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NXP Semiconductors LD6836CX4/29P,315
- Part No.:
- LD6836CX4/29P,315
- Manufacturer:
- NXP Semiconductors
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
LD6836CX4/29P,315.pdf
- Description:
- IC REG LINEAR 2.9V 300MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:18,000
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Product details
Overview
LD6836CX4/29P,315 from NXP Semiconductors is a 2.9 V fixed-output, 300 mA ultra-low-dropout linear regulator in a 0.4 mm pitch WLCSP4 package (0.76 × 0.76 × 0.47 mm), featuring 90 mV dropout at full load, 30 µVRMS output noise (10 Hz–100 kHz), and auto-discharge functionality via integrated pull-down transistor (Rpd = 100 Ω). It serves as a precision local power supply for core logic and RF circuitry in space-constrained portable electronics.
For engineers reviewing the LD6836CX4/29P,315 datasheet, LD6836CX4/29P,315 pinout, LD6836CX4/29P,315 application, or LD6836CX4/29P,315 equivalent, this page delivers verified electrical specs, WLCSP4 terminal mapping, thermal resistance (130 K/W), shutdown timing (300 µs), and validated alternatives for low-noise, high-PSRR (55 dB @ 1 kHz) LDO selection in mobile SoC power domains.
Technical Context
The LD6836CX4/29P,315 implements a PMOS pass transistor architecture enabling ultra-low dropout operation down to 90 mV at 300 mA while maintaining stability with only 0.7 µF ceramic output capacitance. Its enable input (active HIGH, VIL ≤ 0.4 V, VIH ≥ 1.1 V) controls both regulation and auto-discharge-pulling OUT to GND via 100 Ω internal switch when disabled.
Designed for battery-powered systems, it integrates over-temperature shutdown (Tsd = 160 °C, 20 K hysteresis), current limiting (Isc = 600 mA), and 10 kV HBM ESD protection. The 30 µVRMS noise and 55 dB PSRR at 1 kHz support sensitive analog/RF loads without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 2.9 V ±3% over −40 °C to +85 °C ambient; enables direct powering of 2.8–3.0 V I/O domains without feedback tuning. |
| Dropout voltage | 90 mV typical at 300 mA; allows operation from 3.0 V input when battery drops to 3.0 V, extending usable runtime in Li-ion discharge profiles. |
| Quiescent current | 0.1 µA typical in shutdown mode; reduces system standby leakage in always-on sensor nodes or RTC power rails. |
| Output noise | 30 µVRMS (10 Hz–100 kHz); eliminates need for post-regulator LC filters in ADC reference or PLL supply paths. |
| PSRR | 55 dB at 1 kHz; suppresses switching noise from adjacent DC-DC converters feeding shared input rails. |
| Start-up time | 150 µs to 95% of 2.9 V; supports fast wake-up sequences in low-power microcontrollers and modems. |
| Thermal resistance | 130 K/W (junction-to-ambient, 2-layer PCB); requires minimal copper pour for full 300 mA continuous operation at +85 °C ambient. |
Pinout & Package
LD6836CX4/29P,315 uses a 4-bump Wafer-Level Chip-Scale Package (WLCSP4) with 0.4 mm pitch, dimensions 0.76 mm × 0.76 mm × 0.47 mm, and backside coating per /C variant designation (though /29P,315 implies standard CX4, not CX4/C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Supply ground | Primary return path for load current and internal bias; must connect to solid ground plane for noise immunity and thermal dissipation. |
| EN | Enable input (active HIGH) | Drives internal regulator and pull-down switch; logic HIGH ≥ 1.1 V enables output; LOW ≤ 0.4 V disables and activates auto-discharge. |
| OUT | Regulated output voltage | Delivers stable 2.9 V to load; internal 100 Ω pull-down engages during disable to rapidly discharge downstream capacitance. |
| IN | Regulator input voltage | Accepts 2.3–5.5 V input; requires ≥0.7 µF X7R ceramic capacitor close to pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated 100 Ω pull-down transistor on OUT enables rapid discharge of hold-up capacitors during sleep mode, reducing system wake-up latency and leakage. |
| Ultra-low noise output | 30 µVRMS noise (10 Hz–100 kHz) ensures clean power for RF transceivers and high-resolution ADCs without added filtering components. |
| High PSRR at 1 kHz | 55 dB rejection of ripple from upstream DC-DC converters prevents coupling of switching artifacts into noise-sensitive analog blocks. |
| Low quiescent current in shutdown | 0.1 µA max shutdown current minimizes battery drain in always-on applications such as real-time clocks and sensor hubs. |
| Robust thermal protection | 160 °C junction shutdown with 20 K hysteresis prevents thermal runaway during sustained overload or poor PCB heatsinking. |
Applications
| Smartphone Application Processor Core Rail | Bluetooth Low Energy (BLE) Radio Supply |
|---|---|
Use Scenario: Powers CPU/GPU cores requiring tightly regulated 2.9 V with fast transient response during burst-mode processing. IC Role / Device Role / Timing Role: Local LDO delivering low-noise, low-dropout power directly to SoC core domain; enables dynamic voltage scaling with <150 µs start-up. Use Value: Maintains 2.9 V ±3% under 300 mA load steps while rejecting noise from shared PMIC input rails, eliminating need for additional decoupling. | Use Scenario: Supplies BLE radio ICs where RF sensitivity demands ultra-low supply noise and rapid enable/disable cycling. IC Role / Device Role / Timing Role: Dedicated LDO with auto-discharge ensuring clean power-up/down sequencing and zero residual voltage on RF VDD during sleep. Use Value: 30 µVRMS noise and 55 dB PSRR prevent RX desensitization; 300 µs shutdown discharges RF bias caps to meet Bluetooth sleep timing requirements. |
| Digital Camera Image Sensor Bias Rail | Portable GPS Receiver LNA Supply |
Use Scenario: Provides quiet bias voltage to CMOS image sensor analog front-end, minimizing fixed-pattern noise. IC Role / Device Role / Timing Role: Low-noise LDO placed adjacent to sensor die; operates from partially discharged battery (down to 3.0 V input) using 90 mV dropout. Use Value: Enables full sensor performance across battery life without voltage headroom penalty; 0.7 µF output cap fits tight camera module layouts. | Use Scenario: Powers low-noise amplifier (LNA) in handheld GPS receivers where EMI immunity and thermal reliability are critical. IC Role / Device Role / Timing Role: Regulator with 10 kV HBM ESD protection and 130 K/W thermal resistance sustains operation in unshielded plastic enclosures near antennas. Use Value: Survives handling and board-level ESD events; maintains 2.9 V output during thermal stress up to +85 °C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LD6836CX4/29H | Same WLCSP4 package and 2.9 V output, but high-ohmic (3-state) output when disabled-no auto-discharge. | Suitable where output must float during disable (e.g., shared bus lines), not where rapid discharge is required. | Select LD6836CX4/29H only if system design prohibits pull-down action on OUT during disable. |
| TPS7A0529PDBVR | 2.9 V, 300 mA, SOT-23-5 package; 170 mV dropout (vs. 90 mV); 25 µVRMS noise; no integrated pull-down. | Larger footprint (2.9 × 1.6 mm vs. 0.76 × 0.76 mm); higher dropout limits low-VIN operation; requires external discharge circuit. | Choose TPS7A0529PDBVR only if WLCSP assembly capability is unavailable and board area permits SOT-23-5. |
Compared with LD6836CX4/29P,315, LD6836CX4/29H omits auto-discharge for floating outputs, while TPS7A0529PDBVR trades miniaturization and ultra-low dropout for broader vendor availability and simpler assembly-neither matches the combined WLCSP size, 90 mV dropout, and integrated 100 Ω pull-down of LD6836CX4/29P,315.
Availability
LD6836CX4/29P,315 is available at Aetrix Electronics and suitable for smartphone application processors, BLE radios, digital camera sensors, and portable GPS receivers requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for LD6836CX4/29P,315 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 specializing in secure connectivity solutions for automotive, industrial, and consumer applications, with leadership in RF, analog, and power management ICs.
The LD6836 series was designed specifically for ultra-miniature, low-noise power delivery in portable electronics-targeting space-constrained mobile SoC subsystems demanding sub-100 mV dropout, <1 µA shutdown current, and integrated auto-discharge.
FAQ
What is the nominal output voltage and tolerance of the LD6836CX4/29P,315?
The LD6836CX4/29P,315 provides a fixed 2.9 V output with ±3% tolerance over −40 °C to +85 °C ambient temperature and 1 mA to 300 mA load current. This specification is confirmed in Table 12 of the NXP datasheet and ensures compatibility with 2.8–3.0 V I/O standards without external feedback adjustment.
Does the LD6836CX4/29P,315 include an auto-discharge function, and how does it operate?
Yes, the LD6836CX4/29P,315 includes an integrated auto-discharge function. When the EN pin is driven LOW, the device disables regulation and activates a 100 Ω internal pull-down transistor on the OUT pin, rapidly discharging downstream capacitance. This behavior is explicitly defined for /P-suffixed variants in Sections 1.1 and 8 of the datasheet.
What is the minimum recommended output capacitance for stable operation of the LD6836CX4/29P,315?
The LD6836CX4/29P,315 requires a minimum 0.7 µF X7R ceramic capacitor on the OUT pin for stability, as specified in Table 13 and Section 10.1. The capacitor must have ±30% tolerance or better and ESR between 5 mΩ and 500 mΩ. Using 1.0 µF is recommended for optimal transient response and PSRR performance.
What is the thermal resistance (Rth(j-a)) of the LD6836CX4/29P,315, and how does it impact PCB layout?
The LD6836CX4/29P,315 has a typical junction-to-ambient thermal resistance of 130 K/W on a two-layer PCB, per Table 11. To achieve this rating, all four WLCSP4 bumps must connect to large copper areas-especially GND-and vias should link to inner ground/power planes. Avoid solder mask under the die to maximize heat conduction.
How does the enable threshold of the LD6836CX4/29P,315 interface with standard GPIOs?
The LD6836CX4/29P,315 EN pin has a guaranteed HIGH threshold ≥1.1 V and LOW threshold ≤0.4 V (Table 12), making it compatible with 1.8 V, 2.5 V, and 3.3 V GPIOs without level shifting. A 1.8 V MCU GPIO driving EN at 1.8 V ensures robust activation, while 0 V or <0.4 V guarantees full disable and auto-discharge engagement.
LD6836CX4/29P,315 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 4-XFBGA, WLCSP
- 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):
- 0.16V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- 55dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-WLCSP (0.76x0.76)
LD6836CX4/29P,315 FAQ
1.How can I place an order for LD6836CX4/29P,315 through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6836CX4/29P,315 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 LD6836CX4/29P,315 reliable?
The price and inventory of LD6836CX4/29P,315 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6836CX4/29P,315 is usually 5 days.
3.What payment methods are accepted for LD6836CX4/29P,315?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6836CX4/29P,315 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6836CX4/29P,315?
LD6836CX4/29P,315 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6836CX4/29P,315 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 LD6836CX4/29P,315?
For technical support, including LD6836CX4/29P,315 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6836CX4/29P,315 requirements.
6.How does Aetrix verify that LD6836CX4/29P,315 is sourced from the original manufacturer or authorized distributors?
All LD6836CX4/29P,315 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 LD6836CX4/29P,315 meets industry standards.
7.What is the process for return or replacement of LD6836CX4/29P,315?
All LD6836CX4/29P,315 units undergo pre-shipment inspection (PSI). If there is an issue with LD6836CX4/29P,315, 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 LD6836CX4/29P,315 part is unused and in its original packaging.
Return procedure for LD6836CX4/29P,315:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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