MAX1809EEE datasheet(2/17 Pages) MAXIM

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3A, 1MHz, DDR Memory Termination Supply

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = VCC = 3.3V, VEXTREF = 1.1V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

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.

Note 1: LX has clamp diodes to PGND and IN. If continuous current is applied through these diodes, thermal limits must be

observed.

VCC, IN to GND ........................................................-0.3V to +6V

IN to VCC.............................................................................±0.3V

GND to PGND.....................................................................±0.3V

SHDN, SS, FB, TOFF, RREF,

EXTREF to GND.......................................-0.3V to (VCC + 0.3V)

LX Current (Note 1).............................................................±4.7A

REF Short Circuit to GND Duration ............................Continuous

Continuous Power Dissipation (TA = +70°C)

28-Pin QFN (derate 20mW/°C above +70°C;

part mounted on 1in2 of 1oz copper) ..............................1.6W

16-Pin QSOP (derate 12.5mW/°C above +70°C;

part mounted on 1in2 of 1oz copper) .................................1W

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

Input Voltage

VIN,VCC

3.0

5.5

Feedback Voltage Accuracy

(VFB - VEXTREF)

VIN = VCC = 3V to 5.5V, ILOAD = 0,

VEXTREF = 1.25V (Note 2)

-12

+12

Feedback Load Regulation Error

∆VFB

ILOAD = -3A to +3A, VEXTREF = 1.25V

External Reference Voltage

Range

VEXTREF

VIN = VCC = 3V to 5.5V

VREF -

0.01

VIN -

1.7

Reference Voltage

VREF

1.078

1.100

1.122

Reference Load Regulation

IREF = -1µA to +10µA

0.5

2.0

VIN = 4.5V

200

PMOS Switch

On-Resistance

RPMOS

ILX = 0.5A

VIN = 3V

110

250

Ω

VIN = 4.5V

150

NMOS Switch

On-Resistance

RNMOS

ILX = 0.5A

VIN = 3V

200

Ω

Current-Limit Threshold

ILIMIT

VIN > VLX

3.5

4.1

4.7

Switching Frequency

fSW

(Note 3)

MHz

ICC

fSW = 500kHz

No Load Supply Current

IIN

fSW = 500kHz

Shutdown Supply Current

ISHDN

SHDN = GND, ICC + IIN

µA

Thermal-Shutdown Threshold

Hysteresis = 15

°C

160

°C

Undervoltage Lockout Threshold

VCC falling, hysteresis = 90mV

2.5

2.6

2.7

FB Input Bias Current

IFB

VFB = VEXTREF + 0.1V

250

RTOFF = 30.1k

Ω

0.24

0.30

0.37

RTOFF = 110k

Ω

0.9

1.0

1.1

Off-Time

tOFF

RTOFF = 499k

Ω

3.8

4.5

5.2

µs

Startup Off-Time

4 x tOFF

µs

On-Time

tON

(Note 3)

0.35

µs

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