MAX1999 Evaluation MAX1999 evaluation kit) demonstrates MAX1999's

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MAX1999 Evaluation MAX1999 evaluation kit) demonstrates MAX1999's

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19-2499; 7/02
MAX1999 Evaluation
MAX1999 evaluation kit) demonstrates MAX1999's standard application circuit. This DC-DC converter steps down high-voltage batteries and/or adapters, generating system supplies notebook computers. MAX1999 provides dual 3.3V output voltages from battery input range. delivers output current output 3.3V output with greater than efficiency. operates 200kHz/300kHz switching frequency (5V/3.3V, respectively) superior line-and-loadtransient response. This fully assembled tested circuit board. allows evaluation other output voltages 5.5V range changing feedback resistors R1-R4. This also used evaluate MAX1777 (200kHz/5.0V SMPS 300kHz/3.3V SMPS) MAX1977 (400kHz/5.0V SMPS 500kHz/3.3V SMPS). Input Voltage Range 3.3V Output Voltages 5.5V Adjustable Outputs (External Resistors) Output Current (3.3V Output) Output Current Output) Current-Sense Resistor Needed (MAX1999) Accurate Current Sense with Current-Sense Resistor (MAX1777/MAX1977) 200kHz/300kHz Switching Frequency (5V/3.3V, Respectively) Power-Good (PGOOD) Output Fault Protection Enable/Disable 28-Pin QSOP Package Low-Profile Components Fully Assembled Tested
Features
Evaluates: MAX1777/MAX1977/MAX1999
Ordering Information
PART MAX1999EVKIT TEMP RANGE +70oC PACKAGE QSOP
Note: evaluate MAX1777/MAX1977, request MAX1777EEI/MAX1977EEI free sample with MAX1999EVKIT.
Component List
DESIGNATION DESCRIPTION 10µF, ceramic capacitors (1812) Taiyo Yuden TMK432BJ106KM C4532X5R1E106M installed (1812) installed, case 470µF, 40m, low-ESR capacitor, case Sanyo 4TPB470M 330µF, 6.3V, 40m, low-ESR capacitor, case Sanyo 6TPB330M 0.1µF ceramic capacitors (0805) 1µF, ceramic capacitors (0805) Taiyo Yuden LMK212BJ105KG C2012X5R105M DESIGNATION C13, DESCRIPTION installed 0.22µF, ceramic capacitor (0805) Taiyo Yuden EMK212BJ224KG 4.7µF, tantalum capacitor, case Sprague 595D475X0035C2B 4.7µF, tantalum capacitors, case Sprague 595D475X0016A2B 100mA, dual Schottky diode Central Semiconductor CMPSH-3A Schottky diodes Nihon EP10QY03 Toshiba CRS02 3-pin headers 4-pin headers
C18,
C10, C12,
JU1, JU3,
C11,
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
MAX1999 Evaluation Evaluates: MAX1777/MAX1977/MAX1999
Component List (continued)
DESIGNATION DESCRIPTION 7.6µH, 5.9A power inductor Sumida CDRH127-7R6 4.7µH, 5.7A power inductor Sumida CDRH124-4R7 N-channel MOSFET, 8-pin International Rectifier IRF7807V Fairchild FDS6612A N-channel MOSFET, 8-pin International Rectifier IRF7811AV Fairchild FDS6670A installed (0805) installed, short trace (0805) resistor (1206) DESIGNATION R15, None None None None None DESCRIPTION 100k resistor (0805) resistors (0805) resistors (0805) installed, short trace (2010) resistor (0805) MAX1999EEI, 28-pin QSOP Shunts (JU1, JU2, JU3, JU5) Rubber feet MAX1999 board MAX1999 data sheet MAX1999 data sheet
R10-R14
Component Suppliers
SUPPLIER Central Semiconductor Fairchild International Rectifier Nihon Sanyo Sprague/Vishay Sumida Taiyo Yuden PHONE 516-435-1110 408-721-2181 310-322-3331 847-843-7500 619-661-6835 270-324-4140 708-956-0666 408-573-4150 847-390-4373 516-435-1824 408-721-1635 310-322-3332 847-843-2798 619-661-1055 270-490-7222 708-956-0702 408-573-4159 847-390-4428 WEBSITE www.centralsemi.com www.fairchildsemi.com www.irf.com www.niec.co.jp www.sumida.com www.vishay.com www.sumida.com www.t-yuden.com www.component.tdk.com
Note: Please indicate that using MAX1999 when contacting these component suppliers.
Recommended Equipment
power supply, battery, notebook adapter Dummy loads capable sinking Digital multimeters (DMMs) 100MHz dual-trace oscilloscope
Verify that shunts across pins pins pins pins Turn power supply. Verify that output voltages 3.3V
Evaluating Other Output Voltages
Quick Start
Ensure that circuit connected correctly supplies dummy load before applying power.
outputs preset 3.3V However, output voltages also adjusted between 5.5V selecting R1/R2 R3/R4 values. Select feedback resistors then given [(VOUT/VFB) where
MAX1999 Evaluation Evaluates: MAX1777/MAX1977/MAX1999
OPEN OPEN
OPEN
OPEN
LD05
10µF
10µF
BST5
4.7µF
0.1µF
ILIM3
ILIM5
LDO5
4.7µF
0.1µF C13* OPEN
BST5
VOUT2 +5V,
7.6µH
MAX1999 (MAX1777) (MAX1977)
BST3
BST5
10µF
OPEN
0.1µF C14* OPEN
4.7µH
VOUT1 3.3V,
330µF 6.3V
OPEN
(CS5) N.C. (CS3)
OPEN
470µF
OPEN
SHORT TRACE)
OPEN
SHORT TRACE) OPEN
ON/OFF
OUT3
OUT5 100k PGOOD PGOOD
SHORT TRACE)
SHORT TRACE)
3.3V ON/OFF
SHDN
SKIP
LD03 3.3V 0.22µF 0.1µF 4.7µF *OPTIONAL REQUIRED ULTRASONIC MODE OPERATION (MAX1999 ONLY). TABLE
SHDN LD03
Figure MAX1999 Schematic
Evaluating MAX1777/MAX1977
This also used evaluate MAX1777/ MAX1977. MAX1777 operates 200kHz/300kHz switching frequency MAX1977 operates 400kHz/500kHz switching frequency (5V/3.3V). MAX1777 MAX1977 accurate currentsense resistors, R16:
Remove MAX1999 install MAX1777 MAX1977. open traces shorting sense resistors R16. Install sense resistors R16. Short resistor (leave open).
MAX1999 Evaluation Evaluates: MAX1777/MAX1977/MAX1999
Jumper Settings
Table Jumper Functions (SHDN Mode Selection)
SHDN Connected MAX1999 OUTPUT MAX1999 enabled; REF, LDO3, LDO5 active; VOUT1 (3.3V) depends JU3; VOUT2 (5.0V) depends Shutdown mode; REF, LDO3, LDO5 off; VOUT1 VOUT2 MAX1999 driven external signal
installed
Connected Connected SHDN
Table Jumper Functions (SKIP Mode Selection)
SKIP Connected Connected OPERATING MODE Low-noise mode, forced fixed-frequency operation. Normal operation, allows automatic PWM/PFM switchover pulse-skipping light load, resulting highest efficiency. Ultrasonic pulse-skipping mode (20kHz min). Install C13, (470pF) MAX1999 ultrasonic mode operation ensure proper negative ultrasonic current sensing (VNEG(µs)).
installed
Floating
Table Jumper Functions (Output Voltage VOUT1 Control)
Connected Connected (ON5 VCC) Connected OUTPUT VOLTAGE (VOUT1) VOUT1 disabled VOUT1 (3.3V) starts after VOUT2 (5V) reaches regulation VOUT1 3.3V, enabled
Table Jumper Functions (Protection Selection)
Installed Connected Connected through resistor PROTECTION Undervoltage overvoltage fault protection disabled. Undervoltage overvoltage fault protection enabled. Refer Fault Protection section MAX1999 data sheet more information.
installed
MAX1999 Evaluation
Jumper Settings (continued)
Table Jumper Functions (Output Voltage VOUT2 Control)
Connected Connected (ON3 VCC) Connected OUTPUT VOLTAGE (VOUT2) VOUT2 disabled VOUT2 (5V) starts after VOUT1 (3.3V) reaches regulation VOUT2 enabled
Evaluates: MAX1777/MAX1977/MAX1999
Table Jumper Functions (Switching-Frequency Selection)
installed Installed Connected through resistor Connected FREQUENCY (kHz) 200/300 shipped) 400/500
Important: change operating frequency without first recalculating component values. switching frequency significant effect peak current-limit level, MOSFET heating, preferred inductor value, PFM/PWM switchover point, output noise, efficiency, other critical parameters.
Table Jumper Functions (Fixed/Adjustable Current-Limit Selection VOUT2)
SHORT ILIM5 Connected through board trace. Connected through resistor-divider R13/R14. Refer Current-Limit Circuit section MAX1999 data sheet information selecting R13/R14. CURRENT-LIMIT THRESHOLD (mV) (default)
OPEN
Adjustable from
Table Jumper Functions (Fixed/Adjustable Current-Limit Selection VOUT1)
SHORT ILIM3 Connected through board trace. Connected through resistor-divider R11/R12. Refer Current-Limit Circuit section MAX1999 data sheet information selecting R11/R12. CURRENT-LIMIT THRESHOLD (mV) (default)
OPEN
Adjustable from
MAX1999 Evaluation Evaluates: MAX1777/MAX1977/MAX1999
Figure MAX1999 Component Placement Guide- Silkscreen
Figure MAX1999 Board Layout-Component Side
MAX1999 Evaluation Evaluates: MAX1777/MAX1977/MAX1999
Figure MAX1999 Board Layout-Ground Layer
Figure MAX1999 Board Layout-Ground Layer
MAX1999 Evaluation Evaluates: MAX1777/MAX1977/MAX1999
Figure MAX1999 Board Layout-Solder Side
Figure MAX1999 Component Placement Guide- Bottom Silkscreen
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 2002 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX1999 Evaluation MAX1999 evaluation kit) demonstrates MAX1999's

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