Building Block Solutions (BBS) for Automotive Low Drop-Out (LDO) Linear Regulators Board — FAQ

The Building Block Solutions – Automotive Low Drop-Out (LDO) board is a modular demonstration platform designed to evaluate and demonstrate several of our LDO linear regulators. It consists of nine independent submodules, each using a different LDO so you can test, compare and integrate solutions into your designs.

The board is fully assembled and teste. For evaluation, you need an external laboratory power supply, a multimeter and an external load.

The board includes these submodules, with typical configuration shown in the user guide:

• BBS1 – MCP1722: Dual-output high-voltage LDO: 24V input, 50 mA output for both channels, 10V and 3.3V output voltages, low quiescent current, short-circuit current foldback protection, extended junction temperature range (-40°C to + 150°C), power-good monitoring for both outputs
• BBS2 – MAQ5283: High-voltage LDO: 100V input, 20 mA output, 3V output voltage, adjustable between 1.23V to 5.5V, low quiescent current, high Power-Supply Rejection Ratio (PSRR) (75 dB at 10 kHz)
• BBS3 – MCP178: High-voltage LDO: 48V input, 80 mA output, 5V output voltage, adjustable between 1.3V to 5V, low quiescent current, short-circuit current foldback protection, extended junction temperature range (-40°C to +150°C)
• BBS4 – MCP1826S: High-current LDO: 6V input, 1A output, 5V output voltage, stable with only a 1 μF ceramic capacitor
• BBS5 – MCP1825S: Low-voltage LDO: 5V input, 500 mA output, 1.8V output voltage, stable with only a 1 μF ceramic capacitor
• BBS6 – MAQ5300: Very low drop-out linear regulator: 5.5V input, 300 mA output, 3.3V output voltage, very low drop-out voltage (200 mV at full load)
• BBS7 – MCP1726: High-current LDO: 4.5V input, 1A output, 3.3V output voltage, adjustable between 0.8V to 5V, stable with only a 1 μF ceramic capacitor, power-good monitoring
• BBS8 – MIC5233: High-voltage LDO: 12V input, 50 mA output, 1.8V output voltage, reverse battery and reverse leakage protection
• BBS9 – MCP1793: High-voltage LDO: 24V input, 100 mA output, 5V output voltage, short-circuit current foldback protection, extended junction temperature range (-40°C to +150°C)

The Building Block Solutions – Automotive LDO regulators board supports use cases including:

• Rapid prototyping and evaluation of automotive LDO regulators.
• Educational tool for understanding low drop-out linear regulators
• Reference designs for integrating Microchip Technology Inc. automotive LDO regulators into custom designs

The Building Block Solutions – Automotive LDO (BB58Y01A) board accelerates prototyping by providing preconfigured LDO submodules that can be evaluated and compared without requiring board design or assembly.

Select the submodule that best matches your voltage, current and feature requirements:

• For low-voltage rails derived from automotive battery inputs (12V, 24V or 48V) use high-voltage options (BBS1/BBS2/BBS3/BBS8/BBS9).
• For higher current requirements, use high-current options (BBS4, BBS5 or BBS7).
• For low drop-out and improved efficiency at low headroom, use BBS6.

Use the following procedure:

• Connect the power supply to the input terminals of the selected submodule (see Figure 1‑1 in the user guide)
• Connect the load to VOUT (+) and GND (–)
• EN is pulled high by default through a resistor
• Turn on the supply and monitor VOUT with a voltmeter; the output should remain close to the nominal value over the operating range

The guide lists the nominal outputs:

• 1.8V (BBS5 and BBS8)
• 3V (BBS2) 
• 3.3V (BBS1, BBS6 and BBS7)
• 5V (BBS3,BBS4 and BBS9)
• 10V (BBS1)

From Table 1‑1 in the user’s guide:

• BBS1 (MCP1722): 11V–24V
• BBS2 (MAQ5283): 6V–100V
• BBS3 (MCP1781): 6V–48V
• BBS4 (MCP1826S): 5.5V–6V
• BBS5 (MCP1825S): 2.1V–5.5V
• BBS6 (MAQ5300): 3.5V–5.5V
• BBS7 (MCP1726): 3.8V–4.5V
• BBS8 (MIC5233): 3.5V–12V
• BBS9 (MCP1793): 6.2V–24V

Table 1‑1 from the user’s guide lists:

• BBS1: 50 mA for each output
• BBS2: 20 mA
• BBS3: 80 mA
• BBS4: 1A
• BBS5: 500A
• BBS6: 300 mA
• BBS7: 1A
• BBS8: 50 mA
• BBS9: 100 mA