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Analog Devices Inc. LTC3644IY-2#PBF
- Part No.:
- LTC3644IY-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644IY-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:761
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Product details
Overview
LTC3644IY-2#PBF from Analog Devices is a quad-output synchronous step-down regulator with 2.25MHz fixed switching frequency, supporting 1.25A per channel across 2.7V–17V input and 0.6V–VIN adjustable output. It integrates 300mΩ P-channel and 80mΩ N-channel MOSFETs, delivers up to 93% efficiency, and operates in Burst Mode with <10µA quiescent current (all channels enabled) for battery-powered portable scanners and handheld cameras.
For engineers reviewing the LTC3644IY-2#PBF datasheet, LTC3644IY-2#PBF pinout, LTC3644IY-2#PBF application, or LTC3644IY-2#PBF equivalent, key selection considerations include its 2.25MHz ±50% synchronization range, phase-shift programmability via PHASE/MODE pins, ±1% output voltage accuracy, and configurable multi-channel current sharing (e.g., dual 2.5A or triple 2.5A/1.25A/1.25A).
Technical Context
The LTC3644IY-2#PBF implements a constant-frequency peak-current-mode control architecture with internal slope compensation, enabling stable operation up to 100% duty cycle during dropout. Each channel features independent RUN control, FB-based 0.6V reference regulation, and open-drain PGOOD monitoring with ±7.5% window and 32-cycle blanking delay.
It supports three operating modes selected via MODE/SYNC: Burst Mode (MODE/SYNC = INTVCC, IQ < 10µA), pulse-skipping (MODE/SYNC = GND), and forced-continuous (1V ≤ MODE/SYNC ≤ VINTVCC – 1.2V). Phase relationship between Channel 1/2 and Channel 3/4 is set by PHASE pin (0° or 180°) or modulated externally via clock edges on MODE/SYNC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz fixed, ±50% external sync range - enables compact magnetics and high transient response in space-constrained PoL designs. |
| Output Current per Channel | 1.25A continuous - supports quad 1.25A, dual 2.5A, or triple 2.5A/1.25A/1.25A configurations using shared inductors and FB pin tying. |
| Input Voltage Range | 2.7V to 17V - accommodates wide-input industrial and battery-supplied systems including 12V rails and Li-ion stacks. |
| Output Voltage Range | 0.6V to VIN - enables low-voltage core supplies (e.g., 1.8V, 2.5V, 3.3V) and high-efficiency buck conversion down to sub-1V logic domains. |
| Quiescent Current | <10µA (all channels in Burst Mode) - extends battery life in always-on portable devices without compromising startup time. |
| Feedback Reference Voltage | 0.6V ±1% - ensures precise output regulation across temperature and load, critical for FPGA, ASIC, and microprocessor core supplies. |
| Integrated MOSFETs | 300mΩ P-ch / 80mΩ N-ch - eliminates external power switches, reduces BOM count, and achieves ≥93% peak efficiency at 12VIN/5VOUT. |
Pinout & Package
Package: 36-ball BGA, 5mm × 5mm × 1.72mm, MSL Level 3, RoHS-compliant SAC305 finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Channel feedback inputs | Connect resistor divider tap to set VOUT = 0.6V × (1 + R2/R1); tie FB2/FB3 to INTVCC to configure slave channels for combined outputs. |
| RUN1–RUN4 | Channel enable inputs | Logic-high active; each independently controls channel startup/shutdown - enables dynamic power sequencing and rail gating. |
| SW1–SW4 | Switch node outputs | Connect to inductor; high dv/dt nodes requiring tight layout and ground plane isolation to minimize EMI and crosstalk. |
| PGOOD1–PGOOD4 | Open-drain power-good indicators | Pull high when VOUT is within ±7.5%; 32-cycle blanking prevents false trips during load transients. |
| MODE/SYNC | Mode select & external clock input | Selects Burst Mode (INTVCC), pulse-skipping (GND), or forced-continuous (1V–VINTVCC–1.2V); accepts external clock for synchronization and phase modulation. |
| PHASE | Channel pair phase control | Tie to GND for 0° (in-phase) or INTVCC for 180° (anti-phase) between Ch1/Ch2 and Ch3/Ch4 - reduces input ripple and improves thermal distribution. |
| SVIN | Signal VIN supply | Powers INTVCC LDO; must be connected to highest VINx or via diode-OR network - ensures stable gate drive under mismatched input conditions. |
| GND (12 pins) | Power & signal ground | All 12 GND balls must be soldered to solid PCB ground plane - required for rated thermal performance (θJCbottom = 6.1°C/W) and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | <10µA with all four channels enabled in Burst Mode - enables multi-rail always-on systems with >1-year battery life in standby. |
| Configurable multi-output topology | Supports quad 1.25A, dual 2.5A, triple 2.5A/1.25A/1.25A, or dual 3.75A/1.25A via pin-strapping - reduces component count and board area vs discrete regulators. |
| Phase-shift programmability | 0° or 180° fixed phase, plus externally modulated phase via MODE/SYNC clock edges - minimizes input capacitor RMS current and eases EMI filtering. |
| Full dropout operation | 100% duty cycle capability with maintained 2.2A peak current limit - sustains regulation as input drops to near output voltage (e.g., 3.6V→3.3V Li-ion discharge). |
| Integrated power MOSFETs | 300mΩ P-ch / 80mΩ N-ch per channel - eliminates external FETs and drivers, simplifies layout, and guarantees matched timing and thermal coupling. |
Applications
| Handheld Medical Scanners | Industrial IoT Edge Nodes |
|---|---|
Use Scenario: Compact, battery-operated ultrasound or barcode scanners requiring multiple regulated rails (e.g., 3.3V analog front-end, 1.8V digital core, 5V sensor interface). IC Role / Device Role / Timing Role: Quad-output point-of-load regulator delivering independent, sequenced, and monitored DC supplies from single Li-ion or 12V input. Use Value: Eliminates four discrete buck ICs and associated passives, reducing solution size by >40% while maintaining <10µA system sleep current. |
Use Scenario: Remote sensor gateway with ARM Cortex-M7 MCU, RF transceiver (LoRa/Bluetooth), precision ADC, and isolated CAN interface - all demanding clean, stable, and independently controllable supplies. IC Role / Device Role / Timing Role: Centralized power management IC providing 1.25A rails at 1.2V (core), 3.3V (I/O), 2.5V (ADC), and 5V (transceiver), with RUN pin sequencing and PGOOD status reporting. Use Value: Enables deterministic power-up sequence, real-time rail health monitoring via PGOOD, and adaptive light-load efficiency via Burst Mode - critical for unattended field deployment. |
| Portable Test Equipment | Automotive Infotainment Subsystem |
Use Scenario: Handheld oscilloscope or multimeter with color LCD, touch controller, high-speed ADC, and USB-C PD interface - requiring low-noise, tightly regulated, and dynamically scalable supplies. IC Role / Device Role / Timing Role: Multi-channel synchronous buck regulator supplying 1.8V (FPGA fabric), 3.3V (LCD bias), 2.5V (reference), and 5V (USB PHY), with phase-shifted switching to suppress conducted EMI. Use Value: Achieves <15mVpp output ripple in forced-continuous mode and <10µA quiescent current in Burst Mode - extending runtime without sacrificing measurement fidelity. |
Use Scenario: In-dash head unit with display processor, audio codec, touchscreen controller, and vehicle bus interfaces (CAN, LIN), operating from 9V–16V automotive battery with cold-crank tolerance. IC Role / Device Role / Timing Role: High-input-voltage quad buck regulator delivering 1.1V (SoC core), 1.8V (memory), 3.3V (peripherals), and 5V (USB), with SVIN diode-OR support and VIN overvoltage lockout (19V). Use Value: Survives 24V load-dump transients via integrated 19V OVLO, maintains regulation down to 2.7V input during cold-crank, and provides rail-specific RUN control for safe MCU reset sequencing. |
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 |
|---|---|---|---|
| MPQ4485GQ-AEC1-P | Quad 2A/channel, 2.2MHz, AEC-Q200 qualified, but fixed 0.6V reference only (no adjustable VOUT), no phase-shift control. | Targeted for automotive under-hood use; lacks Burst Mode IQ optimization and flexible topology configuration (e.g., dual 4A). | Select when AEC-Q200 qualification and higher per-channel current are mandatory; avoid when adjustable output or ultra-low IQ is required. |
| TPS54560QDGQRQ1 | Single-channel 5A, 100kHz–2.5MHz syncable, no integrated quad topology - requires four separate ICs for equivalent functionality. | Higher design complexity, larger footprint, and no inter-channel phase coordination - increases input capacitor stress and EMI filtering burden. | Select only if channel independence, thermal isolation, or failure containment outweigh integration benefits and board space constraints. |
Compared with MPQ4485GQ-AEC1-P and TPS54560QDGQRQ1, the LTC3644IY-2#PBF uniquely combines quad integration, 2.25MHz operation, <10µA Burst Mode IQ, and configurable phase/multi-output topologies in a single 5mm × 5mm BGA - making it optimal for space- and battery-limited portable and industrial edge devices where system-level efficiency and layout simplicity are prioritized.
Availability
LTC3644IY-2#PBF is available at Aetrix Electronics and suitable for battery-powered handheld scanners, industrial IoT edge nodes, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3644IY-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 precision instrumentation, communications, and industrial markets since 1965.
The LTC3644 product line delivers highly integrated, ultralow-IQ multi-output DC/DC regulators for portable, battery-sensitive, and space-constrained applications - emphasizing efficiency across full load range, flexible rail configuration, and robust operation in harsh environments.
FAQ
What is the switching frequency of the LTC3644IY-2#PBF?
The LTC3644IY-2#PBF has a factory-set fixed switching frequency of 2.25MHz, with ±50% synchronization range when driven by an external clock on the MODE/SYNC pin. This enables compact filter design and fast transient response, especially critical in portable applications where board space is limited and load steps are frequent. The frequency remains stable across temperature and input voltage variations.
How does the LTC3644IY-2#PBF achieve ultralow quiescent current?
The LTC3644IY-2#PBF achieves <10µA total quiescent current (all four channels enabled) through Burst Mode operation, where the device enters deep sleep with both power switches off until output voltage droops below regulation. This behavior is activated by tying MODE/SYNC to INTVCC. During sleep, only essential bias circuitry remains active, minimizing SVIN current draw while preserving fast wake-up capability - ideal for battery-backed systems.
Can the LTC3644IY-2#PBF be configured for dual 2.5A outputs?
Yes, the LTC3644IY-2#PBF supports dual 2.5A outputs by connecting VIN1/VIN2 and VIN3/VIN4 together, shorting SW1/SW2 and SW3/SW4 respectively, and tying FB2 and FB3 to INTVCC to configure Channels 2 and 3 as slaves to Channels 1 and 4. This leverages internal current-sharing control and maintains single-inductor simplicity per output - verified in the datasheet's Applications Information section.
What is the purpose of the PHASE pin on the LTC3644IY-2#PBF?
The PHASE pin on the LTC3644IY-2#PBF selects the relative switching phase between Channel 1/2 and Channel 3/4: tied to GND for 0° (in-phase) or to INTVCC for 180° (anti-phase). Anti-phase operation reduces input capacitor RMS current and input voltage ripple, easing EMI filter design and thermal distribution. When used with an external clock on MODE/SYNC, PHASE = INTVCC enables duty-cycle-modulated phase shifts beyond 180°.
Does the LTC3644IY-2#PBF support input voltages below 3V?
Yes, the LTC3644IY-2#PBF supports an input voltage range of 2.7V to 17V across all VINx pins and SVIN. Operation down to 2.7V is fully specified, including regulation accuracy, efficiency, and startup behavior. At low input, RDS(ON) increases slightly due to reduced gate drive, but the device maintains full functionality and dropout operation - confirmed in Electrical Characteristics and Typical Performance graphs.
LTC3644IY-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-BGA (5x5)
LTC3644IY-2#PBF FAQ
1.How can I place an order for LTC3644IY-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644IY-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 LTC3644IY-2#PBF reliable?
The price and inventory of LTC3644IY-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 LTC3644IY-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3644IY-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644IY-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644IY-2#PBF?
LTC3644IY-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644IY-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 LTC3644IY-2#PBF?
For technical support, including LTC3644IY-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644IY-2#PBF requirements.
6.How does Aetrix verify that LTC3644IY-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3644IY-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 LTC3644IY-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3644IY-2#PBF?
All LTC3644IY-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644IY-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 LTC3644IY-2#PBF part is unused and in its original packaging.
Return procedure for LTC3644IY-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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