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Analog Devices Inc. LTC3458EDE#PBF
- Part No.:
- LTC3458EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3458EDE#PBF.pdf
- Description:
- IC REG BOOST ADJ 1.4A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:680
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Product details
Overview
LTC3458EDE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode, synchronous step-up DC/DC converter with true output disconnect, programmable 2V–7.5V output, 1.5V–6V input range, and 1.5MHz max switching frequency. It integrates 0.3Ω N-channel and 0.4Ω P-channel MOSFETs, delivers up to 700mA at 7V from 5V input, and supports USB VBUS power and OLED display biasing.
For engineers reviewing the LTC3458EDE#PBF datasheet, LTC3458EDE#PBF pinout, LTC3458EDE#PBF application, or LTC3458EDE#PBF equivalent, key selection criteria include burst-mode quiescent current (15μA), programmable peak current limit (via ILIM), soft-start timing control (via SS capacitor), and thermal shutdown behavior at ~150°C - all critical for battery-powered portable systems requiring low-noise, regulated boost conversion with zero-output shutdown.
Technical Context
The LTC3458EDE#PBF employs adaptive slope-compensated current-mode control to ensure loop stability across wide VIN/VOUT ratios and load transients. Its architecture includes independent programmability of oscillator frequency (via RT), peak inductor current (via ILIM), soft-start duration (via SS), and Burst Mode entry threshold (via BURST).
True output disconnect is achieved by eliminating body-diode conduction in the internal P-channel synchronous rectifier, enabling VOUT to fall to 0V during shutdown and suppressing inrush current. Antiringing control actively damps SW-node ringing in discontinuous conduction mode using an internal resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5V to 6V - supports single-cell Li-ion (2.5–4.2V), dual alkaline (1.8–3.3V), and USB 5V sources. |
| Output Voltage Range | 2.0V to 7.5V - programmable via external FB divider; reference voltage = 1.23V ±2% over temperature. |
| Max Switching Frequency | 1.5MHz - set by RT resistor; enables compact 3–10μH inductors and reduces solution footprint. |
| NMOS RDS(ON) | 0.3Ω at VOUT = 5V - minimizes conduction loss in high-current boost paths. |
| PMOS RDS(ON) | 0.4Ω at VOUT = 5V - enables efficient synchronous rectification without external Schottky diode. |
| Burst Mode IQ | 15μA typical on VIN - extends battery runtime in standby or light-load states (e.g., OLED display idle). |
| Shutdown Current | <1μA - ensures near-zero system drain when disabled via SHDN pin. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and portable consumer environments. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed PGND pad (Pin 13), 0.75mm profile, thermally enhanced for high-power density operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (12) | Boost output node | Source of P-channel MOSFET and gate drive for both switches; connects directly to output capacitor and load. |
| BURST (11) | Burst Mode threshold control | RC network here sets average load current (~0.1–0.4A) at which automatic transition to Burst Mode occurs. |
| SS (10) | Soft-start timing input | 5μA current source charges external capacitor; tSS = CSS(μF) × 200 ms - prevents output overshoot during startup. |
| GND (9) | Signal ground reference | Low-noise analog ground for error amplifier and feedback sensing; separate from PGND (exposed pad). |
| COMP (8) | Error amplifier output | gm-type output (100μA/V); connects to RC compensation network for loop stability across operating conditions. |
| FB (7) | Feedback voltage sense | Connects to resistor divider tap; regulates output by comparing to 1.23V internal reference. |
| SW (1) | Switch node | Connection point for inductor; features antiringing resistor in DCM to suppress EMI from LC ringing. |
| VIN (2) | Input supply | Power input (1.5–6V); requires ≥1μF local decoupling to minimize input ripple and noise coupling. |
| SYNC (3) | Oscillator synchronization | Accepts external clock (100ns–2μs pulse width); free-running frequency must be ~30% lower than sync target. |
| SHDN (4) | Enable/disable control | Active-high logic: >1.25V enables, <0.3V shuts down - supports direct MCU GPIO control. |
| ILIM (5) | Peak current limit programming | RILIM (kΩ) sets ILIM = 200/RILIM (A); also determines Burst Mode peak current (~¼ of programmed limit). |
| RT (6) | Oscillator frequency programming | RT (kΩ) sets fOSC = 1/(0.2 + 0.004·RT) MHz - enables precise EMI band avoidance and layout optimization. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Enables VOUT = 0V during shutdown and eliminates inrush current - critical for USB OTG and hot-swap applications. |
| Programmable Burst Mode threshold | RC network on BURST pin sets exact load current crossover (e.g., 133kΩ → ~0.075A) between fixed-frequency PWM and ultra-low-IQ operation. |
| Adaptive slope compensation | Automatically adjusts compensation based on VIN/VOUT ratio - ensures stable current-mode control without manual tuning across input/output combinations. |
| Zero-current detection | Disables P-channel rectifier when inductor current falls below ~50mA - prevents reverse current and improves light-load efficiency. |
| Thermal shutdown with hysteresis | Shuts down at ~150°C junction temperature; restarts after ~140°C cooldown - protects against sustained overload or poor PCB thermal design. |
| Antiringing control | Internal resistor across SW node in DCM - suppresses high-frequency ringing without external components, reducing EMI filter burden. |
Applications
| USB VBUS Power | OLED Display Bias |
|---|---|
Use Scenario: Providing regulated 5V or 7V from a 3.3V or 5V USB host port to power downstream peripherals or charging circuits. IC Role / Device Role / Timing Role: Synchronous boost regulator with output disconnect - isolates VBUS from load during suspend and prevents backfeed. Use Value: Eliminates need for external load switch; maintains USB compliance by limiting inrush and enabling clean VBUS ramp-down. | Use Scenario: Generating 7V–7.5V bias rails for OLED panel anode drivers in handheld devices and wearables. IC Role / Device Role / Timing Role: High-efficiency, low-noise boost converter with programmable soft-start - avoids display flicker during power-on. Use Value: 93% peak efficiency and 15μA Burst Mode IQ extend battery life in always-on display modes. |
| Li-ion to 5V Conversion | Two-Cell Alkaline to 5V |
Use Scenario: Stepping up voltage from a single Li-ion cell (2.5–4.2V) to a stable 5V rail for microcontrollers and sensors. IC Role / Device Role / Timing Role: Wide-input, current-mode boost controller with thermal protection - handles full battery discharge curve without dropout. Use Value: 1.5V minimum start-up voltage allows operation down to deeply discharged cells; 0.3Ω/0.4Ω MOSFETs minimize voltage drop at 500mA loads. | Use Scenario: Powering 5V logic from two alkaline cells (1.8–3.3V) in remote controls, medical sensors, or IoT edge nodes. IC Role / Device Role / Timing Role: Low-quiescent-current boost IC with programmable frequency - avoids RF interference in ISM-band wireless modules. Use Value: 1.5MHz operation enables use of tiny 12μH inductors; <1μA shutdown current preserves shelf life in long-storage applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5A switch current rating; fixed 500kHz/1MHz options; no programmable Burst Mode threshold. | Targeted at higher-power loads (>1A); lacks true output disconnect and inrush limiting. | Choose TPS61088RHLR when peak load exceeds 700mA and output disconnect is not required. |
| MAX17222ETA+ | Lower 0.5A switch current; fixed 1.2MHz frequency; integrated 1.21V reference; no ILIM or BURST pins. | Optimized for ultra-small footprint (6-bump WLP); no programmable soft-start or current limit. | Choose MAX17222ETA+ for space-constrained designs where 500mA output and fixed configuration suffice. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3458EDE#PBF uniquely combines true output disconnect, fully programmable Burst Mode entry, and adaptive slope compensation - making it optimal for battery-powered systems demanding precise light-load efficiency control and clean shutdown behavior.
Availability
LTC3458EDE#PBF is available at Aetrix Electronics and suitable for USB VBUS power, OLED display bias, Li-ion to 5V conversion, and two-cell alkaline to 5V applications requiring stable component supply and long-term industrial availability.
Supply support for LTC3458EDE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3458 belongs to Linear's precision power conversion product line, designed specifically for portable, battery-operated systems requiring high efficiency across wide load ranges, programmable operation, and robust protection features.
FAQ
What is the minimum input voltage required for LTC3458EDE#PBF to start switching?
The LTC3458EDE#PBF has a minimum operating input voltage of 1.5V at 0°C to 85°C ambient, and 1.7V at –40°C to 0°C. It can start up from as low as 1.5V, enabling reliable operation across the full discharge curve of single Li-ion or multi-cell alkaline batteries. This specification is confirmed in the Electrical Characteristics table under "Minimum VIN Operating Voltage" with test conditions VIN = 3.3V, VOUT = 5V, RT = 200k.
How does the LTC3458EDE#PBF achieve true output disconnect, and why is it important?
The LTC3458EDE#PBF achieves true output disconnect by preventing body-diode conduction in its internal P-channel synchronous rectifier during shutdown - ensuring VOUT drops to 0V and draws zero current from VIN. This eliminates inrush current at turn-on and enables safe hot-swap capability. It is essential for USB OTG, battery-backed systems, and applications requiring strict isolation between input and output domains.
Can the LTC3458EDE#PBF be synchronized to an external clock, and what are the requirements?
Yes, the LTC3458EDE#PBF supports external synchronization via the SYNC pin (Pin 3). A clock pulse width of 100ns to 2μs is required, and the free-running oscillator frequency must be set ~30% lower than the desired synchronized frequency. For example, to lock to 1.33MHz, RT should be configured for ~1MHz. This capability helps avoid sensitive RF bands and enables deterministic timing in multi-rail systems.
What is the purpose of the BURST pin on the LTC3458EDE#PBF, and how is it configured?
The BURST pin (Pin 11) on the LTC3458EDE#PBF sets the average load current threshold for automatic entry into Burst Mode operation. An RC network (e.g., 133kΩ + 0.015μF) programs IBURST = 10/RBURST (A), allowing precise control over the light-load efficiency crossover point. Connecting BURST to VOUT via 50kΩ forces fixed-frequency PWM mode; grounding forces Burst Mode - enabling flexible dynamic mode control.
Does the LTC3458EDE#PBF require external compensation, and what topology is recommended?
Yes, the LTC3458EDE#PBF requires external compensation via the COMP pin (Pin 8). A standard Type II network (resistor + capacitor in series from COMP to GND, plus parallel capacitor) is recommended. The datasheet Figure 2 specifies RZ = 33kΩ, CC1 = 270pF, CC2 = 10pF for typical 5VOUT designs. Compensation stabilizes the current-mode loop against the right-half-plane zero inherent to boost topology and ensures robust transient response.
LTC3458EDE#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
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 7.5V
- Current - Output:
- 1.4A (Switch)
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LTC3458EDE#PBF FAQ
1.How can I place an order for LTC3458EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3458EDE#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 LTC3458EDE#PBF reliable?
The price and inventory of LTC3458EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3458EDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3458EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3458EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3458EDE#PBF?
LTC3458EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3458EDE#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 LTC3458EDE#PBF?
For technical support, including LTC3458EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3458EDE#PBF requirements.
6.How does Aetrix verify that LTC3458EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3458EDE#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 LTC3458EDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3458EDE#PBF?
All LTC3458EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3458EDE#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 LTC3458EDE#PBF part is unused and in its original packaging.
Return procedure for LTC3458EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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