MAX1917EEE datasheet(4/18 Pages) MAXIM

Part #	MAX1917EEE

Description	Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies

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Manufacturer	MAXIM [Maxim Integrated Products]

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Tracking, Sinking and Sourcing, Synchronous Buck

Controller for DDR Memory and Termination Supplies

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(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.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Logic VL Level

FSEL = VL

VL - 0.4

V

EN/HSD LOGIC

EN/HSD Shutdown Current

Max IEN/HSD for VEN/HSD = 0.8V

0.5

3.0

µA

Logic High

VL = V+ = 4.5V to 5.5V, 100mV hysteresis

1.45

V

Logic Low

VL = V+ = 4.5V to 5.5V

0.8

V

POWER-OK OUTPUT

Upper VTT Threshold

110

112

114

%VDDR/

2

Lower VTT Threshold

86

88

90

%VDDR/

2

Upper VTTR Threshold

110

112

114

%VDDR/

2

Lower VTTR Threshold

86

88

90

%VDDR/

2

POK Output Low Level

ISINK = 2mA

0.4

V

POK Output High Leakage

VPOK = 5.5V

5

µA

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 = -40°C to +85°C, unless otherwise specified.) (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

5.5

14.0

V

V+ Input Voltage Range

VL = V+

4.5

5.5

V

EN/HSD Input Voltage Range

Enabled

1.5

15.0

V

DDR Input Voltage Range

0

3.6

V

V+ Supply Current

VTT = 2.0V

1.2

mA

DDR Supply Current

250

µA

EN/HSD Supply Current

VEN/HSD = 2.5V

10

µA

VL Supply Current

VL = V+ = 5.5V

1.2

mA

V+ Shutdown Supply Current

EN/HSD = 0V

5

µA

DDR Shutdown Supply Current

EN/HSD = 0V

1

µA

VL Shutdown Supply Current

VL = V+ = 5.5V

5

µA

VL Undervoltage Lockout

Threshold

Rising edge, hysteresis = 40mV

4.05

4.40

V

VTT

VTT Input Bias Current

VVTT = 2.5V

-0.15

0

µA

VTT Feedback Voltage Range

0

1.8

V

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

2.02

V

Reference Load Regulation

V+ = VL = 5V, IREF = 0 to 50µA

10

mV

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