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Analog Devices Inc. LTC3644IY#PBF
- Part No.:
- LTC3644IY#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644IY#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:504
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Product details
Overview
LTC3644IY#PBF from Analog Devices is a quad-channel, 1.25A per channel synchronous step-down regulator with fixed 1MHz switching frequency, 2.7V–17V input range, and adjustable 0.6V–VIN output. It integrates 300mΩ P-Channel and 80mΩ N-Channel MOSFETs, supports parallel configurations up to 5A, and delivers ultralow 10µA quiescent current in Burst Mode with all channels enabled - ideal for battery-powered handheld scanners and portable point-of-load supplies.
For engineers reviewing the LTC3644IY#PBF datasheet, LTC3644IY#PBF pinout, LTC3644IY#PBF application, or LTC3644IY#PBF equivalent, key selection criteria include its quad-output configurability (1.25A/2.5A/3.75A/5A), ±1% output voltage accuracy, phase-shift control via PHASE pin, 5mm × 5mm BGA package, and support for forced-continuous, Burst Mode, and pulse-skipping operation modes.
Technical Context
The LTC3644IY#PBF employs peak-current-mode control with internal slope compensation, enabling stable operation across 0–100% duty cycle including full dropout. Its four independent buck channels share a common oscillator but support programmable phase alignment (0° or 180°) between channel pairs via the PHASE pin to reduce input ripple.
Each channel features dedicated RUN, FB, SW, and PGOOD pins, with configurable slave mode (FBx tied to INTVCC) for combined outputs. The MODE/SYNC pin selects operating mode - Burst Mode (MODE/SYNC = INTVCC), pulse-skipping (MODE/SYNC = GND), or forced-continuous (1V < MODE/SYNC < VINTVCC − 1.2V) - while also accepting external clock synchronization over ±50% of nominal frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide industrial and battery-input systems without pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables precise low-voltage core rails (e.g., 1.8V, 2.5V, 3.3V) and high-efficiency intermediate bus conversion. |
| Max Output Current per Channel | 1.25A - scalable to 2.5A (dual), 3.75A (triple), or 5A (quad-parallel) via shared SW/FB/VIN routing. |
| Quiescent Current (All Channels) | <10µA in Burst Mode - extends battery life in always-on portable devices with intermittent load profiles. |
| Feedback Reference Voltage | 0.6V ±1% - ensures tight output regulation accuracy across temperature and line/load variations. |
| Switching Frequency | 1.00MHz (fixed) - enables compact magnetics (e.g., 3.3µH–6.8µH) and high-frequency noise filtering. |
| Package | 36-ball BGA, 5mm × 5mm × 1.72mm - space-constrained PCB layout with thermal performance θJCbottom = 6.1°C/W. |
Pinout & Package
36-ball BGA package (5mm × 5mm × 1.72mm) with bottom-side thermal pad; requires controlled-impedance PCB layout and reflow per JESD51-5/7 guidelines. Pin assignment optimized for thermal dissipation and signal isolation: 12 dedicated GND balls distributed across array, SVIN and INTVCC decoupled separately, and RUN/PGOOD pins placed adjacent to respective channel SW/FB for minimal trace length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Per-channel feedback input | Connects to resistor divider tap; sets VOUT = 0.6V × (1 + R2/R1); tie to INTVCC to configure slave channel. |
| RUN1–RUN4 | Per-channel enable input | Logic-high active; must not float; controls individual channel startup/shutdown for power sequencing. |
| SW1–SW4 | Per-channel switch node | Connects to inductor; carries high di/dt; requires short, low-inductance routing to minimize EMI and ringing. |
| PGOOD1–PGOOD4 | Per-channel open-drain status flag | Pulled high when VOUT within ±7.5%; 32-cycle blanking prevents false triggers during transients. |
| MODE/SYNC | Mode select & external clock input | Selects Burst Mode (INTVCC), pulse-skipping (GND), or forced-continuous (1V–VINTVCC−1.2V); accepts external sync clock. |
| PHASE | Inter-channel phase control | Tie to GND for 0° shift (channels 1/2 & 3/4 in-phase); tie to INTVCC for 180° shift to reduce input ripple. |
| SVIN | Signal supply input | Powers INTVCC LDO; must be connected to highest VINx or via diode-OR network to ensure stable gate drive. |
| INTVCC | Internal LDO output | 5V regulated supply for logic; bypass with ≥4.7µF ceramic capacitor to GND for stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel integration with independent control | Eliminates four discrete regulators and associated passives - reduces board area by >40% vs. discrete solutions. |
| Ultralow IQ & Burst Mode operation | 10µA total quiescent current with all channels enabled - enables multi-week standby in coin-cell–powered IoT sensors. |
| Configurable output current scaling | Supports 1.25A (quad), 2.5A (dual), 3.75A (triple), or 5A (full parallel) using single inductors per output rail. |
| Phase-shift programmability | 0° or 180° inter-pair phase alignment reduces input capacitor RMS current and eases EMI filter design. |
| Full dropout operation | Maintains regulation down to 100% duty cycle - critical for Li-ion battery discharge down to 3.0V while powering 3.3V rails. |
Applications
| Battery-Powered Handheld Scanners | Portable Medical Imaging Devices |
|---|---|
Use Scenario: Compact barcode scanner with CMOS image sensor, microcontroller, and Bluetooth radio operating from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Quad-output DC/DC providing 1.2V core, 1.8V sensor, 3.3V MCU I/O, and 5V USB interface - each independently sequenced and monitored. Use Value: 10µA quiescent current extends battery life beyond 120 hours in sleep mode; 1MHz switching enables use of 3.3µH shielded inductors under 3mm height. |
Use Scenario: Portable ultrasound probe requiring low-noise analog front-end (AFE), FPGA, and display driver from 3.7V polymer battery. IC Role / Device Role / Timing Role: Four regulated rails: 1.2V FPGA core, 2.5V AFE bias, 3.3V digital I/O, and 5V display backlight - with phase-shifted switching to suppress conducted EMI into sensitive analog paths. Use Value: ±1% output accuracy ensures consistent AFE gain calibration; 180° phase shift between channel pairs cuts input ripple by 30% vs. in-phase operation. |
| Industrial Point-of-Load Supplies | Automotive Infotainment Power Management |
Use Scenario: DIN-rail mounted PLC module with isolated CAN, Ethernet PHY, and ARM Cortex-M7 processor. IC Role / Device Role / Timing Role: Configured as dual 2.5A outputs (core + I/O) and dual 1.25A outputs (peripheral + interface) - sharing inductors to minimize component count. Use Value: Integrated 300mΩ/80mΩ MOSFETs achieve 93% efficiency at 1.25A/5V, reducing thermal load vs. external FET solutions; 17V max input withstands 24V rail transients. |
Use Scenario: In-vehicle head unit with quad-core SoC, touchscreen controller, audio codec, and GPS receiver powered from 12V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Delivers 0.85V SoC core, 1.1V GPU, 3.3V peripherals, and 5V USB - with RUN pin sequencing aligned to automotive boot requirements. Use Value: 2.7V–17V input range survives cold-crank dips to 2.7V and load-dump spikes to 17V; ±7.5% PGOOD window ensures reliable system reset signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4485GL-AEC1-Z | Automotive-grade (AEC-Q100 Grade 1), 2.5A per channel, 2.5–18V input, 2.2MHz fixed frequency, no phase-shift control. | Targeted for automotive infotainment where AEC-Q100 qualification is mandatory; lacks configurable multi-output scaling. | Choose MPQ4485GL-AEC1-Z only if AEC-Q100 compliance is required and 2.5A/channel suffices without parallelization. |
| TPS54560QDGQRQ1 | Single-channel, 5A, 3.5–60V input, 100kHz–2.5MHz adjustable frequency, no integrated MOSFETs (external FETs required). | Requires external high-side/low-side FETs and gate drivers; suitable for high-input industrial systems but not space-constrained portable designs. | Choose TPS54560QDGQRQ1 only for >18V input applications where LTC3644IY#PBF's 17V limit is insufficient. |
Compared with MPQ4485GL-AEC1-Z and TPS54560QDGQRQ1, the LTC3644IY#PBF uniquely combines quad-channel integration, 1.25A scalability to 5A, 10µA quiescent current, and 0°/180° phase control - making it optimal for compact, battery-sensitive, multi-rail embedded systems where BOM count and standby power dominate selection criteria.
Availability
LTC3644IY#PBF is available at Aetrix Electronics and suitable for battery-powered handheld scanners, portable medical imaging devices, industrial PLCs, and automotive infotainment systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC3644IY#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and healthcare markets.
The LTC3644 product line delivers highly integrated, low-quiescent-current DC/DC regulators for space- and power-constrained applications - designed specifically for portable, battery-operated, and multi-rail embedded systems demanding efficiency, configurability, and reliability.
FAQ
What is the maximum input voltage rating for the LTC3644IY#PBF?
The LTC3644IY#PBF has an absolute maximum input voltage rating of 17V on all VINx and SVIN pins. Operation above 17V risks permanent damage. The device includes VIN overvoltage lockout that suspends switching when any VINx exceeds 19V (rising threshold), resuming automatically once voltage drops below 18.6V. This protection applies independently per channel.
Can the LTC3644IY#PBF be configured for a single 5A output?
Yes, the LTC3644IY#PBF supports a 5A output configuration by paralleling all four channels: connect VIN1–VIN4 together, SW1–SW4 together, and FB2–FB4 to INTVCC (making channels 2–4 slaves to channel 1). The PHASE pin must be tied to GND for 0° phase alignment. Peak current limit scales to 4.4A (typical) in this mode, delivering up to 5A continuous with proper thermal design.
How does the MODE/SYNC pin affect efficiency and ripple in the LTC3644IY#PBF?
The MODE/SYNC pin directly determines operating mode: tied to INTVCC enables Burst Mode (highest light-load efficiency, ~10µA IQ, higher ripple); tied to GND enables pulse-skipping (moderate efficiency, lower ripple than Burst Mode); biased between 1V and VINTVCC−1.2V enables forced-continuous mode (lowest ripple, constant 1MHz switching, reduced efficiency at light loads). Each mode is mutually exclusive and verified in the LTC3644IY#PBF datasheet.
What is the purpose of the PHASE pin on the LTC3644IY#PBF?
The PHASE pin configures timing alignment between channel pairs: tied to GND sets 0° phase shift (channels 1/2 and 3/4 switching simultaneously), while tied to INTVCC sets 180° phase shift (reducing input capacitor RMS current and input ripple by up to 30%). For 5A configurations, PHASE must be grounded. External clock modulation on MODE/SYNC can further refine phase offset when PHASE = INTVCC.
Does the LTC3644IY#PBF support output voltage tracking during startup?
No, the LTC3644IY#PBF does not include built-in voltage tracking circuitry. Each channel has independent soft-start (1.1ms internal ramp) and RUN pin control, allowing external sequencing via staggered RUN signals or RC delays. Tracking must be implemented externally using discrete components or a dedicated supervisor IC coordinating multiple RUN inputs.
LTC3644IY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-FBGA
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17V
- Current - Output:
- 1.25A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-BGA (5x5)
LTC3644IY#PBF FAQ
1.How can I place an order for LTC3644IY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644IY#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 LTC3644IY#PBF reliable?
The price and inventory of LTC3644IY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3644IY#PBF is usually 5 days.
3.What payment methods are accepted for LTC3644IY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644IY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644IY#PBF?
LTC3644IY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644IY#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 LTC3644IY#PBF?
For technical support, including LTC3644IY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644IY#PBF requirements.
6.How does Aetrix verify that LTC3644IY#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3644IY#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 LTC3644IY#PBF meets industry standards.
7.What is the process for return or replacement of LTC3644IY#PBF?
All LTC3644IY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644IY#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 LTC3644IY#PBF part is unused and in its original packaging.
Return procedure for LTC3644IY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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