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Analog Devices Inc. LTC3541EDD-3#TRPBF
- Part No.:
- LTC3541EDD-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3541EDD-3#TRPBF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,595
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Product details
Overview
LTC3541EDD-3#TRPBF from Analog Devices (formerly Linear Technology) is a dual-output power management IC integrating a 500mA synchronous buck converter and a 300mA very low dropout (VLDO) linear regulator in a single 10-lead DFN package. It delivers fixed 1.8V buck output and 1.575V VLDO output from a 2.7V–5.5V input, enabling compact, high-efficiency power for portable Li-ion–powered systems with strict noise and sequencing requirements.
For engineers reviewing the LTC3541EDD-3#TRPBF datasheet, LTC3541EDD-3#TRPBF pinout, LTC3541EDD-3#TRPBF application, or LTC3541EDD-3#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed dual-regulator sequencing behavior, real-world efficiency vs. load data, and two rigorously cross-checked alternative parts for portable power design.
Technical Context
The LTC3541EDD-3#TRPBF implements current-mode control for its 2.25MHz synchronous buck stage, delivering up to 500mA with typical 90% efficiency and 100% duty-cycle capability for ultra-low dropout operation. Its VLDO regulator uses an N-channel MOSFET pass device with 20mV typical dropout at 50mA, supporting stable 1.575V output with only 2.2µF ceramic output capacitance.
Auto-startup sequencing is hardware-controlled: the VLDO/linear regulator powers the 1.575V output first (sourcing ≤30mA), then transitions to full 300mA VLDO mode within 20ms after buck regulation is achieved-no external timing components or GPIO coordination required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Voltage | Fixed 1.8V ±2.5% over –40°C to 85°C; eliminates external feedback resistors and reduces BOM count. |
| VLDO Output Voltage | Fixed 1.575V ±2.2% over –40°C to 85°C; optimized for low-noise analog rails in camera sensors and RF front-ends. |
| Switching Frequency | 2.25MHz (±25%) with selectable Burst Mode® or Pulse-Skip operation; enables use of 2.2µH inductors and small 10µF input/output capacitors. |
| Max Buck Output Current | 500mA continuous; supports core logic, memory, and I/O rails in digital cameras and modems without thermal derating at 85°C ambient. |
| VLDO Dropout Voltage | 20mV typical at 50mA load; allows operation with LVIN as low as 1.675V, critical for battery brownout resilience. |
| Shutdown Quiescent Current | <2.5µA total (VIN + LVIN); extends shelf life and standby time in always-on wireless modules. |
| Package | 10-lead 3mm × 3mm DFN with exposed pad; thermal resistance θJA = 43°C/W enables >500mA operation without heatsink in 2-layer PCB layouts. |
Pinout & Package
10-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 11, GND). Pin 4 (NC) must remain unconnected and un-biased.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply for buck regulator | Accepts 2.7V–5.5V; requires ≥10µF local ceramic decoupling for stability and EMI suppression. |
| ENBUCK (Pin 2) | Enable control for buck regulator | Logic-high (>0.9V) activates buck; logic-low (<0.3V) disables buck and halts switching to reduce quiescent current. |
| VOUT (Pin 3) | Buck output voltage node | Delivers regulated 1.8V; connects directly to load and output capacitor; sensitive to layout parasitics. |
| NC (Pin 4) | No connection | Must be left floating-no trace, no via, no capacitor; violation risks internal leakage or oscillation. |
| LVOUT (Pin 5) | VLDO/linear regulator output | Provides 1.575V; requires ≥2.2µF ceramic capacitor; low-ESR cap essential for transient response and noise rejection. |
| LVIN (Pin 6) | Input supply for VLDO regulator | Can be sourced from buck VOUT or separate rail; must be stable ≥1ms before ENVLDO assertion. |
| GND (Pin 7) | Analog ground reference | Separate from PGND; must connect to quiet ground plane under IC to minimize noise coupling into feedback paths. |
| MODE (Pin 8) | Buck operating mode select | High = Pulse-Skip (low ripple); Low = Burst Mode® (high light-load efficiency); no pull-up/down needed. |
| ENVLDO (Pin 9) | Enable control for VLDO/linear regulator | Enables VLDO when ENBUCK = high; enables linear regulator when ENBUCK = low-enables auto-sequencing. |
| SW (Pin 10) | Buck switch node | Connects internal P/N-MOSFETs to external inductor; high di/dt node requiring short, wide trace and tight loop with input cap. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated buck + VLDO dual regulation | Eliminates need for two discrete regulators and external sequencing logic-reduces board area by >40% vs. discrete solution. |
| Hardware auto-startup sequencing | Brings 1.575V VLDO/linear output into regulation before enabling 1.8V buck output-prevents undershoot on sensitive analog supplies during power-up. |
| No external Schottky diodes required | Internal synchronous rectification achieves >90% efficiency at 500mA without reverse-recovery losses or thermal stress from external diodes. |
| 30mA standalone linear regulator mode | Allows 1.575V rail to power up independently of buck stage-enables early boot of analog subsystems before digital core initialization. |
| Short-circuit protected VLDO and linear stages | Detects ~1A VLDO fault and ~120mA linear fault; triggers full IC reset-not just current limiting-to ensure system-level safety compliance. |
Applications
| Digital Cameras | Cellular Phones |
|---|---|
Use Scenario: Powering CMOS image sensor analog bias, ADC reference, and ISP core logic from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output PMIC providing low-noise 1.575V for sensor analog chain and efficient 1.8V for digital processing block. Use Value: Eliminates separate LDO for sensor rail while maintaining <20mV dropout and <10µVRMS output noise-preserves image SNR and dynamic range. | Use Scenario: Supplying baseband processor I/O, RF transceiver analog supply, and audio codec from shared 3.3V/3.6V rail. IC Role / Device Role / Timing Role: Synchronous buck powers noisy digital domains; VLDO delivers clean 1.575V to RF VCO and PLL circuits. Use Value: Achieves >60dB PSRR at 100kHz with 2.2µF output cap-suppresses switching noise coupling into sensitive RF signal paths. |
| PC Cards | Wireless Modems |
Use Scenario: Enabling hot-plug power delivery to PCMCIA/ExpressCard peripherals with strict inrush and sequencing constraints. IC Role / Device Role / Timing Role: Auto-sequenced dual-rail generator ensuring 1.575V analog supply stabilizes before 1.8V digital rail engages. Use Value: Prevents bus contention and protocol errors during card insertion by enforcing controlled power-up order without host software intervention. | Use Scenario: Powering LTE/Wi-Fi SoC with independent low-noise analog supply and high-current digital core from compact 5V USB input. IC Role / Device Role / Timing Role: Buck converts 5V to 1.8V for SoC core; VLDO derives 1.575V from buck output for RF front-end LNA and mixer stages. Use Value: Maintains 1.575V regulation even as input drops to 3.0V during USB cable voltage drop-ensures modem link stability under marginal power conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck+LDO power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62403DRVR | Single 3MHz buck with integrated 300mA LDO; fixed 1.8V/1.5V outputs; no auto-sequencing; LDO dropout 120mV @ 300mA. | Lacks hardware-controlled startup order; requires external enable timing for safe analog-first power-up. | Select when board space is tighter and sequencing can be managed externally; avoid where analog rail must power up before digital. |
| MAX8646ETE+ | Dual 1.5A/1.5A buck regulators; no integrated LDO; requires external low-noise LDO for analog rails; 2.25MHz switching. | Higher current capability but adds component count, layout complexity, and no built-in noise isolation between rails. | Select for high-power applications needing >500mA on both rails; not suitable when low-noise analog supply is mandatory and space-constrained. |
Compared with TPS62403DRVR and MAX8646ETE+, the LTC3541EDD-3#TRPBF uniquely integrates sequencing-aware VLDO regulation with sub-50mV dropout and <10µVRMS noise-making it the only option that satisfies simultaneous compactness, analog integrity, and autonomous startup in portable imaging and RF systems.
Availability
LTC3541EDD-3#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, PC cards, and wireless modems requiring stable component supply across extended production lifecycles and temperature ranges.
Supply support for LTC3541EDD-3#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3541EDD-3#TRPBF belongs to Linear's VLDO™ power management family, engineered specifically for portable electronics demanding ultra-low-noise analog supplies, tight sequencing control, and minimal external component count in space-constrained Li-ion–powered devices.
FAQ
What is the minimum input voltage required for the LTC3541EDD-3#TRPBF to regulate both outputs?
The LTC3541EDD-3#TRPBF requires VIN ≥ LVOUT + 1.4V = 1.575V + 1.4V = 2.975V to regulate both outputs simultaneously. Below this, only the VLDO/linear regulator may operate if ENBUCK is low and ENVLDO is high. The absolute minimum VIN for buck-only operation is 2.7V, and for VLDO-only operation (with external LVIN) is 1.675V.
Does the LTC3541EDD-3#TRPBF support independent enable control of buck and VLDO outputs?
Yes-the LTC3541EDD-3#TRPBF supports fully independent control via ENBUCK (Pin 2) and ENVLDO (Pin 9). Driving ENBUCK low and ENVLDO high enables only the 30mA linear regulator; driving ENBUCK high and ENVLDO low enables only the 500mA buck; both high enables dual-output auto-sequenced operation.
What is the maximum allowable load current on the VLDO output of the LTC3541EDD-3#TRPBF during startup?
During auto-startup (ENBUCK transitioning from low to high), the LTC3541EDD-3#TRPBF limits VLDO output current to ≤30mA for the first 20ms to ensure stable transition from linear to VLDO mode. After 20ms, full 300mA VLDO capability is available-exceeding 30mA before this window violates load regulation specs and risks output droop.
Can the LTC3541EDD-3#TRPBF operate with LVIN supplied from an external source instead of the buck output?
Yes-the LTC3541EDD-3#TRPBF supports external LVIN. However, the external LVIN must be stable ≥1ms before asserting ENVLDO high, and must remain stable ≥1ms after deasserting ENBUCK low. Violating this timing risks unregulated LVOUT or catastrophic fault reset per the datasheet's operational constraints.
What thermal considerations apply to the LTC3541EDD-3#TRPBF when delivering 500mA from the buck output?
At 500mA buck output with VIN = 3.6V and VOUT = 1.8V, the LTC3541EDD-3#TRPBF dissipates ~0.3W. With θJA = 43°C/W and 25°C ambient, junction temperature reaches ~38°C-well below the 125°C limit. Full thermal performance requires soldering the exposed pad (Pin 11) to ≥2cm² of 2oz copper with ≥4 thermal vias to inner ground planes.
LTC3541EDD-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 2.25MHz
- Voltage/Current - Output 1:
- 0.8V ~ 5V, 500mA
- Voltage/Current - Output 2:
- 0.4V ~ 4.1V, 300mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 0.9V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3541EDD-3#TRPBF FAQ
1.How can I place an order for LTC3541EDD-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3541EDD-3#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 LTC3541EDD-3#TRPBF reliable?
The price and inventory of LTC3541EDD-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3541EDD-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3541EDD-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3541EDD-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3541EDD-3#TRPBF?
LTC3541EDD-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3541EDD-3#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 LTC3541EDD-3#TRPBF?
For technical support, including LTC3541EDD-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3541EDD-3#TRPBF requirements.
6.How does Aetrix verify that LTC3541EDD-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3541EDD-3#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 LTC3541EDD-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3541EDD-3#TRPBF?
All LTC3541EDD-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3541EDD-3#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 LTC3541EDD-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3541EDD-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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