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Analog Devices Inc. LTC3442EDE#PBF
- Part No.:
- LTC3442EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3442EDE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
LTC3442EDE#PBF from Analog Devices (formerly Linear Technology) is a micropower synchronous buck-boost DC/DC converter with automatic Burst Mode® operation, designed for single-cell Li-ion or multi-cell alkaline battery systems where input voltage crosses the output voltage. It delivers up to 1.2A continuous output current, achieves up to 95% efficiency, and operates across 2.4V–5.5V input and 2.4V–5.25V output ranges - ideal for handheld instrumentation and USB-powered peripherals.
For engineers reviewing the LTC3442EDE#PBF datasheet, LTC3442EDE#PBF pinout, LTC3442EDE#PBF application, or LTC3442EDE#PBF equivalent, key selection criteria include programmable average input current limit (via RLIM), 35µA quiescent current in Burst Mode, 300kHz–2MHz frequency programming (RT pin), 0.10Ω NMOS/PNOS switch RDS(ON), and seamless buck/buck-boost/boost mode transition without output discontinuity.
Technical Context
The LTC3442EDE#PBF implements a four-switch synchronous topology with internal 0.10Ω N-channel and P-channel MOSFETs, enabling continuous conduction across VIN > VOUT (buck), VIN ≈ VOUT (four-switch buck-boost), and VIN < VOUT (boost) regions. Its voltage-mode error amplifier (1.22V reference, 90dB AVOL) drives VC to control duty cycle, while internal peak current limiting (5A typical) and reverse current limiting (500mA typical) provide robust protection.
Automatic Burst Mode® is triggered by load-dependent threshold programming via external RBURST/ CBURST, reducing quiescent current to 35µA at light loads. The device supports manual mode forcing (BURST grounded or tied to VOUT), disables programmable current limiting during Burst Mode, and incorporates active VC clamping to minimize output transients when exiting Burst Mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports full discharge of single Li-ion (2.7V–4.2V) and multi-cell alkaline (3×1.5V = 4.5V nominal, down to ~2.4V). |
| Output Voltage Range | 2.4V to 5.25V - adjustable via FB resistor divider; 1.22V feedback reference enables precise regulation across wide range. |
| Max Continuous Output Current | 1.2A - sustained delivery from single Li-ion cell (VIN ≥ 2.5V) with proper thermal layout on 4-layer PCB (θJA = 43°C/W). |
| Quiescent Current (Burst Mode) | 35µA - extends battery runtime in standby or low-duty-cycle portable applications (e.g., PDA sleep mode). |
| Switching Frequency Range | 300kHz to 2MHz - programmed via RT-to-GND resistor; higher frequencies enable smaller inductors (e.g., 4.7µH at 600kHz) and reduced EMI filtering area. |
| Internal Switch RDS(ON) | 0.10Ω (NMOS & PMOS) - minimizes conduction loss; enables high efficiency (>90%) even at 1A load with low thermal rise. |
| Shutdown Current | <1µA - ensures negligible battery drain during system off-state; SHDN/SS pin doubles as soft-start control. |
Pinout & Package
The LTC3442EDE#PBF is housed in a thermally enhanced 12-lead (4mm × 3mm × 0.75mm) DFN package with exposed PGND pad (Pin 13) requiring solder connection to PCB ground for electrical integrity and thermal dissipation (θJC = 4.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/SS (1) | Combined shutdown and soft-start control | Voltage <0.4V disables IC; >1.4V enables; >2.4V ensures full error amp operation; RC network provides controlled VC ramp for inrush current limiting. |
| RT (2) | Oscillator frequency programming | Resistor to GND sets switching frequency per f(kHz) = 43,300 / RRT(kΩ); enables optimization of size vs. efficiency vs. EMI. |
| SGND (3) | Signal ground reference | Separate from PGND to avoid noise coupling into feedback and error amp circuits; must be routed with low-impedance path to PGND at single point. |
| SW1 (4) | Inductor connection node (switches A & B) | Connects to one end of power inductor; optional Schottky diode to GND improves light-load efficiency by ~1–2%. |
| PGND (5,13) | Power ground for NMOS switches | Pins 5 and 13 (exposed pad) must be soldered to large copper pour; critical for thermal management and minimizing ground bounce during high di/dt switching. |
| SW2 (6) | Inductor connection node (switches C & D) | Connects to other end of power inductor; optional Schottky diode to VOUT reduces voltage drop during break-before-make timing. |
| BURST (7) | Automatic Burst Mode threshold control | RC network to GND programs load-current thresholds for Burst Mode entry/exit; grounding forces Burst Mode, tying to VOUT forces fixed-frequency operation. |
| VOUT (8) | Regulated output terminal | Delivers regulated voltage; requires local ceramic bypass (0.01µF) and bulk capacitor (≥22µF) to suppress ripple and support transient response. |
| VIN (9) | Main input supply and internal VCC source | Accepts 2.4–5.5V; requires 10µF ceramic capacitor near pin to stabilize internal bias and reduce input ripple. |
| RLIM (10) | Average input current limit programming | RC network to GND sets maximum average input current (e.g., 500mA for USB compliance); disabled during Burst Mode. |
| VC (11) | Error amplifier output | Drives PWM logic; compensation network (RC + C) connects between VC and FB to stabilize loop; actively clamped during Burst Mode to prevent output transients. |
| FB (12) | Feedback voltage sensing | Monitors resistor divider output; 1.22V reference enables precise output adjustment; input current ≤50nA minimizes divider error. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables seamless regulation across input voltages above, below, or equal to output - eliminates need for separate buck/boost ICs in battery-powered systems. |
| Programmable average input current limit | Allows precise USB 500mA compliance or custom current capping via RLIM resistor; independent of VIN variation. |
| Automatic Burst Mode® with user-defined threshold | Reduces quiescent current to 35µA at light loads while maintaining regulation; transition current set by single RBURST resistor (e.g., 100kΩ → 176mA entry). |
| Integrated 0.10Ω MOSFETs (NMOS & PMOS) | Eliminates external power switches and Schottky diodes; reduces BOM count, board space, and conduction losses - simplifies design for compact portable devices. |
| Active VC clamping during Burst Mode | Prevents output voltage overshoot/undershoot when returning to fixed-frequency operation; removes need for complex compensation re-tuning across modes. |
| Thermally enhanced 12-lead DFN (4mm × 3mm) | Exposes PGND pad for direct PCB thermal coupling; achieves θJA = 43°C/W on 4-layer board - enables 1.2A operation without heatsink in space-constrained layouts. |
Applications
| PDA / Smartphones | Handheld Instruments |
|---|---|
Use Scenario: Powering core logic and display from single Li-ion battery with voltage sagging from 4.2V to 2.7V during discharge. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining stable 3.3V rail regardless of battery state; handles mode transitions transparently during load changes. Use Value: Eliminates need for battery gauge-based rail switching; sustains full functionality across entire battery life without brownouts. |
Use Scenario: Supplying precision analog front-end (ADC, op-amps) and microcontroller in portable multimeter or data logger. IC Role / Device Role / Timing Role: Low-noise, high-efficiency power source with <1µA shutdown current; Burst Mode extends battery life during measurement intervals. Use Value: Enables >100-hour battery life on AA cells; 35µA quiescent current preserves charge during idle periods between readings. |
| USB Peripherals | Digital Cameras |
Use Scenario: Regulating 5V USB bus down to 3.3V or 2.8V for embedded controller and sensors in USB audio interface or HID device. IC Role / Device Role / Timing Role: Input current-limited buck-boost converter enforcing 500mA USB spec via RLIM pin; supports hot-plug detection and enumeration. Use Value: Ensures USB compliance without external current-sense circuitry; prevents host port overcurrent shutdown during startup surges. |
Use Scenario: Powering image sensor, ISP, and flash LED from dual AA/AAA alkaline cells (3V nominal, down to 2.4V under load). IC Role / Device Role / Timing Role: Wide-input buck-boost delivering 2.8V/3.3V rails; handles rapid load transients during autofocus and image capture bursts. Use Value: Maintains stable sensor bias during high-current LED flash; avoids frame corruption caused by rail droop in conventional LDO solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Higher 2A output capability; fixed 3.3V/5V options; no programmable input current limit; 2.5µA quiescent current in deep sleep (vs. 35µA Burst Mode). | Better suited for higher-current applications (e.g., tablets); lacks RLIM-based USB current enforcement. | Select if >1.2A output or ultra-low deep-sleep current is required; verify thermal performance at 2A in same DFN footprint. |
| MAX77827AEWE+T | Integrated battery charger + buck-boost; 3A output; I2C programmable; 25µA quiescent current; requires external MOSFETs for >1.5A. | Targeted at battery-backed systems needing charging + regulation; adds complexity for standalone regulation-only use cases. | Choose when combining charging and power path management is needed; avoid if only regulation is required due to added firmware overhead. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3442EDE#PBF offers unique programmable input current limiting for USB compliance, deterministic Burst Mode threshold setting, and proven 1.2A capability in a compact DFN - making it optimal for cost-sensitive, battery-life-critical portable designs without charging requirements.
Availability
LTC3442EDE#PBF is available at Aetrix Electronics and suitable for handheld instrumentation, USB peripherals, and digital camera power management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.
Supply support for LTC3442EDE#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 its legacy of high-performance analog and power management ICs with rigorous characterization and long-term product support.
The LTC3442EDE#PBF belongs to Linear's micropower DC/DC converter family, engineered specifically for battery-powered portable electronics demanding high efficiency across wide input/output voltage ranges and ultra-low quiescent current in standby.
FAQ
What is the minimum input voltage required to start up the LTC3442EDE#PBF?
The LTC3442EDE#PBF has a guaranteed minimum input start-up voltage of 2.3V, with typical operation beginning at 2.4V. This allows reliable turn-on from deeply discharged single Li-ion cells (down to ~2.5V) and three-cell alkaline batteries under load, ensuring system functionality across full battery discharge cycles without requiring auxiliary start-up circuitry.
How does the LTC3442EDE#PBF achieve seamless voltage transition when VIN crosses VOUT?
The LTC3442EDE#PBF uses an internal four-switch synchronous topology that dynamically phases NMOS and PMOS pairs (A/B/C/D) based on the error amplifier output (VC). As VIN approaches VOUT, it enters a continuous buck-boost region with ~150ns four-switch conduction time - eliminating output discontinuity, mode-hopping artifacts, or regulation loss during battery voltage sag or surge events.
Can the LTC3442EDE#PBF be used without external Schottky diodes?
Yes, the LTC3442EDE#PBF is designed for true synchronous operation without external Schottky diodes. Its integrated 0.10Ω NMOS and PMOS switches provide low-loss rectification. Optional Schottky diodes across SW1–GND or SW2–VOUT improve peak efficiency by ~1–2% but are not required for basic operation or stability - simplifying BOM and layout for cost-sensitive designs.
What is the purpose of the exposed pad (Pin 13) on the LTC3442EDE#PBF DFN package?
The exposed pad (Pin 13) on the LTC3442EDE#PBF is electrically and thermally connected to PGND. It must be soldered to a large PCB copper pour to achieve specified thermal performance (θJA = 43°C/W on 4-layer board) and ensure low-impedance return path for high di/dt switch currents - failure to connect it degrades efficiency, increases junction temperature, and risks thermal shutdown under 1.2A load.
How is the Burst Mode® threshold programmed on the LTC3442EDE#PBF?
The Burst Mode® entry and exit thresholds on the LTC3442EDE#PBF are set by a single resistor (RBURST) from the BURST pin to GND: Enter Burst Mode at ILOAD = 17.6 / RBURST(kΩ) amps; Exit at ILOAD = 22.4 / RBURST(kΩ) amps. A parallel capacitor (CBURST ≥ COUT × VOUT / 60,000) prevents false triggering from noise - e.g., 100kΩ + 100pF supports ~176mA threshold with 22µF output cap.
LTC3442EDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3442EDE#PBF FAQ
1.How can I place an order for LTC3442EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3442EDE#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 LTC3442EDE#PBF reliable?
The price and inventory of LTC3442EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3442EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3442EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3442EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3442EDE#PBF?
LTC3442EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3442EDE#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 LTC3442EDE#PBF?
For technical support, including LTC3442EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3442EDE#PBF requirements.
6.How does Aetrix verify that LTC3442EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3442EDE#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 LTC3442EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3442EDE#PBF?
All LTC3442EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3442EDE#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 LTC3442EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3442EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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