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Analog Devices Inc. LTC3562EUD#TRPBF
- Part No.:
- LTC3562EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3562EUD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,974
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Product details
Overview
LTC3562EUD#TRPBF from Analog Devices (formerly Linear Technology) is a quad monolithic synchronous step-down DC/DC regulator with I²C interface, integrating two 600mA and two 400mA buck converters in a single 3mm × 3mm QFN-20 package. It supports independent I²C programming of feedback voltage (425–800mV, 25mV steps) for Type-A regulators and output voltage (600mV–3.775V, 25mV steps) for Type-B regulators, operating from 2.7V–5.5V input - ideal for Li-ion-powered portable systems requiring multiple low-noise, low-quiescent-power rails.
For engineers reviewing the LTC3562EUD#TRPBF datasheet, LTC3562EUD#TRPBF pinout, LTC3562EUD#TRPBF application, or LTC3562EUD#TRPBF equivalent, key selection considerations include its 2.25MHz fixed switching frequency enabling compact magnetics, <100μA quiescent current in LDO mode, programmable pulse skip/Burst Mode/LDO/forced Burst Mode operation per regulator, and dual enable schemes (I²C + dedicated RUN pins for R600A/R400A).
Technical Context
The LTC3562EUD#TRPBF implements four independent current-mode synchronous buck regulators: R600A and R400A are externally adjustable via feedback resistors and support I²C-programmable VFB (425–800mV); R600B and R400B feature internal resistor dividers with I²C-programmable VOUT (600mV–3.775V). All operate at a fixed 2.25MHz switching frequency with internal compensation and slew-rate-limited switch nodes to reduce EMI.
Each regulator supports four selectable operating modes - pulse skip (low-noise constant-frequency), Burst Mode (auto-switching between hysteretic and fixed-frequency), forced Burst Mode (hysteretic-only, ≤140mA/100mA max for 600mA/400mA channels), and LDO mode (linear regulation, <100μA IQ with all enabled). RUN600A (active-low) and RUN400A (active-high) allow hardware-enable bypassing I²C control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion (3.4V–4.2V) with margin for dropout and ripple. |
| Output Current Capability | R600A/R600B: up to 600mA; R400A/R400B: up to 400mA - enables multi-rail power delivery for SoCs and peripherals. |
| Switching Frequency | 2.25MHz (typical), 1.91–2.59MHz (min/max) - allows use of ≤4.7μH inductors and small ceramic capacitors. |
| I²C Interface | Standard-mode (400kHz max), DVCC-referenced (1.5–5.5V), slave-only - compatible with most microcontrollers without level-shifting. |
| Quiescent Current | <100μA with all regulators in LDO mode; <0.1μA in full shutdown - extends battery life in standby. |
| Feedback Resolution | Type-A: 25mV steps over 425–800mV; Type-B: 25mV steps over 600–3775mV - enables precise rail tuning for core/memory/I/O voltages. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable consumer environments. |
Pinout & Package
Package: 20-lead 3mm × 3mm plastic QFN with exposed thermal pad (Pin 21 = GND). Thermally enhanced for high-density portable layouts; requires soldering of exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog Ground | Reference for FB pins and internal analog circuitry; must connect to PGND at single point to avoid noise coupling. |
| FB400A (2) | Type-A Feedback Input | Sets R400A output via external resistor divider; servo voltage programmable from 425–800mV in 25mV steps. |
| OUT400B (3) | Type-B Feedback Sense | Connects to top of internal resistor divider for R400B; senses regulated output directly at capacitor for accuracy. |
| SW400B (4) | R400B Switch Node | Drain connection of internal PMOS/NMOS switches; routes to inductor; requires low-inductance layout. |
| PGND (5,11) | Power Ground | Return path for high-current switching loops; must be low-impedance connection to input/output capacitors. |
| SW400A (6) | R400A Switch Node | Drain connection for R400A switches; shares same layout constraints as SW400B. |
| VIN (7,8,9) | Input Supply | Primary power input for all regulators; requires ≥10μF ceramic decoupling close to pins. |
| SW600A (10) | R600A Switch Node | Drain connection for R600A switches; supports up to 600mA load with low RDS(ON). |
| SW600B (12) | R600B Switch Node | Drain connection for R600B switches; optimized for higher-current Type-B regulation. |
| OUT600B (13) | Type-B Feedback Sense | Sense node for R600B internal divider; identical function to OUT400B but for 600mA channel. |
| FB600A (14) | Type-A Feedback Input | Sets R600A output via external divider; independently programmable from FB400A. |
| POR600A (15) | Power-On Reset Output | Open-drain signal asserting after 231ms delay when R600A reaches 92% of target - used for system sequencing. |
| RUN400A (16) | R400A Enable (Active High) | Hardware enable: >1V enables R400A; overrides I²C disable; default VFB = 800mV on activation. |
| RUN600A (17) | R600A Enable (Active Low) | Hardware enable: <0.3V enables R600A; OR'ed with I²C enable; default VFB = 800mV. |
| DVCC (18) | I²C Logic Supply | Sets logic threshold for SDA/SCL; UVLO at ~1V resets registers; bypass with 0.1μF ceramic. |
| SCL (19) | I²C Clock Input | Master-generated clock (≤400kHz); referenced to DVCC; requires external pull-up. |
| SDA (20) | I²C Data I/O | Bi-directional data line; referenced to DVCC; requires external pull-up; slave-only receive capability. |
| Exposed Pad (21) | Thermal & Electrical GND | Mandatory solder connection to PCB ground for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Four Independent I²C-Controlled Regulators | Enables dynamic rail reconfiguration per subsystem (e.g., CPU core, memory, I/O, RF) without hardware changes. |
| Programmable Operating Modes per Channel | Allows real-time trade-off between noise (pulse skip), efficiency (Burst Mode), and ultra-low IQ (LDO mode) based on system state. |
| Slew-Rate Limited Switch Nodes | Reduces radiated EMI and conducted supply noise while maintaining >90% peak efficiency - critical for RF-sensitive designs. |
| Hardware RUN Pins for Two Channels | Permits boot-time power-up of R600A/R400A before I²C initialization - simplifies power sequencing in resource-constrained hosts. |
| Integrated POR for R600A | Provides clean, delay-stabilized reset signal tied to R600A's regulation status - eliminates need for external supervisor IC. |
| Internal Compensation | Removes requirement for external compensation components - reduces BOM count and layout complexity. |
Applications
| Digital Still Cameras | Wireless Modems |
|---|---|
Use Scenario: Powering image sensor, ISP, and memory interfaces with tightly regulated, low-noise supplies during capture and playback. IC Role / Device Role: Quad buck regulator delivering 1.2V (sensor), 1.8V (ISP), 2.5V (memory I/O), and 3.3V (interface) from single Li-ion cell. Use Value: Burst Mode extends battery runtime during idle; slew-limited SW nodes prevent EMI corruption of analog video signals. |
Use Scenario: Supplying baseband processor, RF transceiver, and memory in LTE/Wi-Fi modems with dynamic voltage scaling. IC Role / Device Role: I²C-configurable rails enabling software-defined power states (e.g., sleep, transmit, receive) across multiple domains. Use Value: Forced Burst Mode cuts IQ to <100μA during deep sleep; pulse skip ensures clean 3.3V for RF PA bias during transmission. |
| MP3 Players | Portable Instruments |
Use Scenario: Providing audio codec, DAC, flash memory, and display backlight from compact battery pack. IC Role / Device Role: Four independent regulators powering 1.2V digital core, 1.8V codec, 2.8V display, and 3.3V USB PHY. Use Value: LDO mode delivers ultra-low-noise 1.2V for audio processing; RUN pins ensure fast wake-up from mechanical button press. |
Use Scenario: Powering precision ADCs, microcontrollers, sensors, and communication interfaces in handheld test equipment. IC Role / Device Role: Generating stable, low-drift rails (e.g., 2.5V reference, 3.3V MCU, 1.8V sensor interface, 5V analog front-end). Use Value: Internal compensation and temperature-stable VFB (±0.01V over –40°C to 85°C) ensure measurement accuracy across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65070RSLR | Triple 600mA + single 100mA; no I²C; fixed outputs only; 2.7–5.5V input; 3mm × 3mm QFN-16 | Lacks per-rail programmability and Burst Mode; suited for cost-sensitive, static-rail designs | Select when I²C control and dynamic voltage scaling are unnecessary and BOM cost is prioritized. |
| ISL95210IRZ-T | Dual 3A + dual 1.5A; I²C interface; 2.7–5.5V input; 4mm × 4mm QFN-32; includes telemetry and fault reporting | Higher current capacity and advanced monitoring; larger footprint and higher complexity | Select when >600mA per rail or real-time current/voltage telemetry is required for system health monitoring. |
Compared with TPS65070RSLR and ISL95210IRZ-T, the LTC3562EUD#TRPBF uniquely balances fine-grained I²C programmability (25mV steps), ultra-low quiescent current (<100μA), and compact 3mm × 3mm footprint - making it optimal for space-constrained, battery-operated devices needing flexible, low-noise multi-rail power.
Availability
LTC3562EUD#TRPBF is available at Aetrix Electronics and suitable for digital still cameras, wireless modems, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3562EUD#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3562EUD#TRPBF belongs to Linear's µPower DC/DC regulator product line, designed specifically for battery-powered portable electronics demanding high integration, low IQ, and intelligent power sequencing.
FAQ
What is the maximum output current supported by each regulator in the LTC3562EUD#TRPBF?
The LTC3562EUD#TRPBF integrates two 600mA regulators (R600A and R600B) and two 400mA regulators (R400A and R400B). In pulse skip mode, R600x deliver up to 600mA and R400x up to 400mA. In forced Burst Mode, maximum deliverable current drops to ~140mA for R600x and ~100mA for R400x to maintain regulation. The LTC3562EUD#TRPBF datasheet specifies PMOS current limits of 850mA (R600x) and 600mA (R400x) in pulse skip mode, ensuring robust overload protection.
How does the LTC3562EUD#TRPBF handle power sequencing between its four regulators?
The LTC3562EUD#TRPBF provides partial hardware-based sequencing via the POR600A pin - an open-drain output that asserts after a 231ms delay once R600A reaches 92% of its target voltage. This signal can drive enable inputs of downstream regulators or processors. For full four-rail sequencing, I²C commands must be issued in desired order, as regulators operate independently with no built-in inter-channel timing coordination. The LTC3562EUD#TRPBF does not include automatic staggered soft-start across channels.
Can the LTC3562EUD#TRPBF operate without an I²C host controller?
Yes - the LTC3562EUD#TRPBF supports hardware-only operation for R600A and R400A using their dedicated RUN pins (RUN600A active-low, RUN400A active-high). When enabled this way, both regulators start in pulse skip mode with default VFB = 800mV. R600B and R400B lack RUN pins and remain disabled until configured via I²C; they cannot operate without I²C initialization. The LTC3562EUD#TRPBF thus enables hybrid control: critical rails via hardware, configurable rails via firmware.
What is the purpose of the slew-rate limiting feature on the LTC3562EUD#TRPBF switch nodes?
The LTC3562EUD#TRPBF incorporates patented switch-node slew-rate limiting to reduce high-frequency energy in the 30–300MHz EMI band, minimizing radiated emissions and conducted noise on input/output rails. This circuitry transitions SWx pins over several nanoseconds instead of sub-nanosecond edges - lowering dv/dt without compromising efficiency. It is especially valuable in RF-dense applications like wireless modems and digital cameras where unfiltered switching noise could desensitize receivers. The LTC3562EUD#TRPBF achieves this while maintaining >90% peak efficiency.
Does the LTC3562EUD#TRPBF require external compensation components?
No - the LTC3562EUD#TRPBF uses fully internal compensation for all four regulators. Its current-mode architecture and optimized error amplifier design eliminate the need for external RC networks on FB pins or elsewhere. This reduces bill-of-materials cost, PCB area, and design risk associated with stability tuning. Layout best practices (e.g., short FB traces, proper PGND/AGND separation, adequate input/output capacitance) remain essential, but no compensation components are required for stable operation across the full load and temperature range specified for the LTC3562EUD#TRPBF.
LTC3562EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.425V (0.6V)
- Voltage - Output (Max):
- 0.8V (3.78V)
- Current - Output:
- 400mA, 600mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
LTC3562EUD#TRPBF FAQ
1.How can I place an order for LTC3562EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3562EUD#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 LTC3562EUD#TRPBF reliable?
The price and inventory of LTC3562EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3562EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3562EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3562EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3562EUD#TRPBF?
LTC3562EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3562EUD#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 LTC3562EUD#TRPBF?
For technical support, including LTC3562EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3562EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3562EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3562EUD#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 LTC3562EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3562EUD#TRPBF?
All LTC3562EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3562EUD#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 LTC3562EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3562EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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