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Analog Devices Inc. LT3154AV#PBF
- Part No.:
- LT3154AV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
LT3154AV#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,338
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Product details
Overview
LT3154AV#PBF from Analog Devices is a 6A synchronous buck-boost DC/DC converter with single-inductor architecture, operating from 1.8V to 5.5V input and delivering adjustable 1.8V–5.5V output. It features 17μA Burst Mode quiescent current, 2.2MHz default switching frequency, and integrated 16-pin LQFN (3mm × 3mm) power switches with 18mΩ low-side and 25mΩ high-side RDS(ON). It enables compact, high-efficiency power in battery-powered handheld instruments and RF transmitters.
For engineers reviewing the LT3154AV#PBF datasheet, LT3154AV#PBF pinout, LT3154AV#PBF application, or LT3154AV#PBF equivalent, key selection criteria include VIN/VOUT overlap capability, programmable UVLO threshold (1.155–1.245V), soft-start timing via external capacitor, 5.4–8.7A average inductor current limit, and thermal performance in the 3mm × 3mm LQFN package with exposed PGND pad.
Technical Context
The LT3154AV#PBF implements a four-switch synchronous buck-boost topology with average current mode control, enabling seamless transition between buck, buck-boost, and boost modes without discontinuity in inductor current or loop transfer function. Its proprietary PWM algorithm maintains regulation when VIN is above, below, or equal to VOUT.
It integrates dual N-channel and dual P-channel MOSFETs with matched gate drivers, internal 1V reference for FB pin, and a transconductance error amplifier (110μS) with VC pin for loop compensation. The SYNC/MODE pin selects between Burst Mode (17μA IQ), forced PWM, or external clock synchronization (0.5–4MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, and USB-powered systems without pre-regulation. |
| VOUT Range | 1.8V to 5.5V, adjustable via resistor divider - enables direct replacement of multiple fixed-output regulators. |
| Continuous Output Current | Up to 6A - sustained delivery at full load with thermal management via exposed PGND pad. |
| Quiescent Current (Burst Mode) | 17μA - extends battery life in always-on portable instrumentation with light-load standby. |
| Switching Frequency | Programmable 0.5–4MHz (default 2.2MHz) - balances efficiency vs. size: 2.2MHz allows ≤1μH inductors and <100μF output caps. |
| Feedback Voltage | 0.97V to 1.01V (typ. 0.99V) - tight 2% tolerance ensures ±1.5% output accuracy over temperature and line/load. |
| UVLO Threshold | Rising: 1.155–1.245V - programmable turn-on point prevents brownout during battery discharge. |
Pinout & Package
The LT3154AV#PBF is housed in a thermally enhanced 16-lead LQFN package (3mm × 3mm × 0.74mm) with exposed PGND pad (Pin 17) requiring PCB soldering for thermal and electrical integrity. Pin pitch is 0.5mm; footprint matches standard 3mm × 3mm QFN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (1,2) | Power input supply rail | High-current path for buck-boost power stage; must be connected directly to VIN and decoupled with ≥22μF low-ESR capacitor. |
| VIN (3) | Signal input voltage reference | Low-noise bias for control circuitry; decoupled with ≥1μF capacitor to suppress noise coupling into feedback loop. |
| EN/UVLO (4) | Enable and undervoltage lockout input | Configurable startup threshold (1.155–1.245V rising); hysteresis ensures clean turn-on/turn-off during battery sag. |
| SYNC/MODE (5) | Mode selection and clock sync | Logic-controlled pin: High = forced PWM, Low = Burst Mode, External CLK = synchronized operation (75ns min pulse width). |
| RT (6) | Oscillator frequency programming | Resistor-to-GND sets fSW; 49.9kΩ yields 2.2MHz; connect to VIN for default frequency. |
| GND (7) | Signal ground reference | Low-noise return for analog control circuits; must be isolated from PGND except at single-point connection. |
| SS (8) | Soft-start timing control | Capacitor-to-GND sets ramp time (tSS = 0.8 × CSS in nF); default 2.2ms when tied to VIN. |
| FB (9) | Output voltage feedback node | Monitors resistive divider; 0.99V reference enables precise VOUT setting (e.g., 3.3V with 332kΩ/1MΩ divider). |
| VC (10) | Error amplifier output | Provides loop compensation node; RC/CC network required for stability across all operating modes. |
| VOUT (11) | Signal output voltage reference | Low-noise sensing point for regulation; must be connected to PVOUT in layout. |
| PVOUT (12) | Power output supply rail | High-current output path; requires ≥68μF low-ESR capacitor (value scales with VOUT and load per Table 3). |
| SW2 (13) | Switch node (buck-boost inductor connection) | Connects to one end of power inductor; switches with SW1 to implement four-switch topology. |
| PGND (14,15,17) | Power ground return | Thermal and electrical ground for power switches; exposed pad (Pin 17) must be soldered to PCB ground plane. |
| SW1 (16) | Switch node (buck-boost inductor connection) | Paired with SW2; complementary switching action enables bidirectional energy transfer in buck-boost mode. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost architecture | Eliminates need for separate buck + boost stages; reduces BOM count, board area, and EMI sources in space-constrained designs. |
| 17μA Burst Mode quiescent current | Extends runtime in portable medical devices by >3× versus PWM-only converters under light loads (e.g., sensor sleep states). |
| Programmable UVLO with 100mV hysteresis | Enables precise battery cutoff (e.g., 2.8V Li-ion termination) while preventing oscillation near threshold during discharge. |
| Internal 2.2MHz oscillator + 0.5–4MHz programmability | Supports ultra-compact designs: 0.68μH inductor + 100μF output cap achieves 3.3V@5A with <10mm² solution size. |
| Thermally enhanced 3mm × 3mm LQFN | θJA = 30°C/W (JEDEC), θJC = 6°C/W - enables 6A continuous operation with minimal heatsinking on 2-layer PCB. |
Applications
| Portable Inventory Terminals | Handheld Computers |
|---|---|
|
Use Scenario: Powering barcode scanners, RFID readers, and display backlights from single-cell Li-ion (2.8–4.2V). IC Role / Device Role / Timing Role: Primary system regulator maintaining stable 3.3V/5V rails despite wide VIN swing and pulsed 2A loads. Use Value: Seamless buck-boost operation avoids brownouts during transmit bursts; 17μA IQ extends scan-session battery life by >40%. |
Use Scenario: Supplying SoC core, memory, and touchscreen controller in ruggedized field tablets. IC Role / Device Role / Timing Role: High-current (5A peak) intermediate bus converter delivering 3.3V from variable battery input. Use Value: 97% peak efficiency at 3.6V→3.3V reduces thermal load on sealed enclosure; 2.2MHz switching minimizes audible noise. |
| Wireless RF Transmitter | Medical Instrumentation |
|
Use Scenario: Biasing PA stages and ADCs in portable UWB or BLE modules with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, synchronizable power source enabling coexistence with sensitive RF receivers. Use Value: SYNC/MODE pin allows locking to system clock (e.g., 2.5MHz), eliminating beat frequencies and passing CISPR-22 Class B emissions. |
Use Scenario: Powering precision analog front-ends (ECG, pulse oximetry) and microcontrollers in battery-operated diagnostics. IC Role / Device Role / Timing Role: Ultra-low-noise, high-PSRR regulator supplying critical analog rails with <10μV ripple in Burst Mode. Use Value: Programmable soft-start (via SS pin) prevents inrush-induced voltage droop that could reset MCU or corrupt sensor calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEMSE#PBF | 4-switch buck-boost, 6A, 2.5–40V input, 1.2–40V output; higher VIN range, larger 16-lead MSOP package (4mm × 5mm). | Suitable for automotive (12V/24V battery) or industrial input; not optimized for sub-2V start-up or ultra-compact layouts. | Select LT8390A when input exceeds 5.5V or extended temperature (–40°C to 150°C) is required; avoid for space-constrained portable designs. |
| TPS63020DSJR | 4-switch buck-boost, 4A, 1.8–5.5V input, 1.2–5.5V output; 2.4MHz fixed frequency, 25μA IQ in PFM mode, 10-pin WSON (3mm × 2mm). | Lower max current (4A vs 6A), no RT/SYNC programmability, smaller footprint but higher RDS(ON) (35mΩ typical). | Choose TPS63020 for cost-sensitive, lower-current (<4A) applications where 3mm × 2mm size is critical and 25μA IQ is acceptable. |
Compared with LT3154AV#PBF, LT8390A offers wider input range and higher temp rating but larger size and higher BOM cost; TPS63020 provides smaller footprint and TI ecosystem support but sacrifices 2A current headroom and programmability-making LT3154AV#PBF optimal for 5–6A portable systems demanding flexibility and thermal performance.
Availability
LT3154AV#PBF is available at Aetrix Electronics and suitable for portable inventory terminals, handheld computers, and wireless RF transmitter designs requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for LT3154AV#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3154 belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for high-current, wide-input-range applications in portable and battery-powered systems where size, thermal performance, and light-load efficiency are critical.
FAQ
What is the maximum continuous output current supported by the LT3154AV#PBF?
The LT3154AV#PBF delivers up to 6A continuous output current under proper thermal conditions-achievable using the exposed PGND pad soldered to a 4cm² copper area on a 2-layer PCB with 1oz copper. Derating applies above 85°C ambient; full 6A is specified at TA ≤ 60°C with recommended layout per the demo board (DC2222A).
How does the LT3154AV#PBF handle transitions between buck, buck-boost, and boost modes?
The LT3154AV#PBF uses a proprietary four-switch control algorithm that dynamically adjusts duty cycles of switches A–D to maintain seamless regulation across all three modes. Unlike conventional topologies, it avoids discontinuities in average inductor current and loop transfer function-ensuring stable output voltage and consistent transient response whether VIN is 1.8V, 3.6V, or 5.5V relative to a 3.3V output.
Can the LT3154AV#PBF be synchronized to an external clock, and what are the timing requirements?
Yes, the LT3154AV#PBF supports external clock synchronization via the SYNC/MODE pin. The external clock must exceed the internally programmed fSW (set by RT), with pulse width ≥75ns and period −75ns ≤ thigh ≤ tperiod − 75ns. To ensure reliable acquisition, RT should be configured for 25–50% lower frequency than the minimum sync clock (e.g., RT = 74.9kΩ for 1.5MHz sync target).
What is the purpose of the VC pin on the LT3154AV#PBF, and how is it used in design?
VC is the output of the transconductance error amplifier (110μS) and serves as the control node for the average current mode loop. An RC/CC network from VC to GND provides type-II or type-III compensation to stabilize the converter across all operating modes. Proper VC compensation is essential to prevent oscillation during mode transitions and ensure <1% output deviation under 0–6A load steps.
Is the LT3154AV#PBF RoHS compliant, and what is its moisture sensitivity level (MSL)?
Yes, the LT3154AV#PBF is RoHS and WEEE compliant (Pb-free, halogen-free). It is packaged in an LQFN with MSL rating Level 3 per JEDEC J-STD-020, meaning floor life is 168 hours at ≤30°C/60% RH. Bake condition before reflow is 24 hours at 125°C if exposed beyond floor life.
LT3154AV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 5A
- Frequency - Switching:
- 400kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LQFN (3x3)
LT3154AV#PBF FAQ
1.How can I place an order for LT3154AV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3154AV#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 LT3154AV#PBF reliable?
The price and inventory of LT3154AV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3154AV#PBF is usually 5 days.
3.What payment methods are accepted for LT3154AV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3154AV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3154AV#PBF?
LT3154AV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3154AV#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 LT3154AV#PBF?
For technical support, including LT3154AV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3154AV#PBF requirements.
6.How does Aetrix verify that LT3154AV#PBF is sourced from the original manufacturer or authorized distributors?
All LT3154AV#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 LT3154AV#PBF meets industry standards.
7.What is the process for return or replacement of LT3154AV#PBF?
All LT3154AV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3154AV#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 LT3154AV#PBF part is unused and in its original packaging.
Return procedure for LT3154AV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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