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Analog Devices Inc. LTC3644EY#TRPBF
- Part No.:
- LTC3644EY#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644EY#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,485
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Product details
Overview
LTC3644EY#TRPBF from Analog Devices is a quad-channel, monolithic synchronous step-down regulator with 1MHz fixed switching frequency, supporting up to 1.25A per channel across input voltages from 2.7V to 17V and adjustable output voltages from 0.6V to VIN. It integrates 300mΩ P-Channel and 80mΩ N-Channel MOSFETs, delivers ≥93% efficiency, and operates in ultralow-quiescent-current Burst Mode (<10µA with all channels enabled) for battery-powered handheld scanners and portable cameras.
For engineers reviewing the LTC3644EY#TRPBF datasheet, LTC3644EY#TRPBF pinout, LTC3644EY#TRPBF application, or LTC3644EY#TRPBF equivalent, key selection considerations include its 1MHz/±50% sync-capable oscillator, ±1% output voltage accuracy, phase-shift programmability between channel pairs, no-load IQ <10µA, and configurable multi-output power stages (e.g., dual 2.5A or triple 2.5A/1.25A/1.25A).
Technical Context
The LTC3644EY#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 1MHz oscillator but support phase-shifted operation via the PHASE pin (0° or 180° between channel pairs) to reduce input ripple.
Each channel features dedicated RUN, FB, SW, and PGOOD pins, with configurable slave mode (FBx tied to INTVCC) to combine outputs-enabling dual 2.5A (channels 1+2 or 3+4), triple 2.5A/1.25A/1.25A, or quad 1.25A configurations. MODE/SYNC selects Burst Mode (≤10µA IQ), pulse-skipping, or forced-continuous operation with ≤50mVpp output ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 1.00MHz (±50% sync range); enables compact 3.3–6.8µH inductors and EMI filtering at known fundamental. |
| Output Current per Channel | 1.25A continuous; supports scalable multi-output configurations including dual 2.5A using shared inductors. |
| Input Voltage Range | 2.7V to 17V; accommodates wide-range industrial and battery inputs (e.g., 3.3V–15V Li-ion stacks). |
| Output Voltage Range | 0.6V to VIN; adjustable via external resistor divider (VOUT = 0.6V × [1 + R2/R1]) for precise core/logic rail generation. |
| Quiescent Current | <10µA with all channels enabled in Burst Mode; extends battery life in always-on portable systems. |
| Feedback Voltage Accuracy | ±1% over –40°C to 125°C; ensures tight regulation of critical processor I/O or memory rails. |
| Integrated MOSFETs | 300mΩ P-Channel / 80mΩ N-Channel; eliminates external FETs and gate drivers, reducing BOM count and layout area. |
Pinout & Package
Package: 36-ball BGA, 5mm × 5mm × 1.72mm, RoHS-compliant SAC305 finish, MSL Level 3, rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Per-channel feedback input | Connects to resistor divider tap; sets VOUT = 0.6V × (1 + R2/R1); tying FB2/FB3 to INTVCC configures slave operation. |
| RUN1–RUN4 | Per-channel enable input | Logic-high activates regulator; must not float; allows independent sequencing or fault isolation per rail. |
| SW1–SW4 | Per-channel switch node | Connects to inductor; high dv/dt node requiring tight loop layout and Kelvin grounding for stability. |
| PGOOD1–PGOOD4 | Per-channel open-drain power-good indicator | Pulled high when VOUT within ±7.5%; 32-cycle blanking prevents false triggers during transients. |
| MODE/SYNC | Mode select & external clock input | Tied to INTVCC = Burst Mode; GND = pulse-skipping; 1V–(VINTVCC–1.2V) = forced-continuous; accepts external clock for synchronization. |
| PHASE | Inter-channel phase control | GND = 0° phase shift (ch1/2 & ch3/4 in-phase); INTVCC = 180° shift (reduces input ripple); enables 90° via modulated external clock. |
| SVIN | Signal VIN supply for INTVCC LDO | Powers internal logic; must be connected to highest VINx or via diode-OR network to ensure stable 5V INTVCC. |
| INTVCC | Internal 5V LDO output | Bypass with ≥4.7µF ceramic capacitor; supplies gate drive and control circuitry; used as reference for FB/PGOOD thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | <10µA with all channels active in Burst Mode-critical for multi-rail battery systems requiring weeks of standby time. |
| Configurable multi-output topology | Supports quad 1.25A, dual 2.5A, or triple 2.5A/1.25A/1.25A via pin-strapping; eliminates need for multiple discrete regulators. |
| Phase-shift programmability | 0° or 180° inter-pair phase shift reduces input capacitor RMS current by up to 30%, lowering thermal stress and size. |
| Full dropout operation | 100% duty cycle capability maintains regulation down to VIN ≈ VOUT + 0.3V-essential for brownout resilience in wide-input systems. |
| Integrated power MOSFETs | 300mΩ P-Channel / 80mΩ N-Channel switches deliver ≥93% peak efficiency at 1.25A, eliminating external FET selection and layout complexity. |
Applications
| Handheld Barcode Scanners | Portable Medical Imaging Sensors |
|---|---|
Use Scenario: Compact, battery-operated scanner requiring simultaneous 3.3V (logic), 2.5V (sensor), 1.8V (interface), and 5V (laser driver) rails. IC Role / Device Role / Timing Role: Quad-output point-of-load regulator providing independent, sequenced, and monitored DC rails from single 7.4V Li-ion input. Use Value: Eliminates four discrete buck ICs and associated passives; <10µA shutdown IQ extends battery life to >100 hours per charge. |
Use Scenario: Portable ultrasound probe with low-noise analog front-end, FPGA, display interface, and wireless MCU-all powered from 12V sealed lead-acid. IC Role / Device Role / Timing Role: Multi-rail power manager delivering 1.2V (FPGA core), 2.5V (ADC), 3.3V (MCU), and 5V (transducer bias) with phase-shifted switching to minimize EMI coupling into analog paths. Use Value: 180° phase shift between channel pairs cuts input ripple by 40%, reducing conducted EMI and easing compliance with IEC 60601-1 emissions limits. |
| Industrial IoT Edge Controllers | Ruggedized Handheld Test Equipment |
Use Scenario: DIN-rail mounted controller with isolated RS-485, CAN FD, Ethernet PHY, and ARM Cortex-A53 SoC-powered from 24VDC field supply. IC Role / Device Role / Timing Role: Primary DC-DC stage generating 5V (PHY), 3.3V (SoC I/O), 1.8V (DDR), and 1.1V (SoC core) with independent RUN control for firmware-configurable rail sequencing. Use Value: Per-channel RUN pins enable dynamic power gating of unused subsystems, reducing system idle power by 65% versus fixed-output solutions. |
Use Scenario: Battery-powered multimeter/oscilloscope hybrid requiring ultra-stable 2.5V reference, 3.3V digital, 5V display backlight, and 12V analog front-end bias. IC Role / Device Role / Timing Role: Precision quad regulator with ±1% VOUT accuracy and 7.5% PGOOD window ensuring metrology-grade rail integrity under load transients. Use Value: Tight output tolerance and 32-cycle PGOOD blanking prevent false fault asserts during 100mA–1A load steps-critical for measurement repeatability. |
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-A | Quad 1.2A, 2.5–18V input, 2MHz fixed frequency; no phase-shift control; only 3.3V/5V fixed outputs or external resistor-programmable VOUT. | Lacks configurable multi-output topologies (no dual 2.5A/triple modes); limited to fixed or single-adjustable outputs per channel. | Choose MPQ4436GL-A for cost-sensitive, fixed-rail designs where phase control and flexible output combining are unnecessary. |
| LTC3644EY-2#TRPBF | Same package and pinout; 2.25MHz switching frequency (vs. 1MHz); higher-frequency operation enables smaller inductors (1.2–2.2µH) and reduced output capacitance. | Better suited for space-constrained layouts needing minimal magnetics; slightly higher light-load IQ (~12µA) in Burst Mode. | Choose LTC3644EY-2#TRPBF when board area is critical and 2.25MHz operation aligns with system EMI requirements-no PCB changes required. |
Compared with MPQ4436GL-A, LTC3644EY#TRPBF offers superior configurability (multi-output topologies, phase shift, 1MHz/2.25MHz option) and lower IQ; compared with LTC3644EY-2#TRPBF, it trades higher-frequency efficiency for lower EMI fundamentals and relaxed inductor sizing.
Availability
LTC3644EY#TRPBF is available at Aetrix Electronics and suitable for battery-powered handheld scanners, portable medical imaging sensors, and industrial IoT edge controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3644EY#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 precision instrumentation, industrial automation, communications, and healthcare markets.
The LTC3644 belongs to Analog Devices' Power by Linear™ family of high-efficiency, low-quiescent-current DC/DC regulators designed specifically for space- and power-constrained portable, battery-backed, and always-on embedded systems.
FAQ
What is the maximum input voltage rating for the LTC3644EY#TRPBF?
The LTC3644EY#TRPBF has an absolute maximum input voltage rating of 17V on VIN1–VIN4 and SVIN pins. It incorporates VIN overvoltage lockout that suspends operation above 19V (rising) with 400mV hysteresis, protecting internal MOSFETs from transient spikes. Operation resumes automatically once VIN drops below 18.6V.
Can the LTC3644EY#TRPBF generate dual 2.5A outputs, and how is this configured?
Yes, the LTC3644EY#TRPBF can be configured for dual 2.5A outputs by connecting VIN1=VIN2, SW1=SW2, and FB2 to INTVCC (making channel 2 a slave to channel 1); similarly, VIN3=VIN4, SW3=SW4, and FB3 to INTVCC configures channel 4 as slave to channel 3. This uses only two inductors and achieves 2.5A per output with shared current sensing.
Does the LTC3644EY#TRPBF support external frequency synchronization, and what is the capture range?
Yes, the LTC3644EY#TRPBF supports external clock synchronization via the MODE/SYNC pin. When driven by an external oscillator, it locks to frequencies within ±50% of its nominal switching frequency-i.e., 0.5–1.5MHz for LTC3644EY#TRPBF-enabling EMI reduction through spread-spectrum alignment or system-level clock domain synchronization.
What is the purpose of the PHASE pin on the LTC3644EY#TRPBF, and how does it affect system performance?
The PHASE pin on the LTC3644EY#TRPBF selects 0° (GND) or 180° (INTVCC) phase shift between channel pairs (1/2 vs. 3/4). This reduces input capacitor RMS current and input voltage ripple by up to 30%, lowering thermal stress and enabling smaller, lower-cost bulk capacitors-especially valuable in high-current, multi-rail systems.
How does the LTC3644EY#TRPBF achieve ultralow quiescent current, and what is the typical value?
The LTC3644EY#TRPBF achieves ultralow quiescent current via Burst Mode® operation: when load current drops below threshold, it enters sleep mode with both power switches off, drawing only <10µA from SVIN with all four channels enabled. This is measured at no load, 12V input, and 25°C ambient-critical for extending battery runtime in always-on devices.
LTC3644EY#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)
LTC3644EY#TRPBF FAQ
1.How can I place an order for LTC3644EY#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644EY#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#TRPBF reliable?
The price and inventory of LTC3644EY#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3644EY#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644EY#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644EY#TRPBF?
LTC3644EY#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644EY#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#TRPBF?
For technical support, including LTC3644EY#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644EY#TRPBF requirements.
6.How does Aetrix verify that LTC3644EY#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3644EY#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3644EY#TRPBF?
All LTC3644EY#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644EY#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3644EY#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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