MAX668 Evaluation MAX668 evaluation kit) combines constant-freque

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MAX668 Evaluation MAX668 evaluation kit) combines constant-freque

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19-4778; 8/98
MAX668 Evaluation
MAX668 evaluation kit) combines constant-frequency, pulse-width-modulation (PWM) stepup controller with external N-channel MOSFET Schottky diode provide regulated output voltage. accepts VOUT input converts +12V output currents with greater than conversion efficiency. operates 500kHz, allowing small external components. MAX668 fully assembled tested surface-mount circuit board. This also configured application circuits listed Application Circuit Capabilities table. input voltages below down 1.8V, replace MAX668 with MAX669. MAX669 must always operate bootstrapped mode (JU2 shunt across pins +12V Adjustable Output Voltage Output Current N-Channel External MOSFET Shutdown Current 500kHz Switching Frequency Surface-Mount Components Fully Assembled Tested
Features
VOUT Input Range shipped)
Evaluates: MAX668/MAX669
Component List
DESIGNATION DESCRIPTION 68µF, 20V, low-ESR tantalum Sprague 593D686X0020E2W TPSE686M020R0150 120µF, 20V, low-ESR tantalum Sprague 594D127X0020R2T 0.1µF ceramic capacitor 0.22µF ceramic capacitor ceramic capacitors 220pF ceramic capacitor installed Schottky diode Hitachi HRF302A Motorola MBRS340T3 4.7µH power inductor Sumida CDRH104-4R7 (shielded), Coiltronics UP2B-4R7, Coilcraft DO3316P-472 N-channel MOSFET Fairchild FDS6680 International Rectifier IRF7801 0.020, 1/2W resistor Dale WSL-2010-R020F LR2010-01-R020F 218k, resistor 24.9k, resistor 100k, resistor MAX668EUB 3-pin headers 2-pin header Shunts (JU1, JU2) MAX668/MAX669 board MAX668/MAX669 data sheet
Ordering Information
PART MAX668EVKIT TEMP. RANGE +70°C PACKAGE µMAX
Note: evaluate MAX669, request MAX669EUB free sample with MAX668EVKIT.
Application Circuit Capabilities
VIN(MIN) VOUT IOUT 0.65 0.02
JU1, None None None
Note: Design information these applications included. shaded shows configuration shipped.
Maxim Integrated Products
free samples latest literature: http://www.maxim-ic.com, phone 1-800-998-8800. small orders, phone 408-737-7600 ext. 3468.
MAX668 Evaluation Evaluates: MAX668/MAX669
Component Suppliers
SUPPLIER CoilCraft Coiltronics Dale-Vishay Fairchild Hitachi International Rectifier Motorola Siliconix Sprague Sumida Vishay/Vitramon PHONE 803-946-0690 708-639-6400 561-241-7876 402-564-3131 408-721-2181 888-777-0384 310-322-3331 512-992-7900 602-303-5454 408-988-8000 603-224-1961 708-956-0666 203-268-6261 803-626-3123 708-639-1469 561-241-9339 402-563-6418 408-721-1635 650-244-7947 310-322-3332 512-992-3377 602-994-6430 408-970-3950 603-224-1430 708-956-0702 203-452-5670
Note: Please indicate that using MAX668 when contacting these component suppliers.
minimum input voltage below +3.0V, MAX669 with bootstrapped from VOUT (Table bootstrapped mode, VOUT always less than +5.5V, then shorted eliminate dropout voltage regulator. This increases gate drive MOSFET, which lowers MOSFET on-resistance increases MAX668 supply current gate-charge loss. greater than +3.0V, MAX668's powered from VIN. This will decrease quiescent power dissipation, especially when large. always less than +5.5V, shorted eliminate dropout voltage regulator. range +4.5V, then user still want bootstrap from VOUT increase gate drive MOSFET expense power dissipation. always greater than +4.5V, input should always tied VIN, since bootstrapping from VOUT will increase gate drive from LDO, quiescent power dissipation will rise. Jumpers control inputs (see MAX668/MAX669 data sheet).
Jumper Selection
_Quick Start
MAX668 fully assembled tested. Follow these steps verify board operation. turn power supply until connections completed. Place shunt across pins Verify that shunt across pins (VCC tied VIN) open (LDO open). Connect supply pad. Connect ground pad. Connect voltmeter VOUT pad. Turn power supply verify that output voltage 12V.
3-pin header selects shutdown mode. Table lists selectable jumper options. 3-pin header selects bootstrapped mode. Table lists selectable jumper options. less than 5.5V, 2-pin header short VCC. This eliminates internal linear regulator (LDO) dropout voltage. MAX668, this allows operation with input voltages down 2.7V. Table lists selectable jumper options.
Other Output Voltages
MAX668 also used evaluate other output voltages. Refer Output Voltage Selection section MAX668 data sheet instructions selecting feedback resistors output voltages greater than 15V, replace (20V) with capacitor that higher voltage rating. addition standard configuration 3VIN Application Circuit Capabilities table listed several common Input/Output combinations. Table lists components recommended these alternative circuits.
_Detailed Description
MAX668 provides regulated +12V output voltage from input source +3V. drives loads with greater than conversion efficiency. This shipped configured nonbootstrapped mode (VCC tied VIN). However, there several methods connecting depending specific design including input output voltage range, quiescent power dissipation, MOSFET selection, load.
MAX668 Evaluation Evaluates: MAX668/MAX669
Table Jumper Functions
SHUNT LOCATION installed SYNC/SHDN Connected Connected Floating MAX668 OUTPUT MAX668 enabled, VOUT 12V. MAX668 operates internal frequency. Shutdown mode, VOUT diode MAX668 externally synchronized when SYNC/SHDN clocked.
Table Jumper Functions
SHUNT LOCATION Connected VOUT Connected MAX668 MODE Bootstrapped mode Non-bootstrapped mode
Table Jumper Functions
SHUNT LOCATION Connected Open
MAX668 Evaluation Evaluates: MAX668/MAX669
Table Components Alternate Application Circuits
(MIN)
VOUT IOUT
MAXIM PART
BOOTSTRAPPED NON-BOOTSTRAPPED
(µH)
Sumida MAX669 Bootstrapped CDRH10 4-4R7 Coilcraft MAX669 Bootstrapped D03316102 Sumida MAX669 Bootstrapped CDRH10 4-4R7 Sumida MAX668 Bootstrapped CDRH12 7-4R7
Dale WSL- 24.9 2010R020F Dale WSL- 24.9 2010R015F Dale WSL- 24.9 2010R020F Dale WSL2512R015F
Hitachi HRF302A
68µF 120µF International Sprague Rectifier IRF7401 TPSE686M 594D127X 020R0150 0020R2T
Open
Hitachi HRF302A
68µF 22µF 22µF International Rectifier TPSE686M TPSE226M TPSE226M IRF7401 020R0150 035R0300 035R0300 68µF 120µF International Rectifier Sprague IRF7401 TPSE686M 594D127X 020R0150 0020R2T 330µF Kemet T510X337 M010
0.65
Hitachi HRF302A
Open
24.9
Hitachi HRF502A
Fairchild FDS6680
330µF 330µF Kemet Kemet T510X337 T510X337 M010 M010
0.020 MAX668
NonBootstrapped
Sumida CD434R7
Dale WSL- 24.9 1206R100F
Central Semiconductor CMPD914
Fairchild FDS5610
10µF 2.2µF 6.3V, 50V, Taiyo Kemet Yuden C1825C22 JMK325BJ1 5MR0RAC 06MN
Open
MAX668 NonBootstrapped
Sumida CD73220
Dale Motorola WSL- 24.9 MBRS140T3 2010R050F
Fairchild FDS6680
33µF 22µF TPSD336M TPSE226M 020R0200 035R0300
Open
Note: This table lists components recommended building other application circuits using MAX668 kit.
68µF 4.7µH
Figure MAX668 Schematic
MBRS340T3 120µF
MAX668
0.02 PGND 0.22µF FREQ 100k SYNC/ SHDN VOUT 0.1µF
VOUT 12V, OPEN
SYNC/ SHDN
218k
1.25V
Evaluates: MAX668/MAX669
220pF 24.9k
MAX668 Evaluation
MAX668 Evaluation Evaluates: MAX668/MAX669
1.0"
Figure MAX668 Component Placement Guide- Component Side
1.0"
Figure MAX668 Board Layout-Component Side
1.0"
Figure MAX668 Board Layout-Solder Side
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 1998 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX668 Evaluation MAX668 evaluation kit) combines constant-freque

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