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STMicroelectronics LD59100PUR
- Part No.:
- LD59100PUR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
LD59100PUR.pdf
- Description:
- IC REG LINEAR POS ADJ 1A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,058
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Product details
Overview
LD59100PUR from STMicroelectronics is a 1 A adjustable ultra-low-dropout linear regulator with NMOS pass transistor, 200 mV typical dropout at full load, ±1 % output voltage accuracy, and reverse current protection. It operates from 2.2 V to 5.5 V input and delivers stable, low-noise power for noise-sensitive analog and mixed-signal circuits in portable and industrial systems.
For engineers reviewing the LD59100PUR datasheet, LD59100PUR pinout, LD59100PUR application, or LD59100PUR equivalent, this LDO's high PSRR (78 dB @ 100 Hz), fast load transient response, 1 μF minimum output capacitance requirement, and enable-controlled shutdown mode are critical for post-regulation POL, battery-powered subsystems, and telecom infrastructure power sequencing.
Technical Context
The LD59100PUR uses an NMOS topology to minimize RDS(on), enabling ultra-low dropout across its 1.2 V–5.5 V output range. Its internal 1.204 V reference feeds a feedback loop that supports remote sensing via the FB pin.
Stability is guaranteed with ≥1 μF ceramic output capacitors (X5R/X7R, 5 mΩ–1 Ω ESR); thermal shutdown (160 °C) and current limit (1.05–2.2 A) provide robust fault protection. The EN pin offers logic-level control with 0.5 V low / 1.7 V high thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1 A continuous - supports high-current digital cores or RF front-ends without external boost stages. |
| Dropout voltage | 200 mV typ. at 1 A - enables regulation from 2.4 V input to 2.2 V output, critical for Li-ion single-cell systems. |
| PSRR | 78 dB @ 100 Hz, 70 dB @ 100 kHz - suppresses switching noise from upstream DC/DC converters in mixed-power-rail designs. |
| Output accuracy | ±1 % typ. (±3 % max.) - ensures tight voltage margins for ADC references, PLL VCO supplies, and FPGA I/O banks. |
| Quiescent current | 140 µA typ. at 10 mA load - minimizes standby power in always-on sensor nodes and IoT edge devices. |
| Enable threshold | VEN(HI) = 1.7 V min. - compatible with 1.8 V GPIOs and open-drain microcontroller outputs without level-shifting. |
| Thermal resistance | RthJA = 55 °C/W (DFN8-3x3) - allows 1 A operation up to +85 °C ambient with minimal PCB copper area. |
Pinout & Package
LD59100PUR is housed in a thermally enhanced DFN8 (3 × 3 mm) package with exposed pad (EXP) for PCB ground connection. The 0.65 mm pitch, 8-terminal layout supports high-density routing and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Regulated output | Main power rail output; connects directly to load and output capacitor (≥1 µF). |
| 3 FB | Feedback reference | Sets output voltage via resistor divider (VOUT = 1.204 V × (1 + R1/R2)); enables remote sensing. |
| 4 GND | Analog/digital ground | Reference node for all internal circuitry; must be connected to EXP pad and low-impedance PCB ground plane. |
| 5 EN | Enable control input | Active-high logic interface; pulls device into <100 nA shutdown when driven <0.5 V. |
| 8 IN | Input supply | Accepts 2.2–5.5 V; requires ≥1 µF low-ESR ceramic capacitor placed adjacent to pin. |
| 2, 6, 7 NC | No connect | Unbonded die pads; must remain unconnected on PCB to avoid parasitic coupling or leakage paths. |
| EXP | Exposed thermal pad | Internally tied to GND; must be soldered to ≥200 mm² copper pour for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse output current protection | 0.1 µA max. reverse leakage when EN < 0.5 V and VIN < VOUT - prevents backfeed in multi-rail systems during power-down sequencing. |
| Fast load transient response | Sub-µs recovery from 10 mA ↔ 1 A step (Figure 23) - maintains voltage stability for burst-mode processors and RF transceivers. |
| Low-noise output | 27 × VOUT µVRMS (10 Hz–100 kHz) - meets stringent noise budgets for precision op-amps and high-resolution SAR ADCs. |
| Stable with small ceramics | Guaranteed stability with 1 µF X5R/X7R capacitors (5 mΩ–1 Ω ESR) - eliminates need for costly tantalum or polymer caps in space-constrained designs. |
| Adjustable output range | 1.204 V to (VIN − VDROP) - supports custom voltages including 1.5 V, 1.8 V, 2.5 V, 3.3 V using standard 1% resistors (Table 6). |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG monitor with ultra-low-power MCU, analog front-end, and Bluetooth LE radio operating from single Li-ion cell. IC Role / Device Role / Timing Role: Primary post-regulator supplying clean 1.8 V to ADC reference and 3.3 V to BLE SoC via dual-output configuration. Use Value: 200 mV dropout extends battery runtime by enabling regulation down to 2.0 V cell voltage; 78 dB PSRR isolates analog signal chain from digital switching noise. | Use Scenario: DIN-rail mounted programmable logic controller with isolated analog inputs, digital outputs, and Ethernet PHY. IC Role / Device Role / Timing Role: Local LDO for 3.3 V Ethernet PHY and 2.5 V DDR termination, fed from 5 V intermediate bus. Use Value: Reverse current protection prevents backfeed into 5 V bus during hot-swap of I/O modules; thermal shutdown protects against enclosure overheating in sealed enclosures. |
| 5G Small Cell Radio Units | Automotive ADAS Camera Power |
Use Scenario: Indoor pico-cell base station with RF transceiver, FEM, and fronthaul interface requiring low-phase-noise local supplies. IC Role / Device Role / Timing Role: Low-noise LDO for VCO bias and RF amplifier VDD, placed after buck converter stage. Use Value: 27 × VOUT µVRMS noise and 70 dB PSRR @ 100 kHz suppress phase jitter in 28 GHz mmWave synthesizers. | Use Scenario: Rear-view camera module with CMOS image sensor, ISP, and MIPI interface powered from vehicle 12 V via DC/DC. IC Role / Device Role / Timing Role: Final-stage regulator delivering 1.2 V core and 2.8 V I/O to image sensor, controlled by SoC enable signal. Use Value: EN pin compatibility with 1.8 V SoC GPIO enables precise power sequencing; 125 °C operating range meets AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B122MR-G | Fixed 1.2 V output; 150 mV dropout at 1 A; no EN or FB pins. | Lacks adjustability and enable control - suitable only for fixed-voltage, always-on use cases. | Select when board space is constrained and output voltage is invariant; not suitable for multi-rail or sequenced systems. |
| Analog Devices ADM7172ACPZ-R7 | 2 A rating; 125 µVRMS noise; 90 dB PSRR @ 100 Hz; 10-pin LFCSP. | Higher cost and larger footprint; superior noise/PSRR for RF and precision analog, but over-specified for general-purpose POL. | Choose for ultra-low-noise applications like radar receivers or high-speed DACs where LD59100PUR's 27×VOUT noise is insufficient. |
Compared with XC6210B122MR-G and ADM7172ACPZ-R7, the LD59100PUR uniquely balances adjustability, enable control, reverse current protection, and DFN8 compactness - making it optimal for cost-sensitive, multi-voltage, and hot-swap-capable embedded systems.
Availability
LD59100PUR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, 5G small cell radio units, and automotive ADAS camera power requiring stable component supply across extended temperature and lifecycle conditions.
Supply support for LD59100PUR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.
The LD59100 series belongs to ST's high-performance LDO portfolio, engineered specifically for noise-sensitive post-regulation in space-constrained, battery-operated, and thermally demanding environments.
FAQ
What is the minimum output capacitor required for stability?
The LD59100PUR is stable with any good-quality ceramic capacitor (X5R/X7R) of ≥1 µF and ESR between 5 mΩ and 1 Ω. Lower ESR values may cause ringing; capacitance must remain stable across temperature and bias voltage. No maximum value is specified if ESR stays within range.
Can the LD59100PUR be used in automotive applications?
Yes - it operates from −40 °C to +125 °C and includes thermal shutdown (160 °C) and reverse current protection. While not AEC-Q100 qualified, its electrical specs and ruggedness support non-safety-critical automotive subsystems like cameras and infotainment displays when validated per OEM requirements.
How does the FB pin function in adjustable configurations?
The FB pin senses the resistor divider output (VFB = 1.204 V typ.) between OUT and GND. Output voltage is set by VOUT = 1.204 V × (1 + R1/R2). Standard 1% resistors from 10 kΩ to 100 kΩ are recommended to minimize current draw while maintaining accuracy.
What happens during thermal shutdown?
When junction temperature reaches 160 °C, the LD59100PUR disables the pass transistor and forces output to zero. It remains latched off until temperature drops by ~20 °C hysteresis. During shutdown, quiescent current falls below 100 nA, and EN pin retains control priority.
LD59100PUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.192V
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- 0.5V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 130 µA
- Current - Supply (Max):
- 280 µA
- PSRR:
- 78dB ~ 58dB (100Hz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LD59100PUR FAQ
1.How can I place an order for LD59100PUR through Aetrix?
Please submit a Request for Quotation (RFQ) for LD59100PUR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LD59100PUR reliable?
The price and inventory of LD59100PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD59100PUR is usually 5 days.
3.What payment methods are accepted for LD59100PUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD59100PUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD59100PUR?
LD59100PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD59100PUR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LD59100PUR?
For technical support, including LD59100PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD59100PUR requirements.
6.How does Aetrix verify that LD59100PUR is sourced from the original manufacturer or authorized distributors?
All LD59100PUR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LD59100PUR meets industry standards.
7.What is the process for return or replacement of LD59100PUR?
All LD59100PUR units undergo pre-shipment inspection (PSI). If there is an issue with LD59100PUR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LD59100PUR part is unused and in its original packaging.
Return procedure for LD59100PUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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