Smallest TEC Power Drivers for
Optical Modules
ELECTRICAL CHARACTERISTICS
(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
Input Supply Range
CONDITIONS
MIN
3.0
MAX
UNITS
V
5.5
V
A
V
DD
Maximum TEC Current
Reference Voltage
1.5
V
V
V
= 3V to 5.5V, I = 150µA
REF
1.480
1.515
5
REF
DD
DD
Reference Load Regulation
∆V
= 3V to 5V, I = 10µA to 1mA
REF
mV
REF
V
V
V
V
= V
= V
= V
= V
140
40
160
60
MAXI_
MAXI_
MAXI_
MAXI_
REF
REF
REF
REF
V
V
= 5V
DD
DD
/3
/3
MAXIP/MAXIN Threshold
Accuracy
mV
143
45
155
55
= 3V
V
V
V
V
V
= 5V, I = 0.2A
= 3V, I = 0.2A
= 5V, I = 0.2A
= 3V, I = 0.2A
0.14
0.16
0.23
0.30
14
DD
NFET On-Resistance
PFET On-Resistance
R
R
Ω
Ω
DS(ON-N)
DD
DD
DS(ON-P)
DD
500kHz mode
1MHz mode
500kHz mode
1MHz mode
= V
=
REF
COMP
1.500V, V = 5V
DD
21
I
DD(NO
LOAD)
No-Load Supply Current
mA
11
V
= V
=
REF
COMP
1.500V, V = 3.3V
DD
14
Shutdown Supply Current
UVLO Threshold
I
SHDN = GND, V = 5V (Note 4)
3
mA
V
DD-SD
DD
V
V
rising
falling
2.50
2.40
0.8
0.4
0.8
0.76
0.4
0.36
0.7
0
2.80
2.70
1.2
0.6
1.2
1.10
0.6
0.56
1.2
100
DD
DD
V
UVLO
MAX8521, FREQ = V , V = 3V to 5V
DD DD
MAX8521, FREQ = 0, V = 3V to 5V
DD
MAX8520, R
MAX8520, R
MAX8520, R
MAX8520, R
= 60kΩ, V = 5V
DD
EXT
EXT
EXT
EXT
Internal Oscillator Switching
Frequency
f
MHz
SW-INT
= 60kΩ, V = 3V
DD
= 150kΩ, V = 5V
DD
= 150kΩ, V = 3V
DD
External Sync Frequency Range
LX_ Duty Cycle
25% < duty cycle <75% (MAX8521 only)
(Note 5)
MHz
%
I
, I
,
OS1 OS2
OS1, OS2, CS Input Current
SHDN, FREQ Input Current
0 or V
-100
-5
+100
+5
µA
µA
V
DD
I
CS
I
,
0 or V , FREQ applicable for the MAX8521
DD
only
SHDN
I
FREQ
V
= 3V to 5.5V, FREQ applicable for the
V
x
DD
DD
SHDN, FREQ Input Low Voltage
SHDN, FREQ Input High Voltage
V
IL
MAX8521 only
0.25
V
= 3V to 5.5V, FREQ applicable for the
V
x
DD
DD
V
V
IH
MAX8521 only
0.75
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
