Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics STLD20D-C8

Name: STLD20D-C8
Brand: STMicroelectronics
SKU: STLD20D-C8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: STLD20D-C8

Manufacturer:: STMicroelectronics

Category:: LED Drivers

Package:: SOT-23-8

Datasheet:: STLD20D-C8.pdf

Description:: IC LED DRV RGLTR PWM SOT23-8

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,209

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

STLD20D-C8 from STMicroelectronics is a constant-frequency boost LED driver IC designed to supply up to 4 white LEDs in series from 2.8–4.2 V input, delivering regulated 20 mA LED current with 80–85% efficiency, programmable peak inductor current (640 mA default), and integrated load disconnect switch. It targets compact portable backlight systems requiring flicker-free operation and digital dimming.

For engineers reviewing the STLD20D-C8 datasheet, STLD20D-C8 pinout, STLD20D-C8 application, or STLD20D-C8 equivalent, key selection criteria include its SOT23-8L package, PWM dimming support up to 10 kHz, OVP (18.5 V typ) and OTP (110 °C) protection, RSET-programmable current limit, and supply voltage rejection for stable LCD backlighting under battery sag.

Technical Context

The STLD20D-C8 implements a fixed-frequency (400–600 kHz) PWM-controlled boost converter with internal compensation to reject input voltage transients. Its feedback loop regulates LED current via sensing resistor RLED (15 Ω typical), referencing a precise 0.302 V FB threshold.

It integrates dual power switches: a main boost switch (R_DS(on) = 0.38 Ω at VIN = 4.2 V) and a dedicated load disconnect switch (R_DS(on) = 4.2 Ω), both enabling zero-current shutdown. Peak inductor current is programmable via external RSET resistor - a feature exclusive to the STLD20D-C8 variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.8 V to 4.2 V - matches Li-ion battery discharge profile without external regulation.
LED Current Accuracy	19–21 mA at 20 mA nominal - ensures consistent brightness across temperature and supply variation.
Switching Frequency	400–600 kHz - enables use of small 10 µH shielded inductors and reduces EMI filtering burden.
OVP Threshold	17.5–20 V - protects output stage if LED string opens; 0.7 V hysteresis prevents chatter.
Shutdown Current	< 1 µA - eliminates standby drain in battery-powered devices during sleep mode.
FB Reference Voltage	0.285–0.315 V - low-voltage reference minimizes RLED power loss and improves efficiency.
Peak Inductor Current	Programmable up to 640 mA - allows optimization for inductor saturation margin and transient response.

Pinout & Package

SOT23-8L package with exposed thermal pad (pin 8 GND-connected); 2.0 mm × 2.5 mm footprint, 1.3 mm height - optimized for space-constrained handheld PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Boost switch drain	Connects to inductor and flyback diode anode; handles pulsed 640 mA peak current.
2 VOUT	Boost output node	Drives LED anodes; monitored by OVP circuit; requires ceramic output capacitor (1 µF).
3 LDS	Load disconnect switch source	Series path between VOUT and LED cathodes; opens fully in shutdown to eliminate leakage current.
4 FB	Current sense feedback input	Monitors voltage across RLED (15 Ω); 0.302 V reference sets 20 mA LED current.
5 FB	Duplicate feedback pin	Redundant FB connection for improved noise immunity and layout flexibility.
6 GND	Power and signal ground	Common return for all internal circuits; must be connected to exposed pad for thermal performance.
7 VIN	Input supply	Accepts 2.8–4.2 V; powers internal bias and gate drivers; requires 2.2 µF ceramic input capacitor.
8 SHDN	Active-low enable/dimming control	Logic-level input (VIL ≤ 0.3 V, VIH ≥ 1.2 V); supports 10 kHz PWM dimming without color shift.
RSET	Peak current programming terminal	Connects external resistor to GND to scale ILIM from 300 mA to 640 mA; STLD20D-C8 exclusive.

Key Features

Feature	Design Value
Integrated Load Disconnect Switch	Eliminates DC leakage path in shutdown, reducing system standby current to sub-µA levels.
Supply Voltage Rejection	Stabilizes LED current during battery voltage sag (e.g., 4.2 V → 3.0 V), preventing display flicker.
Programmable Peak Inductor Current	Enables precise matching of ILIM to inductor saturation rating, improving reliability under worst-case transients.
Dual Protection Architecture	OVP (18.5 V) and OTP (110 °C) with automatic restart prevent latch-up and enable robust field operation.
Small External Component Count	Requires only one 10 µH inductor, one 1 µF ceramic capacitor, one 2.2 µF input cap, and one 15 Ω RLED.

Applications

Mobile Phone Backlight

PDA/Handheld Organizer

Use Scenario: Driving 4-series white LEDs in a slim clamshell mobile phone with single-cell Li-ion battery.

IC Role / Device Role / Timing Role: Constant-current boost controller with programmable current limit and flicker-suppressing supply rejection.

Use Value: Maintains uniform brightness across 2.8–4.2 V battery range while enabling 10 kHz PWM dimming for user-adjustable screen luminance.

Use Scenario: Powering QVGA LCD backlight in a PDA with tight board area and thermal constraints.

IC Role / Device Role / Timing Role: Compact LED driver with integrated LDS switch and low-R_DS(on) power stages.

Use Value: Achieves <1 µA shutdown current and 85% efficiency at 4.2 V input, extending battery runtime by >12% versus discrete solutions.

MP3 Player Display

Electronic Toy Interface

Use Scenario: Illuminating small monochrome OLED or TFT display in portable audio player.

IC Role / Device Role / Timing Role: High-frequency (500 kHz) boost regulator with soft-start and overvoltage protection.

Use Value: Enables use of miniature 10 µH inductor and avoids audible coil whine due to fixed switching frequency above human hearing range.

Use Scenario: Providing adjustable LED illumination in battery-powered educational toy with child-safe dimming.

IC Role / Device Role / Timing Role: Digital-dimming-capable LED driver with logic-level SHDN interface and thermal fault recovery.

Use Value: Supports simple microcontroller GPIO-based brightness control and self-recovering OTP shutdown during extended play sessions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STLD20D-DEF	QFN 3×3 8L package; no RSET pin; fixed 640 mA peak current; higher R_DS(on) on LDS (4.3 Ω vs 4.2 Ω).	Preferred for thermally demanding layouts where QFN's lower R_thJA (350 °C/W vs 300 °C/W) improves thermal margin.	Select when board space allows QFN and programmability is unnecessary; not pin-compatible with STLD20D-C8.
LM3407MMX/NOPB	SO-8 package; 1.25 MHz switching; no integrated LDS; requires external MOSFET for disconnect; 200 mA max ILIM.	Suitable for lower-current (≤15 mA) or multi-string configurations; lacks OVP/OTP auto-restart.	Choose only if higher frequency or SO-8 assembly is required; adds BOM cost and layout complexity for disconnect function.

Compared with STLD20D-DEF and LM3407MMX/NOPB, the STLD20D-C8 uniquely combines SOT23-8L compactness, RSET-based current tuning, and fully integrated protection - making it optimal for cost-sensitive, space-constrained single-string backlight designs requiring production-ready robustness.

Availability

STLD20D-C8 is available at Aetrix Electronics and suitable for mobile phone backlight, PDA display, and MP3 player illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STLD20D-C8 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in analog, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The STLD20D product line delivers highly integrated, application-optimized LED drivers for portable displays - emphasizing minimal external components, battery-aware efficiency, and flicker-free operation in resource-constrained devices.

FAQ

What is the minimum recommended RLED value for STLD20D-C8?

The datasheet specifies RLED = 15 Ω for 20 mA LED current, yielding 0.302 V across FB. Using lower resistance risks exceeding the 21 mA maximum regulated current and may compromise accuracy. Values below 12 Ω are not characterized and may cause instability or overcurrent stress on the LDS switch.

Can STLD20D-C8 drive more than 4 white LEDs?

No - the device is characterized and guaranteed for up to 4 white LEDs (typically 16 V total forward voltage). Attempting to drive 5+ LEDs exceeds the 20 V OVP threshold and risks triggering continuous protection shutdown. Output voltage headroom is insufficient beyond N·V_LED ≈ 16 V at nominal conditions.

Is the RSET pin required to be connected for basic operation?

No - leaving RSET unconnected (open) or tied to GND defaults to the maximum 640 mA peak inductor current. The RSET resistor is optional and used only when reducing ILIM for inductor derating or thermal optimization; it does not affect startup or regulation functionality.

Does STLD20D-C8 support analog dimming in addition to PWM?

Yes - analog dimming is supported by injecting a DC voltage into the FB pin via an external resistor divider (Rd1/Rdim), as detailed in Section 9 of the datasheet. This method reduces average LED current linearly but trades off color consistency versus PWM dimming, which maintains full-current pulses for stable chromaticity.

STLD20D-C8 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SOT-23-8

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: DC DC Regulator

Topology:: Step-Up (Boost)

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 2.8V

Voltage - Supply (Max):: 4.2V

Voltage - Output:: -

Current - Output / Channel:: 21mA

Frequency:: 500kHz

Dimming:: Analog, PWM

Applications:: Backlight

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-8

STLD20D-C8 FAQ

1.How can I place an order for STLD20D-C8 through Aetrix?

Please submit a Request for Quotation (RFQ) for STLD20D-C8 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 STLD20D-C8 reliable?

The price and inventory of STLD20D-C8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLD20D-C8 is usually 5 days.

3.What payment methods are accepted for STLD20D-C8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLD20D-C8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STLD20D-C8?

STLD20D-C8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STLD20D-C8 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 STLD20D-C8?

For technical support, including STLD20D-C8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLD20D-C8 requirements.

6.How does Aetrix verify that STLD20D-C8 is sourced from the original manufacturer or authorized distributors?

All STLD20D-C8 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 STLD20D-C8 meets industry standards.

7.What is the process for return or replacement of STLD20D-C8?

All STLD20D-C8 units undergo pre-shipment inspection (PSI). If there is an issue with STLD20D-C8, 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 STLD20D-C8 part is unused and in its original packaging.

Return procedure for STLD20D-C8:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…