MAX8521 datasheet(7/18 Pages) MAXIM

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Smallest TEC Power Drivers for Optical

Modules

_______________________________________________________________________________________

SWITCHING FREQUENCY CHANGE vs. VDD

VDD (V)

5.0

4.5

4.0

3.5

200

400

600

800

1000

1200

3.0

5.5

FREQ = 500kHz

FREQ = 1MHz

SWITCHING FREQUENCY vs. REXT

REXT (k

Ω)

140

120

100

500

600

700

800

900

1000

1100

400

160

VDD = 3.3V

VDD = 5V

VDD STEP RESPONSE

MAX8520/21 toc19

10ms/div

VDD

2V/div

ITEC

10mA/div

REFERENCE VOLTAGE CHANGE vs. VDD

VDD (V)

5.0

4.5

4.0

3.5

-1.2

-1.0

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

-1.4

3.0

5.5

REF SOURCING 150

µA

REFERENCE VOLTAGE CHANGE

vs. TEMPERATURE

TEMPERATURE (

°C)

+80

+40

+60

+20

-20

-4

-3

-2

-1

-5

-40

REF SOURCING 150

µA

REFERENCE VOLTAGE CHANGE

vs. LOAD CURRENT

LOAD CURRENT (mA)

0.8

0.6

0.4

0.2

-10

-8

-6

-4

-2

-12

01.0

STARTUP AND SHUTDOWN WAVEFORMS

MAX8520/21 toc17

200

µs/div

VSHDN

5V/div

ITEC

500mA/div

IDD

200mA/div

0mA

CTLI STEP RESPONSE

MAX8520/21 toc18

1ms

VCTLI

1V/div

ITEC

1A/div

1.5V

Typical Operating Characteristics (continued)

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

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