MT3608

Part: MT3608 from Aerosemi

Type: Current Mode Step-Up Converter

Description: 2–24 V input, 4 A switch current limit step-up converter with integrated 80 mΩ power MOSFET, 1.2 MHz fixed switching frequency, and up to 93% efficiency, capable of up to 28 V output.

Operating Conditions:

• Supply voltage: 2–24 V
• Operating temperature: -40 to 85 °C
• Max output voltage: 28 V
• Switching frequency: 1.2 MHz

Absolute Maximum Ratings:

• Max supply voltage: 26 V
• Max continuous current: 4 A (internal switch current limit)
• Max junction/storage temperature: 160 °C (Junction Temperature)

Key Specs:

• Operating Input Voltage: 2 V to 24 V
• Switching Frequency: 1.2 MHz
• SW On Resistance: 80 mΩ (Typ)
• SW Current Limit: 4 A (Typ)
• FB Voltage: 0.588 V (Min), 0.6 V (Typ), 0.612 V (Max)
• Quiescent Current (PFM): 100 μA (Typ), 200 μA (Max)
• Shutdown Current: 0.1 μA (Typ), 1 μA (Max)
• Thermal Shutdown: 155 °C (Typ)

Features:

• Integrated 80mΩ Power MOSFET
• 1.2MHz Fixed Switching Frequency
• Internal 4A Switch Current Limit
• Adjustable Output Voltage (up to 28V)
• Internal Compensation
• Automatic Pulse Frequency Modulation Mode at Light Loads
• Up to 93% Efficiency
• Under-voltage lockout, current limiting, and thermal overload protection

Applications:

• Battery-Powered Equipment
• Set-Top Boxed
• LCD Bais Supply
• DSL and Cable Modems and Routers
• Networking cards powered from PCI or PCI express slots

Package:

• SOT23-6

• z Battery-Powered Equipment
• z Set-Top Boxed
• z LCD Bais Supply
• z DSL and Cable Modems and Routers
• z Networking cards powered from PCI or PCI express slots

.-40°C to 85°C

(V IN =VEN =5V,T A = 25°C, unless otherwise noted.)

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

Note 2: T J is calculated from the ambient temperature T A and power dissipation P D according to the following formula: T J = T A + (P D ) x (250°C/W).

Note 3: 100% production test at 25°C. Specifications over the temperature range are guaranteed by design and characterization.

Figure 1. Basic Application Circuit

The MT3608 is a constant frequency, 6-pin SOT23 current mode step-up converter intended for small, low power applications. The MT3608 switches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inrush current and extends battery life.

The MT3608 features automatic shifting to pulse frequency modulation mode at light loads. The MT3608 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The MT3608 is available in a small 6-pin SOT-23 package.

Efficiency(%)