xDSL/Cable Modem Triple/Quintuple Output

Power Supplies

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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

VL Output Current ...............................................................50mA

VL Short Circuit to GND...................................................

≤100ms

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)

4.5

28

V

MAX1864

1.0

2

Quiescent Supply Current

MAX1865

1.4

3

mA

VL REGULATOR

Output Voltage

VL

4.75

5.00

5.25

V

Power-Supply Rejection

PSRR

3

%

Undervoltage Lockout Trip Level

VL rising, 3% hysteresis (typ)

3.2

3.5

3.8

V

Minimum Bypass Capacitance

10m

Ω < ESR < 500mΩ

1µF

DC-DC CONTROLLER

Output Voltage (Preset Mode)

FB = GND

3.272

3.314

3.355

V

Typical Output Voltage Range

(Adjustable Mode) (Note 2)

1.236

V

FB Set Voltage

(Adjustable Mode)

FB = COMP

1.221

1.236

1.252

V

FB Dual Mode™ Threshold

50

100

150

mV

FB Input Leakage Current

0.01

100

nA

FB to COMP Transconductance

±5µA

70

100

140

µS

Current-Sense Amplifier Voltage

Gain

4.46

4.9

5.44

V/V

Current-Limit Threshold

(Internal Mode)

190

250

310

mV

Current-Limit Threshold

(External Mode)

440

530

620

mV

Dual Mode is a trademark of Maxim Integrated Products, Inc.