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Microchip Technology MIC2845A-SCYMT-TR
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- Part No.:
- MIC2845A-SCYMT-TR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 14-UFQFN Exposed Pad, 14-TMLF®
- Datasheet:
-
MIC2845A-SCYMT-TR.pdf
- Description:
- IC LED DRVR LIN PWM 20MA 14TMLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,560
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Product details
Overview
MIC2845A-SCYMT-TR from Micrel is a 6-channel linear white LED (WLED) driver with dual low-IQ LDOs, designed for portable display and keypad backlighting and camera flash applications. It delivers ±1.5% typical current matching across all six channels, 40 mV dropout at 20 mA per channel, and supports Ultra Fast PWM™ dimming from 200 Hz to 500 kHz. Its 3.0–5.5 V input range and direct battery drive eliminate switching noise and boost losses.
For engineers reviewing the MIC2845A-SCYMT-TR datasheet, MIC2845A-SCYMT-TR pinout, MIC2845A-SCYMT-TR application, or MIC2845A-SCYMT-TR equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for WLED/LDO integration in space-constrained mobile systems.
Technical Context
The MIC2845A-SCYMT-TR integrates six independent linear current sources with Dynamic Average Matching™ (DAM™) architecture, achieving <±1.5% channel-to-channel current matching across full dimming range. Each channel regulates LED current via external RSET resistor and responds to PWM signals applied to the END pin with sub-microsecond turn-on/turn-off timing (2 µs standby-to-on, 0.3 µs on-to-standby).
It embeds two fully independent 150 mA LDOs - LDO1 fixed at 3.3 V and LDO2 fixed at 1.0 V - each featuring ±3% output accuracy, 150 mV dropout at 150 mA, and 35 µA typical ground current. Both LDOs support 1 µF ceramic output capacitors and include thermal shutdown and current limit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Channels | 6 independent linear current sources, enabling uniform backlighting for 6-segment LCDs or parallel high-current flash operation. |
| Current Matching | ±1.5% typical across all channels - ensures consistent brightness without software calibration in multi-LED displays. |
| Dropout Voltage | 40 mV at 20 mA per channel - allows direct Li-ion battery (3.0–4.2 V) drive without voltage boost, eliminating EMI and efficiency loss. |
| PWM Frequency Range | 200 Hz to 500 kHz - supports both flicker-free low-frequency dimming and ultra-fast high-frequency control for noise-sensitive audio/video systems. |
| LDO1 Output | 3.3 V ±3% - powers RF transceivers or microcontrollers requiring stable mid-rail supply with minimal board area. |
| LDO2 Output | 1.0 V ±3% - supplies core logic or low-voltage I/O rails in modern SoCs and baseband processors. |
| Shutdown Current | <1 µA total (LDOs + LED drivers disabled) - extends standby battery life in always-on mobile peripherals. |
Pinout & Package
The MIC2845A-SCYMT-TR is housed in a 14-pin 2.5 mm × 2.5 mm Thin MLF® (MicroLeadFrame) leadless package with exposed thermal pad (EPAD), RoHS-compliant NiPdAu finish, and halogen-free mold compound. Thermal resistance θJA = 89°C/W enables reliable operation up to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 3.0–5.5 V battery or system rail; requires ≥1 µF ceramic bypass capacitor to suppress supply ripple and enable stable LDO/LED regulation. |
| LDO2 (Pin 2) | LDO2 output | Delivers regulated 1.0 V to low-voltage loads; must be decoupled with ≥1 µF ceramic capacitor placed adjacent to pin. |
| EN2 (Pin 3) | LDO2 enable | Active-high logic control; pulling low disables LDO2 and reduces quiescent current to <1 µA - critical for power-gating subsystems. |
| END (Pin 4) | LED driver enable/dimming input | Accepts PWM signal for brightness control; also serves as master enable - floating state causes undefined output behavior. |
| RSET (Pin 5) | Current reference setting | Connects to GND via resistor to set peak LED current (e.g., 20.5 kΩ → 20 mA at 100% duty cycle); defines all six channels' current simultaneously. |
| D1–D6 (Pins 6–8, 10–12) | LED cathode drivers | Sink current from LED anodes tied to VIN; each pin drives one WLED independently - unused pins left unconnected. |
| GND (Pin 9) | Power and signal ground | Common return path for LED drivers, LDOs, and control circuitry; must connect to EPAD and low-impedance PCB ground plane. |
| EN1 (Pin 13) | LDO1 enable | Active-high logic control for 3.3 V LDO; independent of EN2 - enables selective powering of analog/digital subsystems. |
| LDO1 (Pin 14) | LDO1 output | Delivers regulated 3.3 V; stable with ≥1 µF ceramic output capacitor - eliminates need for external feedback resistors. |
| EPAD | Thermal pad | Not internally connected; must be soldered to solid copper ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Average Matching™ (DAM™) | Real-time multiplexed current reference architecture delivering ±1.5% matching across full dimming range - eliminates visible banding in segmented LCDs. |
| Ultra Fast PWM™ interface | Supports 1% minimum duty cycle at 200 Hz and nonlinear but predictable response up to 500 kHz - enables flicker-free dimming while avoiding audible noise. |
| Dual independent LDOs | 3.3 V / 1.0 V outputs with separate enable pins allow staggered power sequencing and dynamic subsystem power gating without external logic. |
| Low-noise LDO operation | 200 µVRMS output noise (10 Hz–100 kHz) and 65 dB ripple rejection - suitable for powering noise-sensitive RF and audio circuits. |
| High-current parallel mode | All six D-pins can be shorted to deliver up to 6× single-channel current (e.g., 1.5 A with RSET = 1.65 kΩ) - supports camera flash without external MOSFETs. |
Applications
| Mobile Handset Keypad Backlighting | LCD Display Backlighting |
|---|---|
|
Use Scenario: Illuminating alphanumeric keypads in smartphones and feature phones under varying ambient light conditions. IC Role / Device Role / Timing Role: MIC2845A-SCYMT-TR acts as constant-current sink for 4–6 discrete WLEDs, with END pin driven by baseband processor's PWM timer. Use Value: ±1.5% matching ensures uniform key illumination; 40 mV dropout enables direct Li-ion drive - extending standby time by eliminating boost converter quiescent loss. |
Use Scenario: Driving edge-lit or direct-lit 6-LED backlight arrays in QVGA–WVGA LCD modules for handheld devices. IC Role / Device Role / Timing Role: MIC2845A-SCYMT-TR provides synchronized, matched current to all LEDs via single RSET and shared END PWM signal. Use Value: DAM™ matching prevents luminance gradients across display; Ultra Fast PWM™ supports >100 Hz refresh without visible flicker in video playback. |
| Camera Flash Driver | Portable Media Player Power Management |
|
Use Scenario: Delivering high-intensity, short-duration illumination for smartphone camera modules during still capture. IC Role / Device Role / Timing Role: MIC2845A-SCYMT-TR operates in parallel mode (D1–D6 shorted) to source up to 1.5 A peak current to a single high-brightness LED. Use Value: Sub-microsecond turn-on (2 µs) enables precise flash timing; 150 mV LDO dropout ensures stable 3.3 V bias for flash control ICs even during high-current pulses. |
Use Scenario: Powering dual-rail subsystems (e.g., 3.3 V audio codec + 1.0 V DSP core) in MP3 players and GPS navigation units. IC Role / Device Role / Timing Role: MIC2845A-SCYMT-TR supplies regulated 3.3 V and 1.0 V from shared battery input, with independent EN1/EN2 for dynamic rail control. Use Value: 35 µA LDO quiescent current minimizes battery drain during audio playback pause; 1 µF stability enables ultra-compact BOM with no external compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED driver + dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16832AATG+T | 4-channel WLED driver only; no integrated LDOs; requires external regulators for auxiliary rails. | Requires additional components for dual-rail power management - increases PCB area and BOM count. | Select when only LED driving is needed and system already provides dedicated 3.3 V/1.0 V supplies. |
| TPS61165DRVR | Inductive boost WLED driver (not linear); 1.8–6 V input; no LDOs; higher EMI and lower efficiency at high battery voltage. | Less suitable for noise-sensitive RF/audio sections; cannot drive LEDs directly from 4.2 V battery without regulation loss. | Select only if input voltage falls below 3.0 V (e.g., single-cell alkaline) and EMI constraints permit switching topology. |
Compared with MAX16832AATG+T and TPS61165DRVR, the MIC2845A-SCYMT-TR uniquely integrates matched linear WLED driving and dual precision LDOs in a single 2.5 mm × 2.5 mm package - reducing component count, eliminating boost EMI, and enabling true battery-direct operation with sub-1% brightness variation.
Availability
MIC2845A-SCYMT-TR is available at Aetrix Electronics and suitable for mobile handset backlighting, camera flash modules, and portable media player power management requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MIC2845A-SCYMT-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 fabless semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Known for high-efficiency LED drivers and low-noise LDOs.
The MIC2845A-SCYMT-TR belongs to Micrel's ultra-low-power WLED driver family, engineered specifically for battery-operated mobile devices where EMI-free operation, minimal board space, and precise LED current matching are mandatory design requirements.
FAQ
What is the exact LDO output voltage configuration of the MIC2845A-SCYMT-TR?
The MIC2845A-SCYMT-TR features two factory-set LDO outputs: LDO1 delivers 3.3 V ±3% and LDO2 delivers 1.0 V ±3%, both over –40°C to +125°C junction temperature. These voltages are fixed per ordering code SCYMT and cannot be adjusted externally - unlike variants such as MIC2845A-MFYMT (2.8 V / 1.5 V) or MIC2845A-PPYMT (3.0 V / 3.0 V). The MIC2845A-SCYMT-TR uses internal feedback networks to maintain accuracy without external resistors.
Can the MIC2845A-SCYMT-TR drive more than six LEDs?
Yes - the MIC2845A-SCYMT-TR supports parallel operation: connecting D1 through D6 together enables single-LED high-current drive up to 6× the per-channel current (e.g., 1.5 A with RSET = 1.65 kΩ). This mode is explicitly validated in the datasheet for camera flash applications. However, thermal limits must be observed: total power dissipation depends on (VIN − VLED) × ILED + LDO losses, and θJA = 89°C/W requires adequate PCB copper area under the EPAD.
What is the minimum PWM duty cycle supported by the MIC2845A-SCYMT-TR at 200 Hz?
The MIC2845A-SCYMT-TR supports a minimum PWM duty cycle of 1% at frequencies up to 20 kHz, as confirmed in Figure 3 of the datasheet. At 200 Hz, this corresponds to a 5 µs ON pulse width. Below 1%, the average LED current becomes non-linear and may fall outside guaranteed regulation - hence 1% is the validated lower limit for stable dimming performance in backlight applications.
How does the MIC2845A-SCYMT-TR achieve ±1.5% current matching across temperature?
The MIC2845A-SCYMT-TR achieves ±1.5% typical current matching using Dynamic Average Matching™ (DAM™), a proprietary architecture that multiplexes four precision current references across the six output channels in rotating sequence. This technique cancels process and temperature gradients across the die, ensuring matching remains within specification from –40°C to +125°C - not just at room temperature. The MIC2845A-SCYMT-TR's matching is measured and guaranteed across full operating range, not extrapolated.
Is the MIC2845A-SCYMT-TR compatible with 1 µF ceramic output capacitors on both LDOs?
Yes - the MIC2845A-SCYMT-TR is explicitly characterized and guaranteed stable with 1 µF X5R/X7R ceramic output capacitors on both LDO1 and LDO2, as stated in the "Features" and "LDO" sections of the datasheet. Larger values (e.g., 2.2 µF) further reduce output noise but are not required. Y5V or Z5U dielectrics are discouraged due to capacitance loss over temperature - the MIC2845A-SCYMT-TR's stability margin assumes ≥80% effective capacitance at operating conditions.
MIC2845A-SCYMT-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-SCYMT-TR FAQ
1.How can I place an order for MIC2845A-SCYMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2845A-SCYMT-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-SCYMT-TR reliable?
The price and inventory of MIC2845A-SCYMT-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-SCYMT-TR is usually 5 days.
3.What payment methods are accepted for MIC2845A-SCYMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2845A-SCYMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2845A-SCYMT-TR?
MIC2845A-SCYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2845A-SCYMT-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-SCYMT-TR?
For technical support, including MIC2845A-SCYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2845A-SCYMT-TR requirements.
6.How does Aetrix verify that MIC2845A-SCYMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC2845A-SCYMT-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-SCYMT-TR meets industry standards.
7.What is the process for return or replacement of MIC2845A-SCYMT-TR?
All MIC2845A-SCYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2845A-SCYMT-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-SCYMT-TR part is unused and in its original packaging.
Return procedure for MIC2845A-SCYMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC2845A-SCYMT-TR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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