Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
1
3A Fixed Output Voltage LDO Regulator
General Description
The RT9172 series of low-dropout linear regulators
operate from a +2.25V to +6.0V input supply. A wide
range of preset output voltage options is available.
These low dropout linear regulators respond very
fast to step changes in load, which are suitable for
low voltage microprocessor applications. The
RT9172 uses an internal PMOS as the pass device,
which does not cause extra GND current in heavy
load and dropout condition. The shutdown mode of
low operation current makes the IC suitable for
power-saving systems. The other features include
current limiting and over temperature protection.
Ordering Information
RT9172 -
Features
Low Dropout Voltage
Low Ground Pin Current
Load Regulation of 0.4% at 3A
0.5
A Quiescent Current in Shutdown Mode
Guaranteed Output Current of 3A DC
Available in TO-263 and TO-220 Packages
Output Voltage Accuracy
1.5%
Error Flag Indicates Output Status
Sense Option Improves Better Load Regulation
Extremely Low Output Capacitor Requirements
Over-temperature/Over-current Protection
Applications
Microprocessor Power Supplies
GTL, GTL+, BTL, and SSTL Bus Terminators
Power Supplies for DSPs
SCSI Terminator
Post Regulators
High Efficiency Linear Regulators
Battery Chargers
Other Battery Powered Applications
Pin Configurations
Part Number
Pin Configurations
RT9172-
CT
(Plastic TO-220)
TOP VIEW
1. VIN
2. GND (TAB)
3. VOUT
RT9172-
CM
(Plastic TO-263)
TOP VIEW
1. VIN
2. GND (TAB)
3. VOUT
RT9172-
CG
(Plastic SOT-223)
TOP VIEW
1. VIN
2. GND (TAB)
3. VOUT
To be continued
1 2 3
1
2
3
1
2
3
Operating temperature range
C: Commercial standard
Package type
T5 : TO-220-5
M5 : TO-263-5
T : TO-220
M : TO-263
G : SOT-223
S : SOP-8
Output voltage
15 : 1.5V
16 : 1.6V
:
32 : 3.2V
33 : 3.3V
S : Pin out exchange
N : Pin 5 bond "SENSE"
F : Pin 5 bond "FLG"
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
2
Part Number
Pin Configurations
RT9172N-
CT5
RT9172F-
CT5
(Plastic TO-220-5)
TOP VIEW
1. EN
2. VIN
3. GND (TAB)
4. VOUT
5. SENSE/FLG
RT9172N-
CM5
RT9172F-
CM5
(Plastic TO-263-5)
TOP VIEW
1. EN
2. VIN
3. GND (TAB)
4. VOUT
5. SENSE/FLG
RT9172-
CS
(Plastic SOP-8)
TOP VIEW
Part Number
Pin Configurations
RT9172S-
CT5
(Plastic TO-220-5)
TOP VIEW
1. VIN
2. EN
3. GND (TAB)
4. SENSE
5. VOUT
RT9172S-
CM5
(Plastic TO-263-5)
TOP VIEW
1. VIN
2. EN
3. GND (TAB)
4. SENSE
5. VOUT
Pin Description
Pin No.
RT9172F
RT9172N
RT9172S
RT9172-
CT
RT9172-
CM
RT9172-
CG
Pin Name
Pin Function
1
1
2
--
EN
Chip Enable
2
2
1
1
VIN
Power Input
3
3
3
2
GND
Ground
4
4
5
3
VOUT
Output Voltage
5
--
--
--
FLG
ERROR Flag
--
5
4
--
SENSE
Remote Sense
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
1 2 3 4 5
VOUT
SENSE
GND
NC
VIN
GND
GND
EN
1
2
3
4
8
7
6
5
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
3
Typical Application Circuit
Fig. 1
Fig. 2
Fig. 3
Recommend C
OUT
: Please note that the part must be paralleled with the least a 100
F electrolytic capacitor when
using a 10
F (or greater) ceramic type as the output capacitor to prevent the output oscillating.
VIN VOUT
EN GND SENSE
C
OUT
L
O
A
D
I
LOAD
V
LOAD
= 2.5V
RT9172N-25
V
IN
= 3.3V
C
IN
10
F
Trace resistance = R
t
10K
VIN
VOUT
EN GND FLG
C
OUT
10K
10K
V
OUT
= 2.5V
L
O
A
D
I
LOAD
Trace resistance = R
t
V
LOAD
= 2.5V-I
LOAD
R
t
RT9172F-25
V
IN
= 3.3V
C
IN
10
F
V
IN
= 3.3V
VIN VOUT
GND
C
OUT
V
OUT
2.5V, 3A
C
IN
10
F
RT9172-25
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
4
Function Block Diagram
RT9172F
RT9172N/RT9172S
RT9172
+
_
Buffer
Amplifier
Thermal
Current
Limiting
Sensor
Vref
VOUT
FLG
GND
EN
VIN
+
_
Buffer
Amplifier
Thermal
Current
Limiting
Sensor
Vref
VOUT
EN
VIN
SENSE
GND
+
_
Buffer
Amplifier
Thermal
Current
Limiting
Sensor
Vref
VOUT
VIN
GND
+
_
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
5
Absolute Maximum Ratings
Input Voltage
6V
Power Dissipation
Internally Limited
ESD Rating
3 kV
Storage Temperature Range
-
65
C to 150
C
Lead Temperature (Soldering, 5 sec.)
260
C
Package Thermal Resistance
TO-263,
JC
8
C/W
TO-263,
JA
19.4
C/W
TO-220,
JC
8
C/W
TO-220,
JA
62
C/W
SOT-223,
JC
15
C/W
SOT-223,
JA
60
C/W
SOP-8,
JA
160
C/W
Junction Temperature Range
-40
C to +125
C
Electrical Characteristics
(Limits in standard typeface are for T
A
= 25
C, unless otherwise specified: V
IN
= V
O(NOM)
+ 1.0V, I
L
= 10mA, C
OUT
=
10F (Electrolytic), V
EN
= V
IN
)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Output Voltage Tolerance
-1.5
0
+1.5
%
Input Voltage Range
V
IN
2.25
--
5.5
V
Line Regulation
V
LINE
V
OUT
+ 0.4V
<
V
IN
<
5.5V
--
0.35
1
%
Note 1
--
0.4
1
Note 2
--
0.1
0.4
Load Regulation
V
LOAD
Note 3
--
0.1
0.4
%
Dropout Voltage
V
DROP
I
L
= 3A
--
400
700
mV
Quiescent Current
I
Q
--
1.2
3
mA
Shutdown Supply Current
I
GSD
V
EN
= 0V
--
0.5
5
A
Peak Output Current
I
O(PEAK)
3.5
5
--
A
Short Circuit Protection
Current Limit
I
LIMIT
3.5
5
--
A
Over Temperature Protection
Shutdown Threshold
T
SD
Guaranteed by design
--
170
--
C
Thermal Shutdown Hysteresis
Guaranteed by design
--
10
--
C
Shutdown Function
Output = High
1.2
V
IN
--
EN Pin Shutdown Threshold
V
EN
Output = Low
--
0
0.4
V
EN Input Current
V
EN
= V
IN
--
0.1
--
nA
FLG Pin Leakage Current
I
LEAKAGE
--
1
--
nA
FLG Pin Sink Current
V
FLG
= 0.5V
2
--
--
mA
Note 1: RT9172-CX, RT9172F-XXCX5, 10mA < I
L
< 3A
Note 2: RT9172S-XXCX5, RT9172N-XXCX5, 10mA < I
L
< 3A
Note 3: RT9172CS, 10mA < I
L
< 1.5A
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
6
Typical Operating Characteristics
Temperature Stability
2.40
2.44
2.48
2.52
2.56
2.60
-35
-15
5
25
45
65
85
105
125
Temperature ( C)
O
u
t
p
u
t
V
o
l
t
ag
e (V
)
V
OUT
= 2.5V
C
IN
= 1
F (Ceramic)
C
OUT
= 10
F (Tantalum)
V
IN
= V
O
+ 1.0V
I
LOAD
= 10mA
Quiescent Current vs. Load Current
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Load Current (A)
Q
u
i
e
s
c
e
n
t
Cu
rren
t
(m
A
)
V
OUT
= 2.5V
C
IN
= 1
F (Ceramic)
C
OUT
= 10
F (Tantalum)
V
IN
= V
O
+ 1.0V
Quiescent Current vs. Temperature
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
-35
-15
5
25
45
65
85
105
125
Temperature ( C)
Q
u
i
e
s
c
e
n
t
C
u
rre
n
t
(m
A
)
V
OUT
= 2.5V
C
IN
= 1
F (Ceramic)
C
OUT
= 10
F (Tantalum)
V
IN
= V
O
+ 1.0V
I
LOAD
= 10mA
Quiescent Current vs. Supply Voltage
0.0
0.3
0.6
0.9
1.2
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Supply Voltage (V)
Q
u
i
e
s
c
e
n
t
Cu
rre
n
t
(m
A
)
V
OUT
= 2.5V
C
IN
= 1
F (Ceramic)
C
OUT
= 10
F (Tantalum)
V
IN
: 2V ~ 6V
I
LOAD
= 10mA
Current Limit vs. Temperature
2.0
2.8
3.6
4.4
5.2
6.0
-35
-15
5
25
45
65
85
105
125
Temperature ( C)
Cu
rren
t
L
i
m
i
t
(A
)
V
OUT
= 2.5V
C
IN
= 1
F (Ceramic)
C
OUT
= 10
F (Tantalum)
V
IN
= V
OUT
+ 1.0V
Dropout Voltage (V
IN
- V
OUT
)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Load Current (A)
Drop
o
u
t
V
o
l
t
ag
e
(V
)
V
OUT
= 2.5V
C
IN
= 1
F (Ceramic)
C
OUT
= 10
F (Tantalum)
T
J
= 125
C
T
J
= 25
C
Dropout Voltage
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
7
Load Regulation Deviation
-0.15
-0.12
-0.09
-0.06
-0.03
0.00
-35
-15
5
25
45
65
85
105
125
Temperature ( C)
O
u
t
put
V
o
l
t
a
g
e
D
e
v
i
a
t
i
o
n (
%
)
V
OUT
= 2.5V
C
IN
= 1
F (Ceramic)
C
OUT
= 10
F (Tantalum)
I
LOAD
: no load ~ 1A
PSRR
-55
-50
-45
-40
-35
-30
-25
-20
-15
Frequency (Hz)
PS
R
R
(
d
B)
V
OUT
= 2.5V
C
OUT
= 10
F (Electrolytic)
I
LOAD
= 100mA
I
LOAD
= 10mA
10 100 1K 10K 100K 1M
Line Transient Response
Output Voltage
Deviation
(
mV
)
Input Voltage
Deviation
(
V
)
Time (mS)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
40
20
0
5.5
4.5
3.5
C
IN
= 1
F (Ceramic) C
OUT
=10
F (Electrolytic)
V
OUT
= 2.5V I
LOAD
= 100mA
T
A
= 25
C
Line Transient Response
Output Voltage
Deviation
(
mV
)
Input Voltage
Deviation
(
V
)
Time (mS)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
40
20
0
5.5
4.5
3.5
C
IN
= 1
F (Ceramic) C
OUT
= 10
F (Tantalum)
V
OUT
= 2.5V I
LOAD
= 100mA
T
A
= 25
C
EN Pin Shutdown Response
Output
V
o
l
tage
(
V
)
Shutdown Voltage
(V)
Time (mS)
0 1 2 3 4 5 6 7 8 9 10
2
1
0
2
1
0
C
IN
= 1
F (Ceramic) C
OUT
= 10
F (Tantalum)
V
OUT
= 1.8V I
LOAD
= 100mA
T
A
= 25
C
Range of Stable ESR Values
0.01
0.1
1
10
100
0
0.5
1
1.5
2
2.5
3
Output Current (A)
O
u
t
put
Capa
ci
t
o
r
ES
R(
m
)
Region of Instability
Stable Region
C
IN
= 1
F (MLCC)
C
OUT
= 10
F (MLCC)
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
8
Load Transient Response
Output Voltage
Deviation
(
mV
)
Load Cur
r
ent
Deviation
(
A
)
Time (mS)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
200
100
0
6
3
0
C
IN
= 1
F (Ceramic) C
OUT
=100
F(Electrolytic)
V
OUT
= 2.5V I
LOAD
: 100mA
3A
T
A
= 25
C
Load Transient Response
Output Voltage
Deviation
(
mV
)
Load Cur
r
ent
Deviation
(
A
)
Time (mS)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
400
200
0
6
3
0
C
IN
= 1
F (Ceramic) C
OUT
= 10
F (Tantalum)
V
OUT
= 2.5V I
LOAD
: 100mA
3A
T
A
= 25
C
Noise Signal
Output Voltage
(mV)
Time (mS)
0
1
2
3
4
5
6
7
8
9
10
1.5
1.0
0.5
0
C
IN
= 1
F (Ceramic) C
OUT
= 10
F (Tantalum)
V
OUT
= 2.5V I
LOAD
= 10mA
T
A
= 25
C
-0.5
-1.0
-1.5
Noise Signal
Output Voltage
(mV)
Time (mS)
0 1 2 3 4 5 6 7 8 9 10
1.5
1.0
0.5
0
C
IN
= 1
F (Ceramic) C
OUT
= 10
F (Tantalum)
V
OUT
= 2.5V I
LOAD
= 100mA
T
A
= 25
C
-0.5
-1.0
-1.5
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
9
Functional Description
Capacitor Selection
An output capacitor as part of the device frequency
compensation to maintain stability and improve
transient response.
Proper capacitor selection is important to ensure
proper operation. When the output capacitor is 10
F
or greater, the output capacitor should have an ESR
less than 2
. This will improve transient response as
well as promote stability.
Ultra-low-ESR capacitor (<100m
), such as ceramic
chip capacitors, may promote instability. These very
low ESR levels may cause an oscillation and/or
underdamped transient response. A low-ESR solid
tantalum capacitor works extremely well and
provides good transient response and stability over
temperature. Aluminum electrolytics can also be
used, as long as the ESR of the capacitor is <2
.
The value of the output capacitor can be increased
without limit. Higher capacitor values help to improve
transient response and ripple rejection and reduce
output noise.
The RT9172 requires a minimum input capacitance of
1
F between the input and ground pins to prevent any
impedance interactions with the supply. The RT9172
requires a minimum of 10
F (tantalum, or electrolytic)
capacitance between the output and ground pins for
proper operation. Please note that the part must be
paralleled with the least a 100
F electrolytic capacitor
when using a 10
F (or greater) ceramic type as the
output capacitor to prevent the output oscillating.
Error Operation (FLG)
The RT9172 produces a logic low signal at the FLG pin
when the output drops out of regulation due to low input
voltage, current limiting, or thermal limiting.
The internal error FLG comparator has an open drain
output stage. Hence, the FLG pin should be pulled high
through a pull up resistor.
Sense Pin
In applications where the regulator output is not very
close to the load, RT9172 can provide better remote
load regulation using the SENSE pin. Fig.2 and Fig.3
depict the advantage of the SENSE option. RT9172
regulates the voltage at the output pin. Hence, the
voltage at the remote load will be the regulator output
voltage minus the drop across the trace resistance.
For example, in the case of a 3.3V output, if the trace
resistance is 100m
, the voltage at the remote load
will be 3V with 3A of load current, I
LOAD
. The RT9172
regulates the voltage at the sense pin. Connecting the
sense pin to the remote load will provide regulation at
the remote load, as shown in Fig.2 and Fig.3.
Chip Enable Operation
A CMOS logic level signal at the chip enable (EN) pin
will turn-off the regulator. Pin EN must be actively
terminated through a 10k
pull-up resistor for a
proper operation. If this pin is driven from a source
that actively pulls high and low (such as a CMOS rail
to rail comparator), the pull-up resistor is not required.
This pin must be tied to V
IN
if not used.
Dropout Voltage
The dropout voltage of a regulator is defined as the
minimum input-to-output differential required to stay
within 2% of the output voltage. The RT9172 uses an
internal MOSFET with an R
DS(ON)
160m
. For CMOS
LDOs, the dropout voltage is the product of the load
current and the R
DS(ON)
of the internal MOSFET.
Maximum Output Current Capability
RT9172 can deliver a continuous current of 1.5 A over
the full operating temperature range. A heatsink may
be required depending on the maximum power
dissipation and maximum ambient temperature of the
application. Under all possible conditions, the junction
temperature must be within the range specified under
operating conditions. The total power dissipation of
the device is given by:
PD = (V
IN
- V
OUT
) I
OUT
+ (V
IN
) I
GND
where I
GND
is the operating ground current of the
device (specified under Electrical Characteristics).
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
10
The maximum allowable temperature rise (T
RMAX
)
depends on the maximum ambient temperature
(T
AMAX
) of the application, and the maximum allowable
junction temperature (T
JMAX
):
T
RMAX
= T
JMAX
T
AMAX
The maximum allowable value for junction to ambient
Thermal Resistance,
JA
=
T
RMAX
-
T
AMAX
The maximum allowable value for junction to ambient
Thermal Resistance,
JA
, can be calculated using the
formula:
JA
=
T
RMAX
/
P
D
RT9172 are available in TO-220, TO-263, and SOT-223
packages. The thermal resistance depends in amount
of copper area or heat sink, and on air flow. If the
maximum allowable value of
JA
calculated above is
60
C/W for TO-220 package,
60
C/W for TO-263
package, and
140
C/W for SOT-223 package, no
heatsink is needed since the package can dissipate
enough heat to satisfy these requirements. If the value
for allowable
JA
falls below these limits, a heat sink is
required.
Heatsinking TO-220Packages
The thermal resistance of a TO-220 package can be
reduced by attaching it to a heat sink or a copper plane
on a PC board. If a copper plane is to be used, the
values of
JA
will be same as shown in next section for
TO-263 package.
Heatsinking TO-263 and SOT-223 Packages
The TO-263 and SOT-223 packages use the copper
plane on the PCB as a heatsink. The tab of these
packages are soldered to the copper plane for heat
sinking. Fig.4 shows a curve for
JA
of TO-263 package
for different copper area sizes, using a typical PCB with
1 ounce copper and no solder mask over the copper
area for heat sinking.
As shown in the figure, increasing the copper area
beyond 1 square inch produces very little improvement.
The minimum value for
JA
for the TO-263 package
mounted to a PCB is 32
C/W.
JA
vs. Copper (1 Ounce) Area for TO-263
T
RM
AX
=
T
JM
A
X
-
T
AMAX
Fig. 4
0
20
40
60
80
100
120
140
160
180
200
0
0.5
1
1.5
2
2.5
3
Copper Foil Area (SQ. IN.)
4W
2.5W
1W
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
11
Package Information
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
4.064
4.826
0.160
0.190
A1
2.032
2.921
0.080
0.115
b
0.635
1.016
0.025
0.040
b1
1.143
1.524
0.045
0.060
b2
0.305
0.559
0.012
0.022
C
1.143
1.397
0.045
0.055
D
9.779
10.668
0.385
0.420
E
7.620
9.398
0.300
0.370
e
2.286
2.794
0.090
0.110
E1
11.176
12.954
0.440
0.510
F
2.616
2.870
0.103
0.113
L1
17.526
18.542
0.690
0.730
L2
7.544
8.636
0.297
0.340
M
3.708
3.962
0.146
0.156
3-Lead TO-220 Plastic Package
E
b2
A1
C
A
MARK
b1
b
M
D
L1
L2
F
E1
e
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
12
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
4.064
4.826
0.160
0.190
B
1.143
1.676
0.045
0.066
b
0.660
0.914
0.026
0.036
b1
1.143
1.397
0.045
0.055
b2
0.305
0.584
0.012
0.023
C
1.143
1.397
0.045
0.055
D
9.652
10.668
0.380
0.420
E
8.128
9.652
0.320
0.380
e
2.286
2.794
0.090
0.110
L1
14.605
15.875
0.575
0.625
L2
2.286
2.794
0.090
0.110
U
6.223 Ref.
0.245 Ref.
V
7.620 Ref.
0.300 Ref.
3-Lead TO- 263 Surface Mount
C
A
b2
b1
MARK
b
L1
D
E
B
L2
e
V
U
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
13
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
--
1.803
--
0.071
A1
0.020
0.100
0.0008
0.0047
b
0.610
0.787
0.024
0.031
B
3.302
3.708
0.130
0.146
C
6.706
7.290
0.264
0.287
D
6.299
6.706
0.248
0.264
D1
2.896
3.150
0.114
0.124
e
2.261
2.362
0.089
0.093
H
0.229
0.330
0.009
0.013
L
0.914
--
0.036
--
3-Lead SOT-223 Plastic Surface Mount
H
L
e
e
D
D1
C
B
b
A
A1
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
14
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
4.064
4.826
0.160
0.190
A1
2.032
2.921
0.080
0.115
b
0.635
1.016
0.025
0.040
b2
0.305
0.559
0.012
0.022
C
1.143
1.397
0.045
0.055
c
1.524
1.829
0.060
0.072
D
9.779
10.668
0.385
0.420
E
7.620
9.398
0.300
0.370
E1
11.176
12.954
0.440
0.510
F
14.224
15.113
0.560
0.595
M
3.708
3.962
0.146
0.156
P
24.689
26.416
0.972
1.040
5-Lead TO-220 Plastic Package
E
b2
A1
C
A
MARK
M
D
F
E1
b
P
e
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
15
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
4.064
4.826
0.160
0.190
B
1.143
1.676
0.045
0.066
b
0.660
0.914
0.026
0.036
b2
0.305
0.584
0.012
0.023
C
1.143
1.397
0.045
0.055
D
9.652
10.668
0.380
0.420
E
8.128
9.652
0.320
0.380
e
1.524
1.829
0.060
0.072
L1
14.605
15.875
0.575
0.625
L2
2.286
2.794
0.090
0.110
U
6.223 Ref.
0.245 Ref.
V
7.620 Ref.
0.300 Ref.
5-Lead TO-263 Plastic Surface Mount Package
e
MARK
b
L1
D
E
B
L2
C
A
b2
V
U
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
16
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
4.801
5.004
0.189
0.197
B
3.810
3.988
0.150
0.157
C
1.346
1.753
0.053
0.069
D
0.330
0.508
0.013
0.020
F
1.194
1.346
0.047
0.053
H
0.178
0.254
0.007
0.010
I
0.102
0.254
0.004
0.010
J
5.791
6.198
0.228
0.244
M
0.406
1.270
0.016
0.050
8Lead SOP Plastic Package
F
A
J B
D
I
C
M
H
Preliminary
RT9172
DS9172-05 August 2002
www.richtek.com
17
RT9172
Preliminary
www.richtek.com
DS9172-05 August 2002
18
RICHTEK TECHNOLOGY CORP.
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
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