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NXP Semiconductors LD6938CX6/1833PLJ
- Part No.:
- LD6938CX6/1833PLJ
- Manufacturer:
- NXP Semiconductors
- Package:
- 6-XFBGA, WLCSP
- Datasheet:
-
LD6938CX6/1833PLJ.pdf
- Description:
- IC REG LINEAR 1.8V/3.3V 6WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,549
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Product details
Overview
LD6938CX6/1833PLJ from NXP Semiconductors is a dual low-dropout (LDO) regulator IC delivering two independent 300 mA outputs with fixed nominal voltages of 1.8 V and 3.3 V, 240 mV dropout at full load, 80 dB PSRR at 1 kHz, and 70 µV RMS output noise (10 Hz–100 kHz). It serves as a compact, low-noise power supply for core and I/O rails in space-constrained portable electronics.
For engineers reviewing the LD6938CX6/1833PLJ datasheet, LD6938CX6/1833PLJ pinout, LD6938CX6/1833PLJ application, or LD6938CX6/1833PLJ equivalent, key selection criteria include dual-rail voltage pairing, WLCSP6 package height (0.47 mm), auto-discharge functionality, quiescent current (30 µA per LDO), and thermal shutdown at 160 °C.
Technical Context
The LD6938CX6/1833PLJ integrates two independent LDO regulators sharing a common input but featuring separate enable inputs (EN1, EN2) and outputs (OUT1, OUT2), each with dedicated soft-start and foldback current limiting. Its -PL suffix denotes auto-discharge mode on disable, implemented via a 100 Ω pull-down resistor per output.
It operates across an input voltage range of 1.7 V to 5.5 V, supports output capacitors ≥0.7 µF (X7R recommended), and maintains stability under ambient temperatures from −40 °C to +85 °C with junction temperature up to +125 °C. Thermal protection triggers shutdown at 160 °C with 20 K hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 300 mA per channel - sufficient to power baseband processors or memory subsystems in mobile devices |
| Dropout Voltage | 240 mV typical at 300 mA - enables regulation from low-input sources like single-cell Li-ion batteries |
| PSRR | 80 dB at 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input |
| Output Noise | 70 µV RMS (10 Hz–100 kHz) - critical for noise-sensitive analog circuits such as ADCs or RF front-ends |
| Quiescent Current | 30 µA per LDO at zero load - minimizes battery drain during system standby |
| Enable Threshold | VIL ≤ 0.4 V, VIH ≥ 1.1 V - compatible with standard 1.8 V GPIO logic without level shifting |
| Shutdown Current | ≤1.0 µA total - ensures ultra-low leakage when both regulators are disabled |
Pinout & Package
LD6938CX6/1833PLJ uses a 6-bump Wafer-Level Chip-Scale Package (WLCSP6) measuring 1.2 mm × 0.8 mm × 0.47 mm with 0.4 mm pitch. The package features a 2×3 bump array and requires Pb-free reflow with peak temperature ≤260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 | Regulator 1 enable input | Active-high control for OUT1; enables independent sequencing of 1.8 V rail |
| OUT1 | Regulator 1 output voltage | Fixed 1.8 V output delivering up to 300 mA with auto-discharge on disable |
| GND | Supply ground | Common reference for both regulators and thermal path to PCB ground plane |
| IN | Supply voltage input | Shared input for both LDOs; accepts 1.7 V–5.5 V with ≥0.7 µF input capacitance |
| EN2 | Regulator 2 enable input | Active-high control for OUT2; allows staggered startup or independent power gating of 3.3 V rail |
| OUT2 | Regulator 2 output voltage | Fixed 3.3 V output delivering up to 300 mA with auto-discharge on disable |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LDOs | Enables simultaneous generation of 1.8 V and 3.3 V rails from one compact package, reducing BOM count and board area |
| Auto-discharge mode (-PL) | 100 Ω internal pull-down per output ensures rapid discharge of output capacitors upon disable, preventing back-powering of downstream circuitry |
| Soft-start circuit | Limits inrush current during startup to protect input source and prevent system brownout during power-up sequencing |
| Foldback current limiting | Reduces output current to 750 mA during overload and further to 100 mA under short-circuit, minimizing thermal stress and enabling safe fault recovery |
| Thermal shutdown | Shuts down at 160 °C with 20 K hysteresis to prevent permanent damage during sustained overloads or poor PCB thermal design |
Applications
| Smartphone Power Management | Tablet PC Core Logic Supply |
|---|---|
Use Scenario: Dual-rail power delivery for application processor cores (1.8 V) and peripheral interfaces (3.3 V) in slim-profile smartphones. IC Role / Device Role / Timing Role: Primary LDO regulator providing clean, sequenced, low-noise DC power to SoC domains and USB/SDIO interfaces. Use Value: 70 µV RMS noise and 80 dB PSRR ensure stable operation of high-speed digital logic and mixed-signal peripherals without external filtering. | Use Scenario: Independent voltage regulation for GPU voltage domain (1.8 V) and display interface circuitry (3.3 V) in 7–10 inch tablets. IC Role / Device Role / Timing Role: Compact dual-LDO replacing discrete solutions to meet strict height constraints (<0.5 mm) while supporting dynamic voltage scaling. Use Value: 0.47 mm package height and 1.2 mm × 0.8 mm footprint enable placement under narrow bezels or beneath stacked memory packages. |
| Digital Still Camera Sensor Bias | Portable Media Player Audio Codec |
Use Scenario: Powering CMOS image sensor analog bias (3.3 V) and digital core (1.8 V) in compact DSC modules with tight thermal budgets. IC Role / Device Role / Timing Role: Low-noise dual LDO supplying isolated analog and digital rails to minimize crosstalk-induced image artifacts. Use Value: 240 mV dropout allows direct regulation from 3.6 V battery, preserving headroom for battery voltage sag during flash LED operation. | Use Scenario: Providing regulated 1.8 V for DSP core and 3.3 V for audio DAC/ADC in battery-powered MP3/WMA players. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current dual regulator maintaining audio fidelity during playback and minimizing standby drain. Use Value: 30 µA per LDO quiescent current extends battery life in always-on audio monitoring modes without compromising start-up speed (≤200 µs). |
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 XC6219B183MR-G | Single-output LDO (1.8 V only); no second output or auto-discharge; 150 mA rating | Requires separate regulator for 3.3 V rail; unsuitable for integrated dual-rail designs | Select only if 3.3 V rail is supplied externally or by another IC |
| Richtek RT9013-18PF | Single 1.8 V LDO with 300 mA rating; no 3.3 V output; no auto-discharge; 5-pin SOT-23 package | Larger footprint and height; lacks dual-output integration and fast discharge capability | Consider only when WLCSP6 size constraint is relaxed and dual-rail integration is not required |
Compared with XC6219B183MR-G and RT9013-18PF, the LD6938CX6/1833PLJ uniquely delivers matched 1.8 V/3.3 V outputs in a 0.47 mm-height WLCSP6 with auto-discharge-enabling single-package dual-rail power in ultra-thin portable devices where board space and thermal profile are critical.
Availability
LD6938CX6/1833PLJ is available at Aetrix Electronics and suitable for smartphone power management, tablet PC core logic supply, digital still camera sensor bias, and portable media player audio codec applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LD6938CX6/1833PLJ 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 electronics.
The LD6938 series belongs to NXP's low-noise, dual-output LDO product line designed specifically for space-constrained portable devices requiring tightly regulated, low-ripple dual-rail power with minimal board footprint and thermal impact.
FAQ
What are the fixed output voltages of the LD6938CX6/1833PLJ?
The LD6938CX6/1833PLJ provides two fixed output voltages: 1.8 V on OUT1 and 3.3 V on OUT2. These values are factory-trimmed and non-adjustable. The "/1833PL" suffix explicitly denotes this voltage combination and confirms auto-discharge functionality on both outputs, as verified in NXP's ordering information tables.
Does the LD6938CX6/1833PLJ support independent enable control for each output?
Yes, the LD6938CX6/1833PLJ has separate enable inputs: EN1 controls OUT1 (1.8 V) and EN2 controls OUT2 (3.3 V). Each enable pin accepts standard logic levels (VIH ≥ 1.1 V, VIL ≤ 0.4 V) and supports independent power sequencing, allowing staggered startup or selective shutdown of either rail without affecting the other.
What is the maximum input voltage the LD6938CX6/1833PLJ can accept?
The LD6938CX6/1833PLJ supports an input voltage range of 1.7 V to 5.5 V, with transient tolerance up to +6.0 V for durations ≤4 ms. This range accommodates single-cell Li-ion (2.7–4.2 V), Li-polymer, or regulated 3.3 V/5 V supplies, making it suitable for direct battery connection in portable systems.
How does the auto-discharge feature work on the LD6938CX6/1833PLJ?
When either EN1 or EN2 is driven low, the corresponding output (OUT1 or OUT2) enters auto-discharge mode via an internal 100 Ω pull-down resistor, rapidly discharging its output capacitor. This prevents back-powering of downstream circuitry and ensures clean power-down behavior-critical for systems with multiple power domains or hot-swap requirements.
What package type and dimensions does the LD6938CX6/1833PLJ use?
The LD6938CX6/1833PLJ uses a 6-bump Wafer-Level Chip-Scale Package (WLCSP6) measuring 1.2 mm × 0.8 mm × 0.47 mm with 0.4 mm pitch. Its ultra-low profile and minimal footprint are optimized for thin mobile devices, and it requires Pb-free reflow with peak temperature ≤260 °C per NXP's assembly guidelines.
LD6938CX6/1833PLJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 6-XFBGA, WLCSP
- 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):
- 0.4V @ 300mA, 0.4V @ 300mA
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 75 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:
- 6-WLCSP (1.2x0.80)
LD6938CX6/1833PLJ FAQ
1.How can I place an order for LD6938CX6/1833PLJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LD6938CX6/1833PLJ 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 LD6938CX6/1833PLJ reliable?
The price and inventory of LD6938CX6/1833PLJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD6938CX6/1833PLJ is usually 5 days.
3.What payment methods are accepted for LD6938CX6/1833PLJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD6938CX6/1833PLJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD6938CX6/1833PLJ?
LD6938CX6/1833PLJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD6938CX6/1833PLJ 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 LD6938CX6/1833PLJ?
For technical support, including LD6938CX6/1833PLJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD6938CX6/1833PLJ requirements.
6.How does Aetrix verify that LD6938CX6/1833PLJ is sourced from the original manufacturer or authorized distributors?
All LD6938CX6/1833PLJ 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 LD6938CX6/1833PLJ meets industry standards.
7.What is the process for return or replacement of LD6938CX6/1833PLJ?
All LD6938CX6/1833PLJ units undergo pre-shipment inspection (PSI). If there is an issue with LD6938CX6/1833PLJ, 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 LD6938CX6/1833PLJ part is unused and in its original packaging.
Return procedure for LD6938CX6/1833PLJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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