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LTC1923EGN#PBF

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1
LTC1923
1923f
High Efficiency Thermoelectric
Cooler Controller
■
High Efficiency, Low Noise Topology
■
Adjustable Output Slew Rate Reduces EMI
■
Full-Bridge Controller for Bidirectional
Current Control
■
Adjustable Pulse-by-Pulse Bidirectional TEC
Current Limit
■
Open/Shorted Thermistor Indication
■
Solution Footprint in Less Than 0.6" × 0.8"
(Double-Sided PCB)
■
Available in 5mm x 5mm QFN and
28-Pin SSOP Packages
■
TEC Voltage Clamping
■
TEC Current, Voltage and Heat/Cool Status Outputs
■
Adjustable/Synchronizable Oscillator Frequency
Reduces Filter Component Size and System Noise
■
2.5V Reference Voltage Output
■
2.7V Minimum Operating Voltage
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Laser-Based Fiber Optic Links
■
Medical Instruments
■
CPU Temperature Regulators
Laser Temperature Control Loop Achieving Setpoint Stability of 0.01°C
The LTC
®
1923 is a pulse width modulator intended for
thermoelectric cooler (TEC) or heater applications requir-
ing either unidirectional or bidirectional drive circuits. All
of the necessary control circuitry and two sets of comple-
mentary output drivers are integrated into the LTC1923 to
drive a full bridge, providing an efficient means of bidirec-
tional current flow to the TEC. An accurate temperature
control loop to stabilize the temperature of a laser diode
system is easily achieved with the addition of just a few
external components. Typical temperature setpoint accu-
racy of 0.1°C is achievable with the LTC1923. Adding an
instrumentation amplifier front end allows setpoint stabil-
ity of 0.01°C.
The part features independent adjustable heating and
cooling pulse-by-pulse current limit, current soft-start for
controlled start-up, output slew rate control to reduce
system noise, differential current sense and voltage am-
plifiers and a host of auxiliary circuits to protect the laser
and provide redundant system monitoring.
4
3
2
1
PLLLPF
R
SLEW
SDSYNC
CNTRL
EAOUT
FB
AGND
SS
I
LIM
V
SET
FAULT
V
THRM
H/C
V
TEC
R
T
C
T
V
REF
PDRVB
NDRVB
V
DD
PGND
NDRVA
PDRVA
CS
+
CS
–
I
TEC
TEC
+
TEC
–
LTC1923
V
DD
–
+
LTC2053
A = 10
REF
LTC1658
REF
10k
0.1%
10k
NTC
V
OUT
TMP
CMD
330pF
1µF
10µF
L1
10µH
V
DD
R
S
C1, C2: TAIYO YUDEN JMK325BJ226MM-T (X7R)
L1, L2: SUMIDA CDRH6D2B-220NC
*MNA, MPA: SILICONIX Si9801
**MNB, MPB: SILICONIX Si9801
1923 TA01
4.7µF
1µF
10M
100k
10k
1µF
L2
10µH
C1
22µF
C2
22µF
MPA*
V
REF
MPB**
MNA*
MNB**
TEC
COOLER
82k
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
2
LTC1923
1923f
V
DD
to GND................................................. –0.3V to 6V
SDSYNC, R
SLEW
......................................... –0.3V to 6V
FB, CNTRL, V
THRM
, I
LIM
, V
SET
..................... –0.3V to 6V
CS
+
, CS
–
, TEC
+
, TEC
–
.................................–0.3V to 6V
ORDER PART
NUMBER
LTC1923EGN
T
JMAX
= 125°C, θ
JA
= 120°C/W
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
DD
= 5V, R
SLEW
= V
DD
, SDSYNC = V
DD
, R
T
= 10k, C
T
= 330pF unless otherwise noted.
ELECTRICAL CHARACTERISTICS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PLLLPF
R
SLEW
SDSYNC
CNTRL
EAOUT
FB
AGND
SS
I
LIM
V
SET
FAULT
V
THRM
H/C
V
TEC
R
T
C
T
V
REF
PDRVB
NDRVB
V
DD
PGND
NDRVA
PDRVA
CS
+
CS
–
I
TEC
TEC
+
TEC
–
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Note 1)
FAULT, H/C ................................................. –0.3V to 6V
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec)..................300°C
ORDER PART
NUMBER
LTC1923EUH
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1CNTRL
EAOUT
FB
AGND
NC
SS
I
LIM
V
SET
PDRVB
NDRVB
V
DD
V
DD
PGND
NDRVA
PDRVA
CS
+
SDSYNC
R
SLEW
PLLLPF
R
T
C
T
V
REF
NC
NC
FAULT
V
THRM
H/C
V
TEC
TEC
–
TEC
+
I
TEC
CS
–
UH PACKAGE
32-LEAD PLASTIC QFN
PIN 1
TOP VIEW
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD IS PGND
(MUST BE SOLDERED TO PCB)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply
VDD Operating Supply Voltage ● 2.7 5.5 V
UVLO Undervoltage Lockout Low to High Threshold ● 2.6 2.7 V
UVHYST Hysteresis High to Low ● 50 130 mV
I
DD
Operating Supply Current No Output Load, Outputs Not Switching 2 4 mA
I
DDSHDN
Shutdown I
DD
SDSYNC = 0V 10 25 µA
SHDNTH Shutdown Threshold Measured at PDRVA, PDRVB 0.3 0.8 1.4 V
3
LTC1923
1923f
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
DD
= 5V, R
SLEW
= V
DD
, SDSYNC = V
DD
, R
T
= 10k, C
T
= 330pF unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference
V
REF
Reference Output Voltage No Load 2.462 2.5 2.538 V
● 2.450 2.550 V
V
REFGD
V
REF
Good Threshold V
REF
Rising Threshold ● 2.25 2.45 V
LDREG Load Regulation I
LOAD
= –1mA to –10mA 10 25 mV
LINEREG Line Regulation V
DD
= 2.7V to 5.5V 5 20 mV
V
REFISC
Short-Circuit Current V
REF
= 0V 10 20 mA
Oscillator and Phase-Locked Loop
f
OSCI
Initial Oscillator Frequency R
T
= 10k, C
T
= 330pF 190 225 260 kHz
f
OSC
Frequency Variation V
DD
= 2.7V to 5V, C
T
= 330pF, R
T
= 10k ● 165 225 270 kHz
OSCPK C
T
Ramp Peak 1.4 1.5 1.6 V
OSCVLY C
T
Ramp Valley 0.4 0.5 0.6 V
C
TICH
C
T
Charge Current C
T
= 0.3V, R
T
= 10k –150 µA
C
TIDIS
C
T
Discharge Current C
T
= 1.8V, R
T
= 10k 150 µA
PLLGAIN Gain from PLLLPF to R
T
–1.1 –0.9 –0.7 V/V
I
PLLLPF
Phase Detector Output Current
Sinking f
SYNC
< f
OSC
12 µA
Sourcing f
SYNC
> f
OSC
–12 µA
MSTTH Master Threshold On PLLLPF Pin Measured at SDSYNC Pin V
DD
– 0.7 V
DD
– 0.4 V
SDDLY Shutdown Delay to Output 20 45 µs
Error Amplifier
V
OS
Input Offset Voltage EAOUT = 1V, V
CM
= 2.5V –18 18 mV
AOL Open-Loop Gain EAOUT = 0.45V to 1.55V, CNTRL = 2.5V 80 dB
V
CM
Common Mode Input Range EAOUT = 1V 0.2 V
DD
+ 0.2 V
I
IB
FB and CNTRL Input Bias Currents FB = CNTRL = 1.25 –100 100 nA
V
OH
Output High I
LOAD
= –100µA 1.65 V
V
OL
Output Low I
LOAD
= 100µA 0.3 0.45 V
I
SOURCE
Sourcing Current EAOUT = 1V, FB = 2.4V, CNTRL = 2.5V –1.5 –0.5 mA
I
SINK
Sinking Current EAOUT = 1V, FB = 5V, CNTRL = 2.5V 1 2 mA
GBW Gain-Bandwidth Product f = 100kHz (Note 3) 2 MHz
Current Sense Amplifier
ACS Amplifier Gain 10 V/V
CSOFF Amplifier Offset Measured at I
TEC
–15 –2 10 mV
I
TECH
Output Sourcing Load Regulation CS
+
- CS
–
= 100mV, I
LOAD
= 0 to –50µA 0.1 0.2 V
I
TECL
Output Sinking Load Regulation CS
+
- CS
–
= 100mV, I
LOAD
= 0 to 50µA 0.1 0.2 V
f3dB –3dB Frequency (Note 3) 500 kHz
I
LIMTH
Current Limit Threshold Measured at CS
+
, CS
–
● 125 145 165 mV
I
LIMDLY
Current Limit Delay to Output 300 450 ns
SSI
CHG
Soft-Start Charge Current SS = 0.75V –2.5 –1.5 –0.5 µA
SSI
LIM
Soft-Start Current Limit Threshold SS = 0.5V, Measured at CS
+
, CS
–
50 70 90 mV
I
LIM
I
LIM
Current Limit Threshold I
LIM
= 0.5V, Measured at CS
+
, CS
–
50 70 90 mV
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LTC1923EGN#PBF

Mfr. #:
Buy LTC1923EGN#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC Hi Eff Thermoelectric Cooler Cntr
Lifecycle:
New from this manufacturer.
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