Smallest TEC Power Drivers for
Optical Modules
ELECTRICAL CHARACTERISTICS (continued)
(V
= PV 1 = PV 2 = SHDN = 5V, 1MHz mode (Note 2). PGND1 = PGND2 = GND, CTLI = MAXV = MAXIP = MAXIN = REF, T
=
DD
DD
DD
A
-40°C to +85°C, unless otherwise noted.) (Note 7)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
V
V
= V
= V
x 0.67, V
to V
=
=
4V,
2V,
MAXV
REF
OS1
OS2
OS2
-2
+2
%
= 5V
DD
MAXV Threshold Accuracy
V
V
x 0.33, V
to V
MAXV
REF
OS1
-3
+3
%
= 3V
DD
I
MAXV-
MAXV, MAXI_ Input Bias Current
,
V
V
= V
= 0.1V or 1.5V
-0.1
+0.1
µA
BIAS
MAXI_-BIAS
MAXV
MAXI_
I
CTLI Gain
A
R
= 0.5V to 2.5V (Note 6)
CTLI
9.5
0.5
50
10.5
2.0
V/V
MΩ
µS
CTLI
CTLI
CTLI Input Resistance
Error-Amp Transconductance
1MΩ terminated at REF
g
160
+10
m
V
Accuracy
V
to V 100mV, V
=
= V /2
-10
%
ITEC
OS1
CS
OS1
DD
Note 3: Enter 1MHz mode by tying a 60kΩ resistor from FREQ to ground for the MAX8520, and tying FREQ to V
Note 4: Includes PFET leakage.
for the MAX8521.
DD
Note 5: Duty-cycle specification is guaranteed by design and not production tested.
Note 6: CTLI Gain is defined as:
∆V
CTLI
− V
CS
A
=
CTLI
∆ V
(
)
OS1
Note 7: Specifications to -40°C are guaranteed by design and not production tested.
Typical Operating Characteristics
(V
DD
= 5V, circuit of Figure 1, T = +25°C, unless otherwise noted)
A
EFFICIENCY vs. TEC CURRENT
COMMON-MODE
OUTPUT VOLTAGE RIPPLE
EFFICIENCY vs. TEC CURRENT
(V = 3.3V, R
= 1.3Ω)
(V = 5V, R
DD
= 2Ω)
DD
TEC
TEC
MAX8520/21 toc03
90
80
70
60
50
40
30
20
10
0
90
FREQ = 500kHz
80
70
60
50
40
30
20
10
0
C = C = 1µF
2
7
FREQ = 500kHz
FREQ = 1MHz
V
OS2
FREQ = 1MHz
20mV/div
AC-COUPLED
V
OS1
20mV/div
AC-COUPLED
I
= 1A
TEC
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
TEC CURRENT (A)
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
TEC CURENT (A)
400ns/div
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
