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Analog Devices Inc. LTC3115IDHD-2#PBF
- Part No.:
- LTC3115IDHD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3115IDHD-2#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,339
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Product details
Overview
LTC3115IDHD-2#PBF from Analog Devices is a 40V, 2A monolithic synchronous buck-boost DC/DC converter optimized for fast input transients (<1ms), featuring 2.7V–40V input/output ranges, programmable 100kHz–2MHz switching frequency, and AEC-Q100 qualification for automotive use in 16-lead 4mm × 5mm DFN package.
For engineers reviewing the LTC3115IDHD-2#PBF datasheet, LTC3115IDHD-2#PBF pinout, LTC3115IDHD-2#PBF application, or LTC3115IDHD-2#PBF equivalent, key selection considerations include its seamless buck-boost mode transitions, 3µA shutdown current, Burst Mode® operation with 30µA no-load quiescent current, and support for external clock synchronization up to 2MHz.
Technical Context
The LTC3115IDHD-2#PBF implements a proprietary voltage-mode control architecture with four internal N-channel DMOS switches (150mΩ each) and integrated high-side gate drivers requiring only two external 0.1µF bootstrap capacitors. Its switch control algorithm enables continuous regulation across buck, boost, and buck-boost regions without subharmonic oscillation or output transients during mode transitions.
It features dual feedback paths: one for output voltage regulation via the FB pin (1000mV reference) and another for RUN pin–based input UVLO programming (1.21V threshold with 100mV hysteresis). The VCC/PVCC linear regulator (4.45V typical, 50mV dropout at 5mA) supplies both control circuitry and gate drivers, with mandatory direct connection between VCC and PVCC pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 40V - supports wide-input sources including 12V/24V automotive batteries, FireWire, and unregulated wall adapters. |
| Output Voltage Range | 2.7V to 40V - enables single-converter solutions for variable-output industrial or telecom rails. |
| Max Output Current | 2A in step-down mode (VIN ≥ 6V) - delivers full rated load without derating when input exceeds output. |
| Switching Frequency | 100kHz to 2MHz (programmable via RT pin) - allows trade-off between efficiency and size using 5.2µH (2MHz) to 22µH (500kHz) inductors. |
| Quiescent Current | 30µA in Burst Mode®, 3µA in shutdown - extends battery life in always-on or low-duty-cycle systems. |
| Efficiency | Up to 95% at 5V/1A (VIN = 12V) - minimizes thermal stress and enables compact PCB layouts in thermally constrained enclosures. |
| Package | 16-lead 4mm × 5mm × 0.75mm DFN with exposed PGND pad - provides θJA = 43°C/W for reliable operation up to 125°C junction temperature. |
Pinout & Package
Package: 16-lead plastic DFN (5mm × 4mm × 0.75mm), thermally enhanced with exposed PGND pad (Pin 17) requiring soldering to PCB ground plane for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST1 (Pin 13) | Flying capacitor node for SW1 gate drive | Connects via 0.1µF capacitor to SW1 to generate boosted gate voltage for high-side N-channel switch A. |
| BST2 (Pin 12) | Flying capacitor node for SW2 gate drive | Connects via 0.1µF capacitor to SW2 to generate boosted gate voltage for high-side N-channel switch D. |
| PVIN (Pin 14) | Main power input for buck-boost power stage | Accepts 2.7V–40V input; requires ≥4.7µF ceramic bypass capacitor placed directly at pin with low-inductance ground return. |
| VIN (Pin 10) | VCC regulator input and VIN sense node | Feeds internal LDO; used for input UVLO divider; requires 0.1µF local bypass capacitor. |
| VC (Pin 6) | Error amplifier output | Connects to FB through compensation network (e.g., RC series) to stabilize voltage loop dynamics. |
| FB (Pin 7) | Feedback input (1000mV reference) | Sets output voltage via resistor divider; high-impedance node requiring guard ring routing away from noisy switch traces. |
| RT (Pin 8) | Oscillator frequency programming | Resistor to ground sets switching frequency (e.g., 35.7kΩ → 1MHz); tolerance directly impacts fSW accuracy. |
| PWM/SYNC (Pin 16) | Mode control & external clock input | High = fixed-frequency PWM; low = Burst Mode®; external 100ns+ clock edge synchronizes switching up to 2MHz. |
| RUN (Pin 1) | Enable/UVLO threshold control | 1.21V enable threshold with 100mV hysteresis; driven by resistor divider from VIN to set custom undervoltage lockout. |
| SW1 (Pin 15) | Power switch node (buck path) | Connects to one end of buck-boost inductor; carries full inductor current in all operating modes. |
| SW2 (Pin 2) | Power switch node (boost path) | Connects to other end of buck-boost inductor; critical for reverse-current limiting (−1.5A clamp). |
| PVOUT (Pin 3) | Power output node | Delivers regulated output; requires ≥10µF low-ESR capacitor; Schottky diode recommended for VOUT > 20V short-circuit protection. |
| GND (Pins 4,5) | Signal ground reference | Low-noise reference for control circuitry; must be isolated from PGND except at single-point star ground. |
| PGND (Pin 17) | Power ground (exposed pad) | Primary return path for switch currents; must be soldered to large copper area connected to system ground plane. |
| VCC / PVCC (Pins 9,11) | Internal LDO output & gate driver supply | Mandatory direct connection between VCC and PVCC; bypassed with ≥4.7µF capacitor to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Eliminates output voltage glitches and inductor current discontinuities during VIN crossing VOUT, enabling stable operation in dynamic input environments like automotive cold-crank. |
| Programmable input UVLO with hysteresis | Customizable turn-on/off thresholds (e.g., 24V nominal with 200mV hysteresis) via RUN pin resistor divider, preventing brownout oscillation in fluctuating battery systems. |
| Internal 4.45V VCC LDO with 50mV dropout | Supplies gate drivers and control logic from VIN down to 2.7V, eliminating need for external bias rail while maintaining robust gate drive under low-input conditions. |
| Reverse inductor current limit (−1.5A) | Prevents destructive reverse current flow during light-load boost operation or output short circuits, enhancing reliability in bidirectional power architectures. |
| AEC-Q100 Grade I qualification (−40°C to +125°C) | Validated for automotive under-hood applications including engine control units and ADAS power supplies where thermal and vibration robustness are critical. |
Applications
| Automotive Power Systems | Industrial Wide-Input Power Supplies |
|---|---|
Use Scenario: Powering infotainment head units from 12V battery subject to cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 5V/3.3V rails despite rapid VIN excursions. Use Value: Eliminates need for pre-regulator stages or transient suppressors, reducing BOM count and board area by 30% versus discrete solutions. |
Use Scenario: Providing 24V output from variable 18–36V industrial bus with ±10% line regulation. IC Role / Device Role / Timing Role: Main DC/DC converter delivering regulated output with <0.2% line regulation over full input range. Use Value: Achieves 92% peak efficiency at 2A load without external MOSFETs or controllers, simplifying compliance with IEC 61000-4-5 surge immunity requirements. |
| Telecom & Networking Equipment | FireWire Regulator |
Use Scenario: Generating 12V/1A from 48V PoE midspan supply in network switches with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise buck-boost regulator operating in 750kHz PWM mode synchronized to system clock. Use Value: Meets CISPR-32 Class B conducted emissions with minimal filtering due to ultralow-noise switching algorithm and clean spectral profile. |
Use Scenario: Regulating FireWire 1394a/b ports (28–40V input) to 1.8V/3.3V logic rails in portable audio interfaces. IC Role / Device Role / Timing Role: Input-tolerant converter handling unregulated FireWire source with automatic mode switching. Use Value: Supports hot-plug operation with 3µA shutdown current, extending host device battery life during peripheral disconnection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8390AEDD#PBF | Higher 60V input rating, 3.5A output, but larger 24-lead 4mm × 5mm QFN package and no AEC-Q100 grade. | Preferred for 48V industrial systems requiring >2A load; unsuitable for space-constrained automotive modules. | Select LT8390A when input exceeds 40V or output current >2A is required; verify thermal layout for higher power dissipation. |
| TPS63070DDCR | Lower 16V max input, 2.4A output, 2.5MHz max frequency, and no programmable UVLO or external sync capability. | Cost-optimized for consumer electronics with stable 5–12V inputs; lacks automotive qualification and transient robustness. | Choose TPS63070 for non-automotive, low-voltage applications where footprint and cost outweigh transient performance needs. |
Compared with LT8390A and TPS63070, the LTC3115IDHD-2#PBF uniquely balances 40V input tolerance, AEC-Q100 qualification, and 3µA shutdown current in a compact DFN-making it optimal for automotive and industrial designs requiring reliability under wide-input transients without sacrificing standby efficiency.
Availability
LTC3115IDHD-2#PBF is available at Aetrix Electronics and suitable for automotive power systems, industrial wide-input power supplies, telecom equipment, and FireWire regulator applications requiring stable component supply and long-term lifecycle support.
Supply support for LTC3115IDHD-2#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3115-2 belongs to Analog Devices' Power by Linear™ family of high-voltage DC/DC converters, designed specifically for automotive and industrial applications demanding robust operation across extreme input transients and wide temperature ranges.
FAQ
What is the maximum input voltage rating for the LTC3115IDHD-2#PBF?
The LTC3115IDHD-2#PBF has an absolute maximum input voltage rating of 45V on PVIN and VIN pins, with continuous operation specified from 2.7V to 40V. This 40V operating limit ensures reliable performance in 24V automotive systems experiencing load dump transients, and aligns with AEC-Q100 stress test requirements. Exceeding 40V during normal operation may trigger overvoltage protection or reduce lifetime reliability.
Does the LTC3115IDHD-2#PBF support external clock synchronization?
Yes, the LTC3115IDHD-2#PBF supports external clock synchronization via the PWM/SYNC pin, accepting input frequencies from 100kHz to 2MHz with minimum pulse width of 100ns. When an external clock is applied, the device operates in fixed-frequency PWM mode synchronized to that clock, enabling EMI reduction through frequency dithering or alignment with system timing domains in telecom and networking applications.
What is the purpose of the BST1 and BST2 pins on the LTC3115IDHD-2#PBF?
The BST1 and BST2 pins on the LTC3115IDHD-2#PBF serve as flying capacitor connections for bootstrapping the gate drive voltages of internal high-side N-channel MOSFETs. BST1 connects via a 0.1µF capacitor to SW1 to drive switch A; BST2 connects via a 0.1µF capacitor to SW2 to drive switch D. These pins enable efficient high-side switching without requiring external high-voltage gate drivers or charge pumps.
How does the RUN pin function in the LTC3115IDHD-2#PBF?
The RUN pin on the LTC3115IDHD-2#PBF serves dual functions: enabling/disabling the IC and programming input undervoltage lockout (UVLO). It features a 1.21V nominal enable threshold with 100mV hysteresis and sources 0.5µA to create hysteresis when enabled. Connecting a resistor divider from VIN to RUN allows precise setting of custom UVLO thresholds-critical for automotive cold-crank detection and industrial brownout prevention.
Is the LTC3115IDHD-2#PBF qualified for automotive applications?
Yes, the LTC3115IDHD-2#PBF is AEC-Q100 qualified for automotive applications (Grade I, −40°C to +125°C junction temperature) and manufactured with controlled processes meeting automotive reliability standards. It is explicitly designated for use in automotive power systems, including engine control, ADAS, and infotainment, with full qualification reports available from Analog Devices upon request.
LTC3115IDHD-2#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:
- 800mA, 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)
LTC3115IDHD-2#PBF FAQ
1.How can I place an order for LTC3115IDHD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3115IDHD-2#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 LTC3115IDHD-2#PBF reliable?
The price and inventory of LTC3115IDHD-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3115IDHD-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3115IDHD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3115IDHD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3115IDHD-2#PBF?
LTC3115IDHD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3115IDHD-2#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 LTC3115IDHD-2#PBF?
For technical support, including LTC3115IDHD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3115IDHD-2#PBF requirements.
6.How does Aetrix verify that LTC3115IDHD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3115IDHD-2#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 LTC3115IDHD-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3115IDHD-2#PBF?
All LTC3115IDHD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3115IDHD-2#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 LTC3115IDHD-2#PBF part is unused and in its original packaging.
Return procedure for LTC3115IDHD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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