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Analog Devices Inc. LTC3644IY#TRPBF
- Part No.:
- LTC3644IY#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644IY#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,696
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Product details
Overview
LTC3644IY#TRPBF from Analog Devices is a quad-channel, 1.25A per channel synchronous step-down regulator with fixed 1MHz switching frequency, operating from 2.7V to 17V input and delivering adjustable 0.6V–VIN outputs. It integrates 300mΩ P-Channel and 80mΩ N-Channel MOSFETs, supports Burst Mode® operation (IQ < 10µA with all channels enabled), and enables configurable output combinations (e.g., dual 2.5A or triple 2.5A/1.25A/1.25A) for multi-rail power delivery in portable imaging systems.
For engineers reviewing the LTC3644IY#TRPBF datasheet, LTC3644IY#TRPBF pinout, LTC3644IY#TRPBF application, or LTC3644IY#TRPBF equivalent, key selection criteria include ultralow quiescent current in battery-powered operation, ±1% output voltage accuracy across temperature, phase-shift programmability between channel pairs, and BGA package thermal performance (θJCbottom = 6.1°C/W) for high-density point-of-load designs.
Technical Context
The LTC3644IY#TRPBF employs peak-current-mode control with internal slope compensation, enabling stable regulation at high duty cycles up to 100% dropout. Its four independent buck channels share a common oscillator but support programmable phase alignment (0° or 180°) via the PHASE pin to reduce input ripple.
Each channel features dedicated RUNx enable inputs, open-drain PGOODx indicators with ±7.5% window and 32-cycle blanking, and FBx pins referenced to a precise 0.6V bandgap (±1% over –40°C to 125°C). MODE/SYNC pin selects among Burst Mode® (≤10µA IQ), pulse-skipping, or forced-continuous operation - directly affecting light-load efficiency versus output ripple trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and battery-supplied systems without external pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables generation of sub-1V core rails (e.g., 0.8V FPGA I/O) and flexible multi-voltage sequencing. |
| Max Output Current per Channel | 1.25A - sufficient for powering multiple low-power processors, sensors, or interface ICs from a single IC. |
| Quiescent Current (All Channels Enabled) | <10µA in Burst Mode - extends battery life in always-on portable devices such as handheld scanners. |
| Switching Frequency | 1.00MHz (fixed) - allows compact 3.3–6.8µH inductors and reduces EMI filtering requirements vs lower-frequency alternatives. |
| Output Voltage Accuracy | ±1% over –40°C to 125°C - ensures reliable regulation under thermal stress in automotive or industrial enclosures. |
| Package Thermal Resistance (Bottom) | θJCbottom = 6.1°C/W - enables high-power density layout with direct PCB copper thermal vias to inner ground planes. |
Pinout & Package
5mm × 5mm × 1.72mm 36-ball BGA package (MSL 3, e1 finish) with 0.8mm ball pitch and exposed thermal pad. Requires controlled-depth reflow and recommended BGA assembly per Analog Devices' guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Feedback Input (per channel) | Connects to resistor divider tap; sets VOUT = 0.6V × (1 + R2/R1); tying FB2/FB3 to INTVCC configures slave channels for combined outputs. |
| RUN1–RUN4 | Channel Enable Input | Logic-high active; must not float; enables/disables individual regulators for dynamic rail control or power sequencing. |
| PGOOD1–PGOOD4 | Open-Drain Power Good Output | Pulled high when VOUT within ±7.5%; 32-cycle blanking prevents false trips during transients; requires external pull-up. |
| SW1–SW4 | Switch Node (per channel) | Connects to inductor; carries high di/dt; requires tight layout with local ceramic decoupling to minimize EMI and ringing. |
| VIN1–VIN4, SVIN | Input Supply Pins | VINx powers respective channel's power stage; SVIN supplies internal LDO (INTVCC) - connect SVIN to highest VINx or use diode-OR network. |
| MODE/SYNC | Mode Control & Clock Sync | Tied to INTVCC → Burst Mode; GND → pulse-skipping; 1V–(VINTVCC−1.2V) → forced-continuous; driven by external clock → synchronization + forced mode. |
| PHASE | Inter-Channel Phase Select | GND → 0° phase shift (channels 1/2 and 3/4 in-phase); INTVCC → 180° anti-phase; reduces input ripple and improves thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel integration with shared control logic | Reduces board area and component count vs discrete buck solutions while maintaining independent rail control and fault isolation. |
| Ultralow IQ in Burst Mode (<10µA) | Enables >1-year battery life in always-on IoT edge nodes or medical wearables with intermittent sensor activation. |
| Configurable output current sharing (up to 5A total) | Supports dual 2.5A or 3.75A/1.25A configurations using single inductors per output - simplifies magnetics and lowers BOM cost. |
| Integrated 300mΩ PMOS / 80mΩ NMOS switches | Eliminates external FETs and gate drivers; achieves up to 93% efficiency at 1.25A/5V out from 12V input (Burst Mode). |
| 1.1ms internal soft-start per channel | Prevents inrush current and output overshoot during power-up; operates in pulse-skipping mode regardless of MODE/SYNC setting. |
| ±50% frequency synchronization range | Allows EMI reduction via spread-spectrum clocking or alignment with system master clock to avoid beat frequencies. |
Applications
| Portable Handheld Scanners | Multi-Rail FPGA Power Delivery |
|---|---|
Use Scenario: Battery-powered barcode scanner requiring separate 3.3V, 2.5V, 1.8V, and 1.2V rails for image sensor, processor, memory, and interface ICs. IC Role / Device Role / Timing Role: LTC3644IY#TRPBF provides four independently regulated, sequenced outputs with PGOOD monitoring for safe startup and fault reporting. Use Value: Single-chip solution replaces four discrete buck converters, reducing PCB area by >40% and eliminating four inductors and associated layout complexity. |
Use Scenario: Compact embedded vision system with Xilinx Artix-7 FPGA needing tightly regulated core (1.0V), auxiliary (1.8V), I/O (3.3V), and DDR (1.5V) supplies. IC Role / Device Role / Timing Role: LTC3644IY#TRPBF delivers four precision rails with ±1% accuracy and fast transient response to handle FPGA dynamic load steps. Use Value: Configurable phase alignment minimizes input capacitor RMS current; integrated MOSFETs eliminate external driver timing skew and gate charge losses. |
| Industrial Point-of-Load Supplies | Low-Power Edge AI Cameras |
Use Scenario: DIN-rail mounted controller requiring isolated 5V, 3.3V, 2.4V, and 1.2V rails for microcontroller, CAN transceiver, analog front-end, and sensor biasing. IC Role / Device Role / Timing Role: LTC3644IY#TRPBF serves as primary non-isolated POL regulator downstream of an isolated DC/DC converter, with robust OVP/UVP protection. Use Value: 17V max input withstands 24V industrial bus transients; VIN overvoltage lockout (19V trip) protects internal MOSFETs without external clamping. |
Use Scenario: Always-on smart camera with motion-triggered inference, requiring ultra-low standby power and rapid wake-up from deep sleep. IC Role / Device Role / Timing Role: LTC3644IY#TRPBF powers SoC, image sensor, and Wi-Fi module with per-rail RUNx control and sub-10µA quiescent draw in Burst Mode. Use Value: No-load IQ <10µA extends lithium-thionyl chloride battery life beyond 5 years; PGOOD signals enable precise firmware-controlled power 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 |
|---|---|---|---|
| TPS65270PWP | Triple 2A + dual LDO; fixed 1.2MHz; no phase shift; higher IQ (25µA) | Designed for DSP/ARM power trees; lacks quad-buck flexibility and ultralow IQ | Choose for simpler triple-rail systems where LDOs replace fourth buck; avoid when <10µA IQ or phase control is required. |
| MPQ4482GL-AEC1 | Quad 1A; AEC-Q100 qualified; 2.2MHz; no Burst Mode; IQ = 28µA | Automotive-grade only; no ultralow-IQ mode; higher minimum load requirement | Choose only for automotive applications requiring AEC-Q100; not suitable for battery-critical portable designs. |
Compared with TPS65270PWP and MPQ4482GL-AEC1, the LTC3644IY#TRPBF uniquely combines quad 1.25A buck capability, <10µA quiescent current, programmable phase alignment, and 1MHz fixed frequency - making it optimal for space-constrained, battery-sensitive, multi-rail embedded systems where efficiency, thermal management, and design simplicity are critical.
Availability
LTC3644IY#TRPBF is available at Aetrix Electronics and suitable for portable handheld scanners, FPGA-based vision systems, and industrial point-of-load supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC3644IY#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, automotive, communications, and healthcare markets.
The LTC3644IY#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 management in space- and battery-constrained embedded systems.
FAQ
What is the guaranteed operating temperature range for the LTC3644IY#TRPBF?
The LTC3644IY#TRPBF is specified and guaranteed over the industrial temperature range of –40°C to 125°C junction temperature. This rating is validated through design, characterization, and statistical process control - unlike the E-grade version, which is only guaranteed from 0°C to 85°C. The I-grade marking ensures reliability in demanding environments such as factory automation controllers or outdoor edge AI devices where ambient temperatures exceed 85°C.
Can the LTC3644IY#TRPBF be configured for a single 5A output?
No - the LTC3644IY#TRPBF does not support a true 5A single output. It can be configured for dual outputs: up to 3.75A (three channels paralleled) + 1.25A (fourth channel), or dual 2.5A outputs. For 5A, external current-sharing circuitry or a different regulator (e.g., LTC3892-based two-phase design) is required. The datasheet explicitly states "5A IOUT Configurable with One Inductor" refers to combined channel current, not a single rail.
How does the PHASE pin affect thermal performance in the LTC3644IY#TRPBF?
Tying the PHASE pin to INTVCC enables 180° anti-phase operation between channel pairs (1/2 vs 3/4), which staggers switch-node transitions and reduces RMS input capacitor current by up to 30%. This lowers power loss in input decoupling capacitors and associated PCB traces, resulting in measurably cooler operation - especially critical in sealed enclosures or high-density layouts where thermal dissipation is constrained.
Is the LTC3644IY#TRPBF pin-compatible with the LTC3644-2 variant?
No - the LTC3644IY#TRPBF (1MHz version) and LTC3644IY-2#TRPBF (2.25MHz version) share identical pinout, package, and functional interface, but differ in internal oscillator frequency and related timing parameters (e.g., minimum on-time, recommended inductor values). They are functionally interchangeable only if the system design accommodates the frequency difference and associated loop stability adjustments.
What is the role of the SVIN pin in the LTC3644IY#TRPBF, and how should it be connected?
The SVIN pin supplies the internal INTVCC LDO (5V output) that powers all control logic, gate drivers, and error amplifiers. It must be connected to the highest of VIN1–VIN4, or to a diode-OR network across all VINx pins, to ensure stable operation even if one input rail drops. Connecting SVIN to a lower voltage than the active VINx causes degraded RDS(ON) and reduced efficiency - confirmed in the Electrical Characteristics table under "Low Supply Operation."
LTC3644IY#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-BGA (5x5)
LTC3644IY#TRPBF FAQ
1.How can I place an order for LTC3644IY#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644IY#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 LTC3644IY#TRPBF reliable?
The price and inventory of LTC3644IY#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3644IY#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3644IY#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644IY#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644IY#TRPBF?
LTC3644IY#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644IY#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 LTC3644IY#TRPBF?
For technical support, including LTC3644IY#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644IY#TRPBF requirements.
6.How does Aetrix verify that LTC3644IY#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3644IY#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 LTC3644IY#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3644IY#TRPBF?
All LTC3644IY#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644IY#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 LTC3644IY#TRPBF part is unused and in its original packaging.
Return procedure for LTC3644IY#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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