MT3608

Step-Up Converter

The MT3608 is a step-up converter from Aerosemi. View the full MT3608 datasheet below including electrical characteristics, absolute maximum ratings.

Manufacturer

Aerosemi

Overview

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

Applications

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

Pin Configuration

Pin Name	Pin Number	Description
SW	1	Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW. SW can swing between GND and 28V.
GND	2	Ground Pin
FB	3	Feedback Input. The FB voltage is 0.6V. Connect a resistor divider to FB.
EN	4	Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns it off. When not used, connect EN to the input supply for automatic startup.
VIN	5	Input Supply Pin. Must be locally bypassed.
NC	6	No Connect

.-40°C to 85°C

Electrical Characteristics

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

PARAMETER	CONDITIONS	MIN	TYP	MAX	UNIT
Operating Input Voltage		2		24	V
Under Voltage Lockout				1.98	V
Under Voltage Lockout Hysteresis			100		mV
Current (Shutdown)	V EN =0V		0.1	1	μ A
Quiescent Current (PFM)	V FB =0.7V ˈ No switch		100	200	μ A
Quiescent Current (PWM)	V FB =0.5V ˈ switch		1.6	2.2	mA
Switching Frequency			1.2		MHz
Maximum Duty Cycle	V FB =0V	90			%
EN Input High Voltage		1.5			V
EN Input Low Voltage				0.4	V
FB Voltage		0.588	0.6	0.612	V
FB Input Bias Current	V FB =0.6V	-50	-10		nA
SW On Resistance			80	150	m Ω
SW Current Limit	V IN =5V, Duty cycle=50%		4		A
SW Leakage	V SW =20V			1	μ A
Thermal Shutdown			155		ć

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.

Absolute Maximum Ratings

VIN,EN voltages …………………… -0.3V to 26V	Junction Temperature(Note2) ……… ..........160°C
FB Voltages ……………… ................-0.3V to 6V	Operating Temperature Range…… .-40°C to 85°C
SW Voltage ……………………… ...-0.3V to 30V	Lead T emperature(Soldering,10s)……… ...300°C
Power Dissipation ……………………… ...0.6W	Storage Temperature Range …… ..-65°C to 150°C
Thermal Resistance θ JC ……………… ..130°C/W	ESD HBM(Human Body Mode) …………… ...2kV
Thermal Resistance θ JA ……………… ..250°C/W	ESD MM(Machine Mode) ………………… .200V

Typical Application

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(%)

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