MAX1960/MAX1961/MAX1962
2.35V to 5.5V, 0.5% Accurate, 1MHz PWM
Step-Down Controllers with Voltage Margining
22 ______________________________________________________________________________________
V
OUT
= 3.3V V
OUT
= 2.5V V
OUT
= 1.8V V
OUT
= 1.5V
V
IN
R1 (kΩ) R3 (kΩ) C9 (µF) R1 (kΩ) R3 (kΩ) C9 (µF) R1 (kΩ) R3 (kΩ) C9 (µF) R1 (Ω) R3 (kΩ) C9 (µF)
5V 3.12 1.2 0.0068 2.13 9.1 0.01 1.24 6.8 0.01 876 5.5 0.01
3.3V — — — — — — 1.24 2.7 0.01 876 2.4 0.01
2.5V — — — — — — 1.24 3.9 0.01 876 3.3 0.01
Table 4. R1, R3, and C9 Component Values for 1MHz Operation
SUPPLIER PHONE WEBSITE
C entr al S em i cond uctor 631- 435- 1110 w w w .centr al sem i .com
International Rectifier 310-322-3331 www.irf.com
Kamaya 260-489-1533 www.kamaya.com
Murata 814-237-1431 www.murata.com
Panasonic 714-373-7939 www.panasonic.com
Sanyo 619-661-6835 www.sanyo.com
Sumida 847-956-0666 www.sumida.com
Taiyo Yuden 408-573-4150 www.t-yuden.com
Table 6. Component Suppliers
PART
VOLTAGE
MARGINING
CURRENT
LIMIT
OUTPUT
VOLTAGE
MAX1960 Adjustable
MAX1961
±4%
FET V
DS
Sensing
4 Presets
MAX1962 No
±10% with
R
SENSE
4 Presets or
Adjustable
V
OUT
= 3.3V V
OUT
= 2.5V V
OUT
= 1.8V V
OUT
= 1.5V
V
IN
R1 (kΩ) R3 (kΩ) C9 (µF) R1 (kΩ) R3 (kΩ) C9 (µF) R1 (kΩ) R3 (kΩ) C9 (µF) R1 (Ω) R3 (kΩ) C9 (µF)
5V 3.12 36 0.0033 2.13 27 0.0047 1.24 20 0.0068 876 16 0.0068
3.3V — — — 2.13 47 0.0033 1.24 30 0.0047 876 27 0.0047
2.5V — — — — — — 1.24 39 0.0033 876 33 0.0033
Table 5. R1, R3, and C9 Component Values for 500kHz Operation
