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Analog Devices Inc./Maxim Integrated MAX1802EHJ+
- Part No.:
- MAX1802EHJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 32-TQFP
- Datasheet:
-
MAX1802EHJ+.pdf
- Description:
- IC REG CTLR DGTL CAM 5OUT 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,942
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Product details
Overview
The MAX1802EHJ+ from Maxim Integrated is a highly integrated power-management IC for digital still and video cameras, combining two synchronous step-down DC-DC converters (main and core), three auxiliary step-up controllers, and master-slave interface capability for external MAX1801 slave controllers. It supports 2.5V–11V input (e.g., 3–4 alkaline or 2 Li+ cells), delivers up to 94% efficiency on both main and core outputs, and regulates main output from 2.7V–5.5V and core output from 1.25V–5.5V - enabling compact, high-efficiency camera power rails for CCD, LCD, and backlight subsystems.
For engineers reviewing the MAX1802EHJ+ datasheet, MAX1802EHJ+ pinout, MAX1802EHJ+ application, or MAX1802EHJ+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world load-transient performance data, and precise alternative selection guidance for camera power architecture design.
Technical Context
The MAX1802EHJ+ implements a master power controller architecture with independent PWM current-mode control loops for its main and core step-down converters, each featuring internal error amplifiers (FBM/COMPM and FBC/COMPC), slope compensation, and soft-start (1024 OSC cycles). Its three auxiliary controllers operate in voltage-mode, using shared reference (1.248V typ) and oscillator resources, with individually adjustable maximum duty cycle (40–90%) via DCON1–DCON3 pins.
It integrates a VL linear regulator (2.83–3.12V output) that auto-switches between VDDM and VDDC supply domains, plus dedicated gate drivers (DHM/DLM for main; DL1–DL3 for auxiliaries) delivering 400mA peak drive current and <11Ω on-resistance - enabling direct interfacing with discrete external MOSFETs without buffer stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 11V - supports single- or dual-cell Li+ and multi-cell alkaline battery inputs without pre-regulation. |
| Main Output Voltage Range | 2.7V to 5.5V - resistor-adjustable via FBM feedback, enabling flexible rail generation for processor I/O or memory interfaces. |
| Core Output Voltage Range | 1.25V to 5.5V - fine-tuned regulation down to sub-1.8V logic levels, suitable for digital camera baseband or image sensor cores. |
| Peak Efficiency | 94% - achieved on both main and core converters, minimizing thermal load in space-constrained handheld enclosures. |
| Switching Frequency | Up to 1MHz - set externally via ROSC/COSC, allowing optimization of inductor size, EMI filtering, and transient response. |
| Shutdown Supply Current | 3µA (typ) - ultra-low quiescent draw enables long standby time in battery-powered imaging devices. |
| Operating Temperature | −40°C to +85°C - qualified for consumer and industrial portable camera operation across environmental extremes. |
Pinout & Package
The MAX1802EHJ+ is housed in a 32-pin TQFP package (5mm × 5mm body, 0.5mm pitch) with exposed thermal pad (EP), optimized for thermal dissipation in high-current camera power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FBM) | Main converter feedback input | Connects to resistor divider from main output; sets regulation point at 1.248V reference - determines final output voltage accuracy and stability. |
| 6 (DHM) | Main P-MOSFET gate driver | 400mA peak sourcing/sinking drive directly controls external high-side P-channel switch - eliminates need for level-shifting buffers. |
| 8 (DLM) | Main N-MOSFET gate driver | Drives synchronous rectifier N-FET; complements DHM to enable high-efficiency buck topology with continuous conduction mode support. |
| 24 (ONC) | Core converter enable | Active-high logic input; independent control allows sequenced power-up of core rail (e.g., after main rail stabilization). |
| 31 (REF) | 1.248V precision reference output | Stable 1.248V ±12mV reference used by all five error amplifiers (FBM/FBC/FB1/FB2/FB3) - ensures consistent feedback accuracy across all regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous main/core buck topology | Enables >94% efficiency at full load without external Schottky diode - reduces BOM count and thermal footprint in camera PCBs. |
| Three independent auxiliary step-up controllers | Each with dedicated DLx driver, FBx input, and DCONx duty-cycle control - supports simultaneous powering of CCD bias, TFT LCD, and white LED backlight from single IC. |
| Master-slave interface (OSC/POWER/REF) | Provides clock synchronization, reference voltage, and power to external MAX1801 slaves - eliminates noise coupling from unsynchronized switching in multi-rail systems. |
| Internal soft-start (1024 OSC cycles) | Prevents inrush current during startup across all converters - avoids brownout on shared battery sources in portable imaging devices. |
| Overload protection on all DC-DC channels | Integrated fault detection and automatic shutdown per converter - protects external MOSFETs and load circuitry during short-circuit or overcurrent events. |
Applications
| Digital Still Camera Power System | Digital Video Camera Power Architecture |
|---|---|
|
Use Scenario: Compact DSLR or mirrorless camera requiring multiple isolated, low-noise rails for image sensor, ISP, memory, and display. IC Role / Device Role / Timing Role: Central power manager coordinating sequencing, voltage regulation, and dynamic load handling across six regulated outputs. Use Value: Single-chip solution replaces discrete PMIC + boost controllers, reducing board area by >35% while maintaining 94% peak efficiency on critical 3.3V and 1.8V rails. |
Use Scenario: Handheld camcorder with real-time video encoding, CMOS sensor, OLED viewfinder, and USB host interface. IC Role / Device Role / Timing Role: Master controller synchronizing switching frequencies of main, core, and auxiliary converters to minimize beat-frequency EMI in analog video paths. Use Value: Harmonic-aligned operation cuts conducted EMI by 12dB in 30–100MHz band - eliminates need for additional ferrite beads on sensor power lines. |
| Internet Access Tablet Imaging Subsystem | PDA with Integrated Camera Module |
|
Use Scenario: Android-based tablet with front/rear cameras, flash LED, and touch-screen controller requiring tightly regulated, low-quiescent power. IC Role / Device Role / Timing Role: Dual-role power IC supplying 1.2V core, 2.8V sensor IO, 5V USB OTG, and 24V CCD bias - managed via ONM/ONC/ON1 enables. Use Value: 3µA shutdown current extends tablet standby time to >14 days; VL switchover logic maintains stable 3.0V bias even during Li+ cell discharge from 4.2V to 3.0V. |
Use Scenario: Legacy PDA with VGA camera, monochrome LCD, and SD card interface operating from two AA cells. IC Role / Device Role / Timing Role: Primary DC-DC hub generating 3.3V main rail, 1.8V core, and 12V LCD bias - leveraging alkaline-compatible 2.5V–11V input range. Use Value: 94% efficiency at 100mA load preserves battery life under continuous capture; 400mA gate drivers eliminate external driver ICs for cost-sensitive designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail camera power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8647ETL+ | Single-chip solution with integrated MOSFETs (no external FETs required); lower max input (5.5V); no auxiliary boost controllers. | Best for space-constrained designs where external FET layout is impractical and only main + core rails are needed. | Select MAX8647ETL+ when board area is critical and camera system does not require CCD bias or high-voltage backlight driving. |
| TPS65132ARSLR | Dedicated LCD bias IC with integrated charge pumps; lacks main/core buck converters and slave interface; 3.0V–5.5V input only. | Used exclusively for TFT/LCD power in systems where main SoC rail is supplied separately. | Choose TPS65132ARSLR only as supplemental bias generator - not a functional replacement for MAX1802EHJ+'s full power architecture. |
Compared with MAX8647ETL+ and TPS65132ARSLR, the MAX1802EHJ+ uniquely combines dual synchronous buck regulation, three independent boost controllers, and master-slave expansion - making it the only option capable of replacing discrete power solutions in high-performance digital still/video cameras without compromising rail count, efficiency, or sequencing control.
Availability
MAX1802EHJ+ is available at Aetrix Electronics and suitable for digital still cameras, digital video cameras, and internet access tablets requiring stable component supply, long-lifecycle availability, and guaranteed traceable sourcing for production programs.
Supply support for MAX1802EHJ+ 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 demanding applications including imaging, industrial, and communications systems.
The MAX1802EHJ+ belongs to Maxim's digital camera power management product line, designed specifically to consolidate multi-rail power conversion, sequencing, and noise-sensitive analog bias generation into a single chip for portable imaging devices.
FAQ
What is the maximum supported switching frequency for the MAX1802EHJ+?
The MAX1802EHJ+ supports an adjustable switching frequency up to 1MHz, set externally using a resistor (ROSC) from OSC to VL and a capacitor (COSC) from OSC to GND. At ROSC = 100kΩ and COSC = 47pF, typical frequency is ~1MHz; higher values reduce frequency for improved efficiency or EMI performance. This flexibility allows designers to balance inductor size, ripple, and electromagnetic compatibility in camera PCB layouts.
Does the MAX1802EHJ+ integrate power MOSFETs or require external ones?
The MAX1802EHJ+ does not integrate power MOSFETs for its main or core buck converters - it drives external P-channel (via DHM) and N-channel (via DLM) switches, and external N-channel FETs for auxiliary controllers (via DL1–DL3). However, its core converter includes internal P- and N-channel MOSFETs connected to LXC, supporting up to 500mA output without external switches. This hybrid architecture offers layout flexibility while minimizing component count for the core rail.
How does the VL regulator function in the MAX1802EHJ+ power architecture?
The VL regulator in the MAX1802EHJ+ is an internal low-voltage bypass source that automatically selects between VDDM (battery) and VDDC (core input) based on voltage level: it powers from VDDM when VDDC < 2.4V, then switches to VDDC above 2.4V with 100mV hysteresis. Its 2.83–3.12V output supplies internal circuitry and serves as bias for OSC timing and DCONx duty-cycle control - ensuring stable operation across full battery discharge range.
Can the MAX1802EHJ+ be used without the MAX1801 slave controller?
Yes, the MAX1802EHJ+ operates fully independently without the MAX1801. Its integrated main, core, and three auxiliary controllers provide complete power management for most digital cameras. The MAX1801 interface (OSC/POWER/REF outputs) is optional and intended only for expanding rail count or offloading specific topologies (e.g., SEPIC or flyback) - omitting it simplifies design and reduces BOM cost while retaining all primary functionality of the MAX1802EHJ+.
What protection features are built into the MAX1802EHJ+?
The MAX1802EHJ+ includes overload protection on all five DC-DC channels (main, core, and three auxiliaries), implemented via cycle-by-cycle current limiting and fault latching. Each converter shuts down independently upon overcurrent detection, with restart attempted after soft-start interval. Additional protections include undervoltage lockout on VL (2.25–2.50V threshold) and REF (0.9–1.1V), thermal shutdown, and robust absolute maximum ratings (e.g., −0.3V to +12V on VDDM) - ensuring reliable operation in real-world camera power environments.
MAX1802EHJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Controller/Converter, Digital Cameras
- Voltage - Input:
- 2.5V ~ 11V
- Number of Outputs:
- 5
- Voltage - Output:
- 1.25V ~ 5.5V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFP (5x5)
MAX1802EHJ+ FAQ
1.How can I place an order for MAX1802EHJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1802EHJ+ 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 MAX1802EHJ+ reliable?
The price and inventory of MAX1802EHJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1802EHJ+ is usually 5 days.
3.What payment methods are accepted for MAX1802EHJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1802EHJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1802EHJ+?
MAX1802EHJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1802EHJ+ 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 MAX1802EHJ+?
For technical support, including MAX1802EHJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1802EHJ+ requirements.
6.How does Aetrix verify that MAX1802EHJ+ is sourced from the original manufacturer or authorized distributors?
All MAX1802EHJ+ 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 MAX1802EHJ+ meets industry standards.
7.What is the process for return or replacement of MAX1802EHJ+?
All MAX1802EHJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1802EHJ+, 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 MAX1802EHJ+ part is unused and in its original packaging.
Return procedure for MAX1802EHJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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