A4407 데이터 시트보기 (PDF) - Allegro MicroSystems
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A4407
Allegro MicroSystems
A4407 Datasheet PDF : 29 Pages
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A4407
2.2 MHz Constant On-Time Buck Regulator
With Two External and Two Internal Linear Regulators
5 V Regulator (V5)
The 5V linear regulator is provided to supply local circuitry. This
regulator can deliver 310 mA typical, 215 mA minimum. When
a direct short is applied to this regulator, the output current folds
back to 0 V at approximately 92 mA typical (figure 4).
5 V Protected Tracking Regulator (V5P)
The 5VP linear tracking regulator is provided to supply remote
circuitry such as off-board sensors. The output is monitored and
in case of a short to battery condition the output is disabled and
protected until the short is removed. The regulator can deliver
415 mA typical, 280 mA minimum. When a direct short is
applied to this regulator, the output the current folds back to 0 V
at approximately 110 mA typical (figure 5).
The V5P regulator is designed to track the either the 3V3 output
or the V5 output. The V5P master reference is set by the status of
the TRACK pin. The V5P regulator will track the 3.3V output to
within ±0.5% and the V5 output to within ±25 mV under normal
steady state operating conditions. If the master reference (either
3V3 or V5) is decreasing, the V5P regulator will accurately
track the master reference down to the point at which the master
reference crosses its undervoltage threshold (either V3V3UV(L) or
V1V2UV(L) in the Electrical Characteristic tables).
6
5
4
3
Typical
2
1
0
50 75 100 125 150 175 200 225 250 275 300 325 350 375 400
Output Current (mA)
Figure 4. Fold back current limiting of the 5 V regulator
6
5
4
3
2
Typical
1
0
50 100 150 200 250 300 350 400 450 500
Output Current (mA)
Figure 5. Fold back current limiting of the 5VP regulator
Allegro MicroSystems, Inc.
14
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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