LR1107G-18-AA3-A-R - 1.8V 600mA Ultra LDO Regulator | UTC
부품 번호: LR1107G-18-AA3-A-R ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.36 | $3.60 |
| 100 | $0.28 | $28.00 |
| 500 | $0.22 | $110.00 |
| 1,000 | $0.18 | $180.00 |
| 3,000 | $0.15 | $450.00 |
LR1107G-18-AA3-A-R 개요
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only marginally above the output voltage. Within the broader power-management taxonomy, LDOs sit under linear regulators, which sit under voltage regulators, which are themselves part of the power-management integrated-circuit family. LDOs differ from switching regulators in that they dissipate excess voltage as heat rather than storing energy in an inductor, trading efficiency for very low output noise - a valuable trait for analog, RF, and digital-core rails.
Key features of the LR1107G-18-AA3-A-R include a typical dropout of around 200 mV at full 600 mA load, a ground-pin current of roughly 150 uA at 1 mA load, and a fast transient response that makes it suitable for low-voltage microprocessor cores. It also includes built-in thermal protection, current limiting, and an ERROR flag (open-drain) for power-rail monitoring, which is useful in multi-rail systems that need to detect a brown-out condition.
Typical applications include 1.8 V core supplies for low-voltage DSPs and microprocessors, post-regulation after a switching converter for noise-sensitive analog blocks, USB-powered portable devices, and 3.3 V-to-1.8 V point-of-load conversion in FPGA or microcontroller designs. The SOT-223 package provides a tab that can be soldered to a copper pour to extend continuous output current while keeping the footprint compact.
When designing with this part, observe the maximum input voltage of 7.0 V and confirm that VIN - VOUT remains above the dropout threshold under worst-case load. The ERROR pin requires an external pull-up resistor, and the SET/ADJ pin (on adjustable variants of the same family) must be tied through a resistor divider when used.
This page synthesizes distributor pricing for the LR1107G-18-AA3-A-R, real drop-in alternatives from the same Unisonic Technologies family and competitor catalogs, and practical PCB-level design notes not consolidated on any single manufacturer page.
드롭인 대체품: LR1107G-18-AA3-A-R — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LR1107G-15-AA3-A-R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LR1107G-25-AA3-A-R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LR1107G-33-AA3-A-R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LR1107G-50-AA3-A-R
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MIC5205-1.8YD5
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LR1107G-18-AA3-A-R 최대 정격 & 전기적 특성
| Regulator Type | Low Dropout (LDO) |
| Output Polarity | Positive |
| Output Voltage Type | Fixed |
| Output Voltage (Nominal) | 1.8 V |
| 입력 전압 범위 | 2.5 V to 7.0 V |
| 최대 출력 전류 | 600 mA |
| Quiescent (Ground) Current | 150 uA typical at 1 mA load |
| ERROR Flag (Power Good) | Yes (open-drain) |
| 열 차단 | Yes (built-in) |
| 전류 제한 | Yes (built-in) |
| 패키지 | SOT-223, 4-pin (AA3) |
| 실장 유형 | Surface Mount |
| 할로겐 프리 | Yes |
LR1107G-18-AA3-A-R 핀 구성
| 핀 1 | VIN — Input supply voltage (2.5 V to 7.0 V) |
| 핀 2 | GND — Ground |
| 핀 3 | VOUT — Regulated output (1.8 V nominal, 600 mA max) |
| 핀 4 | ERROR — Open-drain power-good flag; pull-up required |
| 핀 TAB | GND (tab) — Thermal/ground pad - solder to copper pour |
일반적인 애플리케이션
LR1107G-18-AA3-A-R 적합 용도: 6 애플리케이션s: 1.8V Microprocessor Core Supply, Post-Regulation After DC-DC Converter, USB-Powered Portable Device Rail, FPGA/SoC Point-of-Load Conversion, Industrial 5V-to-1.8V Interface Bridge, IoT Sensor Node Power.
1.8V Microprocessor Core Supply
The LR1107G-18-AA3-A-R delivers a fixed 1.8 V rail at up to 600 mA, which is well-matched to low-voltage microcontroller and DSP cores such as ARM Cortex-M0/M3 derivatives that specify a 1.8 V nominal VDD. Its 150 uA typical quiescent current keeps standby drain low, and the fast transient response tolerates the load steps typical of MCU wake/sleep transitions. Placed near the IC with a 1 uF ceramic input and 2.2 uF ceramic output capacitor, the regulator provides clean power while the SOT-223 tab is soldered to a small copper pour for thermal relief at full 600 mA. Compared with a switching regulator, the LDO adds no switching noise to the core rail.
추천
Post-Regulation After DC-DC Converter
After a switching buck regulator produces an intermediate rail (for example 3.3 V or 5.0 V), the LR1107G-18-AA3-A-R can serve as a post-regulator to deliver a clean 1.8 V to noise-sensitive analog or RF blocks. Because the LDO has at most a few hundred mV dropout at full load, it can be inserted between the buck output and the analog supply pin without significant efficiency penalty. The result is a low-noise 1.8 V rail on top of an efficient pre-regulation stage. The ERROR flag can be wired to a supervisory circuit to flag under-voltage conditions on the post-regulated rail.
추천
USB-Powered Portable Device Rail
The LR1107G-18-AA3-A-R accepts a +5 V USB bus input directly and steps it down to a stable 1.8 V for portable-product sub-systems such as Bluetooth modules, image sensors, or low-power MCUs. With a 7.0 V maximum input rating, the part tolerates USB inrush overshoot and hot-plug transients. Its SOT-223 footprint keeps the solution under 30 mm squared including input/output capacitors, and its 600 mA rating is sufficient to power a small SoC plus peripherals. Battery-powered designs benefit from the 150 uA quiescent current during standby, extending run time.
추천
FPGA/SoC Point-of-Load Conversion
Many modern FPGAs and SoCs require multiple point-of-load rails at different voltages, and 1.8 V is a common auxiliary or core-auxiliary voltage. The LR1107G-18-AA3-A-R can be placed near the device to deliver up to 600 mA with tight regulation, replacing a bulk regulator that would otherwise have to be shared across the board. The SOT-223 package allows tight placement to the load, minimizing PCB trace losses and improving transient response. Power-rail sequencing can be coordinated using the open-drain ERROR flag tied to a sequencer or supervisor.
추천
Industrial 5V-to-1.8V Interface Bridge
In industrial control and factory-automation boards, 5 V logic frequently has to interface with modern 1.8 V peripherals over SPI, I2C, or UART. The LR1107G-18-AA3-A-R can be tapped off the 5 V rail to provide a local 1.8 V for level shifters and modern sensors, eliminating the need for a separate intermediate converter. The 7.0 V input ceiling allows operation even on 24 V industrial buses after an upstream preregulator stage. The ERROR pin is useful for diagnostic monitoring in safety-critical industrial systems.
추천
IoT Sensor Node Power
Battery-powered IoT sensor nodes typically operate from a 3.3 V or 5 V supply and need a low-current 1.8 V rail for the radio transceiver or sensor front-end. The LR1107G-18-AA3-A-R delivers up to 600 mA with low quiescent current, allowing the node to support transmit bursts while keeping standby consumption low. Its small SOT-223 footprint is ideal for compact sensor modules, and the open-drain ERROR flag can wake a host MCU on under-voltage events. This makes the regulator well-suited to Wi-Fi, BLE, or sub-GHz sensor designs.
추천
추천 제품 요약
엔지니어링 참조 데이터: LR1107G-18-AA3-A-R — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | LR1107G-15-AA3-A-R | LR1107G-25-AA3-A-R | LR1107G-33-AA3-A-R | LR1107G-50-AA3-A-R | MIC5205-1.8YD5 |
|---|---|---|---|---|---|---|
| Package | SOT-223 (AA3) | SOT-223 (AA3) - same | SOT-223 (AA3) - same | SOT-223 (AA3) - same | SOT-223 (AA3) - same | SOT-223 - same |
| Brand | Unisonic Technologies | Unisonic Technologies | Unisonic Technologies | Unisonic Technologies | Unisonic Technologies | Microchip Technology |
| Output Voltage (VOUT) | 1.8 V | 1.5 V | 2.5 V | 3.3 V | 5.0 V | 1.8 V |
| Maximum Output Current | 600 mA | 600 mA | 600 mA | 600 mA | 600 mA | 150 mA |
| Input Voltage Range | 2.5 V to 7.0 V | 2.5 V to 7.0 V | 2.5 V to 7.0 V | 2.5 V to 7.0 V | 2.5 V to 7.0 V | 2.5 V to 16 V (wider) |
| ERROR Flag (Power Good) | Yes (open-drain) | Yes | Yes | Yes | Yes | No |
주요 차별점
- Wide input voltage headroom up to 7.0 V (vs MIC5205-1.8YD5)
- Built-in open-drain ERROR/power-good flag (vs MIC5205-1.8YD5)
- Higher output current at 600 mA (vs MIC5205-1.8YD5)
설계 노트
Estimated: at VIN = 5.0 V, VOUT = 1.8 V, and 600 mA load, the LR1107G-18-AA3-A-R dissipates approximately (5.0 - 1.8) * 0.6 = 1.92 W internally. The SOT-223 package's theta_JA on a standard 1 oz copper pour is roughly 60 C/W (the tab adds substantial thermal relief), implying a junction temperature rise of about 115 C above ambient at full load. Designers should use at least 0.5 square inch of continuous copper pour tied to the tab to keep Tj within safe limits at 600 mA; on minimally-poured boards the continuous current must be derated below 600 mA. The internal thermal-shutdown circuit will protect the die but is not a substitute for proper PCB layout.
Place the input bypass capacitor as close as possible to the VIN pin, and the output capacitor within 5 mm of the VOUT pin, using short traces to minimize parasitic inductance. The SOT-223 center tab is the main thermal path and must be soldered to a copper pour that is also grounded (the tab doubles as the ground reference for many SOT-223 LDO designs). For the ERROR flag, route the pull-up resistor to the load-side rail rather than to VIN so that the flag still asserts correctly during input-rail collapse.
Do not exceed the 7.0 V maximum input voltage - this is a low-voltage part and the internal pass element will not survive the 12 V or 24 V rails typical of industrial systems. For adjustable variants of the same family, do not leave the SET/ADJ pin floating; tie it to VOUT through the proper resistor divider or the output will rise to the internal reference. The LR1107G-18-AE3-3-R is NOT a drop-in replacement on a SOT-223 footprint because its 'AE3' code denotes the smaller SOT-89 package; verify the package code on every order.
규정 준수 정보
Halogen-free per Verified Web Data (Digchip listing). RoHS, REACH, lead-free, and conflict-minerals status not stated in the verified data and marked unknown. Not AEC-Q100 qualified - this is a commercial/industrial LDO.
