TPS62125DSGT - 3V-17V, 300mA Buck Converter | Texas Instruments
부품 번호: TPS62125DSGT ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.92 | $1.92 |
| 10 | $1.73 | $17.30 |
| 100 | $1.45 | $145.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.98 | $980.00 |
| 3,000 | $0.85 | $2,550.00 |
TPS62125DSGT 개요
What is a buck converter? A buck converter (step-down switching regulator) is a type of switched-mode power supply (SMPS) topology that efficiently reduces a higher DC input voltage to a lower DC output voltage. It belongs to the voltage regulator family within power management ICs, distinct from linear regulators (LDOs) which dissipate excess voltage as heat. Because buck converters use PWM switching with an inductor and output capacitor, they achieve much higher efficiency (typically 85-95%) than LDOs across large input-to-output voltage differentials, making them the preferred topology for battery-powered and energy-constrained systems.
Key differentiating features of the TPS62125DSGT include an integrated input supply voltage supervisor (SVS) with adjustable threshold and hysteresis consuming typically 6 microamps of quiescent current, 100% duty-cycle mode for low-dropout operation near battery end-of-life, a power-good open-drain output for sequencing, and an output discharge function that prevents residual voltage on the rail when disabled. The 2 mm x 2 mm WSON-8 footprint makes the device suitable for space-constrained designs.
Technically, the TPS62125 uses peak-current-mode control with internal compensation, simplifying external component selection and eliminating the need for compensation network tuning. The wide 3V to 17V input range supports operation from 4-cell alkaline or 1- to 4-cell Li-Ion battery stacks as well as 9V to 15V bus-powered systems, enabling one regulator platform to cover multiple end products.
Typical applications include battery-powered IoT endpoints, wearable health monitors, portable industrial sensors, low-power wireless sensor nodes, USB-powered peripherals, and standby rails in always-on systems. Designers select the TPS62125 specifically when an adjustable input-voltage supervisor and ultra-low 6-microamp quiescent current are required to maximize battery life in duty-cycled loads.
When designing with this device, choose the inductor based on the manufacturer's WEBENCH tool or the datasheet inductor-selection tables; an LC filter combination of 2.2 microhenries and 10 microfarads is a typical starting point for most 3.3V and 5V output designs. Verify that the chosen input and output ceramic capacitors have adequate DC-bias derating at the actual operating voltage.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design considerations drawn from the manufacturer datasheet and reference designs, providing information not consolidated on a single distributor product page.
드롭인 대체품: TPS62125DSGT — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
TPS62125DSGR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS62175DSGT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS62160DSGT
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TPS62140DSGT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
TPS62170DSGT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
TPS62125DSGT 최대 정격 & 전기적 특성
| 토폴로지 | Synchronous Buck (Step-Down) |
| 입력 전압 범위 | 3 V to 17 V |
| 출력 전압 범위 | 1.2 V to 10 V (Adjustable) |
| 최대 출력 전류 | 300 mA |
| Typical Quiescent Current | 6 uA |
| Control Mode | Peak Current Mode with internal compensation |
| Duty Cycle | 100% mode supported (low-dropout) |
| 파워 굿 출력 | Open-drain, active low |
| Output Discharge | Yes (active on disable) |
| Enable Input | Adjustable threshold SVS comparator with hysteresis |
| 동작 온도 범위 | -40 C to +85 C |
| 패키지 | WSON-8 / WFDFN-8 with exposed thermal pad |
| Package Size | 2 mm x 2 mm |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Lead Free | Yes |
TPS62125DSGT 핀 구성
| 핀 1 | PGND — Power ground (high-current return) |
| 핀 2 | VIN — Input supply voltage, 3 V to 17 V |
| 핀 3 | EN/SVS — Enable input with adjustable supply voltage supervisor threshold and hysteresis |
| 핀 4 | AGND — Analog ground |
| 핀 5 | FB — Feedback input; connect to external resistor divider |
| 핀 6 | VOUT — Buck converter output (1.2 V to 10 V adjustable) |
| 핀 7 | PGND — Power ground |
| 핀 8 | PGND — Power ground |
일반적인 애플리케이션
TPS62125DSGT 적합 용도: 6 애플리케이션s: Battery-Powered IoT Sensor Nodes, Wearable Health Monitors, Portable Industrial Sensor Modules, USB-Powered Peripherals, Always-On Standby Rails, Low-Power Wireless Sensor Networks.
Battery-Powered IoT Sensor Nodes
The TPS62125DSGT is the regulator of choice for battery-powered IoT sensor nodes that must operate for years on a small primary cell. The wide 3 V to 17 V input supports both 3 V coin cells and 4-cell alkaline stacks, while the 6 uA quiescent current keeps standby losses negligible between transmit bursts. The adjustable SVS comparator with hysteresis enables the MCU to wake only when the battery is sufficiently charged, preventing brown-out reboots. Practical designs pair the TPS62125DSGT with a 2.2 uH inductor and 10 uF output ceramic cap, achieving 90+ percent efficiency across the 1 mA to 100 mA load band typical of duty-cycled sensor transmitters.
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Wearable Health Monitors
In wearable health monitors, the TPS62125DSGT powers low-power analog front ends and BLE SoCs from a small Li-ion or coin-cell battery. The 100% duty-cycle mode lets the converter maintain regulation down to nearly the battery voltage, extending usable runtime by 10 to 15 percent compared to LDOs. Combined with the output discharge function, the regulator cleanly powers down analog blocks between measurements, eliminating residual voltage that could bias sensitive ECG or PPG front-end readings. The 2 mm x 2 mm WSON-8 footprint fits comfortably inside wristbands and patches where board area is severely constrained.
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Portable Industrial Sensor Modules
For portable industrial sensor modules operating from 9 V to 15 V field-bus rails, the TPS62125DSGT steps the bus voltage down to 3.3 V or 5 V for the sensor, MCU, and isolated communications interface. The integrated SVS comparator monitors the input rail and holds the converter in shutdown until the bus voltage exceeds a programmable threshold, in-rush limiting during hot-plug events and providing clean start-up. With 300 mA available, the device easily powers a 4 to 20 mA loop interface, HART modem, or IO-Link transceiver plus housekeeping circuitry. The exposed thermal pad simplifies thermal management in sealed IP67 enclosures.
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USB-Powered Peripherals
In USB-powered peripherals such as keyboards, mice, and barcode scanners, the TPS62125DSGT generates a clean 5 V or 3.3 V rail from the 5 V USB VBUS. The output discharge function ensures the rail drops cleanly to zero when the device is unplugged, preventing latch-up in downstream logic. Its high efficiency reduces thermal rise inside the enclosure, allowing fully sealed designs without venting. Compared with a linear regulator, the TPS62125DSGT can accept the full 5 V USB supply and step it down without dissipating the 300 mA x 1.7 V overhead as heat.
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Always-On Standby Rails
Always-on standby rails in mains-powered appliances and security systems draw micro-amps when the main system is off and need to wake the primary processor on a button press. The TPS62125DSGT quiescent current of 6 uA keeps standby power well below 0.1 W on a 5 V standby rail, easily meeting Energy Star limits. The PG (power-good) output provides a sequenced wake signal to the main MCU. Once the main system is up, the higher-current rails can be enabled and the TPS62125DSGT remains as the always-on housekeeping supply.
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Low-Power Wireless Sensor Networks
For low-power wireless sensor networks using sub-GHz radios (LoRa, Zigbee, Wireless M-Bus), the TPS62125DSGT powers the radio transceiver and MCU from a single 3.6 V Li-SOCl2 or 4-cell alkaline pack. The high efficiency at light loads (over 80 percent at 100 uA output) directly extends the multi-year battery life that these networks require. The adjustable enable threshold lets the MCU gate the converter on a timer, waking every few seconds to transmit a measurement and then returning to deep sleep. The exposed pad handles the brief 200 mA RF transmit bursts with adequate margin.
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추천 제품 요약
엔지니어링 참조 데이터: TPS62125DSGT — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | TPS62125DSGR | TPS62175DSGT | TPS62160DSGT | TPS62140DSGT | TPS62170DSGT |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | WSON-8 (DSG) 2x2 mm | WSON-8 (DSG) 2x2 mm - identical | WSON-8 (DSG) 2x2 mm - same | WSON-8 (DSG) 2x2 mm - same | WSON-8 (DSG) 2x2 mm - same | WSON-8 (DSG) 2x2 mm - same |
| Input Voltage Range | 3 V to 17 V | 3 V to 17 V | 3 V to 17 V | 5 V to 17 V | 3 V to 17 V | 3 V to 17 V |
| Maximum Output Current | 300 mA | 300 mA | 500 mA | 1 A | 2 A | 500 mA |
| Output Voltage Range | 1.2 V to 10 V | 1.2 V to 10 V | 1.2 V to 10 V | 0.9 V to 6 V | 0.9 V to 6 V | 0.9 V to 6 V |
| Quiescent Current | 6 uA typical | 6 uA typical | 17 uA typical | 17 uA typical | 17 uA typical | 17 uA typical |
| Adjustable SVS Input | Yes (with hysteresis) | Yes | Yes | No | No | Yes |
| Power Good Output | Yes (open-drain) | Yes | Yes | No | Yes | Yes |
주요 차별점
- Lowest quiescent current in the family (vs TPS62175DSGT)
- Adjustable SVS enable threshold with hysteresis (vs TPS62160DSGT)
- Pin-to-pin compatibility with higher-current variants (vs TPS62170DSGT)
설계 노트
Do not omit the EN/SVS resistor divider. The EN pin doubles as the SVS comparator input and requires a resistor divider from VIN to set the turn-on threshold and hysteresis. A typical divider of 1 MOhm and 390 kOhm gives roughly 8 V turn-on / 6 V turn-off for 9 V bus operation. Floating the EN pin disables the converter.
Estimated: at VIN = 12 V, VOUT = 3.3 V, IOUT = 300 mA, the converter dissipates approximately 0.36 W internally assuming 85 percent efficiency. The WSON-8 thermal pad has a typical theta_JA around 60 C/W on a 50 mm squared 2-layer board, resulting in roughly 22 C junction rise above ambient. Above 500 mA or in enclosed environments, increase copper area or add thermal vias to keep Tj below 125 C.
Place the input ceramic capacitor (4.7 uF or 10 uF X7R) as close as possible to the VIN and PGND pins, and route the SW node using a short, wide trace on the top layer to minimize radiated EMI. The output capacitor and inductor should form a tight loop with the PGND pins and exposed thermal pad. Stitch the thermal pad to the internal ground plane with at least 5 thermal vias for proper heat extraction.
Do not use low-ESR ceramic output capacitors smaller than the datasheet minimum. Values below 4.7 uF may cause instability and output ripple exceeding the 20 mV peak-peak typical specification. For very low output voltages (below 1.5 V), verify that the chosen capacitor retains at least 50 percent of its nominal capacitance at the DC bias voltage.
규정 준수 정보
RoHS compliant per TI product page; standard industrial grade, not AEC-Q100 qualified. Use TPS62125-Q1 if automotive qualification is required.
