TPS7A4700RGWR - 36V 1A Ultralow-Noise LDO | Texas Instruments
料号： TPS7A4700RGWR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.2727 | $6.27 |
| 10 | $4.5303 | $45.30 |
| 100 | $4.0076 | $400.76 |
| 500 | $3.8333 | $1,916.65 |
| 1,000 | $3.6591 | $3,659.10 |
TPS7A4700RGWR 概述
An LDO is a type of linear voltage regulator that maintains a stable output even when the input-to-output differential is small. In the power-management IC hierarchy, an LDO typically follows a switching converter or battery to generate a clean analog rail for noise-sensitive loads such as op-amps, ADCs, and PLL/VCO blocks.
Key features include 4.17 uVRMS output noise, high power supply rejection ratio (PSRR), and the unique ANY-OUT technique: the output voltage is user-programmable up to 20.5V via PCB layout connections without external feedback resistors or feed-forward capacitors, reducing component count and eliminating resistor thermal noise. Note this variant has no enable pin (choose TPS7A4701 for enable).
Technically, the bipolar architecture with precision bandgap reference delivers high PSRR, suppressing switching-converter ripple and making the device an ideal post-regulator after a DC-DC stage. The absent external divider shortens the sense path, lowering the noise floor further.
Typical applications include precision test and measurement instrumentation, RF transceiver PLL/VCO rails, audio DAC supplies, industrial 24V-bus sensor conditioning (36V rating provides headroom), and medical diagnostics.
Design consideration: verify the PCB routing pattern that sets the output voltage, since this variant has no external adjust pin; use adequate copper pour under the exposed pad for thermal relief. As of 2026-08-29, the part is stocked at DigiKey and Mouser.
直接替换替代料： TPS7A4700RGWR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TPS7A4700RGWR （相同外形与封装尺寸） ——差异在于 Enable Pin, Output Type, Package, Input Voltage Range, Output Noise.
快速对比工具——选择替代料号进行并排对比：
TPS7A4701RGWR
✓ 有现货
$3.2467 / 个
查看数据手册 →TPS7A4700QRGWRQ1
✓ 有现货
$3.65 / 个
查看数据手册 →TPS7A4701QRGWRQ1
✓ 有现货
$3.48 / 个
查看数据手册 →TPS7A3301RGWR
📋 参考替代料（不在目录中）
LT3045EDD
📋 参考替代料（不在目录中）
TPS7A4700RGWR 最大额定值与电气特性
| 输出类型 | Positive, adjustable (ANY-OUT programmable) |
| 输出电压范围 | 1.4 V to 20.5 V (ANY-OUT via PCB layout) |
| 最大输出电流 | 1 A |
| 输入电压范围 | 3 V to 36 V |
| 输出噪声 | 4.17 uVRMS (20 Hz to 100 kHz) |
| 使能引脚 | No (TPS7A4701 variant has enable) |
| 封装 | VQFN-20 (RGW) 5x5 mm with exposed pad |
| 安装类型 | Surface Mount |
| MSL 等级 | 2 (260C, 1 year) |
| RoHS 状态 | Compliant |
| Regulator Topology | LDO linear regulator (bipolar, bandgap reference) |
TPS7A4700RGWR 引脚配置
| 引脚 1 | IN — Input supply, 3V to 36V |
| 引脚 2 | IN — Input supply |
| 引脚 3 | EN/NC — No enable on TPS7A4700 (TPS7A4701 only) |
| 引脚 4 | NR/SS — Noise reduction / soft-start capacitor |
| 引脚 5 | GND — Ground |
| 引脚 6 | SENSE combos (ANY-OUT) — PCB-programmed output voltage sense pins |
| 引脚 7 | OUT — Regulated output, 1.4V to 20.5V |
| 引脚 8 | OUT — Regulated output |
| 引脚 9 | PG — [DATA_NEEDED: exact per-pin mapping from datasheet pin table] |
| 引脚 Pad | Thermal Pad — Exposed pad, connect to GND for thermal dissipation |
典型应用
TPS7A4700RGWR 适用于 6 应用s: RF Transceiver PLL/VCO Power Rails, Precision Test and Measurement Instrumentation, Audio DAC and Headphone Amplifier Supply, Industrial 24V Bus Sensor Conditioning, Medical Diagnostic Equipment, Automotive Infotainment and ADAS Analog Rails.
RF Transceiver PLL/VCO Power Rails
The TPS7A4700RGWR's 4.17 uVRMS noise and high PSRR make it ideal for powering PLL and VCO blocks in RF transceivers, where phase noise directly depends on supply cleanliness. Placed as a post-regulator after a DC-DC converter, it suppresses switching ripple before it reaches the oscillator tuning port. The 36V input also supports RF modules fed from higher-voltage industrial supplies. Use 10uF ceramic input/output capacitors with short sense routing to preserve the low noise floor.
推荐
Precision Test and Measurement Instrumentation
Bench instruments and automated test equipment need clean analog rails to preserve measurement accuracy at microvolt levels. The TPS7A4700RGWR's 4.17 uVRMS noise and bandgap-based reference support ADC/DAC reference supplies and op-amp rails without adding resistor-divider thermal noise thanks to the ANY-OUT topology. The 1A capacity covers multiple signal-chain blocks from one regulator, and the 36V input tolerates industrial supply variation during line-transient testing.
推荐
Audio DAC and Headphone Amplifier Supply
Audio DACs and headphone amplifiers demand supply rails with noise far below the audible threshold. The TPS7A4700RGWR delivers 4.17 uVRMS over 20 Hz to 100 kHz, and because ANY-OUT programming uses no feedback resistors, no divider thermal noise couples into the audio band. Its high PSRR rejects upstream switcher ripple that would otherwise appear as audible artifacts. A single 1A rail can power the DAC analog supply and output amplifiers together.
推荐
Industrial 24V Bus Sensor Conditioning
Industrial sensor front ends powered from 24V buses benefit from the TPS7A4700RGWR's 36V input rating, which leaves surge headroom above nominal bus voltage. A DC-DC converter steps down efficiently first, then this LDO post-regulates to a clean analog rail for signal conditioning amplifiers and ADCs, rejecting switching residue. Any-OUT programming allows rail voltages matched to sensor requirements without external resistors that add noise and BOM cost.
推荐
Medical Diagnostic Equipment
Medical imaging and diagnostic signal chains require extremely low supply noise to preserve physiological signal fidelity. The TPS7A4700RGWR's 4.17 uVRMS noise floor and high PSRR support analog front-end rails for biosignal amplifiers and precision converters. The 1A output powers multi-channel front ends from one regulator, simplifying rail count, while the low-dropout bipolar architecture maintains regulation even at low headroom, extending battery-powered portable instrument runtime.
推荐
Automotive Infotainment and ADAS Analog Rails
For automotive designs requiring AEC-Q100 qualification, the pin-compatible TPS7A4700QRGWRQ1 variant delivers identical 36V/1A/4.17 uVRMS performance with automotive-grade screening. It is suited to ADAS sensor module analog rails and infotainment audio supplies where 12V-battery transients demand high input ratings. Pair it with an automotive buck pre-regulator to maximize efficiency while preserving the low-noise post-regulation benefit.
推荐
推荐产品汇总
工程参考数据： TPS7A4700RGWR ——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 | TPS7A4701RGWR | TPS7A4700QRGWRQ1 | TPS7A4701QRGWRQ1 | TPS7A3301RGWR | LT3045EDD |
|---|---|---|---|---|---|---|
| Package | VQFN-20 (RGW) 5x5 mm | VQFN-20 (RGW) - same | VQFN-20 (RGW) - same | VQFN-20 (RGW) - same | VQFN-20 (RGW) - same | DFN-10 - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Input Voltage Range | 3V to 36V | 3V to 36V | 3V to 36V | 3V to 36V | -3V to -36V | 1.8V to 5.5V |
| Output Current | 1 A | 1 A | 1 A | 1 A | 1 A (negative) | 0.5 A |
| Output Noise | 4.17 uVRMS | 4.17 uVRMS | 4.17 uVRMS | 4.17 uVRMS | 6.5 uVRMS | 0.8 uVRMS |
| Output Voltage Range | 1.4V to 20.5V (ANY-OUT) | 1.4V to 34V (external divider) | 1.4V to 20.5V (ANY-OUT) | 1.4V to 34V (external divider) | -1.2V to -36V | 0V to 15V |
| Enable Pin | No | Yes (active-high) | No | Yes (active-high) | Yes | Yes |
关键差异点
- ANY-OUT resistor-free output programming （对比 TPS7A4701RGWR)
- High-voltage 36V input headroom （对比 LT3045EDD)
- Automotive drop-in option （对比 TPS7A4700QRGWRQ1)
设计说明
The ANY-OUT output voltage is set by which sense pins are connected to OUT in the PCB layout - follow the TPS7A47 datasheet programming table exactly and verify routing before fabrication, since errors cannot be fixed with component changes. Use 10uF ceramic input and output capacitors placed within 2-3 mm of the pins, with a 0.1uF parallel cap for high-frequency bypass.
At large VIN-VOUT differentials, dissipation is significant: 24V in, 5V out at 1A means 19W. The VQFN-20 exposed pad requires a solid GND copper pour (at least 1 square inch, multiple thermal vias) to keep junction temperature within limits. For high-dissipation designs, consider splitting the drop across a DC-DC pre-regulator plus this LDO.
This variant has no enable pin - if your design requires power sequencing, choose TPS7A4701RGWR (same footprint). Do not exceed 36V input including transients on industrial 24V buses. The NR/SS capacitor sets soft-start and noise bandwidth; do not omit it or output startup overshoot and excess noise may result.
合规信息
RoHS compliant per DigiKey/PartGenie listings. MSL 2 (260C, 1 year). AEC-Q100 qualification applies only to the Q1 variants (TPS7A4700QRGWRQ1).
