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STMicroelectronics LDL112PUR
- Part No.:
- LDL112PUR
- Manufacturer:
- STMicroelectronics
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LDL112PUR.pdf
- Description:
- IC REG LINEAR POS ADJ 1.2A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,799
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Product details
Overview
LDL112PUR from STMicroelectronics is an adjustable low-dropout linear regulator delivering up to 1.2 A output current with 300 mV typical dropout at 1 A, ±2.0% output voltage accuracy at 25 °C, and reverse current protection. It operates from 1.6 V to 5.5 V input and supports output voltages from 0.8 V to 5 V in 50 mV steps-ideal for USB-powered devices and battery-powered point-of-load regulation.
For engineers reviewing the LDL112PUR datasheet, LDL112PUR pinout, LDL112PUR application, or LDL112PUR equivalent, key selection considerations include its 35 µA typical quiescent current at no load, logic-controlled shutdown (<1 µA off-mode current), ceramic capacitor compatibility (1 µF COUT), thermal/overcurrent protection, and ADJ-pin-based remote sensing capability.
Technical Context
The LDL112PUR uses a PMOS pass transistor architecture enabling true reverse current blocking across all operating states-including EN high/low-and eliminating backfeed during fast transients or multi-rail fault conditions. Its internal 800 mV bandgap reference feeds an error amplifier controlling gate drive to maintain regulated output.
It implements dual-stage protection: current limiting (typ. 2 A short-circuit current) and thermal shutdown at 165 °C with 20 °C hysteresis. The ADJ pin allows programmable output via resistor divider (VOUT = 0.8 V × (1 + R1/R2)), supporting precision point-of-load adjustment with remote sensing capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.2 A guaranteed-supports high-current microcontroller cores or FPGA I/O banks without external boost. |
| Dropout Voltage | 300 mV typ. at 1 A-enables stable 3.3 V output from 3.6 V Li-ion battery down to end-of-discharge. |
| Quiescent Current | 35 µA typ. at no load-extends battery life in always-on sensor nodes or standby systems. |
| Output Accuracy | ±2.0% at 25 °C-meets tight tolerance requirements for ADC references or low-voltage logic rails. |
| Input Voltage Range | 1.6 V to 5.5 V-compatible with single-cell LiFePO₄, Li-ion, USB 5 V, and 3.3 V system rails. |
| Shutdown Current | <1 µA max.-ensures negligible leakage during deep sleep in portable medical or IoT edge devices. |
| Thermal Shutdown | 165 °C with 20 °C hysteresis-prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
LDL112PUR is available in DFN6 (3x3) mm, DFN6 (2x2) mm, SO8-batwing, and PPAK packages. The DFN6 (3x3) variant features an exposed pad connected to GND for enhanced thermal performance (RthJC = 10 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | LDO input supply | Accepts 1.6–5.5 V; must be decoupled with ≥1 µF ceramic capacitor near pin. |
| GND | Power and signal reference | Common return path; exposed pad (DFN/PPAK) must be soldered to GND plane for thermal integrity. |
| EN | Logic enable control | Active-high: VIH ≥ 1.4 V, VIL ≤ 0.35 V; floating prohibited-requires pull-up/down resistor. |
| ADJ | Feedback reference node | Internal 800 mV reference; connects to resistor divider for adjustable output voltage setting. |
| VOUT | Regulated output | Delivers up to 1.2 A; requires ≥1 µF ceramic output capacitor for stability per datasheet Figure 25. |
| NC | No-connect terminal | Not internally bonded-must remain unconnected; no routing or copper fill allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse current protection | Blocks backflow from VOUT to VIN in all states (EN high/low), preventing power rail contention in multi-source systems. |
| Output discharge function | Optional feature (not enabled by default)-actively discharges VOUT when EN goes low, avoiding residual voltage holdup. |
| Ceramic capacitor stability | Stable with 1 µF COUT (ESR < 10 mΩ); eliminates need for tantalum or aluminum electrolytic capacitors. |
| Wide output adjustability | 0.8 V to 5 V in 50 mV increments via external resistors-supports diverse core/I/O voltage requirements. |
| Thermal & current limiting | Internally limits output current to ~2 A and shuts down at 165 °C-no external protection circuitry required. |
Applications
| USB-Powered Peripherals | Battery-Powered Sensors |
|---|---|
|
Use Scenario: USB-C powered industrial dongle requiring clean 1.8 V for BLE SoC and 3.3 V for analog front-end. IC Role / Device Role / Timing Role: Primary LDO supplying dual regulated rails with reverse current isolation from host USB port. Use Value: 35 µA quiescent current extends runtime on bus-powered operation; 300 mV dropout ensures regulation down to 3.6 V input. |
Use Scenario: Wireless environmental sensor node powered by CR2032 coin cell (2.0–3.0 V range). IC Role / Device Role / Timing Role: Single-rail LDO generating stable 2.8 V for ultra-low-power MCU and MEMS sensor interface. Use Value: 1.6 V minimum input enables full battery utilization; <1 µA shutdown current preserves shelf life >10 years. |
| Low-Voltage Point-of-Load | Consumer Portable Audio |
|
Use Scenario: FPGA I/O bank requiring precise 1.2 V at up to 1.2 A with minimal voltage droop during burst activity. IC Role / Device Role / Timing Role: Local LDO placed adjacent to FPGA BGA package for lowest possible PSRR and transient response. Use Value: 1.2 A rating handles peak I/O switching current; ±2.0% accuracy maintains signal integrity margins. |
Use Scenario: Bluetooth headset with Li-ion battery (3.0–4.2 V) powering DSP, codec, and Class-D amplifier. IC Role / Device Role / Timing Role: Adjustable LDO configured for 1.1 V DSP core and 2.5 V codec supply using shared ADJ network. Use Value: Reverse current protection prevents battery drain when USB charging is active but headset is off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM112PWR | Fixed-output only (1.0–3.3 V), no ADJ pin; 250 mV dropout at 1 A; 50 µA IQ. | Lacks programmability-suitable only where fixed voltage suffices and lower dropout is critical. | Select when output voltage is static and board space favors smaller DFN2020-6 package. |
| MCP1826T-ADJE/DC | Adjustable (0.8–5.0 V), 400 mV dropout at 1 A, 90 µA IQ, no reverse current protection. | Higher quiescent current and missing reverse blocking limit use in multi-rail battery systems. | Choose if cost sensitivity outweighs reverse protection need and thermal margin permits higher dropout. |
Compared with TSM112PWR and MCP1826T-ADJE/DC, LDL112PUR uniquely combines adjustable output, sub-1 µA shutdown, reverse current blocking, and 300 mV dropout-making it optimal for dynamically powered, safety-critical portable designs where rail isolation and battery longevity are mandatory.
Availability
LDL112PUR is available at Aetrix Electronics and suitable for USB-powered peripherals, battery-powered sensors, and low-voltage point-of-load applications requiring stable component supply, long-term lifecycle support, and automotive-grade temperature resilience (−40 °C to 125 °C).
Supply support for LDL112PUR 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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The LDL112 series belongs to ST's high-efficiency analog power management portfolio, engineered specifically for ultra-low-power, reverse-blocking LDO applications in space-constrained portable and battery-operated systems.
FAQ
What output voltage range does LDL112PUR support, and how is it set?
LDL112PUR supports 0.8 V to 5.0 V output in 50 mV increments via external resistor divider on the ADJ pin. The formula is VOUT = 0.8 V × (1 + R1/R2), with recommended R1+R2 values between 10 kΩ and 50 kΩ to balance accuracy and quiescent current impact.
Does LDL112PUR require an output capacitor, and what type is recommended?
Yes-LDL112PUR requires a minimum 1 µF ceramic output capacitor (X5R/X7R, ≤10 mΩ ESR) for stability, as confirmed in Figure 25 of DS10321. Tantalum or aluminum electrolytics are not needed or recommended due to inherent ESR and aging limitations.
How does reverse current protection operate in LDL112PUR during EN = low?
When EN is pulled low, the internal PMOS pass transistor fully turns off, and both bulk and gate are switched to VOUT potential. This interrupts all conduction paths from VOUT to VIN-even if VOUT exceeds VIN by >100 mV-ensuring zero reverse leakage current.
Can LDL112PUR be used with input voltages below 1.8 V, and what is the minimum functional VIN?
Yes-LDL112PUR operates down to 1.6 V input, verified across temperature and load in Table 4. At 1.6 V VIN, it regulates outputs as low as 0.8 V (with sufficient headroom for dropout), making it suitable for single-cell LiFePO₄ (2.0–3.6 V) and emerging low-voltage battery chemistries.
LDL112PUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 6-WFDFN 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):
- 0.8V
- Voltage - Output (Max):
- 4.9V
- Voltage Dropout (Max):
- 0.6V @ 1.2A
- Current - Output:
- 1.2A
- Current - Quiescent (Iq):
- 70 µA
- Current - Supply (Max):
- 400 µA
- PSRR:
- 53dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Current
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LDL112PUR FAQ
1.How can I place an order for LDL112PUR through Aetrix?
Please submit a Request for Quotation (RFQ) for LDL112PUR 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 LDL112PUR reliable?
The price and inventory of LDL112PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDL112PUR is usually 5 days.
3.What payment methods are accepted for LDL112PUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDL112PUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDL112PUR?
LDL112PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDL112PUR 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 LDL112PUR?
For technical support, including LDL112PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDL112PUR requirements.
6.How does Aetrix verify that LDL112PUR is sourced from the original manufacturer or authorized distributors?
All LDL112PUR 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 LDL112PUR meets industry standards.
7.What is the process for return or replacement of LDL112PUR?
All LDL112PUR units undergo pre-shipment inspection (PSI). If there is an issue with LDL112PUR, 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 LDL112PUR part is unused and in its original packaging.
Return procedure for LDL112PUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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