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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

STMicroelectronics SEA05LTR

Name: SEA05LTR
Brand: STMicroelectronics
SKU: SEA05LTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SEA05LTR

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: SOT-23-6

Datasheet:: SEA05LTR.pdf

Description:: IC CTLR CV/CC LED DVR SOT-23-6

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SEA05LTR from STMicroelectronics is a constant voltage and constant current controller IC with integrated LED pilot-lamp driver, designed for secondary-side feedback in AC-DC adapters, battery chargers, and SMPS. It features dual op-amp control loops (±0.5% voltage accuracy, ±4% current accuracy), 50 mV current sense threshold, 2.5 V internal reference, and 250 µA quiescent current.

For engineers reviewing the SEA05LTR datasheet, SEA05LTR pinout, SEA05LTR application, or SEA05LTR equivalent, this device serves as a space-constrained, low-standby-power solution for dual-loop regulation with integrated LED drive via pulsed open-drain output at 1 kHz / 12.5% duty cycle.

Technical Context

The SEA05LTR integrates two transconductance op-amps with OR-ed open-drain outputs - one for voltage regulation (inverting input at Vctrl, 2.5 V reference) and one for current regulation (inverting input at Isense, 50 mV threshold). Both loops share the OUT pin to enable priority-based error signaling.

The LD pin implements a dedicated 1 kHz square-wave oscillator driving an internal MOSFET with 12.5% duty cycle, enabling peak-current-driven LED pilot-lamp operation while reducing average power consumption. UVLO activation occurs at ~3 V on VCC, and the LD stage remains high-impedance below that threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	3.5 V to 36 V - supports wide-input offline and battery-fed SMPS without external LDO
I_Q	250 µA typ. - enables ultra-low standby power in energy-efficient adapters
Voltage Ref	2.5 V ±0.48% - trimmed bandgap reference enabling precise CV setpoint definition
Current Sense Threshold	50 mV ±2 mV - sets CC limit with minimal sensing resistor power loss (e.g., 50 mΩ @ 1 A)
LD Drive Frequency	1 kHz ±0.4 kHz - eliminates visible LED flicker while maintaining low average current
OUT Sink Current	20 mA max - sufficient to directly drive optocoupler photodiode branches
LD Peak Sink Current	10 mA - delivers full LED brightness during 125 µs ON time per cycle

Pinout & Package

SOT23-6L plastic package (2.90 mm × 2.80 mm), ECOPACK® compliant, with exposed pad not connected internally.

Pin/Terminal	Circuit Role	Design Meaning
1 - Isense	Inverting input of current-loop op-amp	Connects to high-side of sense resistor; triggers CC regulation when voltage exceeds 50 mV
2 - GND	Device ground reference	0 V return for bias currents; must be tied near converter output ground to avoid load-induced CV error
3 - Vctrl	Inverting input of voltage-loop op-amp	Connects to resistor divider midpoint; regulates output voltage to 2.5 V × (1 + R1/R2)
4 - LD	Pulsed open-drain LED driver output	Internally switches at 1 kHz / 12.5% duty cycle; sinks up to 10 mA peak for efficient pilot-lamp drive
5 - OUT	OR-ed open-drain output of both op-amps	Drives optocoupler photodiode; activates when either CV or CC loop detects over-regulation
6 - VCC	Supply input	Accepts 3.5–36 V; requires local 0.1 µF bypass capacitor; enables LD only above ~3 V UVLO

Key Features

Feature	Design Value
Dual independent control loops	Separate voltage and current op-amps with shared OUT enable fail-safe regulation - if either loop trips, feedback is asserted
Integrated LED pilot-lamp driver	LD pin delivers 1 kHz pulsed current (12.5% duty cycle) to reduce average LED power by >87% vs. DC drive
Low-quiescent-current design	250 µA ICC enables compliance with <300 mW no-load power standards in Class VI adapters
High-precision internal reference	2.5 V bandgap trimmed to ±0.48% at 25°C ensures stable CV/CC setpoints across temperature and line
Open-drain output architecture	OUT and LD pins support flexible interfacing with optocouplers and external pull-ups without level-shifting

Applications

AC-DC Adapters

Battery Chargers

Use Scenario: Wall-mounted 5–24 V output adapter powering consumer electronics with status LED indication.

IC Role / Device Role / Timing Role: Secondary-side CV/CC controller providing isolated feedback and LED pilot drive via single IC.

Use Value: Eliminates discrete LED driver and separate error amplifier, reducing BOM count by ≥3 components and PCB area by >25 mm².

Use Scenario: USB-C PD or proprietary fast-charging brick with charge-status LED and tight output tolerance.

IC Role / Device Role / Timing Role: Regulates constant-voltage phase and transitions to constant-current mode during CC charging, while pulsing LED to indicate state.

Use Value: Maintains ±0.5% CV accuracy and ±4% CC accuracy while cutting LED standby power to <100 µW average.

SMPS for Industrial IoT

Medical Power Supplies

Use Scenario: Compact 12 V/1 A isolated SMPS powering sensor nodes with power-on LED indicator.

IC Role / Device Role / Timing Role: Provides dual-loop regulation and LED drive in SOT23-6L footprint - critical for space-constrained modules.

Use Value: Enables full regulation + LED function in <5 mm² board area, supporting UL62368-1 creepage/clearance via compact layout.

Use Scenario: Low-noise 5 V/2 A medical-grade power supply requiring LED status and strict no-load power limits.

IC Role / Device Role / Timing Role: Delivers CV/CC regulation with 250 µA quiescent current and flicker-free LED indication meeting IEC 60601-1 visual requirements.

Use Value: Meets <150 mW no-load power requirement while ensuring LED remains perceptibly lit under all operating conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant voltage and constant current controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC28711DR	Single-loop (CV-only) flyback controller with integrated HV start-up; no native CC loop or LED driver	Requires external current-sense circuit and discrete LED driver; higher component count	Select when primary-side regulation suffices and secondary-side integration is not required
TSM1052	CV/CC controller with 100 mV current sense threshold and no integrated LED driver; SOT23-5 package	Lacks pulsed LD output - needs external transistor/MOSFET for LED drive; lower current accuracy (±8%)	Select when LED drive is handled separately and cost sensitivity outweighs standby power optimization

Compared with UCC28711DR and TSM1052, SEA05LTR uniquely integrates dual-loop regulation, precision 50 mV current sensing, and a dedicated 1 kHz pulsed LED driver in SOT23-6L - delivering lowest BOM count and best standby power performance for space-constrained adapter and charger designs.

Availability

SEA05LTR is available at Aetrix Electronics and suitable for AC-DC adapters, battery chargers, and industrial SMPS requiring stable component supply, low-standby-power certification, and compact secondary-side feedback solutions.

Supply support for SEA05LTR 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, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The SEA05LTR belongs to ST's secondary-side SMPS controller product line, engineered specifically to simplify isolated power supply design by integrating dual-loop regulation and LED pilot functionality into a single SOT23-6L device.

FAQ

What is the purpose of the LD pin and how is it driven?

The LD pin is a dedicated open-drain output that drives an external LED pilot lamp using a built-in 1 kHz square-wave oscillator with 12.5% duty cycle. It sinks up to 10 mA peak current and activates only when VCC exceeds ~3 V. This pulsed operation reduces average LED power consumption by over 87% compared to DC drive while eliminating visible flicker.

How does the SEA05LTR implement dual-loop CV/CC regulation?

It uses two independent transconductance op-amps: one monitors output voltage via Vctrl (with 2.5 V reference) and the other monitors output current via Isense (with 50 mV threshold). Their open-drain outputs are wired-OR'd to the OUT pin, so either loop can assert feedback to the optocoupler - ensuring immediate response to overvoltage or overcurrent events.

Can the SEA05LTR operate with output voltages below 5 V?

Yes - the VCC supply range (3.5 V to 36 V) is independent of output voltage. The IC operates from auxiliary winding or bias supply, not the main output. For low-V_OUT designs (e.g., 3.3 V), ensure the auxiliary winding provides ≥3.5 V to VCC and that the resistor divider on Vctrl is scaled to maintain 2.5 V at the pin under regulation.

What compensation components are required for stable operation?

Both control loops require external RC networks: one between Vctrl and OUT for voltage-loop compensation, and another between Isense and OUT for current-loop compensation. ST recommends starting with 10 kΩ + 1 nF for each, then adjusting based on measured phase margin. Full compensation guidelines are provided in Section 2.2 of Doc ID 18462 Rev 1.

SEA05LTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SOT-23-6

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Controller, ACDC Switching Power Supplies

Current - Supply:: 200µA

Voltage - Supply:: 3.5V ~ 36V

Operating Temperature:: -25°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-6

SEA05LTR FAQ

1.How can I place an order for SEA05LTR through Aetrix?

Please submit a Request for Quotation (RFQ) for SEA05LTR 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 SEA05LTR reliable?

The price and inventory of SEA05LTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SEA05LTR is usually 5 days.

3.What payment methods are accepted for SEA05LTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SEA05LTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SEA05LTR?

SEA05LTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SEA05LTR 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 SEA05LTR?

For technical support, including SEA05LTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SEA05LTR requirements.

6.How does Aetrix verify that SEA05LTR is sourced from the original manufacturer or authorized distributors?

All SEA05LTR 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 SEA05LTR meets industry standards.

7.What is the process for return or replacement of SEA05LTR?

All SEA05LTR units undergo pre-shipment inspection (PSI). If there is an issue with SEA05LTR, 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 SEA05LTR part is unused and in its original packaging.

Return procedure for SEA05LTR:

1.Submit a request within 90 days.

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

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