Smallest TEC Power Drivers for Optical

Modules

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5

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX

UNITS

±4V,

-2

+2

%

MAXV Threshold Accuracy

±2V,

-3

+3

%

MAXV, MAXI_ Input Bias Current

-0.1

+0.1

µA

CTLI Gain

9.5

10.5

V/V

CTLI Input Resistance

1M

Ω terminated at REF

0.5

2.0

M

Ω

Error-Amp Transconductance

50

160

µS

±100mV

-10

+10

%

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

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.

A

V

VV

CTLI

CTLI

OS

CS

=

−

()

∆

∆

1

Typical Operating Characteristics

EFFICIENCY vs. TEC CURRENT

Ω

TEC CURENT (A)

1.4

1.2

0.8

1

0.4

0.6

0.2

10

20

30

40

50

60

70

80

90

0

0

1.6

FREQ = 500kHz

FREQ = 1MHz

EFFICIENCY vs. TEC CURRENT

Ω

TEC CURRENT (A)

1.4

1.2

0.8

1

0.4

0.6

0.2

10

20

30

40

50

60

70

80

90

0

0

1.6

FREQ = 500kHz

FREQ = 1MHz

COMMON-MODE

OUTPUT VOLTAGE RIPPLE

MAX8520/21 toc03

400ns/div

20mV/div

AC-COUPLED

20mV/div

AC-COUPLED

µF