Даташит mt3608 pdf ( datasheet )

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AEROSEMI
FEATURES

• Integrated 80mΩ Power MOSFET

• 2V to 24V Input Voltage
• 1.2MHz Fixed Switching Frequency
• Internal 4A Switch Current Limit
• Adjustable Output Voltage
• Internal Compensation
• Up to 28V Output Voltage
• Automatic Pulse Frequency Modulation
Mode at Light Loads
• up to 97% Efficiency
• Available in a 6-Pin SOT23-6 Package
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
MT3608
High Efficiency 1.2MHz
2A Step Up Converter
GENERAL DESCRIPTION
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.
TYPICAL APPLICATION
Efficiency
Figure 1. Basic Application Circuit
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Iout (mA)
Figure 2. Efficiency Curve
1

MT3608
ABSOLUTE MAXIMUM RATINGS
IN, EN voltages ………..….…… -0.3V to 26V
Operating Temperature……. -40°C to +85°C
FB Voltages …………………………..-0.3V to 6V
Junction Temperature …………………160°C
SW Voltage ……………………..-0.3V to 30V
Storage Temperature Range -65°C to 150°C
Peak SW Sink and Source Current ………4A
Lead Temperature (Soldering, 10s) …+300°C
PACKAGE/ORDER INFORMATION

SW 1

6 NC

GND 2

5 IN

FB 3

PIN DESCRIPTION

SOSOTT2233—56

(M(MTT3365408))

4 EN

PIN NAME
FUNCTION
1
SW
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.
2 GND Ground Pin
3 FB Feedback Input. The FB voltage is 0.6V. Connect a resistor divider to FB.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a
4 EN low input turns it off. When not used, connect EN to the input supply for automatic
startup.

5 IN Input Supply Pin. Must be locally bypassed.

6 NC NC
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ELECTRICAL CHARACTERISTICS
MT3608

(VIN=VEN=5V, TA = 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)
Quiescent Current (PFM)
Quiescent Current (PWM)
Switching Frequency

VEN= 0V

VFB=0.7V，No switch

VFB=0.5V，switch

0.1 1 µA
100 200 µA
1.6 2.2 mA
1.2 MHz
Maximum Duty Cycle
EN Input High Voltage

VFB = 0V

90
1.5
%
V
EN Input Low Voltage
0.4 V
FB Voltage
0.588 0.6 0.612
V
FB Input Bias Current

VFB = 0.6V

-50 -10
nA
SW On Resistance (1)

80 150 mΩ

SW Current Limit (1)

VIN= 5V, Duty cycle=50%

4
A
SW Leakage

VSW = 20V

1 μA

Thermal Shutdown

155 ℃

Note:
1) Guaranteed by design, not tested.
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