MAX8551ETI datasheet(3/29 Pages) MAXIM

Part #	MAX8551ETI

Description	Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards

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Manufacturer	MAXIM [Maxim Integrated Products]

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Integrated DDR Power-Supply Solutions for

Desktops, Notebooks, and Graphic Cards

_______________________________________________________________________________________

3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

REFERENCE

Reference Voltage

VREF

AVDD = 4.5V to 5.5V; IREF = 0

1.98

2

2.02

V

Reference Load Regulation

IREF = 0 to 50µA

0.01

V

VREF rising

1.93

V

REF Undervoltage Lockout

Hysteresis

300

mV

FAULT DETECTION

OVP Trip Threshold

(Referred to Nominal VOUT)

UVP/OVP = AVDD (Note 4)

112

116

120

%

UVP Trip Threshold

(Referred to Nominal VOUT)

65

70

75

%

Lower level, falling edge, 1% hysteresis

87

90

93

POK1 Trip Threshold

(Referred to Nominal VOUT)

Upper level, rising edge, 1% hysteresis

107

110

113

%

Lower level, falling edge, 1% hysteresis

87.5

90

92.5

POK2 Trip Threshold

(Referred to Nominal VVTTS

and VVTTR)

Upper level, rising edge, 1% hysteresis

107.5

110

112.5

%

UVP Blanking Time

From rising edge of SHDNA

10

20

40

ms

OVP, UVP, POK_ Propagation

Delay

OVP not applicable in MAX8551

10

µs

POK_ Output Low Voltage

ISINK = 4mA

0.3

V

POK_ Leakage Current

VPOK_ = 5.5V, VFB = 0.8V, VVTTS = 1.3V

1

µA

ILIM Adjustment Range

VILIM

0.25

2.00

V

ILIM Input Leakage Current

0.1

µA

Current-Limit Threshold (Fixed)

PGND1 to LX

45

50

55

mV

Current-Limit Threshold

(Adjustable) PGND1 to LX

VILIM = 2V

170

200

235

mV

Current-Limit Threshold (Negative

Direction) PGND1 to LX

SKIP = AVDD (Note 4)

-75

-60

-45

mV

Current-Limit Threshold (Negative

Direction) PGND1 to LX

SKIP = AVDD, VILIM = 2V (Note 4)

-250

mV

Zero-Crossing Detection

Threshold PGND1 to LX

3mV

Thermal-Shutdown Threshold

+160

°C

Thermal-Shutdown Hysteresis

15

°C

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +15V, VDD = AVDD = VSHDNA = VSHDNB = VBST = VILIM = 5V, VOUT = VREFIN = VVTTI = 2.5V, UVP/OVP = STBY = FB = SKIP

= GND, PGND1 = PGND2 = LX = GND, TON = OPEN, VVTTS = VVTT, TA = -40°C to +85°C, unless otherwise noted. Typical values

are at TA = +25°C.) (Note 1)

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