Datasheet

MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
4 _______________________________________________________________________________________
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
= -40°C to +85°C, unless
otherwise noted.) (Note 4)
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 1.475 1.515 V
Reference Load
Regulation
ΔV
REF
V
DD
= 3V to 5.5V, I
REF
= +10µA to -1mA 5 mV
V
MAXI_
= V
REF
135 165
V
OS1
< V
CS
V
MAXI_
= V
REF
/ 3
35 65
V
MAXI_
= V
REF
135 165
Current-Sense
Threshold Accuracy
V
OS1
> V
CS
V
MAXI_
= V
REF
/ 3
35 65
mV
Switch-Fault Reset
Voltage
50 250 mV
V
DD
= 5V, I = 0.5A 0.07
NFET On-Resistance
R
DS
(
ON-N
)
V
DD
= 3V, I = 0.5A 0.08
Ω
V
DD
= 5V, I = 0.5A 0.07
PFET On-Resistance
R
DS
(
ON-P
)
V
DD
= 3V, I = 0.5A 0.12
Ω
V
LX
= V
DD
= 5V, T
A
= +25°C10
NFET Leakage
I
LEAK
(
N
)
V
LX
= V
DD
= 5V, T
A
= -40°C10
µA
V
LX
= 0, T
A
= +25°C10
PFET Leakage
I
LEAK
(
P
)
V
LX
= 0, T
A
= -40°C10
µA
V
DD
= 5V 100
No Load Supply
Current
I
DD(NO
LOAD) V
DD
= 3.3V 30
mA
Shutdown Supply
Current
I
DD-SD
SHDN = GND, V
DD
= 5V (Note 2) 3 mA
V
DD
rising 2.4 2.8
UVLO Threshold V
UVLO
V
DD
falling 2.25 2.75
V
Switching-Frequency
Internal Oscillator
f
SW-INT
FREQ = GND 400 650 kHz