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MAX1968EUI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
EVALUATION KIT AVAILABLE
General Description
The MAX1968/MAX1969 are highly integrated and cost-
effective, high-efficiency, switch-mode drivers for Peltier
thermoelectric cooler (TEC) modules. Both devices
utilize direct current control to eliminate current surges
in the TEC. On-chip FETs minimize external components
while providing high efficiency. A 500kHz/1MHz switch-
ing frequency and a unique ripple cancellation scheme
reduce component size and noise.
The MAX1968 operates from a single supply and pro-
vides bipolar ±3A output by biasing the TEC between
the outputs of two synchronous buck regulators.
Bipolar operation allows for temperature control without
“dead zones” or other nonlinearities at low load
currents. This arrangement ensures that the control
system does not hunt when the set point is very close
to the natural operating point, requiring a small amount
of heating or cooling. An analog control signal precisely
sets the TEC current. The MAX1969 provides unipolar
output up to 6A. Reliability is optimized with settable
limits for both TEC voltage and current, with indepen-
dently set limits for heating and cooling current. An
analog output also monitors TEC current.
The MAX1968/MAX1969 are available in a low-profile
28-pin TSSOP-EP package and is specified over the
-40°C to +85°C temperature range. The thermally
enhanced TSSOP-EP package with exposed metal pad
minimizes operating junction temperature. An evalua-
tion kit is available to speed designs.
Applications
Fiber Optic Laser Modules
WDM, DWDM Laser Diode Temperature Control
Fiber Optic Network Equipment
EDFA Optical Amplifiers
Telecom Fiber Interfaces
ATE
Biotech Lab Equipment
Benefits and Features
• High Accuracy and Adjustability Improves System
Performance by Optimizing TEC Operation
• Direct Current Control Prevents TEC Current Surges
• Ripple Cancellation for Low Noise
• No Dead-Zone or Hunting at Low-Output Current
• 1% Accurate Voltage Reference
• Adjustable TEC Voltage Limit
• Separately Adjustable Heating and Cooling Current
Limits
• ITEC Output Provides Proportional Voltage to TEC
Current for Monitoring
• High-Efficiency Switch-Mode Design
• On-Chip Power MOSFETs Improve Efficiency While
Reducing External Components
• 500kHz/1MHz Switching Frequency
• Choose from ±3A Output Current (MAX1968) or 6A
Output Current (MAX1969)
• Thermally Enhanced TSSOP-EP Package Minimizes
Operating Junction Temperature
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX1968EUI -40°C to +85°C 28 TSSOP-EP*
MAX1969EUI -40°C to +85°C 28 TSSOP-EP*
Typical Operating Circuit
PGND1
PGND2
CTLI
COMP
LX2
LX1
GND
V
DD
MAX1968
PV
DD
1PV
DD
2
OS1 CSOS2
TEC
3V TO
5.5V
TEC
CURRENT-
CONTROL
SIGNAL
Pin Configuration and Functional Diagram appear at end
of data sheet.
*
EP = Exposed pad.
19-2447; Rev 3; 5/15
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
Maxim Integrated | 2www.maximintegrated.com
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.
MAX1968/MAX1969
Power Drivers for Peltier TEC Modules
Maxim Integrated | 3www.maximintegrated.com
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
= 0°C to +85°C, unless
otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
LX
= 0, T
A
= +25°C 0.02 10
V
LX
= 0, T
A
= +85°C 1
PFET Leakage I
LEAK
(
P
)
µA
V
DD
= 5V 32 100
No Load Supply
Current
I
DD
(
NO LOAD
)
V
DD
= 3.3V 20 30
mA
Shutdown Supply
Current
I
DD-SD
V
DD
= 5V (Note 2) 2 3 mA
Thermal Shutdown T
SHUTDOWN
Hysteresis = 15°C +165 °C
V
DD
rising 2.4 2.6 2.8
UVLO Threshold V
UVLO
V
DD
falling 2.25 2.5 2.75
V
Switching Frequency
Internal Oscillator
f
SW-INT
FREQ = GND 400 550 650 kHz
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
V
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
-2 +2 %
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 10.5 V/V
CTLI Input Resistance R
CTLI
1MΩ terminated at REF 0.5 1.0 2.0 MΩ
Error-Amp
Transconductance
g
m
50 100 175 µA/V
ITEC Accuracy V
OS1
to V
CS
= +100mV or -100mV -10 +10 %
ITEC Load Regulation ΔV
ITEC
V
OS1
to V
CS
= +100mV or -100mV,
I
ITEC
= ±10µA
-0.1 +0.1 %
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX1968EUI+

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Manufacturer:
Maxim Integrated
Description:
Gate Drivers Power Driver for Peltier TEC Modules
Lifecycle:
New from this manufacturer.
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