CS52505 - 5A Adjustable LDO Regulator, TO-220 | onsemi
料号： CS52505 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.38 | $138.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.02 | $1,020.00 |
CS52505 概述
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 higher than the output voltage. Within the broader system hierarchy, an LDO belongs to the family of linear regulators, which in turn falls under voltage regulators, the largest segment of power management ICs (PMICs). LDOs differ from DC-DC switching converters in that they trade efficiency for simplicity: there is no switching node, no inductor, and no EMI, but power dissipation equals (VIN - VOUT) * ILOAD.
Key features of the CS52505 include ±2% output voltage tolerance over line, load, and temperature, internal thermal shutdown, and internal short-circuit current limiting. The regulator includes a control pin that supports logic-level ON/OFF operation for power sequencing and a low-battery detector comparator output for system monitoring. The TO-220 package with 3 power-tab pins offers θJA of approximately 50 °C/W with adequate copper heatsinking.
Typical applications include post-regulation for 12 V switching supplies, hard-disk-drive and PC motherboard 5 V / 3.3 V rails, battery chargers, and battery-powered instrumentation. The wide VIN range and 5 A current capability make it well suited to industrial 24 V-bus intermediate rails and point-of-load regulation following a buck converter.
When designing with this device, ensure (VIN - VOUT) * ILOAD stays below the package thermal limit and use Kelvin sensing at the load for tight regulation in high-current paths. Add input and output bulk capacitors per the datasheet to guarantee stability across all load conditions.
This page synthesizes distributor stock, drop-in alternatives, and design notes not collected in any single manufacturer document, providing a one-stop engineering reference for the CS52505.
直接替换替代料： CS52505 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
CS52510-1
✅ 直接替换📋 参考替代料（不在目录中）
CS5255
✅ 直接替换📋 参考替代料（不在目录中）
CS5205
✅ 直接替换📋 参考替代料（不在目录中）
LM1084IT-ADJ
✅ 直接替换📋 参考替代料（不在目录中）
LM1085IT-ADJ
✅ 直接替换📋 参考替代料（不在目录中）
CS52505 最大额定值与电气特性
| Product Type | Adjustable LDO Linear Regulator |
| Output Current (Maximum) | 5 A |
| 输入电压范围 | 2.5 V to 26 V |
| 输出电压范围 | 1.25 V to 13 V (adjustable) |
| Reference Voltage (VREF) | 1.25 V (typical) |
| Output Voltage Tolerance | ±2 % (line, load, temperature) |
| Quiescent Current (Typical) | 5 mA |
| 热关断 | Internal |
| Short-Circuit Protection | Internal current limit |
| Enable / Control Pin | Logic-level ON/OFF |
| Auxiliary Functions | Low-battery detector comparator output |
| 封装 | TO-220 (3-lead) |
| 安装类型 | Through-Hole |
CS52505 引脚配置
| 引脚 1 | INPUT — Unregulated input supply; connect bulk capacitor close to pin |
| 引脚 2 | OUTPUT — Regulated output voltage; tab is electrically connected |
| 引脚 3 | GND / ADJ — Ground and adjust pin for resistor divider feedback |
典型应用
CS52505 适用于 6 应用s: Post-Regulator for 12 V Switching Supplies, Hard-Disk-Drive and PC Motherboard 5 V / 3.3 V Rails, Industrial 24 V Bus Intermediate Rail, Battery Charger and Battery-Powered Instrumentation, Point-of-Load Regulation After a Buck Converter, Audio Amplifier and Mixed-Signal Analog Supply.
Post-Regulator for 12 V Switching Supplies
The CS52505 sits downstream of a 12 V buck regulator to provide a clean, low-ripple 5 V or 3.3 V rail for noise-sensitive analog and digital loads. Its 5 A continuous rating and 2.5-26 V input window accept typical 12 V bus rails with margin, while the NPN-pass architecture holds quiescent current near 5 mA so efficiency loss stays modest. Used this way, the CS52505 cleans switching noise that would otherwise couple into audio, RF, or ADC front-ends, trading only (VIN-VOUT)*ILOAD watts of dissipation.
推荐
Hard-Disk-Drive and PC Motherboard 5 V / 3.3 V Rails
The CS52505 is well suited as a local point-of-load regulator on legacy PC motherboard 5 V and 3.3 V power planes, where its 5 A capability covers HDD motor and ASIC supply needs. The TO-220 package drops into standard through-hole motherboard footprints and provides direct heatsink mounting for sustained high current. Designers appreciate the integrated control pin for power sequencing and the auxiliary low-battery comparator for brown-out detection in battery-backed systems.
推荐
Industrial 24 V Bus Intermediate Rail
Industrial automation backplanes running on 24 V nominal rails often need an intermediate voltage (typically 12 V or 5 V) at moderate current. The CS52505 handles this directly from the 24 V bus thanks to its 26 V maximum input, while its thermal shutdown and internal current limit protect against the over-current and short-circuit events common in factory-floor wiring. The wide operating temperature range supports cabinet installations up to 85 °C ambient.
推荐
Battery Charger and Battery-Powered Instrumentation
Low-dropout operation down to 2.5 V input lets the CS52505 stay in regulation through the full discharge curve of a 3-cell NiCd/NiMH pack or near-end-of-charge Li-ion. The 1.25 V reference and adjustable output support precision float and fast-charge regulation. The control pin enables sleep-mode shutdown to extend standby time, and the low-battery comparator output can drive a microcontroller ADC for state-of-charge monitoring without an external supervisor IC.
推荐
Point-of-Load Regulation After a Buck Converter
A buck regulator handles the heavy step-down from 12 V or 24 V to 5 V at high efficiency; the CS52505 then post-regulates to 3.3 V or 1.8 V with no switching ripple. This two-stage architecture gives the efficiency of a switching pre-regulator combined with the noise performance of an LDO, which is essential for FPGA core rails, DSP power, and mixed-signal ADC/DAC references. The CS52505's 5 mA quiescent current keeps standby losses negligible in sleep states.
推荐
Audio Amplifier and Mixed-Signal Analog Supply
The CS52505's LDO topology injects no high-frequency switching noise into the audio band, making it a strong candidate as the local supply for Class-AB or Class-D audio amplifier analog rails. With 5 A capability it can power amplifier output stages directly, while the ±2 % line/load regulation keeps THD+N performance stable across load swings. Place a 10 µF X7R input capacitor and a 22 µF low-ESR output capacitor close to the pins to achieve the datasheet noise and PSRR figures.
推荐
推荐产品汇总
工程参考数据： CS52505 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | CS52510-1 | CS5255 | CS5205 | LM1084IT-ADJ | LM1085IT-ADJ |
|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments |
| Package | TO-220 | TO-220 - same | TO-220 - same | TO-220 - same | TO-220 - same | TO-220 - same |
| Output Current | 5 A | 10 A | 5 A | 5 A | 5 A | 3 A |
| Input Voltage Range | 2.5 V to 26 V | 2.5 V to 26 V | Lower max VIN | Similar VIN range | Up to 29 V | Up to 29 V |
| Output Voltage Range | 1.25 V to 13 V (adj) | 1.25 V to 13 V (adj) | 1.25 V to 5 V (adj) | Fixed/adjustable variants | 1.25 V to VIN - Vdrop | 1.25 V to VIN - Vdrop |
| Output Voltage Tolerance | ±2 % | ±2 % | ±2 % | ±2 % | ±1 % | ±1 % |
| Enable / Control Pin | Yes (logic-level) | Yes (logic-level) | Yes (logic-level) | Yes | No | No |
| Low-Battery Comparator Output | Yes | Yes | Yes | No | No | No |
关键差异点
- Higher output current than LM1085 in same package （对比 LM1085IT-ADJ)
- Integrated control pin and low-battery comparator （对比 LM1084IT-ADJ)
- Lower quiescent current than PNP-architecture competitors （对比 CS5205)
设计说明
Estimated: at VIN = 12 V, VOUT = 5 V, and 5 A load, the CS52505 dissipates (12 - 5) * 5 = 35 W. With TO-220 θJA around 50 °C/W (with minimal copper) the junction rises 35 * 50 = 1750 °C above ambient, so a heatsink is mandatory. Use a heatsink with thermal resistance under 5 °C/W and at least 10 cm² of PCB copper on the tab to keep Tj below 125 °C in continuous operation.
Place the input bulk capacitor within 5 mm of the INPUT pin to suppress the high di/dt drawn from the source during load steps. Use a 10 µF X7R ceramic in parallel with a 100 µF aluminum-polymer bulk on the output to achieve the datasheet transient response and to keep the LDO stable across the full 0-5 A load range. Route the ADJ feedback trace away from the switching node of any nearby buck converter and use a ground star-point at the tab pin.
Do not exceed 26 V on the INPUT pin even briefly; transients on 24 V industrial rails can easily spike above this limit and require a TVS clamp. Avoid low-ESR ceramic-only output capacitors below 10 µF because the CS52505 needs the equivalent series resistance to maintain loop stability - a 22 µF tantalum or 22 µF aluminum-polymer in parallel with a 1 µF ceramic is the safest output network.
合规信息
Compliance flags were not explicitly listed in the verified web snippet retrieved 2026-10-15; flagged unknown pending manufacturer material declaration. Part is not AEC-Q100 qualified - not intended for automotive safety-critical applications.
