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Analog Devices Inc. LTC3565EMSE#PBF
- Part No.:
- LTC3565EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3565EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.25A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,335
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Product details
Overview
LTC3565EMSE#PBF from Analog Devices (formerly Linear Technology) is a constant-frequency, synchronous step-down DC/DC converter designed for medium-power portable applications. It operates from 2.5V to 5.5V input, delivers up to 1.25A output current, supports up to 4MHz switching frequency, features adjustable 0.6V–5.5V output voltage, and integrates low-RDS(ON) P-channel and N-channel MOSFETs (0.15Ω / 0.13Ω). It powers core rails in digital cameras and cellular handsets where compact size and high efficiency at light load are critical.
For engineers reviewing the LTC3565EMSE#PBF datasheet, LTC3565EMSE#PBF pinout, LTC3565EMSE#PBF application, or LTC3565EMSE#PBF equivalent, key selection criteria include its Burst Mode™ IQ of 40µA, 10-lead MSOP package with exposed pad, 0.6V feedback reference, ±7% PGOOD threshold, and RT-programmable oscillator enabling optimization of inductor/capacitor size versus efficiency trade-offs.
Technical Context
The LTC3565EMSE#PBF employs a current-mode control architecture with external compensation via the ITH pin, enabling stable loop response across wide load and output capacitor ranges. Its dual supply design separates PVIN (power path) from SVIN (signal logic), requiring SVIN ≥ PVIN and supporting pre-biased output startup.
Three selectable operating modes-Burst Mode™ (40µA IQ), pulse-skipping, and forced continuous-are controlled by the SYNC/MODE pin voltage relative to SVIN. The device enters 100% duty-cycle dropout when VIN approaches VOUT and includes undervoltage lockout (1.9V to 2.2V) and short-circuit protection.
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 battery inputs |
| IOUT Max | 1.25A - sufficient for powering FPGA I/O banks, camera ISPs, or baseband processors |
| fSW Max | 4MHz - enables use of sub-1mm-height inductors (e.g., 1.0–2.2µH) and 10–22µF ceramic output capacitors |
| VFB | 0.6V ±2% - sets output via resistor divider; allows precise 1.2V, 1.8V, 3.3V, or custom rail generation |
| RDS(ON) Top/Bottom | 0.15Ω / 0.13Ω (MSE) - minimizes conduction loss at full load; enables >95% peak efficiency at 3.6V→1.8V/1.25A |
| IQ (Burst Mode) | 40µA - extends battery runtime in standby/sleep states without compromising transient response |
| PGOOD Threshold | ±7% of VOUT - provides reliable power-good signaling for system sequencing and fault detection |
| Shutdown Current | <1µA - ensures negligible drain during deep sleep or system off states |
Pinout & Package
Package: 10-Lead Plastic MSOP (MSE) with exposed thermal pad (Pin 11 = GND), 3mm × 3mm footprint, 1.1mm max height - optimized for space-constrained handheld PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. RT | Timing resistor connection | Sets oscillator frequency (1.3–4MHz) via external resistor to GND; enables size/efficiency tuning |
| 2. RUN | Enable control input | High >1.5V enables regulation; low <0.3V forces shutdown (<1µA IQ); must not float |
| 3. SYNC/MODE | Mode selection & sync input | Voltage level selects Burst Mode™ (SVIN), pulse skip (GND), or forced continuous (0.5×SVIN); accepts external clock up to 4MHz |
| 4. SW | Switch node | Connects to inductor; swings between PVIN and GND; requires low-inductance layout to minimize EMI |
| 5. GND | Main power ground | Reference for PVIN, SVIN, and output filter; exposed pad (Pin 11) must be soldered to PCB ground plane for thermal and electrical performance |
| 6. PVIN | Main power input | Supplies high-current switch path; requires local 10µF+ ceramic decoupling close to pin |
| 7. SVIN | Signal power supply | Powers internal logic and error amplifier; must be ≥ PVIN and independently decoupled |
| 8. PGOOD | Open-drain status output | Pulled low when VOUT deviates >±7%; 40µs blanking on turn-on prevents false triggering |
| 9. VFB | Feedback input | Compares divided VOUT to 0.6V reference; sets output voltage via R1/R2 divider |
| 10. ITH | Error amplifier compensation | Controls peak inductor current; external RC network sets loop bandwidth and phase margin |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces quiescent current to 40µA at light loads while preserving fast load-transient response via automatic mode switching |
| 100% Duty-Cycle Dropout | Maintains regulation as input drops to VOUT + ILOAD×RDS(ON), eliminating brownout during battery sag |
| Pre-Biased Output Support | Enables safe startup into an already charged output rail-critical for hot-swap and multi-rail sequencing |
| Stable with Ceramic Capacitors | Eliminates need for high-ESR electrolytics; reduces board area, cost, and aging-related failure modes |
| External Frequency Programming | RT pin allows precise oscillator tuning (1.3–4MHz) to balance EMI, efficiency, and component size |
| Independent PVIN/SVIN Supplies | Isolates noisy power-switching currents from sensitive analog/feedback circuitry, improving noise immunity |
Applications
| Digital Camera Core Rail | Cellular Phone Application Processor |
|---|---|
Use Scenario: Powers image signal processor (ISP) and sensor interface in compact digital cameras with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 1.2V/1.25A with tight ripple control and fast transient response to handle burst capture loads. Use Value: 4MHz operation enables 1.0µH inductor and 10µF ceramic output cap, reducing solution size by >40% vs. 1MHz designs while maintaining >92% efficiency at 500mA. | Use Scenario: Supplies core voltage to application processor in 4G/LTE smartphones during active and idle states. IC Role / Device Role / Timing Role: High-efficiency buck converter with Burst Mode™ for extended standby time and forced continuous mode for noise-sensitive RF sections. Use Value: 40µA IQ in Burst Mode™ extends battery life by >30 hours in standby; ±7% PGOOD ensures reliable SoC reset sequencing. |
| Notebook Computer USB-C PD Sink | Handheld Test Instrument Power Management |
Use Scenario: Regulates 5V USB-C Power Delivery input down to 3.3V for microcontroller and interface ICs in ultraportable notebooks. IC Role / Device Role / Timing Role: Input-stage buck converter handling variable 5–20V PD input (via companion controller), stepping to fixed 3.3V rail. Use Value: Wide 2.5–5.5V input range accommodates 5V-only PD negotiation; 0.6V feedback reference enables accurate 3.3V output with 0.5% tolerance over temperature. | Use Scenario: Provides clean, regulated 1.8V and 3.3V rails for precision ADCs, DACs, and microcontrollers in battery-powered handheld test gear. IC Role / Device Role / Timing Role: Dual-rail power source using two LTC3565EMSE#PBFs-one per voltage-with independent mode control. Use Value: Low 25mVp-p ripple in forced continuous mode ensures <1 LSB error in 16-bit ADCs; exposed-pad MSOP aids thermal management in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | Fixed 3.3V output; 3.6V–17V input; 3A rating; no RT programming; lower IQ (18µA) | Not adjustable-requires redesign for non-3.3V rails; better suited for higher-input industrial supplies | Select if fixed 3.3V output and wider input range are acceptable and PCB layout allows larger 3mm × 3mm QFN |
| MP2143DJ-LF-Z | 2.5V–5.5V input; 3A rating; 2.2MHz fixed frequency; no Burst Mode™; higher RDS(ON) (0.18Ω/0.12Ω) | Lacks ultra-low-IQ mode-unsuitable for battery standby; higher conduction loss at 1.25A | Choose only if 3A headroom and simpler fixed-frequency control outweigh efficiency and light-load IQ requirements |
Compared with TPS62130ARGTR and MP2143DJ-LF-Z, the LTC3565EMSE#PBF uniquely combines adjustable output, 4MHz programmability, 40µA Burst Mode™ IQ, and dual-supply (PVIN/SVIN) isolation-making it optimal for space- and battery-life-constrained portable designs requiring multiple rail voltages.
Availability
LTC3565EMSE#PBF is available at Aetrix Electronics and suitable for digital cameras, cellular handsets, and handheld instruments requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3565EMSE#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. (ADI) acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous testing and automotive-grade reliability standards.
The LTC3565 belongs to Linear's precision monolithic DC/DC converter family, engineered specifically for portable, battery-powered systems demanding high efficiency across full load range, minimal board area, and robust transient behavior under dynamic loads.
FAQ
What is the maximum supported switching frequency for the LTC3565EMSE#PBF?
The LTC3565EMSE#PBF supports up to 4MHz switching frequency, programmable via the RT pin resistor. While 4MHz operation is guaranteed by design, production testing covers 1.3–1.7MHz; higher frequencies require validation per application conditions including minimum on-time and duty cycle constraints (fO(MAX) ≈ 6.67 × VOUT/VIN(MAX) MHz).
Does the LTC3565EMSE#PBF support pre-biased output startup?
Yes, the LTC3565EMSE#PBF supports pre-biased output startup. Its control architecture prevents reverse current flow during start-up into an already charged output rail, making it suitable for systems with multi-rail sequencing or hot-swap requirements without external diode protection.
What is the function of the separate PVIN and SVIN pins on the LTC3565EMSE#PBF?
PVIN supplies the high-current power switches, while SVIN powers the internal analog and digital control circuitry. This separation isolates noise-sensitive feedback and error amplifier paths from switching transients, improving stability and noise immunity-especially critical when using ceramic output capacitors.
How does the SYNC/MODE pin configure operating modes on the LTC3565EMSE#PBF?
The SYNC/MODE pin configures three modes: tie to SVIN for Burst Mode™ (40µA IQ), tie to GND for pulse-skipping, or bias to 0.5×SVIN for forced continuous operation. It also accepts external clock signals up to 4MHz for synchronization-enabling EMI reduction in noise-sensitive systems.
What thermal considerations apply to the LTC3565EMSE#PBF in MSOP package?
The LTC3565EMSE#PBF in 10-lead MSOP has θJA = 40°C/W and θJC = 10°C/W. The exposed pad (Pin 11) must be soldered to a PCB thermal plane. For 1.25A continuous output at 3.6V→1.8V, junction temperature rise is ~25°C above ambient-ensuring reliable operation within the –40°C to 125°C junction range when layout guidelines are followed.
LTC3565EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3565EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3565EMSE#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 LTC3565EMSE#PBF reliable?
The price and inventory of LTC3565EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3565EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3565EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3565EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3565EMSE#PBF?
LTC3565EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3565EMSE#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 LTC3565EMSE#PBF?
For technical support, including LTC3565EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3565EMSE#PBF requirements.
6.How does Aetrix verify that LTC3565EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3565EMSE#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 LTC3565EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3565EMSE#PBF?
All LTC3565EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3565EMSE#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 LTC3565EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3565EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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