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Analog Devices Inc. LTC3422EDD#TRPBF
- Part No.:
- LTC3422EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3422EDD#TRPBF.pdf
- Description:
- IC REG BOOST ADJ 1.5A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,813
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Product details
Overview
LTC3422EDD#TRPBF 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 capability, and guaranteed 1V start-up for single-cell Li-ion to 5V power conversion in portable electronics. It integrates 0.20Ω NMOS switch and 0.24Ω PMOS synchronous rectifier, supports adjustable fixed-frequency operation from 100kHz to 3MHz, and delivers up to 96% efficiency.
For engineers reviewing the LTC3422EDD#TRPBF datasheet, LTC3422EDD#TRPBF pinout, LTC3422EDD#TRPBF application, or LTC3422EDD#TRPBF equivalent, key selection considerations include its 1V minimum start-up voltage, programmable Burst Mode threshold, true output disconnect for zero-load leakage, anti-ringing control for EMI reduction, and thermally enhanced 10-pin DFN (3mm × 3mm) package with exposed ground pad.
Technical Context
The LTC3422EDD#TRPBF employs peak current-mode control with adaptive slope compensation, enabling stable operation across wide input (0.5V–4.5V) and output (2.25V–5.25V) ranges. Its independent start-up oscillator initiates switching at 0.88V typical, while internal soft-start and inrush limiting prevent input surge during turn-on.
Burst Mode operation is automatically entered below user-defined load thresholds (programmable via BURST pin resistor), reducing quiescent current to 25µA; fixed-frequency PWM resumes above threshold. The oscillator supports external synchronization (SYNC pin) and frequency programming (RT pin), with shutdown current <1µA and thermal shutdown protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.5V to 4.5V - supports deep discharge Li-ion cells and enables operation even after VOUT exceeds VIN. |
| Output Voltage Range | 2.25V to 5.25V - adjustable via FB resistor divider; 1.216V reference ensures ±2% regulation accuracy. |
| Switching Frequency | 100kHz to 3MHz - programmable via RT pin; synchronizable to external clock on SYNC pin. |
| Efficiency | Up to 96% - achieved via synchronous rectification and low RDS(ON) switches (0.20Ω NMOS / 0.24Ω PMOS). |
| Quiescent Current | 25µA in Burst Mode - extends battery life in standby; <1µA in shutdown. |
| Start-Up Voltage | 0.88V typical - enables reliable boot from single-cell alkaline or deeply discharged Li-ion. |
| Output Disconnect | True - eliminates body diode conduction; prevents reverse current and enables zero-VOUT shutdown. |
Pinout & Package
Package: 10-lead (3mm × 3mm × 0.75mm) thermally enhanced DFN with exposed ground pad (Pin 11), requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for inductor; features internal anti-ringing control to dampen SW ringing in DCM. |
| VIN (Pin 2) | Input supply | Accepts 0.5V–4.5V input; powers IC until VOUT > VIN + 0.3V, then self-biases from VOUT. |
| BURST (Pin 3) | Burst Mode control | Resistor-to-ground sets average load current threshold for automatic Burst/PWM mode transition. |
| SS (Pin 4) | Soft-start timing | Capacitor-to-ground programs soft-start ramp time (t = CSS × 320 ms); inhibits Burst Mode during ramp. |
| SHDN (Pin 5) | Shutdown enable | Logic-low (<0.25V) disables converter; hysteresis allows hold-on down to 0.65V after VOUT > 2.2V. |
| FB (Pin 6) | Feedback input | Monitors resistor-divider tap; regulates output using 1.216V internal reference (±2% over temp). |
| VC (Pin 7) | Error amplifier output | Connects to compensation network; clamped internally for fast transient response. |
| RT (Pin 8) | Frequency adjust | Resistor-to-ground sets fOSC (f = 28/RT MHz); supports sync via external clock on SYNC. |
| SYNC (Pin 9) | Oscillator sync input | Accepts 100ns–2µs pulses; free-running frequency must be ≥20% lower than sync frequency. |
| VOUT (Pin 10) | Regulated output | Delivers up to 700mA continuous; requires ≥10µF ceramic capacitor close to pin and ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates reverse current path via controlled PMOS gate drive - enables zero-VOUT shutdown and prevents battery drain. |
| Adjustable automatic Burst Mode | Programmable entry/exit load threshold (e.g., 12kΩ → ~1A exit) - reduces quiescent current to 25µA without sacrificing light-load regulation. |
| Inrush current limiting | Gradual soft-start ramp combined with controlled peak current rise - limits input surge during startup without external components. |
| Anti-ringing control | Internal impedance connected from SW to VIN during DCM - suppresses high-frequency ringing and reduces EMI radiation. |
| Guaranteed 1V start-up | Independent start-up oscillator activates at 0.88V typical - supports operation from single-cell alkaline, NiMH, or deeply discharged Li-ion sources. |
Applications
| Wireless Handsets | GPS Receivers |
|---|---|
Use Scenario: Powering RF front-end and baseband ICs from single-cell Li-ion battery (2.7V–4.2V) while maintaining stable 3.3V rail during deep discharge. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated 3.3V output with true disconnect to isolate battery during sleep mode. Use Value: Enables >96% efficiency at 200mA load and 2.4V input, extending talk time; 25µA Burst Mode quiescent current minimizes standby drain. | Use Scenario: Supplying 3.3V to GPS baseband processor and RF receiver in handheld navigation devices operating from 1.8V–3.2V input. IC Role / Device Role / Timing Role: Step-up regulator with 1V start-up capability ensuring reliable cold-start under weak battery conditions. Use Value: Guarantees functional boot at 0.88V input, critical for GPS acquisition in low-power tracking modes. |
| MP3 Players | Handheld Computers |
Use Scenario: Generating 5V from single-cell Li-ion for USB OTG or audio DAC circuitry in portable media players. IC Role / Device Role / Timing Role: Adjustable-output boost converter delivering up to 700mA continuous with programmable soft-start to avoid audio pop. Use Value: 2.25V–5.25V output range and 1.216V reference allow precise 5.0V regulation; anti-ringing control suppresses EMI near sensitive analog audio paths. | Use Scenario: Powering 3.3V I/O and core logic in ARM-based handheld PCs powered by dual-cell Li-ion (3.0V–8.4V). IC Role / Device Role / Timing Role: High-frequency (up to 3MHz) boost converter enabling compact layout with small inductors and capacitors. Use Value: 3MHz operation reduces inductor size by >5× vs 500kHz designs; thermally enhanced DFN package sustains 700mA continuous under 40°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5V max input; 1.2A continuous output; no true output disconnect; 1.5µA shutdown current. | Preferred where higher output current and wider VIN range are needed, but zero-VOUT shutdown is not required. | Select TPS61088RHLR when system-level reverse current blocking is handled externally or unnecessary. |
| MAX17222ETA+ | Lower 0.7V min start-up; 400mA continuous output; integrated 1.21V reference; no SYNC or RT pins. | Suitable for ultra-low-power wearables where minimal quiescent current (0.9µA) outweighs output current needs. | Choose MAX17222ETA+ only for sub-400mA loads requiring lowest possible shutdown current and smallest solution size. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3422EDD#TRPBF uniquely combines true output disconnect, 1V start-up, and programmable Burst Mode - making it optimal for battery-powered systems demanding zero-load leakage, cold-start reliability, and adaptive light-load efficiency.
Availability
LTC3422EDD#TRPBF is available at Aetrix Electronics and suitable for wireless handsets, GPS receivers, MP3 players, and handheld computers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3422EDD#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 full product support, documentation, and manufacturing continuity for all Linear-branded power ICs.
The LTC3422EDD#TRPBF belongs to Linear's high-efficiency synchronous boost converter family, designed specifically for space-constrained, battery-operated portable electronics requiring ultra-low quiescent current, true output disconnect, and robust start-up from depleted cells.
FAQ
What is the minimum input voltage required for the LTC3422EDD#TRPBF to start switching?
The LTC3422EDD#TRPBF guarantees start-up at 1V input, with a typical minimum of 0.88V under light load. This is enabled by an independent start-up oscillator that operates before the main control loop engages, allowing reliable boot from single-cell alkaline, NiMH, or deeply discharged Li-ion batteries. Once VOUT exceeds ~2.2V, the device transitions to normal operation and can sustain regulation even if VIN drops to 0.5V.
Does the LTC3422EDD#TRPBF provide true output disconnect, and how is it implemented?
Yes, the LTC3422EDD#TRPBF provides true output disconnect by actively controlling the gate of its internal 0.24Ω P-channel MOSFET synchronous rectifier to prevent body diode conduction. When shut down, VOUT is fully isolated from VIN, drawing no reverse current - critical for zero-load battery drain prevention. This requires no external components but mandates that no Schottky diodes be placed between SW and VOUT, as they would bypass the internal disconnect function.
How is Burst Mode operation configured on the LTC3422EDD#TRPBF?
Burst Mode on the LTC3422EDD#TRPBF is configured via a resistor (RB) from the BURST pin to ground, where RB (in kΩ) ≈ 12 / IEXITBURST (in A). For example, a 12kΩ resistor sets exit at ~1A average load. An optional capacitor (CB ≥ COUT × VOUT / 64,000) filters noise to prevent mode oscillation. Grounding BURST forces Burst Mode; connecting it to VOUT forces fixed-frequency PWM - both manual methods override automatic control.
What thermal design considerations apply to the LTC3422EDD#TRPBF in a 700mA continuous application?
The LTC3422EDD#TRPBF requires soldering of its exposed pad (Pin 11) to a PCB ground plane using multiple thermal vias to achieve θJA = 43°C/W. At 700mA continuous output with 2.4V input and 3.3V output, junction temperature rise is ~35°C above ambient under typical layout. Exceeding 125°C triggers thermal shutdown; sustained operation above 100°C may reduce current limit. Layout must minimize SW trace inductance and place input/output capacitors within 2mm of respective pins.
Can the LTC3422EDD#TRPBF operate with input voltage higher than output voltage?
Yes, the LTC3422EDD#TRPBF supports VIN > VOUT operation by disabling the synchronous rectifier and applying VIN directly to the PMOS gate, effectively turning it into a pass transistor. In this mode, regulation is maintained, but efficiency drops due to resistive loss in the PMOS channel (RDS(ON) = 0.24Ω). Output disconnect remains active during shutdown regardless of VIN/VOUT relationship, preserving zero-reverse-current behavior.
LTC3422EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3422EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3422EDD#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 LTC3422EDD#TRPBF reliable?
The price and inventory of LTC3422EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3422EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3422EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3422EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3422EDD#TRPBF?
LTC3422EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3422EDD#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 LTC3422EDD#TRPBF?
For technical support, including LTC3422EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3422EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3422EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3422EDD#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 LTC3422EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3422EDD#TRPBF?
All LTC3422EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3422EDD#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 LTC3422EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3422EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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