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Analog Devices Inc./Maxim Integrated MAX1801EKA+T
- Part No.:
- MAX1801EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- SOT-23-8
- Datasheet:
-
MAX1801EKA+T.pdf
- Description:
- IC REG CTRL DGTL CAM 1OUT SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,629
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Product details
Overview
The MAX1801EKA+T from Maxim Integrated is a step-up slave DC-DC controller IC designed to operate synchronously with MAX1800 (boost) or MAX1802 (buck) master converters in portable imaging systems. It drives an external N-channel MOSFET, supports SEPIC and flyback topologies, features 100kHz–1MHz adjustable switching frequency, 40%–90% adjustable duty-cycle limit, and delivers regulated output voltages up to +18V in digital still/video cameras.
For engineers reviewing the MAX1801EKA+T datasheet, MAX1801EKA+T pinout, MAX1801EKA+T application, or MAX1801EKA+T equivalent, key selection considerations include its master-synchronized oscillator input (OSC), DCON-based duty-cycle control, FB-regulated voltage feedback, DL gate-drive capability (500mA typical), and 8-pin SOT23 package compatibility with space-constrained camera power rails.
Technical Context
The MAX1801EKA+T operates as a voltage-mode PWM controller using an externally supplied sawtooth oscillator signal (100kHz–1MHz) from a MAX1800/MAX1802 master IC at the OSC pin. Its internal transconductance error amplifier compares FB voltage against a 1.25V reference (supplied via REF pin) to generate COMP compensation voltage.
Duty cycle is limited by comparing DCON voltage against the OSC waveform; soft-start ramps internal reference over 1024 oscillator cycles; short-circuit protection disables the controller after 1024 clock cycles if COMP is clamped at 2.7V due to sustained output fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.7V to 5.5V - powers IC from battery or intermediate rail; UVLO triggers at 2.2V–2.5V rising edge. |
| Oscillator Frequency | 100kHz to 1000kHz - set externally by master IC; determines switching period and influences inductor/capacitor sizing. |
| Max Duty Cycle Range | 40% to 90% - adjusted via DCON voltage divider; prevents magnetic saturation and enables discontinuous conduction mode. |
| FB Regulation Voltage | 1.238V to 1.263V - precise internal reference for output voltage setting via resistive divider (e.g., VOUT = 1.25 × (1 + R1/R2)). |
| DL Drive Capability | 500mA peak, 5Ω typical on-resistance - directly drives logic-level N-MOSFET gates without external buffer in compact camera designs. |
| Shutdown Current | 0.01µA - achieved when VREF < 0.4V; enables ultra-low-power battery preservation during standby. |
| Soft-Start Duration | 1024 oscillator cycles - limits inrush current and prevents battery sag during power-up of camera flash or sensor rails. |
Pinout & Package
The MAX1801EKA+T is housed in an 8-pin SOT23 package (JEDEC MO-203AA), measuring 2.9mm × 1.6mm × 1.1mm, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OSC | Oscillator Input | Accepts 0–1.25V sawtooth waveform from MAX1800/MAX1802 master; sets switching frequency and internal timing. |
| 2 - GND | Ground Reference | Power and signal return path; must be low-impedance connection to minimize noise coupling into COMP/FB. |
| 3 - REF | Reference Input | Receives 1.25V reference from master IC; device enables only if REF > 1.0V; sinks ≤30µA during soft-start. |
| 4 - DCON | Duty-Cycle Control | Sets max duty cycle via resistor divider from REF; <0.35V disables controller; 0.625V yields 50%, 1.25V yields 84% default. |
| 5 - COMP | Compensation Output | Transconductance amplifier output; connects RC network to GND for loop stability in voltage-mode control. |
| 6 - FB | Feedback Input | High-impedance (≤100nA bias) node for resistive divider; regulates output to 1.25V × (1 + R1/R2). |
| 7 - IN | Supply Bias Input | 2.7–5.5V IC power rail; requires ≥0.1µF ceramic bypass to GND near pin for noise immunity. |
| 8 - DL | Gate Drive Output | Push-pull driver swinging between IN and GND; delivers 500mA peak to switch external N-MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| Master-Slave Synchronization | Eliminates redundant oscillators and references; ensures harmonic-aligned switching across multiple rails to reduce EMI in camera modules. |
| Topology Flexibility | Supports boost, SEPIC, and flyback configurations via external component selection-enables single IC to serve diverse voltage conversion needs. |
| Adjustable Duty-Cycle Limit | Prevents transformer/magnetic core saturation in flyback/SEPIC; allows intentional DCM operation for simplified stability in low-IOUT modes. |
| Integrated Soft-Start | Ramps regulation reference over 1024 clock cycles-limits peak inrush current during camera power-on without external circuitry. |
| Short-Circuit Fault Protection | Disables output after 1024 oscillator cycles if COMP clamped at 2.7V-protects transformer-coupled outputs in flyback/SEPIC, not step-up. |
Applications
| Digital Still Cameras | Digital Video Cameras |
|---|---|
Use Scenario: Powering CCD/CMOS image sensors and flash LED drivers requiring stable +7V to +18V rails from 1.5–3.6V battery inputs. IC Role / Device Role / Timing Role: Slave controller synchronized to MAX1800 master; provides regulated high-voltage rail while sharing oscillator and reference to minimize component count. Use Value: Reduces BOM cost and board area by eliminating duplicate timing/reference circuits; improves EMI profile through synchronized switching. | Use Scenario: Generating auxiliary supplies for video processing ICs, lens actuators, and display backlights in handheld camcorders. IC Role / Device Role / Timing Role: Step-up slave managing isolated or non-isolated boost/SEPIC outputs; coordinated with MAX1802 buck master for multi-rail efficiency. Use Value: Enables rapid expansion of power rails without redesigning master timing-supports new feature additions (e.g., optical zoom, HDMI output) with minimal layout changes. |
| Portable DVD Players | Internet Access Tablets |
Use Scenario: Supplying +5V and +12V rails for laser diode drivers and servo motors in portable optical disc players. IC Role / Device Role / Timing Role: Flyback topology slave controller delivering isolated outputs; uses master's OSC/REF to maintain tight cross-regulation across secondaries. Use Value: Achieves isolation and multi-output capability without adding optocouplers or secondary-side controllers-reducing bill-of-materials and assembly complexity. | Use Scenario: Providing programmable auxiliary voltages for USB OTG, SIM card interfaces, or RF front-end biasing in early-generation internet tablets. IC Role / Device Role / Timing Role: SEPIC-configured slave supporting wide VIN range (1.5–3.6V) and regulated VOUT despite battery droop; DCON-adjusted duty cycle maintains stability under load transients. Use Value: Maintains consistent output regulation during deep discharge (down to 1.5V battery), extending usable runtime without compromising peripheral functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up slave DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1711EEE+ | Integrated dual-channel gate driver; no external MOSFET required; fixed 300kHz frequency; lacks DCON-adjustable duty cycle. | Targeted at TFT-LCD bias supplies; includes VCOM, AVDD, and VGH generators-not optimized for camera-specific transient response. | Select MAX1711EEE+ only when driving integrated LCD power chains; not suitable as direct functional replacement for MAX1801EKA+T in master-slave camera architectures. |
| TPS61088RHLR | Standalone boost controller with integrated 10A FET; 2.7–12V input; 4.5–20V output; no master-synchronization capability; no REF/OSC pins. | Designed for single-rail high-current boost (e.g., USB PD, portable speakers); cannot share timing/reference with companion masters like MAX1800/1802. | Choose TPS61088RHLR for self-contained high-power boost where synchronization is unnecessary; avoid when system-level EMI control or multi-rail coordination is required. |
Compared with MAX1711EEE+ and TPS61088RHLR, the MAX1801EKA+T uniquely enables scalable, low-EMI multi-rail power in camera systems via master-slave architecture-offering design flexibility unattainable with monolithic or standalone alternatives.
Availability
The MAX1801EKA+T is available at Aetrix Electronics and suitable for digital still cameras, digital video cameras, and portable optical devices requiring stable component supply, long-lifecycle support, and guaranteed traceability for consumer electronics production.
Supply support for MAX1801EKA+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for portable, industrial, and communications applications.
The MAX1801EKA+T belongs to Maxim's camera power management product line, engineered specifically to simplify multi-rail DC-DC design in digital imaging systems through master-slave synchronization and topology flexibility.
FAQ
What is the primary function of the MAX1801EKA+T in a power system?
The MAX1801EKA+T functions as a step-up slave DC-DC controller that relies on a MAX1800 or MAX1802 master IC for oscillator signal and reference voltage. It drives an external N-channel MOSFET to generate regulated higher-voltage outputs in boost, SEPIC, or flyback topologies-enabling compact, low-EMI multi-rail power in digital cameras without duplicating timing or reference circuitry.
Can the MAX1801EKA+T operate independently without a MAX1800 or MAX1802 master IC?
No, the MAX1801EKA+T cannot operate independently. It requires an external 0–1.25V sawtooth oscillator signal at the OSC pin and a 1.25V reference voltage at the REF pin-both supplied exclusively by a MAX1800 or MAX1802 master converter. Without these signals, the MAX1801EKA+T remains disabled and cannot initiate switching or regulation.
How does the DCON pin affect the MAX1801EKA+T's operation?
The DCON pin sets the maximum duty cycle of the MAX1801EKA+T by comparing its voltage against the OSC sawtooth waveform. At 0.625V, it yields ~50%; at 1.25V, ~84% default; and across 0.4–1.0V, it adjusts linearly from ~40% to ~90%. Pulling DCON below 0.35V disables the controller, making it a functional enable/disable input with analog duty-cycle control.
What protection features does the MAX1801EKA+T include?
The MAX1801EKA+T includes soft-start (1024-cycle ramp), undervoltage lockout (VIN < 2.2V, REF < 0.9V), short-circuit protection (disables after 1024 OSC cycles if COMP is clamped at 2.7V), and shutdown mode (0.01µA current when REF < 0.4V). Note: short-circuit protection applies only to transformer-coupled (flyback/SEPIC) topologies-not direct step-up due to inherent DC path.
Is the MAX1801EKA+T pin-compatible with other Maxim slave controllers like the MAX1803?
No, the MAX1801EKA+T is not pin-compatible with the MAX1803. The MAX1803 is a step-down slave controller with different pin functions (e.g., its DCON pin controls current limit, not duty cycle; its FB input expects different feedback scaling). Pin mapping, electrical behavior, and topology support differ fundamentally-requiring separate PCB layout and schematic integration for each device.
MAX1801EKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Digital Camera
- Voltage - Input:
- 2.7V ~ 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- -
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX1801EKA+T FAQ
1.How can I place an order for MAX1801EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1801EKA+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 MAX1801EKA+T reliable?
The price and inventory of MAX1801EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1801EKA+T is usually 5 days.
3.What payment methods are accepted for MAX1801EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1801EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1801EKA+T?
MAX1801EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1801EKA+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 MAX1801EKA+T?
For technical support, including MAX1801EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1801EKA+T requirements.
6.How does Aetrix verify that MAX1801EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX1801EKA+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 MAX1801EKA+T meets industry standards.
7.What is the process for return or replacement of MAX1801EKA+T?
All MAX1801EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1801EKA+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 MAX1801EKA+T part is unused and in its original packaging.
Return procedure for MAX1801EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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