Microchip Technology MIC2295BD5-TR

Overview

MIC2295BD5-TR from Micrel is a high-power-density 1.2 MHz PWM boost regulator with an integrated 34 V / 1.2 A bipolar switch, designed for space-constrained DC-DC conversion in portable electronics. It operates from 2.5 V to 10 V input, delivers adjustable output up to 34 V, and achieves stable regulation using internal compensation and ceramic capacitors - enabling compact 5V/500mA or 15V/100mA supplies from single-cell Li-ion sources.

For engineers reviewing the MIC2295BD5-TR datasheet, MIC2295BD5-TR pinout, MIC2295BD5-TR application, or MIC2295BD5-TR equivalent, key selection criteria include its Thin SOT23-5 package footprint, 1.2A switch current limit, 1.24 V feedback reference, <1 µA shutdown current, and absence of OVP functionality compared to the MLF variant.

Technical Context

The MIC2295BD5-TR implements constant-frequency current-mode PWM control with a 1.2 MHz oscillator, slope-compensated ramp generator, and gm error amplifier. Its internal bipolar transistor switch enables high peak-current capability without external drivers, while internal compensation eliminates need for external loop components.

It uses a fixed 5-pin Thin SOT23-5 configuration with dedicated EN, FB, SW, VIN, and GND terminals - no OVP or AGND/PGND separation. The device supports duty cycles up to 85% and features under-voltage lockout (2.1 V typ), thermal shutdown (150°C), and ±1% feedback voltage accuracy over temperature.

Key Specifications

Pinout & Package

Package: Thin SOT23-5 - low-profile, surface-mount, thermally enhanced plastic package with exposed pad not present (unlike MLF variant); compatible with standard SOT23 reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost regulator applications.

Compared with MP1542DK-LF-Z and TPS61040DRVR, the MIC2295BD5-TR offers superior power density per mm² due to its 1.2 A bipolar switch and internal compensation, making it optimal for space-constrained 300–500 mA boost designs where simplicity and thermal robustness are critical.

Availability

MIC2295BD5-TR is available at Aetrix Electronics and suitable for organic EL power supplies, TFT-LCD bias generation, flash LED drivers, and DSL 12 V supply applications requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.

Supply support for MIC2295BD5-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 power IC manufacturer acquired by Microchip Technology in 2015; known for high-reliability DC-DC regulators, LDOs, and timing solutions.

The MIC2295 product line was engineered for high-efficiency, space-constrained boost conversion in portable and display electronics - emphasizing integration, thermal resilience, and ease of use in single-cell battery systems.

FAQ

What is the maximum output voltage achievable with the MIC2295BD5-TR?

The MIC2295BD5-TR supports adjustable output voltage up to 34 V, set by the external feedback resistor divider (VOUT = 1.24 V × (1 + R1/R2)). This limit is enforced by internal switch voltage rating and maximum duty cycle (85%), not by on-chip OVP - unlike the MIC2295BML variant. For reliable operation, output should remain ≤34 V with appropriate external clamping if fault conditions are possible.

Does the MIC2295BD5-TR include output over-voltage protection?

No, the MIC2295BD5-TR does not include output over-voltage protection. OVP is exclusive to the MIC2295BML (2 mm × 2 mm MLF-8L) variant, which features a dedicated OVP pin. The MIC2295BD5-TR uses a 5-pin Thin SOT23-5 package with no OVP pin or internal clamping circuitry - external zener or TVS protection is recommended if open-feedback fault scenarios exist.

What inductor value is recommended for the MIC2295BD5-TR in a 5 V output application?

A 4.7 µH to 10 µH shielded power inductor rated for ≥1.2 A saturation current is recommended for 5 V output applications. The datasheet shows validated designs using 4.7 µH (e.g., Sumida CL5DS or Murata LQH32CN series) with 5 V/400 mA output. Lower values reduce size but increase ripple; higher values improve stability at light loads but raise DCR losses - 10 µH is optimal for 3.3 V → 5 V conversion at 500 mA.

Can the MIC2295BD5-TR operate from a 2.5 V input to generate 15 V output?

Yes, the MIC2295BD5-TR supports 2.5 V input and can generate 15 V output, as confirmed in the Typical Characteristics section (Figure 5: "MIC2295 –5V Output" and efficiency curves). At VIN = 2.5 V and VOUT = 15 V, duty cycle is ~83%, within the 85% maximum limit. Efficiency reaches ~75% at 50 mA load, dropping to ~65% at 200 mA - requiring careful thermal design and low-DCR inductor selection.

What is the thermal performance difference between MIC2295BD5-TR and MIC2295BML?

The MIC2295BD5-TR (Thin SOT23-5) has θJA = 256°C/W, while the MIC2295BML (2 mm × 2 mm MLF-8L) has θJA = 93°C/W - a 2.7× improvement. This means the MLF package dissipates heat far more effectively, allowing higher continuous output current (e.g., 15 V/100 mA) without thermal shutdown. The BD5 variant requires conservative derating above 60°C ambient or >100 mA load unless board-level copper pours are added.