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Analog Devices Inc. LT8415EDDB#TRMPBF
- Part No.:
- LT8415EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT8415EDDB#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 20MA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,218
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Product details
Overview
LT8415EDDB#TRMPBF from Analog Devices (formerly Linear Technology) is an ultralow-power boost converter IC with dual integrated complementary MOSFET half-bridges (N- and P-channel), on-chip Schottky diode, output disconnect PMOS, and 12.4MΩ/0.4MΩ internal feedback divider. It delivers up to 40V output from 2.5V–16V input, achieves 10.5μA quiescent current in active mode, and supports 34V/0V bidirectional drive of external capacitors for liquid lens or RF MEMS relay biasing.
For engineers reviewing the LT8415EDDB#TRMPBF datasheet, LT8415EDDB#TRMPBF pinout, LT8415EDDB#TRMPBF application, or LT8415EDDB#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed key specifications including 1.235V reference voltage and 240ns minimum switch off-time, and two rigorously cross-checked alternative parts for sensor power and low-power actuator control designs.
Technical Context
The LT8415EDDB#TRMPBF employs a variable peak inductor current and variable off-time control scheme to maintain regulation across wide load ranges while minimizing output voltage ripple and maximizing efficiency. Its internal 1.235V reference feeds a precision error amplifier whose positive input (FBP) sets output voltage via VOUT = 31.85 × VFBP - enabled by integrated high-value resistors that reduce input-referred quiescent current.
Each half-bridge (OUT1/IN1 and OUT2/IN2) uses synchronous N- and P-channel MOSFETs controlled by a single logic-level input, with built-in shoot-through prevention ensuring complementary switching. The integrated PMOS output disconnect switch limits current to 19mA and blocks VOUT from CAP during shutdown, while the SHDN pin incorporates a comparator with 1.30V threshold and 60mV hysteresis for precise enable/disable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports direct battery operation from single Li-ion or multi-cell alkaline stacks without pre-regulation. |
| Output Voltage Range | Up to 40V - enables high-voltage biasing for liquid lenses, RF MEMS relays, and piezoelectric actuators. |
| Quiescent Current | 10.5μA active / 0μA shutdown - extends battery life in always-on sensor nodes and portable medical devices. |
| Reference Voltage | 1.235V ±15mV - stable bandgap reference used to set FBP voltage and thus final regulated VOUT via external resistor divider. |
| Switch Off-Time (min) | 240ns after start-up - ensures fast transient response and stable operation at light loads without pulse-skipping artifacts. |
| Half-Bridge Rise/Fall Time | 2.5μs rise / 3μs fall (34V, 200pF load) - optimized for driving capacitive loads with minimal EMI and overshoot. |
| Output Disconnect Current Limit | 19mA typical - protects against shorted outputs while maintaining safe thermal operation during fault conditions. |
Pinout & Package
LT8415EDDB#TRMPBF is housed in a 12-pin 3mm × 2mm plastic DFN package (DDB) with exposed thermal pad (Pin 13) that must be soldered to PCB ground for thermal and EMI performance. Pin 1 is marked with a bar; top-side marking includes "8415" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (1) | Shutdown control input | Comparator-based enable pin: <0.3V disables chip; >1.4V activates; 60mV hysteresis prevents chatter near threshold. |
| VCC (2) | Main supply input | Accepts 2.5V–16V; requires local 0.1μF bypass capacitor to GND for stable operation and noise immunity. |
| GND (3,13) | Power and signal ground | Pins 3 and 13 both connect to internal ground; Pin 13 is exposed pad - must be soldered to PCB ground plane. |
| SW (4) | Internal NPN switch collector | High-frequency switching node; trace area must be minimized to reduce EMI radiation and parasitic inductance. |
| IN1 / IN2 (5,6) | Half-bridge gate control inputs | Logic-level inputs (0.3V low / >1.1V high); never float - undefined states risk shoot-through or high-impedance outputs. |
| OUT1 / OUT2 (7,8) | Half-bridge output terminals | Drive external capacitors to VOUT or GND; output impedance ~20MΩ when disabled; rise/fall times specified at 34V/200pF. |
| VOUT (9) | PMOS drain output | Regulated high-voltage output; connects to internal PMOS disconnect switch; requires 0.1μF–1μF ceramic bypass capacitor. |
| CAP (10) | Schottky cathode node | Connects to boost inductor and Schottky anode; requires 0.1μF–1μF ceramic capacitor to filter inductor ripple current. |
| VREF (11) | Internal reference output | 1.235V source with 10μA current limit; used to bias FBP via resistor divider; optional 47nF–220nF capacitor enables soft-start. |
| FBP (12) | Error amplifier positive input | Sets output voltage: VOUT = 31.85 × VFBP; accepts external reference or resistor divider from VREF; clamped at 40V max. |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary half-bridges | Integrated N- and P-MOSFETs per channel eliminate external gate drivers and prevent shoot-through via synchronous logic control. |
| Ultralow quiescent current | 10.5μA active mode enables >1-year battery life in coin-cell-powered sensor nodes operating at μA average current. |
| Integrated output disconnect | PMOS switch isolates VOUT from CAP during shutdown, enabling true zero-load leakage and safe hot-swap capability. |
| High-value internal feedback divider | 12.4MΩ/0.4MΩ ratio reduces input-referred quiescent current by >10× versus discrete resistor solutions. |
| Built-in soft-start | VREF pin discharge (70μs) followed by 10μA charge enables controlled VOUT ramp-up, limiting inrush current to <0.3A. |
| Overvoltage protection | Hardware clamping on CAP, VOUT, OUT1, and OUT2 pins prevents damage from transient overvoltage events up to 40V. |
Applications
| Liquid Lens Driver | RF MEMS Relay Power |
|---|---|
|
Use Scenario: Driving electro-wetting liquid lenses in compact endoscopic cameras requiring rapid, bidirectional 34V/0V voltage steps. IC Role / Device Role / Timing Role: Boost converter + dual half-bridge driver providing precise, low-noise 34V bias and fast polarity reversal without external H-bridge components. Use Value: Eliminates discrete MOSFETs and level shifters, reducing BOM count by 6+ components while achieving <5μs transition time between 34V and 0V outputs. |
Use Scenario: Supplying programmable high-voltage bias to RF MEMS switches in 5G front-end modules needing clean, glitch-free 30V activation pulses. IC Role / Device Role / Timing Role: Regulated high-voltage source with integrated output disconnect, enabling fast turn-on/off of MEMS elements without residual voltage holdover. Use Value: Prevents unintended MEMS actuation during sleep mode via 0μA shutdown current and hardware-enforced VOUT isolation from CAP rail. |
| Sensor Power Supply | Low-Power Actuator Bias |
|
Use Scenario: Powering ultra-low-power gas sensors (e.g., NDIR CO₂ detectors) requiring stable 3.3V or 5V from depleted 1.8V–2.5V primary batteries. IC Role / Device Role / Timing Role: Ultralow-IQ boost regulator delivering regulated output with <0.5% load regulation across 10μA–1mA load range. Use Value: Extends operational lifetime beyond 5 years on CR2032 coin cell by maintaining 10.5μA quiescent draw even under full regulation. |
Use Scenario: Providing programmable bias voltage to piezoelectric micro-actuators in haptic feedback systems requiring 10V–30V adjustable output. IC Role / Device Role / Timing Role: Digitally controllable high-voltage source using FBP pin voltage modulation to adjust VOUT from 10V to 34V in real time. Use Value: Enables closed-loop haptic intensity tuning via DAC-driven FBP voltage, eliminating need for external DAC-to-VOUT interface circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter with integrated half-bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3463AEDD#TRPBF | Dual-output boost/inverter with 250mA switch current; no integrated half-bridges; requires external H-bridge for bidirectional drive. | Supports ±40V outputs but lacks native 34V/0V push-pull capability; better suited for bipolar sensor excitation than liquid lens driving. | Select when bipolar output (±V) is required and external MOSFETs are acceptable; avoid when board space or EMI constraints prohibit discrete bridges. |
| LT1945EDE#TRPBF | Dual boost/inverter with 350mA switch current; 10-lead MSOP; no output disconnect or integrated Schottky diode. | Higher output current capability but lacks PMOS disconnect and integrated diode - increases component count and reduces shutdown isolation. | Choose for higher-current RF MEMS arrays where 350mA drive is needed; not recommended for battery-critical applications due to 40μA IQ. |
Compared with LT8415EDDB#TRMPBF, LT3463AEDD#TRPBF offers bipolar output flexibility but adds external components for unidirectional high-voltage drive, while LT1945EDE#TRPBF delivers more current at higher quiescent cost and reduced integration - making LT8415EDDB#TRMPBF optimal for space-constrained, ultra-low-power 34V/0V actuator biasing.
Availability
LT8415EDDB#TRMPBF is available at Aetrix Electronics and suitable for liquid lens driver circuits, RF MEMS relay power supplies, and ultra-low-power sensor biasing applications requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for LT8415EDDB#TRMPBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8415EDDB#TRMPBF belongs to Linear's ultralow-power DC/DC converter family, designed specifically for energy-constrained applications demanding high-voltage generation with minimal standby current - such as wearable biosensors, portable diagnostic tools, and miniaturized optical systems.
FAQ
What is the maximum output voltage supported by the LT8415EDDB#TRMPBF?
The LT8415EDDB#TRMPBF supports a maximum regulated output voltage of 40V, enforced by internal overvoltage protection circuitry on the VOUT, CAP, OUT1, and OUT2 pins. Even if the FBP pin voltage is driven above the nominal 1.235V reference, the output will clamp at 40V to prevent device damage or external component overstress.
How does the LT8415EDDB#TRMPBF achieve ultralow quiescent current?
The LT8415EDDB#TRMPBF achieves 10.5μA quiescent current through multiple design features: integrated high-value (12.4MΩ/0.4MΩ) feedback resistors that minimize input-referred current, a low-power oscillator architecture, and optimized bias networks. In shutdown mode, it draws 0μA by fully disabling all internal regulators and switching elements - verified across the –40°C to 125°C junction temperature range.
Can the LT8415EDDB#TRMPBF drive capacitive loads directly without external components?
Yes - the LT8415EDDB#TRMPBF is explicitly designed to drive external capacitors to 34V/0V using its dual half-bridge outputs (OUT1 and OUT2). Each output delivers 2.5μs rise time and 3μs fall time into 200pF loads, as confirmed in the datasheet timing diagrams. No external MOSFETs, gate drivers, or level shifters are required for standard liquid lens or RF MEMS applications.
What is the function of the VREF pin on the LT8415EDDB#TRMPBF?
The VREF pin on the LT8415EDDB#TRMPBF provides a stable 1.235V reference voltage with 10μA current sourcing capability. It serves two critical roles: (1) biasing the FBP pin via an external resistor divider to set the output voltage (VOUT = 31.85 × VFBP), and (2) enabling soft-start when a capacitor (47nF–220nF) is connected to ground - the internal 10μA current source ramps VREF to 1.235V, controlling VOUT slew rate.
Does the LT8415EDDB#TRMPBF include overvoltage protection, and on which pins?
Yes - the LT8415EDDB#TRMPBF includes hardware overvoltage protection on four pins: CAP, VOUT, OUT1, and OUT2. Each is rated for absolute maximum voltages up to 40V, and internal clamping circuitry activates if any of these pins exceed their safe operating range. This protection is independent of regulation loop behavior and operates even during startup or fault conditions.
LT8415EDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-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):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 20mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (3x2)
LT8415EDDB#TRMPBF FAQ
1.How can I place an order for LT8415EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8415EDDB#TRMPBF 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 LT8415EDDB#TRMPBF reliable?
The price and inventory of LT8415EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8415EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8415EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8415EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8415EDDB#TRMPBF?
LT8415EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8415EDDB#TRMPBF 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 LT8415EDDB#TRMPBF?
For technical support, including LT8415EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8415EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT8415EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8415EDDB#TRMPBF 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 LT8415EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8415EDDB#TRMPBF?
All LT8415EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8415EDDB#TRMPBF, 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 LT8415EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT8415EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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