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LT8640 Datasheet(PDF) 32 Page - Analog Devices

Part # LT8640
Description  42V, 10A/12A Peak Synchronous Step-Down Silent Switcher
PDF  35 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT8640 Datasheet(HTML) 32 Page - Analog Devices

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Data Sheet
LT8638-2
analog.com
Rev.0
32 of 35
PACKAGE DESCRIPTION
Figure 60. Outline Dimensions
RELATED PARTS
PART
DESCRIPTION
COMMENTS
LT8638S
42V, 10A/12A Synchronous Step-
Down Silent Switcher 2
VIN = 2.8V to 42V, VOUT(MIN) = 0.6V, IQ =
100µA, ISD = 6µA,
5mm × 4mm LQFN-28
LT8648S
42V, 15A Synchronous Step-Down
Silent Switcher 2
VIN = 3V to 42V, VOUT(MIN) = 0.6V, IQ =
100µA, ISD = 6µA,
7mm × 4mm LQFN-36
LT8636
42V, 5A Synchronous Step-Down
Silent Switcher with IQ = 2.5µA
VIN = 3.4V to 42V, VOUT(MIN) = 0.97V, IQ
= 2.5µA, ISD < 1µA,
4mm × 3mm LQFN-20
LT8640S/
LT8643S
42V, 6A Synchronous Step-Down
Silent Switcher 2 with IQ = 2.5µA
VIN = 3.4V to 42V, VOUT(MIN) = 0.97V,
PACKAGE TOP VIEW
5
PIN 1
CORNER
Y
X
PACKAGE BOTTOM VIEW
4
6
SEE NOTES
E
D
b
0.375
e
e
b
0.30
0.30
0.20
0.20
E1
1.70
D1
1.20
LQFN 28 0818 REV Ø
TR AY PIN 1
BEVE L
PACKAGE IN TRAY LOADING ORIENTATION
COMPONENT
PIN 1
DE TAI L B
SUBSTR ATE
MOLD
CA P
H2
H1
DE TAI L A
DE TAI L C
SUGGESTED PCB LAYOUT
TOP VIEW
0.0000
0.2500
0.2500
0.7500
0.7500
1.2500
1.2500
1.7500
1.7500
7
PIN 1 NOTCH
0.30 × 45°
23
28
14
9
1
8
22
15
0.20
0.20
1.70
1.20
0.25 ±0.05
0.70 ±0.05
5.50 ±0.05
4.50 ±0.05
28b
e
MIN
0.85
0.01
0.30
0.22
A1
DE TAIL C
DE TAI L A
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. PRIMA RY DATUM -Z- IS SE ATING PLANE
METAL FEATURES UNDER THE SOLDER MASK OPENING NOT SHOWN
SO AS NOT TO OBSCURE THESE TERMINALS AND HEAT FEATURES
5
4
DETAILS OF PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE
LOCATED WITHIN THE ZONE INDIC ATED. THE PIN 1 IDENTIFIER
MAY BE EITHER A MOLD OR MARKED FE ATURE
6
THE EXPOSED HE AT FE ATURE IS SEGMENTED AND ARRANGED
IN A MATRIX FORM AT. IT MAY HAVE OPTIONA L CORNER RADII
ON EACH SEGMENT
7
CORNER SUPPORT PAD CHAMFER IS OPTIONA L
L
e/2
PACKAGE
OUTLINE
0.375
0.375
SYMBO L
A
A1
L
b
D
E
D1
E1
e
H1
H2
aaa
bbb
ccc
ddd
eee
fff
NOM
0.94
0.02
0.40
0.25
4.00
5.00
2.60
3.60
0.50
0.24 REF
0.70 REF
MAX
1.03
0.03
0.50
0.28
0.10
0.10
0.10
0.10
0.15
0.08
NOTES
SUBSTR ATE THK
MOLD CA P HT
DIMENSIONS
DE TAI L B
A
2×
aaa Z
M
X Y
Z
eee
M Z
fff
M
X Y
Z
ccc



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