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Analog Devices Inc. LTC3442EDE#TRPBF
- Part No.:
- LTC3442EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3442EDE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,776
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Product details
Overview
LTC3442EDE#TRPBF 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 regulated output. It delivers up to 1.2A continuous output current, supports 2.4V–5.25V adjustable output, operates from 2.4V–5.5V input, and achieves up to 95% efficiency with 35µA quiescent current in Burst Mode - ideal for PDA, digital cameras, and USB peripherals.
For engineers reviewing the LTC3442EDE#TRPBF datasheet, LTC3442EDE#TRPBF pinout, LTC3442EDE#TRPBF application, or LTC3442EDE#TRPBF equivalent, key selection criteria include programmable average input current limit (via RLIM), manual/automatic Burst Mode control (BURST pin), fixed-frequency or discontinuous conduction mode operation, and compatibility with single-inductor, no-Schottky-diode topologies in space-constrained portable designs.
Technical Context
The LTC3442EDE#TRPBF implements a four-switch buck-boost topology with integrated 0.10Ω NMOS and 0.10Ω PMOS power switches, enabling seamless transition between buck, buck-boost, and boost modes as VIN varies relative to VOUT. Its voltage-mode error amplifier (1.22V reference, 90dB AVOL) drives a PWM logic block with anti-cross-conduction protection and thermal shutdown.
Operation includes three independent current-limit circuits: fixed 5A peak switch-A limit, closed-loop 3A input current clamp via FB pin, and externally programmable average input current limit (0.95V threshold on RLIM). Burst Mode® is controlled by an internal VC hold circuit and BURST pin RC network, with entry/exit thresholds set by RBURST (e.g., 17.6kΩ → 1A entry).
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 2–3 alkaline cells without dropout. |
| Output Voltage Range | 2.4V to 5.25V - adjustable via resistor divider on FB pin; 1.22V feedback reference enables precise regulation. |
| Continuous Output Current | Up to 1.2A - achievable from single Li-ion cell (VIN ≥ 2.5V) with proper thermal layout on 4-layer PCB. |
| Quiescent Current (Burst Mode) | 35µA typical - extends battery runtime in standby; drops to <1µA in shutdown. |
| Switching Frequency | Programmable 300kHz–2MHz via RT resistor - higher frequencies allow smaller inductors (e.g., 4.7µH at 600kHz). |
| Efficiency | Up to 95% - achieved in fixed-frequency mode; Burst Mode maintains >82% efficiency down to ~100µA load. |
| Current Limit Options | Three independent limits: 5A peak (SW A), 3A closed-loop (FB clamp), and programmable average (RLIM pin, 0.95V threshold). |
Pinout & Package
The LTC3442EDE#TRPBF 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 thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN/SS (1) | Combined shutdown and soft-start control | Logic-level enable: <0.4V = shutdown; >2.4V = full enable with unclamped VC; RC network provides controlled ramp. |
| RT (2) | Oscillator frequency programming | Resistor-to-ground sets switching frequency per f(kHz) = 43,300 / RT(kΩ); determines inductor size and EMI profile. |
| SGND (3) | Signal ground reference | Separate from PGND to minimize noise coupling into feedback and error amp circuitry. |
| SW1 (4) | Internal switch node A/B junction | Connects to one end of power inductor; optional Schottky to GND improves light-load efficiency by ~1%. |
| PGND (5,13) | Power ground for NMOS switches | Pins 5 and 13 (exposed pad) must be solidly soldered to PCB ground plane for thermal dissipation (θJC = 4.3°C/W). |
| SW2 (6) | Internal switch node C/D junction | Connects to other end of power inductor; optional Schottky to VOUT reduces conduction loss in boost mode. |
| BURST (7) | Automatic Burst Mode threshold control | RC network to ground programs load-current threshold for Burst Mode entry/exit; grounding forces Burst Mode. |
| VOUT (8) | Regulated output terminal | Delivers stable output; requires low-ESR ceramic capacitor (≥10µF) placed adjacent to pin for ripple suppression. |
| VIN (9) | Main input supply and internal VCC source | Accepts 2.4–5.5V; requires local 10µF ceramic bypass to SGND to stabilize internal bias rails. |
| RLIM (10) | Average input current limit programming | RC network to ground sets maximum average input current (e.g., 500mA for USB compliance); disabled in Burst Mode. |
| VC (11) | Error amplifier output | Drives PWM comparators; compensation network (FB–VC) stabilizes loop; held at optimal voltage during Burst Mode. |
| FB (12) | Feedback voltage sensing | Monitors resistor divider output; 1.22V reference enables output adjustment; clamped during overcurrent events. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous buck-boost topology | Enables continuous regulation across VIN > VOUT, VIN ≈ VOUT, and VIN < VOUT without mode-hopping artifacts or output glitches. |
| Programmable average input current limit | Allows precise USB 500mA compliance or battery charge-rate limiting using external RLIM resistor and capacitor. |
| 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. |
| Integrated 0.10Ω MOSFETs (NMOS + PMOS) | Eliminates external power switches and Schottky diodes in most applications, reducing BOM count and board area. |
| Active VC hold during Burst Mode | Prevents output transients when returning to fixed-frequency operation by maintaining optimal error amp output voltage. |
Applications
| PDA / Smartphones | Handheld Instruments |
|---|---|
Use Scenario: Power management in compact handheld devices with single Li-ion battery (2.7–4.2V) supplying 3.3V to processor and peripherals. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 3.3V output while tracking battery voltage across full discharge cycle. Use Value: Eliminates need for separate buck and boost converters; 95% peak efficiency and 35µA Burst Mode current extend usable battery life by >30% vs. linear regulators. | Use Scenario: Precision analog front-end and microcontroller supply in battery-powered test equipment with variable load profiles. IC Role / Device Role / Timing Role: Main system power rail generator with low-noise fixed-frequency operation and programmable input current limiting for USB-powered calibration. Use Value: Programmable RLIM ensures compliance with host USB port current limits; soft-start prevents inrush-induced sensor offset errors during power-up. |
| Digital Cameras | USB Peripherals |
Use Scenario: Powering image sensor, flash LED driver, and memory interface from two alkaline cells (1.8–3.2V) targeting 2.8V or 3.3V system rail. IC Role / Device Role / Timing Role: Single-inductor buck-boost converter supporting wide input range without diode losses or mode transitions. Use Value: Up to 1.2A output current sustains burst-mode sensor capture; no external Schottky diodes reduce cost and footprint by 25% vs. traditional solutions. | Use Scenario: Bus-powered USB audio interface or HID device requiring stable 3.3V/5V rail from USB 5V source with strict 500mA input cap. IC Role / Device Role / Timing Role: Input-current-limited buck-boost regulator converting USB 5V to 3.3V while enforcing 500mA average draw via RLIM pin. Use Value: RLIM-based current limiting prevents USB enumeration failure; Burst Mode maintains <100µA idle current for plug-and-play readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Higher 2A output current, 2.5V–5.5V input, fixed 3.3V/5V options; no programmable RLIM or BURST pin; uses different compensation scheme. | Best for higher-current, fixed-output applications where programmability is secondary to peak output capability. | Select TPS63020DSJR when >1.2A load or simplified fixed-VOUT design is required; avoid if RLIM-based USB current limiting or Burst Mode threshold tuning is needed. |
| MAX77827BEWC+T | Supports 2.5V–5.5V input, 0.6V–5.2V output, 2A max; includes I²C interface for dynamic voltage scaling; no discrete BURST/RLIM pins. | Suitable for systems requiring real-time output voltage adjustment or telemetry, not standalone analog-programmed converters. | Choose MAX77827BEWC+T for smart power management with host MCU coordination; LTC3442EDE#TRPBF remains preferred for pin-controlled simplicity and minimal external components. |
Compared with TPS63020DSJR and MAX77827BEWC+T, the LTC3442EDE#TRPBF offers unique analog programmability of Burst Mode threshold and average input current limit via dedicated pins - critical for USB-compliant and battery-life-optimized portable designs where I²C overhead or fixed-output constraints are unacceptable.
Availability
LTC3442EDE#TRPBF is available at Aetrix Electronics and suitable for PDA/smartphone power rails, handheld instrumentation supplies, digital camera main rails, USB peripheral regulation, and battery-powered industrial sensors requiring stable component supply with long-term lifecycle support.
Supply support for LTC3442EDE#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 IC portfolio, emphasizing precision, efficiency, and reliability in power management, signal conditioning, and timing solutions.
The LTC3442EDE#TRPBF belongs to Linear's micropower DC/DC converter product line, engineered specifically for battery-operated portable electronics demanding wide-input-range regulation, ultra-low quiescent current, and minimal external component count.
FAQ
What is the minimum input voltage required for the LTC3442EDE#TRPBF to start regulation?
The LTC3442EDE#TRPBF has a guaranteed input start-up voltage of 2.4V (typical 2.3V), allowing reliable operation down to the end-of-discharge voltage of a single Li-ion cell. Below this threshold, the UVLO circuit disables switching; startup occurs only when VIN exceeds 2.4V with sufficient slew rate to avoid false triggering. This ensures stable boot-up even under cold-temperature battery conditions.
How does the RLIM pin function in the LTC3442EDE#TRPBF, and what happens when it's left unconnected?
The RLIM pin on the LTC3442EDE#TRPBF sets the average input current limit via an external resistor-capacitor network; the internal comparator triggers when the mirrored input current produces 0.95V across RLIM. If left unconnected, the programmable current limit is disabled, and only the fixed 3A/5A internal limits remain active. This may cause overcurrent stress on USB ports or batteries unless external current limiting is implemented.
Can the LTC3442EDE#TRPBF operate without an external inductor, and what is the recommended inductor value for 3.3V output from a 3.6V nominal Li-ion input?
No, the LTC3442EDE#TRPBF requires an external power inductor - it is not an inductorless charge-pump device. For 3.3V output from 3.6V nominal input at 600kHz, a 4.7µH shielded ferrite inductor rated for ≥1.5A saturation current is recommended. Inductor selection follows LBUCK > VOUT(VIN(MAX)−VOUT)/(f·ΔIL·VIN(MAX)); typical ΔIL is 30% of max load, yielding ~4.7µH for 1.2A output.
What is the purpose of the exposed pad (Pin 13) on the LTC3442EDE#TRPBF DFN package, and how must it be handled in PCB layout?
The exposed pad (Pin 13) on the LTC3442EDE#TRPBF is electrically and thermally connected to PGND. It must be soldered to a dedicated PCB ground plane using ≥4 thermal vias (0.3mm diameter) to achieve θJC = 4.3°C/W. Failure to connect it results in excessive junction temperature (>125°C), triggering thermal shutdown and potential reliability degradation during 1.2A continuous operation.
Does the LTC3442EDE#TRPBF support output disconnect in shutdown mode, and how is this achieved?
Yes, the LTC3442EDE#TRPBF provides true output disconnect in shutdown mode. When SHDN/SS is pulled below 0.4V, internal PMOS switch D is turned off and NMOS switch C is held non-conductive, breaking the path from VOUT to PGND and preventing reverse current flow. This eliminates battery drain through load circuitry during system sleep - critical for always-on sensors and backup power systems.
LTC3442EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3442EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3442EDE#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 LTC3442EDE#TRPBF reliable?
The price and inventory of LTC3442EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3442EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3442EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3442EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3442EDE#TRPBF?
LTC3442EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3442EDE#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 LTC3442EDE#TRPBF?
For technical support, including LTC3442EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3442EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3442EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3442EDE#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 LTC3442EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3442EDE#TRPBF?
All LTC3442EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3442EDE#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 LTC3442EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3442EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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