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
www.richtek-ic.com.tw
1
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
www.richtek-ic.com.tw
DS9168/A-03 May 2001
4
嵌入式系统
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