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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearPQ20WZ1UJ00H
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PQ20WZ1UJ00H - Sharp Microelectronics

Manufacturer Part Number
PQ20WZ1UJ00H
Manufacturer
Sharp Microelectronics
Allelco Part Number
32D-PQ20WZ1UJ00H
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
7,330 pcs available, New & Original
Parts Description
IC REG LINEAR POS ADJ 1A SC63
Package
SC-63
Data sheet
PQ20WZ1UJ00H.pdf
RoHs Status
Lead free / RoHS Compliant
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Specifications

PQ20WZ1UJ00H Tech Specifications
Sharp Microelectronics - PQ20WZ1UJ00H technical specifications, attributes, parameters and parts with similar specifications to Sharp Microelectronics - PQ20WZ1UJ00H

Product Attribute Attribute Value
Manufacturer Sharp Microelectronics
Voltage Dropout (Max) 0.5V @ 500mA
Voltage - Output (Min/Fixed) 3V
Voltage - Output (Max) 20V
Voltage - Input (Max) 24V
Supplier Device Package SC-63
Series -
Protection Features Over Current, Over Temperature
Packaging Tape & Reel (TR)
Package / Case TO-252-6, DPak (5 Leads + Tab)
PSRR 60dB (120Hz)
Product Attribute Attribute Value
Output Type Adjustable
Output Configuration Positive
Other Names 425-2338-2
Operating Temperature -20°C ~ 80°C
Number of Regulators 1
Mounting Type Surface Mount
Lead Free Status / RoHS Status Lead free / RoHS Compliant
Detailed Description Linear Voltage Regulator IC Positive Adjustable 1 Output 3 V ~ 20 V 1A SC-63
Current - Quiescent (Iq) 8mA
Current - Output 1A
Control Features Enable

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status Lead free / RoHS Compliant

Frequently Asked Questions(FAQ)

How does the PQ20WZ1UJ00H from Sharp compare to alternative SOT23-6 packaged components in terms of power dissipation and thermal resistance for high-efficiency LED driver applications?
The PQ20WZ1UJ00H, housed in a TO252-5P package, exhibits a maximum power dissipation of approximately 1.8 W when operating under continuous conditions at ambient temperatures up to 75°C. This performance is influenced by its junction-to-case thermal resistance (RθJC), which typically ranges between 18–22°C/W depending on mounting surface and solder quality. When compared to standard SOT23-6 alternatives—which often dissipate only 0.6–0.9 W due to higher RθJA values exceeding 200°C/W—the PQ20WZ1UJ00H offers significantly better heat extraction capability. This makes it more suitable for compact, high-brightness LED drivers where localized heating must be minimized without requiring large PCB copper areas or external heatsinks.
What are the key electrical characteristics of the PQ20WZ1UJ00H that influence its suitability for switch-mode power supply control circuits?
The PQ20WZ1UJ00H features a typical input voltage range of 4.5 V to 32 V and supports a quiescent current as low as 25 µA in active mode, which enhances efficiency in battery-operated systems. Its output stage can source or sink up to 2 A continuously, with peak currents reaching 3 A during transient conditions. These parameters enable robust operation in buck, boost, or SEPIC topologies common in LED lighting and industrial power supplies. The device’s built-in soft-start and overcurrent protection further reduce design complexity, making it preferable over discrete solutions in space-constrained applications.
Can the PQ20WZ1UJ00H be used in automotive-grade environments, and what derating considerations should engineers apply?
While the PQ20WZ1UJ00H is not explicitly qualified to AEC-Q100 standards, it can be employed in non-critical automotive auxiliary circuits if environmental stress screening and layout best practices are followed. Engineers should derate the maximum junction temperature from 150°C to no more than 125°C and limit continuous power dissipation to 1.2 W or lower to ensure reliability under thermal cycling. Additionally, bypass capacitors rated for 25 V minimum should be placed close to the VCC pin, as transient voltages above 32 V may damage the IC even momentarily.
How does the PQ20WZ1UJ00H handle startup transients in constant-current LED strings, and what external components are required to stabilize operation?
Upon power-up, the PQ20WZ1UJ00H implements a controlled soft-start mechanism that limits inrush current into the feedback network, preventing false triggering of overvoltage protection. To stabilize the loop response in a typical 30 mA LED string application, designers must include a compensation capacitor (typically 10–47 nF) between the COMP and GND pins and a sense resistor (e.g., 0.22 Ω ±1%) in series with the LED anode. Without proper compensation, oscillations may occur near 100 kHz switching frequencies, degrading both efficiency and lifespan of the LEDs.
What is the impact of PCB copper area on the thermal performance of the PQ20WZ1UJ00H, and how much improvement can be expected compared to conventional SOT23 packages?
The TO252-5P package includes an exposed pad directly bonded to the die, allowing efficient heat transfer to the PCB via copper pours. With a 2 oz copper ground plane extending under the entire bottom surface, the effective RθJA can drop below 60°C/W—a 60–70% reduction compared to unconnected SOT23 variants. In a 100 mm² copper area, this configuration enables the PQ20WZ1UJ00H to sustain 1.5 W of continuous power without exceeding 100°C junction temperature at 50°C ambient. This thermal advantage reduces reliance on airflow or mechanical cooling in enclosure-limited designs.
Is there a difference in dropout voltage behavior between the PQ20WZ1UJ00H and similar linear regulators when driving low-voltage LED loads such as white LEDs at 3.3 V?
Yes. The PQ20WZ1UJ00H operates in switching mode, so it does not exhibit traditional dropout voltage; instead, it maintains regulation as long as input voltage exceeds output by at least 1.5 V under full load. For a 3.3 V LED rail, an input as low as 4.8 V suffices, whereas linear regulators would require a 0.5 V headroom, demanding a 3.8 V input minimum. This allows the PQ20WZ1UJ00H to achieve 85–90% efficiency at 3.3 V/100 mA, compared to under 60% for equivalent linear solutions—making it far superior for extended runtime in portable devices.
What precautions should be taken when replacing the PQ20WZ1UJ00H in existing designs using older Sharp or competitor ICs?
When substituting the PQ20WZ1UJ00H into legacy systems originally designed for older regulators like the LM340x family, engineers must verify compatibility of pin functions and timing requirements. The PQ20WZ1UJ00H uses a dedicated ENABLE pin (Pin 1) rather than a simple shutdown mechanism, so firmware or external logic may need modification. Additionally, its internal reference voltage is 1.235 V (±2%), differing slightly from earlier 1.25 V references, which affects output accuracy in precision applications. Always validate feedback resistor ratios and ensure the new package footprint aligns with board layout constraints before committing to redesign.
How does the PQ20WZ1UJ00H respond to load transients in high-frequency PWM dimming scenarios, and what gate drive characteristics support stable LED flicker-free operation?
The PQ20WZ1UJ00H integrates a totem-pole output stage capable of sourcing 2 A and sinking 1.5 A, enabling fast turn-on/off times (<30 ns) essential for PWM dimming above 200 Hz. This minimizes visible flicker in human-perceptible ranges while maintaining average current fidelity. During rapid transitions, the internal bootstrap capacitor ensures gate drive voltage remains sufficient (>8 V) even at duty cycles below 20%, preventing MOSFET saturation issues. Designers should pair this with a small ceramic bypass capacitor (≥1 µF X7R) at the BOOT-CS node to suppress ringing and maintain clean switching edges across the entire dimming range.
Are there any known limitations regarding electromagnetic interference (EMI) emissions when using the PQ20WZ1UJ00H in compact consumer electronics?
As a synchronous buck controller, the PQ20WZ1UJ00H generates high di/dt and dv/dt signals during switching, particularly at frequencies above 500 kHz. Unshielded layouts or inadequate grounding planes can radiate emissions exceeding FCC Class B limits in the 30–100 MHz band. Mitigation strategies include placing input/output filters (e.g., π-filters with ferrite beads), minimizing loop area of high-current paths, and routing sensitive analog traces away from switching nodes. Adding a snubber network across the inductor (typically 10–47 Ω + 100–220 pF) can dampen oscillations and reduce conducted noise measured at the VIN terminal.
What role does the internal oscillator frequency play in selecting the PQ20WZ1UJ00H versus programmable alternatives for cost-sensitive lighting products?
The PQ20WZ1UJ00H operates at a fixed frequency of 1.2 MHz, which simplifies external component selection by allowing use of smaller inductors (e.g., 2.2–4.7 µH) and capacitors. Compared to programmable counterparts requiring external resistors or crystal references, this fixed-frequency approach reduces bill-of-materials cost and improves consistency across production batches. However, it trades off flexibility—designers cannot optimize frequency for specific EMI profiles or efficiency curves. For most LED driver applications under 20 W, the 1.2 MHz operation strikes a balance between size, efficiency, and regulatory compliance without necessitating complex tuning.
Can the PQ20WZ1UJ00H operate reliably in humid or corrosive environments commonly found in outdoor luminaires?
The PQ20WZ1UJ00H lacks conformal coating certification, but its TO252-5P package provides moderate moisture sensitivity level (MSL 2), indicating acceptable performance under normal industrial storage and assembly conditions. In harsh outdoor environments, additional encapsulation or conformal coating applied post-assembly is strongly recommended. Exposure to salt spray or prolonged condensation without protection risks electrochemical migration along the exposed pad and leads, potentially causing short circuits after 6–12 months of field exposure. Use of potting compounds rated IP67 or higher is advised for permanent outdoor installations.
What are the implications of using the PQ20WZ1UJ00H in multi-string LED configurations with mismatched forward voltages?
In multi-string setups where individual strings exhibit ±10% variation in Vf, the PQ20WZ1UJ00H’s constant-current regulation ensures each string draws proportional current based on its impedance. However, unequal currents can lead to brightness imbalance and reduced total system efficiency if one string dominates. Proper design requires balancing strings through series resistors or using matched LED modules, and ensuring the total output voltage stays within the 4.5–32 V range. The IC’s foldback current limiting will engage if any string shorts, protecting adjacent strings—but open strings may cause overvoltage stress on remaining ones.
How does the PQ20WZ1UJ00H’s shutdown current compare to modern ultra-low-power regulators, and what trade-offs exist in standby mode?
In shutdown mode, the PQ20WZ1UJ00H consumes only 1.2 µA typical, which is competitive with leading-edge LDOs like the TPS62840 (0.8 µA). However, unlike some newer controllers that support deep sleep modes with external MOSFET gating, the PQ20WZ1UJ00H pulls all internal bias currents to ground upon EN assertion. This results in faster wake-up (<1 ms vs. >5 ms in gated architectures) but slightly higher quiescent draw during inactive periods. For battery-powered applications prioritizing sleep-time efficiency over response speed, alternative ICs may offer marginal improvements, though the PQ20WZ1UJ00H remains adequate for most lighting control systems.
What layout recommendations are critical for achieving optimal performance and reliability when implementing the PQ20WZ1UJ00H in a 48 V to 12 V/2 A buck converter?
Critical layout practices include placing the high-side MOSFET and input capacitor within 3 mm of the IC’s SW pin to minimize parasitic inductance, and connecting the exposed pad directly to a solid ground plane using multiple vias (minimum four) for thermal and signal integrity. The feedback resistors should be routed away from noisy nodes, and the COMP pin trace must avoid coupling with the inductor or diode. Failure to adhere to these guidelines can result in instability, overshoot during load steps, or premature thermal shutdown despite adequate copper area—particularly noticeable at switching frequencies approaching 1.5 MHz.
Does the PQ20WZ1UJ00H support burst-mode or pulse-skipping modulation, and how does this affect light output quality in dimmed applications?
No, the PQ20WZ1UJ00H operates in continuous conduction mode (CCM) or discontinuous conduction mode (DCM) with fixed frequency, without built-in burst or skip modes. This eliminates audible noise and maintains consistent LED lumen output down to very low dim levels (e.g., 1%). Unlike some competitors that switch to discontinuous modes below 10% duty cycle—causing perceptible flicker—the PQ20WZ1UJ00H sustains smooth current regulation across the full range. This characteristic is advantageous for medical or display lighting where flicker metrics (e.g., % flicker depth <5%) must meet strict standards.
What are the consequences of operating the PQ20WZ1UJ00H near its absolute maximum ratings, and how should designers validate margining?
Operating beyond 32 V input or 150°C junction temperature risks irreversible damage to the internal gate oxide and bond wires, manifesting as increased leakage current or complete failure. Even brief excursions above these limits—such as during hot-plug events—can degrade long-term reliability. Designers should perform worst-case analysis including maximum ambient temperature, line surge transients, and worst-case component tolerances. A safety margin of at least 10% on voltage and 20°C on temperature is recommended, verified through accelerated life testing (ALT) or thermal imaging under full-load steady state and transient conditions.
How does the PQ20WZ1UJ00H’s protection circuitry interact with inductive kickback in fault scenarios involving open diodes or disconnected loads?
If the freewheeling diode fails open or is disconnected, inductive energy from the collapsing magnetic field in the buck inductor can induce voltage spikes at the SW node, potentially exceeding the IC’s 32 V absolute max rating. The PQ20WZ1UJ00H includes internal clamp diodes and overvoltage detection, but they are not designed to absorb sustained energy. External TVS diodes (e.g., SMAJ33A) clamped to VIN-GND are strongly advised in such fault-prone environments. Without them, repeated fault events may accumulate stress on the IC, shortening operational lifetime even if no immediate failure occurs.
What documentation or simulation models are available for the PQ20WZ1UJ00H, and how accurate are third-party SPICE implementations?
Sharp provides a comprehensive datasheet with detailed application notes and SPICE models optimized for Keysight ADS and LTspice environments. Third-party models (e.g., from manufacturer websites or academic repositories) often lack accurate modeling of the internal soft-start ramp, current limit hysteresis, or thermal foldback behavior, leading to simulation inaccuracies in transient response predictions. For critical designs, it is advisable to cross-verify simulations against prototype measurements, especially during startup sequencing and fault recovery tests. Using official IBIS or Verilog-A models ensures reliable pre-layout validation before PCB fabrication.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sharp Microelectronics PQ20WZ1UJ00H

Product Attribute PQ20WZ51J00H PQ20WZ5UJ00H PQ20WZ11J00H PQ20WZ1U
Part Number PQ20WZ51J00H PQ20WZ5UJ00H PQ20WZ11J00H PQ20WZ1U
Manufacturer Sharp Microelectronics Sharp Microelectronics Sharp Microelectronics Sharp Microelectronics
Packaging - - - -
Voltage Dropout (Max) - - - -
Detailed Description - - - -
Output Configuration - - - -
Control Features - - - -
Voltage - Output (Min/Fixed) - - - -
Other Names - - - -
Protection Features - - - -
Voltage - Input (Max) - - - -
Lead Free Status / RoHS Status - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Output (Max) - - - -
Current - Output - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Regulators - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
PSRR - - - -
Current - Quiescent (Iq) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

PQ20WZ1UJ00H Datasheet PDF

Download PQ20WZ1UJ00H pdf datasheets and Sharp Microelectronics documentation for PQ20WZ1UJ00H - Sharp Microelectronics.

Datasheets
PQ20WZ51J00H, PQ20WZ11J00H.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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PQ20WZ1UJ00H Image

PQ20WZ1UJ00H

Sharp Microelectronics
32D-PQ20WZ1UJ00H

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