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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated AL8853S-13

Name: AL8853S-13
Brand: Diodes Incorporated
SKU: AL8853S-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AL8853S-13

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

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

Datasheet:: AL8853S-13.pdf

Description:: IC LED DRIVER CTRLR PWM 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:11,691

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Product details

Overview

AL8853S-13 from Diodes Incorporated is a high-performance, fixed-frequency current-mode PWM boost LED controller for LCD backlighting. It regulates LED current via external sense resistor with 200mV ±3% reference, supports 6–40V input, delivers up to 95% duty cycle, and integrates OVP (2.0V threshold), OCP (300mV typical), and OTP (+160°C trip). Used in LCD TV backlight drivers requiring stable current regulation under wide input and temperature ranges.

For engineers reviewing the AL8853S-13 datasheet, AL8853S-13 pinout, AL8853S-13 application, or AL8853S-13 equivalent, this page provides verified technical context, SO-8 pin mapping, dimming control behavior, protection thresholds, and real-world design implications for boost LED driver implementation.

Technical Context

The AL8853S-13 implements peak current-mode control with internal transconductance error amplifier (Gm = 100 µA/V) and slope compensation to prevent sub-harmonic oscillation above 50% duty cycle. Its 120 kHz oscillator frequency (±10 kHz) enables stable operation across -40°C to +125°C ambient.

It features dual-stage analog dimming: external PWM input (5–50 kHz) modulates the EA reference voltage, while internal soft-start (22 mV/ms) limits inrush during startup. Protection logic includes latched shutdown for CS >1.2V (17 cycles), COMP >3.2V (37 ms), and OVP <100mV at startup - all validated in functional block diagram and test conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	6.0 V to 40 V - supports 12 V/24 V industrial and consumer DC bus inputs without pre-regulation
Feedback Reference Voltage	200 mV ±3% - sets LED current accuracy independent of forward voltage drift; enables ±1% current tolerance with 0.5% R_sense
Oscillator Frequency	120 kHz (typ.) - determines minimum inductor size and EMI profile; fixed frequency simplifies filter design
Max Duty Cycle	95% - enables high step-up ratios (e.g., 12 V → 48 V) with margin for line and load transients
OVP Threshold	2.0 V (typ.) at OVP pin - corresponds to ~60 V output with standard 100:1 divider; prevents LED string overvoltage during open-circuit fault
OCP Threshold	300 mV (typ.) at CS pin - triggers shutdown before MOSFET thermal runaway; sets peak inductor current limit at full load
UVLO Threshold	5.3 V (rising), 4.9 V (falling) - ensures clean power-on reset and brown-out immunity in automotive-grade 12 V systems
Thermal Shutdown	+160 °C (trip), +130 °C (hysteresis) - protects SO-8 package under sustained overload; junction-to-ambient θ_JA = 105 °C/W

Pinout & Package

AL8853S-13 is housed in a Pb-free SO-8 (Type TH2) package with exposed thermal pad (pin 3 GND connected internally to pad). The 8-pin layout supports compact PCB routing for boost converter feedback and gate drive paths.

Pin/Terminal	Circuit Role	Design Meaning
1 VIN	Power supply input	Accepts 6–40 V DC; supplies internal 5 V regulator and gate driver; requires local 10 µF ceramic bypass
2 GATE	High-side N-channel MOSFET driver output	Drives external power switch with 13 V max output swing at VIN=24 V; 40 ns rise / 20 ns fall into 1 nF load
3 GND	Power and signal ground reference	Common return for VIN, CS, FB, COMP, OVP, PWM; must be low-impedance plane tied to thermal pad
4 CS	Current sense input	Monitors voltage across external R_sense; 300 mV OCP threshold defines peak inductor current limit
5 FB	LED current feedback input	Compares sensed LED current to 200 mV reference; EA output drives COMP to regulate average current
6 COMP	Error amplifier compensation node	Connects RC network for loop stability; latches low if voltage exceeds 3.2 V for 37 ms (cathode-short protection)
7 OVP	Output overvoltage sense input	Monitors boosted output via resistor divider; shuts down GATE if voltage exceeds 2.0 V; startup check at <100 mV
8 PWM	Analog dimming control input	Accepts 5–50 kHz PWM signal; logic high >2.5 V enables dimming; low <1.2 V forces standby mode (<180 µA I_SHDN)

Key Features

Feature	Design Value
PWM-to-analog dimming interface	Converts external 5–50 kHz PWM into continuous EA reference modulation - eliminates audible noise and enables smooth 0–100% brightness control
Integrated slope compensation	Prevents sub-harmonic oscillation above 50% duty cycle without external components - ensures stable current regulation in high-step-up configurations
Latched cathode-short protection	Shuts down GATE if COMP >3.2 V for 37 ms - detects LED cathode short to GND before MOSFET or diode thermal failure occurs
Startup OVP validation	Blocks GATE activation if OVP pin <100 mV at power-on - verifies Schottky diode connection and prevents false start with missing output rectifier
Diode/inductor short detection	Triggers latched shutdown after 17 consecutive cycles with CS >1.2 V - protects MOSFET from destructive current surge during component failure
Thermal hysteresis management	Auto-restarts at +130 °C after +160 °C shutdown - avoids thermal cycling lockup while maintaining safe junction temperature

Applications

LCD TV Backlight

LCD Monitor Driver

Use Scenario: Driving 12–24 parallel LED strings in 32–65 inch LCD TVs with dynamic local dimming zones.

IC Role / Device Role / Timing Role: Boost controller regulating constant current per string; synchronizes PWM dimming with video frame rate.

Use Value: Enables >90% efficiency at 48 V output with 24 V input; 200 mV reference ensures ±1.5% current matching across strings.

Use Scenario: Powering 6–12 LED strings in 24–32 inch commercial monitors with industrial temperature range (-40°C to +85°C).

IC Role / Device Role / Timing Role: Primary LED current regulator in isolated boost topology; handles 12 V DC input from ATX or PoE-powered supplies.

Use Value: UVLO hysteresis (400 mV) prevents flicker during 12 V rail sag; OVP latch ensures no overvoltage stress on LEDs during cold start.

Flat Panel Display Lighting

Constant-Voltage LED Driver

Use Scenario: Backlighting for medical imaging displays requiring flicker-free, Class I safety-compliant illumination.

IC Role / Device Role / Timing Role: Current-controlled boost stage feeding downstream constant-voltage LED driver ICs.

Use Value: COMP pin monitoring enables system-level fault reporting; OTP hysteresis avoids nuisance shutdowns during transient thermal loads.

Use Scenario: Configured as constant-output-voltage source (via OVP feedback) for non-LED loads like CCFL inverters or sensor bias rails.

IC Role / Device Role / Timing Role: Regulated voltage generator using OVP pin as feedback node; FB pin grounded or unused.

Use Value: 2.0 V OVP threshold allows precise 48 V output with 24:1 resistor divider; 120 kHz switching enables small output capacitor selection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED boost controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8860Q-13	Automotive-grade AEC-Q100 qualified; wider temp range (-40°C to +125°C); identical pinout and 200 mV reference	Required for automotive infotainment displays; adds watchdog timer and enhanced ESD (4 kV HBM)	Select when ISO/TS 16949 compliance or extended temperature operation is mandatory
MPQ4425AGU-AEC1-P	Higher integration: integrated 1.5 A MOSFET; lower input range (4.5–36 V); 250 mV reference (±2%)	Suitable for space-constrained designs where external MOSFET is undesirable; lacks OVP startup check	Choose for simplified BOM in portable displays; verify OVP fault handling matches system safety requirements

Compared with AL8853S-13, AL8860Q-13 adds automotive qualification without changing core regulation behavior, while MPQ4425AGU-AEC1-P trades external MOSFET flexibility for integration - impacting thermal design and maximum output power capability.

Availability

AL8853S-13 is available at Aetrix Electronics and suitable for LCD TV backlighting, industrial monitor drivers, flat-panel display lighting, and constant-output-voltage LED driver applications requiring stable component supply and long-term manufacturability.

Supply support for AL8853S-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in high-efficiency power management, signal integrity, and LED lighting solutions for consumer, industrial, and automotive markets.

The AL8853 belongs to Diodes' LED backlight controller product line, designed specifically for cost-sensitive, high-reliability LCD display applications requiring precision current regulation and comprehensive fault protection.

FAQ

What is the recommended external slope compensation method for AL8853S-13?

Add a resistor (R_SL) between CS and ground to inject additional slope current. With IS = 50 µA typical, R_SL = V_SL/IS sets compensation amplitude; 100 mV typical V_SL yields R_SL ≈ 2 kΩ. Use only when duty cycle exceeds 50% and instability is observed in current waveform.

How does AL8853S-13 handle LED open-circuit faults?

When LEDs open, output voltage rises until OVP pin reaches 2.0 V threshold, triggering immediate GATE shutdown and COMP capacitor discharge. Recovery requires OVP pin voltage to fall below 1.9 V hysteresis (100 mV), followed by automatic soft-start reinitiation.

Can AL8853S-13 operate without an external PWM signal?

Yes - tie PWM pin to VIN through ≥10 kΩ resistor to enable full-brightness analog mode. The IC defaults to 100% dimming level; FB reference remains at 200 mV. For complete disable, pull PWM below 1.2 V for >20 ms to enter standby (<180 µA).

What is the minimum recommended R_sense value for AL8853S-13?

Based on 300 mV OCP threshold and peak current limit, R_sense ≥ 100 mΩ ensures sufficient noise margin against CS pin offset (±5 mV). For 1 A LED current, use 0.2 Ω ±1% metal film resistor to maintain 200 mV FB accuracy and avoid OCP false trips.

AL8853S-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: DC DC Controller

Topology:: Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 6V

Voltage - Supply (Max):: 40V

Voltage - Output:: -

Current - Output / Channel:: -

Frequency:: 110kHz ~ 130kHz

Dimming:: PWM

Applications:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SO (Type TH2)

AL8853S-13 FAQ

1.How can I place an order for AL8853S-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for AL8853S-13 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 AL8853S-13 reliable?

The price and inventory of AL8853S-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8853S-13 is usually 5 days.

3.What payment methods are accepted for AL8853S-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8853S-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AL8853S-13?

AL8853S-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AL8853S-13 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 AL8853S-13?

For technical support, including AL8853S-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8853S-13 requirements.

6.How does Aetrix verify that AL8853S-13 is sourced from the original manufacturer or authorized distributors?

All AL8853S-13 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 AL8853S-13 meets industry standards.

7.What is the process for return or replacement of AL8853S-13?

All AL8853S-13 units undergo pre-shipment inspection (PSI). If there is an issue with AL8853S-13, 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 AL8853S-13 part is unused and in its original packaging.

Return procedure for AL8853S-13:

1.Submit a request within 90 days.

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

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