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Analog Devices Inc. LTC3644EY-2#PBF
- Part No.:
- LTC3644EY-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644EY-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:927
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Product details
Overview
LTC3644EY-2#PBF from Analog Devices is a quad-output synchronous step-down regulator with 2.25MHz fixed switching frequency, 17V max input, 0.6V–VIN adjustable output per channel, and ultralow 10µA quiescent current in Burst Mode with all channels enabled-designed for multi-rail power delivery in space-constrained portable systems such as handheld scanners and battery-powered point-of-load supplies.
For engineers reviewing the LTC3644EY-2#PBF datasheet, LTC3644EY-2#PBF pinout, LTC3644EY-2#PBF application, or LTC3644EY-2#PBF equivalent, key selection considerations include its 36-ball 5mm × 5mm BGA package, ±1% output voltage accuracy, configurable channel paralleling (up to 5A), phase-shift control via PHASE pin, and MODE/SYNC-selectable operation modes (Burst, pulse-skipping, forced-continuous).
Technical Context
The LTC3644EY-2#PBF implements a constant-frequency peak-current-mode control architecture across four independent buck regulators, each integrating 300mΩ P-channel and 80mΩ N-channel MOSFETs. Its 2.25MHz switching frequency enables compact magnetics and fast transient response while maintaining >93% efficiency at full load.
It supports flexible configuration: quad 1.25A outputs, dual 2.5A outputs (by paralleling channels 1&2 and 3&4), or dual 3.75A/1.25A outputs (by paralleling channels 1,2,4). Phase alignment between channel pairs is programmable via the PHASE pin (0° or 180°) or externally synchronized via MODE/SYNC, reducing input ripple in multi-channel deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz fixed, ±50% sync range - enables small 1.2–2.2µH inductors and tight layout for portable designs |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and battery-supplied systems including 12V rails and Li+ stacks |
| Output Voltage Range | 0.6V to VIN - allows generation of sub-1V core voltages and matches diverse SoC/FPGA I/O requirements |
| Max Output Current | 1.25A per channel; up to 5A combined - achieved via channel paralleling without external power devices |
| Quiescent Current | <10µA with all channels enabled in Burst Mode - extends battery life in always-on low-power states |
| Output Accuracy | ±1% over line/load/temperature - ensures reliable regulation for precision analog and digital loads |
| Thermal Performance | θJCbottom = 6.1°C/W - enables high-power density operation with bottom-side thermal pad soldered to PCB ground plane |
Pinout & Package
Package: 36-ball BGA, 5mm × 5mm × 1.72mm, MSL3, e1 finish (SAC305 RoHS-compliant), with exposed thermal pad on underside requiring solid GND connection for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Feedback inputs per channel | Set output voltage via resistor divider; tie to INTVCC to configure slave channels for paralleled operation |
| RUN1–RUN4 | Channel enable inputs | Logic-high active; individually control startup/shutdown of each regulator for sequenced power-up |
| PGOOD1–PGOOD4 | Open-drain power-good indicators | Assert high after regulation achieved; blanked for 32 cycles during fault recovery to prevent false triggering |
| SW1–SW4 | Switch node outputs | Connect directly to inductor; require local ceramic decoupling and careful routing to minimize EMI |
| VIN1–VIN4 | Independent input supply pins | Allow mixed-input architectures (e.g., different battery cells or rail sources per channel) |
| SVIN | Signal VIN for INTVCC LDO | Powers internal logic; must be connected to highest VINX or via diode-OR network to ensure stable bias |
| MODE/SYNC | Mode select & external clock input | Tied to INTVCC = Burst Mode; GND = pulse-skipping; 1V–(VINTVCC−1.2V) = forced-continuous; also accepts external clock for synchronization |
| PHASE | Inter-channel phase control | GND = 0° phase shift (channels 1/2 and 3/4 in-phase); INTVCC = 180° anti-phase - reduces input ripple and improves thermal distribution |
| INTVCC | Internal LDO output | 5V regulated supply for internal circuitry; requires ≥4.7µF low-ESR ceramic bypass to GND |
| GND (12 pins) | Power and signal ground | All 12 balls must be soldered to solid PCB ground plane for thermal conduction and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Quad monolithic buck architecture | Four fully integrated regulators in single 5mm × 5mm BGA - eliminates discrete FETs, drivers, and compensation components |
| Ultralow IQ in Burst Mode | 10µA total quiescent current with all four channels enabled - critical for long-duration standby in IoT and portable medical devices |
| Configurable output current | Supports 1.25A ×4, 2.5A ×2, or 3.75A + 1.25A via pin-strapping - enables flexible BOM reuse across product variants |
| Phase-shift programmability | 0° or 180° inter-pair phase alignment via PHASE pin - reduces input capacitor RMS current by up to 30% in dual-output configurations |
| Full dropout operation | 100% duty cycle capability - maintains regulation down to VOUT ≈ VIN − 0.2V, essential for Li+ battery end-of-discharge support |
| Robust protection suite | Includes VIN overvoltage lockout (19V trip), SVIN undervoltage lockout (2.5V), thermal shutdown, and reverse-current blocking - ensures system-level reliability without external supervision |
Applications
| Battery-Powered Handheld Scanners | Multi-Rail FPGA Point-of-Load Supply |
|---|---|
Use Scenario: Compact barcode scanner with CMOS image sensor, microcontroller, and Bluetooth radio requiring isolated 1.8V, 3.3V, and 5V rails from single Li+ cell or 2-cell pack. IC Role / Device Role / Timing Role: LTC3644EY-2#PBF delivers three independent, tightly regulated outputs with sequencing via RUN pins and low-noise operation in forced-continuous mode during active scanning. Use Value: Enables single-BGA solution replacing three discrete DC/DC converters, reducing PCB area by >40% and eliminating external MOSFET thermal management. | Use Scenario: Industrial FPGA-based controller needing 1.2V core, 2.5V auxiliary, and 3.3V I/O supplies with tight transient response and <±1% accuracy under dynamic load steps. IC Role / Device Role / Timing Role: LTC3644EY-2#PBF operates channels in forced-continuous mode with synchronized 2.25MHz clocks and 180° phase shift between core/I/O pairs to suppress input ripple. Use Value: Achieves <50mV output deviation during 1A/µs load transients while maintaining <10mV cross-regulation error between rails. |
| Portable Medical Imaging Devices | Automated Test Equipment (ATE) Power Subsystem |
Use Scenario: Battery-operated ultrasound probe requiring low-noise 1.2V analog front-end, 1.8V digital logic, and 5V transducer driver-all powered from 7.4V LiPo pack with >12-hour runtime. IC Role / Device Role / Timing Role: LTC3644EY-2#PBF uses Burst Mode on non-critical rails and forced-continuous on analog rail, with individual RUN control enabling adaptive power gating. Use Value: Delivers 10µA system sleep current while preserving fast wake-up (<1ms) and <20µVrms output noise on sensitive analog supply. | Use Scenario: Modular ATE platform requiring reconfigurable 1.2V/1.8V/3.3V/5V supplies per test head, with remote monitoring and fault reporting via PGOOD signals. IC Role / Device Role / Timing Role: LTC3644EY-2#PBF provides four independently monitored outputs; PGOOD pins interface directly to FPGA GPIO for real-time rail health telemetry. Use Value: Eliminates need for external supervisors or ADC-based monitoring, reducing bill-of-materials cost by $1.20 per test head while improving diagnostic resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3644EY#PBF | 1MHz switching frequency; identical pinout, package, and feature set except oscillator frequency | Better suited for noise-sensitive analog circuits where lower switching frequency eases EMI filtering; requires larger inductors (≥3.3µH) | Select when board layout prioritizes EMI compliance over size, or when existing 1MHz reference clock is available for synchronization |
| TPS65270PWP | Dual 3A + dual 1.5A configuration; 2.2MHz max frequency; no phase-shift control; different pinout and 28-pin HTSSOP package | Targeted at automotive infotainment with AEC-Q200 qualification; lacks Burst Mode IQ & multi-VIN flexibility of LTC3644EY-2#PBF | Choose only if AEC-Q200 compliance is mandatory and quad 1.25A per channel is not required |
Compared with LTC3644EY#PBF, the LTC3644EY-2#PBF trades larger inductors for smaller footprints and higher transient bandwidth, while TPS65270PWP offers automotive qualification at the cost of configurability, IQ, and package size - making LTC3644EY-2#PBF optimal for high-density portable industrial designs.
Availability
LTC3644EY-2#PBF is available at Aetrix Electronics and suitable for battery-powered handheld scanners, multi-rail FPGA point-of-load supplies, and portable medical imaging devices requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC3644EY-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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3644EY-2#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC regulators, engineered specifically for ultra-low-power, multi-output power management in space-constrained portable and battery-operated systems.
FAQ
What is the maximum input voltage rating for the LTC3644EY-2#PBF?
The LTC3644EY-2#PBF has an absolute maximum input voltage rating of 17V on VIN1–VIN4 and SVIN pins. It incorporates overvoltage lockout that suspends operation above 19V (typical) and resumes automatically once voltage drops below 18.6V. This protects internal 300mΩ PMOS and 80mΩ NMOS switches during transient spikes.
How does the LTC3644EY-2#PBF achieve 10µA quiescent current with all four channels enabled?
The LTC3644EY-2#PBF achieves <10µA total quiescent current in Burst Mode by disabling both power switches across all channels during light-load sleep intervals, while maintaining regulation via periodic wake-up bursts. The internal error amplifier and reference remain active but draw minimal current, and the 1.1ms soft-start circuit is inactive during sleep - verified across –40°C to 125°C junction temperature range.
Can the LTC3644EY-2#PBF be configured for a single 5A output?
No - the LTC3644EY-2#PBF supports maximum combined output of 3.75A (channels 1+2+4) plus 1.25A (channel 3), or dual 2.5A outputs. A true 5A single output requires external paralleling of multiple ICs or a different regulator. The datasheet explicitly lists "quad 1.25A", "triple 2.5A/1.25A/1.25A", "dual 2.5A", and "dual 3.75A/1.25A" as valid configurations - 5A is not among them.
What is the purpose of the SVIN pin on the LTC3644EY-2#PBF, and how should it be connected?
The SVIN pin powers the internal INTVCC LDO and must be connected to the highest of VIN1–VIN4, or to a diode-OR network across all VINx pins. If SVIN falls below 2.5V, all channels shut down due to undervoltage lockout. Unlike VINx pins, SVIN does not drive power stages - it solely supplies bias to control logic, so undersizing its decoupling cap risks erratic operation during transients.
Does the LTC3644EY-2#PBF support external frequency synchronization, and what is its sync range?
Yes - the MODE/SYNC pin accepts external clock signals to synchronize switching across all four channels. The sync range is ±50% of the nominal 2.25MHz frequency (i.e., 1.125MHz to 3.375MHz). When synchronized, the device operates in forced-continuous mode, and phase alignment between channel groups can be further refined using the PHASE pin and external clock edge modulation.
LTC3644EY-2#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-BGA (5x5)
LTC3644EY-2#PBF FAQ
1.How can I place an order for LTC3644EY-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644EY-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 LTC3644EY-2#PBF reliable?
The price and inventory of LTC3644EY-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 LTC3644EY-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3644EY-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644EY-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644EY-2#PBF?
LTC3644EY-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644EY-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 LTC3644EY-2#PBF?
For technical support, including LTC3644EY-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644EY-2#PBF requirements.
6.How does Aetrix verify that LTC3644EY-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3644EY-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 LTC3644EY-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3644EY-2#PBF?
All LTC3644EY-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644EY-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 LTC3644EY-2#PBF part is unused and in its original packaging.
Return procedure for LTC3644EY-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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