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Analog Devices Inc. LT8337EV-1#PBF
- Part No.:
- LT8337EV-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFQFN Exposed Pad
- Datasheet:
-
LT8337EV-1#PBF.pdf
- Description:
- IC REG BOOST PROG 5A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:946
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Product details
Overview
LT8337EV-1#PBF from Analog Devices is a low-quiescent-current, synchronous step-up DC/DC converter with Silent Switcher architecture and external compensation capability. It integrates 28V/5A power switches, supports 2.7V–28V input, delivers up to 26V output, operates at 300kHz–3MHz, and enables PassThru mode for VIN > VOUT battery systems.
For engineers reviewing the LT8337EV-1#PBF datasheet, LT8337EV-1#PBF pinout, LT8337EV-1#PBF application, or LT8337EV-1#PBF equivalent, key selection criteria include external VC compensation for fast transient response, ultralow EMI performance per CISPR25 Class 5, 15µA PassThru quiescent current, and 16-lead 3mm × 3mm LQFN package with exposed thermal pad.
Technical Context
The LT8337EV-1#PBF implements fixed-frequency current-mode control with programmable switching frequency (300kHz–3MHz) and selectable operating modes via SYNC/MODE pin-including Burst Mode, Pulse-Skipping, and SSFM. Its internal 28V/5A synchronous MOSFETs support 100% duty cycle in PassThru mode when VIN exceeds VOUT.
Unlike the LT8337 variant, the LT8337EV-1#PBF features VC pin for external loop compensation-enabling precise bandwidth and phase margin tuning-and omits the PG (Power Good) flag. It maintains identical Silent Switcher topology, dual-VOUT capacitor layout for EMI cancellation, and thermal performance (–40°C to 125°C junction).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 28V - supports single-cell Li-ion to 24V industrial rails without pre-regulation. |
| Output Voltage Range | Up to 26V - programmable via FB resistor divider; enables high-side bias for gate drivers or op-amp supplies. |
| Switching Frequency | 300kHz to 3MHz - set by RT-to-GND resistor; higher frequencies allow smaller inductors (e.g., 1.5μH at 3MHz). |
| VIN Quiescent Current | 23µA (typ) in PassThru mode - extends battery runtime when input voltage exceeds regulated output. |
| VC Pin Transconductance | 0.4mS - defines error amplifier gain for stable external compensation network design. |
| EMI Performance | CISPR25 Class 5 compliant - achieved via integrated Silent Switcher architecture and mandatory dual 1µF VOUT–GND capacitors. |
| Operating Temperature | –40°C to +125°C (junction) - qualified for automotive cabin and industrial edge applications. |
Pinout & Package
LT8337EV-1#PBF uses a 16-lead, 3mm × 3mm LQFN package with exposed thermal pad (Pin 17 = GND). The package provides θJCbottom = 8.2°C/W for efficient PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYNC/MODE (1) | Mode selection & sync input | Selects Burst/Pulse-Skipping/SSFM/Sync modes; ignored during PassThru or startup. |
| RT (2) | Frequency programming | Resistor-to-GND sets switching frequency (300kHz–3MHz); open circuit not allowed. |
| GND (3,5,8,17) | Ground reference & thermal path | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and EMI performance. |
| FB (4) | Feedback input | Monitors output voltage via resistor divider; regulates VOUT to 1.000V (±1.2%) reference. |
| VOUT (6,7) | Output power terminals | Must connect two separate 1µF ceramic caps (VOUT–GND) to enable Silent Switcher EMI cancellation. |
| SW (9,10,11) | Switch node | Connects to inductor and BST capacitor; carries high di/dt; requires tight layout to minimize EMI. |
| BST (12) | Bootstrap supply | 0.1µF capacitor between BST and SW powers top MOSFET gate driver. |
| VIN (13) | Main input supply | Accepts 2.7V–28V; powers internal LDO (INTVCC) and high-side switch driver. |
| EN/UVLO (14) | Enable & undervoltage lockout | Shuts down IC below ~1.0V; allows programmable turn-on threshold using resistor divider. |
| INTVCC (15) | Internal 3.5V regulator bypass | Requires ≥1µF low-ESR ceramic cap; powers gate drivers and control logic; no external load permitted. |
| VC (16) | Error amplifier output & compensation | Connects to external RC network for loop stability tuning; replaces PG pin of LT8337 variant. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Dual, matched VOUT–GND capacitor paths cancel magnetic fields, enabling CISPR25 Class 5 radiated/conducted EMI compliance without shielding. |
| External VC compensation | Enables full control over loop bandwidth and phase margin-critical for fast transient response in dynamic load applications like RF power amplifiers. |
| PassThru mode operation | 100% duty cycle with synchronous MOSFET on-reduces dropout to <600mV and cuts quiescent current to 23µA when VIN > VOUT. |
| Spread spectrum modulation (SSFM) | ±0.45% frequency dither over ±20% range-lowers peak EMI by spreading energy across spectrum, easing EMC certification. |
| Low IQ Burst Mode | 23µA typical VIN quiescent current at light loads-extends battery life in always-on IoT sensors and portable medical devices. |
Applications
| Battery-Powered Portable Instruments | Automotive Infotainment Power Rails |
|---|---|
Use Scenario: Handheld multimeters, portable oscilloscopes, and gas detectors requiring stable 15V rail from single Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Synchronous boost converter with PassThru mode to maintain regulation as battery discharges below output voltage. Use Value: 23µA PassThru quiescent current extends battery runtime; Silent Switcher ensures clean power without EMI filters. |
Use Scenario: Powering LCD bias, audio amplifiers, or USB-C PD controllers in vehicle head units where 5V/12V bus coexists with 24V battery. IC Role / Device Role / Timing Role: Wide-input (2.7–28V) boost converter delivering 18V from 12V bus or 24V battery with automatic PassThru fallback. Use Value: Eliminates need for separate buck-boost IC; SSFM meets automotive CISPR25 Class 5 emissions limits. |
| Industrial Sensor Signal Conditioning | Medical Wearable Power Management |
Use Scenario: Providing isolated ±15V for precision op-amps and ADC drivers in field transmitters powered by 4–20mA loop or coin cell. IC Role / Device Role / Timing Role: High-efficiency, low-noise boost stage feeding charge-pump inverter; VC pin enables tight regulation under varying sensor load. Use Value: External compensation ensures stability with low-ESR ceramic output caps; 2.7V min VIN supports depleted primary cells. |
Use Scenario: ECG/PPG patches requiring 3.3V and 5V rails from CR2032 (2.0–3.0V) with multi-day battery life. IC Role / Device Role / Timing Role: Primary boost converter with Burst Mode and SSFM-minimizing both quiescent draw and EMI near sensitive analog front-ends. Use Value: 23µA PassThru current and 4µA Burst Mode enable >7-day operation; compact 3mm × 3mm footprint fits constrained wearable PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8337EV#PBF | Includes PG pin for power-good monitoring; lacks VC pin-uses internal compensation only. | Preferred where system-level fault reporting (e.g., MCU reset on output fault) is required over loop tuning flexibility. | Select LT8337EV#PBF if power sequencing or fault detection is critical; avoid if custom loop response is needed. |
| TPS61088RHLR | Lower max input (18V), no PassThru mode, no SSFM, higher 25µA quiescent current in light-load PFM mode. | Suitable for cost-sensitive consumer electronics where CISPR25 compliance is not mandated. | Choose TPS61088RHLR for non-automotive, non-industrial designs with ≤18V input and relaxed EMI requirements. |
Compared with LT8337EV#PBF, the LT8337EV-1#PBF trades power-good signaling for external loop control-enabling faster transient response in dynamic loads-while both share identical efficiency, EMI performance, and PassThru capability. Against TPS61088RHLR, LT8337EV-1#PBF offers superior input range, lower quiescent current, and certified EMI reduction at the cost of higher BOM complexity.
Availability
LT8337EV-1#PBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, automotive infotainment power rails, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LT8337EV-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8337/LT8337-1 product line delivers ultralow-EMI, high-efficiency synchronous boost conversion for space-constrained, noise-sensitive applications-designed specifically for battery systems needing PassThru mode and robust EMC compliance.
FAQ
What is the key functional difference between LT8337EV-1#PBF and LT8337EV#PBF?
The LT8337EV-1#PBF replaces the PG (Power Good) pin with a VC (Voltage Compensation) pin for external loop compensation, enabling precise bandwidth and phase margin tuning. In contrast, the LT8337EV#PBF provides an open-drain PG flag for output voltage monitoring but uses internal compensation only. Both share identical switching performance, Silent Switcher architecture, PassThru capability, and package.
Does LT8337EV-1#PBF support spread spectrum frequency modulation (SSFM)?
Yes, LT8337EV-1#PBF supports SSFM when the SYNC/MODE pin is pulled to INTVCC or driven with a 50kΩ resistor to GND. SSFM spreads the switching frequency by ±0.45% over ±20% of fSW, reducing peak radiated and conducted EMI to meet CISPR25 Class 5 requirements without additional filtering components.
What is the minimum recommended output capacitance for stable operation of LT8337EV-1#PBF?
LT8337EV-1#PBF requires two 1µF ceramic capacitors-one between Pin 6 (VOUT) and Pin 5 (GND), and another between Pin 7 (VOUT) and Pin 8 (GND)-to complete the Silent Switcher EMI cancellation loop. Additional bulk capacitance (≥2.2µF) should be placed close to the IC. Total effective capacitance must be verified against loop stability with the chosen external VC compensation network.
Can LT8337EV-1#PBF operate with input voltage higher than output voltage?
Yes, LT8337EV-1#PBF supports PassThru mode when VIN exceeds VOUT. In this mode, the top synchronous MOSFET remains fully on and the bottom switch stays off, effectively shorting VIN to VOUT through the inductor and MOSFET-achieving <600mV dropout and reducing VIN quiescent current to 23µA (typical), ideal for battery systems during discharge.
What thermal considerations apply to LT8337EV-1#PBF in high-power operation?
LT8337EV-1#PBF has θJCbottom = 8.2°C/W, requiring the exposed pad (Pin 17) to be soldered to a solid PCB ground plane for optimal heat transfer. At full 5A load and high VIN/VOUT differentials, junction temperature must stay ≤125°C. Derating is advised above 85°C ambient; thermal vias under the pad and copper pour improve dissipation.
LT8337EV-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 16-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 26V
- Current - Output:
- 5A
- Frequency - Switching:
- 300kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LQFN (3x3)
LT8337EV-1#PBF FAQ
1.How can I place an order for LT8337EV-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8337EV-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 LT8337EV-1#PBF reliable?
The price and inventory of LT8337EV-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 LT8337EV-1#PBF is usually 5 days.
3.What payment methods are accepted for LT8337EV-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8337EV-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8337EV-1#PBF?
LT8337EV-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8337EV-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 LT8337EV-1#PBF?
For technical support, including LT8337EV-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8337EV-1#PBF requirements.
6.How does Aetrix verify that LT8337EV-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT8337EV-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 LT8337EV-1#PBF meets industry standards.
7.What is the process for return or replacement of LT8337EV-1#PBF?
All LT8337EV-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8337EV-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 LT8337EV-1#PBF part is unused and in its original packaging.
Return procedure for LT8337EV-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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