MAX8521 datasheet(4/18 Pages) MAXIM

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Smallest TEC Power Drivers for Optical

Modules

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

(VDD = VPVDD1 = VPVDD2 = VSHDN = 5V, 1MHz mode (Note2). PGND1 = PGND2 = GND, CTLI = MAXV = MAXIP = MAXIN = REF,

TA = -40°C to +85°C, unless otherwise noted.) (Note 7)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

Input Supply Range

VDD

3.0

5.5

Maximum TEC Current

±1.5

Reference Voltage

VREF

VDD = 3V to 5.5V, IREF = 150µA

1.480

1.515

Reference Load Regulation

∆VREF

VDD = 3V to 5V, IREF = 10µA to 1mA

VMAXI_ = VREF

140

160

VDD = 5V

VMAXI_ = VREF/3

VMAXI_ = VREF

143

155

MAXIP/MAXIN Threshold

Accuracy

VDD = 3V

VMAXI_ = VREF/3

VDD = 5V, I = 0.2A

0.14

NFET On-Resistance

RDS(ON-N)

VDD = 3V, I = 0.2A

0.16

Ω

VDD = 5V, I = 0.2A

0.23

PFET On-Resistance

RDS(ON-P)

VDD = 3V, I = 0.2A

0.30

Ω

500kHz mode

VCOMP = VREF =

1.500V, VDD = 5V

1MHz mode

500kHz mode

No Load Supply Current

IDD(NO

LOAD)

VCOMP = VREF =

1.500V, VDD = 3.3V

1MHz mode

Shutdown Supply Current

IDD-SD

SHDN = GND, VDD = 5V, (Note 4)

VDD Rising

2.50

2.80

UVLO Threshold

VUVLO

VDD Falling

2.40

2.70

MAX8521, FREQ = VDD, VDD = 3V to 5V

0.8

1.2

MAX8521, FREQ = 0, VDD = 3V to 5V

0.4

0.6

MAX8520, REXT = 60k

Ω, VDD = 5V

0.8

1.2

MAX8520, REXT = 60k

Ω, VDD = 3V

0.76

1.10

MAX8520, REXT = 150k

Ω, VDD = 5V

0.4

0.6

Internal Oscillator Switching

Frequency

fSW-INT

MAX8520, REXT = 150k

Ω, VDD = 3V

0.36

0.56

MHz

External Sync Frequency Range

25% < duty cycle <75% (MAX8521 only)

0.7

1.2

MHz

LX_ Duty Cycle

Note 5

100

OS1, OS2, CS Input Current

IOS1, IOS2,

ICS

0 or VDD

-100

+100

µA

SHDN, FREQ Input Current

ISHDN,

IFREQ

0 or VDD, FREQ applicable for the MAX8521

only

-5

µA

SHDN, FREQ Input Low Voltage

VIL

VDD = 3V to 5.5V, FREQ applicable for the

MAX8521 only

VDD x

0.25

SHDN, FREQ Input High Voltage

VIH

VDD = 3V to 5.5V, FREQ applicable for the

MAX8521 only

VDD x

0.75

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