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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear Regulator Controllers

Diodes Incorporated AP451SLA

Name: AP451SLA
Brand: Diodes Incorporated
SKU: AP451SLA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP451SLA

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear Regulator Controllers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: AP451SLA.pdf

Description:: IC LNR REG CTRLR 2OUT 8SOP

Quantity:: RFQ Add To RFQ list

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Inventory:3,563

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Product details

Overview

AP451SLA from Anachip Corp. is a dual-channel linear voltage controller IC designed for independent regulation of two power rails in display and motherboard power systems. It integrates two error amplifiers, 0.8 V reference, UVLO (2.0 V lower threshold), current-limit protection, and NPN/N-channel MOSFET drive capability. Operates from 3.0–18 V supply, supports adjustable output via external resistors, and targets LCD monitor/TV and VGA board applications.

For engineers reviewing the AP451SLA datasheet, AP451SLA pinout, AP451SLA application, or AP451SLA equivalent, key selection criteria include dual independent enable control, ±1% reference accuracy over temperature, low-ESR MLCC compatibility, thermal resistance (θ_JA = 120°C/W for SOP-8), and BJT/MOSFET driver flexibility in legacy analog power designs.

Technical Context

The AP451SLA implements two fully independent linear regulator control loops sharing only the V_CC supply and GND. Each channel features a dedicated feedback input (FB1/FB2), enable pin (EN1/EN2), and output driver (OUT1/OUT2), with internal 0.8 V bandgap reference routed to both error amplifiers.

UVLO activates below 2.0 V (hysteresis 100 mV) to disable both outputs until stable V_CC is established. Current limiting is implemented externally via BJT collector sensing - no internal current-sense amplifier or FET R_DS(on) monitoring - requiring discrete external transistor placement per channel.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	0.800 V ±1% over –20°C to +85°C - sets base accuracy for both regulated outputs
Supply Voltage Range	3.0 V to 18 V - supports wide-input industrial and display supply rails
UVLO Threshold	2.0 V (lower), 2.1 V (upper), 100 mV hysteresis - ensures clean startup without brownout oscillation
Enable Input Logic	V_IL ≤ 0.6 V (OFF), V_IH ≥ 2.0 V (ON) - compatible with 3.3 V and 5 V logic families
Supply Current	4–6 mA typical at 6 V - enables low-quiescent design in always-on auxiliary rails
Shutdown Current	180–500 µA - minimizes standby loss when both EN pins are low
Thermal Resistance θ_JA	120°C/W (SOP-8) - defines max power dissipation limit under natural convection

Pinout & Package

SOP-8L package: 4.9 mm × 3.9 mm body, 1.27 mm pitch, gull-wing leads, Pb-free compliant. Thermal pad not present; junction-to-ambient path relies on leadframe conduction.

Pin/Terminal	Circuit Role	Design Meaning
OUT1	Channel 1 driver output	Open-collector NPN or N-channel gate drive node - requires external pass transistor
FB1	Channel 1 feedback input	Inverting input of error amplifier - connects to resistor divider from V_OUT1 to set output voltage
EN1	Channel 1 enable input	Active-high digital control - pulls OUT1 high-impedance when low
GND	Signal ground reference	Common return for all internal analog blocks and feedback paths
EN2	Channel 2 enable input	Independent active-high control - allows staggered power sequencing
FB2	Channel 2 feedback input	Second error amplifier inverting input - enables separate V_OUT2 programming
OUT2	Channel 2 driver output	Second open-collector driver - electrically isolated from OUT1
V_CC	Positive supply input	Power source for internal bias, reference, and logic - must be ≥3.0 V for operation

Key Features

Feature	Design Value
Dual independent enable control	EN1/EN2 allow per-rail power-up sequencing and fault isolation in multi-rail systems
0.8 V precision reference	±1% tolerance over full temperature range enables accurate 1.8 V and 2.5 V outputs using standard 1% resistors
MLCC-compatible output stage	Stable with low-ESR ceramic capacitors down to 0.1 µF - reduces board area vs. aluminum electrolytics
External current limit	Supports scalable overcurrent protection using cost-optimized discrete BJTs (e.g., AT882D) or MOSFETs (e.g., AF9410N)
UVLO with hysteresis	Prevents erratic output behavior during brownout conditions by holding both channels off until V_CC exceeds 2.1 V

Applications

LCD Monitor Power Supply

VGA Board Dual-Rail Regulation

Use Scenario: Regulating 1.8 V and 2.5 V supplies for timing controller (TCON) and source driver ICs in 15–24 inch LCD panels.

IC Role / Device Role / Timing Role: Dual linear controller providing independent, sequenced, low-noise analog power rails with fast transient response.

Use Value: Enables use of compact MLCC arrays instead of bulky electrolytics, reducing height and improving reliability in slim panel designs.

Use Scenario: Generating stable analog and digital core voltages for VGA interface ASICs and DACs on PC motherboard add-in cards.

IC Role / Device Role / Timing Role: Independent linear regulator controller managing separate 1.8 V pixel clock domain and 2.5 V I/O domain.

Use Value: Eliminates need for two discrete linear controllers - saves PCB space and simplifies BOM while maintaining rail independence.

XDSL Line Card Biasing

Embedded Display Subsystem

Use Scenario: Providing clean, low-noise bias for ADSL/VDSL line drivers and analog front-end (AFE) components in telecom CPE equipment.

IC Role / Device Role / Timing Role: Low-ripple linear controller delivering tightly regulated 1.8 V and 2.5 V rails immune to switching noise from nearby DC/DC converters.

Use Value: Achieves <8 mV peak-to-peak ripple at 1 A load - meets stringent SNR requirements for high-speed line signaling.

Use Scenario: Powering display subsystems in industrial HMIs, medical monitors, and kiosk terminals where EMI-sensitive analog circuits coexist with digital logic.

IC Role / Device Role / Timing Role: Dual-channel analog power manager enabling independent enable/disable of display backlight and TCON rails during sleep mode.

Use Value: Reduces system standby current to <500 µA via coordinated EN pin control - extends battery life in portable variants.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel linear controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP452SLA	Same pinout, identical architecture, but adds internal current-sense amplifier and fixed 1.25 V reference	Requires redesign of feedback network; supports direct current monitoring without external sense resistor	Select if real-time load current telemetry is required; otherwise AP451SLA offers simpler resistor-based programming
LM2676-ADJ (dual variant)	Switching regulator IC with integrated FETs; 85% efficiency vs. linear's <35%; no UVLO hysteresis or independent EN pins	Generates higher ripple; unsuitable for noise-sensitive analog rails; eliminates external pass transistors	Choose for higher efficiency in non-analog-critical rails; avoid where low noise or precise sequencing is mandatory

Compared with AP452SLA, AP451SLA provides greater design flexibility for resistor-set outputs and avoids current-sense calibration overhead; versus LM2676-ADJ, it delivers lower noise and deterministic sequencing at the cost of thermal management complexity and lower efficiency.

Availability

AP451SLA is available at Aetrix Electronics and suitable for LCD monitor/TV power supplies, VGA board regulation, and XDSL line card biasing requiring stable component supply and long-term obsolescence support.

Supply support for AP451SLA 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

Anachip Corp. is a Taiwan-based analog and mixed-signal IC designer founded in 1997, specializing in power management, LED drivers, and interface solutions for consumer and industrial markets.

The AP451 belongs to Anachip's legacy linear controller product line, developed specifically for cost-sensitive, multi-rail analog power systems in display and computing peripherals where discrete transistor-based regulation remains preferred over switching alternatives.

FAQ

What external pass devices are recommended for AP451SLA?

The AP451SLA drives NPN BJTs (e.g., AT882D) or N-channel MOSFETs (e.g., AF9410N) as external pass elements. For BJT operation, connect emitter to output and collector to OUTx; for MOSFETs, tie source to output and gate to OUTx. Base/gate resistor values must ensure saturation or full enhancement across temperature and load extremes.

Can AP451SLA regulate outputs below 0.8 V?

No. The internal 0.8 V reference is hardwired to both error amplifiers' non-inverting inputs, making sub-0.8 V regulation impossible. Minimum output is set by V_REF × (1 + R_upper/R_lower); with R_lower = 0, output equals V_REF. Practical minimum is ~0.85 V due to FB pin bias current effects.

Does AP451SLA support parallel operation of both channels for higher current?

No. Channels are electrically isolated except for shared V_CC and GND. No current-sharing circuitry or synchronization capability exists. Parallel use would cause instability due to mismatched loop gains and uncontrolled load division between independent regulators.

Is AP451SLA RoHS-compliant and halogen-free?

Yes. The SOP-8L package (SLA suffix) is Pb-free and complies with RoHS Directive 2011/65/EU. Material declarations confirm bromine and chlorine content below 900 ppm each, meeting JEDEC JS-709C halogen-free requirements for printed wiring boards.

AP451SLA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Positive Adjustable

Number of Outputs:: 2

Current - Supply:: 4mA

Voltage - Input:: 3V ~ 18V

Operating Temperature:: -20°C ~ 85°C

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOP

AP451SLA FAQ

1.How can I place an order for AP451SLA through Aetrix?

Please submit a Request for Quotation (RFQ) for AP451SLA 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 AP451SLA reliable?

The price and inventory of AP451SLA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP451SLA is usually 5 days.

3.What payment methods are accepted for AP451SLA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP451SLA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP451SLA?

AP451SLA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP451SLA 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 AP451SLA?

For technical support, including AP451SLA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP451SLA requirements.

6.How does Aetrix verify that AP451SLA is sourced from the original manufacturer or authorized distributors?

All AP451SLA 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 AP451SLA meets industry standards.

7.What is the process for return or replacement of AP451SLA?

All AP451SLA units undergo pre-shipment inspection (PSI). If there is an issue with AP451SLA, 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 AP451SLA part is unused and in its original packaging.

Return procedure for AP451SLA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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