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Analog Devices Inc. LTC3545EUD-1#PBF
- Part No.:
- LTC3545EUD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3545EUD-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA TRPL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,661
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Product details
Overview
LTC3545EUD-1#PBF from Analog Devices (formerly Linear Technology) is a triple-output, monolithic synchronous step-down DC/DC regulator IC designed for single-cell Li-ion battery-powered systems. It delivers three independent 800mA outputs with fixed 2.25MHz switching frequency, Burst Mode™ operation only, and dedicated PGOOD pins for all three channels - enabling precise power-on sequencing in compact portable electronics.
For engineers reviewing the LTC3545EUD-1#PBF datasheet, LTC3545EUD-1#PBF pinout, LTC3545EUD-1#PBF application, or LTC3545EUD-1#PBF equivalent, key selection criteria include its fixed Burst Mode operation (no MODE/SYNC pin), 0.6V feedback reference, 2.25V–5.5V input range, 16-pin 3mm × 3mm QFN package with exposed thermal pad, and guaranteed –40°C to 125°C operation.
Technical Context
The LTC3545EUD-1#PBF implements a constant-frequency, current-mode control architecture with internal P-channel and N-channel synchronous MOSFETs per channel. Each regulator operates independently with dedicated RUN and PGOOD pins, eliminating external sequencing logic.
Unlike the LTC3545, the -1 variant replaces the SYNC/MODE pin with PGOOD3 and disables pulse-skipping mode - ensuring consistent low-quiescent-current operation (58μA typical) across all load conditions. Its 0.6V reference supports output voltages as low as 0.6V via external resistor dividers, and integrated soft-start (≈1.1ms) limits inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - compatible with single Li-ion (2.7–4.2V) and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Output Current per Channel | 800mA - sufficient to power core logic, memory, and I/O rails in smartphones and digital cameras. |
| Switching Frequency | 2.25MHz (fixed) - enables use of small 1.5μH inductors and ceramic capacitors, minimizing solution footprint. |
| Quiescent Current | 58μA (Burst Mode, all regulators sleeping) - extends battery life in standby and low-power states. |
| Feedback Reference Voltage | 0.6V ±12mV (–40°C to 125°C) - allows precise low-voltage regulation (e.g., 1.2V, 1.5V, 1.8V) with standard resistor tolerances. |
| Power Good Threshold | ±7.5% deviation from VFB - ensures reliable rail monitoring and sequencing without external comparators. |
| RDS(ON) (P-FET / N-FET) | 0.35Ω / 0.35Ω at 100mA - minimizes conduction loss at medium loads; RDS(ON) increases predictably with temperature and input voltage. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2, SW3 (Pins 1, 5, 8) | Switch node connections for each buck stage | Drive external inductors; must be routed with short, low-inductance paths to minimize EMI and switching losses. |
| PGOOD1, PGOOD2, PGOOD3 (Pins 2, 4, 9) | Open-drain power-good indicators | Enable cascaded enable sequencing (e.g., PGOOD1 → RUN2 → PGOOD2 → RUN3); require external pull-up to appropriate rail. |
| RUN1, RUN2, RUN3 (Pins 14, 3, 10) | Independent regulator enable inputs | Logic-high (>1V) enables corresponding channel; logic-low (<0.3V) forces shutdown with <0.1μA quiescent draw. |
| VFB1, VFB2, VFB3 (Pins 13, 12, 11) | Feedback inputs for output voltage regulation | Connect to resistor divider from output; 0.6V reference sets VOUT = 0.6V × (1 + R1/R2); supports remote sensing. |
| VIN (Pin 15) | Supply for internal bias circuitry and Regulator 1 | Must be decoupled with ≥10μF ceramic capacitor; powers control logic and gate drivers for Channel 1. |
| PVIN (Pin 7) | Power path supply for Regulators 2 and 3 | Separate high-current input for Channels 2/3; requires local ≥4.7μF ceramic decoupling to PGND. |
| GNDA (Pin 16) | Analog ground for control circuitry | Reference for error amplifiers and oscillators; should be connected to clean analog ground plane, separate from PGND if possible. |
| PGND (Pin 6) | Power ground return for Regulators 2 and 3 | High-current return path; must be tied to VIN/PVIN ground planes with low-inductance connection near IC. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent 800mA buck regulators | Enables single-chip power management for multi-rail SoC systems (e.g., core, memory, I/O) without external controllers or discrete FETs. |
| Burst Mode™ operation only (LTC3545-1 variant) | Guarantees ultra-low 58μA quiescent current across full load range - critical for battery runtime in always-on sensors and modems. |
| Dedicated PGOOD pins for all three channels | Eliminates need for external power supervisors; simplifies board-level sequencing and fault detection in space-constrained designs. |
| 0.6V reference with ±0.012V max drift over temperature | Supports accurate low-voltage outputs (e.g., 1.2V @ ±1%) using standard 1% resistors - reduces BOM cost vs. precision references. |
| Internal synchronous MOSFETs (0.35Ω RDS(ON)) | Removes need for external Schottky diodes and gate drivers - cuts solution size by >30% and improves efficiency by 5–8% at 200mA loads. |
Applications
| Smartphone Core Power | DSL Modem PHY Supply |
|---|---|
Use Scenario: Powering application processor core, DDR memory, and baseband I/O rails from a single Li-ion cell. IC Role / Device Role / Timing Role: Triple-output PMIC providing sequenced, low-noise 1.2V (core), 1.5V (memory), and 1.8V (I/O) supplies with independent enable control. Use Value: Reduces component count by replacing three discrete buck converters; Burst Mode extends standby time beyond 72 hours on 1500mAh battery. |
Use Scenario: Generating isolated 3.3V, 2.5V, and 1.8V rails for DSL line driver, analog front-end, and digital logic in residential gateways. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator delivering stable, low-ripple outputs under dynamic ADSL2+ line load transients. Use Value: Maintains >85% efficiency at 50mA–600mA loads; PGOOD sequencing prevents latch-up during cold start and firmware update cycles. |
| Digital Still Camera Sensor Bias | Portable Medical Instrument |
Use Scenario: Supplying image sensor analog bias (2.8V), digital core (1.2V), and interface (1.8V) rails in compact camera modules. IC Role / Device Role / Timing Role: Low-noise, fast-transient-response regulator ensuring clean power for CMOS sensor readout and ADC conversion. Use Value: 2.25MHz switching avoids interference with sensor pixel clock harmonics; soft-start prevents mechanical shutter jitter during power-up. |
Use Scenario: Powering microcontroller, OLED display, and biometric sensor subsystems in handheld glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Ultra-low-IQ triple buck converter enabling >1-year battery life on two AAA cells while supporting active measurement bursts. Use Value: 58μA shutdown current and Burst Mode operation reduce average system power to <10μW in sleep - meeting ISO 13485 low-power validation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | 3-channel buck (600mA/600mA/600mA) + dual LDO; 2.25MHz; supports I2C programmability and thermal shutdown. | Requires external I2C host; lacks dedicated PGOOD per channel; lower max output current per rail. | Choose when programmable voltage margins or integrated LDOs for noise-sensitive analog rails are required. |
| RTQ2132BGQW | Triple 3A buck with spread-spectrum clocking; 500kHz–2.2MHz adjustable; includes PMBus interface and comprehensive telemetry. | Higher current, larger 4mm × 4mm QFN; significantly higher BOM cost; over-spec'd for portable battery applications. | Choose for industrial or automotive systems needing telemetry, diagnostics, or >1A per rail - not for space/power-constrained portables. |
Compared with TPS65023RSBR and RTQ2132BGQW, the LTC3545EUD-1#PBF offers the optimal balance of ultra-low quiescent current (58μA), guaranteed –40°C to 125°C operation, and minimal footprint (3mm × 3mm) - making it uniquely suited for Li-ion-powered consumer and medical devices where battery life and board area are primary constraints.
Availability
LTC3545EUD-1#PBF is available at Aetrix Electronics and suitable for smartphone power management, DSL modem PHY supplies, and portable medical instrument designs requiring stable component supply, long-term lifecycle support, and guaranteed extended temperature performance.
Supply support for LTC3545EUD-1#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3545 family was designed specifically for space-constrained, battery-operated portable electronics requiring high-efficiency, multi-rail DC/DC conversion with robust sequencing and ultra-low standby power - reflecting Linear's legacy in precision power solutions.
FAQ
What distinguishes LTC3545EUD-1#PBF from the standard LTC3545?
The LTC3545EUD-1#PBF replaces the SYNC/MODE pin with a third PGOOD output (Pin 9) and permanently configures Burst Mode™ operation - disabling pulse-skipping mode entirely. This guarantees consistent 58μA quiescent current and eliminates external mode-selection components. The standard LTC3545 retains the SYNC/MODE pin for external clock synchronization or manual mode selection. Both share identical pinout, package, and electrical specs except for this functional difference.
Can LTC3545EUD-1#PBF support output voltages below 0.6V?
No. The LTC3545EUD-1#PBF has a fixed 0.6V internal reference voltage, and its feedback architecture requires VFB to be regulated to exactly 0.6V. Output voltage is calculated as VOUT = 0.6V × (1 + R1/R2), meaning the minimum achievable output is 0.6V (when R2 = open and R1 = 0Ω - not recommended). For sub-0.6V rails, an external reference or different regulator architecture is required.
How does thermal performance of LTC3545EUD-1#PBF depend on PCB layout?
Thermal performance of LTC3545EUD-1#PBF is critically dependent on soldering the exposed thermal pad (Pin 17) to a large, multi-layer PCB ground plane. With proper layout (≥4 thermal vias to inner ground layers), θJA is 55°C/W. Poor pad connection raises junction temperature significantly - e.g., unconnected pad increases θJA to >100°C/W, risking thermal shutdown at >400mA per channel in ambient >60°C. Layout guidelines are detailed in Linear's Application Note 138.
Is LTC3545EUD-1#PBF RoHS-compliant and lead-free?
Yes. LTC3545EUD-1#PBF carries the #PBF suffix, indicating it is lead-free and RoHS-compliant per EU Directive 2011/65/EU. The device uses matte tin finish on all leads and conforms to JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), requiring bake-out only if exposed to ambient >30°C/60% RH for >168 hours before reflow.
What is the maximum recommended output capacitance for LTC3545EUD-1#PBF?
The LTC3545EUD-1#PBF supports ceramic output capacitors up to 100μF per channel without stability issues, as its current-mode control loop does not rely on ESR for compensation. Typical designs use 10μF–47μF X5R/X7R ceramics. Larger values improve transient response but increase inrush current during startup - soft-start duration (≈1.1ms) remains effective up to 100μF. Avoid high-voltage-rated (e.g., 25V) ceramics with excessive DC bias derating.
LTC3545EUD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3545EUD-1#PBF FAQ
1.How can I place an order for LTC3545EUD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3545EUD-1#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 LTC3545EUD-1#PBF reliable?
The price and inventory of LTC3545EUD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3545EUD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3545EUD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3545EUD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3545EUD-1#PBF?
LTC3545EUD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3545EUD-1#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 LTC3545EUD-1#PBF?
For technical support, including LTC3545EUD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3545EUD-1#PBF requirements.
6.How does Aetrix verify that LTC3545EUD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3545EUD-1#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 LTC3545EUD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3545EUD-1#PBF?
All LTC3545EUD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3545EUD-1#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 LTC3545EUD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3545EUD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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