LT1617-1

LT1617-1_15 LINER | Alldatasheet

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1617/LT1617-1 are micropower inverting DC/DC converters in a 5-lead SOT-23 package. The LT1617 is designed for higher power systems with a 350mA current limit and an input voltage range of 1.2V to 15V, whereas the LT1617-1 is intended for lower power and single-cell applications with a 100mA current limit and an extended input voltage range of 1V to 15V. Otherwise, the two devices are functionally equivalent. Both devices feature a quiescent current of only 20mA at no load, which further reduces to 0.5mA in shutdown. A current limited, fixed off- time control scheme conserves operating current, result- ing in high efficiency over a broad range of load current. The 36V switch allows high voltage outputs up to – 34V to be easily generated without the use of costly transformers. The LT1617’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications. n Low Quiescent Current: 20mA in Active Mode <1mA in Shutdown Mode n Operates with VIN as Low as 1V n Low VCESAT Switch: 250mV at 300mA n Uses Small Surface Mount Components n High Output Voltage: Up to – 34V n Tiny 5-Lead SOT-23 Package n LCD Bias n Handheld Computers n Battery Backup n Digital Cameras , LTC and LT are registered trademarks of Linear Technology Corporation. 1-Cell Li-Ion to –15V Inverting Converter Efficiency VIN SW NFB LT1617 VIN 2.5V TO 4.2V 22µH SHDN 24.9k 267k 4.7µF –15V 12mA 1617/-1 TA01 GNDC1 4.7µF C1: TAIYO YUDEN LMK316BJ475 C2: TAIYO YUDEN EMK316BJ475 C3: TAIYO YUDEN TMK316BJ224 L1, L2: MURATA LQH3C220K34 D1: MOTOROLA MBR0530 22µH 0.22µF LOAD CURRENT (mA) 0.1 1 10 30 EFFICIENCY (%) 1617/-1 TA01a VIN = 4.2V VIN = 2.5V

ABSOLUTE AXI U RATI GSW WW U PACKAGE/ORDER I FOR ATIOUU W (Note 1) Operating Temperature Range (Note 2) .. – 40°C to 85°C ORDER PART NUMBER LT1617ES5 LT1617ES5-1 Consult factory for Industrial and Military grade parts. S5 PART MARKING SW 1 GND 2 TOP VIEW S5 PACKAGE 5-LEAD PLASTIC SOT-23 NFB 3

5 VIN

4 SHDN

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage LT1617-1 1.0 V LT1617 1.2 V Quiescent Current Not Switching 20 30 mA VSHDN = 0V 1 mA FB Comparator Trip Point l –1.205 –1.23 –1.255 V FB Comparator Hysteresis 8m V Output Voltage Line Regulation 1.2V < V IN < 12V 0.05 0.1 %/V FB Pin Bias Current (Note 3) V NFB = –1.23V l 1.3 2 2.7 mA Switch Off Time 400 ns Switch VCESAT ISW = 60mA (LT1617-1) 85 120 mV ISW = 300mA (LT1617) 250 350 mV Switch Current Limit LT1617-1 75 100 125 mA LT1617 300 350 400 mA SHDN Pin Current V SHDN = 1.2V 2 3 mA VSHDN = 5V 8 12 mA SHDN Input Voltage High 0.9 V SHDN Input Voltage Low 0.25 V Switch Leakage Current Switch Off, V SW = 5V 0.01 5 mA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1617 and LT1617-1 are guaranteed to meet specifications from 0°C to 70°C. Specifications over the –40 °C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Bias current flows out of the NFB pin. TJMAX = 125°C, qJA = 256°C/W temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted. LTKF LTKA

TYPICAL PERFOR A CE CHARACTERISTICSUW Switch Saturation Voltage (VCESAT) Quiescent Current Feedback Pin Voltage and Bias Current TEMPERATURE (°C) –50 –25 0 25 50 75 100 SWITCH VOLTAGE (V) 1617/-1 G01 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 ISWITCH = 500mA ISWITCH = 300mA TEMPERATURE (°C) –50 FEEDBACK VOLTAGE (V) 1617/-1 G02 –1.25 –1.24 –1.23 –1.22 –1.21 –1.20 BIAS CURRENT (µA) CURRENT VOLTAGE –25 0 25 50 75 100 TEMPERATURE (°C) QUIESCENT CURRENT (µA) 1617/-1 G03 –50 –25 0 25 50 75 100 VIN = 12V VIN = 1.2V VFB = 1.23V NOT SWITCHING PI FU CTIO S UU U SW (Pin 1): Switch Pin. This is the collector of the internal NPN power switch. Minimize the metal trace area con- nected to this pin to minimize EMI. GND (Pin 2): Ground. Tie this pin directly to the local ground plane. NFB (Pin 3): Feedback Pin. Set the output voltage by selecting values for R1 and R2 (see Figure 1): R V R OUT 12 3 12 3 21 0 6 + () - . · SHDN (Pin 4): Shutdown Pin. Tie this pin to 0.9V or higher to enable the device. Tie below 0.25V to turn off the device. VIN (Pin 5): Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. TEMPERATURE (°C) SWITCH OFF TIME (ns) 1617/-1 G04 550 500 450 400 350 300 250 –50 –25 0 25 50 75 100 VIN = 1.2V VIN = 12V TEMPERATURE (°C) SWITCH CURRENT LIMIT (mA) 1617/-1 G05 400 350 300 250 200 150 100 –50 –25 0 25 50 75 100 VIN = 1.2V VIN = 12V VIN = 1.2V LT1617-1 LT1617 VIN = 12V SHUTDOWN PIN VOLTAGE (V) SHUTDOWN PIN CURRENT (µA) 1617/-1 G06 0 5 10 15 25°C 100°C Switch Off Time Shutdown Pin Current Switch Current Limit

Figure 1. LT1617 Block Diagram reference voltage is 12mV instead of 42mV).

correct inductance value for your design. Table 1. Recommended Inductors minimum VIN value in the equation below.

by the inductor (and the diode) during normal operation. be used at the output to minimize the output ripple voltage. a capacitor with a sufficient voltage rating. inductor current, then delivering that current to the load. Table 2. Recommended Capacitors

– 33V Inverting Charge Pump Converter VIN SW NFB LT1617 VIN 10µH D2 SHDN 24.9k 619k 1µF –33V 20mA 1617/-1 TA03 GNDC1 4.7µF C1: TAIYO YUDEN LMK316BJ475 (408) 573-4150 C2: TAIYO YUDEN GMK316BJ105 (408) 573-4150 C3: TAIYO YUDEN GMK212BJ224 (408) 573-4150 L1: MURATA LQH3C100K24 (814) 237-1431 D1: MOTOROLA MBR0540 (800) 441-2447 0.22µF VIN SW NFB LT1617 10µH SHDN 24.9k 73.2k 10µF –5V 100mA VIN 1617/-1 TA02 GNDC1 4.7µF C1: TAIYO YUDEN LMK316BJ475 (408) 573-4150 C2: TAIYO YUDEN JMK316BJ106 (408) 573-4150 C3: TAIYO YUDEN EMK212BJ474 (408) 573-4150 L1, L2: MURATA LQH3C100K24 (814) 237-1431 D1: MOTOROLA MBR0520 (800) 441-2447 10µH 0.47µF 100pF 5V to – 5V Inverting Converter 1-Cell to – 9V Inverting Converter VIN SW NFB LT1617-1 47µH SHDN 24.9k 150k 4.7µF –9V 2.5mA VIN 1V TO 1.5V 1617/-1 TA02 GNDC1 4.7µF C1: TAIYO YUDEN LMK316BJ475 (408) 573-4150 C2: TAIYO YUDEN EMK316BJ475 (408) 573-4150 C3: TAIYO YUDEN TMK316BJ224 (408) 573-4150 L1, L2: MURATA LQH3C470K34 (814) 237-1431 D1: CENTRAL SEMICONDUCTOR CMDSH-3 (516) 435-1110 47µH 0.22µF 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.

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear-tech.com ª LINEAR TECHNOLOGY CORPORA TION 1 999 16171f LT/TP 0200 4K • PRINTED IN USA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1307 Single-Cell Micropower 600kHz PWM DC/DC Converter 3.3V at 75mA from One Cell, MSOP Package LT1316 Burst Mode TM Operation DC/DC with Programmable Current Limit 1.5V Minimum, Precise Control of Peak Current Limit LT1317 2-Cell Micropower DC/DC with Low-Battery Detector 3.3V at 200mA from Two Cells, 600kHz Fixed Frequency LT1610 Single-Cell Micropower DC/DC Converter 3V at 30mA fro 1V, 1.7MHz Fixed Frequency LT1611 1.4MHz Inverting Switching Regulator in 5-Lead SOT-23 –5V at 150mA from 5V Input, Tiny SOT-23 Package LT1613 1.4MHz Switching Regulator in 5-Lead SOT-23 5V at 200mA from 3.3V Input, Tiny SOT-23 Package LT1615 Micropower DC/DC Converter in 5-Lead SOT-23 20V at 12mA from 2.5V Input, Tiny SOT-23 Package Burst Mode is a trademark of Linear Technology Corporation PACKAGE DESCRIPTIO U Dimensions in millimeters (inches) unless otherwise noted. 5-Lead Plastic SOT-23 (LTC DWG # 05-08-1633) 0.95 (0.037) REF 1.50 – 1.75 (0.059 – 0.069) 0.10 – 0.60 (0.004 – 0.024) REF 0.35 – 0.50 (0.014 – 0.020) FIVE PLACES (NOTE 2) S5 SOT-23 0797 2.80 – 3.00 (0.110 – 0.118) (NOTE 3) 1.90 (0.074) REF 0.90 – 1.45 (0.035 – 0.057) 0.90 – 1.30 (0.035 – 0.051) 0.00 – 0.15 (0.00 – 0.006) 0.09 – 0.20 (0.004 – 0.008) (NOTE 2) 2.60 – 3.00 (0.102 – 0.118) NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DIMENSIONS ARE INCLUSIVE OF PLATING 3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 4. MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) TYPICAL APPLICATIO SU –20V Dual Output Converter with Load Disconnect VIN SW NFB LT1617 VIN 1.5V TO 5V 10µH D1 SHDN 24.9k 267k 1µF –20V 4mA 20V 4mA 1617/-1 TA04 GND 1µF 4.7µF C1: TAIYO YUDEN LMK316BJ475 (408) 573-4150 C2, C3, C4: TAIYO YUDEN TMK316BJ105 (408) 573-4150 C5: TAIYO YUDEN LMK212BJ105 (408) 573-4150 L1: MURATA LQH3C100K24 (814) 237-1431 D1, D2, D3, D4: MOTOROLA MBR0530 (800) 441-2447 100pF 1µF C4 1µF