My Inquiry
My Account
Analog Devices Inc. LTC3412AEUF#PBF
- Part No.:
- LTC3412AEUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3412AEUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:440
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3412AEUF#PBF from Analog Devices is a monolithic synchronous step-down DC/DC regulator delivering up to 3A output current with 77mΩ P-channel and 65mΩ N-channel internal MOSFETs, programmable switching frequency from 300kHz to 4MHz, ±2% output voltage accuracy, and 64µA quiescent current in Burst Mode - deployed in point-of-load regulation for notebook computers and portable instruments.
For engineers reviewing the LTC3412AEUF#PBF datasheet, LTC3412AEUF#PBF pinout, LTC3412AEUF#PBF application, or LTC3412AEUF#PBF equivalent, key selection criteria include input voltage range (2.25V–5.5V), low dropout operation (100% duty cycle), OPTI-LOOP® compensation, selectable forced continuous/Burst Mode®, and power-good monitoring with ±7.5% threshold.
Technical Context
The LTC3412AEUF#PBF employs constant-frequency current-mode control with internal P-channel (77mΩ) and N-channel (65mΩ) synchronous switches, enabling high-efficiency regulation across 0.8V–5V output range. Its ITH pin controls peak inductor current via error amplifier output, while slope compensation recovery maintains stable operation at >50% duty cycles without reducing maximum output current.
Switching frequency is set by an external resistor on RT or synchronized externally (300kHz–4MHz); SYNC/MODE pin selects Burst Mode (0V–1V clamp), forced continuous (tied to SVIN), or pulse-skipping (grounded). PGOOD monitors output within ±7.5%, and 100% duty cycle supports ultra-low dropout operation during battery sag.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion, USB, and intermediate bus rails without pre-regulation. |
| Output Current | Up to 3A - sufficient for CPU core, GPU, or FPGA I/O rail in portable systems. |
| Switch RDS(ON) | P-FET: 77mΩ, N-FET: 65mΩ - enables >95% efficiency at 3A/2.5V out from 3.3V in, eliminating external Schottky diode. |
| Quiescent Current | 64µA in Burst Mode - extends battery runtime in standby or light-load states. |
| Frequency Range | 300kHz to 4MHz - allows trade-off between small passive size (high-freq) and peak efficiency (low-freq). |
| Output Accuracy | ±2% over temperature - ensures reliable logic-level compliance for 1.8V, 1.2V, or 0.8V core supplies. |
| Duty Cycle | 100% - sustains regulated output down to VOUT + ILOAD × RDS(ON), critical for battery-powered dropout resilience. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with exposed pad (Pin 17 = SGND), rated for –40°C to 125°C junction temperature (θJA = 37°C/W, θJC = 5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SVIN (Pin 1, 11) | Signal Input Supply | Provides bias for control circuitry; must be decoupled to SGND to stabilize reference and error amplifier. |
| PGOOD (Pin 2, 12) | Power Good Output | Open-drain flag pulled low if VOUT deviates >±7.5%; used for system sequencing and fault reporting. |
| ITH (Pin 3, 13) | Error Amplifier Compensation Point | Controls peak inductor current threshold; voltage range 0.2V–1.4V maps directly to current limit setting. |
| VFB (Pin 4, 14) | Feedback Input | Monitors resistive divider output; internal 0.8V reference enables precise VOUT programming from 0.8V upward. |
| RT (Pin 5, 15) | Oscillator Resistor Input | Sets switching frequency via external resistor (e.g., 294kΩ → ~1MHz); enables fine-tuned EMI management. |
| SYNC/MODE (Pin 6, 16) | Mode Select & Sync Input | Selects Burst Mode (0–1V clamp), forced continuous (tied to SVIN), or sync clock input (300kHz–4MHz). |
| RUN/SS (Pin 7, 1) | Enable & Soft-Start Control | Shuts down IC when <0.5V; capacitor to ground sets controlled ramp-up of output current. |
| SGND (Pin 8, 2) | Signal Ground | Reference for all analog circuitry; connects to exposed pad and must tie to PGND at single point. |
| PVIN (Pins 9, 16, 3, 10) | Power Input Supply | High-current VIN path; requires local low-ESR ceramic decoupling to PGND for transient suppression. |
| SW (Pins 10, 11, 14, 15, 4, 5, 8, 9) | Switch Node | Connects to inductor; carries high di/dt square wave; layout must minimize loop area to reduce EMI. |
| PGND (Pins 12, 13, 6, 7) | Power Ground | Return path for high-current PVIN and SW paths; connects to CIN/COUT (–) terminals and exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® with Adjustable Clamp | External voltage (0–1V) on SYNC/MODE sets minimum peak inductor current, enabling precise ripple vs. efficiency trade-off. |
| OPTI-LOOP® Compensation | Adapts loop response dynamically across load and output capacitor variations - eliminates manual compensation redesign. |
| 100% Duty Cycle Low Dropout | Maintains regulation as input drops to VOUT + ILOAD × RDS(ON), extending usable battery voltage range in portable systems. |
| Internal Synchronous Switches | 77mΩ P-FET + 65mΩ N-FET eliminate external diode losses and simplify BOM - no reverse recovery or thermal derating needed. |
| Power Good Monitoring | ±7.5% output window with open-drain output enables safe power sequencing and system-level fault detection. |
Applications
| Point-of-Load Regulation | Notebook Computers |
|---|---|
Use Scenario: Regulating 1.2V/3A core voltage for Intel Core i5 processor under dynamic load. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing transient response and efficiency across 0–3A load steps. Use Value: OPTI-LOOP® ensures <50µs recovery from 0→3A step; 64µA quiescent current minimizes idle power loss. |
Use Scenario: Generating 1.8V/2.5A I/O supply for DDR4 memory subsystem in ultrabook design. IC Role / Device Role / Timing Role: High-density, thermally efficient step-down regulator operating from 3.3V intermediate bus. Use Value: 4mm × 4mm QFN package fits tight board space; 95% peak efficiency reduces thermal load on thin chassis. |
| Portable Instruments | Distributed Power Systems |
Use Scenario: Providing 3.3V/1.5A analog front-end supply in handheld multimeter with 10-year battery life. IC Role / Device Role / Timing Role: Ultra-low IQ regulator enabling long-term measurement mode with periodic wake-up bursts. Use Value: 64µA Burst Mode current extends battery life; PGOOD confirms stable rail before ADC sampling. |
Use Scenario: Local 2.5V/3A supply for FPGA configuration and transceiver banks in modular industrial PLC backplane. IC Role / Device Role / Timing Role: Distributed DC/DC converter synchronized to system clock to avoid beat frequencies in noise-sensitive analog sections. Use Value: External SYNC input enables deterministic EMI alignment; 100% duty cycle maintains rail during brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54331DR | Fixed 570kHz frequency; 3.5A current limit; no Burst Mode; higher 125µA IQ in light load. | Lacks adjustable low-power mode - less suitable for battery-critical portable instruments. | Choose when fixed frequency simplifies EMI filtering and 3.5A headroom is required over 3A. |
| MP2315GJ-Z | 4.5V–28V input; 3A rating; 340kHz–2.2MHz programmable frequency; 26µA IQ in shutdown only. | Wider input range trades off low-VIN capability - cannot operate below 4.5V, excluding single-cell Li-ion use. | Prefer for industrial 12V/24V intermediate bus designs where input voltage exceeds 4.5V. |
Compared with TPS54331DR and MP2315GJ-Z, the LTC3412AEUF#PBF uniquely combines sub-3V input support, 64µA Burst Mode IQ, and 100% duty cycle - making it optimal for compact, battery-powered systems requiring extended runtime and deep dropout resilience.
Availability
LTC3412AEUF#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, notebook computers, and portable instruments requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LTC3412AEUF#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC3412AEUF#PBF belongs to the Power Management product line, engineered specifically for high-efficiency, high-density DC/DC conversion in space-constrained, battery-sensitive applications demanding low IQ and robust transient response.
FAQ
What is the maximum output current capability of the LTC3412AEUF#PBF?
The LTC3412AEUF#PBF delivers up to 3A of continuous output current under typical thermal conditions (TJ ≤ 125°C) with proper PCB layout and copper pour on the exposed pad. Peak current limit is specified at 4.5A to 6A, but sustained 3A operation requires adequate heatsinking - the 4mm × 4mm QFN package has θJC = 5°C/W, so thermal design must ensure junction temperature remains within specification across ambient and load conditions. The LTC3412AEUF#PBF achieves this using low-RDS(ON) internal switches (77mΩ P-FET, 65mΩ N-FET) to minimize conduction loss.
Does the LTC3412AEUF#PBF support synchronization to an external clock?
Yes, the LTC3412AEUF#PBF supports external frequency synchronization via the SYNC/MODE pin, accepting clock signals from 300kHz to 4MHz. When synchronized, the internal oscillator locks to the falling edge of the external clock, and burst clamp is automatically set to 0V. To enable synchronization, the external resistor on the RT pin should be selected for a frequency ~25% lower than the target sync frequency. This feature allows deterministic EMI placement in noise-sensitive systems - a key advantage of the LTC3412AEUF#PBF over fixed-frequency alternatives.
How does Burst Mode® operation improve efficiency at light loads in the LTC3412AEUF#PBF?
In Burst Mode®, the LTC3412AEUF#PBF reduces gate charge and switching losses by disabling the internal power MOSFETs intermittently at light loads, dropping quiescent current to 64µA. The SYNC/MODE pin voltage (0–1V) sets the burst clamp level, which determines the minimum peak inductor current before entering sleep mode. During sleep, most internal circuitry powers down while the output capacitor supplies load current until VOUT droops enough to reactivate regulation. This behavior is confirmed in Figure G02 and G04 of the LTC3412AEUF#PBF datasheet and makes the LTC3412AEUF#PBF ideal for battery-powered standby applications.
What is the purpose of the exposed pad on the LTC3412AEUF#PBF QFN package?
The exposed pad (Pin 17) on the LTC3412AEUF#PBF QFN package is electrically connected to SGND and serves dual thermal and electrical functions: it provides the primary heat dissipation path (θJC = 5°C/W) and acts as the low-impedance return for signal ground. Per the datasheet, this pad must be soldered to a dedicated SGND copper plane on the PCB - not left floating or tied only to PGND. Improper connection degrades both thermal performance and noise immunity, potentially causing instability or premature thermal shutdown. The LTC3412AEUF#PBF's reliability and efficiency depend critically on correct exposed pad implementation.
Can the LTC3412AEUF#PBF operate with an input voltage as low as 2.25V?
Yes, the LTC3412AEUF#PBF is fully specified to operate from 2.25V to 5.5V input, enabling direct regulation from single-cell Li-ion (2.7–4.2V) or low-voltage USB sources. At 2.25V, the device maintains regulation down to VOUT + ILOAD × RDS(ON) via 100% duty cycle operation. However, RDS(ON) increases slightly at low VIN (see Figure G13), so thermal validation is required for 3A loads near 2.25V. This low-VIN capability is a distinguishing feature of the LTC3412AEUF#PBF versus many competing regulators with 3V+ minimum input.
LTC3412AEUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN 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):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LTC3412AEUF#PBF FAQ
1.How can I place an order for LTC3412AEUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3412AEUF#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 LTC3412AEUF#PBF reliable?
The price and inventory of LTC3412AEUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3412AEUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3412AEUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3412AEUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3412AEUF#PBF?
LTC3412AEUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3412AEUF#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 LTC3412AEUF#PBF?
For technical support, including LTC3412AEUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3412AEUF#PBF requirements.
6.How does Aetrix verify that LTC3412AEUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3412AEUF#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 LTC3412AEUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3412AEUF#PBF?
All LTC3412AEUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3412AEUF#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 LTC3412AEUF#PBF part is unused and in its original packaging.
Return procedure for LTC3412AEUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3412AEUF#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
