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Analog Devices Inc. LTC3115EDHD-1#PBF
- Part No.:
- LTC3115EDHD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115EDHD-1#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 1A/2A 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
LTC3115EDHD-1#PBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter in a 16-lead 4mm × 5mm DFN package. It supports input/output voltages from 2.7V to 40V, delivers up to 2A output current in step-down mode (VIN ≥ 6V), operates at programmable switching frequencies up to 2MHz, and features Burst Mode® operation for ultralow 50µA no-load quiescent current - ideal for automotive power systems with wide-input battery rails.
For engineers reviewing the LTC3115EDHD-1#PBF datasheet, LTC3115EDHD-1#PBF pinout, LTC3115EDHD-1#PBF application, or LTC3115EDHD-1#PBF equivalent, key selection criteria include its 2.7V–40V bidirectional VIN/VOUT range, 95% peak efficiency, AEC-Q100 qualification, thermal performance in the DHD package (θJA = 43°C/W), and seamless buck-boost mode transitions without output disturbance.
Technical Context
The LTC3115EDHD-1#PBF implements a proprietary four-switch synchronous buck-boost topology with internal N-channel DMOS switches (150mΩ each) and integrated high-side gate drivers requiring only two external 0.1µF bootstrap capacitors. Its voltage-mode control loop enables stable regulation across all operating regions - buck, boost, and buck-boost - with no subharmonic oscillation or transient discontinuity during mode transitions.
It supports dual operating modes: fixed-frequency PWM (100kHz–2MHz, synchronizable externally) and low-noise Burst Mode® with 30µA typical no-load input current. The device integrates programmable input UVLO (2.7V threshold, 100mV hysteresis), internal soft-start (9ms), output disconnect in shutdown, and comprehensive protection including short-circuit, reverse inductor current limit (−1.5A), and overtemperature shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports lead-acid, Li-ion, and industrial 24V/28V rails without pre-regulation |
| Output Voltage Range | 2.7V to 40V - fully adjustable via FB resistor divider; maintains regulation regardless of VIN vs VOUT relationship |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V); 1A when VIN ≥ 3.6V and VOUT = 5V - defines usable load capability under common automotive conditions |
| Switching Frequency | 100kHz to 2MHz - set by RT resistor; higher frequencies enable smaller magnetics and reduced board area |
| Peak Efficiency | 95% - achieved at mid-load in PWM mode; reduces thermal stress and improves system power density |
| Quiescent Current | 50µA in Burst Mode®, 3µA in shutdown - extends battery runtime in always-on vehicle modules |
| Operating Temp Range | –40°C to +125°C junction - qualified per AEC-Q100 Grade E, suitable for under-hood automotive environments |
Pinout & Package
The LTC3115EDHD-1#PBF is housed in a thermally enhanced 16-lead (5mm × 4mm × 0.75mm) plastic DFN package with an exposed PGND pad (Pin 17) that must be soldered to the PCB ground plane for rated thermal performance (θJA = 43°C/W, θJC = 4.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM/SYNC | Mode control & sync input | High = fixed-frequency PWM; low = Burst Mode®; external clock input up to 2MHz - enables noise-sensitive or synchronized system designs |
| SW1 / SW2 | Power switch terminals | Connect to opposite ends of buck-boost inductor; support bidirectional current flow during all operating modes |
| PVIN / PVOUT | High-voltage power rails | PVIN supplies power stage; PVOUT delivers regulated output - both rated to 45V absolute max, require local bulk/low-ESR capacitors |
| BST1 / BST2 | Flying capacitor connections | Each connects to SW1/SW2 via 0.1µF capacitor - generates gate drive voltage for high-side N-channel switches |
| FB | Voltage feedback input | Senses output via resistor divider; nominal 1000mV reference - sets precise output voltage with ±0.3% line/load regulation |
| RUN | Enable & UVLO programming | 1.21V enable threshold; 0.5µA hysteresis current - allows custom input undervoltage lockout using external resistor divider |
| PGND (exposed pad) | Power ground return | Primary thermal and current path - must be soldered to large copper area for thermal integrity and low-noise grounding |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage glitch and inductor current discontinuity during VIN crossing VOUT - critical for stable rail generation in variable-input systems |
| Integrated VCC linear regulator | Generates 4.45V ±1.2% VCC from VIN (2.7V–40V); powers internal circuitry and gate drivers - removes need for external bias supply |
| Reverse inductor current limit | −1.5A clamping on PVOUT side - prevents destructive reverse current during startup, shutdown, or fault recovery in buck-dominant applications |
| Programmable input UVLO | Adjustable 2.4V–2.8V threshold with 100mV hysteresis - ensures reliable start-up and brown-out protection across temperature and battery chemistries |
| Internal soft-start | 9ms monotonic output ramp - limits inrush current into output capacitors and avoids triggering upstream supply foldback |
Applications
| Automotive Infotainment Power Supply | Industrial 24V Rail Regulator |
|---|---|
Use Scenario: Powers display, audio DSP, and USB peripherals from a 9V–16V automotive battery with cold-crank dips to 3.6V and load-dump surges to 40V. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 5V/3.3V rails independent of input transients. Use Value: Eliminates need for separate pre-buck and post-boost stages; sustains operation during cranking without brownout. | Use Scenario: Generates isolated 12V and 5V outputs from unregulated 24V factory floor supply subject to ripple and dropout. IC Role / Device Role / Timing Role: Single-chip wide-input DC/DC converter delivering regulated outputs with minimal external components. Use Value: Reduces BOM count and layout area vs. discrete buck+boost solution; handles 24V ±25% variation without derating. |
| FireWire® (IEEE 1394) Regulator | Multisource Portable Equipment |
Use Scenario: Supplies regulated 5V/1.8V rails to FireWire transceivers and PHYs from legacy 12V or 3.3V host ports with poor regulation. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling compliant FireWire power delivery across nonstandard inputs. Use Value: Meets IEEE 1394a VDD tolerance (±5%) despite input variations; supports hot-plug with soft-start and output disconnect. | Use Scenario: Powers medical handheld devices accepting input from USB-C PD (5–20V), LiPo battery (3.0–4.2V), or 12V wall adapter. IC Role / Device Role / Timing Role: Universal input DC/DC controller adapting to any source while maintaining constant output voltage. Use Value: Enables single PCB design across multiple power sources; Burst Mode® extends battery life >2× vs. standard PWM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3115IDHD-1#PBF | Identical electrical specs and pinout; rated for same −40°C to +125°C junction temperature | No functional difference; differs only in screening/test grade (I-grade vs E-grade) | Select when extended reliability testing or tighter parametric binning is required for mission-critical systems |
| MAX20406AETL+ | 36V max input, 3.5A output, 2.2MHz max fSW; uses current-mode control; no Burst Mode® | Higher current, faster switching, but higher light-load IQ (25µA typical) and no AEC-Q100 qualification | Prefer for space-constrained industrial apps needing >2A; avoid where automotive qualification or <50µA standby is mandatory |
Compared with LTC3115IDHD-1#PBF, the LTC3115EDHD-1#PBF offers identical performance at lower cost for commercial-automotive applications; versus MAX20406AETL+, it provides superior automotive compliance, lower quiescent current, and seamless mode transitions - critical for battery-backed and transient-prone systems.
Availability
LTC3115EDHD-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 24V power supplies, and FireWire® regulator designs requiring stable component supply, AEC-Q100 qualification, and long-term lifecycle support.
Supply support for LTC3115EDHD-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC3115-1 product line delivers high-voltage, high-efficiency buck-boost converters designed specifically for automotive and industrial power systems where input voltage varies widely and reliability under extreme conditions is mandatory.
FAQ
What is the maximum input voltage rating for the LTC3115EDHD-1#PBF?
The LTC3115EDHD-1#PBF has an absolute maximum input voltage rating of 45V on PVIN and VIN pins. Its operational input voltage range is specified from 2.7V to 40V, making it suitable for 24V/28V industrial rails and automotive systems experiencing load dump transients. Exceeding 45V risks permanent damage per Absolute Maximum Ratings.
Does the LTC3115EDHD-1#PBF support synchronization to an external clock?
Yes, the LTC3115EDHD-1#PBF supports external clock synchronization via the PWM/SYNC pin. When driven with a clean CMOS-level clock signal between 100kHz and 2MHz, the device locks its switching frequency and phase to the external source - essential for reducing EMI in noise-sensitive systems like automotive ADAS or medical imaging equipment.
How does the RUN pin function on the LTC3115EDHD-1#PBF?
The RUN pin on the LTC3115EDHD-1#PBF serves dual functions: enabling/disabling the IC and programming input undervoltage lockout (UVLO). It triggers enable at 1.21V (typical) and sources 0.5µA hysteresis current. Connecting a resistor divider from VIN to GND sets custom UVLO thresholds - for example, 2.7V UVLO with 100mV hysteresis - ensuring robust start-up behavior across temperature.
What thermal considerations apply to the LTC3115EDHD-1#PBF in the DHD package?
The LTC3115EDHD-1#PBF in the 16-lead DFN (DHD) package has θJA = 43°C/W and θJC = 4.3°C/W. To achieve rated thermal performance, the exposed PGND pad (Pin 17) must be soldered to a minimum 200mm² copper area connected to the PCB ground plane via ≥4 thermal vias. Without proper thermal land, junction temperature rise will exceed specifications under 2A load.
Can the LTC3115EDHD-1#PBF operate with output voltage higher than input voltage?
Yes, the LTC3115EDHD-1#PBF operates seamlessly in boost mode when VOUT > VIN - for example, generating 12V from a 5V USB source or 24V from a 12V battery. Its four-switch architecture and proprietary control algorithm maintain regulation without interruption, even as VIN crosses VOUT, eliminating output glitches common in hybrid buck-boost solutions.
LTC3115EDHD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 2.2V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1A, 2A
- Frequency - Switching:
- 100kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LTC3115EDHD-1#PBF FAQ
1.How can I place an order for LTC3115EDHD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115EDHD-1#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 LTC3115EDHD-1#PBF reliable?
The price and inventory of LTC3115EDHD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3115EDHD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115EDHD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115EDHD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115EDHD-1#PBF?
LTC3115EDHD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115EDHD-1#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 LTC3115EDHD-1#PBF?
For technical support, including LTC3115EDHD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115EDHD-1#PBF requirements.
6.How does Aetrix verify that LTC3115EDHD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115EDHD-1#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 LTC3115EDHD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115EDHD-1#PBF?
All LTC3115EDHD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115EDHD-1#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 LTC3115EDHD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3115EDHD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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