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Analog Devices Inc. LTC3644EY-2#TRPBF
- Part No.:
- LTC3644EY-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644EY-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3644EY-2#TRPBF from Analog Devices is a quad-output synchronous step-down regulator IC with 2.25MHz fixed switching frequency, supporting adjustable output voltages from 0.6V to VIN across four channels, each delivering up to 1.25A. It integrates 300mΩ P-channel and 80mΩ N-channel MOSFETs, achieves <10µA quiescent current in Burst Mode with all channels enabled, and operates from 2.7V to 17V input-ideal for compact, battery-powered point-of-load systems requiring ultralow IQ and multi-rail power delivery.
For engineers reviewing the LTC3644EY-2#TRPBF datasheet, LTC3644EY-2#TRPBF pinout, LTC3644EY-2#TRPBF application, or LTC3644EY-2#TRPBF equivalent, key selection criteria include its 2.25MHz ±50% synchronization range, phase-shift programmability between channel pairs, ±1% VOUT accuracy, configurable multi-output current modes (1.25A/2.5A/3.75A), and BGA thermal performance (θJCbottom = 6.1°C/W).
Technical Context
The LTC3644EY-2#TRPBF employs peak-current-mode control with internal slope compensation, enabling stable operation up to 100% duty cycle in dropout. Its four independent buck regulators share a common oscillator but support phase shifting (0° or 180°) via the PHASE pin to reduce input ripple when channels are combined.
Each channel features dedicated RUN, FB, SW, and PGOOD pins, with configurable slave mode (via FBx-to-INTVCC connection) for output combining. The MODE/SYNC pin selects among Burst Mode (IQ < 10µA), pulse-skipping, or forced-continuous operation-directly trading light-load efficiency against output voltage ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz fixed, ±50% sync range-enables smaller magnetics and faster transient response vs 1MHz variant. |
| Input Voltage Range | 2.7V to 17V-supports wide industrial and battery-input applications including 12V rail and Li+ stacks. |
| Output Voltage Range | 0.6V to VIN-allows precise low-voltage rails (e.g., 1.8V, 2.5V, 3.3V) with ±1% feedback reference accuracy. |
| Max Output Current per Channel | 1.25A-scalable to 2.5A (dual), 3.75A (triple), or 5A (quad-combined) via pin-strapping and shared inductors. |
| Quiescent Current | <10µA with all channels enabled in Burst Mode-critical for always-on battery systems with multi-week standby. |
| Thermal Resistance (θJCbottom) | 6.1°C/W-enables high-power density in 5mm × 5mm BGA package with direct PCB thermal path. |
| Feedback Reference Voltage | 0.6V ±1%-sets output accuracy baseline; enables resistor-divider programming without external references. |
Pinout & Package
Package: 36-ball BGA, 5mm × 5mm × 1.72mm, RoHS-compliant SAC305 finish, MSL Level 3. Thermal design requires soldering all GND balls (12 total) to solid PCB ground plane for rated θJCbottom = 6.1°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Per-channel feedback inputs | Connect resistor divider tap to set VOUT; tie FB2/FB3 to INTVCC to configure slave channels for current combining. |
| RUN1–RUN4 | Per-channel enable inputs | Logic-high active; must not float-controls individual regulator startup/shutdown for power sequencing. |
| SW1–SW4 | Per-channel switch node outputs | Drive external inductors; SW1/SW2 and SW3/SW4 may be paralleled for dual 2.5A/3.75A configurations. |
| PGOOD1–PGOOD4 | Per-channel open-drain status indicators | Pull high when VOUT is within ±7.5%; 32-cycle blanking prevents false trips during transients. |
| MODE/SYNC | Mode select & external clock input | Tie to INTVCC for Burst Mode (ultralow IQ), GND for pulse-skipping, or apply external clock for forced-continuous + sync. |
| PHASE | Inter-channel phase control | Tie to GND for 0° shift (in-phase), INTVCC for 180° shift (anti-phase)-reduces input ripple in multi-channel configs. |
| SVIN | Signal VIN supply for INTVCC LDO | Must be ≥2.5V to enable regulation; powers internal logic-connect to highest VINx or via diode-OR network. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel integration with independent control | Eliminates four discrete regulators and associated layout complexity while maintaining per-rail flexibility in sequencing, voltage, and current. |
| Ultralow 10µA quiescent current (all channels active) | Extends battery life in always-on IoT sensors and portable medical devices without sacrificing multi-rail capability. |
| Configurable output current scaling (1.25A → 5A) | Enables single-part inventory for multiple power architectures-e.g., quad 1.25A for FPGA I/O, dual 2.5A for core logic, or 3.75A+1.25A for mixed-signal SoCs. |
| 180° phase-shift capability between channel pairs | Reduces RMS input capacitor current by up to 30% in dual-output configurations, lowering EMI and required CIN size. |
| Full dropout operation (100% duty cycle) | Maintains regulation as input drops to VOUT, critical for brownout resilience in automotive and industrial 12V systems. |
Applications
| Battery-Powered Portable Instruments | Multi-Rail FPGA/ASIC Point-of-Load |
|---|---|
Use Scenario: Handheld barcode scanners and thermal imaging cameras requiring long battery life and simultaneous 1.2V, 1.8V, 3.3V, and 5V rails. IC Role / Device Role / Timing Role: Quad-output DC/DC converter providing independent, sequenced, low-noise power domains from single Li+ or 2S battery input. Use Value: <10µA quiescent current extends standby time to >6 months; 2.25MHz switching allows ultra-compact 2.2µH inductors and 47µF ceramic output caps. |
Use Scenario: High-speed FPGA development boards needing tightly regulated, low-ripple supplies for core, I/O, transceiver, and auxiliary logic. IC Role / Device Role / Timing Role: Integrated quad buck regulator delivering four precision rails with synchronized switching and programmable phase alignment. Use Value: Phase-shifted operation cuts input ripple amplitude by 50%, reducing EMI filter size; ±1% VFB ensures FPGA voltage margin compliance across temperature. |
| Industrial Sensor Node Power Management | Automotive Body Control Module (BCM) Subsystem |
Use Scenario: Wireless sensor nodes deployed in remote locations with limited battery replacement access and strict EMC requirements. IC Role / Device Role / Timing Role: Central power manager generating isolated analog, digital, RF, and MCU supply rails from 9–16V vehicle or solar input. Use Value: 17V max input withstands load-dump transients; Burst Mode maintains µA-level sleep current while supporting fast wake-up via RUN pin control. |
Use Scenario: BCM subsystems powering door modules, lighting drivers, and LIN transceivers with varying current demands and thermal constraints. IC Role / Device Role / Timing Role: Compact, thermally efficient quad regulator supplying 5V (microcontroller), 3.3V (CAN transceiver), 1.8V (sensor interface), and 12V (LED driver bias). Use Value: 5mm × 5mm BGA with bottom-side thermal pad fits tight PCB real estate; θJCbottom = 6.1°C/W sustains 1.25A/channel at 85°C ambient without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4436GL-AEC1-Z | Quad 1.2A, 2.2MHz, AEC-Q100 Grade 1, 3.8–36V input, no phase-shift control | Automotive-qualified only; lacks programmable phase, Burst Mode IQ = 25µA (vs 10µA) | Select for automotive-grade reliability where extended temp and qualification outweigh phase control needs. |
| LTC3375EY#PBF | Octal 300mA/600mA/1.2A configurable buck, 1–3MHz, 2.25–20V input, 12µA IQ (all on) | Higher channel count but lower per-channel current; no 2.25MHz option; different pinout and configuration logic | Select when system requires >4 rails or finer current granularity, accepting trade-offs in max current and frequency precision. |
Compared with MPQ4436GL-AEC1-Z and LTC3375EY#PBF, the LTC3644EY-2#TRPBF uniquely delivers 2.25MHz fixed frequency with ±50% sync, 180° inter-pair phase shift, and sub-10µA quiescent current-making it optimal for space-constrained, battery-sensitive, multi-rail designs demanding both high efficiency and precise EMI control.
Availability
LTC3644EY-2#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, multi-rail FPGA/ASIC point-of-load systems, and industrial sensor node power management requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC3644EY-2#TRPBF 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, communications, automotive, and healthcare markets since 1965.
The LTC3644EY-2#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered specifically for high-efficiency, low-quiescent-current, multi-output power delivery in space- and energy-constrained embedded systems.
FAQ
What is the switching frequency of the LTC3644EY-2#TRPBF?
The LTC3644EY-2#TRPBF has a fixed internal switching frequency of 2.25MHz, with a ±50% synchronization range when an external clock is applied to the MODE/SYNC pin. This higher frequency versus the 1MHz LTC3644 variant enables smaller external components and improved transient response in compact layouts.
Can the LTC3644EY-2#TRPBF operate with input voltage below 2.7V?
No-the LTC3644EY-2#TRPBF specifies a minimum operating input voltage of 2.7V across all VINx and SVIN pins. Operation below this threshold violates absolute maximum ratings and will disable regulation; SVIN must also remain ≥2.5V to sustain INTVCC and internal logic functionality.
How does the PHASE pin affect channel operation in the LTC3644EY-2#TRPBF?
The PHASE pin configures relative timing between channel pairs: tied to GND sets 0° phase shift (channels 1/2 and 3/4 switching simultaneously), while tied to INTVCC sets 180° anti-phase operation-reducing input ripple and improving thermal distribution in combined-output configurations.
What is the maximum output current achievable using channel combining on the LTC3644EY-2#TRPBF?
The LTC3644EY-2#TRPBF supports up to 5A total output by combining channels: dual 2.5A (channels 1+2 and 3+4), triple 3.75A+1.25A (channels 1+2+4 and channel 3), or quad 1.25A. Combining requires shared VINx, SWx, and FBx-to-INTVCC connections per group as specified in the Applications Information section.
Does the LTC3644EY-2#TRPBF support forced-continuous mode, and how is it enabled?
Yes-the LTC3644EY-2#TRPBF supports forced-continuous mode by applying a voltage between 1V and (VINTVCC – 1.2V) to the MODE/SYNC pin. This ensures cycle-by-cycle switching regardless of load, minimizing output voltage ripple at the expense of slightly higher light-load quiescent current versus Burst Mode.
LTC3644EY-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-FBGA
- Packaging:
- Tape & Reel (TR)
- 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, 1.25A, 1.25A, 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)
LTC3644EY-2#TRPBF FAQ
1.How can I place an order for LTC3644EY-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644EY-2#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3644EY-2#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3644EY-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644EY-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644EY-2#TRPBF?
LTC3644EY-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644EY-2#TRPBF 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#TRPBF?
For technical support, including LTC3644EY-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644EY-2#TRPBF requirements.
6.How does Aetrix verify that LTC3644EY-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3644EY-2#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3644EY-2#TRPBF?
All LTC3644EY-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644EY-2#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3644EY-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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