RT9164 [ETC]
1A FIXED AND ADJUSTABLE LOW DROPOUT POSITIVE VOLTAGE REGULATORS; 1A固定和可调低压差正稳压器
| 型号： | RT9164 |
| 厂家： | 
ETC |
| 描述： | 1A FIXED AND ADJUSTABLE LOW DROPOUT POSITIVE VOLTAGE REGULATORS |
| 文件： | 总12页 (文件大小：267K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RT9164
1A Fixed and Adjustable Low Dropout
Positive Voltage Regulators
General Description
Features
The RT9164 series of high performance positive
voltage regulators is designed for applications
requiring low dropout performance at fully rated
current. Additionally, the RT9164 series provides
excellent regulation over variations in line and load.
z Low Dropout Performance, 1.4V Max.
z Full Current Rating Over Line and Temperature
z Fast Transient Response
z
1% Output Voltage Accuracy
z 2.5V, 2.85V, 3.3V, and 3.5V Fixed/Adjustable
Output Voltage
Outstanding
features
include
low
dropout
performance at rated current, fast transient
response, internal current-limiting, and thermal-
shutdown protection of the output device. The
RT9164 series of three terminal regulators offers
fixed and adjustable voltage options available in
space-saving SOT-223, and TO-252 packages.
z SOT-223 and TO-252 Packages
Applications
z Active SCSI Termination
z Low Voltage Microcontrollers
z Switching Power Supply Post-Regulator
Ordering Information
Pin Configurations
RT9164-ꢀꢀ ꢀ ꢀ
Package type
Part Number
Pin Configurations
TOP VIEW
RT9164-ꢀꢀCG
(Plastic SOT-223)
G : SOT-223
L : TO-252 (DPAK)
LR : TO-252
1. ADJ/GND
2. VOUT (TAB)
3. VIN
1
2
3
Operating temperature range
C: Commercial standard
TOP VIEW
RT9164-ꢀꢀCL
(Plastic TO-252)
Output voltage
Default : Adjustable
25 : 2.5V
28 : 2.85V
33 : 3.3V
1. ADJ/GND
2. VOUT (TAB)
3. VIN
1
2
2
3
TOP VIEW
RT9164-ꢀꢀCLR
(Plastic TO-252)
35 : 3.5V
1. VIN
2. GND (TAB)
3. VOUT
1
3
DS9164-08 May 2001
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1
RT9164
Absolute Maximum Ratings
z
Input Voltage
12V
z
Package Thermal Resistance
SOT-223, θ
SOT-223, θ
15°C/W
60°C/W
JC
(1)
JA
TO-252, θ
TO-252, θ
15°C/W
56°C/W
JC
(1)
JA
z
z
z
Operating Junction Temperature Range
Storage Temperature Range
0°C to 125°C
−65°C to 150°C
260°C
Lead Temperature (Soldering, 10 sec.)
2
Note: (1) Minimum pad size of 0.038 IN
Electrical Characteristics
(T = 25°C, unless otherwise specified)
A
Parameter
Symbol
Test Conditions
= 10mA, (V -V ) = 2V,
Min
Typ Max Units
I
OUT
T = 25°C
A
IN OUT
1.238 1.250 1.262
1.225 1.250 1.270
V
V
(1)
RT9164
Reference Voltage
V
REF
OUT
10mA < I
< 1A,
OUT
1.4V < V -V
< 10V
IN OUT
2.475 2.500 2.525
2.450 2.500 2.550
2.820 2.850 2.880
2.790 2.850 2.910
3.267 3.300 3.333
3.235 3.300 3.365
3.465 3.500 3.535
3.430 3.500 3.570
V
V
V
V
V
V
V
V
I
= 10mA, V = 4.0V, T = 25°C
IN J
OUT
RT9164-25
RT9164-28
RT9164-33
0 < I
< 1A, 4.0V < V < 10V
IN
OUT
I
= 10mA, V = 4.25V, T = 25°C
IN J
OUT
0 < I
< 1A, 4.25V < V < 10V
IN
OUT
(1)
Output Voltage
V
I
= 10mA, V = 4.75V, T = 25°C
IN J
OUT
0 < I
< 1A, 4.75V < V < 10V
IN
OUT
I
= 10mA, V = 5V, T = 25°C
IN J
OUT
RT9164-35
RT9164
0 < I
I
< 1A, 5.0V < V < 10V
IN
OUT
= 10mA,
OUT
--
0.1
0.3
%
1.5V ≤ V -V
≤ 10V
IN OUT
RT9164-25
RT9164-28
RT9164-33
RT9164-35
--
--
--
--
1
1
1
1
6
6
6
6
mV
mV
mV
mV
I
I
I
I
= 0mA, 4.0V ≤ V ≤ 12V
IN
OUT
OUT
OUT
OUT
(1)
Line Regulation
∆V
∆V
LINE
= 0mA, 4.25V ≤ V ≤ 12V
IN
= 0mA, 4.75V ≤ V ≤ 12V
IN
= 0mA, 5.0V ≤ V ≤ 12V
IN
(V -V
0mA ≤ I
V
V
V
V
) = 3V,
OUT
IN OUT
RT9164
--
0.2
0.4
%
≤ 1A
RT9164-25
RT9164-28
RT9164-33
RT9164-35
--
--
--
--
1
1
1
1
10
10
10
15
mV
mV
mV
mV
= 4.0V, 0 ≤ I
≤ 1A
IN
IN
IN
IN
OUT
(1)
Load Regulation
LOAD
= 4.25V, 0 ≤ I
= 4.75V, 0 ≤ I
≤ 1A
OUT
≤ 1A
OUT
= 5.0V, 0 ≤ I
≤ 1A
OUT
To be continued
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DS9164-08 May 2001
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RT9164
Parameter
Symbol
Test Conditions
= 100mA
Min Typ Max Units
--
--
1.1
1.2
V
V
V
V
I
I
I
I
OUT
OUT
OUT
OUT
1.15 1.25
= 500mA
= 800mA
= 1000mA
= 5V
(2)
Dropout Voltage
V
DROP
--
1.2
1.3
--
1.3
1.4
--
Current Limit
1000
--
2000 mA
I
I
V
IN
LIMIT
Minimum Load Current RT9164
5
10
10
mA
mA
(V -V
IN OUT
) = 2V
Quiescent Current
RT9164-XX
--
5
V
= 5V
Q
IN
f
= 120Hz ,
OUT
RIPPLE
(V - V
IN
Ripple Rejection
PSRR
--
72
--
dB
) = 2V, V
= 1V
RIPPLE P-P
Adjust Pin Current
--
--
65
120
5
µA
µA
I
ADJ
Adjust Pin Current Change
0.2
∆I
10mA ≤ I ≤ 1A, V = 5V
OUT IN
ADJ
Notes:
(1) Low duty cycle pulse testing with Kelvin connections.
(2) ΔV and ΔV = 1%.
OUT
REF
Function Block Diagram
VIN
S.O.A.
CURRENT
LIMIT
LIMITING
AMPLIFIER
VOUT
SENSE
THERMAL OVERLOAD
VOLTAGE
REGULATION
AMPLIFIER
V
ADJ/GND
REF
Pin Description
Pin Name
ADJ/GND
VOUT
Pin Function
Adjust or Ground
Output Voltage
Power Input
VIN
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RT9164
Typical Application Circuit
RT9164
VIN
V
= 3.45V
V
= 5V
OUT
IN
VOUT
ADJ
R1
V
133
1%
REF
C2
+
+
C1
10 F
10µF
I
R2
ADJ
µ
Tantalum
232
1%
R2
R1
V
= V
(1+
) + I
R
ADJ 2
OUT
REF
(1) C1 needed if device is far from filter capacitors.
(2) C2 required for stability.
Fig. 1 Adjustable Voltage Regulator
RT9164-28
VIN
VOUT
GND
18 -27 Lines
+
+
22 F
µ
10 F
µ
Fig. 2 Active SCSI Bus Terminator
RT9164-33
VIN
VOUT
V
OUT
3.3V
V
= 5V
IN
GND
+
+
C2
10 F
C1
10 F
µ
µ
Tantalum
I
Q
(1) C1 needed if device is far from filter capacitors.
(2) C2 required for stability.
Fig. 3 Fixed Voltage Regulator
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RT9164
Typical Operating Characteristics
Load Regulation
Adjust Pin Current
0
100
90
80
70
60
50
40
30
20
10
0
∆Load = 1A
-0.05
-0.1
-0.15
-0.2
-0.25
-0.3
-0.35
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
°
Temperature ( C)
Temperature ( C)
°
RT9164-ADJ Ripple Rejection
COUT = 20µF Tantalum
ADJ = 22µF Electrolytic
IOUT = 0.5A
Ripple Rejection & Current
0
-20
-20
COUT = 20µF Tantalum
CADJ = 22µF Electrolytic
-30
-40
-50
-60
-70
-80
-90
-100
C
-40
f
= 120Hz
= 20KHz
-60
f
RIPPLE
-80
-100
0
200
400
600
800
Frequency (Hz)
ILOAD (mA)
Short-Circuit Current
Dropout Voltage (VIN-VOUT
)
2.5
2.0
1.5
1.0
0.5
0.0
1.2
TJ = 25°C
1.0
0.8
0.6
0.4
0.2
0.0
TJ = 125°C
TJ = 125°C
TJ = 25°C
0
2.5
5
7.5
10
0
200
400
600
800
Output Current (mA)
Input/Output Differential (V)
DS9164-08 May 2001
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RT9164
Temperature Stability
Temperature Stability (VREF
)
3.4
3.2
3
1.28
1.27
1.26
1.25
1.24
1.23
3.3V
2.8
2.6
2.4
2.2
2.85V
2.5V
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
°
Temperature ( C)
Temperature (°C)
Load Transient Response
R
Load Transient Response
0.3
0.3
VOUT = 2.5V
CIN = 10µF Tantalum
CIN = 10µF Tantalum
VOUT = 2.5V
0.2
0.1
0.2
0.1
C
OUT = 10µF Tantalum
COUT = 10µF Tantalum
VIN = 4V
VIN = 4V
Preload = 0.1A
Preload = 0.1A
>
>
0
-0.1
-0.2
0.5
0
T
T
-0.1
-0.2
1.0
≈
≈
≈
≈
T
T
>
>
0
0
-0.5
-1.0
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)
Load Transient Response
Load Transient Response
0.3
0.3
VOUT = 2.85V
CIN = 10µF Tantalum
CIN = 10µF Tantalum
VOUT = 2.85V
0.2
0.1
0.2
0.1
C
OUT = 10µF Tantalum
COUT = 10µF Tantalum
VIN = 4.35V
VIN = 4.35V
Preload = 0.1A
Preload = 0.1A
>
>
0
-0.1
-0.2
0.5
0
-0.1
-0.2
1.0
T
T
≈
≈
≈
≈
T
T
>
0
>
0
-0.5
-1.0
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)
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RT9164
Load Transient Response
Load Transient Response
0.3
0.3
0.2
0.1
CIN = 10µF Tantalum
CIN = 10µF Tantalum
VOUT = 3.3V
VOUT = 3.3V
0.2
0.1
C
OUT = 10µF Tantalum
C
OUT = 10µF Tantalum
VIN = 4.8V
V
IN = 4.8V
Preload = 0.1A
Preload = 0.1A
>
>
0
-0.1
-0.2
0.5
0
-0.1
-0.2
1.0
T
T
≈
≈
≈
≈
T
T
>
0
>
0
-0.5
-1.0
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
COUT = 10µF Tantalum
OUT = 0.1A
4.5
3.5
I
2.5
T
1.5
VOUT + 0.5
≈
≈
20
0
T
>
>
-20
-40
0
10 20 30 40 50 60 70 80 90 100
Time (µS)
DS9164-08 May 2001
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RT9164
Application Information
Output voltage adjustment
Like most regulators, the RT9164 regulates the
output by comparing the output voltage to an
internally generated reference voltage. On the
adjustable version as shown in Fig.4, the V
available externally as 1.25V between V
ADJ. The voltage ratio formed by R1 and R2 should
be set to conduct 10mA (minumum output load).
The output voltage is given by the following
equation:
200Ω. For example, with R1 = 124Ω and f
=
RIPPLE
120Hz, the C
should be > 11µF.
ADJ
Output Capacitor
RT9164 requires a capacitor from V
is
and
REF
to GND to
OUT
OUT
provide compensation feedback to the internal gain
stage. This is to ensure stability at the output
terminal. Typically,
a 10µF tantalum or 50µF
aluminum electrolytic is sufficient.
Note: It is important that the ESR for this capacitor
does not exceed 0.5Ω.
R1
R2
V
OUT
= V
(1+
) + I
× R
ADJ 2
REF
On fixed versions of RT9164, the voltage divider is
provided internally.
The output capacitor does not have a theoretical
upper limit and increasing its value will increase
stability. C
= 100µF or more is typical for high
OUT
current regulator design.
RT9164
V
V
OUT
VIN
IN
VOUT
ADJ
Load Regulation
R1
R2
V
REF
When the adjustable regulator is used (Fig.5), the
best load regulation is accomplished when the top of
the resistor divider (R1) is connected directly to the
+
+
I
10 F
10 F
µ
µ
ADJ
65µA
+
C
ADJ
output pin of the RT9164. When so connected, R is
P
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.
Fig. 4 Basic Adjustable Regulator
Input Bypass Capacitor
An input capacitor is recommended. A 10µF tantalum
on the input is a suitable input bypassing for almost
all applications.
R
Parasitic
P
RT9164
VIN VOUT
GND
Line Resistance
V
IN
R1
Adjust Terminal Bypass Capacitor
The adjust terminal can be bypassed to ground with
(Connect R1
to case R2)
R
L
a bypass capacitor (C
) to improve ripple rejection.
ADJ
R
2
This bypass capacitor prevents ripple from being
amplified as the output voltage is increased. At any
ripple frequency, the impedance of the C
should
Connect R2 to load
ADJ
be less than R1 to prevent the ripple from being
amplified:
Fig. 5 Best Load Regulation Using Adjustable Output
Regulator
(2π * f
* C
) < R1
ADJ
RIPPLE
Thermal Protection
The R1 is the resistor between the output and the
adjust pin. Its value is normally in the range of 100-
RT9164 has thermal protection which limits junction
temperature to 150°C. However, device functionality
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DS9164-08 May 2001
8
RT9164
is only guaranteed to
a
maximum junction
temperature of +125°C. The power dissipation and
junction temperature for RT9164 in DPAK package
are given by
P = (V - V
) × I
OUT
D
OUT
IN
T
= T
+ (P × θ )
AMBIENT D JA
JUNCTION
Note: T
must not exceed 125°C
JUNCTION
Current Limit Protection
RT9164 is protected against overload conditions.
Current protection is triggered at typically 1.6A.
Thermal Consideration
The RT9164 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.
DS9164-08 May 2001
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RT9164
Package Information
D
D1
B
C
L
e
e
H
A
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
--
Max
1.803
0.787
3.708
7.290
6.706
3.150
2.362
0.330
--
Min
--
Max
0.071
0.031
0.146
0.287
0.264
0.124
0.093
0.013
--
A
b
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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DS9164-08 May 2001
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RT9164
A
D
C
B
D1
E
L1
L3
e
b1
L2
b
b2
U
V
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
2.388
2.032
0.889
Min
0.086
0.035
Max
0.094
0.080
A
B
2.184
0.889
0.508
b
0.020
0.035
b1
b2
C
1.016 Ref.
0.040 Ref.
0.457
0.457
6.350
5.207
5.334
2.108
9.398
0.508
0.635
0.584
0.584
6.731
5.461
6.223
2.438
0.018
0.018
0.250
0.205
0.210
0.023
0.023
0.265
0.215
0.245
D
D1
E
e
0.083
0.370
0.020
0.025
0.096
0.410
--
L1
L2
L3
U
10.414
--
0.040
1.016
3.810 Ref.
3.048 Ref.
0.150 Ref.
0.120 Ref.
V
3-Lead TO-252 Plastic Surface Mount Package
DS9164-08 May 2001
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11
RT9164
RICHTEK TECHNOLOGY CORP.
Headquarter
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
6F, No. 35, Hsintai Road, Chupei City
4F-1, No. 127, 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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DS9164-08 May 2001
12
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