FDD86102LZ
Onsemi
The n-Channel MOSFET FDD86102LZ with a drain-to-source voltage of 100V, drain current of 35A, and on-resistance of 22.5mΩ is chosen
Reference DesignAnalog
MAXREFDES1221: 10W Bootstrapped Boost Converter Reference Design
Reference design for a 10W boost converter using the MAX669 controller to step up 2.6V-4.5V battery inputs to 12V at 0.833A with over 90% efficiency.
Overview
The MAXREFDES1221 reference design features a 10W boost converter utilizing the MAX669 current-mode PWM DC-DC controller in bootstrapped mode. This configuration allows the circuit to continue regulating even at low input voltages, specifically targeting single-cell battery applications with an input range of 2.6V to 4.5V. The design outputs 12V at 0.833A with a 400kHz switching frequency and achieves efficiency levels over 90%. The document provides detailed technical guidance on the design process, including calculations for the 10µH inductor, current-sense resistor, and input/output capacitor selection to minimize voltage ripple.
Use Cases
- Single-cell battery-powered devices
- 12V DC power supply modules
- Portable electronics
- Low-input voltage boost applications
Topics
MAX669
MAXREFDES1221
Boost Converter
DC-DC Controller
Bootstrapped Mode
Single-cell battery
Step-up converter
Analog Devices
FDD86102LZ
VS-MBRS130L-M3
Referenced Parts
MAX669
Maxim Integrated
This reference design boosts a single-cell battery voltage to a 10W output using the MAX669 controller
VS-MBRS130L-M3
Vishay
The VS-MBRS130L-M3 with 30V reverse voltage and 1A forward current was chosen as the output diode
| FDD86102LZ | Onsemi | The n-Channel MOSFET FDD86102LZ with a drain-to-source voltage of 100V, drain current of 35A, and on-resistance of 22.5mΩ is chosen |
| MAX669 | Maxim Integrated | This reference design boosts a single-cell battery voltage to a 10W output using the MAX669 controller |
| VS-MBRS130L-M3 | Vishay | The VS-MBRS130L-M3 with 30V reverse voltage and 1A forward current was chosen as the output diode |