Microchip Technology MIC2293-15BML-TR

Overview

MIC2293-15BML-TR from Microchip Technology is a high-frequency PWM boost regulator optimized for constant-current white LED driver applications, featuring 2.0 MHz switching frequency, 15 V output overvoltage protection (OVP), internal Schottky diode, and operation from 2.5 V to 10 V input. It delivers up to 34 V output voltage with 95 mV feedback reference and supports LED backlighting in compact portable electronics.

For engineers reviewing the MIC2293-15BML-TR datasheet, MIC2293-15BML-TR pinout, MIC2293-15BML-TR application, or MIC2293-15BML-TR equivalent, key selection criteria include OVP threshold accuracy, 2 mm × 2 mm DFN-8 thermal performance, shutdown current <1 µA, and compatibility with ceramic output capacitors in space-constrained LED driver designs.

Technical Context

The MIC2293-15BML-TR implements constant-frequency current-mode PWM control with a dedicated 2.0 MHz oscillator, slope compensation ramp generator, and gm error amplifier referenced to 95 mV. Its bipolar output switch supports 500 mA peak current and integrates a Schottky diode rated for 34 V reverse voltage and ≤1 V forward drop at 150 mA.

OVP is implemented via a dedicated monitor circuit tied to the OUT pin, clamping output at 13–16 V (typical 15 V) to protect LEDs and external components during open-circuit fault conditions. The device operates across –40°C to +125°C junction temperature and maintains <1% line/load regulation under specified conditions.

Key Specifications

Pinout & Package

Package: 2 mm × 2 mm, 0.9 mm height, 8-pin DFN (ML) with exposed thermal pad (EP). RoHS-compliant, matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC2293-15BML-TR, the MIC2293-34YML-TR offers extended OVP protection for higher-voltage LED strings but shares identical control architecture and pinout, while the TPS61310DRCR trades integrated Schottky and 95 mV FB simplicity for higher switching frequency and MOSFET efficiency-requiring redesign of feedback and output rectification.

Availability

MIC2293-15BML-TR is available at Aetrix Electronics and suitable for cell phone backlighting, GPS display illumination, and digital camera flash applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MIC2293-15BML-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

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog, interface, and power management ICs, with emphasis on embedded control and reliability-critical applications.

The MIC2292/93 product line was designed specifically for high-efficiency, space-constrained white LED backlighting in portable consumer electronics, integrating critical functions-including OVP, Schottky diode, and precision current sensing-into a 2 mm × 2 mm DFN package.

FAQ

What is the exact OVP threshold voltage for MIC2293-15BML-TR?

The MIC2293-15BML-TR features a factory-trimmed overvoltage protection threshold of 15 V nominal, with a guaranteed range of 13 V to 16 V across temperature and process variations. This OVP circuit actively clamps the OUT pin voltage during LED open-circuit faults to prevent damage to the internal switch and external components. The 15 V rating is fixed per device variant and cannot be adjusted externally.

Does MIC2293-15BML-TR require an external Schottky diode?

No, the MIC2293-15BML-TR integrates a Schottky diode rated for 34 V reverse voltage and ≤1 V forward drop at 150 mA, eliminating the need for an external diode. This integration reduces bill-of-materials count, PCB area, and thermal design complexity. The internal diode connects between the SW and OUT pins and is optimized for use with the device's 2.0 MHz switching frequency and bipolar output transistor.

How is LED current set on MIC2293-15BML-TR?

LED current is set by connecting a resistor (R_FB) between the FB pin and system ground. The device regulates the voltage at FB to 95 mV ±5 mV, so LED current equals 95 mV divided by R_FB (I_LED = 95 mV / R_FB). For example, a 4.75 Ω resistor sets 20 mA. This method provides accurate, temperature-stable current control independent of input voltage or LED forward voltage variation.

Can MIC2293-15BML-TR operate from a single 1.5 V alkaline cell?

No, MIC2293-15BML-TR requires a minimum input voltage of 2.5 V per its absolute operating specification. A single 1.5 V alkaline cell falls below this threshold and cannot power the device directly. It is designed for 1–2 cell Li-ion (3.0–8.4 V), or 3–4 cell NiMH/alkaline (3.6–6.0 V) configurations. A boost pre-regulator would be needed to use it with sub-2.5 V sources.

What thermal considerations apply to MIC2293-15BML-TR in continuous operation?

The MIC2293-15BML-TR has a junction-to-air thermal resistance (θ_JA) of 93°C/W in the standard 2 mm × 2 mm DFN-8 package. To maintain T_J ≤ +125°C, maximum power dissipation must be limited based on ambient temperature-for example, at 25°C ambient, average power should remain below ~1.07 W. Proper PCB layout with the exposed pad (EP) soldered to ≥1 cm² copper pour is essential to achieve rated thermal performance.