MAX797CSE 查看數據表（PDF） - Maxim Integrated
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MAX797CSE Datasheet PDF : 32 Pages
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Step-Down Controllers with
Synchronous Rectifier for CPU Power
Table 1. Component Selection for Standard 3.3V Applications
COMPONENT
1A
LOAD CURRENT
2A
3A
4A
10A
Input Range 4.75V to 18V
4.75V to 18V
4.75V to 28V
4.75V to 24V
4.5V to 6V
Application
PDA
Sub-Notebook
Notebook
High-End Notebook Desktop 5V-to-3V
Frequency
150kHz
300kHz
300kHz
300kHz
300kHz
Q1 High-Side
MOSFET
International Rectifier
1/2 IRF7101
Motorola 1/2
MMDF3N03HD or 1/2
Si9936
Motorola
MMSF5N03HD or
Si9410
Motorola
MTD20N03HDL
DPAK
Motorola
MTD75N03HDL
D2PAK
Q2 Low-Side
MOSFET
International Rectifier
1/2 IRF7101
Motorola 1/2
MMDF3N03HD or 1/2
Si9936
Motorola
MMSF5N03HD or
Si9410
Motorola
MTD20N03HDL
DPAK
Motorola
MTD75N03HDL
D2PAK
C1 Input
Capacitor
22µF, 35V AVX TPS
or Sprague 595D
2 x 22µF, 35V AVX
TPS or Sprague 595D
2 x 22µF, 35V AVX
TPS or Sprague 595D
4 x 22µF, 35V AVX
TPS or Sprague 595D
2 x 220µF, 10V
Sanyo OS-CON
10SA220M
C2 Output
Capacitor
150µF, 10V AVX TPS 150µF, 10V AVX TPS
or Sprague 595D or Sprague 595D
220µF, 10V AVX TPS
or Sprague 595D
3 x 220µF, 10V AVX
TPS or Sprague 595D
4 x 220µF, 10V
Sanyo OS-CON
10SA220M
D1 Rectifier
1N5817 Motorola
MBR0502L SOD-89
1N5817 NIEC
EC10QS02L or
Motorola MBRS130T3
1N5819 NIEC
1N5821 NIEC
1N5820 NIEC
EC10QS03 or
NSQ03A04 or
NSQ03A02, or
Motorola MBRS130T3 Motorola MBRS340T3 Motorola MBRS340T3
R1 Resistor
0.062Ω IRC
LR2010-01-R062
0.039Ω IRC
LR2010-01-R039
0.025Ω IRC
LR2010-01-R025
0.015Ω IRC
LR2010-01-015
3 x 0.02Ω IRC
LR2010-01-R020
(3 in parallel)
L1 Inductor
47µH, 1.2A Ferrite or
Kool-Mu
Sumida CD75-470
33µH, 2.2A Ferrite
Dale LPE6562-330MB
10µH, 3A Ferrite
Sumida CDRH125
4.7µH, 5.5A Ferrite
Coilcraft DO3316-472
1.5µH, 11A, 3.5mΩ
Coiltronics
CTX03-12357-1
Table 2. Component Suppliers
MANUFACTURER
AVX
Central Semiconductor
Coilcraft
Coiltronics
Dale
International Rectifier
IRC
Kemet
Matsuo
Motorola
USA PHONE
(803) 946-0690
(516) 435-1110
(847) 639-6400
(561) 241-7876
(605) 668-4131
(310) 322-3331
(512) 992-7900
(864) 963-6300
(714) 969-2491
(602) 303-5454
FACTORY FAX
[Country Code]
[1] 803-626-3123
[1] 516-435-1824
[1] 847-639-1469
[1] 561-241-9339
[1] 605-665-1627
[1] 310-322-3332
[1] 512-992-3377
[1] 864-963-6521
[1] 714-960-6492
[1] 602-994-6430
* Distributor
losses due to MOSFET gate charge. The step-down
power-switching circuit consists of two N-channel
MOSFETs, a rectifier, and an LC output filter. The out-
put voltage is the average of the AC voltage at the
switching node, which is adjusted and regulated by
changing the duty cycle of the MOSFET switches. The
MANUFACTURER
USA PHONE
FACTORY FAX
[Country Code]
Murata-Erie
(814) 237-1431
(800) 831-9172
[1] 814-238-0490
NIEC
(805) 867-2555* [81] 3-3494-7414
Sanyo
(619) 661-6835 [81] 7-2070-1174
Siliconix
(408) 988-8000
(800) 554-5565
[1] 408-970-3950
Sprague
(603) 224-1961 [1] 603-224-1430
Sumida
(847) 956-0666 [81] 3-3607-5144
TDK
(847) 390-4461 {1} 847-390-4405
Transpower Technologies (702) 831-0140 [1] 702-831-3521
gate-drive signal to the N-channel high-side MOSFET
must exceed the battery voltage and is provided by a
flying capacitor boost circuit that uses a 100nF capaci-
tor connected to BST.
The MAX796 contains nine major circuit blocks, which
are shown in Figure 2.
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