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MAX8520ETP+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
MAX8520/MAX8521
Smallest TEC Power Drivers for Optical
Modules
_______________________________________________________________________________________
7
SWITCHING FREQUENCY CHANGE vs. V
DD
MAX8520/21 toc12
V
DD
(V)
SWITCHING FREQUENCY CHANGE (kHz)
5.04.54.03.5
200
400
600
800
1000
1200
0
3.0 5.5
FREQ = 500kHz
FREQ = 1MHz
SWITCHING FREQUENCY vs. R
EXT
MAX8520/21 toc13
R
EXT
(kΩ)
SWITCHING FREQUENCY (kHz)
14012010080
500
600
700
800
900
1000
1100
400
60 160
V
DD
= 3.3V
V
DD
= 5V
V
DD
STEP RESPONSE
MAX8520/21 toc19
10ms/div
V
DD
2V/div
I
TEC
10mA/div
1A
0V
REFERENCE VOLTAGE CHANGE vs. V
DD
MAX8520/21 toc14
V
DD
(V)
REFERENCE VOLTAGE CHANGE (mV)
5.04.54.03.5
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
-1.4
3.0 5.5
REF SOURCING 150µA
REFERENCE VOLTAGE CHANGE
vs. TEMPERATURE
MAX8520/21 toc15
TEMPERATURE (°C)
REFERENCE VOLTAGE CHANGE (mV)
+80+40 +600 +20-20
-4
-3
-2
-1
0
1
2
3
4
5
-5
-40
REF SOURCING 150µA
REFERENCE VOLTAGE CHANGE
vs. LOAD CURRENT
MAX8520/21 toc16
LOAD CURRENT (mA)
REFERENCE VOLTAGE CHANGE (mV)
0.80.60.40.2
-10
-8
-6
-4
-2
0
-12
01.0
STARTUP AND SHUTDOWN WAVEFORMS
MAX8520/21 toc17
200µs/div
V
SHDN
5V/div
I
TEC
500mA/div
I
DD
200mA/div
0mA
0mA
0V
CTLI STEP RESPONSE
MAX8520/21 toc18
1ms
V
CTLI
1V/div
I
TEC
1A/div
0A
1.5V
Typical Operating Characteristics (continued)
(V
DD
= 5V, circuit of Figure 1, T
A
= +25°C unless otherwise noted.)
MAX8520/MAX8521
Smallest TEC Power Drivers for Optical
Modules
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
DD
= 5V, circuit of Figure 1, T
A
= +25°C unless otherwise noted.)
THERMAL STABILITY,
COOLING MODE
MAX8520/21 toc20
4s/div
TEMPERATURE
0.001°C/div
T
TEC
= +25°C
T
A
= +45°C
THERMAL STABILITY,
ROOM TEMPERATURE
MAX8520/21 toc21
4s/div
TEMPERATURE
0.001°C/div
T
TEC
= +25°C
T
A
= +25°C
THERMAL STABILITY,
HEATING MODE
MAX8520/21 toc22
4s/div
TEMPERATURE
0.001°C/div
T
TEC
= +25°C
T
A
= +5°C
Pin Description
PIN
TQFN UCSP/WLP
NAME
FUNCTION
1 E1, E2 LX1 Inductor Connection. LX1 is high-impedance in shutdown.
2 D1, D2, D3 PGND1
Power Ground 1. Internal synchronous-rectifier ground connection. Connect all PGND
pins together at power ground plane.
3C1SHDN Shutdown Control Input. Pull SHDN low to turn off PWM control and ITEC output.
4 C2 COMP Current-Control Loop Compensation. See the Compensation Capacitor section.
5 B1 ITEC
TEC Current-Monitor Output. The ITEC output voltage is a function of the voltage across
the TEC current-sense resistor. V
ITEC
= V
REF
+ 8 (V
OS
- V
CS
). Keep capacitance on ITEC
< 150pF.
6 A1 MAXIN
Maximum Negative TEC Current. Connect MAXIN to REF to set default negative current
limit to - 150mV/R
SENSE
. To lower this current limit, connect MAXIN to a resistor-divider
network from REF to GND. The current limit will then be equal to -(V
MAXIN
/V
REF
) x
(150mV/R
SENSE
).
7 A2 MAXIP
Maximum Positive TEC Current. Connect MAXIP to REF to set default positive current limit
to 150mV/R
SENSE
. To lower this current limit, connect MAXIP to a resistor-divider network
from REF to GND. The current limit will then be equal to (V
MAXIP
/V
REF
) x (150mV/R
SENSE
).
8 A3 MAXV
Maximum Bipolar TEC Voltage. Connect MAXV to REF to set default maximum TEC
voltage to V
DD
. To lower this limit, connect MAXV to a resistor-divider network from REF to
GND. The maximum TEC voltage is equal to 4 x V
MAXV
or V
DD
, whichever is lower.
9 A4 REF 1.50V Reference Output. Bypass REF to GND with a 0.1µF ceramic capacitor.
MAX8520/MAX8521
Smallest TEC Power Drivers for Optical
Modules
_______________________________________________________________________________________ 9
PIN
TQFN UCSP/WLP
NAME
FUNCTION
10 A5 CTLI
TEC Current-Control Input. Sets TEC current. Center point is 1.50V (no TEC current). The
current is given by:
I
TEC
= (V
OS1
- V
CS
) / R
SENSE
= (V
CTLI
- 1.50) / (10 x R
SENSE
). When (V
CTLI
- V
REF
) > 0V
then V
OS2
> V
OS1
> V
CS
.
11 A6 GND Analog Ground. Star connect to PGND at underside exposed pad for TQFN package.
12 B6 V
DD
Analog Supply Voltage Input. Bypass V
DD
to GND with a 1µF ceramic capacitor.
For MAX8520: Analog FREQ Set Pin (see the Switching Frequency section).
13 C5 FREQ
For MAX8521: Digital FREQ Selection Pin. Connect to V
DD
for 1MHz operation, connect to
GND for 500kHz operation. The PWM oscillator can synchronize to FREQ by switching at
FREQ between 700kHz and 1.2MHz.
14 D6, D5, D4 PGND2
Power Ground 2. Internal synchronous rectifier ground connection. Connect all PGND
pins together at the power ground plane.
15 E5, E6 LX2 Inductor Connection. LX2 is high-impedance in shutdown.
16 F5, F6 PVDD2 Power Input 2. Connect all PVDD inputs together at the V
DD
power plane.
17 F4 CS
Current-Sense Input. The current through the TEC is monitored between CS and OS1. The
maximum TEC current is given by 150mV/R
SENSE
and is bipolar.
18 C6 OS2
Output Sense 2. OS2 senses one side of the differential TEC voltage. OS2 is a sense
point, not a power output. OS2 discharges to ground in shutdown.
19 F3 OS1
Output Sense 1. OS1 senses one side of the differential TEC voltage. OS1 is a sense
point, not a power output. OS1 discharges to ground in shutdown.
20 F1, F2 PVDD1 Power Input 1. Connect all PVDD inputs together at the V
DD
power plane.
B2, B5, C3,
C4
GND2
Ground. Additional ground pads aid in heat dissipation. Short to either GND or PGND
plane.
B3, B4
E3, E4
N.C. No Connect. Connect N.C. pads to GND2 to aid in heat dissipation.
——EP
Exposed Paddle (TQFN Only). Internally connected to GND. Connect to a large ground
plane to maximize thermal performance. Not intended as an electrical connection point.
Pin Description (continued)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX8520ETP+T

Mfr. #:
Buy MAX8520ETP+T
Manufacturer:
Maxim Integrated
Description:
Power Management Specialized - PMIC TEC Power Driver for Optical Modules
Lifecycle:
New from this manufacturer.
Delivery:
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