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PDF A8698 Data sheet ( Hoja de datos )
| Número de pieza | A8698 | |
| Descripción | Wide Input Voltage 3.0 A Step Down Regulator | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A8698
Wide Input Voltage 3.0 A Step Down Regulator
Features and Benefits
▪ 8 to 25 V input range
▪ Integrated DMOS switch
▪ Adjustable fixed off-time
▪ Highly efficient
▪ Adjustable 0.8 to 20 V output
Package: 8-Lead SOIC with exposed
thermal pad (suffix LJ)
Description
The A8698 is a constant off-time current mode step-down
regulator with a wide input voltage range. Regulation voltage is
set by external resistors, to output voltages as low as 0.8 V.
The A8698 includes an integrated power DMOS switch to
reduce the total solution footprint. It also features internal
compensation, allowing users to design stable regulators with
minimal design efforts.
The off-time can be set with an external resistor, allowing
flexibility in inductor selection. Additionally, the A8698 has
a logic level enable pin which can shut the device down and
put it into a low quiescent current mode for power sensitive
applications.
The A8698 is supplied in a low-profile 8-lead SOIC with
exposed pad (package LJ). Applications include:
▪ Applications with 8 to 25 V input
▪ Consumer electronics, networking equipment
▪ 12 V lighter-powered applications (portable DVD, etc.)
▪ Point of Sale (POS) applications
Approximate Scale 1:1
Typical Application
CBOOT
0.01 μF
BOOT
VIN
RTSET
30.1 k7
ENB
A8698
LX
TSET
VBIAS
GND FB
D1
+8 to 24 V
CIN3 CIN2 CIN1
82 μF 82 μF 0.22 μF
35 V 35 V
L1
33 μH
R1
6.34 k7
R2
2 k7
VOUT
3.3 V / 3 A
COUT
330 μF
6.3 V
ESR
Circuit for 12 V step down to 3.3 V at 3 A.
A8698-DS, Rev. 3
92
90
88
86
84
82
80
78
76
74
72
70
0
Efficiency
VIN = 12.0 V
VOUT = 5.0 V
VOUT = 3.3 V
VOUT = 2.5 V
0.5 1.0 1.5 2.0 2.5
Load Current (A)
Efficiency curves for circuit at left.
3.0
1 page  
A8698
Wide Input Voltage 3.0 A Step Down Regulator
Start-up
Performance Characteristics
Operation
VOUT; 2.00 V/div.
IOUT; 1.00 A/div.
t t = 10.0 ms/div.
VSW; 10.0 V/div.
VOUTAC; 500 mV/div.
VINAC; 1.00 V/div.
IOUT; 2.00 A/div.
t t = 5.00 μs/div.
Power Off
Transient Response
VIN = 12 V, VOUT = 3.3 V
VOUT; 2.00 V/div.
IOUT; 1.00 A/div.
t t = 1.00 ms/div.
Detail: Step Up Transient Response
VIN = 12 V, VOUT = 3.3 V
VOUTAC; 200 mV/div.
1.0 A
1.45 A
t
IOUT; 500 mA/div.
1.0 A
t = 1.00 ms/div.
Detail: Step Down Transient Response
VIN = 12 V, VOUT = 3.3 V
VOUTAC; 500 mV/div.
1.0 A
1.45 A
IOUT; 500 mA/div.
t t = 100 μs/div.
1.45 A
1.0 A
VOUTAC; 500 mV/div.
IOUT; 500 mA/div.
t t = 100 μs/div.
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
A8698
Wide Input Voltage 3.0 A Step Down Regulator
Evaluation Board Bill of Materials
Designator Quantity
Description
C1.1
1
Ceramic chip, 22 μF, 25 V, ±20%, X5R.
C1.2, C1.3
2
Aluminum electrolytic capacitor, 35 V / 82 μF, 930
mA ripple current
C2 1 Ceramic capacitor, X7R, ±10%, 0.1 μF / 50 V
C3 1 Ceramic capacitor, X7R, ±10%, 0.01 μF / 50 V
C4.2
0
Special polymer cap, 120 μF / 6.3 V, 15 mΩ
C4.1
C4.3
L1
0 Ceramic capacitor, X5R, ±20%, 47 μF / 6.3 V
1 Aluminum electrolytic capacitor, 6.3 V / 330 μF, 450
mA ripple current, 300 mΩ
1 Inductor, 33 μH, 53 mΩ, 3.9 A, ±20%
D1
R1
R2
R3
R4
R5
J1, J2, J3,
J4
P1
EN
U1
1
1
3
1
1
1
4
1
1
1
Schottky diode, 40 V / 3.0 A
Chip resistor, 6.34 kΩ, 1/16 W, 1%
Chip resistor, 2.0 kΩ,1/16 W, 1%
Chip resistor, 30.1 kΩ, 1/16 W, 1%
Chip resistor, 10 kΩ, 1/16 W, 1%
Chip resistor, 0 Ω, 1/16 W, 1%
Header, 2-pin, 100 mil spacing
Test point, Red, 1mm
Test point, Black, 1mm
Wide Input Voltage Step Down Regulator
Manufacturer
Panasonic
Rubycon
Murata
Kemet
Panasonic
Panasonic
Panasonic
Sumida
Diodes, Inc.
Std
Std
Std
Std
Std
Sullins
Farnell
Farnell
Allegro
Footprint
1210
8 mm × 12 mm
0603
0603
7.3 mm × 4.3 mm
× 3.1 mm
1210
8 mm × 10.2 mm
10.3 mm ×
10.5 mm × 4 mm
SMA
0603
0603
0603
0603
0603
0.100 in. × 2
0.038 in.
0.038 in.
ESOIC8
Part Number
ECJ4YB1E226M
35V-ZAV-820-8 X 12
GRM188R71H104KA93D
C0603C103K5RACTU
EEFUD0J121R
ECJ4YB0J476M
EEVFC0J331P
CDRH127/LDNP-330MC
B340
Std.
Std.
Std.
Std.
Std.
PTC36SAAN
240-345
240-333
A8698
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A8698.PDF ] | |
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