MAX8640Z Maxim Integrated Products, MAX8640Z Datasheet - Page 7

• Manufacturer Part Number: MAX8640Z
• Description: 4MHz/2MHz Synchronous Step-Down DC-DC Converters
• Manufacturer: Maxim Integrated Products

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their small size and low ESR. Make sure the capacitor
maintains its capacitance over temperature and DC
bias. Capacitors with X5R or X7R temperature charac-
teristics typically perform well. The output capacitance
can be very low; see the Selector Guide for recom-
mended capacitance values. For optimum load-tran-
sient performance and very low output ripple, the output
capacitor value in µF should be equal to or larger than
the inductor value in µH.
MAX8640YEXT08
MAX8640ZEXT08
MAX8640YEXT10
MAX8640YEXT11
MAX8640YEXT12
MAX8640YEXT13
MAX8640YEXT15
MAX8640YEXT16
MAX8640YEXT18
MAX8640YEXT19
MAX8640YEXT24
MAX8640YEXT25
MAX8640YEXT82
MAX8640ZEXT11
MAX8640ZEXT12
MAX8640ZEXT13
MAX8640ZEXT15
MAX8640ZEXT18
MAX8640YELT08
MAX8640YELT11
MAX8640YELT12
MAX8640YELT13
MAX8640YELT15
MAX8640YELT16
MAX8640YELT18
MAX8640YELT19
MAX8640YELT25
MAX8640YELT82
MAX8640ZELT08
MAX8640ZELT11
PART
_______________________________________________________________________________________
Tiny 500mA, 4MHz/2MHz Synchronous
VOLTAGE (V)
OUTPUT
2.85
2.85
0.8
1.0
1.1
1.2
1.3
1.5
1.6
1.8
1.9
2.4
2.5
0.8
1.1
1.2
1.3
1.5
1.6
1.8
1.9
2.5
0.8
1.1
1.2
1.3
1.5
1.8
0.8
1.1
FREQUENCY
Step-Down DC-DC Converters
(MHz)
1.2
1.6
1.7
1.8
1.9
2.0
2.0
2.0
2.0
2.0
1.7
1.5
1.2
1.7
1.8
1.9
2.0
2.0
2.0
2.0
1.7
1.5
2.4
3.4
3.6
3.7
3.9
4.0
2.4
3.4
The input capacitor, C1, reduces the current peaks
drawn from the battery or input power source and
reduces switching noise in the IC. The impedance of C1
at the switching frequency should be kept very low.
Ceramic capacitors are recommended due to their
small size and low ESR. Make sure the capacitor main-
tains its capacitance over temperature and DC bias.
Capacitors with X5R or X7R temperature characteristics
RECOMMENDED COMPONENTS
L1 (µH)
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
1
1
1
1
1
1
1
1
C2 (µF)
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
4.7
2.2
2.2
2.2
2.2
2.2
4.7
2.2
10
10
Selector Guide
Input Capacitor
TOP MARK
ACQ
ACR
ACG
ADD
ADB
ACH
ADM
ACM
ACN
ACO
ACU
ADF
ACS
ACJ
ADJ
ACL
ACP
ACI
OW
NC
ND
NG
NH
NB
NE
NK
NF
NJ
NL
NI
7