LT3482 90V Boost DC/DC Converter with APD Current Monitor U FEATURES DESCRIPTIO ■ The LT®3482 is a fixed frequency current mode step-up DC/DC converter with voltage doubler designed to bias avalanche photodiodes (APDs) in optical receivers. It can provide up to 90V output. The LT3482 features high side APD current monitoring with better than 10% relative accuracy over the entire temperature range. The integrated power switch, Schottky diodes and APD current monitor allow a small converter footprint and low solution cost. Constant switching frequency results in predictable output noise that is easy to filter. The inductor-based topology ensures an input free from switching noise. An integrated high side current monitor produces a current proportional to APD current with better than 10% relative accuracy over four decades of dynamic range in the input range of 250nA to 2.5mA. This current can be used as a reference to provide a digitally programmed output voltage via the CTRL pin. The LT3482 is available in the tiny footprint (3mm × 3mm) 16-lead QFN package. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ High Output Voltage: Up to 90V Integrated Schottky Diodes 48V, 280mA Internal Switch High Side APD Current Monitor Adjustable Switching Frequency: 650kHz or 1.1MHz Wide VIN Range: 2.5V to 16V Surface Mount Components Low Shutdown Current: <1µA Soft-Start Internal Compensation CTRL Pin Allows Output Adjustment with No Polarity Inversion 3mm × 3mm 16-Lead QFN Package U APPLICATIO S ■ ■ ■ ■ APD Bias PIN Diode Bias Optical Receivers and Modules Fiber Optic Network Equipment , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO 0.1µF 10µH VIN 5V Output Voltage Ripple SW 1µF PUMP MONIN VIN fSET OFF ON LT3482 VOUT2 SHDN 0.47µF CTRL VOUT1 GND MON 10nF 0.1µF 1M 0.47µF VAPD RIPPLE 100mV/DIV FB APD 10k 85V AT 2.5mA 14k 0.1µF 3482 TA01a 500ns/DIV 3482 TA01b 3482fa 1 LT3482 W W W AXI U U ABSOLUTE RATI GS PIN CONFIGURATION (Note 1) CTRL FB fSET MON TOP VIEW 16 15 14 13 NC 1 12 SHDN APD 2 11 VIN 17 MONIN 3 10 GND VOUT2 4 6 7 8 VOUT1 SW SW 9 5 PUMP Input Voltage (VIN) ....................................................16V VOUT1, SW Voltage ....................................................48V VOUT2, PUMP, MONIN, APD Voltage..........................90V FB Voltage ...................................................................5V SHDN, fSET, CTRL Voltage .........................................16V MON Voltage .............................................................12V Operating Temperature Range (Note 2).................................................... –40°C to 85°C Maximum Junction Temperature .......................... 125°C Storage Temperature Range................... –65°C to 125°C GND UD PACKAGE 16-LEAD (3mm × 3mm) PLASTIC QFN TJMAX = 125°C, θJA = 68°C/W, θJC = 4.2°C/W EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3482EUD#PBF LT3482IUD#PBF LT3482EUD#TRPBF LT3482IUD#TRPBF LCFG LCFG 16-Lead (3mm × 3mm) Plastic QFN 16-Lead (3mm × 3mm) Plastic QFN 0°C to 85°C –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free parts, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, V⎯S⎯H⎯D⎯N = 3V unless otherwise noted. PARAMETER CONDITIONS MIN Minimum Operating Voltage TYP 2.5 CTRL = 1.5V ● 1.215 1.200 Feedback Line Regulation ● FB Pin Bias Current Supply Current FB = 1.3V, Not Switching V⎯S⎯H⎯D⎯N = 0 Switching Frequency fSET = 0V fSET = 2V Maximum Duty Cycle fSET = 0V Switch Current Limit ISW = 150mA Switch Leakage Current SW = 5V Schottky Forward Voltage ISCHOTTKY = 150mA Schottky Reverse Leakage VOUT1 – SW = 50V 16 V 1.235 1.255 1.260 V V 0.025 0.07 %/V 30 100 nA 3.3 0.1 4.0 0.5 mA µA 650 1.1 750 1.3 kHz MHz 360 420 mA 130 220 mV 2 µA 95 280 Switch VCESAT SHDN Voltage High 580 1.0 % 880 mV 5 1.5 UNITS V Maximum Operating Voltage Feedback Voltage MAX µA V 3482fa 2 LT3482 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, V⎯S⎯H⎯D⎯N = 3V unless otherwise noted. PARAMETER CONDITIONS MIN TYP SHDN Voltage Low SHDN Pin Bias Current 35 fSET Voltage High MAX 0.4 V 50 µA 1.5 V fSET Voltage Low fSET Bias Current fSET = 2V CTRL to FB Offset CTRL = 0.5V APD Current Monitor Gain IAPD = 250nA, 10V ≤ MONIN ≤ 90V IAPD = 2.5mA, 20V ≤ MONIN ≤ 90V Monitor Output Voltage Clamp 0.4 V 22 40 µA mV mV ● –5 –10 2 2 10 15 ● ● 0.180 0.185 0.20 0.20 0.215 0.215 11.5 APD Monitor Voltage Drop MONIN – APD at IAPD = 1mA, MONIN = 90V MONIN Pin Current Limit APD = 0V, MONIN = 40V Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. UNITS V 5 15 V mA Note 2: The LT3482E is guaranteed to meet specified performance from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LT3482I is guaranteed to meet performance specifications over the –40°C to 125°C operating temperature range. 3482fa 3 LT3482 U W TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25°C unless otherwise specified) Oscillator Frequency vs Temperature SWITCH CURRENT LIMIT (mA) 1100 FREQUENCY (kHz) fSET = 2V 1000 900 800 fSET = 0V 600 400 360 350 340 SWITCH CURRENT LIMIT (mA) 1200 700 300 250 200 150 100 50 25 75 0 TEMPERATURE (°C) 100 0 125 20 0 40 60 DUTY CYCLE (%) 3482 G01 1.0E-02 80 70 80 90 –2 1.0E-06 –8 1.0E-06 1.0E-04 IAPD (A) 3482 G04 50 25 75 0 TEMPERATURE (°C) 100 125 3482 G06 Switch Saturation Voltage (VCESAT) FB Pin Voltage vs Temperature 1.25 300 VCESAT (mV) 4 3 FB PIN VOLTAGE (V) 250 5 MONIN – APD (V) –10 –50 –25 1.0E-02 IAPD = 2.5mA IAPD = 10µA IAPD = 250nA 3482 G05 6 200 150 100 2 1.24 VIN = 16V VIN = 3V 1.23 50 1 0 1.00E-07 –4 –6 1.0E-09 1.0E-08 7 125 0 1.0E-05 Current Monitor Voltage Drop vs Reference Current 100 MONIN = 90V ERROR (%) IMON (µA) IMON (A) 40 50 60 MONIN (V) 50 75 25 TEMPERATURE (°C) 2 MONIN = 90V 1.0E-08 30 0 APD Current Monitor Accuracy vs Temperature 1.0E-07 20 240 3482 G03 1.0E-04 10 260 200 –50 –25 100 1.0E-03 21 18 280 APD Current Monitor Accuracy IAPD = 100µA 19 300 3482 G02 Current Monitor Output vs MONIN 20 320 220 50 500 –50 –25 22 Switch Current Limit vs Temperature Switch Current Limit vs Duty Cycle 0 1.00E-05 1.00E-03 REFERENCE CURRENT (A) !"& /% 0 50 100 150 200 250 300 SWITCH CURRENT (mA) 350 3482 G08 1.22 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 125 3482 G09 3482fa 4 LT3482 U U U PI FU CTIO S APD (Pin 2): Connect APD cathode to this pin. MONIN (Pin 3): Current Monitor Power Supply Pin. An external lowpass filter can be included here to further reduce supply voltage ripple. VOUT2 (Pin 4): Voltage Doubler Output Pin. Put a 50V rated capacitor between this pin and VOUT1. Tie a resistor divider to the FB pin and GND. VOUT1 (Pin 5): Boost Output Pin. Put a capacitor between this pin and the GND plane. Minimize the length of the trace to the capacitor. PUMP (Pin 6): Charge Pump Pin. Put a 50V rating bypass capacitor between SW and PUMP to form a complete voltage doubler with the internal integrated Schottky diodes. Minimize trace length to the capacitor. SHDN (Pin 12): Shutdown Pin. Tie to 1.5V or higher to enable device; 0.4V or less to disable device. This pin also functions as soft-start between 1.5V and 2V. CTRL (Pin 13): Internal Reference Override Pin. This allows the FB voltage to be externally set between 0V and 1.2V. Tie this pin higher than 1.5V to use the internal reference of 1.235V. FB (Pin 14): Feedback Pin. Connect the output resistor divider tap here. fSET (Pin 15): Oscillator Frequency Selection Pin. Tie this pin to above 1.5V or higher to select the higher switching frequency of 1.1MHz. For lower switching frequency, tie to GND. SW (Pins 7, 8): Switch Pin. Minimize the trace length on this pin to reduce EMI. MON (Pin 16): Current Monitor Output Pin. It sources a current equal to 20% of the APD current and converts to a reference voltage through an external resistor. GND (Pins 9, 10): Ground. Pins connected internally. For best performance, connect both pins to board ground. Exposed Pad (Pin 17): GND. This pin must be soldered to the PCB. VIN (Pin 11): Input Supply Pin. This pin must be locally bypassed. 3482fa 5 LT3482 W FU CTIO AL DIAGRA U U CFLY L1 VIN 11 7 VIN SW 8 6 SW 9 GND D1 PUMP D3 D2 VOUT2 VOUT1 10 GND 1.235V REFERENCE + + – MONIN – A1 RC EAMP + CC 4 Q1 R S Q A2 PWM COMPARATOR + CS 13 CTRL 14 FB R2 FB APD CURRENT MIRROR APD 2 C3 CURRENT SENSE AMPLIFIER 650kHz/1.1MHz OSCILLATOR 12 SHDN C1 CPL 3 – RAMP GENERATOR RS R1 DRIVER Σ VIN C2 5 NC 1 15 fSET 16 MON 3482 BD CONTROL BLOCK R3 C4 U OPERATIO The LT3842 boost converter uses a constant frequency current mode control scheme to provide excellent line and load regulation. Operation can be best understood by referring to the Functional Diagram. At the start of each oscillator cycle, the SR latch is set, which turns on the power switch, Q1. A voltage proportional to the switch current is added to a stabilizing ramp and the resulting sum is fed into the positive terminal of the PWM comparator, A2. When this voltage exceeds the level at the negative input of A2, the SR latch is reset turning off the power switch. The level at the negative input of A2 is set by the error amplifier A1, and is simply an amplified version of the difference between the feedback voltage and the reference voltage of 1.235V, or externally provided CTRL voltage. In this manner, the error amplifier sets the correct peak current level to keep the output in regulation. If the error amplifier’s output increases, more current is delivered to the output; if it decreases, less current is delivered. The LT3482 has an integrated high side APD current monitor with a 5:1 ratio. The MONIN pin can accept a supply voltage up to 90V, which is suitable for APD photodiode applications. The MON pin has an open-circuit protection feature and is internally clamped to 11.5V. If an APD is tied to the APD pin, the current will be mirrored to the MON pin and converted to a voltage signal by the resistor R3. This voltage signal can be used to drive an external control block to adjust the APD voltage by adjusting the feedback threshold of EAMP A1 through the CTRL input. 3482fa 6 LT3482 U W U U APPLICATIO S I FOR ATIO Table 1. Inrush Peak Current Switching Frequency The LT3482 can operate at either 650kHz nominal or 1.1MHz nominal; the voltage at the fSET pin selects which frequency is used. At 1.1MHz, a physically smaller inductor and capacitor can be used in a given application, but higher frequencies will slightly decrease efficiency and maximum duty cycle. Generally if efficiency and maximum duty cycle are crucial, the lower switching frequency should be selected by connecting fSET to GND. If application size and cost are more important, connect fSET to VIN to select the higher switching frequency. VIN (V) L (µH) C (µF) IP (A) 5 10 1 0.87 5 22 1 0.68 Setting Output Voltage The LT3482 is equipped with both an internal 1.235V reference and an auxiliary reference input (the CTRL pin). This allows users to select between using the built-in reference and supplying an external reference voltage. The voltage at the CTRL pin can be adjusted while the chip is operating to alter the output voltage of LT3482 for purposes such as APD’s bias voltage adjustment. To use the internal 1.235V reference, the CTRL pin should be held higher than 1.5V, which can be done by tying it to VIN. When the CTRL pin is between 0V and 1.2V, the LT3482 will regulate the output such that the FB pin voltage is equal to the CTRL pin voltage. Inrush Current The LT3482 has built-in Schottky diodes for the boost and charge pump. When supply voltage is applied to the VIN pin, the voltage difference between VIN and VOUT1 generates inrush current flowing from input through the inductor and the Schottky diode (D1 in the Functional Diagram) to charge the output capacitor. The selection of inductor and capacitor value should ensure the peak of the inrush current to be below 1A. In addition, the LT3482 turn-on should be delayed until the inrush current is less than the maximum current limit. The peak inrush current can be estimated as follows: To set the output voltage, select the values of R1 and R2 (see Figure 1) according to the following equation: ⎛V ⎞ R1= R2 ⎜ OUT2 – 1⎟ ⎝ VREF ⎠ where VREF = 1.235V if the internal reference is used or VREF = CTRL if CTRL is between 0V and 1.2V. R2 can be selected to load the output to maintain a constant switching frequency when the APD load is very low. Preventing entry into pulse skipping mode is an important consideration for post filtering the regulator output. ⎛ ⎞ ⎜ V – 0.6 π ⎟ • exp ⎜ – IP = IN ⎟ L L ⎟ ⎜ –1 – 1⎟ ⎜⎝ 2 C C ⎠ where L is the inductance and C is the output capacitance. Table 1 gives inrush peak currents for some component selections. VOUT2 4 R1 LT3482 13 CTRL FB 14 R2 3482 F01 Figure 1. Output Voltage Feedback Connection 3482fa 7 LT3482 U W U U APPLICATIO S I FOR ATIO Inductor Selection The inductors used with the LT3482 should have a saturation current rating of 0.3A or greater. If the device is used in an application where the input supply will be hot-plugged, the saturation current rating should be equal to or greater than the peak inrush current. For best loop stability, the inductor value selected should provide a ripple current of 60mA or more. For a given VIN and VOUT1, the inductor value to use in continuous conduction mode (CCM) is estimated by the formula: D • VIN L= ƒ • 60mA where: D= VOUT1 + 1– VIN VOUT1 + 1 and f is the switching frequency. To achieve low output voltage ripple, a small value inductor should be selected to force the LT3482 work in discontinuous conduction mode (DCM). The inequality is true when the LT3482 is operating in discontinuous condition mode. L< D • VIN ƒ • ILIMIT where ILIMIT is the switch current limit. Operating in DCM reduces the maximum load current and the conversion efficiency. Capacitor Selection Low ESR capacitors should be used at the output to minimize the output voltage ripple. Use only X5R and X7R types because they retain their capacitance over wider voltage and temperature ranges than other types. High output voltages typically require less capacitance for loop stability. For applications with out voltage less than 45V, intermediate output pin VOUT1 can directly serve as the output pin. Typically use a 2µF capacitor for output voltage less than 25V and 1µF capacitor for output voltage between 25V and 45V. When output voltage goes beyond 45V, a charge pump must be formed with cascaded 0.47µF capacitors C1 and C2 at the output nodes. A typical 0.1µF capacitor is used as the flying capacitor CFLY to form the charge pump. Always use a capacitor with sufficient voltage rating. Either ceramic or solid tantalum capacitors may be used for the input decoupling capacitor, which should be placed as close as possible to the LT3482. A 1µF capacitor is sufficient for most applications. Phase Lead Capacitor A small value capacitor (i.e., 10pF to 22pF) can be added in parallel with the resistor between the output and the FB pin to reduce output perturbation due to a load step and to improve transient response. This phase lead capacitor introduces a pole-zero pair to the feedback that boosts phase margin near the crossover frequency. The APD is very sensitive to a noisy bias supply. To lowpass filter noise from the internal reference and error amplifier, a 0.1µF phase lead capacitor can be used. The corner frequency of the noise filter is R1 • CPL. APD Current Monitor The power supply switching noise associated with a switching power supply can interfere with the photodiode DC measurement. To suppress this noise, a 0.1µF capacitor is recommended at APD pin. An additional output lowpass filter, a 10k resistor and a 10nF capacitor in parallel at MON pin, can further reduce the power supply noise and other wide band noise, which might limit the measurement accuracy of low level signals. For applications requiring fast current monitor response time, a RC lowpass filter at MONIN pin is used to replace the 0.1µF capacitor at APD pin, as illustrated in Figure 2. RMON MONIN CMON LT3482 VOUT2 C2 VOUT1 C1 APD 3482 F02 Figure 2 3482fa 8 LT3482 U W U U APPLICATIO S I FOR ATIO In some applications, a long cable or wire is used to connect the LT3482 to APD. When APD is shorted to GND, APD pin voltage might ring below ground and damage the internal circuitry. To prevent damage during short-circuit event, a 20Ω resistor must be added in series with the APD. Layout Hints The high speed operation of the LT3842 demands careful attention to board layout. You will not get advertised performance with careless layout. Figure 3 shows the recommended component placement. MON fSET CTRL R2 VIN R1 16 15 14 13 CPL 1 APD 12 2 11 17 CMON (OPT) RMON (OPT) 3 10 4 9 5 C2 6 7 CIN GND L1 8 CFLY C1 3482 F03 Figure 3. Suggested Layout 3482fa 9 LT3482 U TYPICAL APPLICATIO S 5V to 85V APD Bias Power Supply 60 C2 0.1µF L1 10µH VIN 5V Efficiency 50 SW VIN fSET OFF ON PUMP MONIN EFFICIENCY (%) C1 1µF LT3482 SHDN VOUT2 CTRL VOUT1 GND C4 0.47µF C5 0.47µF FB MON R3 10k 30 20 10 R2 14k 85V AT 2.5mA APD C7 10nF R1 1M C6 0.1µF 40 0 0 C3 0.1µF 0.5 1 2 1.5 2.5 IMONIN (mA) 3 3482 TA02a 3.5 3482 TA02b C1: MURATA X7R GRM21BR71C105KA01B C2: AVX 06035C104KAT2A C3, C6: AVX 08051C104KAT2A C4, C5: MURATA X7R GRM31MR71H474KA01B C7: MURATA GRM2167U1H103JA01B L1: COILCRAFT ME3220-103KL OR EQUIVALENT 3.3V to 70V APD Bias Power Supply with Fast Current Monitor Response C2 0.1µF L1 6.8µH VIN 3.3V 60 SW VIN fSET PUMP MONIN R1 100Ω LT3482 SHDN VOUT2 CTRL VOUT1 GND C4 0.47µF C5 0.47µF FB MON R4 10k C6 0.1µF R2 1M C3 0.1µF 40 30 20 10 R3 16.5k APD EFFICIENCY (%) 50 C1 1µF OFF ON Efficiency 0 0 70V AT 2mA 0.5 1 1.5 IMONIN (mA) 2 2.5 3482 TA03a 3482 TA03b C1: MURATA X7R GRM21BR71C105KA01B C2: AVX 06035C104KAT2A C3, C6: AVX 08051C104KAT2A C4, C5: MURATA X7R GRM31MR71H474KA01B L1: COILCRAFT ME3220-682ML OR EQUIVALENT APD Input Load for Current Monitor Step Response Measurement Current Monitor Step Response 2 APD 5V VMON 2V/DIV REF GND 0V 2mA VNODE A 20V/DIV 10k NODE A 2k 0mA REF GND 500ns/DIV 3482 TA03c 3482fa 10 LT3482 U PACKAGE DESCRIPTIO UD Package 16-Lead Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 3.50 ± 0.05 1.45 ± 0.05 2.10 ± 0.05 (4 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 3.00 ± 0.10 (4 SIDES) BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP OR 0.25 × 45° CHAMFER R = 0.115 TYP 0.75 ± 0.05 15 16 PIN 1 TOP MARK (NOTE 6) 0.40 ± 0.10 1 1.45 ± 0.10 (4-SIDES) 2 (UD16) QFN 0904 0.200 REF 0.00 – 0.05 NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.25 ± 0.05 0.50 BSC 3482fa 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11 LT3482 U TYPICAL APPLICATIO 3.3V to 40V APD Bias Power Supply Efficiency L1 5.6mH VIN 3.3V 70 60 SW VIN fSET OFF ON PUMP MONIN 50 R3 100W LT3482 VOUT2 SHDN CTRL VOUT1 GND C2 1mF FB MON R4 10k C3 0.1mF R1 1M C4 0.1mF 40 30 20 10 R2 28k APD EFFICIENCY (%) C1 1mF 0 40V AT 3mA 0 3482 TA04a 0.5 1 1.5 2 2.5 3 3.5 4 IMONIN (mA) 3482 TA04b C1: MURATA X7R GRM21BR71C105KA01B C2: MURATA X7R GRM31MR71H105KA88B C3, C4: AVX 06035C104KAT2A L1: COILCRAFT ME3220-562ML OR EQUIVALENT RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1930/LT1930A 1A (ISW), 1.2MHz/2.2MHz High Efficiency Step-Up DC/DC Converters VIN: 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD < 1µA, ThinSOTTM Package LT3460 0.3A (ISW), 1.3MHz High Efficiency Step-Up DC/DC Converter VIN: 2.5V to 16V, VOUT(MAX) = 38V, IQ = 2mA, ISD < 1µA, ThinSOT Package LT3461/LT3461A 0.3A (ISW), 1.3MHz/3MHz High Efficiency Step-Up DC/DC Converters with Integrated Schottky VIN: 2.5V to 16V, VOUT(MAX) = 38V, IQ = 2.8mA, ISD < 1µA, SC70 and ThinSOT Package LT3465/LT3465A Constant Current, 1.2MHz/2.7MHz High Efficiency White LED Boost Regulator with Integrated Schottky VIN: 2.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1µA, ThinSOT Package ThinSOT is a trademark on Linear Technology Corporation. 3482fa 12 Linear Technology Corporation LT 0207 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2006