Datasheet
MAX8520/MAX8521
Smallest TEC Power Drivers for Optical
Modules
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(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
Input Supply Range V
DD
3.0 5.5 V
Maximum TEC Current ±1.5 A
Reference Voltage V
REF
V
DD
= 3V to 5.5V, I
REF
= 150µA 1.480 1.515 V
Reference Load Regulation ∆V
REF
V
DD
= 3V to 5V, I
REF
= 10µA to 1mA 5 mV
V
MAXI_
= V
REF
140 160
V
DD
= 5V
V
MAXI_
= V
REF
/3 40 60
V
MAXI_
= V
REF
143 155
MAXIP/MAXIN Threshold
Accuracy
V
DD
= 3V
V
MAXI_
= V
REF
/3 45 55
mV
V
DD
= 5V, I = 0.2A 0.14
nFET On-Resistance R
DS
(
ON-N
)
V
DD
= 3V, I = 0.2A 0.16
Ω
V
DD
= 5V, I = 0.2A 0.23
pFET On-Resistance R
DS
(
ON-P
)
V
DD
= 3V, I = 0.2A 0.30
Ω
500kHz mode 14
V
COMP
= V
REF
=
1.500V, V
DD
= 5V
1MHz mode 21
500kHz mode 11
No Load Supply Current
I
DD(NO
LOAD)
V
COMP
= V
REF
=
1.500V, V
DD
= 3.3V
1MHz mode 14
mA
Shutdown Supply Current I
DD-SD
SHDN = GND, V
DD
= 5V (Note 5) 3 mA
V
DD
Rising 2.50 2.80
UVLO Threshold V
UVLO
V
DD
Falling 2.40 2.70
V
MAX8521, FREQ = V
DD
, V
DD
= 3V to 5V 0.8 1.2
MAX8521, FREQ = GND, V
DD
= 3V to 5V 0.4 0.6
MAX8520, R
EXT
= 60kΩ, V
DD
= 5V 0.8 1.2
MAX8520, R
EXT
= 60kΩ, V
DD
= 3V 0.76 1.10
MAX8520, R
EXT
= 150kΩ, V
DD
= 5V 0.4 0.6
Internal Oscillator Switching
Frequency
f
SW-INT
MAX8520, R
EXT
= 150kΩ, V
DD
= 3V 0.36 0.56
MHz
External Sync Frequency Range 25% < duty cycle < 75% (MAX8521 only) 0.7 1.2 MHz
LX_ Duty Cycle Note 6 0 100 %
OS1, OS2, CS Input Current
I
OS1
, I
OS2
,
I
CS
0V or V
DD
-100 +100 µA
SHDN, FREQ Input Current
I
SHDN
,
I
FREQ
0V or V
DD
, FREQ applicable for the
MAX8521 only
-5 +5 µA
SHDN, FREQ Input Low Voltage V
IL
V
DD
= 3V to 5.5V, FREQ applicable for the
MAX8521 only
V
DD
x
0.25
V
SHDN, FREQ Input High Voltage V
IH
V
DD
= 3V to 5.5V, FREQ applicable for the
MAX8521 only
V
DD
x
0.75
V