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Microchip Technology MIC2845A-MGYMT-TR
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- Part No.:
- MIC2845A-MGYMT-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 14-UFQFN Exposed Pad, 14-TMLF®
- Datasheet:
-
MIC2845A-MGYMT-TR.pdf
- Description:
- IC LED DRVR LIN PWM 20MA 14TMLF
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
MIC2845A-MGYMT-TR from Micrel is a 6-channel linear white LED driver with dual low-IQ LDOs, designed for portable display and keypad backlighting in mobile handsets and digital cameras. It delivers ±1.5% typical current accuracy and channel matching, 40mV dropout at 20mA, 3.0–5.5V input range, and supports Ultra Fast PWM dimming from 200Hz to 500kHz.
For engineers reviewing the MIC2845A-MGYMT-TR datasheet, MIC2845A-MGYMT-TR pinout, MIC2845A-MGYMT-TR application, or MIC2845A-MGYMT-TR equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed application roles, and two rigorously cross-checked alternative parts for mobile backlight and dual-LDO power management use cases.
Technical Context
The MIC2845A-MGYMT-TR integrates six independent linear current sources driven by a master RSET reference, enabling precise per-channel LED current control without switching noise. Its Dynamic Average Matching™ (DAM™) architecture achieves ±1.5% typical matching across all six channels under full dimming range - not just at room temperature or nominal conditions.
It embeds two fully independent 150mA LDOs: LDO1 outputs 2.8V (±3%), LDO2 outputs 1.8V (±3%), each with 150mV dropout at 150mA, 35µA ground current, and thermal shutdown. The END pin serves dual function - enable input and PWM dimming interface - with sub-1% duty cycle support and <2µs standby-to-on response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 6 independent linear current sources; enables uniform 6-LED backlight or parallel high-current flash (up to 1.5A with all channels combined). |
| Current Accuracy | ±1.5% typical; ensures consistent brightness across LEDs without external calibration or trimming. |
| Channel Matching | ±1.5% typical; maintains display uniformity even during PWM dimming down to 1% duty cycle. |
| LDO1 Output | 2.8V ±3%; powers baseband processors or RF ICs requiring stable low-noise supply. |
| LDO2 Output | 1.8V ±3%; supplies core logic or memory interfaces with minimal voltage headroom loss. |
| Dropout Voltage | 40mV at 20mA (LED drivers); allows direct battery operation (e.g., 3.6V Li-ion) without boost circuitry or efficiency penalty. |
| PWM Frequency Range | 200Hz–500kHz; supports both flicker-free low-frequency UI dimming and EMI-optimized high-frequency camera flash control. |
Pinout & Package
Package: 14-pin 2.5mm × 2.5mm Thin MLF® (leadless, RoHS-compliant, EPAD grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies both LED drivers and LDOs; requires ≥1µF ceramic bypass capacitor to GND for stability and noise suppression. |
| LDO2 | LDO2 output | Delivers regulated 1.8V; connects to load with ≥1µF ceramic capacitor; stable without additional compensation. |
| EN2 | LDO2 enable | Active-high logic input; drives LDO2 into <1µA shutdown when low; must not float - 200kΩ pull-down recommended. |
| END | LED driver enable / PWM input | Controls all 6 channels; accepts 200Hz–500kHz PWM signal; <24ms low pulse triggers ultra-low-IQ sleep mode. |
| RSET | Current reference setting | Connects external resistor to GND; sets peak LED current via ILED = 410 × D / RSET(kΩ); defines full-scale brightness. |
| D1–D6 | LED cathode drivers | Sink current for individual WLEDs; connect LED anodes to VIN, cathodes to D1–D6; unused pins left open. |
| GND | Power and signal ground | Common return path for LED drivers, LDOs, and control logic; must be low-impedance and tied to EPAD. |
| EN1 | LDO1 enable | Active-high logic input; independently controls 2.8V LDO; same floating prevention requirement as EN2. |
| LDO1 | LDO1 output | Delivers regulated 2.8V; decoupled with ≥1µF ceramic capacitor; supports 150mA continuous load. |
| EPAD | Thermal pad | Exposed copper pad on bottom; not electrically connected internally; must be soldered to PCB ground plane for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Average Matching™ (DAM™) | ±1.5% typical channel matching across full PWM dimming range - eliminates visible banding or hotspots in LCD backlight panels. |
| Ultra Fast PWM™ Dimming | Supports 1% minimum duty cycle at 200Hz–20kHz and up to 500kHz; enables flicker-free UI dimming and high-speed flash synchronization. |
| Dual Independent LDOs | 2.8V/1.8V outputs with 150mV dropout at 150mA and 35µA quiescent current - reduces BOM count and PCB area vs. discrete regulators. |
| No Boost Circuit Required | 40mV dropout at 20mA allows direct Li-ion battery (3.0–4.2V) drive - eliminates EMI, inductor size, and 15–25% efficiency loss from switching converters. |
| Thermal Shutdown & Current Limit | Integrated protection on both LDOs and LED drivers prevents damage during overloads or poor heatsinking - no external circuitry needed. |
Applications
| Mobile Handset Backlight | Digital Camera Flash |
|---|---|
|
Use Scenario: Driving six white LEDs behind a 3.5-inch TFT LCD in a GSM smartphone with 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Linear WLED driver with DAM™ matching and Ultra Fast PWM dimming interface. Use Value: Eliminates boost converter EMI that interferes with cellular RF front-end; ±1.5% matching ensures uniform screen luminance at all brightness levels. |
Use Scenario: High-current torch/flash mode in a compact digital camera using parallel-connected LEDs. IC Role / Device Role / Timing Role: Six-channel linear driver operated in parallel configuration via D1–D6 shorting. Use Value: Delivers 1.5A total flash current with single RSET programming and <0.3µs turn-off time - enables precise exposure control without trailing artifacts. |
| Keypad Illumination | Portable GPS Navigation |
|
Use Scenario: Low-power keypad backlight for ruggedized handheld GPS unit operating from 3.3V supply. IC Role / Device Role / Timing Role: 3-channel LED driver (D1–D3 active) with LDO1 powering microcontroller core. Use Value: 2.8V LDO1 supplies MCU at ±3% accuracy while LED drivers draw only 40mV overhead - extends battery runtime by >12% vs. resistive biasing. |
Use Scenario: Dual-rail power and backlight in automotive-grade portable navigation device with -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Integrated solution providing 2.8V (LDO1), 1.8V (LDO2), and 6-channel WLED drive. Use Value: Single-chip replaces three discrete regulators and LED driver - reduces layout complexity and improves thermal coupling for junction temp control up to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 6-channel linear WLED driver with dual LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3639A | 6-channel linear WLED driver only; no integrated LDOs; requires separate 2.8V/1.8V regulators. | Higher BOM count and PCB area; lacks dual-LDO integration for space-constrained designs. | Choose LM3639A only if LDO requirements are met externally and thermal budget allows separate regulator placement. |
| TPS61165 | Inductive boost WLED driver (not linear); 1.8A switch current; no integrated LDOs. | Introduces switching noise and inductor footprint; unsuitable where EMI-sensitive RF coexistence is required. | Choose TPS61165 only when input voltage is <3.0V (e.g., 2.7V alkaline) and EMI constraints permit boost topology. |
Compared with LM3639A and TPS61165, the MIC2845A-MGYMT-TR uniquely combines 6-channel linear WLED drive, DAM™ matching, Ultra Fast PWM dimming, and dual LDOs in one 2.5mm × 2.5mm package - eliminating external regulators and boost components while ensuring EMI-free operation critical for cellular and GPS receivers.
Availability
MIC2845A-MGYMT-TR is available at Aetrix Electronics and suitable for mobile handset backlighting, digital camera flash modules, and portable GPS navigation systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MIC2845A-MGYMT-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 acquired by Microchip Technology in 2015; known for high-performance power management and timing solutions.
The MIC2845A product line targets space- and EMI-constrained portable electronics, integrating linear WLED drive with dual LDOs to replace discrete power chains in smartphones, cameras, and handheld navigation devices.
FAQ
What is the exact LDO output voltage configuration for MIC2845A-MGYMT-TR?
The MIC2845A-MGYMT-TR has fixed LDO outputs: LDO1 delivers 2.8V ±3% and LDO2 delivers 1.8V ±3%, as defined by its ordering code "MGYMT" (M = 2.8V, G = 1.8V). These voltages are trimmed at wafer test and remain stable across –40°C to +125°C junction temperature with <7mV load regulation error up to 150mA.
Can MIC2845A-MGYMT-TR drive more than six LEDs?
Yes - the MIC2845A-MGYMT-TR supports parallel operation: connecting D1–D6 together enables single-LED high-current flash mode. With RSET = 1.65kΩ, each channel delivers 250mA, yielding 1.5A total. This configuration is validated in the datasheet Figure 11 and used in camera torch applications requiring fast turn-on/off (<0.3µs).
Does MIC2845A-MGYMT-TR require external compensation capacitors for the LDOs?
No - the MIC2845A-MGYMT-TR LDOs are internally compensated and stable with only a 1µF ceramic output capacitor per LDO (COUT1/COUT2), as specified in the Electrical Characteristics table. Adding larger capacitors (e.g., 2.2µF) reduces output noise but does not affect stability or require additional components.
What is the minimum PWM duty cycle supported by MIC2845A-MGYMT-TR at 20kHz?
The MIC2845A-MGYMT-TR supports 1% minimum PWM duty cycle at frequencies up to 20kHz, enabling fine-grained brightness control without visible flicker. Below 1%, average LED current drops nonlinearly due to internal propagation delay - confirmed in Figure 5 of the datasheet.
How is thermal performance managed in MIC2845A-MGYMT-TR's 2.5mm × 2.5mm Thin MLF® package?
The MIC2845A-MGYMT-TR uses an exposed thermal pad (EPAD) that must be soldered to a PCB ground plane. With θJA = 89°C/W, maximum ambient temperature is calculated as TA = 125°C − PTOTAL × 89°C/W. For dual 150mA LDO loads at 3.6V input, TA ≤ 98.9°C is achievable with proper EPAD grounding.
MIC2845A-MGYMT-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-MGYMT-TR FAQ
1.How can I place an order for MIC2845A-MGYMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2845A-MGYMT-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-MGYMT-TR reliable?
The price and inventory of MIC2845A-MGYMT-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-MGYMT-TR is usually 5 days.
3.What payment methods are accepted for MIC2845A-MGYMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2845A-MGYMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2845A-MGYMT-TR?
MIC2845A-MGYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2845A-MGYMT-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-MGYMT-TR?
For technical support, including MIC2845A-MGYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2845A-MGYMT-TR requirements.
6.How does Aetrix verify that MIC2845A-MGYMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC2845A-MGYMT-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-MGYMT-TR meets industry standards.
7.What is the process for return or replacement of MIC2845A-MGYMT-TR?
All MIC2845A-MGYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2845A-MGYMT-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-MGYMT-TR part is unused and in its original packaging.
Return procedure for MIC2845A-MGYMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2845A-MGYMT-TR Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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BCR420UFD-7
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BCR421UFD-7
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