{"product_id":"ltc4054-sot23-5-linear-li-ion-battery-charger-ic-4-2v-500ma","title":"LTC4054 SOT-23-5 Linear Li-Ion Battery Charger IC 4.2V 500mA (10-Pack)","description":"\u003ch2\u003eLTC4054 SOT-23-5 Linear Li-Ion Battery Charger IC - 4.2V \/ 500mA (10-Pack)\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eLTC4054\u003c\/strong\u003e (also LTC4054ES5-4.2) is a standalone linear charger IC for single-cell \u003cstrong\u003e3.7V Li-ion and LiPo batteries\u003c\/strong\u003e in a compact \u003cstrong\u003eSOT-23-5\u003c\/strong\u003e surface-mount package. With programmable charge current up to \u003cstrong\u003e800mA\u003c\/strong\u003e, built-in thermal regulation, and a charge status output, it is the simplest way to add USB or wall adapter Li-ion charging to any portable device design.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eLTC4054 \/ LTC4054ES5-4.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eSOT-23-5 (SMD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Chemistry\u003c\/td\u003e\n\u003ctd\u003eSingle-cell Li-ion \/ LiPo (3.7V nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFloat Voltage\u003c\/td\u003e\n\u003ctd\u003e4.2V (fixed, +\/-1%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Charge Current\u003c\/td\u003e\n\u003ctd\u003e800mA (set by RPROG resistor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e4.25V - 6.5V (USB 5V compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharge Termination\u003c\/td\u003e\n\u003ctd\u003eC\/10 current cutoff (automatic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermal Regulation\u003c\/td\u003e\n\u003ctd\u003eYes - reduces current to limit junction temp to 115C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCHRG Status Pin\u003c\/td\u003e\n\u003ctd\u003eOpen-drain (LOW = charging, Hi-Z = complete\/standby)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuiescent Current\u003c\/td\u003e\n\u003ctd\u003e85uA (charging) \/ 2uA (standby)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e10 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eCharge Current Setting\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eRPROG (kohm)\u003c\/th\u003e\n\u003cth\u003eCharge Current\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10k\u003c\/td\u003e\n\u003ctd\u003e~100mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e4k\u003c\/td\u003e\n\u003ctd\u003e~250mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2k\u003c\/td\u003e\n\u003ctd\u003e~500mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.2k\u003c\/td\u003e\n\u003ctd\u003e~800mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose LTC4054?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB 5V Compatible\u003c\/strong\u003e - Direct connection to USB VBUS (4.25V-6.5V input range)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Regulation\u003c\/strong\u003e - Automatically reduces charge current to prevent overheating; no heatsink needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgrammable Current\u003c\/strong\u003e - Single resistor sets charge current from 100mA to 800mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Termination\u003c\/strong\u003e - Stops charging at C\/10 current; no external timer needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSOT-23-5 Package\u003c\/strong\u003e - Minimal PCB footprint for space-constrained wearable and IoT designs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUSB-powered Li-ion\/LiPo battery charger for IoT devices\u003c\/li\u003e\n\u003cli\u003eWearable device battery charging circuit\u003c\/li\u003e\n\u003cli\u003ePortable sensor node battery management\u003c\/li\u003e\n\u003cli\u003eArduino\/ESP32 project Li-ion charging module\u003c\/li\u003e\n\u003cli\u003ePower bank charging IC\u003c\/li\u003e\n\u003cli\u003eSingle-cell LiPo charger for RC models and drones\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMinimal Application Circuit\u003c\/h3\u003e\u003cp\u003eVCC to USB 5V. BAT to Li-ion battery positive. GND to battery negative. RPROG resistor (2k ohm for 500mA) from PROG pin to GND. CHRG pin to LED via 10k ohm pull-up to VCC for charge status indicator. No other components required.\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Can LTC4054 charge a 2-cell (7.4V) Li-ion pack?\u003c\/strong\u003e No - LTC4054 is designed for single-cell (4.2V) only. For multi-cell packs, use LTC4002, BQ24195, or dedicated multi-cell charger ICs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is LTC4054 the same as TP4054?\u003c\/strong\u003e Yes - TP4054 is a Chinese-manufactured equivalent with identical pinout and specifications. Both are drop-in replacements for each other.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e10x LTC4054 SOT-23-5 Li-Ion Battery Charger IC\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991507063019,"sku":"\u003cnone\u003e","price":4.84,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/LTC4054_SOT-23-5_Lithium-Ion_Battery_Charger_SMD_IC_Chipset_for_3.7V_Li-ion_Cells.webp?v=1761529703","url":"https:\/\/keszoox.com\/products\/ltc4054-sot23-5-linear-li-ion-battery-charger-ic-4-2v-500ma","provider":"Keszoox","version":"1.0","type":"link"}