RT9172S-32GM [RICHTEK]
3A Fixed Output Voltage LDO Regulator; 3A固定输出电压LDO稳压器型号: | RT9172S-32GM |
厂家: | RICHTEK TECHNOLOGY CORPORATION |
描述: | 3A Fixed Output Voltage LDO Regulator |
文件: | 总15页 (文件大小:225K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
RT9172
3A Fixed Output Voltage LDO Regulator
General Description
Features
ꢀ Low Dropout Voltage
The RT9172 series of low-dropout linear regulators operate
from a +2.25V to +6.0V input supply.Awide 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.
ꢀ Low Ground Pin Current
ꢀ Load Regulation of 0.4% at 3A
ꢀ 0.5mA 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
ꢀ RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
Applications
-
RT9172
ꢀ Microprocessor Power Supplies
ꢀ GTL, GTL+, BTL, and SSTL Bus Terminators
ꢀ Power Supplies for DSPs
ꢀ SCSI Terminator
Package Type
T5 : TO-220-5
M5 : TO-263-5
T : TO-220
M : TO-263
G : SOT-223
S : SOP-8
ꢀ Post Regulators
ꢀ High Efficiency Linear Regulators
ꢀ Battery Chargers
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
ꢀ Other Battery Powered Applications
Pin Configurations
Output Voltage
15 : 1.5V
16 : 1.6V
:
(TOP VIEW)
32 : 3.2V
33 : 3.3V
S : Pin Out Exchange
N : Pin 5 bond SENSE
F : Pin 5 bond FLG
1
2
3
TO-220
VIN GND
(TAB)
VOUT
Note :
TO-263
RichTek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
VOUT
SENSE
GND
VIN
8
7
6
5
`Suitable for use in SnPb or Pb-free soldering processes.
`100%matte tin (Sn) plating.
2
3
4
GND
GND
EN
1
2
3
NC
VIN GND VOUT
(TAB)
SOP-8
SOT-223
DS9172-14 March 2007
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1
RT9172
5
4
3
2
SENSE/FLG
VOUT
SENSE/FLG
VOUT
5
4
3
2
1
GND (TAB)
VIN
GND (TAB)
VIN
EN
EN
1
TO-220-5
TO-263-5
RT9172N-
RT9172F-
CT5
CT5
RT9172N-
RT9172F-
CM5
CM5
5
4
3
2
1
VOUT
VOUT
SENSE
GND (TAB)
EN
5
4
3
2
1
SENSE
GND (TAB)
EN
VIN
VIN
TO-220-5
TO-263-5
RT9172S- CM5
RT9172S-
CT5
Functional Pin Description
Pin No.
RT9172- ꢁꢁCT
RT9172- ꢁꢁCM
RT9172- ꢁꢁCG
--
Pin Name
Pin Function
RT9172F RT9172N RT9172S
1
2
3
4
5
--
1
2
3
4
--
5
2
1
3
5
--
4
EN
Chip Enable (Active Hight)
Power Input Voltage
Ground
1
2
VIN
GND
VOUT
FLG
3
Output Voltage
ERROR Flag
--
--
SENSE
Remote Sense
Typical Application Circuit
RT9172-25
VIN VOUT
GND
V
OUT
V
= 3.3V
IN
2.5V, 3A
C
10uF
C
IN
OUT
Figure 1
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2
DS9172-14 March 2007
RT9172
Trace resistance = R
t
RT9172N-25
VIN VOUT
V
= 3.3V
V
= 2.5V
IN
LOAD
I
C
10uF
LOAD
10K
IN
L
O
A
D
C
EN
SENSE
GND
OUT
Figure 2
Trace resistance = R
t
RT9172F-25
V
= 2.5V
OUT
VIN
VOUT
V
= 3.3V
V
= 2.5V -I
R
LOAD t
IN
LOAD
I
C
10uF
LOAD
IN
10K
10K
L
C
EN
FLG
OUT
O
A
D
GND
Figure 3
Recommend COUT: Please note that the part must be paralleled with the least a 100μF electrolytic capacitor when
using a 10μF (or greater) ceramic type as the output capacitor to prevent the output oscillating.
Function Block Diagram
RT9172F
VOUT
VIN
Thermal
Buffer
Amlifier
Current
Limiting
Sensor
EN
-
-
+
FLG
VREF
GND
DS9172-14 March 2007
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3
RT9172
RT9172N/RT9172S
VOUT
VIN
Thermal
Buffer
SENSE
Amlifier
Current
Limiting
Sensor
EN
-
VREF
GND
RT9172
VOUT
VIN
Thermal
Buffer
Amlifier
Current
Limiting
Sensor
-
VREF
GND
Absolute Maximum Ratings
ꢀ Input Voltage------------------------------------------------------------------------------------------------------------ 6V
ꢀ Power Dissipation, PD @ TA = 25°C
SOT-223 ----------------------------------------------------------------------------------------------------------------- 0.741W
SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.625W
TO-263 ------------------------------------------------------------------------------------------------------------------- 2.222W
TO-220 ------------------------------------------------------------------------------------------------------------------- 1.820W
ꢀ Package Thermal Resistance (Note 4)
SOT-223, θJC ----------------------------------------------------------------------------------------------------------- 23°C/W
SOT-223, θJA ------------------------------------------------------------------------------------------------------------ 135°C/W
SOP-8, θJC -------------------------------------------------------------------------------------------------------------- 45°C/W
SOP-8, θJA -------------------------------------------------------------------------------------------------------------- 160°C/W
TO-263, θJC ------------------------------------------------------------------------------------------------------------- 7.8°C/W
TO-263, θJA ------------------------------------------------------------------------------------------------------------- 45°C/W
TO-220, θJC ------------------------------------------------------------------------------------------------------------- 15°C/W
TO-220, θJA ------------------------------------------------------------------------------------------------------------- 55°C/W
ꢀ ESD Rating ------------------------------------------------------------------------------------------------------------- 3 kV
ꢀ Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
ꢀ Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------- 260°C
ꢀ Junction Temperature Range---------------------------------------------------------------------------------------- −40°C to +125°C
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DS9172-14 March 2007
RT9172
Electrical Characteristics
(Limits in standard typeface are for TA = 25°C, unless otherwise specified: VIN = VO(NOM) + 1.0V, IL = 10mA,
COUT = 10μF(Electrolytic), VEN = VIN)
Parameter
Output Voltage Tolerance
Input Voltage Range
Line Regulation
Symbol
Test Conditions
Min
-1.5
2.25
--
Typ
0
Max
+1.5
5.5
1
Units
%
--
V
V
IN
0.35
0.4
0.1
0.1
400
1.2
0.5
5
%
ΔV
V
+ 0.4V < V < 5.5V
LINE
OUT
IN
Note 1
Note 2
Note 3
--
1
Load Regulation
--
%
0.4
0.4
700
3
ΔV
LOAD
DROP
--
Dropout Voltage
--
mV
mA
μA
A
V
I = 3A
L
Quiescent Current
--
I
I
I
Q
Shutdown Supply Current
Peak Output Current
Short Circuit Protection
Current Limit
--
5
V
= 0V
GSD
EN
3.5
--
O(PEAK)
3.5
5
--
A
I
LIMIT
Over Temperature Protection
Shutdown Threshold
Thermal Shutdown Hysteresis
Shutdown Function
Guaranteed by design
Guaranteed by design
--
--
170
10
--
--
T
°C
°C
SD
Output = High
Output = Low
1.2
--
VIN
0
--
0.4
--
EN Pin Shutdown Threshold
V
V
EN
EN Input Current
--
0.1
1
nA
nA
V
EN
= V
IN
FLG Pin Leakage Current
FLG Pin Sink Current
--
--
I
LEAKAGE
2
--
--
mA
V
FLG
= 0.5V
Note 1. RT9172-CX, RT9172F-XXCX5, 10mA < IL < 3A
Note 2. RT9172S-XXCX5, RT9172N-XXCX5, 10mA < IL < 3A
Note 3. RT9172CS, 10mA < IL < 1.5A
Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard. The case point of θJC is on the center of the exposed pad. The pad size
is 125mm2 on TO-263 packages.
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5
RT9172
Typical Operating Characteristics
Temperature Stability
Quiescent Current vs. Load Current
2.60
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
2.56
2.52
2.48
VOUT = 2.5V
CIN = 1uF (Ceramic)
COUT = 10uF (Tantalum)
IN = VO + 1.0V
ILOAD = 10mA
VOUT = 2.5V
CIN = 1uF (Ceramic)
2.44
2.40
V
C
V
OUT = 10uF (Tantalum)
IN = VO + 1.0V
-35
-15
5
25
45
65
85
105 125
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Temperature(°C)
Load Current (A)
Quiescent Current vs. Supply Voltage
Quiescent Current vs. Temperature
1.5
1.2
0.9
0.6
0.3
0.0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
VOUT = 2.5V
VOUT = 2.5V
CIN = 1uF (Ceramic)
C
IN = 1uF (Ceramic)
COUT = 10uF (Tantalum)
VIN = 2V to 6V
C
V
OUT = 10uF (Tantalum)
IN = VO + 1.0V
ILOAD = 10mA
ILOAD = 10mA
2.0
2.5 3.0
3.5
4.0
4.5
5.0
5.5
6.0
-35 -15
5
25
45
65
85
105 125
Temperature
(°C)
Supply Voltage (V)
Current Limit vs. Temperature
Dropout Voltage (VIN - VOUT
)
6.0
5.2
4.4
3.6
2.8
2.0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
VOUT = 2.5V
VOUT = 2.5V
IN = 1uF (Ceramic)
COUT = 10uF (Tantalum)
CIN = 1uF (Ceramic)
COUT = 10uF (Tantalum)
VIN = VOUT + 1.0V
C
TJ = 125°C
TJ = 25°C
-35
-15
5
25
45
65
85
105 125
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Temperature
(°C)
Load Current (A)
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DS9172-14 March 2007
RT9172
PSRR
Load Regulation Deviation
-15
-20
-25
-30
-35
-40
-45
-50
-55
0.00
-0.03
-0.06
-0.09
-0.12
-0.15
VOUT = 2.5V
COUT = 10uF (Electrolytic)
ILOAD = 100mA
ILOAD = 10mA
VOUT = 2.5V
IN = 1uF (Ceramic)
COUT = 10uF (Tantalum)
ILOAD = 10mA
C
10
100
1K
10K
100K
1M
-35
-15
5
25
45
65
85
105 125
Frequency (Hz)
Temperature (°C)
EN Pin Shutdown Response
Range of Stable ESR Values
100
2
CIN = 1uF (MLCC)
COUT = 10uF (MLCC)
1
10
1
0
VOUT = 1.8V
CIN = 1uF (Ceramic)
COUT = 10uF (Tantalum)
ILOAD = 100mA
TA = 25°C
Stable Region
≈
≈
2
1
0.1
0.01
0
Reqion of Instability
0
1
2
3
4
5
6
7
8
9
10
0
0.5
1
1.5
2
2.5
3
Output Current (A)
Time (ms)
Line Transient Response
Line Transient Response
CIN = 1uF (Ceramic)
VOUT = 2.5V
TA = 25°C
COUT = 10uF (Tantalum)
ILOAD = 100mA
COUT = 10uF (Electrolytic)
ILOAD = 100mA
CIN = 1uF (Ceramic)
VOUT = 2.5V
TA = 25°C
40
20
0
40
20
0
≈
≈
≈
≈
5.5
4.5
3.5
5.5
4.5
3.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Time (ms)
Time (ms)
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7
RT9172
Load Transient Response
Load Transient Response
CIN = 1uF (Ceramic)
VOUT = 2.5V
TA = 25°C
COUT = 100uF (Electrolytic)
LOAD :100mA 3A
CIN = 1uF (Ceramic)
VOUT = 2.5V
TA = 25°C
COUT = 10uF (Tantalum)
ILOAD : 100mA 3A
I
200
100
0
200
100
0
≈
≈
≈
≈
6
3
0
6
3
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
Time (ms)
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
Time (ms)
Noise Signal
Noise Signal
CIN = 1uF (Ceramic)
VOUT = 2.5V
TA = 25°C
COUT = 10uF (Tantalum)
ILOAD :10mA
CIN = 1uF (Ceramic)
VOUT = 2.5V
TA = 25°C
COUT = 10uF (Tantalum)
LOAD :100mA
I
1.5
1.0
0.5
0
1.5
1.0
0.5
0
-0.5
-1.0
-0.5
-1.0
-1.5
-1.5
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
Time (ms)
Time (ms)
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DS9172-14 March 2007
RT9172
Application Information
Sense Pin
Capacitor Selection
In applications where the regulator output is not very close
to the load, RT9172 can provide better remote load
regulation using the SENSE pin. Figure 2. and Figure 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 be 3V with 3A
of load current, ILOAD. 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 Figure 2. and Figure 3.
ꢀ
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 10μF or greater,
the output capacitor should have an ESR less than 2Ω.
This will improve transient response as well as promote
stability.
ꢀ Ultra-low-ESR capacitor (<100mΩ), 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 <2Ω. 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.
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 pin must be tied to
VIN if not used.
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. Please note that the part must be
paralleled with the least a 100μF electrolytic capacitor
when using a 10μF (or greater) ceramic type as the
output capacitor to prevent the output oscillating.
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 RDS(ON) 160mΩ. For CMOS LDOs, the dropout
voltage is the product of the load current and the RDS(ON)
of the internal MOSFET.
Error Operation (FLG)
Maximum Output Current Capability
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.
RT9172 can deliver a continuous current of 1.5Aover the
full operating temperature range.Aheatsink 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 = (VIN
- VOUT) IOUT+ (VIN) IGND
The internal error FLG comparator has an open drain
output stage. Hence, the FLG pin should be pulled high
through a pull up resistor.
where IGND is the operating ground current of the device
(specified under Electrical Characteristics).
DS9172-14 March 2007
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9
RT9172
Outline Dimension
C
D
F
M
E1
E
L1
b1
A1
L2
e
b
b2
A
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
0.385
0.300
0.090
0.440
0.103
0.690
0.297
0.146
0.190
0.115
0.040
0.060
0.022
0.055
0.420
0.370
0.110
0.510
0.113
0.730
0.340
0.156
A
A1
b
b1
b2
C
D
E
e
E1
F
L1
L2
M
3-Lead TO- 220 Plastic Package
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DS9172-14 March 2007
RT9172
C
D
U
B
V
E
L1
b1
L2
e
b2
b
A
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
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11
RT9172
D
D1
H
C
B
L
L1
e
e
A
A1
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
0.071
0.0047
0.031
0.146
0.287
0.264
0.124
0.093
0.013
0.077
0.013
A
A1
b
1.450
0.020
0.610
3.302
6.706
6.299
2.896
2.261
0.229
1.550
0.800
1.803
0.100
0.787
3.708
7.290
6.706
3.150
2.362
0.330
1.950
1.100
0.057
0.0008
0.024
0.130
0.264
0.248
0.114
0.089
0.009
0.061
0.009
B
C
D
D1
e
H
L
L1
3-Lead SOT-223 Surface Mount Package
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12
DS9172-14 March 2007
RT9172
C
D
M
F
E1
E
P
A1
e
b
b2
A
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
0.385
0.300
0.440
0.560
0.146
0.972
0.190
0.115
0.040
0.022
0.055
0.072
0.420
0.370
0.510
0.595
0.156
1.040
A
A1
b
b2
C
e
D
E
E1
F
M
P
5-Lead TO-220 Plastic Package
DS9172-14 March 2007
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13
RT9172
C
D
U
B
V
E
L1
L2
b
e
b2
A
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
www.richtek.com
14
DS9172-14 March 2007
RT9172
H
A
M
J
B
F
C
I
D
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
B
C
D
F
H
I
4.801
3.810
1.346
0.330
1.194
0.170
0.050
5.791
0.400
5.004
3.988
1.753
0.508
1.346
0.254
0.254
6.200
1.270
0.189
0.150
0.053
0.013
0.047
0.007
0.002
0.228
0.016
0.197
0.157
0.069
0.020
0.053
0.010
0.010
0.244
0.050
J
M
8-Lead SOP Plastic Package
Richtek Technology Corporation
Headquarter
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
8F, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
DS9172-14 March 2007
www.richtek.com
15
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