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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearS-L2985B18-H4T1
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S-L2985B18-H4T1 - ABLIC Inc.

Manufacturer Part Number
S-L2985B18-H4T1
Manufacturer
ABLIC
Allelco Part Number
32D-S-L2985B18-H4T1
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
3,680 pcs available, New & Original
Parts Description
IC REG LINEAR 1.8V 150MA WLP-4B
Package
WLP-4B
Data sheet
S-L2985B18-H4T1.pdf

PCN Obsolescence/ EOL

S‐L2985 Series 21/Jun/2012.pdf
RoHs Status
 
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Specifications

S-L2985B18-H4T1 Tech Specifications
ABLIC Inc. - S-L2985B18-H4T1 technical specifications, attributes, parameters and parts with similar specifications to ABLIC Inc. - S-L2985B18-H4T1

Product Attribute Attribute Value
Manufacturer ABLIC
Voltage Dropout (Max) 0.47V @ 100mA
Voltage - Output (Min/Fixed) 1.8V
Voltage - Output (Max) -
Voltage - Input (Max) 6.5V
Supplier Device Package WLP-4B
Series S-L2985
Protection Features Over Current
Package / Case 4-UFBGA, WLCSP
Package Tape & Reel (TR)
Product Attribute Attribute Value
PSRR 80dB (1kHz)
Output Type Fixed
Output Configuration Positive
Operating Temperature -40°C ~ 85°C (TA)
Number of Regulators 1
Mounting Type Surface Mount
Current - Supply (Max) 90 µA
Current - Quiescent (Iq) 1 µA
Current - Output 150mA
Control Features Enable

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

S-L2985B18-H4T1 Image
S-L2985B18-H4T1 (1)

Manufacturer Part Number

S-L2985B18-H4T1

Manufacturer

ablic

Introduction

The S-L2985B18-H4T1 is a high-performance, low dropout (LDO) linear voltage regulator from ablic. It is designed to provide a fixed 1.8V output voltage from an input voltage of up to 6.5V. The regulator features a low quiescent current of 1uA and a maximum output current of 150mA, making it suitable for a wide range of low-power applications.

Product Features and Performance

Fixed 1.8V output voltage

Input voltage range up to 6.5V

Low quiescent current of 1uA

Maximum output current of 150mA

Low dropout voltage of 0.47V @ 100mA

High power supply rejection ratio (PSRR) of 80dB at 1kHz

Enable control feature

Over-current protection

Product Advantages

Efficient power management with low quiescent current

Compact WLCSP-4B package for space-constrained designs

Robust over-current protection for reliable operation

Broad input voltage range suitable for various applications

Key Reasons to Choose This Product

Optimized for low-power, portable applications

Excellent power efficiency and thermal performance

Reliable protection features for safe operation

Space-saving package for compact design integration

Quality and Safety Features

Robust over-current protection

Wide operating temperature range of -40°C to 85°C

Compatibility

The S-L2985B18-H4T1 is designed to be compatible with a wide range of electronic devices and systems that require a stable, low-voltage power supply.

Application Areas

Portable electronics

Wearable devices

IoT and sensor applications

Battery-powered equipment

Industrial control systems

Product Lifecycle

The S-L2985B18-H4T1 is currently in the obsolete product status. There may be equivalent or alternative models available from ablic or other manufacturers. Please contact our website's sales team for more information on the current product availability and recommended alternatives.

Frequently Asked Questions(FAQ)

How does the S-L2985B18-H4T1 compare to other regulators in the S-L2985 series when considering quiescent current and dropout voltage at moderate load conditions?
The S-L2985B18-H4T1 exhibits a quiescent current of 1 µA, which is among the lowest in its class, making it highly suitable for battery-powered applications. Its maximum dropout voltage is 0.47V at 100mA, indicating efficient regulation even under moderate loads. Compared to higher-current variants in the same series, this device maintains similar ultra-low Iq while delivering a fixed 1.8V output, offering a favorable balance between efficiency and power delivery without requiring external components.
What are the implications of using the WLP-4B package on thermal performance and PCB layout for the S-L2985B18-H4T1 in space-constrained designs?
The WLP-4B (Wafer-Level Chip Scale Package) used by the S-L2985B18-H4T1 offers minimal footprint and weight, ideal for compact systems. However, its small size results in limited exposed pad area for heat dissipation, so thermal management relies heavily on proper PCB copper pour design. Without adequate ground plane or thermal vias, junction temperatures can rise significantly during sustained operation near 150mA. Engineers should ensure sufficient copper coverage beneath the device and avoid routing high-current traces underneath it.
Can the S-L2985B18-H4T1 safely operate with input voltages close to its output voltage, such as a 1.9V supply, and what are the consequences on dropout behavior?
Yes, the S-L2985B18-H4T1 can accept inputs down to 1.8V (equal to its output), but performance degrades as Vin approaches Vout. At a 1.9V input, the dropout margin is only 0.1V, well below the typical 0.47V max at 100mA. This may result in output voltage droop or instability if transient currents exceed 50–60mA. For reliable regulation under such low-margin conditions, input capacitance must be carefully selected, and load transients minimized.
How does the enable pin functionality on the S-L2985B18-H4T1 affect system-level power sequencing, and what precautions should be taken during startup?
The S-L2985B18-H4T1 features an active-high enable pin that allows precise control over regulator activation. When disabled, Iq drops to sub-µA levels, enabling true shutdown. During power-up sequencing, enabling the device after core logic stabilization prevents inrush current into downstream circuitry. Conversely, disabling it before removing power helps reduce reverse current risk from sensitive loads. Ensure enable signals are stable before asserting and deasserted after sufficient decay of any residual charge in output capacitors.
Is the overcurrent protection feature on the S-L2985B18-H4T1 fast enough to protect microcontroller GPIO pins powered through this regulator during short-circuit events?
The S-L2985B18-H4T1 includes built-in overcurrent protection, though response time depends on fault magnitude and internal comparator speed. While it will eventually limit current during a hard short, the response may not be instantaneous enough to prevent damage to delicate GPIO pins rated for <10mA continuous. For added protection, consider placing a small series resistor (e.g., 10Ω) or using a polyfuse upstream, especially if driving capacitive loads or digital peripherals directly.
What PSRR characteristics should engineers expect from the S-L2985B18-H4T1 at 1kHz, and how might noise coupling impact analog subsystems?
The S-L2985B18-H4T1 provides a PSRR of 80dB at 1kHz, meaning input ripple at this frequency is attenuated by a factor of 10,000. This makes it suitable for noise-sensitive applications like sensor interfaces or RF modules requiring clean 1.8V rails. However, PSRR degrades at higher frequencies—typically dropping to ~40dB above 10kHz—so additional filtering may still be needed if switching supplies are nearby. Proper bypassing with low-ESR capacitors at the input and output further enhances noise rejection.
In what scenarios would the dropout voltage of the S-L2985B18-H4T1 become a critical constraint, particularly in portable electronics?
The 0.47V dropout at 100mA becomes problematic in systems where input voltage varies widely, such as Li-ion batteries draining from 4.2V to 3.0V. Near full discharge (around 3.0V), the dropout margin for a 1.8V rail shrinks to just 1.2V, allowing stable operation down to ~1.8V. However, under heavy load, even minor voltage sag could push Vin too close to Vout, causing regulation failure. Battery monitoring or dynamic load shedding may be necessary in extreme cases.
How does the operating temperature range of -40°C to 85°C influence reliability considerations for the S-L2985B18-H4T1 in automotive or industrial edge applications?
Although rated only up to 85°C ambient, the S-L2985B18-H4T1 can tolerate brief excursions beyond this if derated properly. In high-power environments, self-heating from dropout loss (P = (Vin - Vout) × Iload) must be accounted for. For example, at 6.5V input and 100mA load, power dissipation reaches 0.47W, elevating junction temperature significantly above TA. Thermal resistance of the WLP package (~60°C/W estimated) means even small ambient increases reduce usable current headroom, necessitating careful airflow or spacing analysis.
Should the S-L2985B18-H4T1 require external compensation, and how does its internal architecture simplify stability concerns?
No external compensation is required for the S-L2985B18-H4T1 due to its internally compensated architecture. This simplifies design and reduces BOM count, but limits flexibility in optimizing loop dynamics for specific output capacitance or ESR combinations. Using ceramic capacitors with very low ESR (<10mΩ) can lead to peaking or instability; thus, a small series resistor (e.g., 0.5–2Ω) is often recommended when using ultra-low-ESR caps for improved phase margin.
What role does the Moisture Sensitivity Level (MSL) of 1 play in manufacturing handling of the S-L2985B18-H4T1, and why is this advantageous for high-volume production?
With an MSL rating of 1, the S-L2985B18-H4T1 has unlimited floor life under normal storage conditions, eliminating the need for dry packaging or bake-out procedures before assembly. This reduces handling complexity and cost in high-volume manufacturing, accelerates time-to-market, and minimizes risk of moisture-induced defects like popcorning during reflow. It aligns well with standard SMT lines without special precautions, streamlining supply chain logistics.
How does the choice of output capacitor type affect startup behavior and transient response when using the S-L2985B18-H4T1?
Ceramic capacitors provide excellent transient response but require caution due to their nonlinear capacitance vs. DC bias. A 2.2µF X7R MLCC at 1.8V may drop to 1.5µF effective value under bias, potentially violating minimum load requirements. Tantalum or polymer capacitors offer more stable capacitance but slower discharge during transients. For best results, select a capacitor with sufficient effective value at DC bias and include a small series resistor if ringing occurs during turn-on.
What are the trade-offs between using the S-L2985B18-H4T1 versus a switching regulator in a low-noise, low-dropout application requiring 1.8V at 100mA?
The S-L2985B18-H4T1 avoids switching noise entirely, providing a clean analog rail essential for precision ADCs or RF circuits. Unlike most switchers, it delivers 80dB PSRR at 1kHz and zero ripple. However, its 0.47V dropout at 100mA implies significant power loss (up to 70mW) compared to >85% efficient buck converters. In battery-limited systems, this reduces runtime by 10–20%. The decision hinges on whether noise immunity outweighs energy efficiency.
Does the S-L2985B18-H4T1 support parallel operation or current sharing, and what are the implications for redundancy or increased current capability?
The S-L2985B18-H4T1 does not support native parallel operation or current sharing due to lack of synchronization or master-slave control. Attempting to paralleled units risks imbalance, where one device takes excess current due to slight Vout mismatches, potentially triggering overcurrent protection prematurely. If higher current is needed, selecting a higher-current variant in the S-L2985 family (e.g., 300mA version) is preferred over parallelization.
How does the RoHS3 compliance status of the S-L2985B18-H4T1 impact regulatory submissions and global market access?
RoHS3 compliance confirms adherence to EU Directive 2015/869, covering additional restricted substances including phthalates like DEHP and DIBP. This broadens export eligibility across Europe, Japan, and other jurisdictions enforcing strict chemical controls. Documentation supporting RoHS3 compliance simplifies CE marking, reduces audit overhead, and mitigates risk of non-compliance penalties during customs inspections or customer audits.
What considerations apply when replacing the S-L2985B18-H4T1 with another linear regulator in an existing design?
Substitution requires matching key parameters: output voltage (±2% tolerance), max input voltage (≥6.5V), dropout profile, and quiescent current (<1µA). Footprint compatibility is critical—WLP-4B lacks solder pads, demanding identical pad layout and stencil design. Additionally, verify that the replacement’s enable logic matches system sequencing, and confirm PSRR meets noise requirements. Failure to match these can degrade efficiency, increase EMI, or cause boot failures.
How does the base product number S-L2985 inform selection among different output versions, and what benefits does modularity offer?
The S-L2985 base number indicates a family of fixed-output LDOs with consistent architecture, enabling designers to reuse layouts and firmware across multiple voltage options. Variants like S-L2985B33-H4T1 (3.3V) share pinout, package, and control features, simplifying inventory and reducing development effort. This modularity supports rapid prototyping and future-proofing, as new outputs can be integrated without redesigning power stages.
What input capacitance values and types are recommended for stable operation of the S-L2985B18-H4T1, especially under varying load conditions?
The datasheet recommends 1µF or greater ceramic input capacitance with low ESR (<100mΩ). A 2.2µF X5R/X7R MLCC suffices for most applications, placed within 1mm of the VIN pin. Avoid aluminum electrolytics unless absolutely necessary due to high ESR. If using multiple capacitors, ensure total effective capacitance remains above 1µF, accounting for DC bias effects in MLCCs. Ferrite beads should be omitted unless filtering high-frequency noise, as they add inductance and can destabilize the loop.
How does the absence of a heatsink requirement for the S-L2985B18-H4T1 affect long-term reliability in continuous operation at elevated currents?
The WLP-4B package relies solely on conduction through PCB copper for heat spreading. At 100mA with 4.5V input, power dissipation reaches ~400mW, generating ~24°C rise per watt estimate. Over time, repeated thermal cycling near upper current limits may stress bond wires, though the MSL-1 rating suggests robust construction. Continuous use near 150mA should be avoided without verifying thermal impedance and ensuring no obstructions impede natural convection, especially in sealed enclosures.

Parts with Similar Specifications

The three parts on the right have similar specifications to ABLIC Inc. S-L2985B18-H4T1

Product Attribute S-L2985B31-H4T1 S-L2985B15-H4T1 S-L2985B28-H4T1 S-L2985B33-H4T1
Part Number S-L2985B31-H4T1 S-L2985B15-H4T1 S-L2985B28-H4T1 S-L2985B33-H4T1
Manufacturer ABLIC Inc. ABLIC Inc. ABLIC Inc. ABLIC Inc.
Current - Output - - - -
Voltage - Output (Min/Fixed) - - - -
Voltage - Output (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Voltage Dropout (Max) - - - -
Control Features - - - -
Series - - - -
Protection Features - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Configuration - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Number of Regulators - - - -
PSRR - - - -
Voltage - Input (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current - Quiescent (Iq) - - - -
Current - Supply (Max) - - - -

S-L2985B18-H4T1 Datasheet PDF

Download S-L2985B18-H4T1 pdf datasheets and ABLIC Inc. documentation for S-L2985B18-H4T1 - ABLIC Inc..

PCN Design/Specification
All Dev Materials Chg 23/Mar/2020.pdf Solder Plating Material Chg 10/Dec/2018.pdf
PCN Obsolescence/ EOL
S‐L2985 Series 21/Jun/2012.pdf

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S-L2985B18-H4T1 Image

S-L2985B18-H4T1

ABLIC Inc.
32D-S-L2985B18-H4T1

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