A4411 Datasheet, PDF (5/45 Pages) Allegro MicroSystems – Automotive AEC-Q100 qualified

A4411
Adjustable Frequency Buck or Buck-Boost Pre-Regulator with a
Synchronous Buck, 3 LDOs, Pulse-Width Window Watchdog, NPOR, and POK5V
VBAT
Din
SS3P4
100 µF
50 V/250 mΩ
2×4.7 µF
50 V
1210
VIN
VIN
0.1 µF
0603
CP1
1.0 µF
CP2
0.22 µF
C_P1
39 pF
SYNC
(optional)
R_Z1
15 kΩ
C_Z1
4.7 nF
R_FSET
57.6 kΩ
COMP1
FET/SYNC
A4411
These components
required if V_VIN < 6.0 V
D3
BAS16J
D4
MSS1P5
CP3
0.1 µF
50 V
SLEW
LX1
LX1
LG
VREG
LX2
LX2
PGND
PGND
FB_ADJ
COMP2
R_SLEW
42.2 kΩ
L1 22 µH, 66 mΩ
IHLP2525CZER4R7M01
5×10 µF
10 V/X7R/1206
(~65 µF @ 5.3 V)
D1
SS3P4
2 kΩ
D2
Q1:
SS3P4
NVTFS4823N or
SQS420EN or
STL10N3LLH5
0.47 µF
L2 22 µH, 135 MΩ
IHLP1616BEZER2R2M11
2 × 22 µF
10 V/X7R/1206
(~36 µf @ 3.3 V)
RFB1
4.75 kΩ
±0.5%
3.3 V_OUT
800 mA_MAX
R_Z2
17.4 kΩ
C_Z2
3.3 nF
C_P2
39 pF
RFB2
1.52 kΩ
±0.5%
Functional Block Diagram Modifications for Buck-Boost Mode (f_OSC = 400 kHz)
A4411
These components
required if V_VIN < 6.0 V
D3
BAS16J
D4
MSS1P5
0.1 µF/50 V
C_P1
27 pF
R_Z1
13.3 kΩ
C_Z1
2.7 nF
COMP1
LX1
LX1
LG
VREG
L1 4.7 µH, 37 mΩ
IHLP2525CZER4R7M01
D1
SS2P4
5.35 V_TYP
3×10 µF
16 V/X7R/1206
(23 – 26 µF @ 5.3 V)
0.47 µF
Functional Block Diagram Modifications for Buck Only Mode, f_OSC = 2 MHz
Allegro MicroSystems, LLC
5
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com