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Analog Devices Inc. LTC3422EDD#PBF
- Part No.:
- LTC3422EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3422EDD#PBF.pdf
- Description:
- IC REG BOOST ADJ 1.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,329
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Product details
Overview
LTC3422EDD#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode, synchronous step-up DC/DC converter with true output disconnect, 700mA continuous / 1A pulsed output current, 0.5V–4.5V input range, and 2.25V–5.25V adjustable output voltage-designed for Li-ion to 5V power conversion in space-constrained portable electronics.
For engineers reviewing the LTC3422EDD#PBF datasheet, LTC3422EDD#PBF pinout, LTC3422EDD#PBF application, or LTC3422EDD#PBF equivalent, key selection criteria include guaranteed 1V start-up capability, programmable Burst Mode threshold, 3MHz maximum switching frequency, anti-ringing control, and thermal shutdown with junction temperature monitoring.
Technical Context
The LTC3422EDD#PBF employs fixed-frequency current-mode PWM control with adaptive slope compensation, enabling stable operation across wide input/output ratios. Its integrated 0.20Ω N-channel switch and 0.24Ω P-channel synchronous rectifier support up to 96% efficiency and true output disconnect by eliminating body diode conduction.
Startup is managed by an independent low-voltage oscillator that operates down to 0.88V typical, while soft-start ramping and inrush limiting prevent input surge. The device transitions autonomously between Burst Mode (25µA quiescent current) and fixed-frequency PWM based on load, with mode control programmable via external resistor on BURST pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 4.5V - supports single-cell Li-ion (2.7–4.2V), NiMH, or partially discharged alkaline sources without dropout |
| Output Voltage Range | 2.25V to 5.25V - adjustable via resistive divider; enables direct 3.3V or 5V rail generation from low-VIN sources |
| Continuous Output Current | 700mA - sustained delivery at full efficiency with thermal derating; sufficient for RF front-ends and display drivers |
| Peak Switch Current Limit | 1.5A steady-state - ensures robust transient response and short-circuit protection under pulsed loads |
| Quiescent Current (Burst) | 25µA - extends battery runtime in standby or low-duty-cycle sensor wake-up modes |
| Switching Frequency | Up to 3MHz - allows use of sub-µH inductors and compact ceramic capacitors for ultra-thin handheld layouts |
| Start-Up Input Voltage | 0.88V typical - enables operation from deeply discharged cells or energy-harvesting sources before regulation |
Pinout & Package
Package: 10-pin (3mm × 3mm × 0.75mm) thermally enhanced DFN with exposed pad (Pin 11 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Inductor switch node | High-current path for synchronous boost topology; requires minimal trace length and low-inductance layout to suppress ringing |
| VIN (Pin 2) | Main input supply | Accepts 0.5–4.5V; powers internal circuitry until VOUT exceeds VIN + 0.3V, then self-biases from output |
| BURST (Pin 3) | Burst Mode control | Resistor-to-GND sets average load current threshold for automatic Burst/PWM transition; grounding forces Burst Mode |
| SS (Pin 4) | Soft-start timing | Capacitor-to-GND programs soft-start duration (t = CSS × 320 ms); prevents inrush during startup and fault recovery |
| SHDN (Pin 5) | Enable/disable control | Logic-level input: <0.25V = shutdown (<1µA IQ); >1V = enable; hysteresis maintains operation as battery drops to 0.65V |
| FB (Pin 6) | Feedback reference | Connects to resistor divider tap; regulates output using 1.216V ±1.2% internal reference |
| VC (Pin 7) | Error amplifier output | Compensation node for loop stability; disconnected during Burst Mode to prevent VC drift |
| RT (Pin 8) | Oscillator frequency set | Resistor-to-GND programs fOSC = 28/RT (MHz); supports synchronization via SYNC pin |
| SYNC (Pin 9) | External clock input | Accepts 100ns–2µs pulses to synchronize internal oscillator; must be grounded if unused |
| VOUT (Pin 10) | Regulated output | Delivers boosted voltage; supplies internal bias and requires ≥10µF low-ESR ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates reverse current flow through internal P-MOSFET body diode during shutdown - critical for battery isolation and zero-load leakage |
| Anti-ringing control | Internally damps SW node oscillation during discontinuous conduction - reduces EMI without external snubbers |
| Programmable soft-start | Adjustable ramp time prevents input surge and output overshoot during power-on or recovery from fault conditions |
| Inrush current limiting | Gradual peak current ramp during startup protects weak input sources (e.g., coin cells or energy harvesters) from collapse |
| Synchronizable oscillator | Enables noise-sensitive systems (e.g., GPS receivers) to align switching edges with quiet time slots or avoid interference bands |
Applications
| Wireless Handsets | GPS Receivers |
|---|---|
Use Scenario: Powering RF transceivers and baseband processors from single-cell Li-ion batteries during burst transmission. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated 3.3V/5V rails with true output disconnect during sleep cycles. Use Value: 96% peak efficiency and 25µA Burst Mode IQ extend talk time and standby duration without compromising RF performance. | Use Scenario: Supplying clean, low-noise 3.3V to GPS baseband ICs and LNA stages in handheld navigation devices. IC Role / Device Role / Timing Role: Fixed-frequency boost regulator synchronized to system clock to avoid spectral interference in 1.575GHz band. Use Value: Programmable 3MHz max frequency and anti-ringing control minimize conducted/radiated emissions near sensitive analog front-ends. |
| MP3 Players | Handheld Computers |
Use Scenario: Generating stable 5V for USB OTG peripherals and audio DACs from partially discharged 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Adjustable-output boost converter with inrush limiting to prevent brownout during headphone amp turn-on. Use Value: 0.88V start-up and 1V operating minimum allow full functionality even at end-of-discharge, extending usable battery capacity. | Use Scenario: Delivering 3.3V to microcontrollers and touch controllers in ruggedized industrial PDAs with wide ambient temperature range. IC Role / Device Role / Timing Role: Thermally robust boost IC with junction temperature monitoring and automatic current derating above 125°C. Use Value: Exposed-pad DFN package and thermal shutdown ensure reliable operation in sealed enclosures without forced airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610995DSKR | Lower IQ (300nA shutdown, 400nA in operation), but no true output disconnect; 2A switch; 0.7V min VIN | Lacks body-diode blocking - unsuitable where battery isolation is required; better for ultra-low-power always-on sensors | Select only if output disconnect is not needed and nanoamp IQ dominates design priority over reverse leakage |
| MAX17222ETA+T | Fixed 3.3V output (non-adjustable); 1.2A switch; 0.4V min VIN; no SYNC or Burst programming | Reduced external component count but inflexible for multi-rail systems; lacks programmability for noise-sensitive apps | Choose when fixed 3.3V output suffices and board space is more constrained than feature flexibility |
Compared with TPS610995DSKR and MAX17222ETA+T, the LTC3422EDD#PBF uniquely combines true output disconnect, 1V start-up, and fully programmable Burst Mode - making it optimal for battery-powered systems requiring both deep discharge utilization and strict power domain isolation.
Availability
LTC3422EDD#PBF is available at Aetrix Electronics and suitable for wireless handsets, GPS receivers, and MP3 players requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3422EDD#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 power management ICs with rigorous characterization and automotive-grade reliability testing.
The LTC3422EDD#PBF belongs to Linear's precision synchronous boost converter product line, engineered specifically for portable battery-powered systems demanding ultra-low start-up voltage, high light-load efficiency, and robust thermal behavior in miniature DFN packages.
FAQ
What is the minimum input voltage required for the LTC3422EDD#PBF to start up?
The LTC3422EDD#PBF guarantees start-up from 0.88V typical (1V specified minimum) using its dedicated low-voltage oscillator. This enables operation from deeply discharged Li-ion cells or energy-harvesting sources before regulation is established. Once VOUT exceeds VIN + 0.3V, the device self-biases from the output, allowing VIN to drop as low as 0.5V during normal operation without affecting regulation.
Does the LTC3422EDD#PBF provide true output disconnect during shutdown?
Yes, the LTC3422EDD#PBF provides true output disconnect by actively controlling its internal P-channel MOSFET to block reverse current flow through the body diode. When SHDN is pulled low, VOUT discharges to 0V with no residual current draw from the input source - essential for battery isolation in portable systems. External Schottky diodes must be omitted to preserve this function.
How is Burst Mode operation configured on the LTC3422EDD#PBF?
Burst Mode on the LTC3422EDD#PBF is configured via a resistor (RB) from BURST pin to GND, where RB (kΩ) = 12 / IEXITBURST (A). This sets the average load current threshold for automatic entry/exit. Grounding BURST forces Burst Mode; connecting to VOUT forces fixed-frequency PWM. The device also includes active VC clamping during Burst Mode to prevent output transients on mode re-entry.
What thermal management requirements apply to the LTC3422EDD#PBF?
The LTC3422EDD#PBF requires soldering of its exposed thermal pad (Pin 11) to a PCB ground plane using multiple vias to achieve θJA = 43°C/W. Without proper thermal coupling, junction temperature may exceed 125°C, triggering automatic current derating and eventual thermal shutdown. Layout must minimize SW node loop area and place input/output capacitors adjacent to respective pins.
Can the LTC3422EDD#PBF operate with input voltage higher than output voltage?
Yes, the LTC3422EDD#PBF supports VIN > VOUT operation by disabling the synchronous rectifier and applying VIN directly to the P-MOSFET gate, effectively turning it into a pass transistor. This maintains regulation without reverse current, but efficiency drops to diode-rectification levels. The device exits Burst Mode automatically when VIN > VOUT – 300mV to ensure stable control.
LTC3422EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 4.5V
- Voltage - Output (Min/Fixed):
- 2.25V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 100kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3422EDD#PBF FAQ
1.How can I place an order for LTC3422EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3422EDD#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 LTC3422EDD#PBF reliable?
The price and inventory of LTC3422EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3422EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3422EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3422EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3422EDD#PBF?
LTC3422EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3422EDD#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 LTC3422EDD#PBF?
For technical support, including LTC3422EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3422EDD#PBF requirements.
6.How does Aetrix verify that LTC3422EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3422EDD#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 LTC3422EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3422EDD#PBF?
All LTC3422EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3422EDD#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 LTC3422EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3422EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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