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NXP Semiconductors LD6805K/29P,115
- Part No.:
- LD6805K/29P,115
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
LD6805K/29P,115.pdf
- Description:
- IC REG LIN 2.9V 150MA DFN1010C-4
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
LD6805K/29P,115 from NXP Semiconductors is a 2.9 V fixed-output, 150 mA low-dropout (LDO) regulator with ultra-high PSRR (75 dB at 1 kHz), 250 mV dropout at full load, and auto-discharge functionality enabled by an integrated pull-down transistor. It operates from 2.3 V to 5.5 V input and targets noise-sensitive analog/digital power rails in portable consumer electronics.
For engineers reviewing the LD6805K/29P,115 datasheet, LD6805K/29P,115 pinout, LD6805K/29P,115 application, or LD6805K/29P,115 equivalent, key selection criteria include its 40 µVRMS output noise, 150 µs startup time, 0.1 µA shutdown current, DFN1010C-4 (1 × 1 mm) package, and verified auto-discharge behavior for rapid system power-down sequencing.
Technical Context
The LD6805K/29P,115 implements a CMOS-based LDO architecture with internal voltage reference, error amplifier, and pass transistor-optimized for high PSRR via frequency-compensated feedback and low-noise biasing. Its enable circuitry drives the EN pin active-HIGH (VIH ≥ 1.1 V), triggering fast turn-on and controlled shutdown.
Unlike the /xxH variant, the /xxP suffix denotes inclusion of a dedicated low-ohmic pull-down switch (Rpd = 100 Ω typical) connected between OUT and GND during disable mode, ensuring rapid discharge of output capacitance without external components. This function is confirmed in Fig 2 and Table 8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.9 V ±3% over −40 °C to +85 °C; enables stable biasing of 2.8–3.0 V logic or RF front-end ICs. |
| Dropout voltage | 250 mV at 150 mA; allows operation with only 3.15 V input for 2.9 V output-critical for single-cell Li-ion or Li-poly systems. |
| PSRR | 75 dB at 1 kHz; suppresses switching noise from upstream DC-DC converters feeding sensitive analog circuits. |
| Output noise | 40 µVRMS (10 Hz–100 kHz); supports low-noise ADCs, audio codecs, and PLL power domains without added filtering. |
| Quiescent current | 0.1 µA typical in shutdown (VEN ≤ 0.4 V); extends battery life in always-on sensor or standby subsystems. |
| Startup time | 150 µs to 95% of 2.9 V (CL = 1 µF); meets fast wake-up timing requirements in mobile SoC power management. |
| Package | DFN1010C-4 (SOT1194-1), 1 × 1 × 0.55 mm; supports ultra-compact PCB layouts in smartphones and wearables. |
Pinout & Package
LD6805K/29P,115 uses the DFN1010C-4 (SOT1194-1) thermally enhanced plastic package with 4 terminals and exposed thermal pad (TAB) on the underside, recommended to be connected to GND for optimal thermal performance (Rth(j-a) = 250 K/W typical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output voltage node | Delivers 2.9 V to load; includes auto-discharge path to GND when disabled (pull-down transistor active). |
| 2 - GND | Power and reference ground | Common return for IN, OUT, EN, and TAB; must be low-impedance for noise immunity and thermal conduction. |
| 3 - EN | Enable control input | Active-HIGH logic interface (VIH ≥ 1.1 V); controls both regulation and auto-discharge activation/deactivation. |
| 4 - IN | Unregulated input supply | Accepts 2.3–5.5 V; requires local 1 µF ceramic capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor discharges output capacitance rapidly upon disable-eliminates need for external bleed resistors in battery-powered systems. |
| Ultra-low output noise | 40 µVRMS (10 Hz–100 kHz) enables direct powering of precision analog blocks without post-regulation filtering. |
| High PSRR at 1 kHz | 75 dB rejection of ripple from noisy DC-DC sources ensures clean supply for RF transceivers and high-speed interfaces. |
| Low shutdown current | 0.1 µA typical IQ in disable mode minimizes leakage current in long-duration sleep states (e.g., IoT edge nodes). |
| Thermally optimized package | DFN1010C-4 with exposed TAB achieves 250 K/W junction-to-ambient thermal resistance-supports 150 mA continuous load in space-constrained designs. |
Applications
| Smartphone Baseband Power | Digital Camera Sensor Bias |
|---|---|
|
Use Scenario: Supplying 2.9 V to baseband processor I/O banks and memory interfaces in LTE/5G handsets. IC Role / Device Role / Timing Role: Primary LDO delivering regulated, low-noise voltage with fast enable/disable for dynamic power gating. Use Value: Auto-discharge prevents residual voltage hold-up that could delay processor reset or cause boot failures during rapid power cycling. |
Use Scenario: Providing clean 2.9 V bias to CMOS image sensor analog front-end and ADC reference circuits. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO isolating sensor supply from noisy digital domain supplies. Use Value: 40 µVRMS noise and 75 dB PSRR directly improve image SNR and reduce fixed-pattern noise in low-light capture. |
| Wearable Health Monitor | Portable Media Player Audio Core |
|
Use Scenario: Powering ultra-low-power ECG/PPG analog signal chains and Bluetooth LE SoCs in compact wearables. IC Role / Device Role / Timing Role: Always-on LDO with sub-µA shutdown current supporting multi-week battery life in intermittent sensing modes. Use Value: 0.1 µA shutdown current and 150 µs startup enable responsive wake-from-sleep while minimizing quiescent drain. |
Use Scenario: Delivering stable 2.9 V to DACs, headphone amplifiers, and audio CODECs in MP3/Bluetooth players. IC Role / Device Role / Timing Role: Noise-critical LDO placed adjacent to audio ICs to avoid coupling from shared power rails. Use Value: Ultra-low 40 µVRMS noise eliminates audible hiss and preserves dynamic range in high-fidelity playback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A0529PDQNR | 2.9 V fixed, 200 mA, 170 mV dropout, 55 dB PSRR @ 1 kHz, SOT-563 package (1.6 × 1.6 mm) | Larger footprint, lower PSRR, no auto-discharge; requires external resistor for discharge if needed | Select when higher output current or lower dropout is prioritized over noise/PSRR and board area. |
| MCP1700T-2902E/TT | 2.9 V fixed, 250 mA, 600 mV dropout @ 250 mA, 45 dB PSRR @ 1 kHz, SOT-23-5 package | Higher dropout, lower PSRR, no auto-discharge, larger package; lacks integrated discharge path | Choose for cost-sensitive, non-noise-critical applications where 250 mA output suffices and board area is less constrained. |
Compared with TPS7A0529PDQNR and MCP1700T-2902E/TT, LD6805K/29P,115 delivers superior noise suppression (40 µVRMS vs. >100 µV), higher PSRR (75 dB vs. ≤55 dB), and built-in auto-discharge-making it uniquely suited for miniaturized, battery-operated systems demanding rapid power sequencing and ultra-clean analog supplies.
Availability
LD6805K/29P,115 is available at Aetrix Electronics and suitable for smartphone baseband power, wearable health monitor analog bias, and portable media player audio core applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LD6805K/29P,115 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 was designed specifically for ultra-miniaturized, battery-powered portable electronics-emphasizing ultra-low noise, high PSRR, and integrated auto-discharge to simplify power architecture in space- and energy-constrained devices.
FAQ
What is the exact output voltage tolerance of LD6805K/29P,115 across temperature and load?
The LD6805K/29P,115 delivers a nominal 2.9 V output with ±3% variation over −40 °C to +85 °C ambient temperature and 1 mA to 150 mA load current, as specified in Table 8 of the NXP product data sheet. At +25 °C and 1 mA load, tolerance tightens to ±0.5%. This accuracy ensures reliable operation of 2.8–3.0 V logic and analog ICs without external trimming.
Does LD6805K/29P,115 require an external discharge resistor for safe power-down?
No. LD6805K/29P,115 integrates a dedicated pull-down transistor (Rpd = 100 Ω typical) that actively discharges the output capacitor when the EN pin is driven LOW. This auto-discharge function eliminates the need for external bleed resistors, reducing BOM count and PCB area-confirmed in Fig 2 and Table 8 of the official NXP datasheet.
What is the minimum input voltage required for LD6805K/29P,115 to maintain regulation at full 150 mA load?
To sustain 2.9 V output at 150 mA, LD6805K/29P,115 requires a minimum input voltage of 3.15 V-calculated as VOUT + VDO = 2.9 V + 0.25 V. This 250 mV dropout enables efficient operation from single-cell Li-ion (3.0–4.2 V) or Li-poly batteries, even near end-of-discharge.
Can LD6805K/29P,115 be used with ceramic output capacitors smaller than 1 µF?
Yes-the LD6805K/29P,115 is stable with output capacitance as low as 0.7 µF (±30% tolerance, X7R dielectric), per Table 9 and Section 10.1. However, the recommended value is 1.0 µF to ensure optimal transient response and meet full temperature specification (−40 °C to +125 °C). Using <0.7 µF risks instability or excessive overshoot.
How does the thermal performance of LD6805K/29P,115 compare to standard SOT-23 LDOs?
LD6805K/29P,115's DFN1010C-4 package achieves a typical Rth(j-a) of 250 K/W-significantly better than typical SOT-23 packages (>350 K/W)-due to its exposed thermal pad (TAB) and optimized copper layout. When the TAB is soldered to a solid GND plane, it sustains 150 mA continuously at +85 °C ambient without derating, unlike most SOT-23 LDOs which require current reduction above +60 °C.
LD6805K/29P,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):
- 2.9V
- 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:
- DFN1010C-4
LD6805K/29P,115 FAQ
1.How can I place an order for LD6805K/29P,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6805K/29P,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/29P,115 reliable?
The price and inventory of LD6805K/29P,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/29P,115 is usually 5 days.
3.What payment methods are accepted for LD6805K/29P,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6805K/29P,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6805K/29P,115?
LD6805K/29P,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6805K/29P,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/29P,115?
For technical support, including LD6805K/29P,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6805K/29P,115 requirements.
6.How does Aetrix verify that LD6805K/29P,115 is sourced from the original manufacturer or authorized distributors?
All LD6805K/29P,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/29P,115 meets industry standards.
7.What is the process for return or replacement of LD6805K/29P,115?
All LD6805K/29P,115 units undergo pre-shipment inspection (PSI). If there is an issue with LD6805K/29P,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/29P,115 part is unused and in its original packaging.
Return procedure for LD6805K/29P,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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