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MAX8520/MAX8521
Smallest TEC Power Drivers for Optical
Modules
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
PV
DD1
= V
PV
DD2
= V
SHDN
= 5V, 1MHz mode (Note 4). PGND1 = PGND2 = GND, CTLI = MAXV = MAXIP = MAXIN = REF,
T
A
= -40°C to +85°C, unless otherwise noted.) (Note 8)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
V
MAXV
= V
REF
x 0.67, V
OS1
to V
OS2
= ±4V,
V
DD
= 5V
-2 +2 %
MAXV Threshold Accuracy
V
MAXV
= V
REF
x 0.33, V
OS1
to V
OS2
= ±2V,
V
DD
= 3V
-3 +3 %
MAXV, MAXI_ Input Bias Current
I
MAXV-
BIAS
,
I
MAXI_-BIAS
V
MAXV
= V
MAXI_
= 0.1V or 1.5V -0.1 +0.1 µA
CTLI Gain A
CTLI
V
CTLI
= 0.5V to 2.5V (Note 7) 9.5 10.5 V/V
CTLI Input Resistance R
CTLI
1MΩ terminated at REF 0.5 2.0 MΩ
Error-Amp Transconductance g
m
50 160 µS
V
ITEC
Accuracy
V
OS1
to V
CS
= ±100mV
V
OS1
= V
DD
/2
-10 +10 %
Note 4: Enter 1MHz mode by connecting a 60kΩ resistor from FREQ to ground for the MAX8520, and connecting FREQ to V
DD
for
the MAX8521.
Note 5: Includes power FET leakage.
Note 6: Duty-cycle specification is guaranteed by design and not production tested.
Note 7: CTLI Gain is defined as:
Note 8: Specifications to -40°C are guaranteed by design and not production tested.
A
V
VV
CTLI
CTLI
OS CS
=
−
()
∆
∆
1
Typical Operating Characteristics
(V
DD
= 5V, circuit of Figure 1, T
A
= +25°C unless otherwise noted.)
EFFICIENCY vs. TEC CURRENT
V
DD
= 5V, R
TEC
= 2Ω
MAX8520/21 toc01
TEC CURENT (A)
EFFICIENCY (%)
1.41.20.8 10.4 0.60.2
10
20
30
40
50
60
70
80
90
0
0 1.6
FREQ = 500kHz
FREQ = 1MHz
EFFICIENCY vs. TEC CURRENT
V
DD
= 3.3V, R
TEC
= 1.3Ω
MAX8520/21 toc02
TEC CURRENT (A)
EFFICIENCY (%)
1.41.20.8 10.4 0.60.2
10
20
30
40
50
60
70
80
90
0
01.6
FREQ = 500kHz
FREQ = 1MHz