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Analog Devices Inc. LTC3458LEDE#PBF
- Part No.:
- LTC3458LEDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC3458LEDE#PBF.pdf
- Description:
- IC REG BOOST ADJ 1.4A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:582
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Product details
Overview
LTC3458LEDE#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode, synchronous step-up DC/DC converter with true output disconnect, programmable 1.5–6 V output, 1.5 MHz switching frequency, and ultralow 12 μA Burst Mode quiescent current. It integrates 0.2 Ω N-channel and 0.3 Ω P-channel MOSFETs and targets battery-powered portable electronics requiring regulated 5 V from Li-ion or dual-alkaline sources.
For engineers reviewing the LTC3458LEDE#PBF datasheet, LTC3458LEDE#PBF pinout, LTC3458LEDE#PBF application, or LTC3458LEDE#PBF equivalent, key selection criteria include output disconnect capability, inrush limiting, programmable peak current limit (1.7 A typical), soft-start control, and thermal shutdown at ~150°C - all critical for USB VBUS, GPS, and MP3 player power rails.
Technical Context
The LTC3458LEDE#PBF employs adaptive slope-compensated current-mode control to ensure loop stability across input (1.5–6 V) and output (2–6 V) ranges without external compensation tuning. Its architecture includes independent programmable blocks for oscillator frequency (via RT pin), peak current limit (ILIM), Burst Mode threshold (BURST), and soft-start timing (SS).
True output disconnect is achieved by actively blocking body diode conduction in the internal P-channel synchronous rectifier, enabling zero-volt VOUT during shutdown and eliminating reverse current. Antiringing control on the SW pin dampens LC ringing in discontinuous conduction mode to reduce EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Synchronous boost converter with integrated 0.2 Ω NMOS and 0.3 Ω PMOS switches |
| Input Voltage Range | 1.5 V to 6 V - supports single Li-ion (3.1–4.2 V), dual alkaline (1.8–3.3 V), or 3.3 V system rails |
| Output Voltage Range | Programmable 2 V to 6 V via resistor divider on FB pin - enables direct 5 V USB VBUS generation |
| Switching Frequency | Programmable up to 1.5 MHz (RT pin) or synchronizable externally - allows noise-sensitive RF coexistence |
| Burst Mode IQ | 12 μA typical on VIN - extends battery runtime in standby GPS or audio playback modes |
| Peak Current Limit | 1.7 A typical (RILIM = 84.5 kΩ) - sets maximum inductor current to prevent saturation |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable consumer environments |
| Shutdown Current | <1 μA - ensures near-zero drain during system sleep or off-state |
Pinout & Package
Package: 12-lead (4 mm × 3 mm) thermally enhanced DFN with exposed PGND pad (Pin 13), 0.75 mm profile. Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Switch node | Connection point for external inductor; antiringing resistor engages in DCM to suppress EMI |
| VIN (2) | Input supply | Power input (1.5–6 V); requires ≥1 μF local decoupling |
| SYNC (3) | Oscillator sync input | Accepts external clock (100 ns–2 μs pulse); disables internal oscillator when grounded |
| SHDN (4) | Enable/disable control | Active-high logic: <0.3 V = shutdown, >1.25 V = active; tolerant up to 6 V |
| ILIM (5) | Peak current programming | Resistor-to-GND sets ILIMIT = 180/RILIM (A/kΩ); defaults to 1.7 A at 84.5 kΩ |
| RT (6) | Oscillator frequency programming | Resistor-to-GND sets fOSC = 1/(0.2 + 0.004·RT) MHz (400 kHz–1.5 MHz) |
| FB (7) | Feedback reference input | Resistor divider tap; regulates VOUT = 1.225·(1 + R1/R2); reference tolerance ±1.2% over temp |
| COMP (8) | Error amplifier output | gm-type output (60 μA/V); connects to RC network for loop compensation |
| GND (9) | Signal ground | Reference for internal circuitry; tied to exposed PGND pad |
| SS (10) | Soft-start control | Capacitor-to-GND sets tSS = 200·CSS (ms); 5 μA internal current source ramps voltage |
| BURST (11) | Burst Mode threshold | RC network programs average load current threshold for automatic Burst Mode entry/exit |
| VOUT (12) | Regulated output | Source of synchronous rectifier and gate drive; delivers up to 750 mA at 5 V (Li-ion input) |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates reverse current and inrush surge by disabling P-MOSFET body diode conduction during shutdown |
| Programmable Burst Mode threshold | RC network on BURST pin sets precise average load current (e.g., 100 mA) for automatic light-load efficiency optimization |
| Adaptive slope compensation | Automatically adjusts compensation based on VIN/VOUT ratio - ensures stable current-mode operation without manual tuning |
| Antiringing control | Internal resistor across SW node in DCM reduces high-frequency ringing and EMI emissions |
| Thermal shutdown with hysteresis | Shuts down at ~150°C junction temperature; restarts after ~140°C cooldown - protects against sustained overload |
| Zero-current detection (IZERO) | Disables synchronous rectifier when inductor current drops below ~50 mA - prevents negative current and losses |
Applications
| USB VBUS Power | Portable GPS Receivers |
|---|---|
Use Scenario: Generating stable 5 V from a single-cell Li-ion battery (3.1–4.2 V) to power USB peripherals in handheld navigation devices. IC Role / Device Role / Timing Role: Primary synchronous boost regulator with output disconnect - isolates VBUS from battery during host suspend or cable removal. Use Value: Prevents backfeed into battery and eliminates inrush current spikes that could reset USB enumeration or damage port controllers. | Use Scenario: Supplying clean, regulated 5 V to GPS RF front-end and baseband ICs in battery-operated location trackers. IC Role / Device Role / Timing Role: High-efficiency power stage delivering up to 750 mA with <12 μA quiescent current in Burst Mode during satellite acquisition standby. Use Value: Extends time-between-charges by >30% versus fixed-frequency converters under intermittent GPS duty cycles. |
| MP3 Player Audio Power | Point-of-Load Regulation |
Use Scenario: Providing low-noise 5 V rail for DAC, headphone amplifier, and SD card interface in flash-based music players. IC Role / Device Role / Timing Role: Programmable boost converter with soft-start and feed-forward capacitor support to minimize output ripple during volume transitions. Use Value: Reduces audible pop/click artifacts by controlling dV/dt during power-on and load transients via SS and BURST pin tuning. | Use Scenario: Local 3.3 V or 5 V regulation from intermediate 3.6 V or 4.2 V battery rails in compact embedded systems with space-constrained layouts. IC Role / Device Role / Timing Role: Compact (4 mm × 3 mm) DFN-packaged step-up regulator with integrated power switches and thermal pad for PCB heat spreading. Use Value: Enables high-density board designs without external Schottky diodes or discrete MOSFETs - reduces BOM count by 4 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCR | Fixed 5 V output (non-programmable), 1.5 A switch current, no output disconnect, 2.5 μA IQ in shutdown | Lacks true output disconnect and programmable VOUT - unsuitable for USB VBUS where reverse current must be blocked | Select only if fixed 5 V output suffices and output disconnect is not required; lower cost but less flexible |
| MAX17062ETA+ | 2.5 V to 5.5 V input, 2.5 V to 5.5 V output, 1.2 A switch, integrated soft-start, no Burst Mode | No Burst Mode or programmable frequency - higher light-load IQ (~25 μA) limits battery life in intermittent-use devices | Prefer for simpler designs needing only basic boost without advanced efficiency modes or precision disconnect |
Compared with TPS61200DRCR and MAX17062ETA+, the LTC3458LEDE#PBF uniquely combines programmable output voltage, true output disconnect, and ultralow 12 μA Burst Mode IQ - making it optimal for USB-powered portable systems where battery longevity and reverse-current safety are mandatory.
Availability
LTC3458LEDE#PBF is available at Aetrix Electronics and suitable for USB VBUS power, portable GPS receivers, MP3 player audio subsystems, and point-of-load regulation requiring stable component supply and long-term lifecycle support.
Supply support for LTC3458LEDE#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 LTC3458L product line was designed specifically for high-efficiency, low-quiescent-current boost conversion in space- and battery-constrained portable electronics - emphasizing output disconnect, programmability, and thermal robustness.
FAQ
What is the minimum input voltage required for the LTC3458LEDE#PBF to regulate 5 V output?
The LTC3458LEDE#PBF requires a minimum input voltage of 1.5 V at 0°C to 85°C (1.7 V at –40°C to 0°C) to maintain regulation. For reliable 5 V output from a single Li-ion cell (3.1–4.2 V), the LTC3458LEDE#PBF operates well within its input range and delivers up to 750 mA with >90% efficiency. Below 1.5 V, the device may enter undervoltage lockout or fail to sustain regulation.
How does the LTC3458LEDE#PBF achieve true output disconnect, and why is it important?
The LTC3458LEDE#PBF achieves true output disconnect by actively controlling its internal P-channel MOSFET to block body diode conduction during shutdown - ensuring VOUT drops to 0 V and draws zero current from VIN. This prevents reverse current flow and inrush surges, which is essential for USB VBUS compliance and protecting upstream battery or power sources. Without this feature, external diodes would be needed, increasing size and losses.
Can the LTC3458LEDE#PBF operate without an external inductor?
No, the LTC3458LEDE#PBF cannot operate without an external inductor. It is a synchronous boost converter requiring an external inductor (e.g., 7.4 μH at 1 MHz) to store and transfer energy. The inductor value must be selected per the datasheet's recommended table to ensure stable current-mode operation, proper slope compensation, and transient response. Omitting the inductor will cause immediate failure or unregulated output.
What is the purpose of the BURST pin on the LTC3458LEDE#PBF, and how is it configured?
The BURST pin on the LTC3458LEDE#PBF programs the average load current threshold for automatic entry/exit from Burst Mode. An RC network (e.g., 133 kΩ + 0.01 μF) sets IBURST = 10/RBURST (A). To force fixed-frequency PWM mode, connect BURST to VOUT via a 51 kΩ resistor. Grounding BURST forces Burst Mode. This pin enables dynamic efficiency optimization without firmware intervention.
Does the LTC3458LEDE#PBF require external compensation components, and if so, what are they?
Yes, the LTC3458LEDE#PBF requires external compensation on the COMP pin: typically a series RC network (e.g., 33 kΩ + 10 pF) from COMP to GND, plus a feedback divider (R1/R2) on FB. These components stabilize the current-mode loop, counteract the right-half-plane zero inherent to boost topology, and ensure phase margin >45°. The datasheet provides design equations and layout guidance - skipping compensation risks oscillation or poor transient response.
LTC3458LEDE#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):
- 6V
- 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)
LTC3458LEDE#PBF FAQ
1.How can I place an order for LTC3458LEDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3458LEDE#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 LTC3458LEDE#PBF reliable?
The price and inventory of LTC3458LEDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3458LEDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3458LEDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3458LEDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3458LEDE#PBF?
LTC3458LEDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3458LEDE#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 LTC3458LEDE#PBF?
For technical support, including LTC3458LEDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3458LEDE#PBF requirements.
6.How does Aetrix verify that LTC3458LEDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3458LEDE#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 LTC3458LEDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3458LEDE#PBF?
All LTC3458LEDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3458LEDE#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 LTC3458LEDE#PBF part is unused and in its original packaging.
Return procedure for LTC3458LEDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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