MP1482互换的DC-DC同步降压稳压器MXT2482

DESCRIPTION

The MXT2482SX is a monolithic synchronous buck regulator. The device integrates 150mΩMOSFETS that provide 2A continuous load current over a wide operating input voltage of 4.5 to 23V. Current mode control provides fast transient response and cycle-by-cycle current limit.

An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops below 1µA.

This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components.

PACKAGE REFERENCE FEATURES

. • 2-2.5A Output Current

. • Wide 4.5-23V Operating Input Range

. • Integrated 150mΩ Power MOSFET Switches

. • Output Adjustable from from 0.925 to 20V

. • Up to 95% Efficiency

. • Programmable Soft-Start

. • Stable with Low ESR Ceramic Output Capacitors

. • Fixed 450KHz Frequency

. • Cycle-by-Cycle Over Current Protection

. • Input Under Voltage Lockout

. • Thermally Enhanced 8-Pin SOIC/SOIC-E Package

APPLICATIONS

. • Distributed Power Systems

. • Networking Systems

. • FPGA, DSP, ASIC Power Supplies

. • Green Electronics/ Appliances

. • Notebook Computers

ABSOLUTE MAXIMUM RATINGS

(1)

Supply Voltage (V IN ).......................-0.3V to 26V

Switch Voltage (V SW )............. –1V to V IN + 0.3V Bootstrap Voltage (V BS ) ...Vsw-0.3V to V SW

+ 6V Enable/UVLO Voltage (V EN )...........–0.3V to +6V

Comp Voltage (V COMP ) ...................–0.3V to +6V

Feedback Voltage (V FB ) ................–0.3V to +6V

Junction Temperature ........................... +150°C Lead Temperature ................................. +260°C

Storage Temperature.............. –55°C to +150°C

Recommended Operating Conditions

(2)

Input Voltage (V IN ) ......................... 4.5V to 23V Output Voltage (V SW ) ....................... 0.925 to 20V

Operating Temperature...............–20°C to +85°C

Thermal Resistance (3)

θJA θJC

SOIC8N (4)

.............................. 50...... 10... °C/W

Notes:

1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its

operating conditions. 3) Measured on approximately 1” square of 1 oz copper. 4) Measured only with solder exposed pad to

board

MXT2482SX MXT2482SX MXT2482SX

MXT2482SX

MXT2482SX MXT2482SX MXT2482SX

MXT2482SX

MXT2482SXA

ELECTRICAL CHARACTERISTICS

V IN = 12V, T A = +25°C, unless otherwise noted.

Parameter Condition Min Typ Max Units Shutdown Supply Current V EN ≤ 0.3V 0.3 3.0 µA Supply Current V EN ≥ 2.6V, V FB = 1.0V 1.3 1.5 mA Feedback Voltage 4.5V ≤ V IN ≤23V 900 925 950 mV Feedback Overvoltage Threshold 1.1 V Error Amplifier Voltage 480 V/V Error Amplifier Transconductance I C = 10µA 800 µA/V High-Side Switch-On Resistance 150(4) mΩLow-Side Switch-On Resistance 150(4) mΩHigh-Side Switch Leakage V EN = 0V, V SW = 0V 0.1 10 µA Upper Switch Current Limit 2.4 3.7 A Lower Switch Current Limit 0.9 A COMP to Current Sense

Transconductance 4.0 А/V Oscillator Frequency 400 450 500 KHz Short Circuit Frequency V FB = 0V 160 KHz Maximum Duty Cycle V FB = 0.8V 90 % Minimum On Time 120 nS EN Shutdown Threshold Voltage V EN Rising 1.1 1.5 2.0 V EN Shutdown Threshold Voltage

Hysterisis 140(4) mV EN Lockout Threshold Voltage 2.2 2.5 2.7 V EN Lockout Hysterisis 140(4) mV Input UVLO Threshold Rising V IN Rising 3.80 4.10 4.40 V Input UVLO Threshold Hysteresis 210 mV Soft-start Current V SS = 0V 6.0 µA Soft-start Period C SS = 0.1µF 15 ms Thermal Shutdown4 160 C

Note:

4) Guaranteed by design