The TLV1117IDCYR from Texas Instruments is an 800-mA, adjustable and fixed-output LDO linear regulator in a 4-pin SOT-223 (DCY) package (6.5 x 3.5 mm). The ‘I’ suffix indicates -40\u00b0C to +125\u00b0C industrial temperature range. Input voltage range is 2.7 V to 15 V. The adjustable version outputs 1.25 V to 13.8 V via external resistor divider (VREF = 1.25 V). Fixed versions available in 1.5V, 1.8V, 2.5V, 3.3V, and 5V. Dropout voltage is 1.3 V max at 800 mA. The new-chip fixed version features 60-\u00b5A IQ, internal soft-start, foldback current limit, and \u00b11% output accuracy. The adjustable version has 5-mA typical IQ and requires 1.7-mA minimum load. Designed as an enhanced AMS1117\/AMS1117-3.3 replacement with improved accuracy and protection.<\/p>","protected":false},"excerpt":{"rendered":"
The TLV1117IDCYR from Texas Instruments is an 800-mA, adjustable and fixed-output LDO linear regulator in a 4-pin SOT-223 (DCY) package (6.5 x 3.5 mm). The ‘I’ suffix indicates -40\u00b0C to +125\u00b0C industrial temperature range. Input voltage range is 2.7 V to 15 V. The adjustable version outputs 1.25 V to 13.8 V via external resistor […]<\/p>\n","protected":false},"author":2,"featured_media":2879,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,32],"tags":[],"chip_brand":[138],"class_list":["post-2047","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-integrated-circuits-ics","category-low-dropout-regulators-ldo","chip_brand-ti"],"acf":{"brief_explanation":"800mA LDO, 2.7-15V in, 1.25-13.8V adj out, 1.3V Vdo@800mA, SOT-223, -40~125\u00b0C, soft-start (fixed)","date_code":"","package_case":"SOT-223 (DCY) (6.5 x 3.5 x 1.7 mm, 2.3mm pitch, tab = VOUT pin 2)","in_stock":9855,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tlv1117.pdf","price":"$0.35 (1K+ pcs)","product_introduction":"The TLV1117 is an 800-mA LDO regulator from TI that serves as an enhanced, pin-compatible replacement for the ubiquitous AMS1117 and LM1117 series. The device supports input voltages from 2.7 V to 15 V, covering the common 3.3-V, 5-V, and 12-V supply rails found in consumer, industrial, and medical electronics.\n\nThe TLV1117 is available in both adjustable (1.25-13.8 V via external divider) and fixed-output (1.5V, 1.8V, 2.5V, 3.3V, 5V) versions. The IDCYR suffix specifically denotes the industrial-temperature adjustable version in SOT-223 tape-and-reel packaging. TI has updated the TLV1117 with a 'new chip' revision for fixed-output versions that significantly improves performance: quiescent current drops from 5 mA to 60 \u00b5A, output accuracy improves from \u00b13.75% to \u00b11%, and internal soft-start and foldback current limit are added.\n\nFor the adjustable version (TLV1117IDCYR), the output voltage is set by two external resistors: VOUT = 1.25 V \u00d7 (1 + R1\/R2). A minimum load of 1.7 mA (typical) must be maintained for stable regulation; this can be provided by the feedback resistor network. A minimum 10-\u00b5F tantalum output capacitor is required for stability; modern designs can substitute a 10-\u00b5F ceramic with appropriate ESR.\n\nThe SOT-223 (DCY) package is the industry-standard footprint for 800-mA LDOs, enabling direct drop-in replacement of AMS1117-3.3, LM1117-3.3, and LD1117 designs. The thermal tab (pin 2) is connected to VOUT and serves as the primary heat-dissipation path. The R\u03b8JA of 95.4\u00b0C\/W (new chip, DCY) limits practical power dissipation to approximately 1 W without a thermal pad, corresponding to a 1.25-V dropout at 800 mA.\n\nKey differentiators over the generic AMS1117 include: \u00b11% accuracy (fixed, new chip) vs \u00b12-3%; 60-\u00b5A IQ (fixed, new chip) vs 5-10 mA; internal soft-start (fixed, new chip) eliminating inrush current; and foldback current limit (fixed, new chip) reducing power dissipation during faults.","working_principle":"**Pass Transistor and Error Amplifier:** The TLV1117 uses a PNP pass transistor in an NPN\/PNP Darlington configuration, which is the source of the relatively high 1.3-V dropout voltage (the PNP must maintain VBE + VCE(sat) across the pass element). The error amplifier compares the feedback voltage (from the internal divider for fixed, or external divider for adjustable) with the 1.205-V bandgap reference, driving the Darlington base to maintain regulation.\n\n**Adjustable Output Configuration:** For the TLV1117IDCYR (adjustable), the ADJ\/GND pin connects to the junction of external resistors R1 (VOUT to ADJ) and R2 (ADJ to GND). The ADJ pin sources ~50 \u00b5A of bias current, which creates a small error proportional to R2. The output voltage is VOUT = VREF \u00d7 (1 + R1\/R2) + IADJ \u00d7 R2.\n\n**New-Chip Enhancements (Fixed Versions):** The new chip revision replaces the NPN\/PNP Darlington with a PMOS pass element for fixed-output versions, dramatically reducing IQ from 5 mA to 60 \u00b5A and enabling true shutdown with 1.5-\u00b5A IQ. The internal soft-start gradually ramps the output voltage, limiting inrush current. The foldback current limit reduces the current limit during output shorts (from 800 mA to ~200 mA), dramatically reducing power dissipation during faults: PD = VIN \u00d7 IFOLDBACK instead of (VIN - VOUT) \u00d7 ILIMIT.\n\n**Thermal Protection:** An internal thermal shutdown circuit disables the output when junction temperature exceeds ~165\u00b0C, with ~10\u00b0C hysteresis. This prevents irreversible damage during sustained overloads.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | GND\/ADJ<\/td> | G\/I<\/td> | Adjustable: feedback adjust pin; connect to R1\/R2 divider junction; Fixed: ground connection; pin function depends on version<\/td><\/tr> | ||||||||||||||||||||||||||||
| 2<\/td> | VOUT (Tab)<\/td> | O<\/td> | Regulated output; thermal tab is electrically VOUT; solder tab to PCB copper pour for heat dissipation; max 800mA; bypass with \u226510\u00b5F<\/td><\/tr> | ||||||||||||||||||||||||||||
| 3<\/td> | VIN<\/td> | P<\/td> | Input supply; 2.7V to 15V; bypass with 10\u00b5F ceramic; input voltage must exceed VOUT + VDO at max load<\/td><\/tr> | ||||||||||||||||||||||||||||
| 4<\/td> | VOUT<\/td> | O<\/td> | Regulated output (parallel with pin 2\/tab); both pins 2 and 4 must be connected together on PCB<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|