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Analog Devices Inc. LTC3443EDE#PBF
- Part No.:
- LTC3443EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3443EDE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.2A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:329
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Product details
Overview
LTC3443EDE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, fixed-frequency synchronous buck-boost DC/DC converter capable of regulated output with input voltage above, below, or equal to the output (2.4V–5.25V output range, 2.4V–5.5V input range). It delivers up to 1.2A continuous output current from a single Li-ion cell, features 600kHz fixed switching frequency with synchronizable oscillator, and achieves up to 96% efficiency in buck-boost mode-ideal for portable power rails in handheld instrumentation and digital cameras.
For engineers reviewing the LTC3443EDE#PBF datasheet, LTC3443EDE#PBF pinout, LTC3443EDE#PBF application, or LTC3443EDE#PBF equivalent, key selection criteria include its true output disconnect in shutdown (<1μA quiescent current), burst mode operation (28μA IQ), thermally enhanced 12-lead DFN package (4mm × 3mm), and integrated 0.10Ω NMOS / 0.11Ω PMOS switches enabling single-inductor, no-Schottky operation.
Technical Context
The LTC3443EDE#PBF implements a proprietary four-switch buck-boost topology with continuous transfer function across all operating modes (buck, buck-boost, boost), eliminating mode transitions and ensuring seamless regulation as input voltage crosses the output setpoint. Its voltage-mode PWM control loop uses an error amplifier with 1.22V reference and VC pin for loop compensation, supporting both burst mode (variable frequency, low IQ) and fixed-frequency (600kHz, low noise) operation via MODE/SYNC pin control.
Internal protection includes thermal shutdown, reverse current limit (–400mA typical), average current limit (3.2A typical), and overvoltage clamping on VC during burst mode. The IC integrates dual N-channel (SW1/SW2) and dual P-channel switches with verified RDS(ON) values (0.10Ω NMOS, 0.11Ω PMOS), and supports optional external Schottky diodes for marginal efficiency gain (≤2%) when VOUT > 4.3V or for break-before-make optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.4V to 5.5V - supports full Li-ion battery discharge curve (2.8V–4.2V) without dropout or mode switching artifacts. |
| Output Voltage Range | 2.4V to 5.25V - adjustable via FB resistor divider; 1.22V feedback reference enables precise regulation. |
| Switching Frequency | 600kHz fixed, synchronizable up to 1.2MHz - balances efficiency, size, and EMI; avoids audible noise and enables compact 6μH inductor. |
| Quiescent Current | 28μA in Burst Mode - maximizes battery runtime in standby or light-load portable applications. |
| Shutdown Current | <1μA - ensures zero-load battery drain during system sleep or off-state. |
| Continuous Output Current | 1.2A - verified at VIN = 3.6V, VOUT = 3.3V, TA = 25°C with proper PCB thermal design (θJA = 43°C/W, 4-layer). |
| Efficiency Peak | 96% - achieved in buck-boost region at 1A load, enabling minimal thermal rise in space-constrained DFN package. |
Pinout & Package
Package: 12-lead (4mm × 3mm × 0.8mm) thermally enhanced plastic DFN with exposed PGND pad (Pin 13) requiring solder connection to PCB ground plane for optimal thermal performance (θJC = 4.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 12) | Feedback Input | Connects to resistor divider tap; senses output voltage against 1.22V internal reference for regulation. |
| VC (Pin 11) | Error Amplifier Output | Provides compensated control voltage to PWM logic; requires external RC network to FB for loop stability. |
| VIN (Pin 10) | IC Supply Input | Powers internal circuitry; requires ≥4.7μF low-ESR ceramic bypass capacitor near pin. |
| PVIN (Pin 9) | Power Input for Switches | High-current path for NMOS switch supply; requires 10μF ceramic cap to PGND for low-impedance return. |
| VOUT (Pin 8) | Regulated Output | Delivers regulated DC output; requires bulk + ceramic capacitors (e.g., 44μF + 22μF) close to pin for ripple suppression. |
| MODE/SYNC (Pin 7) | Operation Mode Control | High = Burst Mode (28μA IQ); Low = Fixed Frequency (600kHz); External clock = synchronization (1.38–2.4MHz). |
| SHDN/SS (Pin 1) | Shutdown & Soft-Start | <0.4V = shutdown (<1μA); >1.4V = enable; RC network enables controlled soft-start by limiting VC ramp rate. |
| GND (Pin 2) | Signal Ground | Reference for analog circuitry (error amp, comparators); must be separated from PGND except at single point. |
| PGND (Pins 3, 6, 13) | Power Ground | Return path for NMOS switches and PVIN; exposed pad (Pin 13) must be soldered to PCB ground plane for thermal conduction. |
| SW1 (Pin 4) | Switch Node A/B | Connects internal NMOS B and PMOS A; ties to one end of inductor; optional Schottky to GND improves light-load efficiency. |
| SW2 (Pin 5) | Switch Node C/D | Connects internal NMOS C and PMOS D; ties to other end of inductor; Schottky to VOUT required if VOUT > 4.3V. |
Key Features
| Feature | Design Value |
|---|---|
| True Output Disconnect | Enables complete isolation of VOUT from input during shutdown, preventing backfeed and enabling safe hot-swap or rail sequencing. |
| Single-Inductor Architecture | Eliminates need for Schottky diodes in most configurations, reducing BOM count, board area, and forward-voltage losses. |
| Thermally Enhanced DFN | 4mm × 3mm footprint with exposed PGND pad achieves θJA = 43°C/W on 4-layer board, supporting 1.2A continuous output without heatsink. |
| Four-Switch Continuous Transfer | Seamlessly transitions between buck, buck-boost, and boost regions without discontinuities or regulation glitches as VIN crosses VOUT. |
| User-Selectable Operating Mode | Burst Mode (low IQ) or fixed-frequency (low noise) selected via single MODE/SYNC pin-no external components needed. |
Applications
| Handheld Instruments | Digital Cameras |
|---|---|
Use Scenario: Portable multimeters, oscilloscopes, and data loggers powered by single Li-ion cells requiring stable 3.3V rail across full battery discharge (2.8V–4.2V). IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 3.3V output with continuous operation as battery voltage drops below 3.3V. Use Value: Eliminates need for separate buck and boost converters; maintains regulation without brownouts during battery sag, extending usable runtime. | Use Scenario: Image sensor and processor power in compact digital cameras where space and thermal budget are constrained. IC Role / Device Role / Timing Role: High-efficiency 3.3V/5V power rail generator with fast transient response to handle burst-mode image capture loads. Use Value: 96% peak efficiency minimizes heat generation in sealed enclosures; 600kHz switching enables small 6μH inductor and low-profile ceramic caps. |
| MP3 Players | Handheld Computers |
Use Scenario: Audio codec and flash memory power in battery-operated MP3 players with aggressive standby current targets. IC Role / Device Role / Timing Role: Main system regulator operating in Burst Mode during audio decode idle periods to minimize quiescent draw. Use Value: 28μA Burst Mode IQ extends playback time; true output disconnect prevents battery drain through peripheral circuits during deep sleep. | Use Scenario: Power management for ARM-based handheld PCs with variable load profiles (idle, UI rendering, video playback). IC Role / Device Role / Timing Role: Adaptive buck-boost controller supplying core voltage while dynamically adjusting mode based on load and battery state. Use Value: Synchronizable oscillator allows noise-sensitive subsystems (e.g., touch controller, RF) to avoid switching frequency interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3441EDE#PBF | Pin-compatible predecessor; operates at 1MHz (vs. 600kHz), lacks VC clamp in Burst Mode, higher quiescent current (35μA vs. 28μA). | Less suitable for noise-sensitive applications due to higher switching frequency; lower light-load efficiency. | Select LTC3443EDE#PBF when lower EMI, improved light-load efficiency, or tighter thermal control is required. |
| LT8330EDD#PBF | Fixed-frequency (2MHz) buck-boost with integrated 1.5A switch; wider input (2.8V–40V), but larger 10-lead DFN (3mm × 3mm) and no Burst Mode. | Designed for industrial/high-VIN applications; lacks ultra-low-IQ capability for battery longevity. | Choose LT8330EDD#PBF only for systems requiring >5.5V input or higher output current; not drop-in for portable Li-ion designs. |
Compared with LTC3441EDE#PBF, the LTC3443EDE#PBF offers lower switching frequency (reducing EMI and inductor size trade-offs) and superior light-load efficiency, while LT8330EDD#PBF trades IQ and thermal density for higher input voltage range and current capability-making LTC3443EDE#PBF optimal for compact, battery-critical portable systems.
Availability
LTC3443EDE#PBF is available at Aetrix Electronics and suitable for handheld instruments, digital cameras, MP3 players, and handheld computers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3443EDE#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC3443EDE#PBF.
The LTC3443EDE#PBF belongs to Linear's micropower DC/DC converter family, designed specifically for high-efficiency, low-noise power conversion in space- and battery-constrained portable electronics.
FAQ
What is the maximum continuous output current supported by the LTC3443EDE#PBF?
The LTC3443EDE#PBF supports up to 1.2A continuous output current under typical conditions (VIN = 3.6V, VOUT = 3.3V, TA = 25°C) with proper PCB thermal design-specifically a 4-layer board with the exposed PGND pad soldered to a large copper pour (θJA = 43°C/W). Derating is required at elevated ambient temperatures or with reduced copper area.
Does the LTC3443EDE#PBF require external Schottky diodes for basic operation?
No, the LTC3443EDE#PBF does not require external Schottky diodes for basic operation-it integrates synchronous NMOS and PMOS switches enabling single-inductor buck-boost functionality. Schottky diodes are optional and recommended only to improve peak efficiency by ~1–2% in specific cases: when VOUT > 4.3V (required from SW2 to VOUT) or to reduce voltage drop during break-before-make transitions.
How does Burst Mode operation affect the output voltage ripple of the LTC3443EDE#PBF?
Burst Mode operation introduces variable-frequency ripple on the LTC3443EDE#PBF output, with amplitude and frequency dependent on load current. At light loads (e.g., <100mA), ripple increases due to intermittent energy delivery cycles, but remains within specification (typically <20mVPP at 1A). The 28μA quiescent current significantly extends battery life, making this trade-off intentional for portable applications.
Can the LTC3443EDE#PBF regulate output voltage below 2.4V?
Yes, the LTC3443EDE#PBF can regulate output voltages as low as 0.4V in buck mode, though it is specified down to 2.4V minimum to guarantee operation without mandatory external Schottky diodes. Below 2.4V, synchronous switch D's RDS(ON) increases, requiring a Schottky diode from SW2 to VOUT to maintain conduction path and efficiency.
What is the purpose of the exposed pad (Pin 13) on the LTC3443EDE#PBF DFN package?
The exposed pad (Pin 13) on the LTC3443EDE#PBF is electrically connected to PGND and serves as the primary thermal conduction path. It must be soldered to a PCB ground plane with multiple thermal vias to achieve the specified θJC = 4.3°C/W and prevent junction temperature exceedance under 1.2A load-failure to do so risks thermal shutdown or reduced reliability.
LTC3443EDE#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:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3443EDE#PBF FAQ
1.How can I place an order for LTC3443EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3443EDE#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 LTC3443EDE#PBF reliable?
The price and inventory of LTC3443EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3443EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3443EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3443EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3443EDE#PBF?
LTC3443EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3443EDE#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 LTC3443EDE#PBF?
For technical support, including LTC3443EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3443EDE#PBF requirements.
6.How does Aetrix verify that LTC3443EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3443EDE#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 LTC3443EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3443EDE#PBF?
All LTC3443EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3443EDE#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 LTC3443EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3443EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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