Rainbow Electronics MAX1865 User Manual
Page 2
MAX1864/MAX1865
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 12V, ILIM = FB = GND, V
BST
- V
LX
= 5V, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, B2, B3, B4 to GND............................................-0.3V to +30V
B5 to OUT...............................................................-20V to +0.3V
VL, POK, FB, FB2, FB3, FB4, FB5 to GND ...............-0.3V to +6V
LX to BST..................................................................-6V to +0.3V
BST to GND ............................................................-0.3V to +36V
DH to LX ....................................................-0.3V to (V
BST
+ 0.3V)
DL, OUT, COMP, ILIM to GND......................-0.3V to (V
L
+ 0.3V)
VL Output Current ...............................................................50mA
VL Short Circuit to GND...................................................
≤100ms
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........666mW
20-Pin QSOP (derate 9.1mW/°C above +70°C)...........727mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL
Operating Input Voltage Range
(Note 1)
V
IN
4.5
28
V
MAX1864
1.0
2
Quiescent Supply Current
I
IN
V
FB
= 0, V
OUT
= 4V,
V
FB2
= V
FB3
= V
FB4
= 1.5V,
V
FB5
= -0.1V
MAX1865
1.4
3
mA
VL REGULATOR
Output Voltage
VL
6V < V
IN
< 28V, 0.1mA < I
LOAD
< 20mA
4.75
5.00
5.25
V
Power-Supply Rejection
PSRR
V
IN
= 6V to 28V
3
%
Undervoltage Lockout Trip Level
V
UVLO
VL rising, 3% hysteresis (typ)
3.2
3.5
3.8
V
Minimum Bypass Capacitance
C
BYP(MIN)
10m
Ω < ESR < 500mΩ
1
µF
DC-DC CONTROLLER
Output Voltage (Preset Mode)
V
OUT
FB = GND
3.272
3.314
3.355
V
Typical Output Voltage Range
(Adjustable Mode) (Note 2)
V
OUT
1.236
0.8 x V
IN
V
FB Set Voltage
(Adjustable Mode)
V
SET
FB = COMP
1.221
1.236
1.252
V
FB Dual Mode™ Threshold
50
100
150
mV
FB Input Leakage Current
I
FB
V
FB
= 1.5V
0.01
100
nA
FB to COMP Transconductance
g
m
FB = COMP, I
COMP
=
±5µA
70
100
140
µS
Current-Sense Amplifier Voltage
Gain
A
LIM
V
IN
- V
LX
= 250mV
4.46
4.9
5.44
V/V
Current-Limit Threshold
(Internal Mode)
V
VALLEY
V
ILIM
= 5.0V
190
250
310
mV
Current-Limit Threshold
(External Mode)
V
VALLEY
V
ILIM
= 2.5V
440
530
620
mV
Dual Mode is a trademark of Maxim Integrated Products, Inc.