MAX8521 datasheet(5/18 Pages) MAXIM

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Smallest TEC Power Drivers for Optical

Modules

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(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

VMAXV = VREF x 0.67, VOS1 to VOS2 =

±4V,

VDD = 5V

-2

MAXV Threshold Accuracy

VMAXV = VREF x 0.33, VOS1 to VOS2 =

±2V,

VDD = 3V

-3

MAXV, MAXI_ Input Bias Current

IMAXV-

BIAS,

IMAXI_-BIAS

VMAXV = VMAXI_ = 0.1V or 1.5V

-0.1

+0.1

µA

CTLI Gain

ACTLI

VCTLI = 0.5V to 2.5V (Note 6)

9.5

10.5

V/V

CTLI Input Resistance

RCTLI

Ω terminated at REF

0.5

2.0

Ω

Error-Amp Transconductance

160

µS

VITEC Accuracy

VOS1 to VCS =

±100mV

VOS1 = VDD /2

-10

+10

Note 3: Enter 1MHz mode by connecting a 60k

Ω resistor from FREQ to ground for the MAX8520, and connecting FREQ to VDD for

the MAX8521.

Note 4: Includes power FET leakage.

Note 5: Duty-cycle specification is guaranteed by design and not production tested.

Note 6: CTLI Gain is defined as:

Note 7: Specifications to -40°C are guaranteed by design and not production tested.

CTLI

−

()

∆

Typical Operating Characteristics

(VDD = 5V, circuit of Figure 1, TA = +25°C unless otherwise noted)

EFFICIENCY vs. TEC CURRENT

VDD = 5V, RTEC = 2

Ω

TEC CURENT (A)

1.4

1.2

0.8

0.4

0.6

0.2

1.6

FREQ = 500kHz

FREQ = 1MHz

EFFICIENCY vs. TEC CURRENT

VDD = 3.3V, RTEC = 1.3

Ω

TEC CURRENT (A)

1.4

1.2

0.8

0.4

0.6

0.2

1.6

FREQ = 500kHz

FREQ = 1MHz

COMMON-MODE

OUTPUT VOLTAGE RIPPLE

MAX8520/21 toc03

400ns/div

VOS2

20mV/div

AC-COUPLED

VOS1

20mV/div

AC-COUPLED

ITEC = 1A

C2 = C7 = 1

µF

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