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RT9164A
1A Fixed and Adjustable Low Dropout Positive Voltage Regulators
General Description
The RT9164A series of high performance positive voltage regulators is designed for applications requiring low dropout performance at fully rated current. Additionally, the RT9164A 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 RT9164A series of three terminal regulators offers fixed and adjustable voltage options available in space-saving SOT-223, TO-252, and TO-263 packages.
Features
Low Dropout Performance, 1.4V Max. Full Current Rating Over Line and Temperature Fast Transient Response 2% Output Voltage Accuracy 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 3.5V Fixed Adjustable Output Voltage SOT-223, TO-252, and TO-263 Packages RoHS Compliant and 100% Lead (Pb)-Free
Applications
Active SCSI Termination Low Voltage Microcontrollers Switching Power Supply Post-Regulator
Ordering Information
RT9164APackage Type G : SOT-223 L: TO-252 LR : TO-252 (R-Type) M : TO-263 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage Default : Adjustable 15 : 1.5V 18 : 1.8V 25 : 2.5V 28 : 2.85V 30 : 3.0V 33 : 3.3V 35 : 3.5V
Pin ConFigurations
(TOP VIEW)
3 2 1 VIN VOUT (TAB) ADJ/GND
SOT-223
3 2 1 VIN VOUT (TAB) ADJ/GND
TO-252
3 2 1 VOUT ADJ/GND (TAB) VIN
Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100%matte tin (Sn) plating.
TO-252 (R-Type)
3 2 1
VIN VOUT (TAB) ADJ/GND
TO-263
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RT9164A
Typical Application Circuit
VIN = 5V CIN
+
VIN
RT9164A VOUT ADJ VREF IADJ R1 133 1% R2 232 1%
VOUT = 3.45V
+
10uF
COUT
10uF
Tantalum
R2 VOUT = VREF(1+ )+IADJ R2 R1 (1) CIN needed if device is far from filter capacitors. (2) COUT required for stability.
Figure 1. Adjustable Voltage Regulator
VIN = 5V CIN
+
RT9164A-33 VIN VOUT GND
+
VOUT 3.3V COUT
10uF
IQ
10uF
Tantalum
(1) CIN needed if device is far from filter capacitors. (2) COUT required for stability.
Figure 2. Fixed Voltage Regulator
VIN = 5V CIN 10uF
+
RT9164A-28 VIN VOUT GND COUT
+
18 - 27 Lines
22uF IQ
Figure 3. Active SCSI Bus Terminator
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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 VIN Pin Function Adjust Output or Ground Output Voltage Power Input
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RT9164A
Absolute Maximum Ratings
(Note 1) Supply Input Voltage -------------------------------------------------------------------------------------------------- 15V Power Dissipation, PD @ TA = 25C SOT-223 ----------------------------------------------------------------------------------------------------------------- 0.740W TO-252 ------------------------------------------------------------------------------------------------------------------- 1.471W TO-263 ------------------------------------------------------------------------------------------------------------------- 2.222W Package Thermal Resistance (Note 6) SOT-223, JA ------------------------------------------------------------------------------------------------------------ 135C/W SOT-223, JC ----------------------------------------------------------------------------------------------------------- 19C/W TO-252, JA ------------------------------------------------------------------------------------------------------------- 68 C/W TO-252, JC ------------------------------------------------------------------------------------------------------------- 7.5 C/W TO-263, JA ------------------------------------------------------------------------------------------------------------- 45 C/W TO-263, JC ------------------------------------------------------------------------------------------------------------- 7.8 C/W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260C Junction Temperature ------------------------------------------------------------------------------------------------- 150C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 150C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 8 kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 750V
Recommended Operating Conditions
(Note 3)
Supply Input Voltage -------------------------------------------------------------------------------------------------- 3V to 14V Junction Temperature Range ---------------------------------------------------------------------------------------- -40C to 125C
Electrical Characteristics
(TA = 25C, unless otherwise specified)
Parameter Reference Voltage (Note 4)
Symbol
Test Conditions IOUT = 10mA, (VIN-VOUT) = 2V, TA = 25C 10mA < IOUT < 1.0A, 1.5V < VIN-VOUT < 10V IOUT = 10mA, VIN = 3.3V, TJ = 25C 10mA < IOUT < 1.0A, 3.3V < VIN < 10V IOUT = 10mA, VIN = 3.3V, TJ = 25C IOUT = 10mA, VIN = 4.0V, TJ = 25C 10mA < IOUT < 1.0A, 4.0V < VIN < 10V IOUT= 10mA, VIN= 4.25V, TJ = 25C IOUT= 10mA, VIN= 4.5V, TJ = 25C 10mA < IOUT < 1.0A, 4.5V < VIN < 10V
Min
Typ
Max Units V V
1.243 1.256 1.281 1.231 1.256 1.294 1.485 1.470 1.5 1.5 1.53 1.55 1.85 1.87
RT9164A
VREF
RT9164A -15 RT9164A -18 Output Voltage (Note 4) RT9164A -25 VOUT RT9164A -28 RT9164A -30
1.797 1.815
10mA < IOUT < 1.0A, 3.3V < VIN < 10V 1.779 1.815
2.475 2.500 2.550 2.450 2.500 2.575 2.822 2.850 2.910 2.970 3.000 3.060 2.940 3.000 3.090
V
10mA < IOUT < 1.0A, 4.25V < VIN < 10V 2.793 2.850 2.936
To be continued
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Parameter RT9164A -33 V OUT RT9164A -35 Symbol Test Conditions IOUT = 10mA, VIN = 4.75V, TJ = 25C IOUT = 10mA, VIN= 5V, TJ = 25C Min Typ Max Units 3.267 3.300 3.365 V
Output Voltage (Note 4)
10mA < IOUT < 1.0A, 4.75V < V IN < 10V 3.234 3.300 3.400 3.465 3.500 3.570 10mA < IOUT < 1.0A, 5.0V < V IN < 10V 3.430 3.500 3.605 IOUT = 10mA, 1.5V VIN-V OUT 10V IOUT = 10mA, 3.3V VIN 15V IOUT = 10mA, 3.3V VIN 15V ------------------1.0 ----10mA IOUT 1.0A, V IN = 5V -0.1 1 1 1 1 1 1 1 0.2 1 1 1 1 1 1 1 1.3 1.8 5 5 72 65 0.2 0.3 6 6 6 6 6 6 6 0.4 10 10 10 10 12 12 15 1.4 -10 10 -120 5
RT9164A RT9164A -15 RT9164A -18 Line Regulation (Note 4) RT9164A -25 RT9164A -28 RT9164A -30 RT9164A -33 RT9164A -35 RT9164A RT9164A -15 RT9164A -18 Load Regulation (Note 4) RT9164A -25 RT9164A -28 RT9164A -30 RT9164A -33 RT9164A -35 Dropout Voltage Current Limit Minimum Load Current RT9164A Quiescent Current Ripple Rejection Adjust Pin Current Adjust Pin Current Change RT9164A -XX IQ PSRR IADJ IADJ (Note 5) V DROP ILIM VLOA D VLINE
% mV mV mV mV mV mV mV % mV mV mV mV mV mV mV V V A mA mA dB A A
IOUT = 10mA, 4.0V VIN 15V IOUT = 10mA, 4.25V VIN 15V IOUT = 10mA, 4.5V VIN 15V IOUT = 10mA, 4.75V VIN 15V IOUT = 10mA, 5.0V VIN 15V (V IN -VOUT) = 3V, 10mA I OUT 1.0A V IN = 3.3V, 10mA I OUT 1.0A V IN = 3.3V, 10mA I OUT 1.0A V IN = 4.0V, 10mA I OUT 1.0A V IN = 4.25V, 10mA I OUT 1.0A V IN = 4.5V, 10mA I OUT 1.0A V IN = 4.75V, 10mA I OUT 1.0A V IN = 5.0V, 10mA I OUT 1.0A IOUT = 500mA IOUT = 1.0A V IN = 5V (V IN -VOUT) = 2V V IN = 5V f RIP PLE = 120Hz , (V IN - VOUT) = 2V, VRIP PLE = 1V P-P
1.15 1.25
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RT9164A
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. JA is measured in the natural convection at T A = 25C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. The case point of JC is on the center of the exposed pad. The pad size is 6mm2 on SOT-223 packages, 100mm2 on TO-252 packages, 125mm2 on TO-263 packages.
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Typical Operating Characteristics
Output Voltage vs. Temperature
3.4
1.27
Reference Voltage vs. Temperature
VOUT = 3.3V
3
Reference Voltage (V)
Output Voltage (V)
1.26
2.6
VOUT = 2.5V
2.2
1.25
1.8
VOUT = 1.5V
1.4 -50 -25 0 25
VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL =
1.24
VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum R1 = R2 = 100 RL =
-50 -25 0 25 50 75 100 125
1.23
50
75
100
125
Temperature (C)
Temperature (C)
ADJ Pin Current vs. Temperature
80
7 6 5 4 3 2 1 0
Quiescent Current vs. Temperature
70
Quiescent Current (mA)
ADJ Pin Current (uA)
VOUT = 2.5V
60
50
VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum R1 = R2 = 100 RL =
-50 -25 0 25 50 75 100 125
40
VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL =
-50 -25 0
Temperature (C)
Temperature(C)
25
50
75
100
125
Current Limit vs. Input Voltage
3 2.5 2
Current Limit vs. Temperature
1.9
Current Limit (A)
2 1.5 1 0.5 0 2 4 6 8
Current Limit (A)1
VOUT = 2.5V, RL = 1
1.8
VOUT = 2.5V, RL = 1
1.7
1.6
CIN = 10uF Electrolytic CO = 10uF Tantalum
10 12 14
1.5 -50 -25 0 25
VIN = 5V CIN = 10uF Electrolytic CO = 10uF Tantalum
50 75 100 125
Input Voltage (V)
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Temperature (C)
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RT9164A
Dropout Voltage vs. Io
1.3
Current Limit
3.5 -40C 3
VOUT = 2.5V
Dropout Voltage (V)1
1.2
25C
1.1
Current Limit (A)
2.5 2 1.5 1 0.5 0 VIN = 5V, VOUT = 2.5V CIN = 10uF Electrolytic CO = 10uF Tantalum RL = 1
1.0
0.9
125C CIN = 10uF Electrolytic CO = 10uF Tantalum
0 0.3 0.6 0.9 1.2 1.5
0.8
Load Current (A)
Time (2.5ms/Div)
Line Transient Response
Output Voltage Deviation (mV)
20 10 0 -10
Line Transient Response
Output Voltage Deviation (mV)
40 30 20 0 -20 VOUT = 2.5V CO = 10uF Tantalum ILOAD = 100mA
30
VOUT = 1.5V CO = 10uF Tantalum ILOAD = 100mA
Input Voltage Deviation (V)
Input Voltage Deviation (V)
7 6 5
7 6 5
Time (10us/Div)
Time (10us/Div)
Line Transient Response
Output Voltage Deviation (mV)
30 20 0 -20 7 6 5
Load Transient Response
Output Voltage Deviation (mV)
300 200 100 0 -100 VIN = 3.3V, VOUT = 1.5V CIN = CO = 10uF Tantalum Preload = 0.1A
40
VOUT = 3.3V CO = 10uF Tantalum ILOAD = 100mA
Load Current (A)
Input Voltage Deviation (V)
1 0.5 0
Time (10us/Div)
Time (10us/Div)
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Load Transient Response
Output Voltage Deviation (mV) Output Voltage Deviation (mV)
300 200 100 0 -100 VIN = 3.3V, VOUT = 1.5V CIN = CO = 10uF Tantalum Preload = 0.1A 300 200 100 0 -100
Load Transient Response
VIN = 5V, VOUT = 2.5V CIN = CO = 10uF Tantalum Preload = 0.1A
Load Current (A)
Load Current (A)
2 1 0
1 0.5 0
Time (10us/Div)
Time (10us/Div)
Load Transient Response
Output Voltage Deviation (mV)
300 200 100 0 -100
Load Transient Response
300
Output Voltage Deviation (mV) Load Current (A)
VIN = 5V, VOUT = 2.5V CIN = CO = 10uF Tantalum Preload = 0.1A
VIN = 5V, VOUT = 3.3V VIN = 5V, VOUT = 3.3V 200 CIN = CO = 10uF Tantalum CIN = CO = 10uF Tantalum Preload = 0.1A Preload = 0.1A 100 0 -100 1 0.5 0
Load Current (A)
2 1 0
Time (10us/Div)
Time (10us/Div)
Load Transient Response
Output Voltage Deviation (mV)
300 200 100 0 -100 VIN = 5V, VOUT = 3.3V CIN = CO = 10uF Tantalum Preload = 0.1A
Load Current (A)
2 1 0
Time (10us/Div)
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RT9164A
Application Information
Output voltage adjustment Like most regulators, the RT9164A 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). The output voltage is given by the following equation: VOUT = VREF (1+
R2 R1
Output Capacitor RT9164A requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, 10F tantalum or 50F aluminum electrolytic with 30m to 2 range capacitor is sufficient. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100F or more is typical for high current regulator design.
) + IADJ R2
On fixed versions of RT9164A, the voltage divider is provided internally.
Region of Stable COUT ESR vs. Load Current
10
VIN CIN 10uF
+
RT9164A VIN VOUT ADJ IADJ
65uF
COUT = 100uF
VOUT
Instable
10uF
+
C OUT ESR ()
VREF
R1
COUT
1
COUT = 10uF Stable
+
CADJ
R2
0.1
Figure 4. Basic Adjustable Regulator Input Bypass Capacitor An input capacitor is recommended. A 10F tantalum on the input is a suitable input bypassing for almost all applications. Adjust Terminal Bypass Capacitor 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: (2 x fRIPPLE x CADJ) < R1 The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100-200. For example, with R1 = 124 and fRIPPLE = 120Hz, the CADJ should be > 11F. Load Regulation
0.01 0 0.2 0.4
Instable
0.6 0.8 1
Load Current (A)
Figure 5
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 RT9164A. 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.
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RT9164A
VIN RT9164A VIN VOUT ADJ RP Parasitic Line Resistance R1 (Connect R1 to VOUT or case) RL R2
Connect R2 to load
Figure 6. Best Load Regulation Using Adjustable Output Regulator Thermal Protection RT9164A has thermal protection which limits junction temperature to 150C. However, device functionality is only guaranteed to a maximum junction temperature of +125C. The power dissipation and junction temperature for RT9164A are given by PD = (VIN - VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x JA) Note: TJUNCTION must not exceed 125C Current Limit Protection RT9164A is protected against overload conditions. Current protection is triggered at typically 1.8A. Thermal Consideration The RT9164A 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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RT9164A
Outline Dimension
D D1
H
C
B
L e e
L1
A b
A1
Symbol A A1 b B C D D1 e H L L1
Dimensions In Millimeters Min 1.450 0.020 0.610 3.302 6.706 6.299 2.896 2.261 0.229 1.550 0.800 Max 1.803 0.100 0.787 3.708 7.290 6.706 3.150 2.362 0.330 1.950 1.100
Dimensions In Inches Min 0.057 0.0008 0.024 0.130 0.264 0.248 0.114 0.089 0.009 0.061 0.009 Max 0.071 0.0047 0.031 0.146 0.287 0.264 0.124 0.093 0.013 0.077 0.013
3-Lead SOT-223 Surface Mount Package
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D D1 B T V E L1 S U R
C
L3 b1 b e b2 L2
A
Symbol A B b b1 b2 C D D1 E e L1 L2 L3 U V R S T
Dimensions In Millimeters Min 2.184 0.889 0.508 0.457 0.457 6.350 5.207 5.334 2.108 9.398 0.635 Max 2.388 2.032 0.889 0.584 0.584 6.731 5.461 6.223 2.438 10.414 1.016
Dimensions In Inches Min 0.086 0.035 0.020 0.018 0.018 0.250 0.205 0.210 0.083 0.370 0.025 Max 0.094 0.080 0.035 0.023 0.023 0.265 0.215 0.245 0.096 0.410 0.040
1.016 Ref.
0.040 Ref.
0.508 Ref. 3.810 Ref. 3.048 Ref. 0.200 2.500 0.500 0.850 3.400 0.850
0.020 Ref.
0.150 Ref. 0.120 Ref. 0.008 0.098 0.020 0.033 0.134 0.033
3-Lead TO-252 Surface Mount Package
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RT9164A
D B C U
V E L1
b1 L2 e b b2
A
Symbol A B b b1 b2 C D E e L1 L2 U V
Dimensions In Millimeters 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
Dimensions In Inches Min 0.160 0.045 0.026 0.045 0.012 0.045 0.380 0.320 0.090 0.575 0.090 Max 0.190 0.066 0.036 0.055 0.023 0.055 0.420 0.380 0.110 0.625 0.110
6.223 Ref. 7.620 Ref.
0.245 Ref. 0.300 Ref.
3-Lead TO- 263 Surface Mount Package
Richtek Technology Corporation
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 8F, 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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