12/28/01 Generate Memory Termination Voltages with MAX1917 using
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MAX1917 Application Circuits MAXIM CONFIDENTIAL
12/28/01
Generate Memory Termination Voltages with MAX1917 using 3.3V Supply
input voltage 2.5V 1.5V dc-dc converter same board where MAX1917 located, following schematics both 1.25V 0.75V applications.
Customer's logic level, 2.5V 1.5V Reference Input 0.47uF/10V EN/HSD MAX1916 2N7002K 0.47uF/10V ILIM 348k FSEL PGND VTTR VTTR 1uF/6.3V CMPSH-3S 0.22uF 4.7uF 6.3V 5.1k
2.5V 1.5V
6.3V
2X220uF 1.25V/3.5A 0.75V/3.5A
0.68uH/5A Si4808DY
VOUT
10uF 6.3V
3X270uF PGND
Figure Schematics with supply available.
Table Bill Materials: Comp. Description 1.0uF/6.3V ceramic capacitor, JMK107BJ105MA 2X220uF/4V POSCAP, 4TPA220M, 2X330uF/6V tantalum capacitor, T510X337M006AS 4.7uF/10V ceramic capacitor, LMK316BJ475ML 0.47uF/10V ceramic capacitor, LMK107BJ474MA 10uF/6.3V ceramic capacitor, JMK316BJ106ML 3X270uF polymer caps (Panasonic EEFUE0E271R) 0.47uF/25V ceramic capacitor, TMK316BJ474ML 30V/100mA Schottky diode, CMPSH-3S 0.68uH/9A, DO3316P681HC (esr, max) Si4808DY Si4830DY 348k, 5.1k, 20k, MAX1917
Comments Taiyo Yuden SANYO Kemet Taiyo Yuden Taiyo Yuden Taiyo Yuden Panasonic Taiyo Yuden Central Semi. Coilcraft Vishay Siliconix
MAXIM
MAX1917 Application Circuits MAXIM CONFIDENTIAL
12/28/01
input voltage 2.5V 1.5V dc-dc converter 3.3V same board where MAX1917 located, also switching node accessible, following schematics both 1.25V 0.75V applications. form voltage doubler double 3.3V input voltage feed
3.3V CMPSH-3S 0.47uF Supply Converter
Voltage doubler VDD=2.5V 1.5V VOUT
Supply Controller
switching node
PGND
Customer's logic level, 2.5V 1.5V Reference Input
0.47uF
5.1k
2.5V 1.5V PGND VTTR VTTR 1uF/6.3V Si4808DY 10uF 6.3V 3X270uF PGND CMPSH-3S 0.22uF 4.7uF 6.3V 6.3V 2X220uF 1.25V/3.5A 0.75V/3.5A 0.68uH/5A VOUT
EN/HSD MAX1916 0.47uF/10V 348k ILIM FSEL
0.47uF/10V
2N7002K
Figure Schematics with voltage doubler from 2.5V 1.5V dc-dc converter.
Table Additional Bill Materials over schematics Figure Comp. Description C10, 0.47uF/10V ceramic capacitor, LMK107BJ474MA 30V/100mA Schottky diode, CMPSH-3S
Comments Taiyo Yuden Central Semi.
MAX1917 Application Circuits MAXIM CONFIDENTIAL
12/28/01
III.
input voltage 2.5V 1.5V dc-dc converter 3.3V switching node, accessible, charge pump, such MAX1683, should used double 3.3V input voltage supply MAX1917. Following schematic shows MAX1917, together with MAX1683, operates from 3.3V input.
MAX1683EUK 10uF 6.3V
3.3V
Customer's logic level, 2.5V 1.5V Reference Input
10uF
5.1k
2.5V 1.5V PGND VTTR VTTR 1uF/6.3V Si4808DY 6.3V 3X270uF PGND CMPSH-3 0.22uF 4.7uF 6.3V
EN/HSD MAX1916
6.3V
330uF 1.25V/3.5A 0.75V/3.5A
0.47uF/6.3V
0.68uH/5A
VOUT
2N7002K 0.47uF/10V
ILIM 100k FSEL
Figure Schematics with 1683 charge pump generate supply MAX1917.
Table III: Additional Bill Materials over Figure Comp. Description 10uF/6.3V ceramic capacitor, JMK316BJ106ML 10uF/10V ceramic capacitor, LMK325BJ106MN MAX1683
Comments Taiyo Yuden Taiyo Yuden MAXIM
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