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Analog Devices Inc. LTC3541EDD-3#PBF
- Part No.:
- LTC3541EDD-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3541EDD-3#PBF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,978
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Product details
Overview
LTC3541EDD-3#PBF 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 such as digital cameras and cellular phones.
For engineers reviewing the LTC3541EDD-3#PBF datasheet, LTC3541EDD-3#PBF pinout, LTC3541EDD-3#PBF application, or LTC3541EDD-3#PBF equivalent, key selection considerations include auto-startup sequencing, 2.25MHz constant-frequency operation, 100% duty-cycle capability, <3µA shutdown current, and thermal/short-circuit protection across both regulators.
Technical Context
The LTC3541EDD-3#PBF implements a current-mode synchronous buck architecture with internal P- and N-channel MOSFETs (RDS(ON) = 0.25Ω / 0.35Ω), operating at 2.25MHz nominal frequency (1.8–2.7MHz range). Its VLDO regulator uses an N-channel pass device with 20–50mV dropout at 50mA and supports standalone 30mA linear mode when the buck is disabled.
Control logic enables three operational modes via ENBUCK, ENVLDO, and MODE pins: independent buck-only, independent VLDO/linear-only, or coordinated dual-output with auto-sequenced startup-where the 1.575V VLDO output reaches regulation before enabling the 1.8V buck output, eliminating external sequencing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Voltage | Fixed 1.8V ±2.5% over –40°C to 85°C; enables stable core supply for low-voltage processors. |
| VLDO Output Voltage | Fixed 1.575V ±2.3% over –40°C to 85°C; provides low-noise analog rail for sensors or RF circuitry. |
| Switching Frequency | 2.25MHz typical; allows use of small 2.2µH inductors and 2.2µF ceramic output capacitors. |
| Buck Max Output Current | 500mA continuous; sufficient to power both VLDO input and external loads from single input. |
| VLDO Dropout Voltage | 20–50mV at 50mA load; enables regulation down to LVIN = 1.625V, critical for battery end-of-life operation. |
| Shutdown Current | <3µA total (VIN + LVIN); extends battery life in standby states of portable devices. |
| Package | 10-lead 3mm × 3mm DFN with exposed pad; achieves θJA = 43°C/W for thermally constrained layouts. |
Pinout & Package
10-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 11, GND). Pin 4 is NC and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main input supply | Accepts 2.7V–5.5V; requires ≥10µF local decoupling for buck stability. |
| ENBUCK (Pin 2) | Buck enable control | Logic-high enables 500mA buck; logic-low disables buck and initiates auto-sequenced VLDO-first startup. |
| VOUT (Pin 3) | Buck output | Delivers regulated 1.8V; connects directly to load and output capacitor. |
| NC (Pin 4) | No connection | Must be left floating-no trace, no capacitor, no pull-up/down. |
| LVOUT (Pin 5) | VLDO/linear output | Provides 1.575V; supports 300mA VLDO or 30mA linear mode depending on ENBUCK state. |
| LVIN (Pin 6) | VLDO input supply | Accepts 1.675V–5.5V; may be sourced from buck VOUT or separate rail. |
| GND (Pin 7) | Analog ground | Reference for feedback and control circuits; tied to exposed pad. |
| MODE (Pin 8) | Buck operation mode select | High = pulse-skip (low-noise); low = Burst Mode® (high light-load efficiency). |
| ENVLDO (Pin 9) | VLDO/linear enable | High enables VLDO when ENBUCK=high, or linear regulator when ENBUCK=low. |
| SW (Pin 10) | Buck switch node | Connects internal MOSFETs to external inductor; requires tight layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-startup sequencing | Brings 1.575V VLDO output into regulation before enabling 1.8V buck output-no external timing components required. |
| No external Schottky diodes | Integrated synchronous rectification eliminates conduction loss and board space for external diodes. |
| Thermal & short-circuit protection | Independent fault detection disables VLDO or linear regulator at ~160°C junction or ~1A/~120mA overload; device resets on fault clear. |
| Low-noise VLDO output | Stable with only 2.2µF ceramic output capacitor; supports noise-sensitive analog/RF loads without added filtering. |
| 100% duty-cycle operation | Maintains regulation down to VIN ≈ VOUT; extends usable battery voltage range in Li-ion applications. |
Applications
| Digital Cameras | Cellular Phones |
|---|---|
Use Scenario: Powering image sensor, ISP, and flash LED drivers from single-cell Li-ion battery. IC Role / Device Role / Timing Role: Dual-rail PMIC delivering clean 1.575V analog supply and efficient 1.8V digital core voltage with automatic sequencing. Use Value: Eliminates discrete LDO + buck combo; reduces BOM count by 4+ components while maintaining <50mV dropout under full load. | Use Scenario: Supplying baseband processor core (1.8V) and RF transceiver bias (1.575V) in slim handset designs. IC Role / Device Role / Timing Role: Integrated power solution providing simultaneous, sequenced outputs with Burst Mode® for talk-time extension. Use Value: Achieves >90% peak buck efficiency at 500mA and <3µA shutdown current-extending standby time beyond 14 days. |
| PC Cards | Wireless Modems |
Use Scenario: Regulating host interface (1.8V) and card controller I/O (1.575V) in hot-pluggable PCMCIA/ExpressCard slots. IC Role / Device Role / Timing Role: Single-chip dual-output regulator with independent enable controls for hot-swap compliance and power-domain isolation. Use Value: Enables rapid 1.575V rail establishment prior to 1.8V domain activation-preventing I/O contention during insertion. | Use Scenario: Powering ADSL/DSL line driver (1.575V) and PHY/MAC (1.8V) in compact broadband modems. IC Role / Device Role / Timing Role: High-density PMIC supporting wide input range (3V–5.5V) and robust thermal management in enclosed plastic enclosures. Use Value: Exposed-pad DFN package dissipates heat effectively at full load-maintaining <85°C case temperature without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck+LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3542EDD-3#PBF | Same pinout, identical 1.8V/1.575V outputs, but adds independent soft-start control and improved load transient response. | Preferred for systems requiring programmable ramp rates or tighter output voltage tolerance (<±1.5%). | Select when design demands enhanced transient immunity or custom startup timing-no PCB change needed. |
| TPS62231DRYT | Single 1.8V buck only (no VLDO); 6-pin WSON; 3MHz switching; 400mA output; no linear regulator mode. | Suitable only for 1.8V-only applications; requires external LDO for 1.575V rail. | Choose if dual-rail functionality is unnecessary and board area is more constrained than BOM count. |
Compared with LTC3541EDD-3#PBF, LTC3542EDD-3#PBF offers superior transient performance and soft-start flexibility at identical footprint, while TPS62231DRYT reduces cost and size for single-rail use cases-but cannot replace the integrated VLDO function.
Availability
LTC3541EDD-3#PBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and wireless modems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3541EDD-3#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear-branded power ICs.
The LTC3541EDD-3#PBF belongs to Linear's high-efficiency dual-output PMIC family, designed specifically for space-constrained portable electronics needing coordinated, low-noise, battery-optimized power rails.
FAQ
What is the minimum input voltage required for the LTC3541EDD-3#PBF to regulate both outputs?
The LTC3541EDD-3#PBF requires VIN ≥ LVOUT + 1.4V = 1.575V + 1.4V = 2.975V to regulate both outputs simultaneously. For VLDO-only operation (with ENBUCK = low), LVIN ≥ LVOUT + VDROPOUT = 1.575V + 0.02V = 1.595V suffices. The datasheet specifies absolute minimum VIN as 2.7V, but full dual-output regulation begins above 2.975V.
How does the auto-startup sequence work in the LTC3541EDD-3#PBF?
When both ENBUCK and ENVLDO are high, the LTC3541EDD-3#PBF first enables its 30mA linear regulator to bring LVOUT to 1.575V. Within 20ms, it transitions to the 300mA VLDO regulator while simultaneously enabling the 1.8V buck output-ensuring the analog rail is stable before digital power is applied, preventing system reset or I/O contention.
Can the LTC3541EDD-3#PBF operate with only the VLDO output active and the buck disabled?
Yes. With ENBUCK = low and ENVLDO = high, the LTC3541EDD-3#PBF activates only the 30mA linear regulator, sourcing 1.575V from VIN directly. This mode draws just 50µA quiescent current and supports applications needing only a low-noise auxiliary rail without buck conversion.
What is the maximum allowable LVIN–VIN differential for the LTC3541EDD-3#PBF?
The absolute maximum LVIN – VIN differential is +0.3V, per Absolute Maximum Ratings. Exceeding this risks damage to internal level-shifting circuitry. In practice, LVIN should equal or be slightly less than VIN-especially when LVIN is sourced from the buck output-to ensure reliable operation and avoid overstress.
Does the LTC3541EDD-3#PBF require external compensation components?
No. The LTC3541EDD-3#PBF integrates internal compensation for both the buck and VLDO/linear regulator loops. It is stable with output capacitors from 2.2µF to 100µF (ceramic), eliminating external compensation networks and simplifying layout-verified across temperature and load conditions in the datasheet.
LTC3541EDD-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3541EDD-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3541EDD-3#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 LTC3541EDD-3#PBF reliable?
The price and inventory of LTC3541EDD-3#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3541EDD-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3541EDD-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3541EDD-3#PBF?
LTC3541EDD-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3541EDD-3#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 LTC3541EDD-3#PBF?
For technical support, including LTC3541EDD-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3541EDD-3#PBF requirements.
6.How does Aetrix verify that LTC3541EDD-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3541EDD-3#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 LTC3541EDD-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3541EDD-3#PBF?
All LTC3541EDD-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3541EDD-3#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 LTC3541EDD-3#PBF part is unused and in its original packaging.
Return procedure for LTC3541EDD-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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