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Analog Devices Inc. LT8337EV#PBF
- Part No.:
- LT8337EV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFQFN Exposed Pad
- Datasheet:
-
LT8337EV#PBF.pdf
- Description:
- IC REG BOOST PROG 5A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
LT8337EV#PBF from Analog Devices is a low-quiescent-current, synchronous step-up DC/DC converter with Silent Switcher architecture and PassThru mode. It integrates 28V/5A power switches, operates from 2.7V to 28V input, delivers up to 26V output, and supports programmable switching frequency from 300kHz to 3MHz. It is used in battery-powered systems requiring ultralow EMI and high efficiency at light loads.
For engineers reviewing the LT8337EV#PBF datasheet, LT8337EV#PBF pinout, LT8337EV#PBF application, or LT8337EV#PBF equivalent, key selection criteria include its 4µA Burst Mode quiescent current, 100% duty-cycle PassThru capability for VIN > VOUT, integrated 28V/5A MOSFETs, SSFM-enabled CISPR Class 5 EMI compliance, and PG flag for output monitoring.
Technical Context
The LT8337EV#PBF uses fixed-frequency current-mode control with slope compensation and an internal 3.5V INTVCC regulator. Its block diagram confirms dual-MOSFET synchronous topology with M1 (top) and M2 (bottom) switches, error amplifier feedback via FB, and power-good monitoring via open-drain PG pin.
PassThru mode activates automatically when VIN exceeds VOUT by >0 V (rising) or >–0.6 V (falling), disabling M1 and holding M2 fully on-enabling direct conduction with minimal dropout. The SYNC/MODE pin selects among five operational modes including Burst, Pulse-Skipping, SSFM, and external synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 28V - supports wide battery chemistries (Li-ion, LiFePO₄, multi-cell alkaline) without pre-regulation |
| Output Voltage Range | Up to 26V - programmable via FB resistor divider; enables single-stage boost for industrial sensors or display bias rails |
| VIN Quiescent Current | 4µA in Burst Mode - extends battery life in always-on IoT nodes with intermittent wake cycles |
| Switching Frequency | 300kHz–3MHz (programmable via RT resistor) - balances inductor size vs. efficiency; 2MHz typical for compact 2.2µH designs |
| Integrated Power Switches | 28V/5A synchronous MOSFETs - eliminates external FETs and gate drivers; reduces BOM count and layout area |
| EMI Performance | CISPR 25 Class 5 compliant with SSFM enabled - meets automotive EMC requirements without added shielding or filters |
| PassThru Threshold | VIN – VOUT ≥ 0 V (rising) - enables seamless transition to direct conduction when input exceeds output, minimizing power loss |
Pinout & Package
LT8337EV#PBF is housed in a 16-lead 3mm × 3mm LQFN package with exposed thermal pad (Pin 17 = GND). The package supports 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 via voltage/resistor; ignored during PassThru or startup |
| RT (2) | Frequency programming | Resistor to GND sets fSW from 300kHz–3MHz; must not be left floating |
| GND (3,5,8,17) | Power & signal ground | Exposed pad (17) must be soldered to PCB ground plane for thermal and EMI performance |
| FB (4) | Feedback input | Monitors output via resistor divider; regulates VOUT to 1.000V ±0.6% over temperature |
| VOUT (6,7) | Output power terminals | Two dedicated pins for Silent Switcher capacitor placement: each requires 1µF ceramic to adjacent GND pin |
| SW (9,10,11) | Switch node | Three paralleled pins connect to inductor and BST capacitor; reduce conduction loss and EMI loop area |
| BST (12) | Bootstrap supply | 0.1µF capacitor between BST and SW supplies top MOSFET gate driver |
| VIN (13) | Main input supply | Accepts 2.7V–28V; powers INTVCC LDO and internal circuitry |
| EN/UVLO (14) | Enable & undervoltage lockout | Shuts down IC below 0.94V (falling); 90mV hysteresis prevents chatter near threshold |
| INTVCC (15) | Internal 3.5V regulator bypass | Requires ≥1µF ceramic cap to GND; no external loading permitted |
| PG (16) | Power good indicator | Open-drain output pulled low if VOUT deviates >±8%, EN/UVLO <1V, INTVCC low, or thermal shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Dual VOUT-to-GND capacitors (pins 6–5 and 7–8) form EMI-cancelling loops, enabling Class 5 radiated/conducted EMI compliance |
| PassThru™ mode | 100% duty cycle operation when VIN > VOUT - eliminates switching loss and reduces dropout to ~35mV (M2 RDS(on)) |
| Low IQ Burst Mode | 4µA VIN quiescent current at light load - extends runtime in battery-powered applications with infrequent activity |
| Programmable soft-start | Soft-start time set by RT value (e.g., 1.4ms at 47.5kΩ) - prevents inrush current and output overshoot during startup |
| Output overvoltage lockout | Hardware protection triggers if FB rises >12% above regulation - safeguards downstream components from fault conditions |
Applications
| Portable Medical Sensors | Automotive Infotainment Displays |
|---|---|
Use Scenario: Wearable glucose monitor with OLED display powered from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: Step-up converter generating stable 12V bias for OLED backlight while maintaining <4µA sleep current. Use Value: Enables >7-day battery life between charges using Burst Mode; Silent Switcher ensures display noise immunity without added EMI filtering. | Use Scenario: Head unit display requiring 15V rail from 12V automotive battery (9–16V range) with cold-crank immunity. IC Role / Device Role / Timing Role: Synchronous boost delivering [email protected] with PassThru fallback during cranking (VIN dips to 6V). Use Value: Maintains display operation during engine start via seamless PassThru transition; CISPR Class 5 compliance avoids radio interference. |
| Industrial IoT Edge Nodes | Railway Signaling Modules |
Use Scenario: Wireless vibration sensor node powered by two AA batteries (1.8–3.2V), transmitting data every 5 minutes. IC Role / Device Role / Timing Role: High-efficiency boost supplying 5V to MCU and RF transceiver, optimized for intermittent load profiles. Use Value: 4µA Burst Mode IQ extends shelf life beyond 10 years; programmable fSW allows 3MHz operation for ultra-compact 1.5µH inductor. | Use Scenario: LED status panel in train control cabinet operating from 24V nominal rail (18–32V range) with strict EMI limits. IC Role / Device Role / Timing Role: Generates isolated 24V auxiliary rail for optical isolators using SSFM-enabled 2MHz switching. Use Value: Meets EN 50121-3-2 railway EMI standards without ferrite beads or shielded inductors; -40°C to 125°C rating ensures reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8337JV#PBF | Same electrical specs but rated for –40°C to 150°C junction temperature; higher θJA (42.8°C/W same, but wider temp range validated) | Required for under-hood automotive or industrial environments exceeding 125°C ambient | Select LT8337JV#PBF when operating junction temperature may exceed 125°C; otherwise LT8337EV#PBF suffices for most commercial/industrial use. |
| LT8337EV-1#PBF | Replaces PG pin with VC pin for external loop compensation; removes power-good flag; retains identical switching, PassThru, and EMI performance | Suitable where fast transient response is prioritized over output monitoring (e.g., FPGA core rails) | Choose LT8337EV-1#PBF only when external compensation is needed for dynamic load steps; retain LT8337EV#PBF for systems requiring PG confirmation. |
Compared with LT8337JV#PBF and LT8337EV-1#PBF, the LT8337EV#PBF uniquely combines power-good monitoring, –40°C to 125°C operation, and integrated PG functionality-making it optimal for battery-powered systems needing both reliability assurance and extended runtime.
Availability
LT8337EV#PBF is available at Aetrix Electronics and suitable for portable medical sensors, automotive infotainment displays, and industrial IoT edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8337EV#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 product line delivers high-efficiency, low-EMI synchronous boost conversion for space-constrained, battery-sensitive applications-designed specifically for systems demanding ultralow quiescent current and robust electromagnetic compatibility.
FAQ
What is the maximum output voltage supported by the LT8337EV#PBF?
The LT8337EV#PBF supports output voltages up to 26V, set by the external resistor divider on the FB pin. Its internal feedback reference is 1.000V ±0.6% over temperature, and the device maintains regulation accuracy across its full input range (2.7V–28V) and load conditions. This makes the LT8337EV#PBF suitable for applications such as display bias supplies and industrial sensor excitation rails.
How does PassThru mode operate in the LT8337EV#PBF?
PassThru mode in the LT8337EV#PBF activates automatically when VIN exceeds VOUT by ≥0 V (rising threshold). In this state, the top switch (M1) turns off permanently and the bottom switch (M2) remains fully on, creating a low-dropout path from VIN to VOUT through the inductor and M2's RDS(on) (~35 mΩ). The LT8337EV#PBF draws only 15µA in this mode, enabling high-efficiency operation during input-over-output conditions without switching losses.
What is the purpose of the dual VOUT pins (6 and 7) on the LT8337EV#PBF?
The dual VOUT pins (6 and 7) on the LT8337EV#PBF enable Analog Devices' Silent Switcher architecture: one 1µF capacitor must be placed between Pin 6 and adjacent GND (Pin 5), and another between Pin 7 and adjacent GND (Pin 8). These form complementary high-frequency current loops that cancel magnetic fields, reducing radiated EMI by up to 20 dB. This configuration is mandatory to achieve CISPR 25 Class 5 compliance with the LT8337EV#PBF.
Can the LT8337EV#PBF synchronize to an external clock?
Yes, the LT8337EV#PBF can synchronize to an external clock applied to the SYNC/MODE pin (Pin 1). When an external clock signal within 300kHz–3MHz is present, the device enters synchronized pulse-skipping mode. This feature allows timing alignment with system clocks or other converters to avoid beat frequencies and simplify EMI filtering-critical in multi-rail power systems where the LT8337EV#PBF is deployed alongside other switching regulators.
What is the minimum recommended output capacitance for stable operation of the LT8337EV#PBF?
The LT8337EV#PBF requires two 1µF ceramic capacitors-one between VOUT (Pin 6) and GND (Pin 5), and another between VOUT (Pin 7) and GND (Pin 8)-as part of its Silent Switcher layout. Additionally, ≥2.2µF bulk capacitance must be placed close to the IC with low-ESR characteristics. Total effective output capacitance should be ≥4.7µF to ensure stability across load transients and maintain <1% output ripple in pulse-skipping mode; insufficient capacitance risks loop instability and PG flag false triggering.
LT8337EV#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#PBF FAQ
1.How can I place an order for LT8337EV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8337EV#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#PBF reliable?
The price and inventory of LT8337EV#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#PBF is usually 5 days.
3.What payment methods are accepted for LT8337EV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8337EV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8337EV#PBF?
LT8337EV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8337EV#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#PBF?
For technical support, including LT8337EV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8337EV#PBF requirements.
6.How does Aetrix verify that LT8337EV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8337EV#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#PBF meets industry standards.
7.What is the process for return or replacement of LT8337EV#PBF?
All LT8337EV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8337EV#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#PBF part is unused and in its original packaging.
Return procedure for LT8337EV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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