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Analog Devices Inc. LTC3862IGN#PBF
- Part No.:
- LTC3862IGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3862IGN#PBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,532
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Product details
Overview
LTC3862IGN#PBF from Analog Devices is a two-phase, constant-frequency, peak current mode boost/SEPIC DC/DC controller driving N-channel MOSFETs. It operates from 4V to 36V input, delivers up to 96% max duty cycle, supports 75kHz–500kHz adjustable switching frequency, and features internal 5V/3.8V LDOs for gate drive and analog circuitry. It is used in high-efficiency automotive telecom power supplies requiring phase interleaving and precise current sensing.
For engineers reviewing the LTC3862IGN#PBF datasheet, LTC3862IGN#PBF pinout, LTC3862IGN#PBF application, or LTC3862IGN#PBF equivalent, key selection criteria include its dual-phase current-mode architecture, programmable DMAX/BLANK/SLOPE pins, AEC-Q100 qualification (I-grade), 24-lead narrow SSOP package, and multi-phase synchronization via SYNC/CLKOUT/PHASEMODE.
Technical Context
The LTC3862IGN#PBF implements fixed-frequency peak current mode control with two interleaved channels operating 180° out of phase, reducing input/output ripple and filter component stress. Its error amplifier drives the ITH pin to set per-cycle peak current thresholds, while slope compensation (via SLOPE pin) stabilizes operation across duty cycles.
It integrates cascaded PMOS LDOs: INTVCC (5V, 50mA) powers gate drivers, and 3V8 (3.8V) supplies analog/digital circuitry. Phase relationships (CH1–CH2, CH1–CLKOUT) are programmable via PHASEMODE (0V/float/3V8), enabling 2-/3-/4-/6-/12-phase configurations using SYNC and CLKOUT signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 36V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Switching Frequency | 75kHz to 500kHz - set by external resistor on FREQ pin; enables optimization of efficiency vs. size trade-offs. |
| Max Duty Cycle | Up to 96% - configurable via DMAX pin (SGND=96%, float=84%, 3V8=75%), critical for high-step-up ratios like 12V→48V. |
| Current Sense Threshold | 65mV to 90mV (typ. 75mV) - low-offset, matched ±10mV between channels, enabling accurate per-phase current limiting. |
| Reference Voltage | ±1% accuracy at 1.223V - ensures stable output voltage regulation under line/load/temperature variation. |
| Gate Drive | 5V output referenced to PGND - directly drives logic-level N-MOSFETs (e.g., Renesas HAT2266) without level-shifting. |
| Operating Temp | –40°C to +125°C - qualified per AEC-Q100 Grade I, suitable for under-hood automotive environments. |
Pinout & Package
Package: 24-lead narrow plastic SSOP (GN24), 0.25mm lead pitch, θJA = 85°C/W, exposed pad not present (unlike QFN/TSSOP variants).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DMAX (Pin 1) | Duty cycle limit control | Configures max on-time: SGND = 96%, float = 84%, 3V8 = 75% - prevents instability at extreme duty cycles. |
| GATE1/GATE2 (Pins 16,18) | N-MOSFET gate drivers | 5V outputs referenced to PGND - drive logic-level MOSFETs with RDS(ON) pull-up/down of 2.1Ω/0.7Ω. |
| SENSE1+/SENSE2+ (Pins 23,13) | Current sense positive inputs | Accept differential voltage across sense resistors; trip threshold set by ITH voltage and slope-compensated ramp. |
| PHASEMODE (Pin 4) | Interleaving phase selector | Defines CH1–CH2 phase offset: 0V = 180°, float = 180°, 3V8 = 120° - enables 2-/3-/4-/6-/12-phase expansion. |
| SYNC/CLKOUT (Pins 11,10) | Multi-phase clock interface | SYNC accepts 50–650kHz external clock; CLKOUT provides synchronized output for daisy-chaining controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output capacitor RMS current by ~70% vs. single-phase, lowering thermal stress and ESR requirements. |
| Programmable leading edge blanking | Adjusts minimum on-time (180ns/260ns/340ns) via BLANK pin to suppress gate-drive-induced current-sense noise. |
| Internal 5V/3.8V dual LDOs | Eliminates need for external bias rails; INTVCC powers gate drivers (50mA), 3V8 powers analog/digital core (low-noise supply). |
| Precision RUN pin with hysteresis | 1.22V enable threshold with 80mV hysteresis - prevents erratic startup/shutdown during noisy supply transitions. |
| AEC-Q100 Grade I qualification | Validated for automotive applications including infotainment, ADAS power rails, and body electronics modules. |
Applications
| Automotive 48V Mild Hybrid Systems | Telecom Intermediate Bus Converters |
|---|---|
Use Scenario: Step-up from 12V battery to 48V rail for electric turbochargers and active suspension. IC Role / Device Role / Timing Role: Two-phase boost controller managing parallel MOSFETs with interleaved timing to minimize input ripple and EMI. Use Value: 96% max duty cycle enables efficient 12V→48V conversion; AEC-Q100 I-grade ensures reliability in under-hood thermal environments. | Use Scenario: Generating stable 48V intermediate bus from –48V or 24V telecom rectified input. IC Role / Device Role / Timing Role: SEPIC controller supporting wide VIN range and bidirectional energy flow capability. Use Value: Adjustable slope compensation and matched current sense ensure stability across varying line/load conditions typical in telecom base stations. |
| Industrial LED Driver Power Stages | Medical Imaging Power Modules |
Use Scenario: High-current constant-current boost supply for surgical lighting arrays requiring low-output ripple. IC Role / Device Role / Timing Role: Dual-channel current-mode controller delivering precise per-phase current regulation with soft-start sequencing. Use Value: Programmable soft-start (SS pin) and precision 1.223V reference ensure repeatable, flicker-free LED turn-on across temperature. | Use Scenario: Compact, isolated auxiliary power for CT/MRI detector bias rails needing ultra-low noise and high reliability. IC Role / Device Role / Timing Role: Boost controller operating in pulse-skip mode at light load to maintain efficiency down to 10mA. Use Value: ±1% reference and <10mV channel-to-channel sense matching enable sub-0.5% output regulation critical for imaging signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost/SEPIC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3862EUH#PBF | Same die, 5mm×5mm QFN-24 package with θJA = 44°C/W (vs. 85°C/W for SSOP); exposed PGND pad requires PCB soldering. | Better thermal performance for high-power density designs; unsuitable where SSOP footprint or leaded assembly is required. | Select when thermal headroom is constrained and QFN reflow capability exists. |
| LTC3862IFE#PBF | Same functionality, TSSOP-24 package with θJA = 38°C/W; identical I-grade temp range (–40°C to +125°C). | Higher thermal efficiency than SSOP but larger footprint than QFN; compatible with legacy TSSOP layouts. | Choose for improved thermal margin over SSOP without migrating to QFN layout. |
Compared with LTC3862IGN#PBF, the EUH variant offers superior thermal dissipation for high-current designs, while the IFE variant balances thermal performance and manufacturability in TSSOP form - both retain identical control features, pinout, and AEC-Q100 qualification.
Availability
LTC3862IGN#PBF is available at Aetrix Electronics and suitable for automotive 48V systems, telecom intermediate bus converters, and industrial LED driver power stages requiring stable component supply and long-term lifecycle support.
Supply support for LTC3862IGN#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 industrial, automotive, communications, and healthcare markets.
The LTC3862 product line delivers high-efficiency, multi-phase boost/SEPIC controllers optimized for demanding power conversion applications where precision, reliability, and thermal robustness are critical - especially in automotive and telecom infrastructure.
FAQ
What is the maximum allowable input voltage for the LTC3862IGN#PBF?
The LTC3862IGN#PBF has an absolute maximum input supply voltage (VIN) rating of 40V, with recommended continuous operation from 4V to 36V. Exceeding 40V may cause permanent damage. The device's internal UVLO and thermal protection help safeguard operation within this range, and its 36V upper limit supports 24V industrial and 12V automotive battery systems with transient tolerance.
How does the PHASEMODE pin affect multi-phase configuration in the LTC3862IGN#PBF?
The PHASEMODE pin on the LTC3862IGN#PBF sets the phase relationship between Channel 1 and Channel 2 (180° at 0V or float, 120° at 3V8) and determines CH1-to-CLKOUT alignment (90°, 60°, or 240°). This enables deterministic 2-, 3-, 4-, 6-, or 12-phase operation when multiple LTC3862IGN#PBF units are synchronized via SYNC/CLKOUT, reducing system-level ripple and improving dynamic response.
Can the LTC3862IGN#PBF drive standard-threshold MOSFETs?
No - the LTC3862IGN#PBF provides only a 5V gate drive referenced to PGND, optimized specifically for logic-level N-channel MOSFETs (e.g., RDS(ON) specified at VGS = 4.5V–5V). For standard-threshold MOSFETs requiring ≥10V gate drive, Analog Devices recommends the LTC3862-1 variant, which features a 10V INTVCC LDO and compatible control architecture.
What is the purpose of the 3V8 pin on the LTC3862IGN#PBF?
The 3V8 pin on the LTC3862IGN#PBF is the output of an internal 3.8V LDO powered from INTVCC. It supplies low-noise bias to the IC's analog and digital control circuitry (error amplifier, comparators, PLL, logic). A 1nF ceramic capacitor must be placed between 3V8 and SGND - it is not intended for external loads and must not be used as a system supply rail.
Does the LTC3862IGN#PBF support pulse-skip mode, and how is it activated?
Yes - the LTC3862IGN#PBF enters pulse-skip mode automatically when the ITH pin voltage falls below 0.275V (with 25mV hysteresis). This reduces switching losses at light loads, improving efficiency below ~10% of full scale. No external components are needed; the behavior is inherent to the error amplifier's output clamping and comparator threshold design.
LTC3862IGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 75kHz ~ 500kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
LTC3862IGN#PBF FAQ
1.How can I place an order for LTC3862IGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3862IGN#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 LTC3862IGN#PBF reliable?
The price and inventory of LTC3862IGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3862IGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3862IGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3862IGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3862IGN#PBF?
LTC3862IGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3862IGN#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 LTC3862IGN#PBF?
For technical support, including LTC3862IGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3862IGN#PBF requirements.
6.How does Aetrix verify that LTC3862IGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3862IGN#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 LTC3862IGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3862IGN#PBF?
All LTC3862IGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3862IGN#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 LTC3862IGN#PBF part is unused and in its original packaging.
Return procedure for LTC3862IGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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