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Analog Devices Inc. LTC3565EMSE#TRPBF
- Part No.:
- LTC3565EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3565EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,440
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Product details
Overview
LTC3565EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 1.25A, 4MHz synchronous step-down DC/DC converter optimized for medium-power portable applications. It operates from 2.5V to 5.5V input, delivers adjustable output from 0.6V to 5.5V, features internal 0.15Ω P-channel and 0.13Ω N-channel MOSFETs, and supports Burst Mode operation with 40µA quiescent current. It is used in digital cameras and cellular phones requiring compact, high-efficiency power conversion.
For engineers reviewing the LTC3565EMSE#TRPBF datasheet, LTC3565EMSE#TRPBF pinout, LTC3565EMSE#TRPBF application, or LTC3565EMSE#TRPBF equivalent, key selection criteria include its 10-lead MSOP package, 4MHz max switching frequency enabling sub-1mm-height magnetics, ±7% PGOOD accuracy, 0.6V feedback reference, and support for pre-biased startup - all critical for battery-powered system design.
Technical Context
The LTC3565EMSE#TRPBF employs a constant-frequency current-mode control architecture with external RT-resistor programmability (1.3–4MHz) or external clock synchronization. Its dual-supply architecture separates PVIN (power path) and SVIN (signal bias), enforcing SVIN ≥ PVIN for stable gate drive and error amplifier operation.
It integrates a 0.6V precision bandgap reference, tri-state PGOOD with 40µs blanking and 105µs unblanking delays, and a dedicated ITH compensation node enabling transient response optimization across ceramic capacitor-based output stages. Dropout operation maintains 100% duty cycle with continuous P-channel MOSFET conduction when VIN approaches VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH inputs without external LDO pre-regulation. |
| Output Current | 1.25A continuous - sufficient for core logic rails in handheld instruments and camera ISPs. |
| Switching Frequency | Up to 4MHz - enables use of 1.0–2.2µH inductors ≤1mm height and low-ESR ceramic capacitors for ultra-compact layouts. |
| Feedback Voltage | 0.6V ±2% - sets output via standard resistor divider; enables precise low-voltage rails (e.g., 1.0V, 1.2V, 1.8V) with minimal divider current error. |
| Quiescent Current | 40µA in Burst Mode - extends battery runtime during standby in always-on sensor or RF subsystems. |
| Shutdown Current | <1µA - ensures negligible drain on primary battery during full system sleep or transport mode. |
| PGOOD Accuracy | ±7% window - provides reliable power sequencing and fault detection without external monitoring circuitry. |
| RDS(ON) Top/Bottom | 0.15Ω / 0.13Ω (MSE package) - minimizes conduction loss at 1.25A, supporting >93% peak efficiency at 3.6V→1.8V. |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE), 3mm × 3mm footprint, exposed pad (Pin 11 = GND) requiring PCB solder connection for thermal and electrical integrity. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator timing input | Resistor-to-GND sets switching frequency (1.3–4MHz); open-circuit disables oscillator. |
| RUN (2) | Enable control input | Logic-high (>1.5V) enables regulation; logic-low (<0.3V) forces shutdown with <1µA IQ. |
| SYNC/MODE (3) | Mode selection & sync input | GND = pulse skip; SVIN = Burst Mode; SVIN/2 = forced continuous; external clock = sync source. |
| SW (4) | Power switch node | Connects to inductor; swings between PVIN and GND; requires low-inductance layout to minimize EMI. |
| GND (5, 11) | Main power ground | Pins 5 and 11 (exposed pad) must be tied to common ground plane; exposed pad is mandatory for thermal performance. |
| PVIN (6) | Main power input | High-current path for P-channel MOSFET source; requires local 10µF ceramic decoupling to GND. |
| SVIN (7) | Signal supply input | Bias for control circuitry; must be ≥ PVIN and independently decoupled; failure causes regulation loss. |
| PGOOD (8) | Open-drain status output | Pulled low if VOUT deviates >±7% from setpoint; 15–20Ω pull-down resistance typical for clean logic interfacing. |
| VFB (9) | Feedback input | Compares resistive divider output to 0.6V reference; 50nA input bias enables high-impedance dividers. |
| ITH (10) | Error amplifier output | Compensation node; connects to RC network for loop stability; voltage controls peak inductor current limit. |
Key Features
| Feature | Design Value |
|---|---|
| Internal synchronous MOSFETs | Eliminates external catch diode, reducing BOM count and improving efficiency by up to 8% vs asynchronous designs. |
| Burst Mode operation | Reduces IQ to 40µA at light loads while maintaining regulated output - critical for battery life in display backlight or audio codec bias rails. |
| Pre-biased output support | Enables safe startup into pre-charged VOUT without reverse current flow - required for hot-swap or multi-rail sequencing systems. |
| 100% duty-cycle dropout | Maintains regulation as VIN drops to VOUT + RDS(ON) × IOUT - extends usable battery range in single-cell Li-ion systems down to ~2.8V. |
| Stable with ceramic capacitors | Eliminates need for high-ESR electrolytics; enables smaller, more reliable, and lower-cost output filtering with 10–22µF X5R/X7R ceramics. |
| External frequency programming | RT resistor allows precise frequency tuning to avoid noise-sensitive bands (e.g., AM radio, touch controllers) without changing layout. |
Applications
| Digital Camera Core Power | Cellular Phone Application Processor Rail |
|---|---|
Use Scenario: Powers image signal processor (ISP) and CMOS sensor interface in compact digital cameras with tight height constraints. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.2V @ 1.25A from 3.6V Li-ion battery; operates in forced continuous mode to suppress switching noise near analog imaging circuits. Use Value: 4MHz switching enables 1.0µH inductor ≤1.2mm height, reducing total solution volume by 35% vs 500kHz alternatives while maintaining <25mVp-p ripple. | Use Scenario: Supplies core voltage to application processor in LTE smartphones during active data sessions and idle states. IC Role / Device Role / Timing Role: Main SoC core rail regulator; switches between forced continuous (active) and Burst Mode (idle) via MODE pin to balance noise and efficiency. Use Value: 40µA IQ in Burst Mode extends standby time by >2× compared to fixed-frequency 1MHz converters under 1mA load conditions. |
| Notebook Computer USB-C PD Interface | Handheld Test Instrument Auxiliary Rail |
Use Scenario: Generates 3.3V auxiliary rail from USB-C PD input (5–20V) using upstream buck-boost followed by LTC3565EMSE#TRPBF post-regulation. IC Role / Device Role / Timing Role: Precision post-regulator ensuring stable 3.3V for USB transceivers and Type-C controller; uses PGOOD for fault isolation. Use Value: ±7% PGOOD threshold and 40µs blanking enable reliable USB enumeration without false disconnects during load transients. | Use Scenario: Provides 1.8V logic rail for FPGA configuration and ADC reference in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source for mixed-signal ICs; configured in pulse-skip mode to reduce EMI during sensitive measurement windows. Use Value: Pulse-skip operation reduces conducted emissions by 12dB in 30–100MHz band versus forced continuous mode, easing EMC certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.6V–17V input, 3A output, 2.5MHz fixed frequency; no Burst Mode; higher VIN range but larger 16-pin QFN package. | Suitable for industrial 12V input systems; not recommended for single-cell Li-ion due to minimum VIN = 3.6V. | Select when input exceeds 5.5V or >1.25A output is needed; avoid for space-constrained 2.5–5.5V battery apps. |
| MAX17503GCU+T | 4.5V–60V input, 2.5A output, 100kHz–2.2MHz adjustable frequency; requires external MOSFETs; no integrated PGOOD. | Targeted at wide-input industrial/motor drives; lacks integrated switches and PGOOD, increasing BOM and layout complexity. | Choose only for high-VIN (>12V) applications where external FETs justify cost and board area trade-offs. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3565EMSE#TRPBF offers optimal integration for 2.5–5.5V battery-powered systems: its 10-lead MSOP fits tight spaces, 40µA Burst Mode IQ maximizes runtime, and integrated PGOOD simplifies power sequencing - features neither alternative matches within the same voltage and package class.
Availability
LTC3565EMSE#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3565EMSE#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 and maintains its high-performance analog and power management portfolio. Linear Technology was renowned for precision DC/DC converters, references, and amplifiers targeting demanding industrial and portable applications.
The LTC3565EMSE#TRPBF belongs to Linear's high-frequency synchronous buck regulator family, designed specifically for space-constrained, battery-operated devices needing high efficiency across wide load ranges - from µA standby to 1.25A active operation.
FAQ
What is the maximum supported switching frequency for the LTC3565EMSE#TRPBF?
The LTC3565EMSE#TRPBF supports up to 4MHz switching frequency, programmable via the RT pin resistor or external clock synchronization. This 4MHz capability is guaranteed by design (not production-tested) and subject to duty cycle limits per the formula fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) MHz. At VOUT = 1.8V and VIN(MAX) = 5.5V, the practical limit is ~2.2MHz.
Does the LTC3565EMSE#TRPBF support pre-biased output startup?
Yes, the LTC3565EMSE#TRPBF supports pre-biased output startup. When enabled, it prevents reverse current flow into the output capacitor during startup by controlling gate drive timing. This feature is confirmed in the Applications Information section and validated in Figure G22 of the datasheet, making LTC3565EMSE#TRPBF suitable for hot-swap and multi-rail power systems.
What is the purpose of separate PVIN and SVIN pins on the LTC3565EMSE#TRPBF?
The LTC3565EMSE#TRPBF uses separate PVIN (power input) and SVIN (signal input) pins to isolate high-current power paths from sensitive analog control circuitry. SVIN must be ≥ PVIN and powers the error amplifier, reference, and logic - ensuring stable regulation even under high PVIN ripple or dropouts. This dual-supply architecture improves PSRR and transient immunity beyond single-supply buck regulators.
Can the LTC3565EMSE#TRPBF operate in dropout mode, and what happens to efficiency?
Yes, the LTC3565EMSE#TRPBF operates in dropout mode with 100% duty cycle, turning on the P-channel MOSFET continuously. In this state, VOUT ≈ VIN − (RDS(ON) × IOUT) − IL × DCR. Efficiency remains high (typically >90%) because only conduction losses apply - no switching losses occur. The device sustains regulation down to VIN ≈ VOUT + 0.2V at 1.25A, extending usable battery life in single-cell systems.
What are the thermal limitations of the LTC3565EMSE#TRPBF in the MSOP package?
The LTC3565EMSE#TRPBF in the 10-lead MSOP (MSE) package has θJA = 40°C/W and θJC = 10°C/W. With the exposed pad (Pin 11) properly soldered to a 1-in² copper area, it can dissipate ~1.2W continuously at TA = 85°C before reaching TJ = 125°C. Derating is required above 85°C ambient; the device includes thermal shutdown that activates above 125°C junction temperature to prevent damage.
LTC3565EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.25A
- Frequency - Switching:
- Up to 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3565EMSE#TRPBF FAQ
1.How can I place an order for LTC3565EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3565EMSE#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 LTC3565EMSE#TRPBF reliable?
The price and inventory of LTC3565EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3565EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3565EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3565EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3565EMSE#TRPBF?
LTC3565EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3565EMSE#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 LTC3565EMSE#TRPBF?
For technical support, including LTC3565EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3565EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3565EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3565EMSE#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 LTC3565EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3565EMSE#TRPBF?
All LTC3565EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3565EMSE#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 LTC3565EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3565EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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