MAX1978ETM Maxim Integrated Products, MAX1978ETM Datasheet - Page 9

• Manufacturer Part Number: MAX1978ETM
• Description: Other Power Management
• Manufacturer: Maxim Integrated Products

Specifications of MAX1978ETM

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TEMPERATURE
0.001°C/div
(V
26, 42, 43
2, 8, 29,
DD
16, 25,
4, 6, 9
7, 10
PIN
3, 5
35
11
12
13
14
15
17
18
19
20
21
22
1
= 5V, V
I
T
TEC
A
= +25°C
CTLI
INTOUT Integrator Amp Output. Normally connected to CTLI.
DIFOUT Chopper-Stabilized Instrumentation Amp Output. Differential gain is 50
PGND2
= +25°C
PV
NAME
SHDN
BFB+
AIN+
ROOM TEMPERATURE
GND
BFB-
THERMAL STABILITY,
N.C.
OS2
INT-
FB+
LX2
FB-
OT
UT
DD
= 1V, V
2
_______________________________________________________________________________________
4s/div
Output Sense 2. OS2 senses one side of the differential TEC voltage. OS2 is a sense point, not a power
output.
Not Internally Connected
Power Ground 2. Internal synchronous rectifier ground connections. Connect all PGND pins together at
power ground plane.
Inductor 2 Connection. Connect all LX2 pins together. Connect LX2 to LX1 when using the MAX1979.
Power 2 Inputs. Must be same voltage as V
Bypass to PGND2 with a 10µF ceramic capacitor.
Shutdown Control Input. Active-low shutdown control.
Over-Temperature Alarm. Open-drain output pulls low if temperature feedback rises 20mV
(typically +1.5°C) above the set-point voltage.
Under-Temperature Alarm. Open-drain output pulls low if temperature feedback falls 20mV
(typically +1.5°C) below the set-point voltage.
Integrator Amp Inverting Input. Normally connected to DIFOUT through thermal-compensation network.
Analog Ground. Connect all GND pins to analog ground plane.
Chopper-Stabilized Instrumentation Amp Inverting Input. Connect to thermistor bridge.
Chopper-Stabilized Instrumentation Amp Noninverting Input. Connect to thermistor bridge.
Chopper-Stabilized Buffered FB- Output. Used to monitor thermistor bridge voltage.
Chopper-Stabilized Buffered FB+ Output. Used to monitor thermistor bridge voltage.
Undedicated Chopper-Stabilized Amplifier Noninverting Input
FREQ
= GND, RTEC = 1Ω, circuit of Figure 1, T
TEMPERATURE
0.001°C/div
Controllers for Peltier Modules
Typical Operating Characteristics (continued)
T
T
TEC
A
= +5°C
= +25°C
THERMAL STABILITY,
HEATING MODE
DD
Integrated Temperature
. Connect all PV
4s/div
A
FUNCTION
= +25°C, unless otherwise noted.)
DD
2 inputs together at the V
-0.01
-0.02
-0.03
✕
0.03
0.02
0.01
(FB+ - FB-).
0
-20
-10
vs. AMBIENT TEMPERATURE
AMBIENT TEMPERATURE (°C)
Pin Description
TEMPERATURE ERROR
0
10
DD
power plane.
20
30
40
50
9