RT9176-18PG [RICHTEK]
1.5A Fixed and Adjustable Low Dropout Positive Voltage Regulators; 1.5A固定和可调低压差正电压稳压器
| 型号： | RT9176-18PG |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | 1.5A Fixed and Adjustable Low Dropout Positive Voltage Regulators |
| 文件： | 总13页 (文件大小：242K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RT9176
1.5A Fixed and Adjustable Low Dropout Positive Voltage
Regulators
General Description
Features
z Low Dropout Performance, 1.5V Max.
z Full Current Rating Over Line and Temperature
z Fast Transient Response
The RT9176 series of high performance positive voltage
regulators is designed for applications requiring low dropout
performance at fully rated current.Additionally, the RT9176
series provides excellent regulation over variations in line
and load. Outstanding features include low dropout
performance at rated current, fast transient response,
internal current-limiting, and thermal-shutdown protection
of the output device. The RT9176 series of three terminal
regulators offers fixed and adjustable voltage options
available in space-saving SOT-223, TO-252, and TO-263
packages.
z
± 2% Output Voltage Accuracy
z 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, and 3.5V Fixed and
Adjustable Output Voltage
z SOT-223, TO-252, and TO-263 Packages
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Active SCSI Termination
z Low Voltage Microcontrollers
z Switching Power Supply Post-Regulator
Ordering Information
RT9176-
Pin ConFigurations
Package Type
G : SOT-223
L: TO-252
(TOP VIEW)
M : TO-263
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
3
2
1
VIN
VOUT (TAB)
ADJ/GND
Output Voltage
Default : Adjustable
15 : 1.5V
SOT-223
18 : 1.8V
25 : 2.5V
28 : 2.85V
33 : 3.3V
3
2
1
VIN
VOUT (TAB)
ADJ/GND
35 : 3.5V
Note :
RichTek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
TO-252
3
2
`Suitable for use in SnPb or Pb-free soldering processes.
`100%matte tin (Sn) plating.
VIN
VOUT (TAB)
ADJ/GND
1
TO-263
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RT9176
Typical Application Circuit
RT9176
VIN
V
= 3.45V
VOUT
V
= 5V
OUT
IN
R1
133
1%
ADJ
V
REF
C1
10uF
C2
10uF
I
ADJ
R2
232
1%
Tantalum
R
R
2
1
V
= V
(1+
) + I
R
ADJ 2
OUT
REF
(1)
C1 needed if device is far from filter capacitors.
(2) C2 required for stability.
Figure 1. Adjustable Voltage Regulator
RT9176-33
VOUT
V
3.3V
OUT
VIN
V
= 5V
IN
GND
C1
10uF
C2
10uF
Tantalum
I
Q
(1) C1 needed if device is far from filter capacitors.
(2) C2 required for stability.
Figure 2. Active SCSI Bus Terminator
RT9176-28
18 - 27 Lines
VIN
VOUT
GND
10uF
22uF
I
Q
Figure 3. Fixed Voltage Regulator
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DS9176-11 March 2007
RT9176
Function Block Diagram
VIN
S.O.A.
Current
Limiting
Amplifier
LIMIT
VOUT
SENSE
Thermal Overload
Voltage
Regulation
Amplifer
VREF
ADJ/GND
Functional Pin Description
Pin Name
ADJ/GND
VOUT
Pin Function
Adjust Output Voltage or GND
Output Voltage
VIN
Power Input
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RT9176
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage-------------------------------------------------------------------------------------------------- 15V
z Power Dissipation, PD @ TA = 25°C
SOT-223 ----------------------------------------------------------------------------------------------------------------- 0.740W
TO-252 ------------------------------------------------------------------------------------------------------------------- 1.471W
TO-263 ------------------------------------------------------------------------------------------------------------------- 2.222W
z Package Thermal Resistance (Note 6)
SOT-223, θJA ------------------------------------------------------------------------------------------------------------ 135°C/W
SOT-223, θJC ----------------------------------------------------------------------------------------------------------- 19°C/W
TO-252, θJA ------------------------------------------------------------------------------------------------------------- 68°C/W
TO-252, θJC ------------------------------------------------------------------------------------------------------------- 7.5°C/W
TO-263, θJA ------------------------------------------------------------------------------------------------------------- 45°C/W
TO-263, θJC ------------------------------------------------------------------------------------------------------------- 7.8°C/W
z Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------- 260°C
z Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 8kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 750V
Recommended Operating Conditions (Note 3)
z Supply Input Voltage-------------------------------------------------------------------------------------------------- 3V to 12V
z Junction Temperature Range---------------------------------------------------------------------------------------- −40°C to 125°C
Electrical Characteristics
(TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ Max Units
I
= 10mA, (V −V
) = 2V,
OUT
IN
OUT
1.243 1.256 1.281
1.231 1.256 1.294
V
V
Reference Voltage
(Note 4)
T = 25°C
A
RT9176
V
REF
10mA < I
1.5V < V -V
< 1.5A,
OUT
< 10V
IN OUT
1.5
1.5
1.53
1.55
I
= 10mA, V = 3.3V, T = 25°C 1.485
IN J
OUT
RT9176-15
RT9176-18
RT9176-25
RT9176-28
RT9176-33
RT9176-35
0 < I
< 1.5A, 3.3V < V < 10V
1.470
OUT
IN
1.815 1.85
1.815 1.87
2.500 2.544
2.500 2.550
2.850 2.910
2.850 2.936
3.300 3.365
3.300 3.400
3.500 3.570
3.500 3.605
I
= 10mA, V = 3.3V, T = 25°C 1.797
IN J
OUT
0 < I
< 1.5A, 3.3V < V < 10V
1.779
OUT
IN
I
= 10mA, V = 4.0V, T = 25°C 2.460
OUT
IN
J
0 < I
< 1.5A, 4.0V < V < 10V
2.450
OUT
IN
Output Voltage
(Note 4)
V
V
OUT
I
= 10mA, V = 4.25V, T = 25°C 2.822
OUT
IN
J
0 < I
< 1.5A, 4.25V < V < 10V
2.793
OUT
IN
I
= 10mA, V = 4.75V, T = 25°C 3.267
OUT
IN
J
0 < I
< 1.5A, 4.75V < V < 10V
3.234
3.465
3.430
OUT
IN
I
= 10mA, V = 5V, T = 25°C
IN J
OUT
0 < I
< 1.5A, 5.0V < V < 10V
IN
OUT
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DS9176-11 March 2007
RT9176
Parameter
RT9176
Symbol
Test Conditions
= 10mA,
Min Typ Max Units
I
OUT
--
0.1 0.3
%
1.5V ≤ V −V
≤ 10V
OUT
IN
RT9176-15
RT9176-18
RT9176-25
I
I
I
= 0mA, 3.3V ≤ V ≤ 15V
--
--
--
1
1
1
6
6
6
mV
mV
mV
OUT
OUT
OUT
IN
= 0mA, 3.3V ≤ V ≤ 15V
IN
Line Regulation
(Note 4)
ΔV
LINE
= 0mA, 4.0V ≤ V ≤ 15V
IN
RT9176-28
I
= 0mA, 4.25V ≤ V ≤ 15V
--
1
6
mV
OUT
IN
RT9176-33
RT9176-35
RT9176
I
I
= 0mA, 4.75V ≤ V ≤ 15V
--
--
--
--
--
--
--
--
--
1
1
6
6
mV
mV
OUT
OUT
IN
= 0mA, 5.0V ≤ V ≤ 15V
IN
(V −V
) = 3V, 0mA ≤ I ≤ 1.5A
OUT
0.2 0.4
%
mV
mV
mV
mV
mV
mV
V
IN
OUT
RT9176-15
RT9176-18
RT9176-25
RT9176-28
RT9176-33
RT9176-35
V
V
V
V
V
V
= 3.3V, 0 ≤ I
= 3.3V, 0 ≤ I
= 4.0V, 0 ≤ I
≤ 1.5A
1
1
1
1
1
1
10
10
10
10
12
15
IN
OUT
OUT
OUT
≤ 1.5A
≤ 1.5A
≤ 1.5A
IN
Load Regulation
(Note 4)
ΔV
LOAD
IN
= 4.25V, 0 ≤ I
= 4.75V, 0 ≤ I
= 5.0V, 0 ≤ I
IN
OUT
≤ 1.5A
OUT
IN
≤ 1.5A
OUT
IN
I
I
= 500mA
= 1.5A
-- 1.15 1.25
-- 1.3 1.5
1.5 1.75 --
OUT
OUT
Dropout Voltage
Current Limit
(Note 5)
V
DROP
V
I
I
V
= 5V
A
LIM
IN
Minimum Load Current RT9176
(V −V
) = 2V
--
--
5
5
10
10
mA
mA
IN
OUT
Quiescent Current
RT9176-XX
V
= 5V
Q
IN
f
= 120Hz ,
RIPPLE
Ripple Rejection
PSRR
--
72
--
dB
(V − V
) = 2V, V
= 1V
RIPPLE P-P
IN
OUT
Adjust Pin Current
I
--
--
65 120
0.2
μA
μA
ADJ
Adjust Pin Current Change
ΔI
10mA ≤ I
≤ 1.5A, V = 5V
5
ADJ
OUT
IN
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. Low duty cycle pulse testing with Kelvin connections.
Note 5. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV.
Note 6. 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 pad size is 6mm2 on SOT-223 packages, 100mm2 on TO-252
packages, 125mm2 on TO-263 packages.
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RT9176
Typical Operating Characteristics
Output Voltage vs. Temperature
Reference Voltage vs. Temperature
1.27
1.26
1.25
1.24
1.23
3.4
V
= 3.3V
OUT
3
2.6
2.2
1.8
1.4
V
V
= 2.5V
OUT
OUT
V
= 5V
IN
V
= 5V
IN
CIN = 10uF Electrolytic
CO = 10uF Tantalum
R1 = R2 = 100Ω
R =
∞
L
CIN = 10uF Electrolytic
CO = 10uF Tantalum
R =
∞
L
= 1.5V
0
-50
-25
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature(°C)
Temperature
(°C)
ADJ Pin Current vs. Temperature
Quiescent Current vs. Temperature
80
70
60
50
40
7
6
5
4
3
2
1
0
V
= 2.5V
OUT
V
= 5V
IN
CIN = 10uF Electrolytic
CO = 10uF Tantalum
R1 = R2 = 100Ω
∞
V
= 5V
IN
CIN = 10uF Electrolytic
O = 10uF Tantalum
C
R =
L
R = ∞
L
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature(°C)
Temperature
(°C)
Current Limit vs. Temperature
Current Limit vs. Input Voltage
2
1.9
1.8
1.7
1.6
1.5
3
2.5
2
V
= 2.5V, RL = 1Ω
OUT
V
= 2.5V, RL = 1Ω
OUT
1.5
1
V
= 5V
IN
0.5
0
CIN = 10uF Electrolytic
CO = 10uF Tantalum
CIN = 10uF Electrolytic
O = 10uF Tantalum
C
-50
-25
0
25
50
75
100
125
2
4
6
8
10
12
14
Temperature(°C)
Input Voltage (V)
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DS9176-11 March 2007
RT9176
Current Limit
Dropout Voltage vs. Load Current
1.3
1.2
1.1
1.0
0.9
0.8
3.5
3
V
= 2.5V
OUT
-40°C
2.5
2
25°C
1.5
1
V
= 5V, V
= 2.5V
IN
OUT
125°C
0.5
0
CIN = 10uF Electrolytic
CO = 10uF Tantalum
RL = 1Ω
CIN = 10uF Electrolytic
CO = 10uF Tantalum
0
0.3
0.6
0.9
1.2
1.5
Time (2.5ms/Div)
Load Current (A)
Line Transient Response
Line Transient Response
30
40
30
20
V = 2.5V
OUT
V
= 1.5V
OUT
C
O = 10uF Tantalum
C
O = 10uF Tantalum
20
10
ILOAD = 100mA
ILOAD = 100mA
0
0
-20
-10
7
6
5
7
6
5
Time (10us/Div)
Time (10us/Div)
Line Transient Response
Load Transient Response
40
30
20
300
200
100
V
= 3.3V
V
= 3.3V, V
= 1.5V
OUT
OUT
IN
CO = 10uF Tantalum
ILOAD = 100mA
CIN = CO = 10uF Tantalum
Preload = 0.1A
0
0
-20
-100
7
6
5
1
0.5
0
Time (10us/Div)
Time (10us/Div)
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RT9176
Load Transient Response
Load Transient Response
300
200
100
0
300
V
= 3.3V, V
= 1.5V
V
= 5V, V
= 2.5V
IN
OUT
IN
OUT
C
IN = CO = 10uF Tantalum
C
IN = CO = 10uF Tantalum
200
100
0
Preload = 0.1A
Preload = 0.1A
-100
-100
1
2
1
0
0.5
0
Time (10us/Div)
Time (10us/Div)
Load Transient Response
Load Transient Response
300
200
100
0
300
200
100
0
V
= 5V, V
= 2.5V
= 3.3V
OUT
IN
OUT
V
= 5V, V
IN
CIN = CO = 10uF Tantalum
Preload = 0.1A
CIN = CO = 10uF Tantalum
Preload = 0.1A
-100
-100
2
1
0
1
0.5
0
Time (10us/Div)
Time (10us/Div)
Load Transient Response
300
200
100
V
= 5V, V
= 3.3V
IN
OUT
C
IN = CO = 10uF Tantalum
Preload = 0.1A
0
-100
2
1
0
Time (10us/Div)
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DS9176-11 March 2007
RT9176
Application Information
Output voltage adjustment
Output Capacitor
Like most regulators, the RT9176 regulates the output by
comparing the output voltage to an internally generated
reference voltage. On the adjustable version as shown in
Figure 4, the VREF is available externally as 1.25V between
VOUT and ADJ. The voltage ratio formed by R1 and R2
should be set to conduct 10mA (minimum output load).
RT9176 requires a capacitor from VOUT toGNDto provide
compensation feedback to the internal gain stage. This is
to ensure stability at the output terminal. Typically, 10μF
tantalum or 50μF aluminum electrolytic is sufficient and
please takes the notice of output capacitor ESR range
(Figure 5).
The output voltage is given by the following equation:
The output capacitor does not have a theoretical upper
limit and increasing its value will increase stability.
COUT = 100μF or more is typical for high current regulator
design.
R2
VOUT = VREF (1+
) + IADJ R2
R
1
On fixed versions of RT9176, the voltage divider is provided
internally.
Region of Stable COUT ESR vs. Load Current
10
RT9176
VOUT
VIN
VOUT
VIN
C
C
= 100uF
= 10uF
OUT
Instable
ADJ
VREF
R1
R2
10uF
IADJ
10uF
OUT
1
0.1
65uA
Stable
CADJ
Figure 4. Basic Adjustable Regulator
Input Bypass Capacitor
Instable
0.01
An input capacitor is recommended. A 10μF tantalum on
the input is a suitable input bypassing for almost all
applications.
0
0.2
0.4
0.6
0.8
1
Load Current (A)
Figure 5
Adjust Terminal Bypass Capacitor
Load Regulation
The adjust terminal can be bypassed to ground with a
bypass capacitor (CADJ) to improve ripple rejection. This
bypass capacitor prevents ripple from being amplified as
the output voltage is increased. At any ripple frequency,
the impedance of the CADJ should be less than R1 to
prevent the ripple from being amplified:
When the adjustable regulator is used (Figure 6), the best
load regulation is accomplished when the top of the resistor
divider (R1) is connected directly to the output pin of the
RT9176. When so connected, RP is not multiplied by the
divider ratio. For Fixed output version, the top of R1 is
internally connected to the output and ground pins can be
connected to low side of the load.
(2p * fRIPPLE * CADJ) < R1
The R1 is the resistor between the output and the adjust
pin. Its value is normally in the range of 100-200Ω. For
example, with R1 = 124Ω and fRIPPLE = 120Hz, the CADJ
should be > 11μF.
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RT9176
R
Parasitic
P
RT9176
VOUT
Line Resistance
VIN
V
IN
GND
R1
(Connect R1 to VOUT or case)
R
L
R2
Connect R2 to load
Figure 6. Best Load Regulation Using Adjustable Output
Regulator
Thermal Protection
RT9176 has thermal protection which limits junction
temperature to 150°C. However, device functionality is only
guaranteed to a maximum junction temperature of +125°C.
The power dissipation and junction temperature for RT9176
are given by
PD = (VIN - VOUT) x IOUT
TJUNCTION = TAMBIENT + (PD x θJA)
Note: TJUNCTION must not exceed 125°C
Current Limit Protection
RT9176 is protected against overload conditions. Current
protection is triggered at typically 1.75A.
Thermal Consideration
The RT9176 series contain thermal limiting circuitry
designed to protect itself from over-temperature conditions.
Even for normal load conditions, maximum junction
temperature ratings must not be exceeded. As mention
in thermal protection section, we need to consider all
sources of thermal resistance between junction and
ambient. It includes junction-to-case, case-to-heat-sink
interface, and heat sink thermal resistance itself.
Junction-to-case thermal resistance is specified from the
IC junction to the bottom of the case directly below the
die. Proper mounting is required to ensure the best
possible thermal flow from this area of the package to the
heat sink. The case of all devices in this series is
electrically connected to the output. Therefore, if the case
of the device must be electrically isolated, a thermally
conductive spacer is recommended.
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DS9176-11 March 2007
RT9176
Outline Dimension
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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11
RT9176
D
U
C
D1
R
B
T
V
S
E
L1
L3
e
b1
L2
b
b2
A
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
2.388
2.032
0.889
Min
Max
0.094
0.080
0.035
0.086
0.035
0.020
A
B
2.184
0.889
0.508
b
b1
b2
C
1.016 Ref.
0.040 Ref.
0.457
0.457
6.350
5.207
5.334
2.108
9.398
0.584
0.584
6.731
5.461
6.223
2.438
0.018
0.018
0.250
0.205
0.210
0.083
0.370
0.023
0.023
0.265
0.215
0.245
0.096
0.410
D
D1
E
e
L1
L2
L3
U
10.414
0.508 Ref.
0.020 Ref.
0.025
0.040
0.635
1.016
3.810 Ref.
3.048 Ref.
0.150 Ref.
0.120 Ref.
V
R
0.200
2.500
0.500
0.850
3.400
0.850
0.008
0.098
0.020
0.033
0.134
0.033
S
T
3-Lead TO-252 Surface Mount Package
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DS9176-11 March 2007
RT9176
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 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
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