Datasheet

MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
1 = PV
DD
2 = SHDN = 5V, PGND1 = PGND2 = FREQ = GND, CTLI = MAXV = MAXIP = MAXIN = REF, C
REF
= 1µF,
C
COMP
= 0.01µF, L
LX_
= 3.3µH, C
CS
= C
OS2
= 1µF, I
TEC
< 3A
RMS
(MAX1968), I
TEC
< 6A
RMS
(MAX1969), T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS MIN TYP MAX UNITS
OS1, OS2, CS Input
Current
I
OS1
,
I
OS2
, I
CS
0 or V
DD
-100 +100 µA
SHDN, FREQ Input
Current
I
SHDN
,
I
FREQ
0 or V
DD
-5 +5 µA
SHDN, FREQ Input
Low Voltage
V
IL
V
DD
= 3V to 5.5V
V
DD
x
0.25
SHDN, FREQ Input
High Voltage
V
IH
V
DD
= 3V to 5.5V
V
DD
x
0.75
V
V
MAXV
= V
REF
x 0.67, V
OS1
to V
OS2
=
±4V, V
DD
= 5V
MAXV Threshold
Accuracy
V
MAXV
= V
REF
x 0.33, V
OS1
to V
OS2
=
±2V, V
DD
= 3V
-2 +2 %
MAXV, MAXIP, MAXIN
Input Bias Current
I
MAXV-BIAS
,
I
MAXI_-BIAS
V
MAXV
= V
MAXI_
= 0.1V or 1.5V -0.1 +0.1 µA
CTLI Gain Accuracy A
CTLI
V
CTLI
= 0.5V to 2.5V (Note 3) 9.5 10.5 V/V
CTLI Input Resistance
R
CTLI
1MΩ terminated at REF 0.5 2.0 MΩ
Error-Amp
Transconductance
g
m
50 175 µA/V
ITEC Accuracy V
OS1
to V
CS
= +100mV or -100mV -10 +10 %
Note 2: Includes power FET leakage.
Note 3: CTLI Gain is defined as:
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
A
VV
VV
CTLI
CTLI REF
OS CS
=
−
−
()
1