The LT1617ES5#TRPBF is an Analog Devices micropower inverting DC\/DC converter with 350mA switch, 1.2-15V input, up to -34V output, 20uA IQ, and 400ns off-time. Packaged in TSOT-23-5, -40C to +85C.<\/p>\n
| \u062c\u0647\u062f \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n | 1.2 V to 15 V<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||
| \u0627\u0644\u0645\u062e\u0631\u062c\u0627\u062a<\/td>\n | Up to -34 V<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||
| Switch Current<\/td>\n | 350 mA<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||
| IQ<\/td>\n | 20 uA active<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||
| Off-time<\/td>\n | 400 ns fixed<\/td>\n<\/tr>\n | |||||||||||||||||||||||||||||||||
| \u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n | TSOT-23-5<\/td>\n<\/tr>\n<\/table>\n\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\nProduct Overview The LT1617ES5#TRPBF is an Analog Devices micropower inverting DC\/DC converter with 350mA switch, 1.2-15V input, up to -34V output, 20uA IQ, and 400ns off-time. Packaged in TSOT-23-5, -40C to +85C. Key Specifications Input Voltage 1.2 V to 15 V Output Up to -34 V Switch Current 350 mA IQ 20 uA active Off-time […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[31,13],"tags":[],"chip_brand":[165],"class_list":["post-8935","post","type-post","status-publish","format-standard","hentry","category-dc-dc-converters","category-integrated-circuits-ics","chip_brand-adi"],"acf":{"brief_explanation":"Inverting DC\/DC, 350mA, -34V out, 20uA IQ, TSOT-23-5","date_code":"","package_case":"5-Lead TSOT-23 (2.9 x 1.6 x 0.9 mm)","in_stock":669,"datasheet":"https:\/\/www.analog.com\/media\/en\/technical-documentation\/data-sheets\/16171f.pdf","price":"$4.15 @ 1ku","product_introduction":"The LT1617ES5#TRPBF is an Analog Devices (formerly Linear Technology) micropower inverting DC\/DC converter in a 5-lead TSOT-23 package. The device generates negative output voltages from positive inputs, producing outputs as low as -34V from a 1.2V to 15V input without transformers. The 350mA internal switch current limit and 36V switch voltage rating support a wide range of output voltage and current combinations. The constant off-time control scheme with 400ns fixed off-time conserves operating current across the load range, achieving high efficiency at both light and heavy loads. The 20uA no-load quiescent current and 0.5uA shutdown current minimize battery drain in portable applications. The 250mV VCESAT at 300mA ensures high efficiency by minimizing switch conduction losses. The compact TSOT-23-5 package and the 400ns off-time allow the use of tiny surface-mount inductors and capacitors, minimizing solution footprint for space-constrained handheld devices. The TRPBF suffix indicates tape-and-reel with lead-free finish. The LT1617-1 variant provides a 100mA current limit for lower-power applications. Packaged in TSOT-23-5 rated for -40C to +85C.","working_principle":"The LT1617 uses a constant off-time, current-limited control scheme. When the output voltage is below the regulation threshold (NFB pin below -1.23V), the internal 350mA NPN power switch (Q3) turns on, ramping up the inductor current. When the switch current reaches 350mA, the current comparator trips and the one-shot turns off Q3 for a fixed 400ns. During the off-time, the inductor current flows through the external Schottky diode to the output capacitor, delivering energy to the load. This on-off cycling continues until the output voltage reaches regulation, at which point the feedback comparator disables the internal circuitry until the output drops again. The constant off-time control inherently limits the maximum duty cycle and provides a well-defined switching frequency that varies with input and output voltage. The negative feedback (NFB) pin senses the output voltage through an external resistor divider, with the internal reference at -1.23V. The SHDN pin disables the converter and reduces IQ to 0.5uA. For inverting topologies, the switch sees VIN + |VOUT|, so the 36V switch rating limits the total of input plus output magnitude.","pin_description":"
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