MP2361DQ データシートの表示（PDF） - Monolithic Power Systems

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MP2361DQ

2A, 23V, 1.4MHz Step-Down Converter

Monolithic Power Systems 

TM

MP2361 – 2A, 23V, 1.4MHz STEP-DOWN CONVERTER

ELECTRICAL CHARACTERISTICS (continued)

VIN = 12V, TA = +25°C, unless otherwise noted.

Parameter

Symbol Condition

Maximum Duty Cycle

DMAX VFB = 0.8V

Minimum On Time

tON

EN Shutdown Threshold Voltage

VEN ICC > 100µA

Enable Pull-Up Current

IEN VEN = 0V

EN UVLO Threshold Rising

VUVLO VEN Rising

EN UVLO Threshold Hysteresis

Supply Current (Shutdown)

IOFF VEN ≤ 0.4V

Supply Current (Quiescent)

ION VEN ≥ 3V

Thermal Shutdown

Note:

4) Equivalent output current = 1.5A ≥ 50% Duty Cycle

2.0A ≤ 50% Duty Cycle

Assumes ripple current = 30% of load current.

Slope compensation changes current limit above 40% duty cycle.

Min

Typ

Max Units

70

%

100

ns

0.7

1.0

1.3

V

1.0

µA

2.37 2.50 2.62

V

210

mV

20

36

µA

1.2

1.4

mA

160

°C

PIN FUNCTIONS

Pin # Name Description

1

NC No Connect.

2

BS Bootstrap (C5). This capacitor is needed to drive the power switch’s gate above the supply

voltage. It is connected between SW and BS pins to form a floating supply across the power

switch driver. The voltage across C5 is about 5V and is supplied by the internal +5V supply

when the SW pin voltage is low.

3

NC No Connect.

4

IN Supply Voltage. The MP2361 operates from a +4.75V to +23V unregulated input. C1 is needed

to prevent large voltage spikes from appearing at the input.

5

SW Switch. This connects the inductor to either IN through M1 or to GND through M2.

6

GND Ground. This pin is the voltage reference for the regulated output voltage. For this reason care

must be taken in its layout. This node should be placed outside of the D1 to C1 ground path to

prevent switching current spikes from inducing voltage noise into the part.

7

FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the

output voltage. To prevent current limit run away during a short circuit fault condition the

frequency foldback comparator lowers the oscillator frequency when the FB voltage is below

400mV.

8 COMP Compensation. This node is the output of the transconductance error amplifier and the input to the

current comparator. Frequency compensation is done at this node by connecting a series R-C to

ground. See the compensation section for exact details.

9

EN Enable/UVLO. A voltage greater than 2.62V enables operation. Leave EN unconnected for

automatic startup. An Under Voltage Lockout (UVLO) function can be implemented by the

addition of a resistor divider from VIN to GND. For complete low current shutdown it’s the EN

pin voltage needs to be less than 700mV.

10

SS Soft-Start Pin. Connect SS to an external capacitor to program the soft-start. If unused, leave it

open.

MP2361 Rev. 1.2

www.MonolithicPower.com

3

1/11/2006

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© 2006 MPS. All Rights Reserved.

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