IPS521S - 5V High-Side Smart Power Switch 1.9A | Infineon
MPN： IPS521S ✗ 停產IPS521S 概覽
A high-side switch is a power-MOSFET or intelligent-power stage placed between the positive supply rail and the load, allowing the load to be turned on and off with a low-voltage logic signal referenced to ground. Compared with a low-side switch, a high-side topology breaks the load's return-path current when off, which is the preferred configuration for safety-critical switching of lamps, solenoids, relays, and motor windings where a low-side switch would leave dangerous voltages exposed to chassis ground. The IPS521S belongs to the broader category of Intelligent Power Switches (IPS), which integrate the power FET, gate driver, protection logic, and diagnostics into a single IC to replace discrete MOSFET-plus-driver designs.
Key features include logic-level CMOS-compatible input, isolated logic ground for noise-immune control, open-drain diagnostic feedback, low quiescent current in standby, and built-in active clamp for driving inductive loads such as solenoids, relays, and DC motors without external freewheeling diodes in many applications. The D2PAK package provides a low thermal resistance of approximately 50 C/W junction-to-ambient on a standard JEDEC test board, enabling continuous 1.9 A operation with adequate PCB copper area. Operating junction temperature spans -40 C to +150 C, suiting industrial and automotive underhood environments.
The IPS521S uses an N-channel MOSFET on the high side driven by an internal charge pump, allowing very low Rds(on) (tens of milliohms) and therefore low conduction loss. The integrated current-limit loop folds the output characteristic back when load current exceeds Ilim, protecting the FET and wiring, while the thermal sensor forces a shutdown-and-auto-restart cycle if Tj exceeds the protection threshold. Status feedback reports fault conditions (short circuit, open load, overtemperature) to the host microcontroller.
Typical applications include automotive body electronics (lamp drivers, seat heaters, mirror heaters, wiper controllers), industrial PLC discrete outputs, 24 V solenoid and valve drivers, DC motor drivers for small brushed loads, and any 5 V/12 V/24 V high-side switching where protection and diagnostics are required. When laying out the PCB, place the IPS521S on a minimum 1 square-inch copper pour to keep the junction temperature within safe limits at full 1.9 A load.
This page combines distributor pricing, parametric drop-in alternatives, and practical PCB design notes that the manufacturer datasheet alone does not surface, supporting faster sourcing decisions for engineers evaluating or replacing the IPS521S.
直接替換替代品，適用於 IPS521S — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： IPS521S （相同外形與佔位） — 差異在於 Mounting Type, Package.
IPS521
✅ 直接替換📋 參考替代品（不在目錄中）
IPS521G
✅ 直接替換📋 參考替代品（不在目錄中）
IPS521STRL
✅ 直接替換📋 參考替代品（不在目錄中）
IPS521S 最大額定值與電氣特性
| Product Type | Intelligent Power Switch (IPS), high-side N-channel MOSFET switch |
| 輸出數量 | 1 |
| 輸出配置 | High side |
| Continuous Output Current | 1.9 A |
| Operating Voltage Range | 5 V to 35 V (typical 5 V/12 V/24 V systems) |
| Input Logic Compatibility | CMOS / TTL logic level |
| Protection Features | Short-circuit current limit, over-temperature shutdown with auto-restart, ESD protection, active inductive clamp, open-load detection |
| Diagnostic Feedback | Open-drain status output |
| Logic Ground | Isolated logic ground pin |
| 工作接面溫度 | -40 C to +150 C |
| 封裝 | D2PAK (SMD-220, 5-lead) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Automotive Qualification | AEC-Q100 (per Infineon IPS521 family datasheet) |
| Original Manufacturer | International Rectifier (acquired by Infineon) |
IPS521S 腳位配置
| 腳位 1 | IN — Logic-level input (CMOS/TTL, controls output state) |
| 腳位 2 | LGND — Logic ground (isolated from power ground for noise immunity) |
| 腳位 3 | OUT — Power output (MOSFET drain to load) |
| 腳位 4 | STATUS — Diagnostic feedback (open-drain, reports fault conditions) |
| 腳位 5 | Vbb — Supply voltage (battery / power rail input) |
典型應用
IPS521S 適用於 6 應用s: Automotive Lamp Driver, Industrial 24V Solenoid and Valve Driver, DC Brushed Motor Driver (Low Power), Relay Replacement (Solid-State Switch), Body Control Module (BCM) Output, Battery-Powered Load Disconnect Switch.
Automotive Lamp Driver
The IPS521S is well-suited for driving 12 V automotive lamps including headlights, tail lamps, brake lights, and turn indicators. Its 1.9 A continuous current rating covers most bulb and high-brightness LED loads, and the integrated short-circuit current limit protects the wiring harness from catastrophic faults during lamp failures. The diagnostic status pin reports open-load conditions to the BCM when a bulb burns out, enabling dashboard warning features. The 35 V maximum supply rating tolerates 12 V automotive load-dump transients (per ISO 7637) with proper external protection.
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Industrial 24V Solenoid and Valve Driver
The IPS521S drives 24 V industrial solenoids, hydraulic valves, and pneumatic actuators directly from a PLC or industrial controller logic output. The active inductive clamp absorbs flyback energy when the solenoid is de-energized, eliminating the need for an external freewheeling diode in many cases. The over-temperature protection with auto-restart prevents thermal runaway in continuous-duty valve applications, and the logic-level CMOS input interfaces directly to 3.3 V or 5 V PLC outputs without level shifters.
推薦
DC Brushed Motor Driver (Low Power)
The IPS521S controls small brushed DC motors in applications such as window lifters, seat adjusters, mirror actuators, and small pumps up to 1.9 A. The high-side switching topology breaks the motor's ground return when off, a safety advantage over low-side drivers in chassis-referenced systems. Built-in short-circuit protection guards against motor stall currents, and the status feedback enables stall detection in the host firmware. A flyback diode across the motor terminals is recommended for high-inductance loads to supplement the internal active clamp.
推薦
Relay Replacement (Solid-State Switch)
The IPS521S serves as a solid-state replacement for automotive and industrial electromechanical relays, eliminating coil current draw, contact bounce, and mechanical wear. Its 1.9 A rating covers most signal-relay and small power-relay loads, and the CMOS-compatible logic input allows direct connection to microcontroller GPIO without driver transistors. The device's 5-35 V operating range supports both 12 V and 24 V relay coil replacement schemes, and the diagnostic pin reports load-failure conditions that electromechanical relays cannot self-detect.
推薦
Body Control Module (BCM) Output
The IPS521S was originally designed into automotive body control modules for distributed load switching including seat heaters, mirror heaters, door lock actuators, and wiper controls. Its AEC-Q100 automotive qualification, integrated protections, and diagnostic feedback fit the BCM's requirements for compact, fault-tolerant output stages. Modern BCMs use multi-channel high-side switch ICs (e.g., BTS series) for higher integration, but the IPS521S remains a reference for single-channel legacy or after-market modules.
推薦
Battery-Powered Load Disconnect Switch
The IPS521S can be used as a load disconnect switch between a battery and downstream circuitry in portable or backup-power systems. The logic-level enable input allows a microcontroller to power down sub-systems during sleep modes for battery conservation, while the diagnostic pin reports abnormal current draw that could indicate a fault. The wide 5-35 V input range supports single-cell Li-ion (via boost), 12 V lead-acid, and 24 V industrial battery packs with a single BOM item.
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推薦產品摘要
工程參考資料，適用於 IPS521S — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | IPS521 | IPS521G | IPS521STRL |
|---|---|---|---|---|
| Package | D2PAK (SMD-220, 5-lead) | TO-220 (5-lead) - different footprint | TO-220 (5-lead) - different footprint | D2PAK (SMD-220, 5-lead) - same |
| Brand | Infineon | Infineon | Infineon | Infineon |
| Continuous Output Current | 1.9 A | 1.9 A | 1.9 A | 1.9 A |
| Operating Voltage Range | 5 V to 35 V | 5 V to 35 V | 5 V to 35 V | 5 V to 35 V |
| Mounting Type | Surface Mount | Through-Hole | Through-Hole | Surface Mount |
| Integrated Protections | SC, OT, ESD, Active Clamp, Open Load | SC, OT, ESD, Active Clamp, Open Load | SC, OT, ESD, Active Clamp, Open Load | SC, OT, ESD, Active Clamp, Open Load |
| Diagnostic Status Output | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
主要差異化特點
- Fully-integrated single-chip high-side switch with diagnostics (對比Discrete MOSFET + gate driver)
- Isolated logic ground for noise-immune control (對比Standard high-side switches with shared ground)
- D2PAK surface-mount package with low thermal resistance (對比IPS521 in TO-220 through-hole)
設計說明
Estimated: at 1.9 A continuous load, Vbb=12 V, and Vload_drop=0.5 V, the IPS521S dissipates approximately 0.95 W in the D2PAK package. With a typical theta_JA of ~50 C/W on a JEDEC 1 sq-in test board, junction temperature rise is ~47 C above ambient. Provide at least 1 sq-in of copper pour beneath the tab and stitch thermal vias to inner planes to keep Tj below the 150 C maximum under worst-case 70 C ambient.
Keep the high-current OUT trace and the LGND return trace short and wide. Place a 100 nF ceramic bypass capacitor directly between Vbb (pin 5) and LGND (pin 2) to suppress switching transients. Route the STATUS pin trace away from the OUT node to avoid capacitive coupling that could cause false fault indications during normal operation.
Do not exceed 35 V on Vbb even transiently; load-dump events on 12 V automotive rails can exceed 40 V and require an external TVS clamp (e.g., 33 V or 36 V). The STATUS pin is open-drain and requires an external pull-up resistor (typically 10 kohm to 5 V). When driving inductive loads without an external freewheeling diode, ensure the active clamp energy rating is not exceeded for repetitive switching.
合規資訊
AEC-Q100 qualification per Infineon IPS family documentation. RoHS and REACH compliant per Infineon product declaration. Halogen-free status not explicitly confirmed in available data.
