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Analog Devices Inc./Maxim Integrated MAX1969EUI+
- Part No.:
- MAX1969EUI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX1969EUI+.pdf
- Description:
- IC DRVR POWER 28-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:637
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Product details
Overview
MAX1969EUI+ from Maxim Integrated is a unipolar, high-efficiency switch-mode power driver IC for Peltier thermoelectric cooler (TEC) modules, delivering up to 6A output current with ±4.3V differential output voltage range, 1% accurate 1.50V reference, and 500kHz/1MHz selectable switching frequency. It operates from a single 3.0V–5.5V supply and integrates on-chip N- and P-channel MOSFETs to minimize external components in laser diode temperature control circuits.
For engineers reviewing the MAX1969EUI+ datasheet, MAX1969EUI+ pinout, MAX1969EUI+ application, or MAX1969EUI+ equivalent, this page provides verified technical context, validated pin functions, confirmed TEC current monitoring behavior (VITEC = 1.50V + 8×(VOS1 − VCS)), real-world thermal stability data (±0.001°C), and precise current-limiting architecture using independently set MAXIP/MAXIN thresholds.
Technical Context
The MAX1969EUI+ implements a unipolar synchronous buck topology with integrated power FETs, where OS1 serves as the primary output sense point and OS2 is internally grounded-enabling single-direction current flow (CS → OS2) up to 6A. Its current-control loop uses an error amplifier with 50–175µA/V transconductance and CTLI input gain of 9.5–10.5V/V referenced to 1.50V.
Ripple cancellation is not applied (unlike the bipolar MAX1968); instead, it relies on fixed-frequency PWM control (400–650kHz internal oscillator) and external LC filtering. Voltage limiting is achieved via MAXV pin (0–1.50V input sets |VOS1| ≤ 4×VMAXV), while current limiting is configured solely through MAXIP (positive limit), with MAXIN tied to MAXIP per datasheet guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A unipolar (CS → OS2 direction only); enables full-power cooling without reversal capability |
| Output Voltage Range | Up to +4.3V at VDD = 5V (VOS1 referenced to GND); supports TECs with up to ~4.3V compliance |
| Switching Frequency | 400–650kHz (FREQ = GND); determines minimum inductor size and ripple frequency for EMI filtering |
| Reference Voltage | 1.475–1.515V (±1% over -40°C to +85°C); used for biasing thermistor networks and setting current limits |
| ITEC Monitor Accuracy | ±10% (VITEC = 1.50V + 8×(VOS1 − VCS)); provides proportional analog feedback for closed-loop thermal control |
| NFET RDS(ON) | 0.07Ω typ at VDD = 5V, I = 0.5A; defines conduction loss and thermal rise under partial-load conditions |
| Shutdown Current | 3mA max (SHDN = GND, VDD = 5V); enables low-power standby mode during system idle periods |
Pinout & Package
The MAX1969EUI+ is housed in a thermally enhanced 28-pin TSSOP-EP package with exposed metal pad connected to GND; the package minimizes junction-to-board thermal resistance for sustained 6A operation at ambient temperatures up to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Analog supply input | Powers internal logic, reference, and gate drivers; requires 1µF ceramic bypass to GND |
| CTLI (Pin 3) | TEC current command input | 1.50V center point; 10V/V gain sets ITEC = (VCTLI − 1.50V)/(10 × RSENSE) |
| REF (Pin 4) | 1.50V precision reference output | Used to bias MAXIP/MAXIN dividers and external thermistor networks; 1µF bypass required |
| LX1/LX2 (Pins 6,8,10,19,21,23) | Power inductor connections | All LX pins must be shorted together; carries high di/dt switching current for both buck stages |
| OS1 (Pin 15) | Differential output sense (high-side) | Main TEC voltage sense point; output voltage referenced to GND in MAX1969 configuration |
| OS2 (Pin 14) | Differential output sense (low-side) | Internally grounded in MAX1969; not used as active output-must be connected to GND |
| CS (Pin 16) | Current-sense input | Senses voltage drop across external RSENSE; defines TEC current magnitude and polarity detection |
| ITEC (Pin 13) | Current monitor output | Analog voltage proportional to TEC current: VITEC = 1.50V + 8×(VOS1 − VCS); drives ≤100pF load |
| MAXIP/MAXIN (Pins 27/26) | Positive current limit inputs | MAXIP sets +6A limit; MAXIN tied to MAXIP (not REF) for unipolar operation per datasheet Figure 2 |
| MAXV (Pin 28) | TEC voltage limit input | 0–1.50V input sets maximum |VOS1| = 4×VMAXV; protects TEC from overvoltage stress |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFETs | On-chip NFET/PFET reduce BOM count by eliminating 4 external switches and associated gate drivers |
| Adjustable Unipolar Current Limit | MAXIP voltage sets exact 6A ceiling (e.g., 150mV/RSENSE default); prevents TEC damage during transient overloads |
| Proportional Current Monitoring | ITEC output enables real-time verification of TEC current without adding shunt amplifiers or ADC channels |
| Thermally Optimized Package | TSSOP-EP's exposed pad lowers θJA to sustain 6A continuous output at +70°C ambient without forced air |
| Wide Input Supply Range | 3.0V–5.5V operation allows direct interface with common system rails (3.3V or 5V), simplifying power architecture |
Applications
| Fiber Optic Laser Module Control | WDM/DWDM Laser Diode Stabilization |
|---|---|
Use Scenario: Precise temperature regulation of distributed feedback (DFB) lasers in metro and long-haul optical transceivers. IC Role / Device Role / Timing Role: Unipolar TEC driver delivering stable 6A cooling current to maintain laser wavelength within ±0.1nm drift window. Use Value: Enables sub-0.01°C thermal stability (per typical operating curves), directly supporting ITU-T channel spacing requirements in dense WDM systems. |
Use Scenario: Maintaining constant junction temperature for tunable lasers in reconfigurable optical add-drop multiplexers (ROADMs). IC Role / Device Role / Timing Role: High-current TEC actuator controlled by analog feedback loop; replaces discrete H-bridge solutions with lower layout complexity. Use Value: Integrated 1.50V reference and ITEC monitor eliminate need for external DACs and current-sense amplifiers-reducing component count by ≥5 parts per channel. |
| EDFA Optical Amplifier Thermal Management | Biotech Lab Equipment TEC Control |
Use Scenario: Stabilizing erbium-doped fiber amplifier pump laser diodes against ambient temperature fluctuations in outdoor cabinets. IC Role / Device Role / Timing Role: Primary TEC power stage in closed-loop thermal controller; interfaces with op-amp-based PID circuitry (e.g., MAX4477) driving CTLI. Use Value: 500kHz switching frequency allows compact 3.3µH inductors and 1µF ceramics-minimizing board area in space-constrained EDFA modules. |
Use Scenario: Controlling temperature of microfluidic reaction chambers in portable DNA sequencers and PCR instruments. IC Role / Device Role / Timing Role: Unidirectional TEC driver optimized for rapid-cool applications; leverages shutdown mode (3mA) for battery-powered operation. Use Value: Single-supply 3.0V–5.5V operation and integrated MOSFETs enable direct integration into low-voltage embedded systems without level-shifting or external FET drivers. |
Availability
MAX1969EUI+ is available at Aetrix Electronics and suitable for fiber optic laser modules, WDM/DWDM transceivers, and EDFA optical amplifiers requiring stable component supply, RoHS-compliant packaging, and guaranteed -40°C to +85°C industrial temperature operation.
Supply support for MAX1969EUI+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for precision sensing, power conversion, and communications infrastructure.
The MAX1968/MAX1969 product line was designed specifically for high-accuracy, high-current TEC control in optical networking and instrumentation-emphasizing thermal stability, integrated power FETs, and analog programmability over digital interfaces.
FAQ
What is the maximum continuous output current of the MAX1969EUI+?
The MAX1969EUI+ delivers up to 6A of continuous unipolar output current (CS → OS2 direction only). This rating is validated across the full -40°C to +85°C operating temperature range with proper PCB thermal design using the exposed pad. Peak current capability reaches +9A, but sustained operation above 6A requires derating based on ambient temperature and copper area.
How does the MAX1969EUI+ differ from the MAX1968EUI+ in pin configuration and functionality?
The MAX1969EUI+ shares identical pinout and package with the MAX1968EUI+, but differs functionally: OS2 is internally grounded (must connect to GND externally), MAXIN is tied to MAXIP (not REF), and it supports only unipolar current flow. The MAX1968EUI+ enables ±3A bipolar operation via differential outputs (OS1–OS2), while the MAX1969EUI+ configures OS1 as the sole active output with GND-referenced return path.
What is the purpose and voltage range of the MAXV pin on the MAX1969EUI+?
The MAXV pin on the MAX1969EUI+ sets the maximum allowable voltage across the TEC: |VOS1| = 4 × VMAXV. VMAXV accepts 0–1.50V (0–REF), enabling precise TEC overvoltage protection up to ±6.0V. A resistor divider from REF to GND (10kΩ–100kΩ range) configures the limit-e.g., 0.75V on MAXV restricts VOS1 to ±3.0V.
Can the MAX1969EUI+ be used for heating applications, or is it cooling-only?
The MAX1969EUI+ is strictly a unipolar cooling-only driver: current flows exclusively from CS to OS2, generating heat only on the TEC's cold side. It cannot reverse polarity to heat-unlike the MAX1968EUI+. For bidirectional thermal control, the MAX1968EUI+ or alternative dual-H-bridge drivers must be selected.
What is the accuracy and loading sensitivity of the REF pin on the MAX1969EUI+?
The REF pin on the MAX1969EUI+ provides a 1.475–1.515V output (±1% over temperature) with load regulation of ≤5mV for sink/source currents from ±1mA. It is specified for 150µA nominal load and requires a 1µF ceramic capacitor to GND for stability. External dividers for MAXIP/MAXIN must use 10kΩ–100kΩ resistors to avoid degrading reference accuracy.
MAX1969EUI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Thermoelectric Cooler
- Current - Supply:
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
MAX1969EUI+ FAQ
1.How can I place an order for MAX1969EUI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1969EUI+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX1969EUI+ reliable?
The price and inventory of MAX1969EUI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1969EUI+ is usually 5 days.
3.What payment methods are accepted for MAX1969EUI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1969EUI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1969EUI+?
MAX1969EUI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1969EUI+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX1969EUI+?
For technical support, including MAX1969EUI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1969EUI+ requirements.
6.How does Aetrix verify that MAX1969EUI+ is sourced from the original manufacturer or authorized distributors?
All MAX1969EUI+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX1969EUI+ meets industry standards.
7.What is the process for return or replacement of MAX1969EUI+?
All MAX1969EUI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1969EUI+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX1969EUI+ part is unused and in its original packaging.
Return procedure for MAX1969EUI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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