Mp1583 (U174); General Description; Features; Pinning - Sharp LC-19LE510E Service Manual

LC-19LE510
LC-22LE510
LC-24LE510
20.

MP1583 (U174)

19.
20. MP1583 (U174)
19.1
20.1.
The MP1583 is a step-down regulator with a built-in internal Power MOSFET. It achieves 3A of continuous
20.1.

General Description

output current over a wide input supply range with excellent load and line regulation. Current mode
The MP1583 is a step-down regulator with a built-in internal Power MOSFET. It achieves 3A of continuous operation provides fast transient response and eases loop stabilization. Fault condition protection
output current over a wide input supply range with excellent load and line regulation. Current mode includes cycle-by-cycle current limiting and thermal shutdown. An adjustable soft-start reduces the
operation provides fast transient response and eases loop stabilization. Fault condition protection stress on the input source at start-up. The MP1583 requires a minimum number of external components,
includes cycle-by-cycle current limiting and thermal shutdown. An adjustable soft-start reduces the providing a compact solution.
stress on the input source at start-up. The MP1583 requires a minimum number of external components,
19.2 20.2.
providing a compact solution.

20.2.

Features


 
3A Output Current
 
Programmable Soft-Start
 
100mΩ Internal Power MOSFET Switch
 
Stable with Low ESR Output Ceramic Capacitors
 
Up to 95% Efficiency
 
20μA Shutdown Mode


Fixed 385KHz Frequency


Thermal Shutdown


Cycle-by-Cycle Over Current Protection


Wide 4.75V to 23V Operating Input Range

Output Adjustable from 1.22V to 21V
19.3 20.3.

Under-Voltage Lockout
20.3.

Pinning

Pin
No.
Pin
1 BOOT
No.
1 BOOT
2
3
2
3
4
5
4
5
6
7
8
General Description
Features
3A Output Current
Programmable Soft-Start
100mΩ Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic Capacitors
Up to 95% Efficiency
20μA Shutdown Mode
Fixed 385KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75V to 23V Operating Input Range
Output Adjustable from 1.22V to 21V
Under-Voltage Lockout
Pinning
Pin Description
Name
Pin Description
High-Side Gate Drive Bootstrap Input. BS supplies the drive for the
Name
high-side N-Channel MOSFET switch.
High-Side Gate Drive Bootstrap Input. BS supplies the drive for the
IN Power Input. Drive IN with a 4.75V to 23V power source.
high-side N-Channel MOSFET switch.
SW Power Switching Out is the switching node that supplies power to the
IN Power Input. Drive IN with a 4.75V to 23V power source.
output
SW Power Switching Out is the switching node that supplies power to the
GND Ground.
output
FB Feedback Input. FB senses the output voltage and regulates it. Drive
GND Ground.
FB with a resistive voltage divider from the output voltage. FB
threshold is 1.222V.
FB Feedback Input. FB senses the output voltage and regulates it. Drive
FB with a resistive voltage divider from the output voltage. FB
COMP Compensation Node is used to compensate the regulation control
loop.
EN Enable/UVLO. A voltage greater than 2.71V enables operation. For
complete low current shutdown the EN pin voltage needs to be at less
than 900mV. When the voltage on EN exceeds 1.2V, the internal
regulator will be enabled and the soft-start capacitor will begin to
charge. The MP1583 will start switching after the EN pin voltage
reaches 2.71V.
SS Soft-Start Control Input. SS controls the soft-start period.
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