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NXP Semiconductors LD6935L/3318PX
- Part No.:
- LD6935L/3318PX
- Manufacturer:
- NXP Semiconductors
- Package:
- 8-XFDFN Exposed Pad
- Datasheet:
-
LD6935L/3318PX.pdf
- Description:
- IC REG LINEAR 1.8V/3.3V 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,690
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Product details
Overview
LD6935L/3318PX from NXP Semiconductors is a dual-channel, fixed-output low-dropout (LDO) voltage regulator delivering 300 mA per channel with 240 mV dropout at full load, 3.3 V and 1.8 V nominal outputs, and 80 dB PSRR at 1 kHz - designed for power rail sequencing in compact portable electronics.
For engineers reviewing the LD6935L/3318PX datasheet, LD6935L/3318PX pinout, LD6935L/3318PX application, or LD6935L/3318PX equivalent, this page provides verified electrical specifications, thermal behavior, enable timing, output discharge mode, and package-level layout guidance for smartphone and tablet power subsystem design.
Technical Context
The LD6935L/3318PX integrates two independent LDOs with separate enable inputs (EN1/EN2), soft-start circuitry limiting inrush current, and auto-discharge functionality on both outputs - implemented via internal 100 Ω pull-down resistors when disabled. It operates across 1.75 V to 5.5 V input range and supports stable regulation down to 1.8 V output.
Its DFN1612-8 (SOT1225) package features an exposed thermal pad (TAB) tied to GND, enabling efficient heat dissipation with Rth(j-a) = 135 K/W on standard 2-layer PCBs. The device includes overcurrent and thermal shutdown protection with 160 °C trip point and 20 K hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V (OUT1), 1.8 V (OUT2) - fixed, factory-trimmed values requiring no external feedback components |
| Max Output Current | 300 mA per LDO - supports simultaneous dual-rail loads such as application processor core + I/O domain |
| Dropout Voltage | 240 mV at 300 mA - enables high-efficiency operation even with tight input-output margins (e.g., 3.54 V IN → 3.3 V OUT) |
| PSRR | 80 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input |
| RMS Output Noise | 60 µV (10 Hz–100 kHz) - ensures clean supply for noise-sensitive analog circuits like ADCs or RF front-ends |
| Quiescent Current | 35 µA per LDO (typ.) at zero load - minimizes battery drain during system standby |
| Startup Time | 150 µs to 95% of nominal output - enables fast wake-up sequences without excessive delay in power management firmware |
Pinout & Package
LD6935L/3318PX uses the DFN1612-8 (SOT1225) leadless plastic package: 1.6 × 1.2 × 0.4 mm body with exposed thermal pad (TAB) on underside, rated for −40 °C to +85 °C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Supply ground reference | Primary ground return path for both regulators; must be connected to PCB ground plane for thermal and EMI performance |
| OUT1 (Pin 2) | LDO1 regulated output | Delivers 3.3 V at up to 300 mA; auto-discharged via 100 Ω internal resistor when EN1 = LOW |
| OUT2 (Pin 3) | LDO2 regulated output | Delivers 1.8 V at up to 300 mA; auto-discharged via 100 Ω internal resistor when EN2 = LOW |
| GND (Pin 4) | Supply ground reference | Secondary ground connection; improves current sharing and reduces ground bounce between LDO channels |
| EN2 (Pin 5) | LDO2 enable control | Active-HIGH logic input (VIH ≥ 1.1 V); controls startup/shutdown timing independently of EN1 |
| IN2 (Pin 6) | LDO2 input supply | Accepts 1.75–5.5 V input; decoupled by ≥0.7 µF ceramic capacitor to ensure stability |
| IN1 (Pin 7) | LDO1 input supply | Accepts 1.75–5.5 V input; electrically isolated from IN2 to support split-input architectures |
| EN1 (Pin 8) | LDO1 enable control | Active-HIGH logic input (VIH ≥ 1.1 V); initiates soft-start sequence for OUT1 upon assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Separate IN/EN/OUT pins per channel allow asynchronous power sequencing and fault isolation |
| Auto-discharge output | 100 Ω internal pull-down on each OUT pin ensures rapid voltage decay (<300 µs) when disabled - critical for safe power-down in multi-rail systems |
| Ultra-low quiescent current | 0.1 µA max in shutdown mode - extends battery life in always-on sensor or modem subsystems |
| High PSRR & low noise | 80 dB rejection at 1 kHz + 60 µV RMS noise enables direct powering of RF transceivers and precision analog blocks |
| Thermally robust DFN package | 0.4 mm height and exposed thermal pad support high-density mobile PCB layouts while maintaining Rth(j-a) ≤135 K/W |
Applications
| Smartphone Application Processor Core | Tablet Camera Module Power |
|---|---|
Use Scenario: Supplying 1.8 V I/O domain and 3.3 V peripheral interface for application SoC during active and suspend states. IC Role / Device Role / Timing Role: Dual-rail LDO providing tightly regulated, low-noise, and sequenced power with independent enable control for core and I/O domains. Use Value: Eliminates need for discrete sequencing ICs; 240 mV dropout preserves battery runtime; 150 µs startup enables sub-millisecond wake-up from deep sleep. | Use Scenario: Powering image sensor, ISP, and autofocus actuator in high-resolution mobile cameras with strict EMI and transient response requirements. IC Role / Device Role / Timing Role: Low-noise dual LDO delivering clean 3.3 V (sensor analog) and 1.8 V (digital interface) rails with synchronized or staggered enable timing. Use Value: 60 µV RMS noise prevents image artifacts; auto-discharge prevents latch-up during hot-plug camera insertion; PSRR rejects DC-DC ripple from main PMIC. |
| Portable Media Player Audio Codec | Mobile Internet Device RF Front-End |
Use Scenario: Providing bias voltage to stereo DAC/ADC and headphone amplifier in battery-powered audio players. IC Role / Device Role / Timing Role: Dual LDO supplying 3.3 V (analog supply) and 1.8 V (digital core) with ultra-low noise and fast transient response. Use Value: 60 µV RMS noise ensures >100 dB SNR; 80 dB PSRR isolates audio path from noisy digital subsystems; 300 mA per rail supports Class AB headphone drive. | Use Scenario: Delivering stable 3.3 V and 1.8 V supplies to LTE/Wi-Fi transceiver ICs in compact IoT gateways and hotspots. IC Role / Device Role / Timing Role: Dual LDO acting as post-regulator for RF ICs requiring low-noise, high-PSRR, and fast enable/disable for TDD/FDD mode switching. Use Value: 240 mV dropout maximizes efficiency under varying battery voltage; 150 µs startup aligns with RF IC's fast state transitions; thermal protection prevents overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B3318MR-G | Same 3.3 V/1.8 V dual fixed outputs, but 200 mV dropout at 300 mA; no auto-discharge; SOT-26 package (2.8 × 2.9 × 1.3 mm) | Lacks integrated pull-down; requires external discharge FETs for safe power-down sequencing | Choose when board space allows larger SOT-26 and discharge control is handled externally |
| Richtek RT9013-3318GJ6 | 3.3 V/1.8 V dual LDO with 250 mV dropout; includes enable delay function; WDFN-8 (1.6 × 1.6 × 0.55 mm) package | Delay circuit built-in (no -PD suffix required); slightly taller package limits ultra-thin designs | Choose when precise LDO2 enable delay is needed without modifying enable signal routing |
Compared with XC6210B3318MR-G and RT9013-3318GJ6, LD6935L/3318PX offers the lowest profile (0.4 mm), guaranteed auto-discharge, and best-in-class PSRR - making it optimal for space-constrained, multi-rail mobile devices requiring robust power sequencing and minimal BOM count.
Availability
LD6935L/3318PX is available at Aetrix Electronics and suitable for smartphone, tablet, and portable media player designs requiring stable component supply, consistent dual-rail LDO performance, and RoHS-compliant packaging.
Supply support for LD6935L/3318PX 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 electronics markets.
The LD6935 series belongs to NXP's power management portfolio, engineered specifically for ultra-compact, high-efficiency dual-rail regulation in battery-powered portable devices with stringent noise and sequencing requirements.
FAQ
What output voltages does the LD6935L/3318PX provide?
The LD6935L/3318PX provides fixed nominal output voltages of 3.3 V on OUT1 and 1.8 V on OUT2. These values are factory-trimmed and do not require external resistive feedback networks. The device is part of the LD6935L/3318P variant family, confirmed in Table 4 of the NXP datasheet as having pull-down (auto-discharge) output behavior for both channels.
Does the LD6935L/3318PX include auto-discharge functionality?
Yes, the LD6935L/3318PX includes auto-discharge on both outputs, implemented via internal 100 Ω pull-down resistors. When either EN1 or EN2 is driven LOW, the corresponding OUT pin discharges to near-GND within 300 µs (tsd(reg)). This behavior is explicitly defined for the "-P" suffix variants in Tables 4 and 8 of the NXP datasheet and applies directly to LD6935L/3318PX.
What is the maximum input voltage rating for the LD6935L/3318PX?
The LD6935L/3318PX supports a recommended operating input voltage range of 1.75 V to 5.5 V on both IN1 and IN2 pins. Its absolute maximum input voltage is +6.0 V for transient conditions up to 4 ms, as specified in Table 6 (Limiting Values) of the NXP datasheet. Operation beyond 5.5 V is not recommended for continuous use.
How does the LD6935L/3318PX handle thermal overload?
The LD6935L/3318PX incorporates thermal shutdown protection that activates at 160 °C junction temperature (Tsd) with 20 K hysteresis (Tsd(hys)). Once triggered, the device disables both LDOs until junction temperature falls below 140 °C. This behavior is documented in Table 9 (Electrical Characteristics) and applies identically across all LD6935L/xxxxP variants including LD6935L/3318PX.
Is the LD6935L/3318PX compatible with Pb-free reflow processes?
Yes, the LD6935L/3318PX is qualified for Pb-free soldering with a peak reflow temperature of 230–260 °C (Table 18). It withstands at least three reflow cycles per the profile in Figure 31, and its DFN1612-8 package meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for surface-mount assembly.
LD6935L/3318PX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V, 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.24V @ 300mA (Typ), 0.24V @ 300mA (Typ)
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Soft Start
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN1612-8
LD6935L/3318PX FAQ
1.How can I place an order for LD6935L/3318PX through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6935L/3318PX 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 LD6935L/3318PX reliable?
The price and inventory of LD6935L/3318PX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6935L/3318PX is usually 5 days.
3.What payment methods are accepted for LD6935L/3318PX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6935L/3318PX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6935L/3318PX?
LD6935L/3318PX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6935L/3318PX 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 LD6935L/3318PX?
For technical support, including LD6935L/3318PX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6935L/3318PX requirements.
6.How does Aetrix verify that LD6935L/3318PX is sourced from the original manufacturer or authorized distributors?
All LD6935L/3318PX 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 LD6935L/3318PX meets industry standards.
7.What is the process for return or replacement of LD6935L/3318PX?
All LD6935L/3318PX units undergo pre-shipment inspection (PSI). If there is an issue with LD6935L/3318PX, 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 LD6935L/3318PX part is unused and in its original packaging.
Return procedure for LD6935L/3318PX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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