Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
MAX1636
Table 1. Component Selection for Standard Applications
COMPONENT
Input Voltage
Range
Output Voltage
Range
Application
Frequency
LOAD CURRENT
1A
7V to 22V
1.8V
CPU I/O
300kHz
4A
7V to 22V
1.8V
CPU Core
300kHz
7A (EV KIT)
7V to 22V
1.25V to 2V
CPU Core
300kHz
300kHz
International Rectifier
IRF7413,
Fairchild NDS8410A,
or Siliconix Si4410DY
300kHz
International Rectifier
IRF7413,
Fairchild NDS8410A,
or Siliconix Si4410DY
3A
4.75V to 30V
3.3V
3A
6V to 30V
5V
Q1 High-Side
MOSFET
1/2 Si4902DY or
1/2 MMDF3NO3HD
International Rectifier
International Rectifier
IRF7413,
IRF7403 or
Fairchild NDS8410A,
Siliconix Si9804DY
or Siliconix Si4410DY
Q2 Low-Side
MOSFET
1/2 Si4902DY or
1/2 MMDF3NO3HD
International Rectifier
IRF7413,
Fairchild FDS6680 or
Fairchild NDS8410A, Siliconix Si4420DY
or Siliconix Si4410DY
International Rectifier
IRF7413,
Fairchild NDS8410A,
or Siliconix Si4410DY
2 x 22µF, 35V
AVX
TPSE226M035R0300
or
Sprague
593D226X0035E2W
International Rectifier
IRF7413,
Fairchild NDS8410A,
or Siliconix Si4410DY
2 x 22µF, 35V
AVX
TPSE226M035R0300
or
Sprague
593D226X0035E2W
C1 Input
Capacitor
4.7µF, 25V ceramic
Tokin C34Y5U1E475Z
or Marcon/United
Chemicon
THCR40E1E475Z
2 x 10µF, 25V ceramic
Tokin C34Y5U1E106Z
or Marcon/United
Chemicon
THCR50E1E106ZT
4 x 10µF, 25V ceramic
Tokin C34Y5U1E106Z
or Marcon/United
Chemicon
THCR50E1E106ZT
4 x 390µF, 6.3V low-
ESR, Sprague
594D397X06R3R2T,
or 4 x 470µF, 4V
Sprague
594D477X0004R2T
0.010Ω, 1% (2512)
Dale
WSL-2512-R010F
2.2µH
Panasonic P1F2R0HL,
Sumida
CDRH127-2R4,
Coiltronics
UP4-2R2, or
Coilcraft
DO5022P-222HC
C2 Output
Capacitor
220µF, 6.3V tantalum
Sprague
595D227X96R3C2
2 x 470µF,
4V low-ESR
Sprague
594D477X0004R2T
2x 220µF
Sprague 594D
594D227X0010D2T
2x 220µF
Sprague 594D
594D227X0010D2T
R1 Resistor
0.070Ω, 1% (1206)
Dale
WSL-1206-R070F
0.015Ω, 1% (2512)
Dale
WSL-2512-R015F
4.6µH
Panasonic
ETQP1F4R6H,
Sumida
CDRH127-4R7,
Coiltronics
UP2-4R7, or
Coilcraft
DO3316P-472
0.020Ω, 1% (2010)
Dale
WSL-2010-R020F
0.020Ω, 1% (2010)
Dale
WSL-2010-R020F
L1 Inductor
15µH
Sumida CD54-150
10µH
Sumida
CDRH125-100,
Coiltronics
UP2-100, or
Coilcraft
DO3316-103
10µH
Sumida
CDRH125-100,
Coiltronics
UP2-100, or
Coilcraft
DO3316-103
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
