IRU1030CM - 3A Adjustable LDO Regulator TO-263 | Infineon
MPN: IRU1030CM ✓ Hoạt độngIRU1030CM Tóm tắt
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. LDOs sit within the broader hierarchy of linear regulators -> voltage regulators -> power management ICs -> semiconductors. They are valued for producing clean, low-noise rails because, unlike switching converters, they dissipate excess voltage as heat rather than chopping it, making them ideal for analog and post-regulation stages where switching noise is unacceptable.
Key specifications of the IRU1030CM include 3 A minimum output current, an adjustable output voltage range of 1.25 V to 5.5 V, low dropout voltage, and internal current-limit plus thermal-overload protection. The TO-263 surface-mount package exposes the die tab for direct PCB copper heatsinking, allowing the part to sustain multi-amp loads without an external heatsink in properly laid-out boards.
Architecturally, the IRU1030CM uses a PNP/NPN pass-element topology with an internal bandgap reference and feedback amplifier. The three-terminal connection (Input, Output, Adjust) keeps the external bill of materials minimal: only an input capacitor, an output capacitor, and two feedback resistors are required for a complete regulated supply. The wide SOA of the package and die enables sustained 3 A operation from typical 5 V and 12 V rails when proper thermal management is observed.
Typical applications for the IRU1030CM include post-regulation after a switching converter (where a clean secondary rail is needed), motherboard and graphics-card core/auxiliary supplies, industrial 12 V bus regulation, point-of-load regulation in distributed power architectures, and battery-powered equipment requiring a low-drop 3 A rail. It is also widely used as a cost-down replacement for legacy LT1085-class adjustable LDOs.
When designing with this device, ensure the PCB copper area under the TO-263 tab is sized to keep junction temperature within safe limits at maximum load. The input capacitor must be placed within 1 cm of the input pin to suppress input ringing, and the ESR of the output capacitor affects loop stability — follow the manufacturer's stability curve rather than assuming any ceramic output capacitor is interchangeable.
This page synthesizes distributor pricing, drop-in alternatives from IR/IRF, Infineon, and compatible sources, and practical design notes not consolidated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho IRU1030CM — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
IRU1030CD
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
IRU1030-33CM
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AS1360-AD
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
IRU1030CM Tỷ lệ tối đa & tính chất điện
| Manufacturer | Infineon Technologies (formerly International Rectifier) |
| Part Type | LDO Linear Regulator (Adjustable, Positive) |
| Cấu trúc | Three-terminal adjustable LDO |
| Kiểu đầu ra | Adjustable (Positive) |
| Số lượng đầu ra | 1 |
| Khoảng điện áp đầu ra | 1.25 V to 5.5 V (set by external resistor divider) |
| Minimum Output Current | 3 A |
| Reference Voltage (Vadj) | 1.25 V typical |
| Nhiệt độ mối nối hoạt động | 0 C to 150 C |
| Thermal Protection | Internal thermal shutdown |
| Giới hạn dòng điện | Internal current limit |
| Hộp | TO-263-4 (D2PAK, 3 functional leads + tab) |
| Kiểu lắp đặt | Surface Mount |
| Số chân | 3 (functional) + Tab |
Cấu hình chân IRU1030CM
| Chân 1 | ADJ — Adjust (feedback); connect to external resistor divider between OUT and GND |
| Chân 2 | OUT — Regulated output voltage; place output capacitor close to this pin |
| Chân 3 | IN — Input voltage supply; place input bypass capacitor close to this pin |
| Chân TAB | TAB — Exposed tab (electrically tied to IN); solder to PCB copper pad for heatsinking |
Ứng dụng tiêu biểu
IRU1030CM phù hợp cho 6 Áp dụngs: 5V Switching Converter Post-Regulator, 3.3V Motherboard Auxiliary Rail, Industrial 12V/24V Bus Point-of-Load, Battery-Powered Equipment Low-Drop Rail, Distributed Power Architecture Secondary Rail, Legacy 5V-Logic Replacement Power.
5V Switching Converter Post-Regulator
The IRU1030CM is widely used as a post-regulator following a 12 V or 24 V switching converter to produce a clean 5 V rail at 3 A. Its 1.25 V reference and adjustable output (1.25 V to 5.5 V) match the typical 5 V digital and analog rail, while its PNP/NPN pass element delivers much lower dropout than legacy NPN LDOs like the LM350. Placed downstream of a buck converter, it strips residual switching ripple, achieving >60 dB ripple rejection at low frequencies. Power dissipation at VIN=7 V, VOUT=5 V, IOUT=3 A is 6 W, so a substantial PCB copper pad under the TO-263 tab is required for thermal management.
Được đề xuất
3.3V Motherboard Auxiliary Rail
Motherboards and graphics cards use the IRU1030CM to derive a clean 3.3 V auxiliary rail from a 5 V bus. Its adjustable reference allows precise 3.30 V setting via R1/R2, and its 3 A capability covers memory, I/O, and clock-buffer loads. Compared to integrated switching solutions, the IRU1030CM produces zero switching noise, critical for clock-distribution and high-speed serializer/deserializer circuits where supply noise directly couples into jitter. The TO-263 package drops directly onto existing motherboard copper pours with no heatsink hardware.
Được đề xuất
Industrial 12V/24V Bus Point-of-Load
In industrial automation systems powered by 24 V or 12 V buses, the IRU1030CM provides a regulated 5 V or 3.3 V point-of-load supply for PLCs, sensor interfaces, and motor-control logic. Its wide input range accommodates the typical 18 V-32 V industrial rail while the 3 A current capability drives multi-chip loads. The TO-263 package is well-suited for DIN-rail-mounted power modules where space and heatsinking are constrained. Its internal current limit and thermal shutdown provide fault tolerance for harsh industrial environments with elevated ambient temperatures.
Được đề xuất
Battery-Powered Equipment Low-Drop Rail
The IRU1030CM's low-dropout PNP/NPN architecture makes it well-suited for battery-powered equipment where headroom between the battery voltage and the regulated output must be minimized to extend runtime. Dropping from a 3.6 V Li-ion cell to a 3.3 V load, the IRU1030CM operates in regulation down to VIN approximately equal to VOUT + 0.5 V at 3 A, versus 2.5 V for an NPN LDO. This lower dropout translates directly into additional usable battery capacity. Quiescent current draw (per datasheet) is the main consideration for battery life during light-load standby conditions.
Được đề xuất
Distributed Power Architecture Secondary Rail
In distributed power architectures where a primary bus converter feeds multiple secondary rails, the IRU1030CM generates intermediate voltages (2.5 V, 1.8 V) from a common 5 V intermediate bus. Its 1.25 V reference and wide adjust range make it flexible for legacy 5 V-rail-derivative designs. The 3 A output capability covers digital ASICs and FPGAs at typical distributed-power secondary currents. Its high bandwidth suppression of upstream switching ripple makes it ideal as a final-stage regulator in noisy distributed systems, especially when paired with upstream buck converters operating at 100 kHz to 1 MHz.
Được đề xuất
Legacy 5V-Logic Replacement Power
Designers maintaining legacy 5 V TTL and CMOS logic designs use the IRU1030CM to source clean 5 V rails at 3 A from 12 V or 24 V supplies. The adjustable output easily sets to 5.00 V with standard 1% resistors, and its PNP/NPN architecture gives full regulation across the entire 4.75 V-5.25 V TTL tolerance band. The TO-263 package is electrically equivalent to legacy TO-220 designs like the LM350 but offers lower-profile surface-mount assembly. For OEM service parts, the IRU1030CM is widely stocked at distributors as of 2026-10-08, ensuring long-term availability for legacy product support.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho IRU1030CM — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | IRU1030CD | IRU1030-33CM | LT1085CT | AS1360-AD | LM350T |
|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Analog Devices | ams (Sipex) | Texas Instruments |
| Package | TO-263 (D2PAK) | TO-263 (D2PAK) - same | TO-263 (D2PAK) - same | TO-220 - different footprint | TO-263 (D2PAK) - same | TO-220 - different footprint |
| Output Current | 3 A | 3 A | 3 A | 3 A | 3 A | 3 A |
| Output Voltage Range | 1.25 V to 5.5 V (adjustable) | 1.25 V to 5.5 V (adjustable) | 3.3 V fixed | 1.25 V to 5.5 V (adjustable) | 1.25 V to 5.5 V (adjustable) | 1.25 V to 33 V (adjustable) |
| Topology | PNP/NPN LDO | PNP/NPN LDO | PNP/NPN LDO | PNP/NPN LDO | PNP/NPN LDO | NPN Darlington |
| Reference Voltage | 1.25 V | 1.25 V | Fixed 3.3 V | 1.25 V | 1.25 V | 1.25 V |
| Thermal Protection | Yes (internal) | Yes (internal) | Yes (internal) | Yes (internal) | Yes (internal) | Yes (internal) |
| Operating Junction Temp | 0 C to 150 C | 0 C to 150 C | 0 C to 150 C | 0 C to 150 C | 0 C to 150 C | 0 C to 125 C |
Bảo phân biệt quan trọng
- TO-263 surface-mount package for modern SMT assembly (vsLM350T)
- Lower dropout voltage from PNP/NPN architecture (vsLM350T)
- Cost-optimized for 5V/3.3V digital rails (vsLT1085CT)
Ghi chú thiết kế
Estimated: at VIN=7 V, VOUT=5 V, IOUT=3 A, the IRU1030CM dissipates approximately (7-5) x 3 = 6 W. With a TO-263 theta_JA of approximately 30 C/W on a 1 sq inch copper pad, junction temperature rise is about 180 C above 25 C ambient, far exceeding the 150 C max. Required copper area for 5 V at 3 A from a 12 V supply (7 W dissipation) is at least 4 sq inches of 2 oz copper, or an external clip-on heatsink. Designers using the IRU1030CM must always verify junction temperature under worst-case load and ambient conditions.
Place the input bypass capacitor within 1 cm of the IN pin and the output capacitor within 1 cm of the OUT pin to suppress ringing and ensure stability. Use low-ESR ceramic or tantalum capacitors with values per the datasheet stability curve (typically 10 uF minimum output capacitance). The TO-263 tab must be soldered to a copper pour equal to or larger than the package thermal pad to ensure proper heatsinking; thermal vias to inner copper planes are recommended for high-dissipation designs.
Do not assume the IRU1030CM is pin-compatible with legacy LM350 designs - the LM350 uses TO-220 pinout (IN/OUT/ADJ on 3 pins in different positions) while the IRU1030CM uses TO-263 with ADJ/OUT/IN ordering. Swapping the ADJ and OUT pins will short the regulator's output to its feedback input, causing immediate overcurrent shutdown or destruction. Always cross-check pin assignments against the datasheet mechanical drawing before PCB layout.
For input voltages above approximately 7 V at 3 A load, the IRU1030CM is dissipating more than 5 W continuously, which approaches the practical limit of a TO-263 package without forced-air cooling. For higher input voltages or sustained full-load operation, consider using the IRU1030CM only as a post-regulator downstream of a switching pre-regulator that brings VIN closer to VOUT. This reduces total dissipation by 60-70 percent while preserving the LDO's clean output characteristic.
Thông tin tuân thủ
RoHS and REACH compliance status not confirmed in the provided data; Infineon's product page should be consulted for the latest compliance certificates. The part is not AEC-Q100 qualified (industrial/commercial application range).
