Owner manual

MAX1864/MAX1865
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
_______________________________________________________________________________________ 5
Note 1: Connect VL to IN for operation with V
IN
< 5V.
Note 2: See Output Voltage Selection section.
Note 3: The internal 5V linear regulator (VL) powers the thermal shutdown block. Shorting VL to GND disables thermal shutdown.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, ILIM = FB = GND, V
BST
- V
LX
= 5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
POWER GOOD (POK)
OUT Trip Level (Preset Mode) FB = GND, falling edge, 1% hysteresis (typ) 2.85 3.15 V
FB Trip Level
(Adjustable Mode)
Falling edge, 1% hysteresis (typ) 1.058 1.17 V
FB2, FB3, FB4 Trip Level Falling edge, 1% hysteresis (typ) 1.058 1.17 V
FB5 Trip Level Rising edge, 35mV hysteresis (typ) 325 675 mV
50
0.01 1010.1
EFFICIENCY vs. LOAD CURRENT
(PRESET MODE)
100
70
60
90
80
MAX1864/65 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
V
IN
= 6.5V
V
IN
= 8V
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
V
OUT
= 3.3V
3.27
3.29
3.28
3.31
3.30
3.32
3.33
0 1.0 1.50.5 2.0 2.5 3.0
OUTPUT VOLTAGE vs. LOAD CURRENT
(PRESET MODE)
MAX1864/65 toc02
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
50
0.01 1010.1
EFFICIENCY vs. LOAD CURRENT
(ADJUSTABLE MODE)
100
70
60
90
80
MAX1864/65 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
V
IN
= 6.5V
V
IN
= 8V
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
V
OUT
= 5.0V
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= 12V, V
OUT
= 3.3V, T
A
= +25°C, unless otherwise noted.)