A4407 Datasheet, PDF (8/29 Pages) Allegro MicroSystems – The A4407 is an automotive power management IC that uses a 2.2 MHz constant on-time (COT) buck pre-regulator to supply a 5 V linear regulator, a 5 V tracking/protected linear regulator,

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 < V_IN < 36 V, −40ºC < T_J < 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
V_REGUV(H) V_REG rising, NPOR transitions high
V_REGUV(L) V_REG falling, NPOR transitions low
V_REGUVHYS
V_3V3UV(H) V_3V3 rising, NPOR transitions high
V_3V3UV(L) V_3V3 falling, NPOR transitions low
V_3V3UVHYS
V_1V2UV(H)
Measured as percentage of err_1V2 ;
V_1V2 rising, NPOR transitions high
V_1V2UV(L)
Measured as percentage of err_1V2 ;
V_1V2 falling, NPOR transitions low
V_1V2UVHYS
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
V_ISEN(th) V_ISEN+ – V_ISEN–
I_LIM(VALLEY) R_SENSE = 300 mΩ, V_IN > V_INSW(L)
I_LIM(PEAK)
265
350
435
mV
883
1167
1450
mA
3.0
5.5
–
A
3V3 Overcurrent Threshold
V_CL3V3
3V3 Current Limit
I_3V3LIM
3V3 Foldback Threshold
I_3V3FB
1.2 V/1.5 V/1.8 V Overcurrent Protection
V_REG – V_CL3V3
R_CL3V3 = 300 mΩ
V_3V3 = 0 V, V_REG – V_CL3V3
210
235
280
mV
700
783
–
mA
48
65
90
mV
1V2 Overcurrent Threshold
1V2 Current Limit
1V2 Foldback Threshold
5VP Overcurrent Protection
V_CL1V2
I_1V2LIM
I_1V2FB
V_1V2 = 1.2 V, V_3V3 – V_CL1V2
R_CL1V2 = 390 mΩ
V_1V2 = 0 V, V_3V3 – V_CL1V2
179
218
245
mV
459
559
–
mA
45
60
84
mV
V5P Current Limit¹
V5P Foldback Current¹
5V Overcurrent Protection
I_V5PLIM
I_V5PFB
V_V5P = 5 V
V_V5P = 0 V
−280
−415
–
mA
−70
−110
−150
mA
V5 Current Limit¹
V5 Foldback Current¹
Thermal Protection
I_V5LIM
I_V5FB
V_V5 = 5 V
V_V5 = 0 V
−215
−310
–
mA
−74
−92
−135
mA
Thermal Shutdown Threshold
T_JTSD T_J rising
155
170
–
ºC
Thermal Shutdown Hysteresis
T_JTSDHYS
–
20
–
ºC
1_{For 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).
2_{Ensured 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