MP2358 查看數據表（PDF） - Monolithic Power Systems
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MP2358 Datasheet PDF : 9 Pages
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TM
MP2358 – 2A, 23V, 370KHz STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Maximum Duty Cycle
Minimum On Time
EN Shutdown Threshold
Enable Pull Up Current
EN UVLO Threshold Rising
EN UVLO Threshold Hysteresis
DMAX
tON
VFB = 0.8V
ICC > 100µA
VEN = 0V
VEN Rising
Supply Current (Shutdown)
Supply Current (Quiescent)
Thermal Shutdown
VEN ≤ 0.4V
VEN ≥ 3V
Note:
4) Slope compensation changes current limit above 40% duty cycle.
Min
Typ
Max Units
90
%
100
ns
0.7
1.0
1.3
V
1.0
µA
2.37 2.50 2.62
V
210
mV
23
36
µA
1.1
1.3
mA
160
°C
PIN FUNCTIONS
QFN10 SOIC8
Pin # Pin # Name Description
1
NC No Connect.
2
1
BS Bootstrap. This capacitor (C5) is needed to drive the power switch’s gate above the
supply voltage. It is connected between the 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
2
IN Supply Voltage. The MP2358 operates from a +4.75V to +23V unregulated input. C1
is needed to prevent large voltage spikes from appearing at the input.
5
3
SW Switch. This connects the inductor to either IN through M1 or to GND through M2.
6
4
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
5
FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin,
sets the output voltage. To prevent current limit runaway during a short circuit fault
condition the frequency foldback comparator lowers the oscillator frequency when the
FB voltage is below 400mV.
8
6 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
7
EN Enable/UVLO. A voltage greater than 2.62V enables operation. Leave EN
unconnected if unused. 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 the EN pin voltage needs to be less than 700mV.
10
8
SS Soft-Start. Connect SS to an external capacitor to program the soft-start. If unused,
leave it open.
MP2358 Rev. 1.3
www.MonolithicPower.com
3
3/23/2006
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© 2006 MPS. All Rights Reserved.
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