View RT9176-33GG_4116891.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

RT9176
1.5A Fixed and Adjustable Low Dropout Positive Voltage Regulators
General Description
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.
Features
Low Dropout Performance, 1.5V Max. Full Current Rating Over Line and Temperature Fast Transient Response 2% Output Voltage Accuracy 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, and 3.5V Fixed and 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
RT9176Package Type G : SOT-223 L: TO-252 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 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
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.
3 2 1
TO-252
VIN VOUT (TAB) ADJ/GND
TO-263
DS9176-11 March 2007
www.richtek.com 1
RT9176
Typical Application Circuit
RT9176 VIN = 5V + C1 10uF VIN ADJ VOUT VREF IADJ R1 133 1% R2 232 1% + VOUT = 3.45V
C2 10uF
Tantalum
V OUT = V REF (1+ (1) C1 needed if device is far from filter capacitors. (2) C2 required for stability.
R2 R1
) + I ADJ R 2
Figure 1. Adjustable Voltage Regulator
VIN = 5V +
GND
+
VIN
RT9176-33 VOUT GND +
VOUT 3.3V C2 10uF Tantalum
C1 10uF IQ
(1) C1 needed if device is far from filter capacitors. (2) C2 required for stability.
Figure 2. Active SCSI Bus Terminator
RT9176-28 VIN VOUT
18 - 27 Lines
+
10uF IQ
22uF
Figure 3. Fixed Voltage Regulator
www.richtek.com 2
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 VIN Pin Function Adjust Output Voltage or GND Output Voltage Power Input
DS9176-11 March 2007
www.richtek.com 3
RT9176
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) ------------------------------------------------------------------------------------------ 8kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 750V
Recommended Operating Conditions
(Note 3)
Supply Input Voltage -------------------------------------------------------------------------------------------------- 3V to 12V Junction Temperature Range ---------------------------------------------------------------------------------------- -40C to 125C
Electrical Characteristics
(TA = 25C, unless otherwise specified)
Parameter
Symbol
Test Conditions IOUT = 10mA, (VIN-VOUT) = 2V,
Min
Typ
Max
Units V V
Reference Voltage (Note 4)
RT9176
VREF
TA = 25C 10mA < IOUT < 1.5A, 1.5V < VIN-VOUT < 10V IOUT = 10mA, VIN = 3.3V, TJ = 25C 0 < IOUT < 1.5A, 3.3V < VIN < 10V IOUT = 10mA, VIN = 3.3V, TJ = 25C 0 < IOUT < 1.5A, 3.3V < VIN < 10V IOUT = 10mA, VIN = 4.0V, TJ = 25C 0 < IOUT < 1.5A, 4.0V < VIN < 10V IOUT= 10mA, VIN= 4.25V, TJ = 25C 0 < IOUT < 1.5A, 4.25V < VIN < 10V 0 < IOUT< 1.5A, 4.75V < VIN < 10V IOUT = 10mA, VIN= 5V, TJ = 25C 0 < IOUT < 1.5A, 5.0V < VIN < 10V
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
RT9176-15 RT9176-18 RT9176-25 Output Voltage (Note 4) RT9176-28 RT9176-33 RT9176-35
www.richtek.com 4
1.797 1.815 1.779 1.815
2.460 2.500 2.544 2.450 2.500 2.550 2.822 2.850 2.910 2.793 2.850 2.936 3.234 3.300 3.400 3.465 3.500 3.570 3.430 3.500 3.605
DS9176-11 March 2007
VOUT
V
IOUT = 10mA, VIN = 4.75V, TJ = 25C 3.267 3.300 3.365
RT9176
Parameter RT9176 RT9176-15 Line Regulation (Note 4) RT9176-18 RT9176-25 RT9176-28 RT9176-33 RT9176-35 RT9176 RT9176-15 Load Regulation (Note 4) RT9176-18 RT9176-25 RT9176-28 RT9176-33 RT9176-35 Dropout Voltage Current Limit Minimum Load Current RT9176 Quiescent Current Ripple Rejection Adjust Pin Current Adjust Pin Current Change RT9176-XX IQ PSRR IADJ IADJ 10mA IOUT 1.5A, VIN = 5V (Note 5) VDROP ILIM VLOAD VLINE Symbol Test Conditions IOUT = 10mA, 1.5V VIN-V OUT 10V I OUT = 0mA, 3.3V VIN 15V I OUT = 0mA, 3.3V VIN 15V I OUT = 0mA, 4.0V VIN 15V I OUT = 0mA, 4.25V VIN 15V I OUT = 0mA, 4.75V VIN 15V I OUT = 0mA, 5.0V VIN 15V (VIN-VOUT) = 3V, 0mA I OUT 1.5A VIN = 3.3V, 0 I OUT 1.5A VIN = 3.3V, 0 I OUT 1.5A VIN = 4.0V, 0 I OUT 1.5A VIN = 4.25V, 0 I OUT 1.5A VIN = 4.75V, 0 I OUT 1.5A VIN = 5.0V, 0 I OUT 1.5A I OUT = 500mA I OUT = 1.5A VIN = 5V (VIN-VOUT) = 2V VIN = 5V fRIPPLE = 120Hz , (VIN - VOUT) = 2V, VRIPPLE = 1VP-P Min Typ Max Units ----------------1.5 -----0.1 1 1 1 1 1 1 0.2 1 1 1 1 1 1 1.3 1.75 5 5 72 65 0.2 0.3 6 6 6 6 6 6 0.4 10 10 10 10 12 15 1.5 -10 10 -120 5 % mV mV mV mV mV mV % mV mV mV mV mV mV V V A mA mA dB A A
1.15 1.25
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 pad size is 6mm2 on SOT-223 packages, 100mm2 on TO-252 packages, 125mm2 on TO-263 packages.
DS9176-11 March 2007
www.richtek.com 5
RT9176
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
Quiescent Current vs. Temperature
7 6 5 4 3 2 1 0
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)
www.richtek.com 6
Temperature (C)
DS9176-11 March 2007
RT9176
Dropout Voltage vs. Load Current
1.3
Current Limit
3.5 3
VOUT = 2.5V
-40C
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
125C
0.9
0.8 0 0.3 0.6
CIN = 10uF Electrolytic CO = 10uF Tantalum
0.9 1.2 1.5
Time (2.5ms/Div)
Load Current (A)
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)
DS9176-11 March 2007
www.richtek.com 7
RT9176
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)
www.richtek.com 8
DS9176-11 March 2007
RT9176
Application Information
Output voltage adjustment 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). The output voltage is given by the following equation: VOUT = VREF
R2 (1+ R1
Output Capacitor RT9176 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 is sufficient and please takes the notice of output capacitor ESR range (Figure 5). 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 RT9176, the voltage divider is provided internally.
RT9176 VOUT ADJ + 10uF IADJ
65uA
Region of Stable COUT ESR vs. Load Current
VOUT VREF R1 +
VIN
VIN
10
COUT = 100uF COUT = 10uF
Instable
10uF
C OUT ESR ()
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: (2p * fRIPPLE * CADJ) < R1 The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100-200. For example, with R1 = 124 and fRIPPLE = 120Hz, the CADJ should be > 11F. Load Regulation 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.
0.01 0 0.2 0.4 0.6 0.8 1
+ CADJ R2
Stable
0.1
Instable
Load Current (A)
Figure 5
DS9176-11 March 2007
www.richtek.com 9
RT9176
VIN RT9176 VIN VOUT GND RP Parasitic Line Resistance R1 (Connect R1 to VOUT or case) R2 RL
Connect R2 to load
Figure 6. Best Load Regulation Using Adjustable Output Regulator Thermal Protection RT9176 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 RT9176 are given by PD = (VIN - VOUT) x IOUT TJUNCTION = TAMBIENT + (PD x JA) Note: TJUNCTION must not exceed 125C 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.
www.richtek.com 10
DS9176-11 March 2007
RT9176
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
DS9176-11 March 2007
www.richtek.com 11
RT9176
D D1 B T V E L1 S C U R
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
www.richtek.com 12
DS9176-11 March 2007
RT9176
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
DS9176-11 March 2007
www.richtek.com 13

▲Up To Search▲

Price & Availability of RT9176-33GG

	To Download RT9176-33GG Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .