My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1585ETJ+
- Part No.:
- MAX1585ETJ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
MAX1585ETJ+.pdf
- Description:
- IC REG CTLR DGTL CAM 5OUT 32TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:180
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1585ETJ+ from Maxim Integrated is a 5-channel power management IC for slim digital still cameras, integrating one synchronous step-up DC-DC converter (95% efficient), one synchronous step-down DC-DC converter (90% boost-buck capable), and three PWM controllers-including one inverting controller for negative CCD bias (−7.5V). It operates from 0.7V to 5.5V input and delivers regulated outputs for system +5V, core +1.8V, LCD/CCD/LED +15V, CCD −7.5V, and logic +3.3V in a single 32-pin thin QFN (5mm × 5mm).
For engineers reviewing the MAX1585ETJ+ datasheet, MAX1585ETJ+ pinout, MAX1585ETJ+ application, or MAX1585ETJ+ equivalent, this page provides verified functional architecture, validated pin roles, confirmed efficiency curves across load and input voltage, exact auxiliary controller configurations (including inverting AUX2), and real-world design constraints such as startup voltage threshold (0.9V), idle-mode transition current (150mA for step-up), and thermal shutdown at +160°C.
Technical Context
The MAX1585ETJ+ implements a compound power architecture: its primary step-up channel uses internal N- and P-channel MOSFETs (150mΩ/250mΩ typical RDS(on)) to generate PVSU up to 5.5V; the step-down channel can be powered either from battery or PVSU, enabling true boost-buck operation with compound efficiency up to 90%. Its three auxiliary PWM controllers are functionally distinct-AUX1 is step-up (DL1 gate driver), AUX2 is inverting (DL2 + INDL2 + FB2 = 0V threshold), and AUX3 is step-down (DL3 gate driver)-each with independent soft-start (4096 OSC cycles for AUX1/AUX2/AUX3) and dedicated power-OK signaling.
All five channels share a common oscillator (100kHz–1MHz, set by ROSC/COSC), operate in current-mode control, and feature synchronized startup sequencing: ONSU must reach regulation before ONSD, ON1, ON2, and ON3 are enabled (1024 OSC cycles delay). Overload protection triggers after 100,000 OSC cycles, and thermal shutdown activates at +160°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V to 5.5V - supports single-cell Li+ (2.7–4.2V), 2-cell AA/NiMH (1.8–3.2V), and low-voltage startup down to 0.9V with Schottky assist. |
| Step-Up Efficiency | Up to 95% - achieved using integrated N/P-channel MOSFETs; enables compact, high-efficiency main rail generation (e.g., +5V @ 300mA from 3.0V input). |
| Boost-Buck Compound Efficiency | Up to 90% - realized when step-down channel is powered from PVSU output, allowing stable +1.5V or +1.8V core supply even as battery drops below output voltage. |
| AUX2 Function | Inverting controller - FB2 threshold = 0V; generates −7.5V @ 40mA for CCD bias using external P-FET and inductor; requires INDL2 tied to battery for proper PFET gate control. |
| Shutdown Current | ≤5µA into PVSU - enables ultra-low quiescent power during camera standby mode without compromising fast wake-up capability. |
| Oscillator Frequency Range | 100kHz to 1MHz - set externally via ROSC (47kΩ typical) and COSC (100pF typical); higher frequencies reduce inductor size but increase switching losses. |
| Thermal Shutdown | +160°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design; forces global shutdown until junction cools. |
Pinout & Package
MAX1585ETJ+ is housed in a 32-pin thin QFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad (EP) requiring solder connection to PCB ground plane for thermal and mechanical integrity. Pin functions are validated per Maxim's official pin description table and schematic reference design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ONSU (Pin 12) | Step-up enable input | Logic-high active; internal 330kΩ pulldown; initiates startup sequence only when input ≥0.9V; locks out all other ON_ pins until regulation achieved. |
| PVSU (Pin 22) | Step-up output voltage rail | Primary power rail (up to 5.5V); supplies PV, PVSD, and AUX controllers; requires 47µF ceramic output capacitor and tight PGSD/PGSU grounding. |
| FB2 (Pin 23) | AUX2 inverting controller feedback | 0V threshold reference; connects to resistive divider between −7.5V output and REF (1.25V) to set precise negative output voltage. |
| INDL2 (Pin 25) | AUX2 gate-drive voltage source | Tied to battery (not PVSU) to ensure full turn-off of external P-FET during DL2 high state; critical for reliable inverter operation. |
| DL2 (Pin 27) | AUX2 gate-driver output | Drives P-FET source-to-drain in inverting topology; actively pulled high in shutdown/overload to disable negative rail safely. |
| SDOK (Pin 17) | Step-down power-OK signal | Open-drain active-low; goes low after 2048 OSC-cycle soft-start completes and output is within regulation; used for system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated step-up + step-down converters | Eliminates need for 2–3 external power ICs; reduces BOM count by ≥7 components and saves ≥120mm² PCB area in DSC designs. |
| AUX2 inverting controller | Enables high-current (40mA) negative CCD bias (−7.5V) without transformers or charge pumps-critical for large-pixel CCD sensors in premium cameras. |
| No-transformer auxiliary design | Supports transformerless flyback-free topologies for AUX1 (+15V) and AUX3 (+3.3V), lowering EMI and simplifying layout versus isolated solutions. |
| Sequenced multi-rail startup | Hardware-enforced timing: step-up must regulate before step-down and AUX channels enable (1024 OSC cycles), preventing brown-out and rail collapse. |
| Idle-mode efficiency optimization | Switches step-up to variable-frequency pulse-skipping below 150mA load, maintaining >85% efficiency at 10mA while reducing audible noise. |
Applications
| Digital Still Camera Power System | CCD Image Sensor Bias Supply |
|---|---|
|
Use Scenario: Slim-body digital camera requiring simultaneous +5V system rail, +1.8V DSP core, +15V LCD backlight, −7.5V CCD bias, and +3.3V logic-all from single Li+ cell. IC Role / Device Role / Timing Role: Central 5-channel PMIC managing all voltage domains with hardware-sequenced startup, shared oscillator, and coordinated fault handling. Use Value: Reduces discrete power components by 60%, cuts total solution size by 35%, and enables <12ms full-rail startup time from battery insertion. |
Use Scenario: High-resolution CCD sensor demanding stable −7.5V @ 40mA with low ripple (<10mVpp) for minimal image noise in low-light capture. IC Role / Device Role / Timing Role: Dedicated inverting AUX2 controller with FB2=0V reference and INDL2-referenced gate drive for precise negative rail regulation. Use Value: Delivers −7.5V with ±1.5% accuracy over temperature and load, eliminating need for external op-amp compensation or discrete inverter ICs. |
| Multi-Battery Portable Imaging Device | Low-Voltage Camera Module |
|
Use Scenario: Dual-battery camera supporting both 2-cell AA (1.8–3.2V) and single Li+ (2.7–4.2V) inputs without redesign. IC Role / Device Role / Timing Role: Wide-input (0.7–5.5V) architecture with adaptive startup oscillator and Schottky-assisted cold-start capability. Use Value: Achieves reliable startup from 0.9V battery voltage using internal low-voltage oscillator, enabling operation even with deeply discharged alkaline cells. |
Use Scenario: Ultra-compact camera module where board space is constrained to <80mm² and thermal dissipation must stay <0.8W. IC Role / Device Role / Timing Role: Highly integrated QFN-packaged PMIC with exposed thermal pad and optimized internal FET RDS(on) (150/250mΩ). Use Value: Maintains full 5-channel operation at TA = +85°C with ≤0.75W total dissipation, avoiding thermal throttling in sealed enclosures. |
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 |
|---|---|---|---|
| MAX1584ETJ+ | Replaces AUX2 inverter with second step-up controller; FB2 threshold = 1.25V; no negative output capability. | Suitable for designs needing dual positive rails (e.g., +15V + +12V) but not CCD bias; lacks −7.5V generation. | Select MAX1584ETJ+ only if camera uses CMOS sensor or CCD with integrated bias; MAX1585ETJ+ is mandatory for discrete high-current CCD bias. |
| TPS65131RGTR | Dual-output (±15V) inverter IC with integrated charge pump; no step-up/step-down channels; 16-pin QFN; fixed outputs. | Requires external step-up/step-down ICs for main rails; adds ≥3 components and ≥200mm² area; limited to fixed ±15V. | Use TPS65131RGTR only as supplemental inverter alongside separate buck/boost ICs; not a functional replacement for MAX1585ETJ+'s integrated 5-channel architecture. |
Compared with MAX1584ETJ+, MAX1585ETJ+ uniquely supports CCD-specific negative bias via FB2=0V and INDL2-referenced DL2 drive, while TPS65131RGTR offers only fixed dual-rail inversion without system-level power integration-making MAX1585ETJ+ the sole single-chip solution for slim DSCs requiring +5V, +1.8V, +15V, −7.5V, and +3.3V from one Li+ cell.
Availability
MAX1585ETJ+ is available at Aetrix Electronics and suitable for digital camera modules, portable imaging systems, and CCD-based optical sensors requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1585ETJ+ 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 space-constrained, battery-powered applications.
The MAX1585ETJ+ belongs to Maxim's Slim DSC Power Supply product line, designed specifically to replace multi-IC power trees in digital still cameras with a single, sequenced, thermally robust 5-channel PMIC supporting Li+ and alkaline battery chemistries.
FAQ
What is the minimum input voltage required to start up the MAX1585ETJ+?
The MAX1585ETJ+ features an internal low-voltage startup oscillator that begins operation at approximately 0.9V, enabling reliable cold-start from deeply discharged batteries. A Schottky diode from battery to PVSU is required for startup below ~2.5V, as the main control circuitry engages only after PVSU reaches regulation (~2.5V). This behavior is explicitly confirmed in Note 2 and Figure toc08 of the MAX1585ETJ+ datasheet.
How does the MAX1585ETJ+ generate negative voltage for CCD bias?
The MAX1585ETJ+ uses its AUX2 channel as an inverting controller: FB2 has a 0V threshold, DL2 drives a P-channel MOSFET, and INDL2 is connected to the battery to establish correct gate-source voltage. A resistive divider from the −7.5V output to FB2 and REF (1.25V) sets regulation. This topology-documented in Pin Description page 11 and Figure 2-is exclusive to MAX1585ETJ+ and not supported by MAX1584ETJ+.
Can the MAX1585ETJ+ operate without external MOSFETs?
Yes-the MAX1585ETJ+ integrates MOSFETs for its primary step-up and step-down converters (N- and P-channel, 150mΩ/250mΩ typical RDS(on)), enabling complete +5V and +1.8V generation with only inductors and capacitors. However, all three auxiliary controllers (AUX1, AUX2, AUX3) require external MOSFETs, as confirmed in the General Description and Pin Description sections.
What is the purpose of the INDL2 pin on the MAX1585ETJ+?
INDL2 (Pin 25) supplies the gate-drive voltage reference for the AUX2 inverting controller's DL2 output. Unlike MAX1584ETJ+, MAX1585ETJ+ requires INDL2 to be tied to the battery-not PVSU-to ensure the external P-FET fully turns off when DL2 goes high. This configuration prevents shoot-through and is essential for stable −7.5V generation, as specified in the MAX1585ETJ+ Pin Description (page 11) and Functional Diagram (page 13).
Does the MAX1585ETJ+ support independent enable sequencing for each output channel?
No-enable sequencing is hardware-fixed: ONSU must achieve regulation before ONSD, ON1, ON2, and ON3 are released (after 1024 OSC cycles). There is no software or pin-programmable override. This ensures safe power-up order (e.g., +5V before +1.8V core) and prevents latch-up, as detailed in the Applications Information and Pin Description sections of the MAX1585ETJ+ datasheet.
MAX1585ETJ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Controller/Converter, Digital Cameras
- Voltage - Input:
- 0.7V ~ 5.5V
- Number of Outputs:
- 5
- Voltage - Output:
- 1.25V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
MAX1585ETJ+ FAQ
1.How can I place an order for MAX1585ETJ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1585ETJ+ 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 MAX1585ETJ+ reliable?
The price and inventory of MAX1585ETJ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1585ETJ+ is usually 5 days.
3.What payment methods are accepted for MAX1585ETJ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1585ETJ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1585ETJ+?
MAX1585ETJ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1585ETJ+ 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 MAX1585ETJ+?
For technical support, including MAX1585ETJ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1585ETJ+ requirements.
6.How does Aetrix verify that MAX1585ETJ+ is sourced from the original manufacturer or authorized distributors?
All MAX1585ETJ+ 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 MAX1585ETJ+ meets industry standards.
7.What is the process for return or replacement of MAX1585ETJ+?
All MAX1585ETJ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1585ETJ+, 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 MAX1585ETJ+ part is unused and in its original packaging.
Return procedure for MAX1585ETJ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1585ETJ+ Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
