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Analog Devices Inc./Maxim Integrated MAX8614AETD+T
- Part No.:
- MAX8614AETD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
MAX8614AETD+T.pdf
- Description:
- IC REG CONV CCD 2OUT 14TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,688
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Product details
Overview
The MAX8614AETD+T from Maxim Integrated is a dual-output, fixed-frequency (1MHz) step-up/inverting DC-DC converter IC designed for CCD bias and OLED display power in portable imaging systems. It delivers up to +24V positive output (25mA at +15V) and −16V negative output relative to VCC (50mA at −7.5V), operates from 2.7V–5.5V input, and features True Shutdown™, pin-selectable sequencing, and integrated soft-start. It is used in digital cameras and camcorders requiring tightly regulated dual-rail supplies.
For engineers reviewing the MAX8614AETD+T datasheet, MAX8614AETD+T pinout, MAX8614AETD+T application, or MAX8614AETD+T equivalent, key selection criteria include its 14-pin TDFN package, independent regulation of ± outputs, 0.44A/0.33A peak inductor current limits, −40°C to +85°C operation, and fault-flag reporting for overload protection in CCD imaging rails.
Technical Context
The MAX8614AETD+T integrates two current-mode PWM regulators - one for step-up conversion (LXP/PVP path) and one for inverting conversion (LXN path) - sharing a 1MHz oscillator. Each uses internal slope compensation and error amplifiers referenced to 1.01V (FBP) and 0V (FBN), with independent soft-start ramping (step-up: 0→1V; inverter: 1.25V→0V).
It implements True Shutdown via an internal PVP load-switch disconnecting VCC from LXP, eliminating battery drain during shutdown; the inverter achieves load disconnect by turning off its LXN switch. Fault detection triggers FLT low after 100ms of sustained overload on either output, with thermal shutdown at +170°C (typ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion and multi-cell alkaline inputs without external regulation. |
| Positive Output Range | Up to +24V - adjustable via FBP feedback divider; enables high-voltage CCD gate bias (e.g., +15V). |
| Negative Output Range | Up to −16V relative to VCC - adjustable via FBN/REF divider; supports −7.5V OLED cathode bias. |
| LXP Peak Current Limit | 0.44A (typ) - sets maximum inductor energy storage; determines max +15V/25mA capability. |
| LXN Peak Current Limit | 0.33A (typ) - defines inverter drive strength; enables −7.5V/50mA output under typical conditions. |
| Switching Frequency | 1.0MHz (±7%) - enables use of compact 2.2µH–4.7µH inductors and reduces EMI filtering burden. |
| Shutdown Current | 0.1µA (max at +85°C) - ensures negligible battery drain during system sleep in portable devices. |
Pinout & Package
MAX8614AETD+T is housed in a 3mm × 3mm, 14-pin TDFN package with exposed pad (EP) for thermal dissipation. Pin 1 is ONBST; pin 14 is LXN; EP must be soldered to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ONBST (Pin 1) | Step-up enable control | High-logic input activates step-up converter; tied to AVCC for automatic startup or controlled externally for sequencing. |
| FBN (Pin 2) | Negative output feedback | Connects to resistor divider between VINV and REF (1.25V); sets negative output voltage with 0V threshold. |
| AVCC (Pin 3) | Bias supply rail | Must be connected to VCC; powers internal analog circuitry including reference and error amplifiers. |
| REF (Pin 4) | 1.25V precision reference | Stable reference for FBN feedback; requires 0.22µF ceramic bypass to GND for noise immunity. |
| GND (Pin 5) | Analog ground | Reference node for REF, FBP, FBN; must be short-traced to PGND to minimize noise coupling. |
| FLT (Pin 6) | Fault flag output | Open-drain active-low signal indicating overload or thermal fault; pulled up to AVCC via 100kΩ. |
| FBP (Pin 7) | Positive output feedback | Connects to resistor divider between VBST and GND; 1.01V threshold enables precise +VOUT setting. |
| SEQ (Pin 8) | Sequencing mode select | Low = independent ONBST/ONINV control; high = step-up powers before inverter (CCD-safe order). |
| ONINV (Pin 9) | Inverter enable control | High-logic input activates inverter; used with SEQ to coordinate startup timing for imaging sensors. |
| LXP (Pin 10) | Step-up switch node | Connects to inductor and catch diode anode; high-impedance in shutdown due to PVP disconnection. |
| PGND (Pin 11) | Power ground | Return path for LXN/LXP switching currents; must be short-traced to GND to limit ground bounce. |
| PVP (Pin 12) | True Shutdown switch | Internal MOSFET between VCC and LXP; opens in shutdown to break DC path and prevent battery drain. |
| VCC (Pin 13) | Main power input | Supplies both converters; must be connected to AVCC and bypassed with ≥22µF low-ESR capacitor. |
| LXN (Pin 14) | Inverter switch node | Connects to inductor and catch diode cathode; high-impedance in shutdown via internal switch turn-off. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Simultaneous +24V and −16V (vs. VCC) outputs with separate feedback loops (FBP/FBN) and error amps. |
| Pin-selectable sequencing | SEQ pin configures startup order: simultaneous (SEQ=low) or step-up-first (SEQ=high) for CCD compatibility. |
| True Shutdown™ | Zero-load current draw (<0.1µA) achieved by disconnecting VCC from LXP (PVP) and turning off LXN switch. |
| Integrated soft-start | Controlled inrush: step-up reference ramps 0→1V; inverter reference ramps 1.25V→0V over ~10ms. |
| Fault flag with overload timer | FLT asserts low after 100ms of sustained overload on either output, enabling host MCU fault recovery. |
| 1MHz fixed-frequency PWM | Enables small passive components (e.g., 2.2µH inductors) and simplifies EMI filter design vs. variable-frequency alternatives. |
Applications
| CCD Imaging Bias Supply | OLED Display Power |
|---|---|
|
Use Scenario: Providing gate and substrate bias voltages (+15V, −7.5V) for CCD image sensors in digital cameras. IC Role / Device Role / Timing Role: Dual-rail DC-DC converter generating independently regulated positive and negative rails synchronized to sensor exposure timing. Use Value: Eliminates need for discrete boost + inverter ICs; SEQ pin ensures safe power-on sequence preventing CCD latch-up. |
Use Scenario: Supplying anode (+12V) and cathode (−5V) rails for active-matrix OLED displays in smartphones. IC Role / Device Role / Timing Role: Compact dual-output regulator delivering stable, low-noise bias for OLED pixel driving circuits. Use Value: 1MHz switching minimizes audible noise; True Shutdown cuts standby current to preserve battery life. |
| Digital Camera Backlight Driver | Portable Multimedia Audio Codec Bias |
|
Use Scenario: Generating +18V for white LED backlight strings and −5V for op-amp bias in camera viewfinder modules. IC Role / Device Role / Timing Role: Dual-output power manager supplying high-efficiency bias for LED drivers and analog front-end circuitry. Use Value: Up to 90% efficiency at 25mA/+15V reduces thermal load in space-constrained camera housings. |
Use Scenario: Delivering ±5V rails for audio codec line drivers and ADC/DAC reference buffers in camcorders. IC Role / Device Role / Timing Role: Low-noise, sequenced dual supply ensuring clean analog signal paths and avoiding ground bounce. Use Value: Independent FBP/FBN feedback enables precise rail matching; 1.25V REF improves ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8614BETD+ | Higher LXP/LXN current limits (0.8A/0.75A vs. 0.44A/0.33A); same pinout and package. | Supports higher output loads (e.g., +15V/50mA, −7.5V/100mA); suitable when MAX8614AETD+T current headroom is insufficient. | Select MAX8614BETD+ only if design requires >25mA positive or >50mA negative output current. |
| TPS65131RGTR | Fixed +15V/−15V outputs; no adjustable feedback; 1.2MHz switching; different pinout (16-QFN). | Designed for LCD bias; lacks SEQ, FLT, and True Shutdown; not suitable for CCD sequencing or low-quiescent needs. | Choose only for cost-sensitive LCD applications where adjustable voltage and fault reporting are unnecessary. |
Compared with MAX8614BETD+, the MAX8614AETD+T offers lower current capability but tighter control over sequencing and fault response; compared with TPS65131RGTR, it provides flexible voltage adjustment and robust protection features essential for CCD imaging rails.
Availability
MAX8614AETD+T is available at Aetrix Electronics and suitable for digital cameras, camcorders, and portable multimedia devices requiring stable component supply, extended temperature operation (−40°C to +85°C), and dual-rail DC-DC conversion with sequencing control.
Supply support for MAX8614AETD+T 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) designs precision analog, mixed-signal, and power management ICs for demanding applications in imaging, communications, and industrial systems.
The MAX8614A/MAX8614B product line was engineered specifically for CCD and CMOS image sensor biasing, emphasizing dual-rail generation, sequencing flexibility, and ultra-low shutdown current in miniature packages.
FAQ
What is the maximum positive output voltage achievable with the MAX8614AETD+T?
The MAX8614AETD+T supports an adjustable positive output voltage up to +24V, set via the FBP feedback divider referenced to its 1.01V internal threshold. This capability enables direct biasing of high-voltage CCD gates without external level-shifting circuitry, and the output remains stable across the full −40°C to +85°C operating range specified for the MAX8614AETD+T.
How does the MAX8614AETD+T implement True Shutdown™?
The MAX8614AETD+T implements True Shutdown™ using two internal switches: the PVP pin disconnects VCC from the LXP node to eliminate the DC path in the step-up path, while the LXN switch turns off to isolate the inverter output. This reduces total supply current to ≤0.1µA at +85°C, preventing battery drain in portable devices powered by the MAX8614AETD+T.
Can the MAX8614AETD+T generate a negative output referenced to ground?
No - the MAX8614AETD+T's negative output (VINV) is specified relative to VCC, not ground. Its range is VINV − VCC = −16V to 0V. For example, with VCC = 3.3V, the most negative output is −12.7V relative to ground. To achieve ground-referenced negative rails, external level-shifting or a different topology is required - the MAX8614AETD+T is optimized for CCD bias where VINV referenced to VCC is standard.
What is the purpose of the SEQ pin on the MAX8614AETD+T?
The SEQ pin on the MAX8614AETD+T selects power-on sequencing mode: when low, ONBST and ONINV control each converter independently; when high, the step-up output powers up first and stabilizes before the inverter begins soft-start. This prevents voltage reversal and latch-up in CCD imagers, making the MAX8614AETD+T compatible with industry-standard sensor startup requirements.
Does the MAX8614AETD+T include built-in protection features?
Yes - the MAX8614AETD+T includes overload protection that asserts the FLT pin low after 100ms of sustained overcurrent on either output, thermal shutdown at +170°C (typ), UVLO with 25mV hysteresis, and short-circuit foldback on the step-up output. These protections ensure reliable operation in compact, unattended portable systems using the MAX8614AETD+T.
MAX8614AETD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, CCD
- Voltage - Input:
- 3V ~ 5.5V
- Number of Outputs:
- 2
- Voltage - Output:
- Adj up to 24V, Adj down to -16V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TDFN (3x3)
MAX8614AETD+T FAQ
1.How can I place an order for MAX8614AETD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8614AETD+T 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 MAX8614AETD+T reliable?
The price and inventory of MAX8614AETD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8614AETD+T is usually 5 days.
3.What payment methods are accepted for MAX8614AETD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8614AETD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8614AETD+T?
MAX8614AETD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8614AETD+T 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 MAX8614AETD+T?
For technical support, including MAX8614AETD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8614AETD+T requirements.
6.How does Aetrix verify that MAX8614AETD+T is sourced from the original manufacturer or authorized distributors?
All MAX8614AETD+T 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 MAX8614AETD+T meets industry standards.
7.What is the process for return or replacement of MAX8614AETD+T?
All MAX8614AETD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8614AETD+T, 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 MAX8614AETD+T part is unused and in its original packaging.
Return procedure for MAX8614AETD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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