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 SOP-8 and SOT-25 packages are
also available for larger power dissipation and
design flexibility.
1
2
3
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-25 and SOP-8 Packages
Pin Configurations
Part Number
RT9168/A-
CBR
Pin Configurations
TOP VIEW
5
4
(Plastic SOT-25)
1.
2.
3.
4.
5.
OUT
GND
IN
SHDN
NC
Applications
Cellular Telephones
Laptop, Notebook, and Palmtop Computers
Battery-powered Equipment
Hand-held Equipment
RT9168/A-
RT9168/A-
CS
CSH
OUT 1
GND 2
GND 3
NC 4
TOP VIEW
8 IN
7 GND
6 GND
5 SHDN/SHDN
(Plastic SOP-8)
Ordering Information
RT9168/A-
Package type
BR : SOT-25
S : SOP-8
SH : SOP-8, High shutdown
Operating temperature range
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
:
:
49 : 4.9V
50 : 5.0V
500mA Output current
200mA Output current
DS9168/A-03 May 2001
Typical Application Circuit
RT9168
V
IN
C
IN
1µF
IN
GND
SHDN
SHDN
NC
OUT
C
OUT
1µF
V
OUT
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1
RT9168/A
Marking Information
Part Number
RT9168-15CBR
RT9168-16CBR
RT9168-17CBR
RT9168-18CBR
RT9168-19CBR
RT9168-20CBR
RT9168-21CBR
RT9168-22CBR
RT9168-23CBR
RT9168-24CBR
RT9168-25CBR
RT9168-26CBR
RT9168-27CBR
RT9168-28CBR
RT9168-29CBR
RT9168-30CBR
RT9168-31CBR
RT9168-32CBR
RT9168-33CBR
RT9168-34CBR
RT9168-35CBR
RT9168-36CBR
RT9168-37CBR
RT9168-38CBR
RT9168-39CBR
RT9168-40CBR
RT9168-41CBR
RT9168-42CBR
RT9168-43CBR
RT9168-44CBR
RT9168-45CBR
RT9168-46CBR
RT9168-47CBR
RT9168-48CBR
RT9168-49CBR
RT9168-50CBR
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Marking
L0
L1
L2
L3
L4
L5
L6
L7
L8
L9
LA
LB
LC
LD
LE
LF
LG
LH
LJ
LK
LL
LM
LN
LP
LQ
LR
LS
LT
LU
LV
LW
LX
LY
LZ
CL
CM
Part Number
RT9168A-15CBR
RT9168A-16CBR
RT9168A-17CBR
RT9168A-18CBR
RT9168A-19CBR
RT9168A-20CBR
RT9168A-21CBR
RT9168A-22CBR
RT9168A-23CBR
RT9168A-24CBR
RT9168A-25CBR
RT9168A-26CBR
RT9168A-27CBR
RT9168A-28CBR
RT9168A-29CBR
RT9168A-30CBR
RT9168A-31CBR
RT9168A-32CBR
RT9168A-33CBR
RT9168A-34CBR
RT9168A-35CBR
RT9168A-36CBR
RT9168A-37CBR
RT9168A-38CBR
RT9168A-39CBR
RT9168A-40CBR
RT9168A-41CBR
RT9168A-42CBR
RT9168A-43CBR
RT9168A-44CBR
RT9168A-45CBR
RT9168A-46CBR
RT9168A-47CBR
RT9168A-48CBR
RT9168A-49CBR
RT9168A-50CBR
Marking
M0
M1
M2
M3
M4
M5
M6
M7
M8
M9
MA
MB
MC
MD
ME
MF
MG
MH
MJ
MK
ML
MM
MN
MP
MQ
MR
MS
MT
MU
MV
MW
MX
MY
MZ
CN
CP
DS9168/A-03 May 2001
2
RT9168/A
Pin Description
Pin Name
IN
GND
SHDN (SHDN)
NC
OUT
Pin Function
Input
Ground
Active Low (High) Shutdown Input
No Connection
Output
Function Block Diagram
SHDN
or
SHDN
VREF
+
_
Error Amp
MOS Driver
Current-Limit
and
Thermal
Protection
OUT
Shutdown
and
Logic Control
IN
GND
DS9168/A-03 May 2001
www.richtek-ic.com.tw
3
RT9168/A
Absolute Maximum Ratings
Input Voltage
Power Dissipation, P
D
@ T
A
= 25°C
SOT-25
SOP-8
Operating Junction Temperature Range
Storage Temperature Range
Package Thermal Resistance
SOT-25,
θ
JA
SOP-8,
θ
JA
Lead Temperature (Soldering, 5 sec.)
250°C/W
160°C/W
260°C
0.25W
0.625W
−40°C
to 125°C
−65°C
to 150°C
8V
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
Dropout Voltage
RT9168/A
(V
OUT
(Nominal)≥3.0V
RT9168/A
Version)
RT9168A
Line Regulation
Load Regulation
(Note)
Symbol
V
IN
∆V
OUT
I
MAX
I
LIMIT
Test Conditions
Min
2.9
2.7
-2
200
500
--
--
--
--
--
--
--
--
--
-0.2
--
--
2.2
--
--
--
--
--
Typ
--
--
--
--
--
300
700
80
90
90
1.1
55
220
600
--
0.01
0.01
--
--
--
0.01
155
58
Max
7
7
+2
--
--
--
--
150
150
150
5
100
300
750
+0.2
0.04
0.04
--
0.4
100
1
--
--
Units
V
%
mA
mA
mA
mA
µA
mV
mV
mV
mV
%/V
%/mA
V
V
nA
µA
°C
dB
I
L
= 50mA
I
L
= 1mA
R
LOAD
= 1 Ohm
No Load
I
G
I
OUT
= 200mA
I
OUT
= 500mA
I
OUT
= 1mA
I
OUT
= 50mA
I
OUT
= 200mA
I
OUT
= 500mA
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
RT9168/A
V
DROP
∆V
LINE
∆V
LOAD
SHDN, SHDN Input High Threshold V
IH
SHDN, SHDN Input Low Threshold
SHDN, SHDN Bias Current
Shutdown Supply Current
Thermal Shutdown Temperature
Ripple Rejection
V
IL
I
SD
I
GSD
T
SD
PSRR
Notes: Dropout voltage definition: V
IN
- V
OUT
when V
OUT
is 50 mV below the value of V
OUT
at V
IN
= V
OUT
+ 0.5V
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DS9168/A-03 May 2001
4
RT9168/A
Typical Operating Charateristics
Output Voltage vs. Temp.
3.33
3.32
120
105
GND Current vs. Temp.
Output Voltage (V)
3.31
3.30
3.29
3.28
3.27
3.26
3.25
-50
-25
0
25
50
75
GND Current (
µ
A)
90
75
60
45
30
15
V
OUT
= 3.3V
100
125
150
0
-50
-25
0
25
50
75
V
OUT
= 3.3V
100
125
150
°C
Temperature (
°C
)
)
Temperature (
°C
)
°C
)
Dropout Voltage vs. Output Current
300
250
480
Current Limit vs. Temp.
420
85°C
25°C
-40°C
Current Limit (mA)
Dropout Voltage
(mV)
(V)
360
300
240
180
120
60
200
150
100
50
0
0
25
50
75
100
125
V
OUT
= 3.3V
150
175
200
0
-50
-25
0
25
50
75
RT9168
V
OUT
= 3.3V
100
125
150
Output Current (mA)
Temperature (°C
)
(
°C
Current Limit vs. Temp.
900
800
70
60
50
PSRR
Current Limit (mA)
700
600
500
400
300
200
100
-50
-25
0
25
50
75
PSRR (dB)
RT9168A
V
OUT
= 3.3V
100
125
150
40
30
20
10
0
10
10
I
LOAD
= 1mA, C
OUT
= 4.7µF
V
OUT
= 3.3V
100
100
1K
1000
10K
10000
100K
100000
1M
100000
Temperature (
°C
)
)
Frequency (KHz)
DS9168/A-03 May 2001
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