SLM8834
Ultracompact, 1.5 A Thermoelectric Cooler (TEC) Controller
GENERAL DESCRIPTION
The SLM8834 is a monolithic TEC controller with an
integrated TEC controller. It has a linear power
stage, a pulse-width modulation (PWM) power
stage, and two zero-drift, rail-to-rail operational
amplifiers. The linear controller works with the PWM
driver to control the internal power MOSFETs in an
H-bridge configuration. By measuring the thermal
sensor feedback voltage and using the integrated
operational amplifiers as a proportional integral
differential (PID) compensator to condition the
signal, the SLM8834 drives current through a TEC to
settle the temperature of a laser diode or a passive
component attached to the TEC module to the
programmed target temperature.
The SLM8834 supports negative temperature
coefficient (NTC) thermistors as well as positive
temperature coefficient (PTC) resistive temperature
detectors (RTD). The target temperature is set as an
analog voltage input either from a digital-to-analog
converter (DAC) or from an external resistor divider.
The temperature control loop of the SLM8834 is
stabilized by PID compensation utilizing the built in,
zero drift chopper amplifiers. The internal 2.50 V
reference voltage provides a 1% accurate output
that is used to bias a thermistor temperature sensing
bridge as well as a voltage divider network to
program the maximum TEC current and voltage
limits for both the heating and cooling modes. With
the zero drift chopper amplifiers, extremely good
long-term temperature stability is maintained via an
autonomous analog temperature control loop.
SYSTEM BLOCK DIAGRAM
FEATURES
Integrated super low R
DSON
MOSFETs for the
TEC controller
High efficiency single inductor architecture
TEC voltage and current operation monitoring
No external sense resistor required
Independent TEC heating and cooling current
limit settings
Programmable maximum TEC voltage
2.0 MHz PWM driver switching frequency
External synchronization
Two integrated, zero drift, rail-to-rail chopper
amplifiers
Capable of NTC or RTD thermal sensors
2.50 V reference output with 1% accuracy
Temperature lock indicator
Available in a 25-ball, 2.5 mm × 2.5 mm WLCSP
or in a 24-lead, 4 mm × 4 mm QFN
APPLICATIONS
TEC temperature control
Optical modules
Optical fiber amplifiers
Optical networking systems
Instruments requiring TEC temperature control
Figure 1.
TEC System Block Diagram
Copyright© 2019, Sillumin
®
Semiconductor Co., Ltd.
Rev0.5, September 2019
1
SLM8834
TYPICAL APPLICATION CIRCUIT
Figure 2.
Typical Application Circuit with Analog PID Compensation in a Temperature Control Loop
Figure 3.
TEC Controller in a Digital Temperature Control Loop (WLCSP)
Copyright© 2019, Sillumin
®
Semiconductor Co., Ltd.
Rev0.5, September 2019
2
SLM8834
PIN CONFIGURATION
Package
25-ball, 2.5 mm × 2.5 mm WLCSP
24-lead, 4 mm × 4 mm QFN
Pin Configuration
(Top View)
PIN DESCRIPTION
Pin No.
Pin Name
WLCSP
QFN
A1, A2
18, 19 PGNDL
N/A
1
A3
A4
A5
B1, B2
B3
B4
B5
C1, C2
N/A
1
N/A
1
C3
C4
C5
D1, D2
D3
D4
D5
E1, E2
E3
E4
E5
20
21
23
24
17
22
1
3
N/A
1
16
15
11
2
4
14
9
8
5
12, 13
10
7
6
TMPGD
OUT1
IN1P
IN2P
LDR
IN1N
IN2N
VLIM/SD
PVIN
PVINL
PVINS
ITEC
OUT2
ILIM
SW
VTEC
EN/SY
VDD
PGNDS
SFB
AGND
VREF
Description
Power Ground of the Linear TEC Controller.
Temperature Good Output.
Output of the Error Amplifier.
Noninverting Input of the Error Amplifier.
Noninverting Input of the Compensation Amplifier.
Output of the Linear TEC Controller.
Inverting Input of the Error Amplifier.
Inverting Input of the Compensation Amplifier.
Voltage Limit/Shutdown. This pin sets the cooling and heating TEC voltage
limits. When this pin is pulled low, the device shuts down.
Power Input for the TEC Controller.
Power Input for the Linear TEC Driver.
Power Input for the PWM TEC Driver.
TEC Current Output.
Output of the Compensation Amplifier.
Current Limit. This pin sets the TEC cooling and heating current limits.
Switch Node Output of the PWM TEC Controller.
TEC Voltage Output.
Enable/Synchronization. Set this pin high to enable the device. An external
synchronization clock input can be applied to this pin.
Power for the Controller Circuits.
Power Ground of the PWM TEC Controller.
Feedback of the PWM TEC Controller Output.
Signal Ground.
2.5 V Reference Output.
Exposed Pad. Solder to the analog ground plane on the board.
N/A
1
0
EPAD
N/A
1
: Not Available.
Copyright© 2019, Sillumin
®
Semiconductor Co., Ltd.
Rev0.5, September 2019
3
SLM8834
ORDERING INFORMATION
Industrial Range: -40°C to +125°C
Order Part No.
SLM8834FA-7G
SLM8834EC
Package
25-ball, 2.5 mm × 2.5 mm WLCSP
24-lead, 4 mm × 4 mm QFN
QTY
500/Reel
1000/Reel
ABSOLUTE MAXIMUM RATINGS
PVIN to PGNDL / PGNDS (WLCSP)
PVINL to PGNDL; PBINS to PGNDS (QFN)
LDR to PGNDL (WLCSP)
LDR to PGNDL (QFN)
SW to PGNDS
SFB / VLIM/SD / ILIM / IN1P / IN1N / IN2P / IN2N / EN/SY to
AGND
AGND to PGNDL / PGNDS
VDD / OUT1 / OUT2 / ITEC / VTEC to AGND
VREF to AGND
Maximum Current
VREF to AGND
OUT1 to AGND
OUT2 to AGND
ITEC to AGND
VTEC to AGND
Maximum junction temperature, T
JMAX
Storage temperature range, T
STG
Operating temperature range, T
J
WLCSP
Junction to Ambient, R
th-JA
QFN
Package Thermal
Resistance
WLCSP
Junction to Case, R
th-JC
QFN
ESD (HBM)
ESD (MM)
ESD (FICDM)
Latch-up
-0.3 V ~ 6.0 V
-0.3 V ~ 6.0 V
-0.3 V ~ V
PVIN
-0.3 V ~ V
PVINL
-0.3 V ~ 6.0 V
-0.3 V ~ V
VDD
-0.3 V ~ 0.3 V
-0.3 V ~ 6.0 V
-0.3 V ~ 3 V
20 mA
50 mA
50 mA
50 mA
50 mA
150°C
-65°~+150°C
-40°C~+125°C
48 °C/w
37 °C/w
0.6 °C/w
1.65 °C/w
2000 V
200 V
1500 V
+/- 100 mA
Note:
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 condition 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.
Copyright© 2019, Sillumin
®
Semiconductor Co., Ltd.
Rev0.5, September 2019
4
SLM8834
ELECTRICAL CHARACTERISTICS (TBD)
Test condition is V
IN
= 2.7 V to 5.5 V, T
J
= −40°C ~ +125°C for minimum/maximum specifications, and T
A
= 25°C
for typical specifications, unless otherwise specified.
Symbol
Power Supply
V
PVIN
V
VDD
I
VDD
I
SD
Driver Supply Voltage
Controller Supply Voltage
Supply Current
Shutdown Current
PWM switching
EN/SY = AGND
or VLIM/SD = AGND
V
VDD
Rising
2.45
80
2.7
2.7
12
350
2.55
90
700
2.65
100
5.5
5.5
V
V
mA
μA
V
mV
Parameter
Condition
Min.
Typ.
Max.
Unit
Under Voltage Lockout
Threshold
UVLO
Under Voltage Lockout
Hysteresis
Reference Voltage
V
VREF
Reference Voltage
Linear Output
Output Voltage Low
V
LDR
Output Voltage High
I
LDR_SOURCE
I
LDR_SINK
Maximum Source Current
Maximum Sink Current
I
VREF
= 0 mA to 10 mA
2.475
2.50
0
V
PVIN
2.525
V
I
LDR
= 0 A
T
J
= -40°C to +105°C
T
J
= -40°C to +125°C
T
J
= -40°C to +105°C
T
J
= -40°C to +125°C
WLCSP, V
PVIN
= 5.0 V
1.5
1.2
V
A
1.5
1.2
A
35
42
50
53
27
32
37
40
0.1
0.1
40
50
57
65
70
40
45
55
65
10
10
μA
μA
V/V
A
A
ms
mΩ
mΩ
R
DSON_PMOS
P-MOSFET ON Resistance
(I
LDR
= 0.6 A)
WLCSP, V
PVIN
= 3.3 V
QFN, V
PVIN
= 5.0 V
QFN, V
PVIN
= 3.3 V
WLCSP, V
PVIN
= 5.0 V
R
DSON
_NMOS
N-MOSFET ON Resistance
(I
LDR
= 0.6 A)
WLCSP, V
PVIN
= 3.3 V
QFN, V
PVIN
= 5.0 V
QFN, V
PVIN
= 3.3 V
I
LDR_P_LKG
I
LDR_N_LKG
ALDR
I
LDR_SH_GNDL
I
LDR_SH_PVIN(L)
T
HICCUP
PWM Output
V
SFB
P-MOSFET Leakage Current
N-MOSFET Leakage Current
Linear Amplifier Gain
LDR Short-Circuit Threshold
LDR Short-Circuit Threshold
Hiccup Cycle
Output Voltage Low
Output Voltage High
LDR short to PGNDL, enter
hiccup
LDR short to PVIN, enter
hiccup
2.2
-2.2
15
0.06 x
V
PVIN
0.93 x
V
PVIN
I
SFB
= 0 A
V
Copyright© 2019, Sillumin
®
Semiconductor Co., Ltd.
Rev0.5, September 2019
5
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