RT9172N-16CG [RICHTEK]
3A FIXED OUTPUT VOLTAGE LDO REGULATOR; 3A固定输出电压LDO稳压器
| 型号： | RT9172N-16CG |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | 3A FIXED OUTPUT VOLTAGE LDO REGULATOR |
| 文件： | 总16页 (文件大小：342K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary
RT9172
3A Fixed Output Voltage LDO Regulator
General Description
Features
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.
z Low Dropout Voltage
z Low Ground Pin Current
z Load Regulation of 0.4% at 3A
z 0.5µA Quiescent Current in Shutdown Mode
z Guaranteed Output Current of 3A DC
z Available in TO-263 and TO-220 Packages
z Output Voltage Accuracy 1.5%
z Error Flag Indicates Output Status
z Sense Option Improves Better Load Regulation
z Extremely Low Output Capacitor Requirements
z Over-temperature/Over-current Protection
Applications
Ordering Information
z Microprocessor Power Supplies
z GTL, GTL+, BTL, and SSTL Bus Terminators
z Power Supplies for DSPs
z SCSI Terminator
RT9172ꢀ-ꢀꢀ ꢀ ꢀ
Package type
T5 : TO-220-5
M5 : TO-263-5
T : TO-220
z Post Regulators
z High Efficiency Linear Regulators
z Battery Chargers
M : TO-263
G : SOT-223
Operating temperature range
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
z Other Battery Powered Applications
Pin Configurations
Part Number
Pin Configurations
TOP VIEW
RT9172-ꢀꢀCT
(Plastic TO-220)
:
1. VIN
2. GND (TAB)
3. VOUT
32 : 3.2V
33 : 3.3V
S: Pin out exchange
N : Pin 5 bond sense
F : Pin 5 bond flg
1
2
3
TOP VIEW
RT9172-ꢀꢀCM
(Plastic TO-263)
1. VIN
2. GND (TAB)
3. VOUT
1
2
2
3
TOP VIEW
RT9172-ꢀꢀCG
(Plastic SOT-223)
1. VIN
2. GND (TAB)
3. VOUT
1
3
To be continued
DS9172-03 April 2002
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1
Preliminary
RT9172
Part Number
Pin Configurations
Part Number
Pin Configurations
TOP VIEW
TOP VIEW
RT9172N-ꢀꢀCT5
RT9172F-ꢀꢀCT5
(Plastic TO-220-5)
RT9172S-ꢀꢀCT5
(Plastic TO-220-5)
1. EN
2. VIN
1. VIN
2. EN
3. GND (TAB)
4. VOUT
3. GND (TAB)
4. SENSE
12 3 4 5
5. SENSE/FLG
5. VOUT
12 3 4 5
TOP VIEW
TOP VIEW
RT9172N-ꢀꢀCM5
RT9172F-ꢀꢀCM5
(Plastic TO-263-5)
RT9172S-ꢀꢀCM5
(Plastic TO-263-5)
1. EN
2. VIN
1. VIN
2. EN
3. GND (TAB)
4. VOUT
3. GND (TAB)
4. SENSE
1 2
3
4 5
1 2
3 4 5
5. SENSE/FLG
5. VOUT
Typical Application Circuit
RT9172-25
VOUT
VIN
V
V
= 3.3V
OUT
IN
2.5V, 3A
GND
C
IN
C
OUT
1 F
µ
Fig. 1
Trace resistance = R
t
RT9172N-25
VOUT
V
LOAD
= 2.5V
V
IN
= 3.3V
VIN
EN
I
LOAD
OUT
L
C
IN
C
O
A
D
GND SENSE
µ
10 F
Fig. 2
Trace resistance = R
t
RT9172F-25
VOUT
VOUT = 2.5V
10K
V
LOAD
= 2.5V-I
R
LOAD t
V
IN
= 3.3V
VIN
EN
10K
I
LOAD
C
OUT
L
C
IN
GND FLG
O
A
D
10µF
Fig. 3
: (1) 10µF (or larger) electrolytic or tantalum capacitance
(2) 1µF or 10µF ceromic capacitor parrell with 100µF electrolytic or tantalum capacitance
Recommend C
OUT
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DS9172-03 April 2002
2
Preliminary
RT9172
Function Block Diagram
RT9172F
VIN
VOUT
Buffer
Thermal
Amplifier
Current
Limiting
Sensor
EN
_
+
_
+
FLG
GND
Vref
RT9172N/RT9172S
VIN
VOUT
SENSE
Buffer
Thermal
Amplifier
Current
Limiting
Sensor
EN
_
+
Vref
GND
RT9172
VIN
VOUT
Buffer
Thermal
Amplifier
Current
Limiting
Sensor
_
+
Vref
GND
DS9172-03 April 2002
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3
Preliminary
RT9172
Absolute Maximum Ratings
z Input Voltage
6V
z Power Dissipation
z ESD Rating
Internally Limited
3 kV
z Storage Temperature Range
z Lead Temperature (Soldering, 5 sec.)
z Package Thermal Resistance
−65°C to 150°C
260°C
TO-263, θ
8°C/W
JC
TO-263, θ
19.4°C/W
8°C/W
62°C/W
JA
JC
TO-220, θ
TO-220, θ
JA
SOT-223, θ
15°C/W
JC
SOT-223, θ
60°C/W
JA
z Junction Temperature Range
-40°C to +125°C
Electrical Characteristics
(Limits in standard typeface are for T = 25°C, unless otherwise specified: V = V
+ 1.0V, I = 10mA, C
=
OUT
A
IN
O(NOM)
L
10µF (Ceramic), V = V )
EN
IN
Parameter
Output Voltage Tolerance
Input Voltage Range
Line Regulation
Symbol
Test Conditions
Min
-1.5
2.25
--
Typ
0
Max
+1.5
6
Units
%
--
V
V
IN
0.35
0.4
0.1
50
0.8
1
%
∆V
V
+ 0.4V < V < 6.0V
LINE
OUT IN
Note 1
Note 2
--
Load Regulation
Dropout Voltage
%
∆V
LOAD
--
0.3
70
700
3
--
I = 300mA
L
mV
V
DROP
--
400
1.2
0.5
5
I = 3A
L
Quiescent Current
--
mA
µA
A
I
I
I
Q
Shutdown Supply Current
Peak Output Current
--
5
V
= 0V
GSD
EN
3.5
--
O(PEAK)
Short Circuit Protection
Current Limit
3.5
5
--
A
I
LIMIT
Over Temperature Protection
Shutdown Threshold
Guaranteed by design
Guaranteed by design
--
--
170
10
--
--
T
°C
°C
SD
Thermal Shutdown Hysteresis
Shutdown Function
Output = High
Output = Low
1.2
--
--
0.4
--
--
--
V
0
IN
EN Pin Shutdown Threshold
V
V
EN
EN Input Current
FLG Pin Leakage Current
FLG Pin Sink Current
--
--
2
0.1
1
--
nA
nA
mA
V
EN
= V
IN
I
LEAKAGE
V
FLG
= 0.5V
Note 1: RT9172-CX, RT9172F-XXCX5, 10mA < I < 3A
L
Note 2: RT9172S-XXCX5, RT9172N-XXCX5, 10mA < I < 3A
L
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DS9172-03 April 2002
4
Preliminary
RT9172
Pin Description
Pin No.
Pin Name
Pin Function
RT9172F RT9172N RT9172S
RT9172
1
2
3
4
5
--
1
2
3
4
--
5
2
1
3
5
--
4
--
1
EN
Chip Enable
VIN
Power Input
Ground
2
GND
VOUT
FLG
3
Output Voltage
ERROR Flag
Remote Sense
--
--
SENSE
DS9172-03 April 2002
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5
Preliminary
RT9172
Typical Operating Charateristics
PSRR
PSRR
0
0
-10
-20
-30
-40
-50
-60
-70
C
C
V
= 1nF
C
C
V
= 1nF
OUT
= 5V
= 2.5V
IN
OUT
IN
= 10µF Electrolytic Capacitor
= 68µF Tantalum Capacitor
-10
-20
-30
-40
-50
-60
-70
= 5V
= 2.5V
= 25°C
IN
IN
V
T
V
T
OUT
OUT
= 25°C
A
A
10mA
10mA
100mA
100mA
10
100
1K
10K
100K
1M
10
100
1K
10K
100K
1M
Frequency (Hz)
Frequency (Hz)
Noise Signal & Spectrum Distribution
Noise Signal & Spectrum Distribution
Time (mS)
Time (mS)
0
2
4
6
8
10
0
2
4
6
8
10
1000
1500
500
0
-1000
-500
≈
≈
C
C
= 1µF
C
C
= 1µF
IN
OUT
IN
OUT
80
40
0
80
40
0
= 10µF Tantalum Capacitor
= 10µF Tantalum Capacitor
Load = 100mA
Load = 10mA
Sampling Rate = 250KHz
Sampling Rate = 250KHz
0
25
50
75
100
125
0
25
50
75
100
125
Frequency (KHz)
Frequency (KHz)
Noise Signal & Spectrum Distribution
Noise Signal & Spectrum Distribution
Time (mS)
Time (mS)
0
2
4
6
8
10
0
≈
0
2
4
6
8
10
200
200
1000
1000
0
0
-1000
-1000
≈
C
C
= 1µF
IN
OUT
C
C
= 1µF
IN
OUT
80
40
0
80
40
0
= 68µF Tantalum Capacitor
= 68µF Tantalum Capacitor
Load = 100mA
Load = 10mA
Sampling Rate = 250KHz
Sampling Rate = 250KHz
0
25
50
75
100
125
25
50
75
100
125
Frequency (KHz)
Frequency (KHz)
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DS9172-03 April 2002
6
Preliminary
RT9172
Load Transient Response
Load Transient Response
0.3
0.2
0.1
0.3
0.2
0.1
CIN = 10µF Electrolytic
OUT = 10µF Tantalum
CIN = 68µF Tantalum
OUT = 10µF Tantalum
VIN = 3.5V
VIN = 3.5V
C
C
T
T
>
>
0
0
-0.1
-0.1
T
1
1
T
>
>
0.1
0.1
0
10 20 30 40 50 60 70 80 90 100
0
10 20 30 40 50 60 70 80 90 100
Time (µS)
Time (µS)
Line Transient Response
Line Transient Response
150
100
50
150
100
50
COUT = 10µF
COUT = 68µF
VOUT = 2.5V
VOUT = 2.5V
Loading = 100mA
Loading = 100mA
T
>
>
0
0
-50
-50
≈
≈
≈
≈
T
4.5
3.5
4.5
T
>
3.5
↓
0
10 20 30 40 50 60 70 80 90 100
0
10 20 30 40 50 60 70 80 90 100
µ
µ
DS9172-03 April 2002
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7
Preliminary
RT9172
Functional Description
Capacitor Selection
Dropout Voltage
The RT9172 requires a minimum input capacitance of
1µF between the input and ground pins to prevent any
impedance interactions with the supply. The RT9172
requires a minimum of 10µF (tantalum, or electrolytic)
capacitance between the output and ground pins for
proper operation, if used 10µF ceromic please parrell
with 100µF tantalum or electrolytic. Larger capacitance
provides better load dynamics and noise performance.
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 MOS-FET with an R
160mΩ. For
DS(ON)
CMOS LDOs, the dropout voltage is the product of the
load current and the R of the internal MOSFET.
DS(ON)
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:
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.
PD = (V - V
) I
+ (V ) I
IN
OUT OUT IN GND
Sense Pin
where I
is the operating ground current of the
GND
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 100mΩ, the voltage at the remote load will
device (specified under Electrical Characteristics).
The maximum allowable temperature rise (T
)
RMAX
depends on the maximum ambient temperature
(T of the application, and the maximum
allowable junction temperature (T ):
)
AMAX
JMAX
T
= T
– T
RMAX
JMAX AMAX
The maximum allowable value for junction to ambient
Thermal Resistance, θ = T - T
The maximum allowable value for junction to ambient
Thermal Resistance, θ , can be calculated using the
formula:
JA
RMAX
AMAX
be 3V with 3A of load current, I
. The RT9172
LOAD
JA
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.
θ
JA
= T
/ P
RMAX 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
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 10kΩ 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
the maximum allowable value of θ calculated above
JA
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
pin must be tied to V if not used.
requirements. If the value for allowable θ falls below
IN
JA
these limits, a heat sink is required.
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DS9172-03 April 2002
8
Preliminary
RT9172
Heatsinking TO-220Packages
As shown in the figure, increasing the copper area
beyond square inch produces very little
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
1
improvement. The minimum value for θ for the TO-
JA
263 package mounted to a PCB is 32°C/W.
values of θ will be same as shown in next section for
JA
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 θ of TO-263 package
JA
for different copper area sizes, using a typical PCB with
1 ounce copper and no solder mask over the copper
area for heat sinking.
θJA vs. Copper (1 Ounce) Area for TO-263
200
180
160
4W
140
120
100
2.5W
80
60
1W
40
20
0
0
0.5
1
1.5
2
2.5
3
Copper Foil Area (SQ. IN.)
Fig. 4
DS9172-03 April 2002
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9
RT9172
Package Information
Preliminary
D
A
F
M
C
E1
E
MARK
L1
A1
b2
b1
b
L2
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
4.064
2.032
0.635
1.143
0.305
1.143
9.779
7.620
2.286
11.176
2.616
17.526
7.544
3.708
Max
4.826
2.921
1.016
1.524
0.559
1.397
10.668
9.398
2.794
12.954
2.870
18.542
8.636
3.962
Min
Max
0.160
0.080
0.025
0.045
0.012
0.045
0.190
0.115
0.040
0.060
0.022
0.055
A
A1
b
b1
b2
C
D
0.385
0.300
0.090
0.440
0.103
0.690
0.297
0.146
0.420
0.370
0.110
0.510
0.113
0.730
0.340
0.156
E
e
E1
F
L1
L2
M
3-Lead TO-220 Plastic Package
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DS9172-03 April 2002
10
Preliminary
RT9172
A
D
C
B
MARK
E
L1
b1
b
L2
b2
e
U
V
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
4.064
1.143
0.660
1.143
0.305
1.143
9.652
8.128
2.286
14.605
2.286
Max
4.826
1.676
0.914
1.397
0.584
1.397
10.668
9.652
2.794
15.875
2.794
Min
Max
A
B
0.160
0.045
0.026
0.045
0.012
0.045
0.380
0.320
0.090
0.575
0.090
0.190
0.066
0.036
0.055
0.023
0.055
0.420
0.380
0.110
0.625
0.110
b
b1
b2
C
D
E
e
L1
L2
U
6.223 Ref.
7.620 Ref.
0.245 Ref.
0.300 Ref.
V
3-Lead TO- 263 Surface Mount
DS9172-03 April 2002
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11
RT9172
Preliminary
D
D1
B
C
L
e
e
H
A
A1
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
--
Max
1.803
0.100
0.787
3.708
7.290
6.706
3.150
2.362
0.330
--
Min
--
Max
0.071
0.0047
0.031
0.146
0.287
0.264
0.124
0.093
0.013
--
A
A1
b
0.0008
0.020
0.610
3.302
6.706
6.299
2.896
2.261
0.229
0.914
0.024
0.130
0.264
0.248
0.114
0.089
0.009
0.036
B
C
D
D1
e
H
L
3-Lead SOT-223 Plastic Surface Mount
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DS9172-03 April 2002
12
Preliminary
RT9172
D
A
M
C
F
E1
MARK
E
P
A1
b2
e
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
4.064
2.032
0.635
0.305
1.143
1.524
9.779
7.620
11.176
14.224
3.708
24.689
Max
4.826
2.921
1.016
0.559
1.397
1.829
10.668
9.398
12.954
15.113
3.962
26.416
Min
Max
0.160
0.080
0.025
0.012
0.045
0.060
0.190
0.115
0.040
0.022
0.055
0.072
A
A1
b
b2
C
c
D
0.385
0.300
0.440
0.560
0.146
0.972
0.420
0.370
0.510
0.595
0.156
1.040
E
E1
F
M
P
5-Lead TO-220 Plastic Package
DS9172-03 April 2002
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13
RT9172
Preliminary
A
D
C
B
MARK
E
L1
L2
b2
b
e
U
V
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
4.064
1.143
0.660
0.305
1.143
9.652
8.128
1.524
14.605
2.286
Max
4.826
1.676
0.914
0.584
1.397
10.668
9.652
1.829
15.875
2.794
Min
Max
0.160
0.045
0.026
0.012
0.045
0.380
0.320
0.060
0.575
0.090
0.190
0.066
0.036
0.023
0.055
0.420
0.380
0.072
0.625
0.110
A
B
b
b2
C
D
E
e
L1
L2
U
V
6.223 Ref.
7.620 Ref.
0.245 Ref.
0.300 Ref.
5-Lead TO-263 Plastic Surface Mount Package
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DS9172-03 April 2002
14
Preliminary
RT9172
DS9172-03 April 2002
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15
RT9172
Preliminary
RICHTEK TECHNOLOGY CORP.
Headquarter
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
6F, No. 35, Hsintai Road, Chupei City
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5510047 Fax: (8863)5537749
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek-ic.com.tw
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DS9172-03 April 2002
16
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SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9137
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SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
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