Datasheet LX1810 Datasheet (Microsemi)

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ThermalMax LX1810

INTEGRATED PRODUCTS

The LX1810 is a Full-Bridge
thermo-electric cooler (TEC) controller
specifically designed for high
performance opto-electronic products
where precise temperature control is
required. These products tune or
stabilize sensitive optical components
in applications that include frequency
tunable fiber optic lasers, EDFA
amplifiers, waveguides, and other
dense wavelength division multi­plexing (DWDM) components. Other
applications include microwave
transistors in new wireless base­stations.

The LX1810 uses highly efficient
(>90%) pulse width modulation
(PWM) technology, allowing the
controller to be conveniently mounted
near the TEC without adding heat

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

DESCRIPTION

to the system. The LX1810 operates on a
single voltage supply, greatly
simplifying supply requirements, with an
operating frequency that is high enough
to eliminate detrimental thermal stresses
to the TEC. The output ripple factor o
the system can be maintained well below
10% thus not effecting the performance
of delta T control.

Utilizing a full-bridge topology, the
LX1810 can be used for both heating
and cooling operations. The LX1810,
when used in conjunction with
temperature sense device, accurately
regulates TEC current levels allowing
tight control of temperature.

Fully integrated FET drivers in a 28­Pin SSOP allows the design of a fully
functional TEC controller while
minimizing board space.

VIN = 15V

PRODUCT HIGHLIGHT

ThermoElectric Cooler Drive Controller IC

KEY FEATURES

 Integrated Switching Full-Bridge

PWM Drive Architecture

 Single DC Supply Operation
 Very Low Output Noise
 Maximum Efficiency 90%
 High Output Integrated Drivers
 PSRR –70dB Typical
 Differential Input To Minimize

Noise

 External Oscillator

Synchronization

 28-Pin SSOP Package

APPLICATIONS/BENEFITS

 Peltier Effect (Thermoelectric

Coolers) Controllers

 High Efficiency H-Bridge Drive

Circuits

 RF Power Amplifier Electronic

Cooling

 CPU Electronic Cooling

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Copyright  2002
Rev. 1.0a, 10/21/2002

LX1810

R

T

Append the letter “T” to the part number. (i.e. LX1810-CDBT)

PACKAGE ORDER INFO

TA (°C)

0 to 70 LX1810-CDB

Note: Available in Tape & Reel.

DB

Plastic SSOP
28-Pin

TEC

Microsemi

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Integrated Products

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ThermalMax LX1810

INTEGRATED PRODUCTS

Supply Voltage (PVDD, VDD)....................................................................... -0.3V to 15V

SLEEP, STATUS, FBK+, FBK-...........................................................-0.3V to V

IS- ..............................................................................................PV

RPWM, CPWM, MUTE...................................................................... -0.3V to V

INPUT +, INPUT -, INAMPOUT........................................................ -0.3V to V

EAIN, EAOUT, FAOUT ..................................................................... -0.3V to V

CLOCK.................................................................................................. -0.3V to C

Operating Junction Temperature Plastic (DB Package).............................................125

Storage Temperature Range....................................................................... -65

Lead Temperature (Soldering, 10 seconds)............................................................... 300

ABSOLUTE MAXIMUM RATINGS

ThermoElectric Cooler Drive Controller IC

PACKAGE PIN OUT

–2 to PV

DD

+0.3V

DD

to +0.3V

DD

+0.3V

REF

+0.3V

REF

+0.3V

REF

+0.3V

N

O

C to 150 OC

VREF

GND

NC

V25
RPWM
CPWM

INPUT +

INPUT-

INAM POUT

O

C

O

C

SHDN

STBY

STATUS

EAIN

EAOUT

14

28

15

CLOCK
IS­CP
VDD
PVDD
P+
N+
N­P­PGND
CN
FBK­FBK+
FAOUT

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Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal

.

Plastic SSOP 28-Pin

DB

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ

Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.

THERMAL DATA

50°C/W

JA

Pin Name Description Pin Name Description

VREF

GND

NC

V25
RPWM
CPWM

INPUT+
INPUT -

INAMPOUT

SHDN

STBY

STATUS

EAIN

EAOUT

5V Reference
Low Current Ground
No Internal Connection

2.5V Reference
PWM Oscillator Timing Resistor
PWM Oscillator Timing Capacitor
Positive Differential Amplifier Input
Negative Differential Amplifier Input
Input Differential Amplifier Output
IC Shutdown Control Input (active low)
IC Standby Control Input (active high)
UVLO Indicator (Open Collector Output)
Inverting Input of Error Amplifier
Error Amplifier Output

FUNCTIONAL PIN DESCRIPTION

FAOUT

FBK+

FBK-

CN

PGND

P­N-

N+

P+

PVDD

VDD

CP
IS -

CLOCK

Feedback Amplifier Output
Feedback Amplifier Non-Inverting Input
Feedback Amplifier Inverting Input
Supply Decoupling for NFET Drivers
Output Driver High Current Ground
Drive for PFET on Negative Half of Bridge
Drive for NFET on Negative Half of Bridge
Drive for NFET on Positive Half of Bridge
Drive for PFET on Positive Half of Bridge
Output Driver Supply Voltage
Analog Supply Voltage
Supply Decoupling for PFET Drivers
Current Limit Sense Input
Input / Output Clock for Synch Operation

P

P

A

A

C

C

K

K

A

A

G

G

E

E

D

D

A

A

T

T

A

A

Copyright  2002
Rev. 1.0a, 10/21/2002

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Page 2

ThermalMax LX1810

INTEGRATED PRODUCTS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C < TA < 70°C.
Test conditions: RPWM = 49.9k, CPWM = 100pF, VDD = PVDD = 15V

ELECTRICAL CHARACTERISTICS

ThermoElectric Cooler Drive Controller IC

Parameter Symbol Test Conditions

Supply Voltage

`

Supply Voltage V
Power Supply Rejection Ratio

Oscillator Section

`

Oscillator Frequency F
Charge Current I
Discharge Current I
Oscillator Peak Voltage VPK (varies with VDD pin voltage) 3.4 V
Oscillator Valley Voltage V
Voltage Stability

Temperature Stability

Error Amplifier

`

Input Offset Voltage VIO 5 ‘mV
DC Open Loop Gain AOL 60 dB
Unity Gain Bandwidth UGBW 7 ‘mHz
High Output Voltage VOH
Low Output Voltage VOL
Input Common Mode Range
Input Bias Current IIN VIN = 1V to V

Input Amplifier

`

Stage Gain Set by Internal Resistors 3.465 3.5 3.535 V/V
Output Voltage, High V
Output Voltage, Low VOL
Input Impedance 42

Feedback Amplifier

`

Stage Gain Set by Internal Resistors 89 91 93 ‘mV/V
Input Impedance 388

Current Limit Comparator

`

Voltage Sense Threshold 190 210 230 mV
Blanking Pulse Delay 500 ‘ns
Response Time Excluding blanking pulse 250 ‘ns
IUM Pulses required to Current Limit

Latch
Consecutive Clear Pulses required
to reset I

Reference Voltage Section

`

Initial Accuracy 5.000
Voltage Stability ± 25 ± 50 ‘mV
Temperature Stability TA = 0OC to 70OC 2 5 ‘mV
T
Line Regulation VDD = 9V to 15V 0.5 ‘mV
Load Regulation I

Under voltage Lockout Section

`

Start Threshold Voltage 6.5 V
UV Lockout Hysteresis 0.5 6.5 V
UVLO Delay To Output Enable (Required Number of Clock Cycles) 62,500

counter

UM

DD

PSRR

OSC

CHG

DIS

VAL

VIN = 15V, V

335 kHz

(varies with VDD pin voltage) -110

(varies with VDD pin voltage) 110

(varies with VDD pin voltage) 1.6 V

VDD = 8V to 15V 0.6 2 %
TA = 0OC to 70OC 1.0 2 %
TA = -40OC to 125OC 1.5 %

RIPPLE

= 1V

, 10Hz to 10kHz -70 dB

RMS

= -100µA

I

OUT

= +100µA

I

OUT

1

REF

I

OH

(Required Number of Clock Cycles) 9 9 9
(Required Number of Clock Cycles) 2 2 2

= -100µA

OUT

= +100µA

I

OUT

= -40OC to 125OC 4 10 ‘mV

A

= 0 to 20mA 5 ‘mV

OUT

Copyright  2002
Rev. 1.0a, 10/21/2002

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Microsemi

Integrated Products

LX1810

Min Typ Max

7 15 V

V

–1 V

REF

50 ‘mV

3.85 V

1.3 ‘mV

Units

µA
µA

µA

‘kΩ

kΩ

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ThermalMax LX1810

INTEGRATED PRODUCTS

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C < TA < 70°C.
Test conditions: RPWM = 49.9k, CPWM = 100pF, VDD = PVDD = 15V

ELECTRICAL CHARACTERISTICS (CONT)

ThermoElectric Cooler Drive Controller IC

Parameter Symbol Test Conditions

Supply Current

`

`
`

`

Current

SHDN

Operating Current

to Output Enable

SHDN

Threshold

SHDN

1.2 1.45 1.6 V

Input = 0V, T

SHDN

Input = 2V, VIN = 15V, No MOSFETs

SHDN

= 25OC

A

connected
(Required Number of Clock Cycles) 62,500

Standby Section

Standby Threshold 1.6 1.7 1.8 V

Output Drivers for N-Channel MOSFETs

I

= 3mA 30 100 ‘mV

NFET Drivers, Low Level Voltage VOL

NFET Drivers, High Level Voltage VOH

SINK

I

= 75mA 1.5 2.0 V

SINK

I

= 3mA, CN = 5.2V applied externally 30 100 ‘mV

SOURCE

I

= 75mA, CN = 5.2V applied externally 1.5 2.0 V

SOURCE

Output Drives For P-Channel MOSFETs

I

= 3mA 30 100 ‘mV

PFET Drivers, Low Level Voltage VOL

PFET Drivers, High Level Voltage VOH

SINK

I

= 75mA 1 1.5 V

SINK

I

= 3mA, CP = 5.2V (applied externally) 30 100 ‘mV

SOURCE

I

= 75mA, CP = 5.2V (applied externally) 1 1.5 V

SOURCE

BLOCK DIAGRAM

LX1810

Min Typ Max

25

2.9 5.0 ‘mV

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Units

µA

VDD

IS-

CLOCK

RPWM

CPWM

EAOUT

EAIN

INAM POUT

INPUT -

INPUT +

STBY

25

UVLO

&

REFERENCE

FAULT
TIMER

CLK

SRQ

Q

FEEDBACK AMP

5V

Reference

5V

Reference

OUTPUT
DRIVERS

&

LOGIC

CLK

MUTE

MUTE

PVDD

+

220mV

-

CURRENT SENSE

MUX

27

28

5

6

14

13

9

8

7

11

SYNC

OSC

ERROR AMP

INPUT AMP

10

18

24

26

23

22

21

20

15

17

16

1

4

SHDN

VREF

V25

CN

PVDD

CP

P+

N+

N-

P-

FAOUT

FBK-

FBK+

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Copyright  2002
Rev. 1.0a, 10/21/2002

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

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ThermalMax LX1810

INTEGRATED PRODUCTS

DB

28-Pin Shrink Small Outline Package SSOP

ThermoElectric Cooler Drive Controller IC

NOTES

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Dim

A 1.65 1.85 0.065 0.073
B 0.25 0.38 0.009 0.015
C 0.13 0.22 0.005 0.008
D 9.90 10.50 0.390 0.413
E 5.00 5.60 0.197 0.221
F 0.65 BSC 0.025 BSC
G 0.05 0.21 0.002 0.008
H 1.73 2.00 0.068 0.078
L 0.65 0.95 0.025 0.037

M 0° 8° 0° 8°

P 7.65 7.90 0.301 0.311

*LC

*Lead Coplanarity

Note:

1. Dimensions do not include mold flash or
protrusions; these shall not exceed

0.155mm(.006”) on any side. Lead dimension
shall not include solder coverage.

MILLIMETERS INCHES

MIN MAX MIN MAX

−

0.10

−

0.004

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Copyright  2002
Rev. 1.0a, 10/21/2002

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

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ThermalMax LX1810

INTEGRATED PRODUCTS

ThermoElectric Cooler Drive Controller IC

NOTES

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Copyright  2002
Rev. 1.0a, 10/21/2002

PRODUCT PREVIEW DATA – Information contained in this document is pre-production data,
and is proprietary to Linfinity. It may not be modified in any way without the express written
consent of Linfinity. Product referred to herein is not guaranteed to achieve preview, preliminary
or production status and product specifications, configurations, and availability may change at any
time.

Microsemi

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]

Integrated Products

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