MAX796CSE datasheet(11/32 Pages) MAXIM

Part #	MAX796CSE

Description	Step-Down Controllers with Synchronous Rectifier for CPU Power

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Manufacturer	MAXIM [Maxim Integrated Products]

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Step-Down Controllers with

Synchronous Rectifier for CPU Power

______________________________________________________________________________________

11

Table 1. Component Selection for Standard 3.3V Applications

Table 2. Component Suppliers

*

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

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.

[1] 714-960-6492

(714) 969-2491

Matsuo

[1] 512-992-3377

(512) 992-7900

IRC

[1] 310-322-3332

(310) 322-3331

International Rectifier

[1] 605-665-1627

(605) 668-4131

Dale

[1] 561-241-9339

(561) 241-7876

Coiltronics

[1] 847-639-1469

(847) 639-6400

Coilcraft

[1] 516-435-1824

(516) 435-1110

Central Semiconductor

[1] 803-626-3123

(803) 946-0690

AVX

FACTORY FAX

[Country Code]

USA PHONE

MANUFACTURER

[1] 864-963-6521

(864) 963-6300

Kemet

1.5µH, 11A, 3.5m

Ω

Coiltronics

CTX03-12357-1

4.7µH, 5.5A Ferrite

Coilcraft DO3316-472

10µH, 3A Ferrite

Sumida CDRH125

33µH, 2.2A Ferrite

Dale LPE6562-330MB

47µH, 1.2A Ferrite or

Kool-Mu

Sumida CD75-470

L1 Inductor

3 x 0.02

Ω IRC

LR2010-01-R020

(3 in parallel)

0.015

Ω IRC

LR2010-01-015

0.025

Ω IRC

LR2010-01-R025

0.039

Ω IRC

LR2010-01-R039

0.062

Ω IRC

LR2010-01-R062

R1 Resistor

1N5820 NIEC

NSQ03A02, or

Motorola MBRS340T3

1N5821 NIEC

NSQ03A04 or

Motorola MBRS340T3

1N5819 NIEC

EC10QS03 or

Motorola MBRS130T3

1N5817 NIEC

EC10QS02L or

Motorola MBRS130T3

1N5817 Motorola

MBR0502L SOD-89

D1 Rectifier

4 x 220µF, 10V

Sanyo OS-CON

10SA220M

3 x 220µF, 10V AVX

TPS or Sprague 595D

220µF, 10V AVX TPS

or Sprague 595D

150µF, 10V AVX TPS

or Sprague 595D

150µF, 10V AVX TPS

or Sprague 595D

C2 Output

Capacitor

2 x 220µF, 10V

Sanyo OS-CON

10SA220M

4 x 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

22µF, 35V AVX TPS

or Sprague 595D

C1 Input

Capacitor

Motorola

MTD75N03HDL

D2PAK

Motorola

MTD20N03HDL

DPAK

Motorola

MMSF5N03HD or

Si9410

Motorola 1/2

MMDF3N03HD or 1/2

Si9936

International Rectifier

1/2 IRF7101

Q2 Low-Side

MOSFET

Motorola

MTD75N03HDL

D2PAK

Motorola

MTD20N03HDL

DPAK

Motorola

MMSF5N03HD or

Si9410

Motorola 1/2

MMDF3N03HD or 1/2

Si9936

International Rectifier

1/2 IRF7101

Q1 High-Side

MOSFET

4.5V to 6V

4.75V to 24V

4.75V to 28V

4.75V to 18V

Input Range

{1} 847-390-4405

(847) 390-4461

TDK

[81] 3-3607-5144

(847) 956-0666

Sumida

[1] 603-224-1430

(603) 224-1961

Sprague

[1] 408-970-3950

(408) 988-8000

(800) 554-5565

Siliconix

[81] 7-2070-1174

(619) 661-6835

Sanyo

[81] 3-3494-7414

(805) 867-2555*

NIEC

[1] 814-238-0490

(814) 237-1431

(800) 831-9172

Murata-Erie

FACTORY FAX

[Country Code]

USA PHONE

MANUFACTURER

[1] 702-831-3521

(702) 831-0140

Transpower Technologies

[1] 602-994-6430

(602) 303-5454

Motorola

LOAD CURRENT

10A

4A

3A

2A

1A

COMPONENT

300kHz

150kHz

Frequency

Desktop 5V-to-3V

High-End Notebook

Notebook

Sub-Notebook

PDA

Application

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