My Inquiry
My Account
Analog Devices Inc. LTC3644IY-2#TRPBF
- Part No.:
- LTC3644IY-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-FBGA
- Datasheet:
-
LTC3644IY-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 36BGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,384
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3644IY-2#TRPBF from Analog Devices is a quad-output synchronous step-down regulator with 2.25MHz fixed switching frequency, 0.6V–VIN adjustable output per channel, and ultralow 10µA quiescent current in Burst Mode with all channels enabled. It delivers up to 1.25A per channel across 2.7V–17V input, integrates 300mΩ P-channel and 80mΩ N-channel MOSFETs, and supports configurable multi-channel parallelization (e.g., dual 3.75A/1.25A) for point-of-load power in battery-powered handheld scanners and portable cameras.
For engineers reviewing the LTC3644IY-2#TRPBF datasheet, LTC3644IY-2#TRPBF pinout, LTC3644IY-2#TRPBF application, or LTC3644IY-2#TRPBF equivalent, key selection considerations include its 2.25MHz ±50% synchronization range, phase-shift programmability via PHASE/MODE pins, ±1% output voltage accuracy, and BGA package thermal performance (θJCbottom = 6.1°C/W).
Technical Context
The LTC3644IY-2#TRPBF employs peak current-mode control with internal slope compensation and a 2.25MHz oscillator, enabling stable regulation at high duty cycles and full dropout operation (100% duty cycle). Its four independent buck channels share a common INTVCC LDO powered by SVIN and support dynamic configuration-FB2/FB3 tied to INTVCC enables triple- or dual-output modes with combined current capability up to 5A.
Operation modes are selected via MODE/SYNC: tie to INTVCC for Burst Mode (IQ < 10µA, 550mA peak clamp), to GND for pulse-skipping, or to 1V–(VINTVCC–1.2V) for forced-continuous mode (lowest ripple, –250mA min peak current). PHASE pin selects 0° or 180° inter-channel phase shift to reduce input ripple; external clock on MODE/SYNC further enables edge-synchronized 90° shifts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.25MHz fixed, ±50% sync range - enables compact 1.2µH–2.2µH inductors and high-frequency noise filtering |
| Input Voltage Range | 2.7V to 17V - supports wide-range industrial and battery inputs including 12V rail and Li+ stacks |
| Output Voltage Range | 0.6V to VIN - allows direct generation of core voltages (e.g., 1.8V, 3.3V) without post-regulation |
| Max Output Current | 1.25A per channel, scalable to 3.75A/1.25A dual-output - eliminates need for external current-sharing circuitry |
| Quiescent Current | <10µA with all channels in Burst Mode - extends battery life in always-on portable systems |
| Feedback Accuracy | ±1% over temperature - ensures tight regulation for sensitive analog and RF subsystems |
| Thermal Resistance | θJCbottom = 6.1°C/W - enables high-power density layout with bottom-side thermal vias to internal ground plane |
Pinout & Package
Package: 36-ball BGA, 5mm × 5mm × 1.72mm, MSL3, RoHS-compliant SAC305 finish. Thermal performance optimized via 12 dedicated GND balls (A3, A4, B3, B4, C3, C4, D3, D4, E3, E4, F3, F4) requiring solid PCB ground plane connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1–FB4 | Channel feedback inputs | Set VOUT via resistor divider; tie FB2/FB3 to INTVCC to configure slave channels for current combining |
| RUN1–RUN4 | Channel enable inputs | Logic-high active; each independently controls startup/shutdown - enables sequenced power-up in multi-rail systems |
| SW1–SW4 | Switch node outputs | Connect to respective inductor; phase alignment (via PHASE pin) reduces input ripple when channels operate in anti-phase |
| PGOOD1–PGOOD4 | Open-drain power-good indicators | Pull high when VOUT within ±7.5%; 32-cycle blanking prevents false trips during load transients |
| MODE/SYNC | Mode select & external clock input | Determines operating mode (Burst/Pulse-skip/Forced-continuous) and accepts external clock for synchronization |
| PHASE | Inter-channel phase control | Tie to GND for 0° shift (channels 1/2 & 3/4 in-phase); tie to INTVCC for 180° shift - critical for EMI reduction in dense layouts |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel integration with shared control logic | Reduces board area vs. discrete regulators while maintaining independent VOUT programming and sequencing |
| Ultralow IQ in Burst Mode (<10µA) | Extends runtime in battery-backed IoT sensors and medical wearables where standby current dominates lifetime |
| Configurable multi-output topologies | Supports quad 1.25A, dual 2.5A, or dual 3.75A/1.25A using single inductors per output - simplifies BOM and layout |
| 100% duty cycle dropout operation | Maintains regulation as VIN approaches VOUT - essential for Li+ battery discharge down to 3.0V while powering 3.3V rails |
| Integrated 300mΩ PMOS / 80mΩ NMOS switches | Delivers up to 93% efficiency at 1.25A without external FETs - eliminates gate-drive complexity and layout sensitivity |
Applications
| Handheld Scanners | Portable Medical Cameras |
|---|---|
Use Scenario: Compact barcode scanner with CMOS image sensor, microcontroller, and laser diode driver requiring isolated 1.8V, 3.3V, and 5V rails from single 7.4V Li+ battery. IC Role / Device Role / Timing Role: LTC3644IY-2#TRPBF provides four synchronized, low-noise DC supplies with independent RUN control for power sequencing and sleep-state isolation. Use Value: 2.25MHz operation minimizes inductor size; Burst Mode cuts standby current to extend scan-session battery life beyond 8 hours. | Use Scenario: Wireless endoscopic camera with low-light image sensor, RF transmitter, and flash LED, powered by coin-cell or rechargeable LiPo. IC Role / Device Role / Timing Role: LTC3644IY-2#TRPBF generates regulated 1.2V core, 2.8V sensor bias, 3.3V logic, and 5V LED drive from 3.0–4.2V input with precise voltage tracking. Use Value: ±1% VOUT accuracy ensures consistent image sensor gain and color fidelity; 10µA IQ preserves battery charge during idle periods between video captures. |
| Industrial Data Loggers | Automotive Infotainment Displays |
Use Scenario: Ruggedized environmental monitor with multiple analog sensors, SD card interface, and LoRaWAN radio operating from 9–16V vehicle supply. IC Role / Device Role / Timing Role: LTC3644IY-2#TRPBF supplies 3.3V MCU, 2.5V ADC reference, 1.8V FPGA I/O, and 5V display backlight with VIN tolerance up to 17V. Use Value: 17V absolute max rating and VIN overvoltage lockout (19V trip) protect against load-dump transients; phase-shifted operation suppresses conducted EMI into sensitive analog front-ends. | Use Scenario: In-dash infotainment unit with touch controller, HDMI receiver, audio codec, and LCD panel requiring tightly regulated, low-ripple supplies. IC Role / Device Role / Timing Role: LTC3644IY-2#TRPBF delivers 1.1V processor core, 1.8V memory, 3.3V I/O, and 5V USB OTG from 12V automotive bus with forced-continuous mode for lowest noise. Use Value: Forced-continuous mode eliminates subharmonic switching artifacts that cause display flicker; integrated MOSFETs eliminate external component count and layout variability. |
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 |
|---|---|---|---|
| LTC3644EY-2#TRPBF | Same electrical specs but rated for 0°C to 85°C junction temperature (vs. –40°C to 125°C for LTC3644IY-2#TRPBF) | Suitable for commercial-grade consumer devices; not qualified for extended-temperature industrial or automotive use | Select LTC3644IY-2#TRPBF for designs requiring guaranteed operation at –40°C or 125°C ambient |
| TPS65270RGET | Triple-output (not quad); 2.2MHz max frequency; no Burst Mode below 25µA; requires external MOSFETs for >1A per channel | Lower integration level; higher BOM cost and layout complexity for equivalent current capability | Choose LTC3644IY-2#TRPBF when quad independent outputs, ultralow IQ, or integrated FETs are mandatory |
Compared with LTC3644EY-2#TRPBF, the LTC3644IY-2#TRPBF adds extended temperature qualification critical for harsh environments; versus TPS65270RGET, it delivers higher integration, lower standby current, and true quad-channel flexibility without external power stages.
Availability
LTC3644IY-2#TRPBF is available at Aetrix Electronics and suitable for battery-powered handheld scanners, portable medical cameras, and industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3644IY-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC3644 product line delivers highly integrated, low-quiescent-current DC/DC solutions for space-constrained, battery-sensitive applications - designed specifically to replace discrete multi-regulator power trees in portable and embedded systems.
FAQ
What is the maximum input voltage rating for the LTC3644IY-2#TRPBF?
The LTC3644IY-2#TRPBF has an absolute maximum input voltage rating of 17V on VIN1–VIN4 and SVIN pins. It also features VIN overvoltage lockout that suspends operation above 19V (rising threshold) with 400mV hysteresis, protecting internal MOSFETs from transient spikes. This makes the LTC3644IY-2#TRPBF suitable for 12V automotive and industrial systems with load-dump immunity requirements.
How does the LTC3644IY-2#TRPBF achieve ultralow quiescent current?
The LTC3644IY-2#TRPBF achieves <10µA quiescent current in Burst Mode by dynamically disabling both power switches when output voltage regulation is met and load current drops below threshold. During sleep, only the bandgap reference and monitoring comparators remain active. The LTC3644IY-2#TRPBF wakes within one switching cycle when VOUT falls outside ±7.5%, ensuring fast transient response without sacrificing efficiency.
Can the LTC3644IY-2#TRPBF be configured for dual 2.5A outputs?
Yes, the LTC3644IY-2#TRPBF can be configured for dual 2.5A outputs by connecting VIN1=VIN2, VIN3=VIN4, SW1=SW2, SW3=SW4, and tying FB2 and FB3 to INTVCC to create two slave channels. This configuration uses only one inductor per output and maintains independent RUN control and PGOOD reporting for each 2.5A rail - verified in the Applications Information section of the LTC3644IY-2#TRPBF datasheet.
What is the purpose of the PHASE pin on the LTC3644IY-2#TRPBF?
The PHASE pin on the LTC3644IY-2#TRPBF selects inter-channel phase relationship: tied to GND for 0° shift (channels 1/2 and 3/4 in-phase), or to INTVCC for 180° anti-phase operation. Anti-phase reduces input capacitor RMS current and conducted EMI. When used with an external clock on MODE/SYNC, PHASE = INTVCC enables edge-synchronized 90° shifts - a feature confirmed in Figure 2 and Table 1 of the LTC3644IY-2#TRPBF datasheet.
Does the LTC3644IY-2#TRPBF support forced-continuous mode, and why would it be used?
Yes, the LTC3644IY-2#TRPBF supports forced-continuous mode when MODE/SYNC is biased between 1V and (VINTVCC – 1.2V). This mode eliminates low-frequency switching artifacts and minimizes output voltage ripple - critical for noise-sensitive applications like high-resolution imaging sensors or RF transceivers. Unlike Burst Mode, forced-continuous operation maintains constant 2.25MHz switching regardless of load, with a minimum peak current of –250mA to sustain regulation at zero load.
LTC3644IY-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)
LTC3644IY-2#TRPBF FAQ
1.How can I place an order for LTC3644IY-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3644IY-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 LTC3644IY-2#TRPBF reliable?
The price and inventory of LTC3644IY-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 LTC3644IY-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3644IY-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3644IY-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3644IY-2#TRPBF?
LTC3644IY-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3644IY-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 LTC3644IY-2#TRPBF?
For technical support, including LTC3644IY-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3644IY-2#TRPBF requirements.
6.How does Aetrix verify that LTC3644IY-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3644IY-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 LTC3644IY-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3644IY-2#TRPBF?
All LTC3644IY-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3644IY-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 LTC3644IY-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3644IY-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3644IY-2#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
