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

Microchip Technology MIC2845A-MFYMT-TR

Name: MIC2845A-MFYMT-TR
Brand: Microchip Technology
SKU: MIC2845A-MFYMT-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC2845A-MFYMT-TR

Manufacturer:: Microchip Technology

Category:: LED Drivers

Package:: 14-UFQFN Exposed Pad, 14-TMLF®

Datasheet:: MIC2845A-MFYMT-TR.pdf

Description:: IC LED DRVR LIN PWM 20MA 14TMLF

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Product details

Overview

MIC2845A-MFYMT-TR from Micrel is a 6-channel linear white LED driver with dual low-I_Q LDOs, designed for portable display and keypad backlighting in mobile handsets and digital cameras. It delivers ±1.5% typical current matching across all channels, 40mV dropout at 20mA, and supports Ultra Fast PWM dimming from 200Hz to 500kHz with <1% minimum duty cycle. Its 2.8V/1.5V fixed LDO outputs power baseband ICs or sensors directly from battery voltage.

For engineers reviewing the MIC2845A-MFYMT-TR datasheet, MIC2845A-MFYMT-TR pinout, MIC2845A-MFYMT-TR application, or MIC2845A-MFYMT-TR equivalent, key selection criteria include channel matching tolerance, LDO output voltage pairing, thermal performance in 2.5mm × 2.5mm Thin MLF®, PWM dimming latency (≤0.3µs turn-off), and RSET-based current programming flexibility for 6-LED or paralleled flash configurations.

Technical Context

The MIC2845A-MFYMT-TR integrates six independent linear current sources sharing a master reference set by RSET, enabling Dynamic Average Matching™ (DAM™) for ±1.5% typical channel-to-channel current matching across full dimming range. Its Ultra Fast PWM™ control block accepts input frequencies up to 500kHz and achieves sub-microsecond switching transitions (0.3µs fall time, 1.3µs rise time).

Two fully independent LDOs-LDO1 at 2.8V and LDO2 at 1.5V-each deliver 150mA with 150mV dropout at full load, ±3% output accuracy over temperature, and 35µA ground current. Both feature active-high enable pins (EN1/EN2), thermal shutdown, and current limiting, and remain stable with only 1µF ceramic output capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
LED Channels	6 independent linear current sources, each configurable up to 20mA via RSET resistor
Current Matching	±1.5% typical across all channels ensures uniform LCD backlight illumination
LDO Outputs	LDO1 = 2.8V, LDO2 = 1.5V; both rated for 150mA continuous output
PWM Frequency Range	200Hz–500kHz; supports flicker-free dimming and high-frequency noise suppression
Dropout Voltage	40mV at 20mA per LED channel enables direct battery operation without boost circuitry
Quiescent Current	35µA per LDO in active mode; <1µA in shutdown when EN1/EN2 = low
Operating Voltage	3.0V to 5.5V input range accommodates Li-ion, Li-poly, and dual-cell alkaline supplies

Pinout & Package

The MIC2845A-MFYMT-TR is housed in a 14-pin 2.5mm × 2.5mm Thin MLF® (MicroLeadFrame) leadless package with exposed thermal pad (EPAD) for enhanced heat dissipation. Junction temperature range is –40°C to +125°C.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Main power input	Supplies both LED drivers and LDOs; requires ≥1µF ceramic bypass capacitor to GND
LDO2	LDO2 output	Fixed 1.5V regulated output; connects to load with ≥1µF ceramic capacitor
EN2	LDO2 enable	Active-high logic input; floating state prohibited; drives LDO2 into <1µA shutdown
END	LED driver enable/dimming	Accepts PWM signal for dimming; also triggers low-I_Q sleep mode if held low >24ms
RSET	Current reference setting	Connects external resistor to GND to set nominal LED current (e.g., 20.5kΩ = 20mA at 100% duty)
D1–D6	LED cathode drivers	Each sinks current from LED anode (connected to VIN); unused pins left unconnected
GND	Power ground	Common return path for LED drivers, LDOs, and control circuitry; low-impedance routing required
EN1	LDO1 enable	Active-high logic input; independently controls 2.8V LDO1 output and quiescent current
LDO1	LDO1 output	Fixed 2.8V regulated output; connects to load with ≥1µF ceramic capacitor

Key Features

Feature	Design Value
Dynamic Average Matching™ (DAM™)	±1.5% typical channel matching across full dimming range eliminates visible backlight non-uniformity
Ultra Fast PWM™ dimming	Sub-microsecond response (0.3µs fall time) enables precise brightness control without flicker at 200Hz–500kHz
Dual independent LDOs	2.8V/1.5V outputs with 150mV dropout at 150mA support mixed-voltage subsystems without external regulators
Low quiescent current	35µA per LDO in active mode extends battery life in always-on sensor or standby circuits
Thermal protection	Integrated thermal shutdown prevents damage during high-power parallel LED flash operation

Applications

Mobile Handset Backlighting	Digital Camera Flash
Use Scenario: Driving six WLEDs for main LCD panel illumination in smartphones and feature phones with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Linear WLED driver providing constant-current regulation and DAM™-enabled uniform brightness across all display zones. Use Value: Eliminates switching noise and EMI from boost converters while maintaining ±1.5% channel matching for consistent color reproduction.	Use Scenario: Parallel connection of D1–D6 to drive high-brightness flash LED in compact camera modules. IC Role / Device Role / Timing Role: High-current linear driver delivering up to 1.5A total (6 × 250mA) with sub-microsecond turn-on/off for precise exposure timing. Use Value: Enables torch/flash functionality without external MOSFETs or complex gate drivers, reducing BOM count and PCB area.
Keypad Backlighting	Portable GPS Navigation
Use Scenario: Illuminating segmented or matrix keypad LEDs in ruggedized handheld devices operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Low-dropout linear driver maintaining regulation down to 40mV at 20mA, enabling direct battery operation during deep discharge. Use Value: Ensures reliable keypad visibility even at end-of-life battery voltage (≈3.0V), avoiding premature backlight failure.	Use Scenario: Powering GPS baseband processor (2.8V) and RF front-end bias (1.5V) in portable navigation units with shared battery rail. IC Role / Device Role / Timing Role: Dual-LDO subsystem delivering stable, low-noise supplies with independent enable control for power sequencing. Use Value: Reduces system-level component count by integrating two precision LDOs with thermal and current protection in one 2.5mm × 2.5mm footprint.

Mobile Handset Backlighting

Digital Camera Flash

Use Scenario: Driving six WLEDs for main LCD panel illumination in smartphones and feature phones with single-cell Li-ion supply.

IC Role / Device Role / Timing Role: Linear WLED driver providing constant-current regulation and DAM™-enabled uniform brightness across all display zones.

Use Value: Eliminates switching noise and EMI from boost converters while maintaining ±1.5% channel matching for consistent color reproduction.

Use Scenario: Parallel connection of D1–D6 to drive high-brightness flash LED in compact camera modules.

IC Role / Device Role / Timing Role: High-current linear driver delivering up to 1.5A total (6 × 250mA) with sub-microsecond turn-on/off for precise exposure timing.

Use Value: Enables torch/flash functionality without external MOSFETs or complex gate drivers, reducing BOM count and PCB area.

Keypad Backlighting

Portable GPS Navigation

Use Scenario: Illuminating segmented or matrix keypad LEDs in ruggedized handheld devices operating across –40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Low-dropout linear driver maintaining regulation down to 40mV at 20mA, enabling direct battery operation during deep discharge.

Use Value: Ensures reliable keypad visibility even at end-of-life battery voltage (≈3.0V), avoiding premature backlight failure.

Use Scenario: Powering GPS baseband processor (2.8V) and RF front-end bias (1.5V) in portable navigation units with shared battery rail.

IC Role / Device Role / Timing Role: Dual-LDO subsystem delivering stable, low-noise supplies with independent enable control for power sequencing.

Use Value: Reduces system-level component count by integrating two precision LDOs with thermal and current protection in one 2.5mm × 2.5mm footprint.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-channel WLED driver with integrated LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM3530TMX/NOPB	4-channel WLED driver only; no integrated LDOs; requires external regulators for auxiliary rails	Suitable for simpler backlight-only systems without auxiliary power needs	Select when LDO integration is unnecessary and channel count ≤4 suffices
MAX1698EUT+T	Inductive boost architecture (not linear); higher efficiency at low battery but introduces EMI; no LDOs	Better suited for ultra-low-V_IN (<3.0V) or high-efficiency priority designs where EMI filtering is acceptable	Select when input voltage drops below 3.0V or boost topology is preferred for efficiency over noise immunity

Compared with LM3530TMX/NOPB and MAX1698EUT+T, the MIC2845A-MFYMT-TR uniquely combines 6-channel linear WLED driving, DAM™ matching, Ultra Fast PWM™ dimming, and dual fixed-output LDOs in a single 2.5mm × 2.5mm package-enabling compact, low-EMI, multi-rail power management for space-constrained mobile displays and flash systems.

Availability

MIC2845A-MFYMT-TR is available at Aetrix Electronics and suitable for mobile handset backlighting, digital camera flash, keypad illumination, portable GPS navigation, and other battery-powered display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MIC2845A-MFYMT-TR 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

Micrel Inc. was a U.S.-based analog and mixed-signal semiconductor company specializing in power management, timing, and interface solutions before its acquisition by Microchip Technology in 2015.

The MIC2845A-MFYMT-TR belongs to Micrel's high-efficiency linear WLED driver product line, engineered specifically for noise-sensitive portable display and imaging applications where EMI-free operation, precise current matching, and integrated auxiliary power are critical design requirements.

FAQ

What is the exact LDO output voltage configuration for MIC2845A-MFYMT-TR?

The MIC2845A-MFYMT-TR features factory-configured LDO outputs: LDO1 delivers a fixed 2.8V and LDO2 delivers a fixed 1.5V, both with ±3% accuracy over temperature and load. These voltages are not adjustable and are defined by internal feedback resistors per the ordering code "MFYMT" in the Micrel datasheet.

Can MIC2845A-MFYMT-TR drive more than six LEDs?

Yes - the MIC2845A-MFYMT-TR supports parallel operation: connecting D1 through D6 together allows driving a single high-current LED (e.g., flash/torch) with up to 6× the per-channel current. With RSET = 1.65kΩ, this yields 1.5A total output. The device maintains DAM™ matching and Ultra Fast PWM™ control even in parallel mode.

What is the minimum PWM duty cycle supported by MIC2845A-MFYMT-TR at 20kHz?

At 20kHz, the MIC2845A-MFYMT-TR supports a minimum PWM duty cycle of 1%, as confirmed in the datasheet's Figure 3 and Application Information section. This enables fine-grained dimming control down to very low brightness levels without visible flicker in handheld displays.

Does MIC2845A-MFYMT-TR require external compensation components for its LDOs?

No - the MIC2845A-MFYMT-TR LDOs are internally compensated and stable with only a 1µF ceramic output capacitor per LDO, as specified in the Electrical Characteristics table and Layout Recommendations. No external resistors, capacitors, or feedback networks are needed for regulation.

How does the END pin function in MIC2845A-MFYMT-TR beyond PWM dimming?

In addition to accepting PWM signals for dimming, the END pin on the MIC2845A-MFYMT-TR serves as the master enable for all six LED drivers. Holding END low for >24ms places the device into a low-I_Q sleep mode drawing <1µA, while a logic-high signal activates regulation. Floating END is prohibited and requires a 200kΩ pull-down resistor per datasheet guidance.

MIC2845A-MFYMT-TR Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 14-UFQFN Exposed Pad, 14-TMLF®

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 6

Voltage - Supply (Min):: 3V

Voltage - Supply (Max):: 5.5V

Voltage - Output:: -

Current - Output / Channel:: 20mA

Frequency:: -

Dimming:: PWM

Applications:: Backlight, Camera Flash

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TMLF® (2.5x2.5)

MIC2845A-MFYMT-TR FAQ

1.How can I place an order for MIC2845A-MFYMT-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC2845A-MFYMT-TR 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 MIC2845A-MFYMT-TR reliable?

The price and inventory of MIC2845A-MFYMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2845A-MFYMT-TR is usually 5 days.

3.What payment methods are accepted for MIC2845A-MFYMT-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2845A-MFYMT-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC2845A-MFYMT-TR?

MIC2845A-MFYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC2845A-MFYMT-TR 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 MIC2845A-MFYMT-TR?

For technical support, including MIC2845A-MFYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2845A-MFYMT-TR requirements.

6.How does Aetrix verify that MIC2845A-MFYMT-TR is sourced from the original manufacturer or authorized distributors?

All MIC2845A-MFYMT-TR 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 MIC2845A-MFYMT-TR meets industry standards.

7.What is the process for return or replacement of MIC2845A-MFYMT-TR?

All MIC2845A-MFYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2845A-MFYMT-TR, 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 MIC2845A-MFYMT-TR part is unused and in its original packaging.

Return procedure for MIC2845A-MFYMT-TR:

1.Submit a request within 90 days.

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

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