)
700
600
500
400
300
200
100
-50
-25
0
25
50
75
100
125
150
PSRR (dB)
40
30
20
RT9168A
V
OUT
= 3.3V
10
0
V
OUT
= 3.3V, I
LOAD
= 1mA
C
OUT
= 4.7V
10
10
100
100
1K
1000
10K
10000
100K
100000
1M
1000000
Temperature
(
°
C)
DS9168/A-15 March 2007
Frequency (kHz)
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5
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