LT1521CS8-3

LT1521CS8-3-PBF LINEAR_DIMENSIONS | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 16

Technical content

LT1521-3.3/LT1521-5 1521335fb The LT 1521/LT1521-3/LT1521-3.3/LT1521-5 are low dropout regulators with micropower quiescent current and shutdown. These devices are capable of supplying 300mA of output current with a dropout voltage of 0.5V. Designed for use in battery-powered systems, the low quiescent current, 12 mA operating and 6 mA in shutdown, makes them an ideal choice. The quiescent current is well controlled; it does not rise in dropout as it does with many other low dropout PNP regulators. Other features of the LT1521/LT1521-3/LT1521-3.3/ LT1521-5 include the ability to operate with very small output capacitors. They are stable with only 1.5mF on the output while most older devices require between 10mF and 100mF for stability. Small ceramic capacitors can be used, enhancing manufacturability. Also, the input may be con- nected to voltages lower than the output voltage, including negative voltages, without reverse current flow from out- put to input. This makes the LT1521 series ideal for backup power situations where the output is held high and the input is low or reversed. Under these conditions only 5mA will flow from the output pin to ground. 300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown 5V Battery-Powered Supply with Shutdown Dropout Voltage n Dropout Voltage: 0.5V n Output Current: 300mA n Quiescent Current: 12mA n No Protection Diodes Needed n Adjustable Output from 3.8V to 20V n Fixed Output Voltages: 3V, 3.3V, 5V n Controlled Quiescent Current in Dropout n Shutdown IQ = 6mA n Reverse Battery Protection n No Reverse Current n Thermal Limiting OUTPUT CURRENT (mA) DROPOUT VOLTAGE (V) 0.1 0.2 0.3 0.4 0.6 50 100 150 200 LT1521 • TA02 250 300 0.5 6V 1.5 µF1µF 300mA VSHDN (PIN 5) OUTPUT <0.25 OFF >2.80 ON NC ON LT1521-5 GND IN SHDN OUT SENSE LT1521 • TA01 , LTC and LT are registered trademarks of Linear Technology Corporation. n Low Current Regulator n Regulator for Battery-Powered Systems n Post Regulator for Switching Supplies APPLICATIO SU

FEATURES

LT1521-3.3/LT1521-5 1521335fb ABSOLUTE MAXIMUM RATINGSW WW U PACKAGE/ORDER INFORMATIONW UU FRONT VIEW TAB IS GND OUT GND IN ST PACKAGE 3-LEAD PLASTIC SOT-223 TJMAX = 125°C, qJA = 50°C/ W SEE THE APPLICATIONS INFORMATION SECTION ORDER PART NUMBER ORDER PART NUMBER TOP VIEW IN GND GND SHDN OUT SENSE/ADJ* GND NC S8 PACKAGE 8-LEAD PLASTIC SO *PIN 2 = SENSE FOR LT1521-3/LT1521-3.3/LT1521-5 = ADJ FOR LT1521 TJMAX = 125°C, qJA = 70°C/ W SEE THE APPLICATIONS INFORMATION SECTION ORDER PART NUMBER TJMAX = 125°C, qJA = 125°C/ W OUT SENSE/ADJ* NC GND IN NC NC SHDN TOP VIEW MS8 PACKAGE 8-LEAD PLASTIC MSOP *PIN 2 = SENSE FOR LT1521-3/ LT1521-3.3/LT1521-5 PIN 2 = ADJ FOR LT1521 Operating Junction Temperature Range (Note 2) *For applications requiring input voltage ratings greater than 20V, contact the factory. LT1521CMS8 LT1521CMS8-3 LT1521CMS8-3.3 LT1521CMS8-5 LT1521CS8 LT1521CS8-3 LT1521CS8-3.3 LT1521CS8-5 LT1521IS8 LT1521IS8-3 LT1521IS8-3.3 LT1521IS8-5 LT1521CST-3 LT1521CST-3.3 LT1521CST-5 LT1521IST-3 LT1521IST-3.3 LT1521IST-5 S8 PART MARKING ST PART MARKINGMS8 PART MARKING 1521 15213 152133 15215 LTEZ LTFB LTDU LTFA 1521I 1521I3 1521I33 1521I5 1521I3 1521I33 1521I5 15213 152133 15215 (Note 1) Consult LTC Marketing for parts specified with wider operating temperature ranges.

LT1521-3.3/LT1521-5 1521335fb PARAMETER CONDITIONS MIN TYP MAX UNITS Regulated Output Voltage LT1521-3 V IN = 3.5V, IOUT = 1mA, TJ = 25°C 2.950 3.000 3.050 V (Note 4) 4V < V IN < 20V, 1mA < IOUT < 300mA l 2.900 3.000 3.100 V 4.3V < VIN < 20V, 1mA < IOUT < 300mA l 3.200 3.300 3.400 V LT1521-5 V IN = 5.5V, IOUT = 1mA, TJ = 25°C 4.925 5.000 5.075 V 6V < VIN < 20V, 1mA < IOUT < 300mA l 4.850 5.000 5.150 V LT1521 (Note 5) V IN = 4.3V, IOUT = 1mA, TJ = 25°C 3.695 3.750 3.805 V 4.8V < VIN < 20V, 1mA < IOUT < 300mA l 3.640 3.750 3.860 V Line Regulation LT1521-3 DVIN = 4.5 to 20V, IOUT = 1mA l 1.5 20 mV LT1521-3.3 DVIN = 4.8 to 20V, IOUT = 1mA l 1.5 20 mV LT1521-5 DVIN = 5.5 to 20V, IOUT = 1mA l 1.5 20 mV LT1521 (Note 5) DVIN = 4.3 to 20V, IOUT = 1mA l 1.5 20 mV Load Regulation LT1521-3 DILOAD = 1mA to 300mA, TJ £ 25°C– 2 0 – 3 0 m V LT1521-3.3 DILOAD = 1mA to 300mA, TJ £ 25°C– 2 0 – 3 0 m V LT1521-5 DILOAD = 1mA to 300mA, TJ £ 25°C– 2 5 – 4 5 m V LT1521 (Note 5) DILOAD = 1mA to 300mA, TJ £ 25°C– 2 0 – 3 0 m V LT1521-3 DILOAD = 1mA to 300mA, TJ >25°C– 2 0 – 5 5 m V LT1521-3.3 DILOAD = 1mA to 300mA, TJ > 25°C– 2 0 – 5 5 m V LT1521-5 DILOAD = 1mA to 300mA, TJ > 25°C– 2 5 – 7 5 m V LT1521 (Note 5) DILOAD = 1mA to 300mA, TJ > 25°C– 2 0 – 5 5 m V Dropout Voltage (Note 6) I LOAD = 1mA, TJ = 25°C 130 170 mV ILOAD = 1mA l 250 mV ILOAD = 50mA, TJ = 25°C 290 350 mV ILOAD = 50mA l 450 mV ILOAD = 100mA, TJ = 25°C 350 420 mV ILOAD = 100mA l 550 mV ILOAD = 150mA, TJ = 25°C 400 470 mV ILOAD = 150mA l 600 mV ILOAD = 300mA, TJ = 25°C 500 600 mV ILOAD = 300mA l 750 mV Ground Pin Current (Note 7) I LOAD = 0mA l 12 25 mA ILOAD = 1mA l 65 100 mA ILOAD = 10mA l 300 450 mA ILOAD = 50mA l 0.8 1.5 mA ILOAD = 100mA l 1.4 2.5 mA ILOAD = 150mA l 2.2 4.0 mA ILOAD = 300mA l 6.5 12.0 mA Adjust Pin Bias Current (Notes 5, 8) T J = 25°C 50 100 nA Shutdown Threshold V OUT = Off to On l 1.20 2.80 V VOUT = On to Off l 0.25 0.75 V Shutdown Pin Current (Note 9) V SHDN = 0V l 2.0 5.0 mA Quiescent Current in Shutdown (Note 10) V IN = VOUT (NOMINAL) + 1V, VSHDN = 0V l 61 2 mA Ripple Rejection V IN – VOUT = 1V(Avg), VRIPPLE = 0.5VP–P,5 0 5 8 d B fRIPPLE = 120Hz, ILOAD = 150mA Current Limit V IN – VOUT = 7V, TJ = 25°C 400 800 mA VIN = VOUT (NOMINAL) + 1.5V, DVOUT = – 0.1V l 320 400 mA ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

LT1521-3.3/LT1521-5 1521335fb

ELECTRICAL CHARACTERISTICS

TEMPERATURE (°C) –50 DROPOUT VOLTAGE (V) 0.7 LT1521 • TPC02 0.4 0.2 –25 0 50 0.1 0.8 0.6 0.5 0.3 75 100 125 ILOAD = 1mA ILOAD = 50mA ILOAD = 150mA ILOAD = 300mA ILOAD = 100mA TEMPERATURE (°C) –50 QUIESCENT CURRENT (µA) 15.0 12.5 10.0 7.5 5.0 2.5 25 75 LT1521 • TPC03 –25 0 50 100 125 VIN = 6V RL = ¥ ILOAD = 0 VSHDN = OPEN VSHDN = 0V Quiescent CurrentGuaranteed Dropout Voltage OUTPUT CURRENT (mA) DROPOUT VOLTAGE (V) 150 250 LT1521 • TPC01 50 100 200 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 300 TJ ≤ 125°C TJ ≤ 25°C = TEST POINTS Dropout Voltage TYPICAL PERFORMANCE CHARACTERISTICS UW PARAMETER CONDITIONS MIN TYP MAX UNITS Input Reverse Leakage Current V IN = – 20V, VOUT = 0V l 1.0 mA Reverse Output Current (Note 11) LT1521-3 V OUT = 3V, VIN < 3V, TJ = 25°C5 1 0 mA LT1521-3.3 V OUT = 3.3V, VIN < 3.3V, TJ = 25°C5 1 0 mA LT1521-5 V OUT = 5V, VIN < 5V, TJ = 25°C5 1 0 mA LT1521 (Note 5) V OUT = 3.8V, VIN < 3.75V, TJ = 25°C5 1 0 mA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The shutdown pin input voltage rating is required for a low impedance source. Internal protection devices connected to the shutdown pin will turn on and clamp the pin to approximately 7V or –0.6V. This range allows the use of 5V logic devices to drive the pin directly. For high impedance sources or logic running on supply voltages greater than 5.5V, the maximum current driven into the shutdown pin must be limited to less than 5mA. Note 3: For junction temperatures greater than 110°C, a minimum load of 1mA is recommended. For T J > 110°C and IOUT < 1mA, output voltage may increase by 1%. Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited. Note 5: The LT1521 (adjustable version) is tested and specified with the adjust pin connected to the output pin. Note 6: Dropout voltage is the minimum input/output voltage required to maintain regulation at the specified output current. In dropout the output voltage will be equal to: (V IN – VDROPOUT) Note 7: Ground pin current is tested with VIN = VOUT (nominal) and a current source load. This means the device is tested while operating in its dropout region. This is the worst-case ground pin current. The ground pin current will decrease slightly at higher input voltages. Note 8: Adjust pin bias current flows into the adjust pin. Note 9: Shutdown pin current at V SHDN = 0V flows out of the shutdown pin. Note 10: Quiescent current in shutdown is equal to the total sum of the shutdown pin current (2mA) and the ground pin current (4mA). Note 11: Reverse output current is tested with the input pin grounded and the output pin forced to the rated output voltage. This current flows into the output pin and out of the ground pin. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

LT1521-3.3/LT1521-5 1521335fb TYPICAL PERFORMANCE CHARACTERISTICS UW LT1521-3 Quiescent Current INPUT VOLTAGE (V) QUIESCENT CURRENT (µA) LT1521 • TPC08 213579 4 6 10 TJ = 25°C RL = ¥ VSHDN = OPEN VSHDN = 0V INPUT VOLTAGE (V) QUIESCENT CURRENT (µA) LT1521 • TPC09 213579 4 6 10 TJ = 25°C RL = ¥ LT1521-3.3 Quiescent Current INPUT VOLTAGE (V) QUIESCENT CURRENT (µA) LT1521 • TPC11 213579 4 6 10 TJ = 25°C RL = ¥ VSHDN = OPEN VSHDN = 0V LT1521-3 Ground Pin Current INPUT VOLTAGE (V) GROUND PIN CURRENT (µA) 1000 900 800 700 600 500 400 300 200 100 LT1521 • TPC12 213579 4 6 10 TJ = 25°C *FOR VOUT = 3V RLOAD = 3k ILOAD = 1mA* RLOAD = 300Ω ILOAD = 10mA* RLOAD = 120Ω ILOAD = 25mA* RLOAD = 60Ω ILOAD = 50mA* LT1521 Quiescent Current LT1521-3 Output Voltage LT1521-3.3 Output Voltage LT1521-5 Output Voltage TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) LT1521 • TPC04 –25 0 50 3.08 3.06 3.04 3.02 3.00 2.98 2.96 2.94 2.92 75 100 125 TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) LT1521 • TPC05 –25 0 50 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 75 100 125 IOUT = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) LT1521 • TPC06 –25 0 50 5.08 5.06 5.04 5.02 5.00 4.98 4.96 4.94 4.92 75 100 125 LT1521 Adjust Pin Voltage TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 3.81 LT1521 • TPC07 3.75 3.71 –25 0 50 3.69 3.67 3.83 3.79 3.77 3.73 75 100 125 ILOAD = 1mA LT1521-5 Quiescent Current INPUT VOLTAGE (V) QUIESCENT CURRENT (µA) LT1521 • TPC10 213579 4 6 10 TJ = 25°C RL = ¥ VSHDN = OPEN VSHDN = 0V

LT1521-3.3/LT1521-5 1521335fb TYPICAL PERFORMANCE CHARACTERISTICS UW INPUT VOLTAGE (V) GROUND PIN CURRENT (µA) 1000 900 800 700 600 500 400 300 200 100 LT1521 • TPC18 213579 4 6 10 TJ = 25°C RLOAD = 75Ω ILOAD = 50mA* RLOAD = 150Ω ILOAD = 25mA* RLOAD = 375Ω ILOAD = 10mA* RLOAD = 3.8k ILOAD = 1mA* VOUT = VADJ *FOR VOUT = 3.75V INPUT VOLTAGE (V) GROUND PIN CURRENT (µA) 1000 900 800 700 600 500 400 300 200 100 0 8 LT1521 • TPC16 213579 4 6 10 TJ = 25°C *FOR VOUT = 5V RLOAD = 100Ω ILOAD = 50mA* RLOAD = 200Ω ILOAD = 25mA* RLOAD = 500Ω ILOAD = 10mA* RLOAD = 5k ILOAD = 1mA* LT1521-5 Ground Pin Current INPUT VOLTAGE (V) GROUND PIN CURRENT (mA) LT1521 • TPC17 2 4 6 1071 3 5 9 TJ = 25°C *FOR VOUT = 5V RLOAD = 16.7Ω ILOAD = 300mA* RLOAD = 33.3Ω ILOAD = 150mA* RLOAD = 50Ω ILOAD = 100mA* LT1521-5 Ground Pin Current LT1521 Ground Pin Current LT1521 Ground Pin Current INPUT VOLTAGE (V) GROUND PIN CURRENT (mA) LT1521 • TPC19 2 4 6 1071 3 5 9 TJ = 25°C VOUT = VADJ *FOR VOUT = 3.75V RLOAD = 12.5Ω ILOAD =300mA* RLOAD = 25Ω ILOAD =150mA* RLOAD = 37.5Ω ILOAD =100mA* Ground Pin Current Shutdown Pin Threshold (On-to-Off) TEMPERATURE (°C) –50 SHUTDOWN PIN THRESHOLD (V) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 50 75 LT1521 • TPC21 –25 25 100 125 ILOAD = 1mA OUTPUT CURRENT (mA) GROUND PIN CURRENT (mA)2 50 100 150 200 LT1521 • TPC20 250 300 VIN = 3V (LT1521-3) VIN = 3.3V (LT1521-3.3) VIN = 5V (LT1521-5) VIN = 3.75V (LT1521) DEVICE IS OPERATING IN DROPOUT TJ = 125°C TJ = 55°C TJ = 25°C INPUT VOLTAGE (V) GROUND PIN CURRENT (mA) LT1521 • TPC13 2 4 6 1071 3 5 9 TJ = 25°C *FOR VOUT = 3V RLOAD = 10Ω ILOAD = 300mA* RLOAD = 20Ω ILOAD = 150mA* RLOAD = 30Ω ILOAD = 100mA* INPUT VOLTAGE (V) GROUND PIN CURRENT (µA) 600 800 1000 900 700 500 300 100 LT1521 • TPC14 400 200 213579 4 6 10 TJ = 25°C *FOR VOUT = 3.3V RLOAD = 66Ω ILOAD = 50mA* RLOAD = 132Ω ILOAD = 25mA* RLOAD = 330Ω ILOAD = 10mA* RLOAD = 3.3k ILOAD = 1mA* INPUT VOLTAGE (V) GROUND PIN CURRENT (mA) LT1521 • TPC15 2 4 6 1071 3 5 9 RLOAD = 11Ω ILOAD = 300mA* RLOAD = 22Ω ILOAD = 150mA* RLOAD = 33Ω ILOAD = 100mA* TJ = 25°C *FOR VOUT = 3.3V LT1521-3.3 Ground Pin Current LT1521-3.3 Ground Pin Current LT1521-3 Ground Pin Current

LT1521-3.3/LT1521-5 1521335fb TYPICAL PERFORMANCE CHARACTERISTICS UW Current Limit TEMPERATURE (°C) –50 SHORT-CIRCUIT CURRENT (A) 0.6 0.5 0.4 0.3 0.2 0.1 25 75 LT1521 • TPC28 –25 0 50 100 125 VIN = 7V VOUT = 0V Current Limit Adjust Pin Bias Current TEMPERATURE (°C) –50 ADJUST PIN BIAS CURRENT (nA) LT1521 • TPC25 –25 0 50 200 175 150 125 100 75 100 125 Reverse Output Current OUTPUT VOLTAGE (V) REVERSE OUTPUT CURRENT (µA) LT1521 • TPC26 35794 6 10 TJ = 25°C VIN = 0V CURRENT FLOWS INTO OUTPUT PIN V OUT = VSENSE (LT1521-3/LT1521-3.3 LT1521-5) V OUT = VADJ (LT1521) LT1521 LT1521-3.3 LT1521-3 LT1521-5 TEMPERATURE (°C) –50 OUTPUT PIN CURRENT (µA) LT1521 • TPC29 –25 0 50 75 100 125 VIN = 0V VOUT = 3V (LT1521-3) VOUT = 3.3V (LT1521-3.3) VOUT = 5V (LT1521-5) VOUT = 3.75V (LT1521) Reverse Output Current Ripple Rejection TEMPERATURE (°C) –50 25 75 LT1521 • TPC30 –25 0 50 100 125 RIPPLE REJECITON (dB) VIN = VOUT (NOMINAL) + 1V + 0.5VP-P RIPPLE AT f = 120Hz ILOAD = 150mA INPUT VOLTAGE (V) SHORT-CIRCUIT CURRENT (A) 0.6 0.5 0.4 0.3 0.2 0.1 LT1521 • TPC27 12 46 7 VOUT = 0V Shutdown Pin Threshold (Off-to-On) TEMPERATURE (°C) –50 SHUTDOWN PIN CURRENT (µA) 3.0 2.5 2.0 1.5 1.0 0.5 25 75 LT1521 • TPC23 –25 0 50 100 125 VSHDN = 0V TEMPERATURE (°C) –50 SHUTDOWN PIN THRESHOLD (V) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 50 75 LT1521 • TPC22 –25 25 100 125 ILOAD = 1mA ILOAD = 300mA Shutdown Pin Current Shutdown Pin Input Current SHUTDOWN PIN VOLTAGE (V) SHUTDOWN PIN INPUT CURRENT (mA) 2 4 59 LT1521 • TPC24 13 6 7 8

LT1521-3.3/LT1521-5 1521335fb TYPICAL PERFORMANCE CHARACTERISTICS UW OUT (Pin 1): The output pin supplies power to the load. A minimum output capacitor of 1.5mF is required to prevent oscillations, but larger values of output capacitor will be necessary to deal with larger load transients. See the Applications Information section for more on output capacitance and reverse output characteristics. SENSE (Pin 2): For fixed voltage versions of the LT1521 (LT1521-3, LT1521-3.3, LT1521-5), the sense pin is the input to the error amplifier. Optimum regulation will be obtained at the point where the sense pin is connected to PIN FUNCTIONSUU U LT1521-5 Transient Response TIME (µs) OUTPUT VOLTAGE DEVIATION (V) LOAD CURRENT (mA) 0.2 0.1 –0.1 –0.2 150 100 400 LT1521 • TPC33 10050 150 250 350 450200 300 500 VIN = 6V CIN = 0.1µF COUT = 1.5µF FREQUENCY (Hz) RIPPLE REJECTION (dB) 100 10 1k 10k 1M LT1521 • TPC31 100 100k ILOAD = 150mA VIN = 6V + 50mVRMS RIPPLE COUT = 33µF SOLID TANTALUM COUT = 3.3µF SOLID TANTALUM Ripple Rejection Load Regulation TEMPERATURE (°C) –50 LOAD REGULATION (mV) LT1521 • TPC32 –25 0 50 –10 –15 –20 –25 –30 –35 –40 75 100 125 ∆ILOAD = 1mA TO 300mA LT1521-3.3 LT1521-3 LT1521* LT1521-5 VIN = VOUT (NOMINAL + 1V) *VADJ = VOUT LT1521-5 Transient Response TIME (ms) OUTPUT VOLTAGE DEVIATION (V) LOAD CURRENT (mA) 0.2 0.1 –0.1 –0.2 300 200 100 4.0 LT1521 • TPC34 VIN = 6V CIN = 0.1µF COUT = 33µF the output pin of the regulator. In critical applications small voltage drops caused by the resistance (RP) of PC traces between the regulator and the load, which would normally degrade regulation, may be eliminated by connecting the sense pin to the output at the load as shown in Figure 1 (Kelvin Sense Connection). Note that the voltage drop across the external PC traces will add to the dropout voltage of the regulator. The sense pin bias current is 5mA at the nominal regulated output voltage. This pin is inter- nally clamped to –0.6V (one V BE).

5V logic or by open collector logic with a pull-up resistor. shutdown pin is not connected. Figure 1. Kelvin Sense Connection both reverse input voltages and reverse output voltages. its output and prevents reverse current flow. produced by this device is 3.75V to 20V.

output is turned off and the divider current will be zero. to the output pin. This sets the output voltage to 3.75V.

1. Output current multiplied by the input/output voltage
2. Ground pin current multiplied by the input voltage:

Figure 2. Adjustable Operation of the two components listed above. all sources of thermal resistance from junction to ambient. connected to the ground plane. Table 1. MS8 Package

• Pin 4 is ground. ** Device is mounted on topside.

Table 2. S8 Package*

• Pins 3, 6, 7 are ground. ** Device is mounted on topside.

tion, the junction temperatures should not exceed 125°C. batteries that can be plugged in backward. Table 3. SOT-223 Package

• Tab of device attached to topside copper.

Table 4. Fault Conditions

1. DIMENSIONS IN MILLIMETER/(INCH)
2. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
3. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
4. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

LT1521-3.3/LT1521-5 1521335fb PACKAGE DESCRIPTIONU 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.016 – 0.050 (0.406 – 1.270) 0.010 – 0.020 0°– 8° TYP 0.008 – 0.010 (0.203 – 0.254) SO8 1298 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) TYP 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 1 2 3 4 0.150 – 0.157** (3.810 – 3.988) 8 7 6 5 0.189 – 0.197* (4.801 – 5.004) 0.228 – 0.244 (5.791 – 6.197) DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

LT1521-3.3/LT1521-5 1521335fb PACKAGE DESCRIPTIONU Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 3-Lead Plastic SOT-223 (Reference LTC DWG # 05-08-1630) 0.114 – 0.124 (2.90 – 3.15) 0.248 – 0.264 (6.30 – 6.71) 0.130 – 0.146 (3.30 – 3.71) 0.264 – 0.287 (6.70 – 7.30) 0.0905 (2.30) NOM 0.033 – 0.041 (0.84 – 1.04) 0.181 (4.60) NOM 0.024 – 0.033 (0.60 – 0.84) 0.071 (1.80) MAX 10° MAX 0.012 (0.31) MIN 0.0008 – 0.0040 (0.0203 – 0.1016) 10° – 16° 0.010 – 0.014 (0.25 – 0.36) 10° – 16° ST3 (SOT-233) 1298

LT1521-3.3/LT1521-5 1521335fb ª LINEAR TECHNOLOGY CORPORATION 1 995 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC 1174 425mA High Efficiency Step-Down Switching Regulator >90% Efficiency, SO-8 Package LT1175 500mA Micropower Low Dropout Negative Linear Regulator Selectable Current Limit LT1120A 125mA Micropower Low Dropout Linear Regulator 20 mA Quiescent Current, Includes Comparator LT1304 Micropower Step-Up DC/DC Converter 15 mA Quiescent Current, 1.5 Minimum Input LT1529 3A Micropower Low Dropout Regulator 50 mA Quiescent Current LT1761 100mA Low Noise Micropower Low Dropout Regulator I Q = 30mA, Low Noise 20mVRMS, VIN = 1.8V to 20V, ThinSOT LT1762 150mA Low Noise Micropower Low Dropout Regulator I Q = 30mA, Low Noise 20mVRMS, VIN = 1.8V to 20V, MSOP-8 LT1763 500mA Low Noise Micropower Low Dropout Regulator I Q = 30mA, Low Noise 20mVRMS, VIN = 1.8V to 20V, SO-8 LT1962 300mA Low Noise Micropower Low Dropout Regulator I Q = 30mA, Low Noise 20mVRMS, VIN = 1.8V to 20V, MSOP-8 ThinSOT is a registered trademark of Linear Technology Corporation. Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com LT/CPI 0302 REV B 1.5K • PRINTED IN USA