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Analog Devices Inc. LTC3644EY#PBF
- Part No.:
- LTC3644EY#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644EY#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,494
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Product details
Overview
LTC3644EY#PBF 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 output from 0.6V to VIN. It integrates 300mΩ P-Channel and 80mΩ N-Channel MOSFETs, supports Burst Mode operation (IQ < 10µA with all channels enabled), and is packaged in a 5mm × 5mm × 1.72mm BGA. It is used in battery-powered handheld scanners and portable point-of-load supplies.
For engineers reviewing the LTC3644EY#PBF datasheet, LTC3644EY#PBF pinout, LTC3644EY#PBF application, or LTC3644EY#PBF equivalent, key selection criteria include ultralow quiescent current in multi-output configurations, ±1% output voltage accuracy, phase-shift programmability for ripple reduction, and configurable output current up to 5A via channel paralleling - all within a thermally optimized BGA package.
Technical Context
The LTC3644EY#PBF implements a constant-frequency peak-current-mode control architecture across four independent buck regulators, each with dedicated VINx, SWx, FBx, RUNx, and PGOODx pins. Its internal oscillator is fixed at 1MHz (±50% sync range) and features integrated slope compensation for stable high-duty-cycle operation down to 100% dropout.
It supports multiple power-stage configurations - including quad 1.25A, dual 2.5A, or dual 3.75A/1.25A - by externally connecting VIN/SW pins and tying FB2/FB3 or FB2/FB4 to INTVCC. Phase alignment between channel pairs is controlled via the PHASE pin (0° or 180°), and MODE/SYNC selects Burst Mode (ultralow IQ), pulse-skipping, or forced-continuous operation.
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 direct regulation from input rails down to sub-1V logic supplies. |
| Max Output Current per Channel | 1.25A - sufficient for powering FPGAs, microcontrollers, and sensor subsystems individually. |
| Quiescent Current (All Channels Enabled) | <10µA in Burst Mode - extends battery life in always-on portable equipment. |
| Switching Frequency | 1.00MHz (fixed) - enables compact magnetics and fast transient response while avoiding AM radio band interference. |
| Feedback Reference Voltage | 0.6V ±1% - ensures precise output regulation across temperature and load for critical analog/digital rails. |
| Thermal Package | 36-ball BGA, 5mm × 5mm × 1.72mm - provides low θJCbottom (6.1°C/W) for high-power density PCB layouts. |
Pinout & Package
Package: 36-ball BGA, 5mm × 5mm × 1.72mm, MSL Level 3, RoHS-compliant SAC305 finish (part marking: 3644Y).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Per-channel feedback inputs | Connect resistor divider tap to set VOUT = 0.6V × (1 + R2/R1); tie FB2/FB3 to INTVCC to configure slave channels. |
| RUN1–RUN4 | Per-channel enable inputs | Logic-high activates corresponding regulator; must not be left floating - enables independent power sequencing. |
| PGOOD1–PGOOD4 | Open-drain power-good indicators | Pull high when VOUT is within ±7.5% of target; 32-cycle blanking prevents false trips during transients. |
| SW1–SW4 | Per-channel switch-node outputs | Drive external inductors; require low-inductance layout and local ceramic decoupling to minimize EMI. |
| VIN1–VIN4, SVIN | Independent input rails | VINx powers respective channel; SVIN supplies internal LDO (INTVCC) - connect SVIN to highest VINx or use diode-OR network. |
| MODE/SYNC | Mode selection & clock sync | Tie to INTVCC for Burst Mode (IQ < 10µA), GND for pulse-skipping, or external clock for forced-continuous sync. |
| PHASE | Inter-channel phase control | Tie to GND for 0° shift (channels 1/2 & 3/4 in-phase); tie to INTVCC for 180° shift - reduces input ripple in multi-output designs. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel integration with independent control | Eliminates four discrete regulators and associated passives - reduces board area by >40% vs. discrete solutions. |
| Burst Mode operation with <10µA total IQ | Enables multi-rail battery systems (e.g., handheld medical devices) to achieve >1-year shelf life without shutdown circuitry. |
| Configurable output current up to 5A | Supports dual 2.5A or 3.75A/1.25A outputs using shared inductors - avoids redundant magnetics in space-constrained designs. |
| 100% duty cycle dropout operation | Maintains regulation as VIN drops to VOUT - critical for brownout resilience in automotive and industrial backup supplies. |
| ±7.5% PGOOD window with 32-cycle blanking | Ensures reliable system-level power sequencing without false resets during dynamic load steps or thermal drift. |
Applications
| Handheld Barcode Scanners | Portable Medical Imaging Sensors |
|---|---|
Use Scenario: Compact, battery-operated scanner requiring simultaneous 3.3V (MCU), 2.5V (image sensor), 1.8V (interface), and 5V (laser driver) rails. IC Role / Device Role / Timing Role: LTC3644EY#PBF delivers four regulated outputs from a single 7.4V Li-ion pack, with independent RUN control enabling staggered startup and low-power sleep states. Use Value: Achieves <10µA system standby current via Burst Mode on all channels, extending battery runtime beyond 8 hours per charge. |
Use Scenario: Portable ultrasound probe with FPGA, ADC, RF front-end, and display backlight needing tightly regulated, low-noise supplies. IC Role / Device Role / Timing Role: LTC3644EY#PBF serves as primary point-of-load regulator, with phase-shifted switching (PHASE = INTVCC) minimizing input ripple into sensitive analog sections. Use Value: ±1% VOUT accuracy and 0.6V reference ensure consistent ADC full-scale performance across temperature; 1MHz switching avoids interference with 2–15MHz ultrasound bands. |
| Industrial IoT Edge Controllers | Ruggedized Handheld Test Equipment |
Use Scenario: DIN-rail mounted controller with isolated CAN, RS-485, ARM Cortex-M7, and EEPROM, powered from 12–24V DC supply. IC Role / Device Role / Timing Role: LTC3644EY#PBF generates 3.3V (core), 1.2V (DDR), 5V (isolated interface), and 12V (relay driver) from wide-input rail using external boost stage for 12V output. Use Value: 17V absolute max VIN and VIN overvoltage lockout (19V) protect against 24V transients; 125°C junction rating supports uncooled enclosure operation. |
Use Scenario: Field-deployable multimeter with OLED display, precision ADC, and Bluetooth LE, operating from replaceable AA batteries. IC Role / Device Role / Timing Role: LTC3644EY#PBF powers 3.3V (BLE SoC), 2.8V (OLED), 5V (op-amp reference), and 1.8V (ADC core) with per-rail RUN control for dynamic power gating. Use Value: Internal soft-start (1.1ms) prevents inrush-induced brownout during battery insertion; no external soft-start components required. |
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 |
|---|---|---|---|
| MPQ4485GQ-AEC1-Z | Automotive-grade quad 1.2A buck (2.5–18V), AEC-Q200 qualified, 2.2MHz fixed frequency, no phase-shift control. | Requires external phase management; lacks Burst Mode (<25µA IQ) and 100% dropout capability. | Choose for automotive environments where AEC-Q200 compliance is mandatory and phase optimization is handled externally. |
| TPS65218D0RSLR | Power-management IC with quad 1.2A bucks (2.7–5.5V), integrated LDOs, fuel gauge, and PMIC sequencer - narrower VIN range. | Designed for Sitara AM335x/AM437x processors; not suitable for >5.5V input or standalone multi-rail systems. | Choose only for TI processor-based designs requiring tight hardware-controlled power sequencing and battery monitoring. |
Compared with MPQ4485GQ-AEC1-Z and TPS65218D0RSLR, the LTC3644EY#PBF offers broader input range (2.7–17V), lower quiescent current (<10µA), user-programmable phase alignment, and true 100% duty cycle operation - making it uniquely suited for high-efficiency, wide-input portable and industrial multi-rail systems without processor-specific dependencies.
Availability
LTC3644EY#PBF 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 RoHS-compliant packaging.
Supply support for LTC3644EY#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, communications, automotive, and healthcare markets.
The LTC3644EY#PBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered for ultra-low IQ, high-density multi-output power conversion in space- and energy-constrained portable and embedded systems.
FAQ
What is the maximum input voltage rating for the LTC3644EY#PBF?
The LTC3644EY#PBF has an absolute maximum input voltage of 17V on VIN1–VIN4 and SVIN pins. It also includes built-in overvoltage protection that suspends operation if any VINx exceeds 19V, resuming automatically once voltage falls below 18.6V. This protects internal 300mΩ P-Channel and 80mΩ N-Channel MOSFETs during transient events.
How does the LTC3644EY#PBF achieve <10µA quiescent current with all four channels active?
The LTC3644EY#PBF achieves <10µA total IQ in Burst Mode by dynamically disabling both power switches across all channels when output loads fall below threshold, entering deep sleep while maintaining regulation via periodic wake-up cycles. This behavior is enabled by tying MODE/SYNC to INTVCC and is guaranteed over –40°C to 125°C junction temperature.
Can the LTC3644EY#PBF be configured for dual 2.5A outputs instead of quad 1.25A?
Yes - the LTC3644EY#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. This configuration uses only two external inductors and maintains full current capability per output.
What is the purpose of the PHASE pin on the LTC3644EY#PBF?
The PHASE pin on the LTC3644EY#PBF controls relative timing between channel pairs: tied to GND for 0° phase shift (channels 1/2 and 3/4 switching simultaneously), or to INTVCC for 180° anti-phase operation. Anti-phase reduces input capacitor RMS current and input voltage ripple - especially beneficial in high-current multi-output systems.
Does the LTC3644EY#PBF support synchronization to an external clock?
Yes - the MODE/SYNC pin accepts an external clock signal with ±50% frequency tolerance around the nominal 1MHz (LTC3644) or 2.25MHz (LTC3644-2) setting. When driven by an external clock, the LTC3644EY#PBF operates in forced-continuous mode and synchronizes all four channels to the incoming edge, enabling EMI reduction through frequency dithering or system-level clock alignment.
LTC3644EY#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-BGA (5x5)
LTC3644EY#PBF FAQ
1.How can I place an order for LTC3644EY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644EY#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#PBF reliable?
The price and inventory of LTC3644EY#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3644EY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644EY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644EY#PBF?
LTC3644EY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644EY#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#PBF?
For technical support, including LTC3644EY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644EY#PBF requirements.
6.How does Aetrix verify that LTC3644EY#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3644EY#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3644EY#PBF?
All LTC3644EY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644EY#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#PBF part is unused and in its original packaging.
Return procedure for LTC3644EY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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