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Analog Devices Inc. LTC3589EUJ-2#PBF
- Part No.:
- LTC3589EUJ-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3589EUJ-2#PBF.pdf
- Description:
- IC DC/DC CONV 8-OUTPUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:205
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Product details
Overview
LTC3589EUJ-2#PBF from Analog Devices (formerly Linear Technology) is a multirail power management IC for ARM-based processors, integrating three step-down DC/DC converters (1.6A, 1A, 1A), one 1.2A buck-boost regulator (1.8V–5V), three 250mA LDOs, and an always-on 25mA LDO. It supports i.MX53/51, PXA, and OMAP platforms with I²C-controlled dynamic voltage scaling, sequencing, and pushbutton system control.
For engineers reviewing the LTC3589EUJ-2#PBF datasheet, LTC3589EUJ-2#PBF pinout, LTC3589EUJ-2#PBF application, or LTC3589EUJ-2#PBF equivalent, key selection criteria include its 40-pin 6mm × 6mm QFN package, –40°C to 125°C operating range, I²C-addressable rail configuration, VSTB-triggered multi-rail standby mode, and integrated fault reporting via PGOOD/RSTO/IRQ pins.
Technical Context
The LTC3589EUJ-2#PBF implements a hierarchical power architecture: three independent synchronous buck regulators (Buck1–Buck3) with programmable output voltages (0.36V–VIN), a four-switch buck-boost regulator (BB_OUT) supporting 1.8V–5V outputs, and four LDOs-including a dedicated always-on LDO1_STBY (0.76V–0.84V FB, 25mA). All rails support soft-start, slew-rate control, and I²C-based dynamic voltage scaling.
Sequencing is implemented via either hardware pin-strapping (ENx, VSTB, PWR_ON) or I²C register writes, enabling precise power-up/down order across eight regulated outputs. The device includes integrated pushbutton interface logic (ON, PBSTAT, WAKE), undervoltage lockout (2.65V rising), and thermal shutdown (TJ = 150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VIN = 2.7V to 5.5V - supports single-cell Li-ion, USB, or wide-input industrial supplies. |
| Standby Current | 8µA typical - enables ultra-low-power system sleep states without external enable circuitry. |
| Switching Frequency | Selectable 1.12MHz or 2.25MHz - allows optimization of efficiency vs. size using smaller inductors at higher frequency. |
| Buck1 Current Limit | 2.0A to 2.7A peak - ensures robust operation under transient load steps up to 1.6A continuous at core rail. |
| Buck-Boost Output Range | 1.8V to 5.0V - powers variable-voltage I/O interfaces (e.g., SDIO, USB PHY, display bias) from a single regulator. |
| I²C Address | 0x68 (write), 0x69 (read) - standard 7-bit addressing compatible with most microcontroller I²C masters. |
| LDO1_STBY Output | Always-on 25mA LDO with 0.8V feedback reference - maintains RTC, backup registers, or wake logic during full system shutdown. |
Pinout & Package
Package: 40-pin 6mm × 6mm × 0.75mm exposed-pad QFN (UJ-40). Exposed pad (Pin 41) is GND and must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_LDO2 (1) | LDO2 input supply | Separate input for LDO2; decoupled independently to reduce noise coupling into analog rails. |
| LDO2 (2) | LDO2 regulated output | 250mA low-noise output; voltage set via I²C DAC and external resistor divider. |
| LDO3 (3) | LDO3 regulated output | 250mA fixed-output LDO (1.8V for LTC3589EUJ-2#PBF); used for memory or peripheral analog supplies. |
| LDO4 (4) | LDO4 regulated output | 250mA I²C-programmable LDO (1.2V–3.3V); supports flexible I/O voltage assignment. |
| VIN_LDO34 (5) | LDO3/LDO4 common input | Shared input for LDO3/LDO4; requires local 1µF ceramic bypass for stability. |
| PVIN1–PVIN4 (6,22,24,30) | Buck/Buck-Boost input supplies | Independent input pins per switching regulator - enables optimal layout and source isolation. |
| SW1–SW3 (7,23,25) | Buck converter switch nodes | Connect to external inductors; require low-ESR ceramic output capacitors (22µF typical). |
| SW4AB/SW4CD (31,39) | Buck-boost switch nodes | Four-phase switching terminals for buck-boost topology; require careful layout to minimize shoot-through risk. |
| BB_OUT (40) | Buck-boost output | Main 1.8V–5V output; supports dynamic voltage scaling via I²C-controlled feedback DAC. |
| VSTB (13) | Standby toggle control | Simultaneously switches up to four rails between run and standby voltages - critical for fast low-power state transitions. |
| PWR_ON (32) | Power-on trigger | Edge-sensitive input initiating full power-up sequence; debounced internally with 2ms response time. |
| ON (18) | Pushbutton interface | Dual-function pin: momentary ON activation and hard reset initiation after 5s hold. |
| PGOOD (12) | Power-good status | Open-drain output asserting when all enabled rails are within ±6% of target - used for processor reset synchronization. |
| RSTO (8) | Reset output | Active-low reset signal with programmable delay; asserts on UVLO, overtemperature, or watchdog timeout. |
| IRQ (29) | Interrupt request | Open-drain interrupt signaling fault conditions (e.g., overcurrent, thermal warning, LDO dropout). |
| SCL/SDA (15,20) | I²C serial interface | Standard 400kHz I²C bus; supports rail configuration, monitoring, and real-time DVS updates. |
Key Features
| Feature | Design Value |
|---|---|
| Triple I²C-adjustable buck regulators | Enables independent, software-defined core/memory/SoC rail voltages with 12.5mV LSB resolution and 0.36V–VIN range. |
| Buck-boost I/O regulator | Eliminates need for separate boost/buck converters for variable I/O voltages (e.g., 1.8V/2.5V/3.3V/5V SD card, USB, display interfaces). |
| VSTB multi-rail toggle | Reduces standby power by synchronously lowering up to four rails to preconfigured low-voltage states without I²C transaction overhead. |
| Integrated pushbutton controller | Replaces discrete RC debounce + logic circuits; provides ON/WAKE/PBSTAT timing with factory-trimmed accuracy (±10% on tON_WAKE). |
| Always-on LDO1_STBY | Maintains critical subsystems (RTC, wake logic, backup RAM) during deep sleep - draws only 8µA total system standby current. |
| Hardware + I²C sequencing | Supports both deterministic pin-strapped startup order and dynamic reconfiguration via register writes - essential for adaptive power policies. |
Applications
| Handheld Instruments and Scanners | Portable Industrial Devices |
|---|---|
Use Scenario: Battery-powered handheld barcode scanners requiring rapid wake-from-sleep, low-noise analog sensor supplies, and variable I/O voltage for different communication interfaces. IC Role / Device Role / Timing Role: Central power manager coordinating core processor (Buck1), image sensor bias (LDO2), memory (LDO3), and USB/RS-232 interface (BB_OUT). Use Value: VSTB pin reduces active-to-standby transition time to <100ms while maintaining RTC and wake logic via LDO1_STBY. | Use Scenario: Ruggedized portable HMI panels with ARM Cortex-A8 processor, touchscreen controller, and isolated CAN/RS-485 transceivers. IC Role / Device Role / Timing Role: Multirail PMIC delivering 1.2V core, 3.3V I/O, 2.8V display backlight, and 5V CAN transceiver supply with synchronized sequencing. Use Value: Hardware-enforced power-up order prevents latch-up in mixed-voltage peripherals; BB_OUT supplies 5V from 3.7V Li-ion without external boost stage. |
| Automotive Infotainment | Medical Devices |
Use Scenario: In-vehicle navigation units with quad-core application processor, audio codec, GPS receiver, and LCD display - operating across automotive temperature range. IC Role / Device Role / Timing Role: Primary power controller managing CPU core (Buck1), GPU (Buck2), DDR memory (Buck3), audio LDOs (LDO2/LDO3), and display bias (BB_OUT). Use Value: –40°C to 125°C rated operation ensures reliability in under-dash environments; I²C monitoring enables runtime thermal derating. | Use Scenario: Portable ultrasound imaging systems requiring ultra-low-noise analog front-end supplies, high-efficiency battery operation, and fail-safe power sequencing. IC Role / Device Role / Timing Role: Safety-critical PMIC providing isolated LDO2/LDO3 for ADC reference and op-amp bias, with PGOOD/RSTO ensuring clean processor reset on rail faults. Use Value: Integrated fault reporting (IRQ) and programmable UVLO (2.65V) prevent brownout-induced data corruption during battery discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multirail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS659122ZQV | TI PMIC with 4 buck, 5 LDO, but no integrated buck-boost; I²C address fixed at 0x58; max junction temp 105°C. | Requires external boost converter for >3.6V I/O rails; lacks VSTB-style multi-rail toggle; lower thermal rating limits high-ambient use. | Choose if system uses only ≤3.3V I/O and prioritizes TI ecosystem compatibility over buck-boost integration. |
| MAX20029ATI+ | Maxim PMIC with 3 buck, 3 LDO, integrated 1.2A buck-boost, but no always-on LDO; I²C address 0x60; operates to 125°C. | Missing dedicated 25mA always-on LDO - requires external RTC supply; fewer LDOs limit analog rail flexibility. | Choose if VSTB functionality is unnecessary and system can tolerate external RTC power path. |
Compared with TPS659122ZQV and MAX20029ATI+, the LTC3589EUJ-2#PBF uniquely combines buck-boost I/O regulation, VSTB multi-rail standby control, and an always-on LDO in a single 40-pin QFN - reducing BOM count and PCB area while enabling faster low-power state transitions.
Availability
LTC3589EUJ-2#PBF is available at Aetrix Electronics and suitable for handheld instruments and scanners, portable industrial devices, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3589EUJ-2#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3589EUJ-2#PBF belongs to the Linear Technology Power Management IC product line, designed specifically for advanced portable microprocessor systems requiring tightly coordinated, software-configurable multirail power delivery with minimal external components.
FAQ
What is the maximum output current capability of the buck-boost regulator in the LTC3589EUJ-2#PBF?
The LTC3589EUJ-2#PBF buck-boost regulator (BB_OUT) delivers up to 1.2A continuous output current. Its peak PMOS current limit is specified at 2.3A to 2.9A, and it supports forward burst current up to 600mA and reverse current limiting at 1A - enabling robust handling of transient loads in I/O interfaces like USB or display drivers.
How does the VSTB pin function in the LTC3589EUJ-2#PBF, and which rails does it control?
The VSTB pin in the LTC3589EUJ-2#PBF simultaneously toggles up to four preconfigured rails (typically Buck1, Buck2, Buck3, and BB_OUT) between their programmed run and standby output voltages. This hardware-assisted feature enables sub-100ms entry/exit from low-power states without I²C bus traffic, preserving system responsiveness while minimizing quiescent power.
Does the LTC3589EUJ-2#PBF support dynamic voltage scaling (DVS), and how is it implemented?
Yes, the LTC3589EUJ-2#PBF supports dynamic voltage scaling across all three buck regulators and the buck-boost regulator via its I²C interface. DVS is implemented using internal 5-bit DACs controlling each regulator's feedback reference; voltage changes are slew-rate limited to prevent output overshoot, with programmable slew rates configurable per rail.
What is the purpose of the LDO1_STBY regulator in the LTC3589EUJ-2#PBF, and what are its key specifications?
The LDO1_STBY regulator in the LTC3589EUJ-2#PBF is an always-on 25mA LDO with a 0.8V feedback reference (±5% tolerance), 200mV dropout at 25mA/3.3V output, and 8µA total system standby current contribution. It maintains RTC, backup registers, and wake logic during full system shutdown - a critical feature for fast wake-up in battery-powered applications.
Can the LTC3589EUJ-2#PBF be used in automotive applications, and what temperature grade does it support?
Yes, the LTC3589EUJ-2#PBF is qualified for automotive infotainment use with an operating junction temperature range of –40°C to 125°C. Its E-grade rating (LTC3589EUJ-2#PBF) meets AEC-Q100 stress test requirements for ambient temperatures up to 105°C in under-hood or dashboard-mounted systems, supported by integrated thermal shutdown and UVLO protection.
LTC3589EUJ-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Handheld/Mobile Devices, OMAP™
- Current - Supply:
- 8µA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3589EUJ-2#PBF FAQ
1.How can I place an order for LTC3589EUJ-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3589EUJ-2#PBF 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 LTC3589EUJ-2#PBF reliable?
The price and inventory of LTC3589EUJ-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3589EUJ-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3589EUJ-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3589EUJ-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3589EUJ-2#PBF?
LTC3589EUJ-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3589EUJ-2#PBF 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 LTC3589EUJ-2#PBF?
For technical support, including LTC3589EUJ-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3589EUJ-2#PBF requirements.
6.How does Aetrix verify that LTC3589EUJ-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3589EUJ-2#PBF 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 LTC3589EUJ-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3589EUJ-2#PBF?
All LTC3589EUJ-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3589EUJ-2#PBF, 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 LTC3589EUJ-2#PBF part is unused and in its original packaging.
Return procedure for LTC3589EUJ-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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