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Analog Devices Inc./Maxim Integrated MAX1932ETC+
- Part No.:
- MAX1932ETC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 12-WQFN Exposed Pad
- Datasheet:
-
MAX1932ETC+.pdf
- Description:
- IC REG CTRLR FBR OPT 1OUT 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:568
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Product details
Overview
MAX1932ETC+ from Maxim Integrated is a digitally controlled, high-voltage DC-DC boost controller IC designed specifically to bias avalanche photodiodes (APDs) in optical receivers. It delivers 4.5V to 90V output with 0.5% voltage accuracy, <1mV output ripple, and integrated high-side current limiting for avalanche detection. Its 8-bit SPI-compatible internal DAC and RC/LC post-filter support enable precise, low-noise APD biasing in telecom and fiber-optic modules.
For engineers reviewing the MAX1932ETC+ datasheet, MAX1932ETC+ pinout, MAX1932ETC+ application, or MAX1932ETC+ equivalent, key selection considerations include its 12-pin Thin QFN package, 2.7V–5.5V input range, 240–360kHz switching frequency, current-limit flag (CL), and dual feedback configuration options (pre- or post-current-sense resistor).
Technical Context
The MAX1932ETC+ employs a fixed-frequency PWM architecture driving an external N-channel MOSFET, with regulation maintained via a precision 1.25V reference and error amplifier. Its unique feedback loop accommodates optional RC or LC post filters without compromising stability, enabling ultra-low-noise output critical for APD signal integrity.
It integrates accurate high-side current sensing across CS+ and CS− pins with a 2.00V ±0.20V threshold and ±0.005%/V common-mode rejection, while the CL flag provides synchronous avalanche-breakdown indication on internal oscillator edges-ensuring safe, data-loss-free APD operation during transient overload conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 4.5V to 90V - supports wide-range APD biasing including 4.5–15V, 20–60V, and 40–90V spans |
| Output Voltage Accuracy | ±0.5% - ensures stable APD gain control and minimizes calibration drift in optical receivers |
| Output Ripple | <1mV (AC-coupled) - enables high-sensitivity photodetection without SNR degradation |
| Switching Frequency | 240–360kHz - balances EMI control, filter size, and efficiency for compact optical module designs |
| Current-Limit Threshold | 2.00V ±0.20V at CS+/CS− - sets precise APD overcurrent protection independent of common-mode voltage up to +110V |
| DAC Resolution | 8-bit SPI interface - allows 256-step digital output adjustment with monotonicity guaranteed |
| Input Supply Range | 2.7V to 5.5V - compatible with standard logic rails and battery-backed systems in portable optical equipment |
Pinout & Package
MAX1932ETC+ is housed in a 12-pin, 4mm × 4mm, 0.75mm-thick Thin QFN package (T1244-4 outline) with exposed thermal pad for enhanced power dissipation in high-voltage bias applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | SPI Serial Clock Input | Synchronizes 8-bit DAC register writes; supports up to 2MHz clock rate with 125ns min pulse width |
| 2 DIN | SPI Serial Data Input | Accepts MSB-first 8-bit command byte for DAC update or shutdown (00 hex disables converter) |
| 3 CL | Current-Limit Indicator Flag | Active-low open-drain output signaling avalanche onset; synchronized to oscillator edge to suppress noise-induced false triggers |
| 4 CS+ | High-Side Current Sense (+) | Connects to APD anode side of sense resistor; 1MΩ typical input resistance to ground enables high-common-mode operation up to +110V |
| 5 CS− | High-Side Current Sense (−) | Connects to APD cathode side; differential threshold of 2.00V ±0.20V defines APD current limit point |
| 6 DACOUT | Internal DAC Output | Provides 1.25V × (CODE + 1)/256 control voltage; sources/sinks ≤50µA for external feedback scaling |
| 7 FB | Voltage Feedback Input | 1.25V reference point; connects to resistive divider from VOUT to set output voltage with ±0.5% accuracy |
| 8 COMP | Error Amplifier Compensation | Connects series RC network to GND to stabilize control loop; actively discharged during shutdown/UVLO |
| 9 GND | Analog/Digital Ground | Single ground reference for all analog and digital circuitry; requires low-inductance connection to minimize switching noise |
| 10 GATE | External N-FET Gate Driver | Drives gate of external MOSFET with 5–10Ω on-resistance; supports fast turn-on/turn-off for efficient high-voltage boost |
| 11 VIN | IC Power Supply | 2.7V–5.5V input; requires ≥1µF ceramic bypass capacitor placed adjacent to pin for noise suppression |
| 12 CS | SPI Chip Select | Active-low enable for serial interface; must be held low for full 8-bit transfer; timing requires ≥300ns CS high period |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% output voltage accuracy | Enables stable APD gain control over temperature and load, reducing system-level recalibration needs in fiber-optic transceivers |
| Integrated high-side current limiting with CL flag | Allows precise, real-time identification of APD avalanche breakdown without external comparators or timing circuits |
| Flexible output voltage programming | Supports four methods-internal 8-bit DAC, external DAC, resistor divider, or voltage source-with independent span/offset tuning |
| Post-filter compatible feedback architecture | Permits RC or LC filtering inside regulation loop without phase-margin loss, achieving <1mV ripple even at 90V output |
| 12-pin 4mm × 4mm Thin QFN package | Minimizes PCB area in space-constrained optical modules while supporting thermal management via exposed pad |
Applications
| Fiber-Optic Transceiver Modules | Telecom Line Cards |
|---|---|
|
Use Scenario: Biasing APDs in SFP+, QSFP, and CFP coherent receiver assemblies operating at 10G–100G data rates. IC Role / Device Role / Timing Role: High-accuracy, low-noise APD bias supply with programmable output and avalanche monitoring. Use Value: Maintains consistent APD responsivity across temperature and aging, directly improving bit-error-rate (BER) performance in long-haul links. |
Use Scenario: Providing adjustable high-voltage bias to APDs in DWDM optical line terminals and OLTs. IC Role / Device Role / Timing Role: Digitally controlled DC-DC boost controller with SPI interface for remote calibration and fault logging. Use Value: Enables software-defined bias tuning per channel, simplifying multi-wavelength system alignment and maintenance. |
| Laser Range Finders | PIN Diode Bias Supplies |
|
Use Scenario: Generating stable 40–90V bias for APDs used in time-of-flight (ToF) distance measurement in LIDAR systems. IC Role / Device Role / Timing Role: Fast-response, low-overshoot APD supply with current-limit flag for pulse-synchronized avalanche detection. Use Value: Eliminates output overshoot during rapid DAC updates, preserving timing fidelity in nanosecond-scale ToF measurements. |
Use Scenario: Replacing discrete high-voltage supplies in optical power monitors and optical switches using PIN diodes. IC Role / Device Role / Timing Role: Programmable high-voltage generator with 0.5% accuracy and minimal board footprint. Use Value: Reduces component count and layout complexity versus op-amp-based solutions while improving voltage stability under varying load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar APD bias supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1933ETC+ | Same pinout and architecture but supports 0.5V–1.5V lower minimum output (3.0V vs. 4.5V); identical DAC, CL flag, and compensation features | Better suited for low-voltage APD arrays or hybrid PIN/APD designs requiring sub-4.5V bias | Select MAX1933ETC+ only if output below 4.5V is required; otherwise MAX1932ETC+ offers wider standard range and identical integration |
| LM5122MH/NOPB | Wide-input synchronous boost controller (3V–65V input); no integrated DAC or CL flag; requires external current sense amp and comparator for avalanche detection | Used in general-purpose high-voltage bias where digital control and APD-specific protection are not mandatory | Choose LM5122MH/NOPB for cost-sensitive, non-APD applications or when full custom control loop design is preferred over integrated safety features |
Compared with MAX1933ETC+, the MAX1932ETC+ provides higher minimum output voltage ideal for standard APDs, while versus LM5122MH/NOPB it delivers turnkey APD biasing with built-in avalanche monitoring and digital programmability-reducing BOM count and validation effort by eliminating external protection circuitry.
Availability
MAX1932ETC+ is available at Aetrix Electronics and suitable for fiber-optic transceivers, telecom line cards, laser range finders, and PIN diode bias supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX1932ETC+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for precision, high-reliability applications.
The MAX1932ETC+ belongs to Maxim's APD bias controller product line, engineered specifically for optical receiver systems demanding ultra-low-noise, digitally programmable, and avalanche-safe high-voltage generation.
FAQ
What is the primary function of the MAX1932ETC+ in optical systems?
The MAX1932ETC+ functions as a digitally controlled, high-accuracy APD bias supply that generates 4.5V to 90V output with 0.5% voltage accuracy and <1mV ripple. Its integrated high-side current limiting and CL flag enable safe, real-time avalanche detection-making MAX1932ETC+ essential for reliable photodetection in fiber-optic receivers and LIDAR systems.
How does the CL pin on the MAX1932ETC+ improve APD system reliability?
The CL pin on the MAX1932ETC+ is an active-low current-limit indicator that synchronously asserts when the APD reaches avalanche breakdown. By tying CL to a microcontroller interrupt or status register, designers can precisely calibrate the APD operating point and prevent damage from sustained overcurrent-enhancing long-term reliability of MAX1932ETC+-based optical front-ends.
Can the MAX1932ETC+ operate with an external DAC instead of its internal 8-bit DAC?
Yes, the MAX1932ETC+ supports external DAC control via the DACOUT pin, which accepts any voltage source between 0V and 2.5V. When using an external DAC, the internal DAC is disabled, and output voltage is set by the external control voltage scaled through R6 and R5 in the feedback network-giving designers flexibility to integrate higher-resolution or temperature-compensated DACs into MAX1932ETC+ systems.
What package type and thermal characteristics does the MAX1932ETC+ use?
The MAX1932ETC+ uses a 12-pin Thin QFN package (4mm × 4mm, 0.75mm height) with exposed thermal pad. At TA = +70°C, its continuous power dissipation is 1349mW, derating by 16.9mW/°C above that temperature. The junction temperature rating is +150°C, supporting operation in thermally demanding optical modules where MAX1932ETC+ maintains stable bias under ambient extremes.
Does the MAX1932ETC+ require external components for basic operation, and what are the minimum requirements?
Yes, the MAX1932ETC+ requires external components: an N-channel MOSFET (driven by GATE), output diode, inductor, input/output capacitors, and current-sense resistor (R1). Minimum requirements include a 1µF ceramic capacitor on VIN, a 1.25V feedback divider (R5/R8), and R1 sized per ILIMIT = 2V/R1. These ensure proper startup, regulation, and current limiting-core functionality of the MAX1932ETC+ in any APD bias application.
MAX1932ETC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller, Fiber Optic Network
- Voltage - Input:
- 2.7V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 4.5V ~ 90V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (4x4)
MAX1932ETC+ FAQ
1.How can I place an order for MAX1932ETC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1932ETC+ 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 MAX1932ETC+ reliable?
The price and inventory of MAX1932ETC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1932ETC+ is usually 5 days.
3.What payment methods are accepted for MAX1932ETC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1932ETC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1932ETC+?
MAX1932ETC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1932ETC+ 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 MAX1932ETC+?
For technical support, including MAX1932ETC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1932ETC+ requirements.
6.How does Aetrix verify that MAX1932ETC+ is sourced from the original manufacturer or authorized distributors?
All MAX1932ETC+ 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 MAX1932ETC+ meets industry standards.
7.What is the process for return or replacement of MAX1932ETC+?
All MAX1932ETC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1932ETC+, 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 MAX1932ETC+ part is unused and in its original packaging.
Return procedure for MAX1932ETC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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