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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
ELECTRICAL CHARACTERISTICS (continued) Valid at 5.5 V < VIN < 36 V, −40ºC < TJ < 150ºC; unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
NPOR Thresholds
VREG UVLO Thresholds
VREG UVLO Hysteresis
3V3 UVLO Thresholds
3V3 UVLO Hysteresis
1V2 UVLO Thresholds
1V2 UVLO Hysteresis
Buck (VREG) Current Protection
VREGUV(H) VREG rising, NPOR transitions high
VREGUV(L) VREG falling, NPOR transitions low
VREGUVHYS
V3V3UV(H) V3V3 rising, NPOR transitions high
V3V3UV(L) V3V3 falling, NPOR transitions low
V3V3UVHYS
V1V2UV(H)
Measured as percentage of err1V2 ;
V1V2 rising, NPOR transitions high
V1V2UV(L)
Measured as percentage of err1V2 ;
V1V2 falling, NPOR transitions low
V1V2UVHYS
4.80
5.00
5.20
V
4.75
4.94
5.14
V
–
60
–
mV
2.80
2.95
3.10
V
–
2.83
–
V
–
125
–
mV
85
89
93
%
–
84
–
%
–
5
–
%
VREG ISEN Voltage Threshold
VREG Valley Current Limit
VREG Peak Current Limit
3.3 V Overcurrent Protection
VISEN(th) VISEN+ – VISEN–
ILIM(VALLEY) RSENSE = 300 mΩ, VIN > VINSW(L)
ILIM(PEAK)
265
350
435
mV
883
1167
1450
mA
3.0
5.5
–
A
3V3 Overcurrent Threshold
VCL3V3
3V3 Current Limit
I3V3LIM
3V3 Foldback Threshold
I3V3FB
1.2 V/1.5 V/1.8 V Overcurrent Protection
VREG – VCL3V3
RCL3V3 = 300 mΩ
V3V3 = 0 V, VREG – VCL3V3
210
235
280
mV
700
783
–
mA
48
65
90
mV
1V2 Overcurrent Threshold
1V2 Current Limit
1V2 Foldback Threshold
5VP Overcurrent Protection
VCL1V2
I1V2LIM
I1V2FB
V1V2 = 1.2 V, V3V3 – VCL1V2
RCL1V2 = 390 mΩ
V1V2 = 0 V, V3V3 – VCL1V2
179
218
245
mV
459
559
–
mA
45
60
84
mV
V5P Current Limit1
V5P Foldback Current1
5V Overcurrent Protection
IV5PLIM
IV5PFB
VV5P = 5 V
VV5P = 0 V
−280
−415
–
mA
−70
−110
−150
mA
V5 Current Limit1
V5 Foldback Current1
Thermal Protection
IV5LIM
IV5FB
VV5 = 5 V
VV5 = 0 V
−215
−310
–
mA
−74
−92
−135
mA
Thermal Shutdown Threshold
TJTSD TJ rising
155
170
–
ºC
Thermal Shutdown Hysteresis
TJTSDHYS
–
20
–
ºC
1For input and output current specifications, negative current is defined as coming out of the node or pin (sourcing), positive current is defined as
going into the node or pin (sinking).
2Ensured by design and characterization, not production tested.
3–20°C ensured by design and characterization, not production tested.
Allegro MicroSystems, Inc.
8
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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