Datasheet

MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
1 = PV
DD
2 = SHDN = 5V, PGND1 = PGND2 = FREQ = GND, CTLI = MAXV = MAXIP = MAXIN = REF, C
REF
= 1µF,
C
COMP
= 0.1µF, L
LX_
= 3.3µH, C
CS
= C
OS2
= 1µF, I
TEC
< 3A
RMS
(MAX1968), I
TEC
< 6A
RMS
(MAX1969), T
A
= 0°C to +85°C, unless
otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND..............................................................-0.3V to +6V
SHDN, MAXV, MAXIP, MAXIN, CTLI,
FREQ to GND .......................................................-0.3V to +6V
COMP, OS1, OS2, CS, REF,
ITEC to GND...........................................-0.3V to (V
DD
+ 0.3V)
PV
DD
1, PV
DD
2 to GND ...............................-0.3V to (V
DD
+ 0.3V)
PV
DD
1, PV
DD
2 to V
DD ..................................................
-0.3V to +0.3V
PGND1, PGND2 to GND .......................................-0.3V to +0.3V
COMP, REF, ITEC Short to GND ...................................Indefinite
Peak LX Current (MAX1968) (Note 1).................................±4.5A
Peak LX Current (MAX1969) (Note 1)....................................+9A
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TSSOP-EP (derate 23.8mW/°C above +70°C).....1.9W
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering 10s) ..................................+300°C
PARAMETER
SYMBOL
CONDITIONS MIN TYP MAX UNITS
Input Supply Range V
DD
3.0 5.5 V
V
DD
= 5V, I
TEC
= 0 to ±3A,
V
OUT
= V
OS1
- V
OS2
(MAX1968)
-4.3 +4.3
V
DD
= 5V, I
TEC
= 0 to 6A,
V
OUT
= V
OS1
(MAX1969)
4.3
V
DD
= 3V, I
TEC
= 0 to ±3A,
V
OUT
= V
OS1
- V
OS2
(MAX1968)
-2.3 +2.3
Output Voltage Range
V
OUT
V
DD
= 3V, I
TEC
= 0 to 6A,
V
OUT
= V
OS1
(MAX1969)
2.3
V
MAX1968 ±3
Maximum TEC
Current
I
TEC
(
MAX
)
MAX1969 6
A
Reference Voltage V
REF
V
DD
= 3V to 5.5V, I
REF
= 150µA 1.485 1.500 1.515 V
Reference Load
Regulation
ΔV
REF
V
DD
= 3V to 5.5V, I
REF
= +10µA to -1mA 1.2 5 mV
V
MAXI_
= V
REF
140 150 160
V
OS1
< V
CS
V
MAXI_
= V
REF
/3
40 50 60
V
MAXI_
= V
REF
140 150 160
Current-Sense
Threshold Accuracy
V
OS1
> V
CS
V
MAXI_
= V
REF
/3
40 50 60
mV
Switch-Fault Reset
Voltage
50 150 250 mV
V
DD
= 5V, I = 0.5A 0.04 0.07
NFET On-Resistance
R
DS
(
ON-N
)
V
DD
= 3V, I = 0.5A 0.06 0.08
Ω
V
DD
= 5V, I = 0.5A 0.06 0.10
PFET On-Resistance
R
DS
(
ON-P
)
V
DD
= 3V, I = 0.5A 0.09 0.12
Ω
V
LX
= V
DD
= 5V, T
A
= +25°C 0.02 10
NFET Leakage
I
LEAK
(
N
)
V
LX
= V
DD
= 5V, T
A
= +85°C 1
µA
Note 1: LX has internal clamp diodes to PGND and PV
DD_
. Applications that forward bias these diodes should take care not to
exceed the IC’s package power dissipation limits.