The TLV70433DBVR from Texas Instruments is a 24-V, 150-mA, fixed 3.3-V output, ultra-low-IQ low-dropout linear regulator in a 5-pin SOT-23 (DBV) package (2.9 x 1.6 mm). It operates with input voltage from 2.5 V to 24 V (30 V absolute max for new chip), with only 3.4-\u00b5A typical quiescent current stable across the full load range. Dropout voltage is typically 850 mV at 100 mA. The device features internal soft-start, overcurrent protection, and reverse polarity protection. PSRR is 60 dB at 100 kHz. Stable with output capacitor \u2265 0.47 \u00b5F. Operating junction temperature range is -40\u00b0C to +125\u00b0C.<\/p>","protected":false},"excerpt":{"rendered":"
The TLV70433DBVR from Texas Instruments is a 24-V, 150-mA, fixed 3.3-V output, ultra-low-IQ low-dropout linear regulator in a 5-pin SOT-23 (DBV) package (2.9 x 1.6 mm). It operates with input voltage from 2.5 V to 24 V (30 V absolute max for new chip), with only 3.4-\u00b5A typical quiescent current stable across the full load […]<\/p>\n","protected":false},"author":2,"featured_media":2878,"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-2046","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":"24V 150mA LDO, fixed 3.3V out, 3.4\u00b5A IQ, 850mV Vdo@100mA, SOT-23-5, -40~125\u00b0C, soft-start","date_code":"","package_case":"SOT-23-5 (DBV) (2.9 x 1.6 x 1.15 mm, 0.95mm pitch)","in_stock":26861,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/tlv704.pdf","price":"$0.26 (1K+ pcs)","product_introduction":"The TLV70433DBVR is the 3.3-V fixed-output variant of TI's TLV704 family of ultra-low-quiescent-current LDO regulators. The device is designed for battery-powered and low-power MCU applications where extended battery life is paramount. The 3.4-\u00b5A typical quiescent current (4.5 \u00b5A max) is stable across the entire 0-150 mA output load range, meaning the regulator draws virtually no extra current at light loads.\n\nThe wide 2.5-V to 24-V input range (30 V absolute max for new chip) allows direct connection to unregulated supplies such as 12-V or 24-V industrial buses, unconditioned solar panels, or multi-cell battery packs without pre-regulation. This eliminates the need for a front-end buck converter in many low-power applications, reducing BOM count and cost.\n\nThe 850-mV typical dropout voltage at 100 mA reflects the high input-to-output differential that the device can tolerate. While not a low-dropout device in the traditional sense (compared to sub-200-mV LDOs), the TLV704 trades dropout performance for ultra-low IQ, which is the correct trade-off for always-on battery-powered systems where load current is modest.\n\nInternal soft-start limits inrush current into the output capacitor during power-up, preventing voltage overshoot on the output rail. The overcurrent protection uses a brick-wall current limit scheme that clamps output current during faults. Reverse polarity protection prevents damage when input voltage is applied in reverse, a common failure mode in battery-powered systems.\n\nThe SOT-23-5 package (2.9 x 1.6 mm) occupies only 4.64 mm\u00b2 of board area, making the TLV70433DBVR one of the smallest 24-V LDOs available. The MSL-1 rating allows unlimited floor life before soldering, simplifying manufacturing logistics. The device requires only a 0.47-\u00b5F minimum output capacitor (1 \u00b5F recommended), enabling compact layouts.","working_principle":"**CMOS Pass Element:** The TLV704 uses a P-channel MOSFET pass element controlled by an error amplifier. The error amplifier compares a fraction of the output voltage (via an internal R1\/R2 divider for fixed-output versions) with a 1.205-V bandgap reference. The PMOS gate is driven to maintain regulation. The high RDS(on) of the PMOS accounts for the relatively high dropout voltage but enables the ultra-low 3.4-\u00b5A ground current.\n\n**Ultra-Low Quiescent Current:** The TLV704 achieves 3.4-\u00b5A IQ by using a micropower bandgap reference and a minimal bias current architecture. Unlike bipolar LDOs that require 0.5-5 mA of ground current, the CMOS design draws nearly constant IQ across the entire load range, because the error amplifier and reference consume the vast majority of the ground current.\n\n**Internal Soft-Start:** During power-up, an internal current source charges the output capacitor gradually. This limits inrush current, reduces output voltage overshoot, and prevents stress on the input supply. The soft-start time is proportional to the output capacitor value.\n\n**Overcurrent Protection:** A brick-wall current limit senses output current and clamps it to a fixed level (typically 300 mA). When the load exceeds this limit, the output voltage drops while the current remains clamped. The device enters thermal cycling if power dissipation causes overheating.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | IN<\/td> | P<\/td> | Input supply; 2.5V to 24V (30V abs max for new chip); bypass with 0.1\u00b5F ceramic to GND<\/td><\/tr> | ||||||||||||||||||||||||||||
| 2<\/td> | GND<\/td> | G<\/td> | Ground; connect to PCB ground plane<\/td><\/tr> | ||||||||||||||||||||||||||||
| 3<\/td> | EN<\/td> | I<\/td> | Enable input; drive high (>1.2V) to enable; drive low (<0.4V) to disable; internal pull-up to IN if left floating<\/td><\/tr> | ||||||||||||||||||||||||||||
| 4<\/td> | NC<\/td> | -<\/td> | No internal connection; leave floating<\/td><\/tr> | ||||||||||||||||||||||||||||
| 5<\/td> | OUT<\/td> | O<\/td> | Fixed 3.3V output; bypass with \u22650.47\u00b5F ceramic capacitor (1\u00b5F recommended); max load 150mA<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|