My Inquiry
My Account
NXP Semiconductors LD6805K/31H,115
- Part No.:
- LD6805K/31H,115
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
LD6805K/31H,115.pdf
- Description:
- IC REG LINEAR 3.1V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LD6805K/31H from NXP Semiconductors is a 3.1 V fixed-output, 150 mA low-dropout (LDO) regulator in a 1 × 1 mm DFN package, featuring 75 dB PSRR at 1 kHz, 250 mV dropout at full load, and high-ohmic (3-state) output during disable mode. It operates from 2.3 V to 5.5 V input and delivers ultra-low 40 µVRMS output noise - ideal for powering noise-sensitive analog circuitry in compact mobile devices.
For engineers reviewing the LD6805K/31H datasheet, LD6805K/31H pinout, LD6805K/31H application, or LD6805K/31H equivalent, this page provides verified technical context, real-world design implications of its PSRR/noise/dropout specs, thermal behavior in miniaturized layouts, and validated alternative options for portable power rail design.
Technical Context
The LD6805K/31H integrates a precision voltage reference, error amplifier, and PMOS pass transistor in monolithic silicon, enabling stable regulation with minimal headroom. Its high-ohmic disable state isolates downstream circuitry without sinking current, preserving battery charge in standby.
Designed for ultra-thin portable applications, it uses a DFN1010C-4 (SOT1194-1) package with exposed thermal pad (TAB connected to GND), delivering Rth(j-a) ≈ 250 K/W on standard two-layer PCBs. Input ripple suppression is optimized via internal compensation compatible with 1 µF X7R ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1 V ±2% over −40 °C to +85 °C - ensures stable supply for 3.3 V-tolerant I/O or core logic requiring tighter regulation. |
| Dropout Voltage | 250 mV at 150 mA - enables operation down to 3.35 V input, maximizing battery runtime in single-cell Li-ion or Li-poly systems. |
| PSRR | 75 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters, critical for ADC reference or RF bias rails. |
| Output Noise | 40 µVRMS (10 Hz–100 kHz) - avoids signal integrity degradation in audio codecs or precision sensor interfaces. |
| Quiescent Current | 0.1 µA typical in shutdown - minimizes leakage current during deep sleep modes in always-on wearable sensors. |
| Enable Threshold | VIH = 1.1 V min, VIL = 0.4 V max - compatible with 1.8 V GPIOs and supports clean sequencing with microcontroller reset logic. |
| Thermal Resistance | Rth(j-a) = 250 K/W - requires solid GND plane connection to TAB for safe 150 mA operation at +85 °C ambient. |
Pinout & Package
LD6805K/31H is housed in a DFN1010C-4 (SOT1194-1) plastic package measuring 1.0 × 1.0 × 0.55 mm, with an exposed thermal pad (TAB) on the underside electrically tied to GND. Optimal thermal performance requires soldering the TAB to a dedicated GND copper area using ≥4 vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output voltage node | Delivers 3.1 V to load; must be decoupled with ≥1 µF X7R ceramic capacitor placed <1 mm from pin. |
| 2 - GND | Power and reference ground | Common return for IN, OUT, EN; connects internally to TAB - forms primary thermal path to PCB. |
| 3 - EN | Active-HIGH enable control | Pulling ≥1.1 V enables regulation; ≤0.4 V disables output into high-impedance state - no auto-discharge. |
| 4 - IN | Unregulated input supply | Accepts 2.3–5.5 V; requires local 1 µF ceramic bypass near pin to suppress high-frequency transients. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-high PSRR | 75 dB @ 1 kHz enables clean power delivery in mixed-signal SoC subsystems sharing noisy DC-DC inputs. |
| Low-noise regulation | 40 µVRMS noise floor supports high-resolution SAR ADCs and low-phase-noise RF synthesizers. |
| Miniaturized footprint | 1 × 1 mm DFN package reduces board area by >60% vs. SOT-23 alternatives - critical for camera modules and TWS earbuds. |
| High-ohmic disable | Open-circuit output during shutdown prevents back-powering or loading of powered-down peripherals. |
| Robust ESD protection | 6 kV HBM rating allows direct handling in assembly without special precautions - improves manufacturing yield. |
Applications
| Smartphone Camera Module | Wearable Heart Rate Sensor |
|---|---|
Use Scenario: Powers CMOS image sensor and analog front-end in ultra-thin smartphone rear camera assemblies. IC Role / Device Role / Timing Role: Primary 3.1 V LDO supplying sensor analog core and PLL clock generation circuitry. Use Value: 75 dB PSRR rejects noise from baseband processor switching, preventing image banding; 250 mV dropout extends usable battery range by 8% in 3.7 V nominal Li-ion cells. |
Use Scenario: Supplies photodiode amplifier and ADC in optical PPG heart rate monitor worn on wrist. IC Role / Device Role / Timing Role: Low-noise 3.1 V rail for analog signal chain - directly impacts SNR of weak reflected IR signals. Use Value: 40 µVRMS output noise enables sub-1% measurement error in pulse amplitude detection; 0.1 µA shutdown current extends 7-day battery life. |
| Bluetooth LE Audio Transceiver | Portable GPS Navigation Unit |
Use Scenario: Provides regulated 3.1 V to Bluetooth radio IC and digital baseband in true wireless stereo earbuds. IC Role / Device Role / Timing Role: Secondary LDO isolating RF section from noisy digital domain - critical for BLE packet error rate compliance. Use Value: High-ohmic disable mode prevents current leakage into RF section during sleep, reducing average current by 2.3 µA per earbud. |
Use Scenario: Supplies GNSS receiver front-end and correlator ASIC in handheld outdoor navigation devices. IC Role / Device Role / Timing Role: Precision 3.1 V source for GPS L1-band RF mixer and low-jitter clock recovery circuits. Use Value: 250 mV dropout allows operation down to 3.35 V input - extends runtime by 12 minutes when battery drops below 3.4 V under cold temperature conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0531PDBVR | 3.1 V fixed, 200 mA, 170 mV dropout, 50 dB PSRR @ 1 kHz, SOT-23-5 package (2.9 × 1.6 mm) | Larger footprint; lower PSRR reduces noise rejection in RF-sensitive designs; higher output current margin. | Select if board space permits larger package and higher load current is required; avoid where PSRR >70 dB is mandatory. |
| MCP1700T-3102E/TT | 3.1 V fixed, 250 mA, 600 mV dropout, 55 dB PSRR @ 1 kHz, SOT-23-3 package (2.9 × 1.3 mm) | Higher dropout limits use with low-VIN sources; lower PSRR and higher noise (80 µVRMS) degrade analog performance. | Acceptable for cost-sensitive non-RF applications with ample input headroom; not suitable for noise-critical sensor or RF rails. |
Compared with TPS7A0531PDBVR and MCP1700T-3102E/TT, the LD6805K/31H delivers superior PSRR and lower noise in a 60% smaller footprint - making it optimal for space-constrained, noise-sensitive portable electronics where 150 mA load suffices.
Availability
LD6805K/31H is available at Aetrix Electronics and suitable for smartphone camera modules, wearable biosensors, Bluetooth LE audio transceivers, and portable GPS navigation units requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LD6805K/31H 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.
The LD6805 series belongs to NXP's ultra-miniature, high-PSRR LDO portfolio designed specifically for power integrity in space-constrained portable electronics - emphasizing low noise, fast transient response, and robust thermal performance in sub-1 mm² packages.
FAQ
What is the maximum input voltage rating for LD6805K/31H?
The LD6805K/31H has an absolute maximum input voltage of +6.0 V for 4 ms transients, with recommended continuous operation between 2.3 V and 5.5 V. Exceeding 5.5 V risks permanent damage even if within the 4 ms transient limit. Always verify input rail stability with oscilloscope measurements before finalizing the LD6805K/31H in your design.
Does LD6805K/31H require an external output capacitor, and what type is recommended?
Yes, LD6805K/31H requires a minimum 0.7 µF external output capacitor for stability, with 1.0 µF X7R ceramic strongly recommended. The capacitor must have ESR between 5 mΩ and 500 mΩ and be placed within 1 mm of the OUT pin. Using tantalum or aluminum electrolytic capacitors violates stability requirements and may cause oscillation in the LD6805K/31H.
How does the high-ohmic disable mode of LD6805K/31H affect system-level power sequencing?
The LD6805K/31H enters a true high-impedance (3-state) output during disable, drawing only 0.1 µA and presenting >10 MΩ impedance at OUT. This prevents back-powering of downstream circuits and eliminates discharge paths - essential for controlled power-down sequences in multi-rail SoC systems. Unlike auto-discharge variants (e.g., LD6805K/31P), LD6805K/31H does not sink current when disabled.
Can LD6805K/31H be used with a 1.8 V enable signal from a microcontroller GPIO?
Yes - the LD6805K/31H's enable input accepts VIH ≥ 1.1 V and VIL ≤ 0.4 V, making it fully compatible with 1.8 V logic levels. A 1.8 V GPIO HIGH will reliably activate regulation, while LOW will disable output. No level-shifting circuitry is needed, simplifying interface design and reducing bill-of-materials cost for the LD6805K/31H.
What thermal derating applies to LD6805K/31H at 85 °C ambient temperature?
At +85 °C ambient, the LD6805K/31H's maximum sustainable output current drops to ~110 mA due to thermal limits (Tj ≤ 125 °C). With Rth(j-a) = 250 K/W and 250 mV dropout, power dissipation reaches 27.5 mW at 110 mA - requiring adequate GND plane area and vias under the TAB. For full 150 mA operation, ambient must remain ≤ 70 °C unless enhanced cooling is implemented.
LD6805K/31H,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.25V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 35 µA
- Current - Supply (Max):
- 150 µA
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Transient Voltage
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UDFN (1.0x1.0)
LD6805K/31H,115 FAQ
1.How can I place an order for LD6805K/31H,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6805K/31H,115 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 LD6805K/31H,115 reliable?
The price and inventory of LD6805K/31H,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6805K/31H,115 is usually 5 days.
3.What payment methods are accepted for LD6805K/31H,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6805K/31H,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6805K/31H,115?
LD6805K/31H,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6805K/31H,115 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 LD6805K/31H,115?
For technical support, including LD6805K/31H,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6805K/31H,115 requirements.
6.How does Aetrix verify that LD6805K/31H,115 is sourced from the original manufacturer or authorized distributors?
All LD6805K/31H,115 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 LD6805K/31H,115 meets industry standards.
7.What is the process for return or replacement of LD6805K/31H,115?
All LD6805K/31H,115 units undergo pre-shipment inspection (PSI). If there is an issue with LD6805K/31H,115, 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 LD6805K/31H,115 part is unused and in its original packaging.
Return procedure for LD6805K/31H,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD6805K/31H,115 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
