MAX1917EEE datasheet(2/18 Pages) MAXIM

2 / 18 page

Tracking, Sinking and Sourcing, Synchronous Buck

Controller for DDR Memory and Termination Supplies

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = 12V, VEN/HSD = VDDR = 2.5V, CVL = 4.7µF, CVTTR = 1µF, CREF = 0.22µF, VFSEL = 0, ILIM = VL, PGND = LX = POK = GND,

BST = VL. Specifications are for TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise specified.)

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.

V+ to GND ..............................................................-0.3V to +15V

EN/HSD to GND .....................................................-0.3V to +16V

VL to GND ................................................................-0.3V to +6V

PGND to GND .......................................................-0.3V to +0.3V

VTT, DDR, POK to GND ...........................................-0.3V to +6V

REF, VTTR, DL, ILIM, FSEL to GND ................-0.3V to VL + 0.3V

LX to PGND ............................................................-0.3V to +30V

BST to GND ............................................................-0.3V to +36V

DH to LX ......................................................-0.3V to VBST + 0.3V

LX to BST..................................................................-6V to +0.3V

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

Continuous Power Dissipation (TA = +70°C)

16-Pin QSOP (derate up to +70°C)..............................667mW

16-Pin QSOP (derating above +70°C) .....................8.3mW/°C

Operating Temperature Range

Extended .........................................................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering 10s.) .................................+300°C

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

5.5

14.0

V+ Input Voltage Range

VL = V+

4.5

5.5

EN/HSD Input Voltage Range

Enabled

1.5

15.0

DDR Input Voltage Range

3.6

V+ Supply Current

VTT = 2.0V

0.8

1.2

DDR Supply Current

115

250

µA

EN/HSD Supply Current

510

µA

VL Supply Current

VL = V+ = 5.5V, VTT = 2.0V

0.8

1.2

V+ Shutdown Supply Current

EN/HSD = 0V

µA

DDR Shutdown Supply Current

EN/HSD = 0V

µA

VL Shutdown Supply Current

VL = V+ = 5.5V

µA

VL Undervoltage Lockout

Threshold

Rising edge, hysteresis = 40mV

4.05

4.25

4.40

VTT

VTT Input Bias Current

VVTT = 2.5V

-0.1

µA

VTT Feedback Voltage Range

1.8

Overload range, VDDR = 1.8V

49.5

50.5

VTT Feedback Voltage

Accuracy

Overload range, VDDR = 3.6V

49.5

50.5

%VDDR

REFERENCE

Reference Output Voltage

V+ = VL = 4.5V to 5.5V, IREF = 0

1.98

2.00

2.02

Reference Load Regulation

V+ = VL = 5V, IREF = 0 to 50µA

Reference UVLO

V+ = VL = 5V

1.5

1.6

1.7

VTTR

VTTR Output Voltage Range

1.8

IVTTR = -5mA to +5mA

49.5

50.5

IVTTR = -25mA to +25mA, VDDR = 1.8V

VTTR Output Accuracy

IVTTR = -25mA to +25mA, VDDR = 3.6V

49.5

50.5

%VDDR

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