My Inquiry
My Account
Analog Devices Inc. LTC3899HFE#PBF
- Part No.:
- LTC3899HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3899HFE#PBF.pdf
- Description:
- IC REG CTRLR BCK/BCK-BST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:345
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3899HFE#PBF from Analog Devices (formerly Linear Technology) is a high-performance triple-output synchronous buck/buck/boost DC/DC controller driving all-N-channel MOSFET stages. It operates from 4.5V to 60V input, delivers up to 60V output on boost channel, supports phase-lockable switching up to 850kHz, and maintains regulation down to 2.2V input during cold-crank - enabling use in automotive start-stop systems.
For engineers reviewing the LTC3899HFE#PBF datasheet, LTC3899HFE#PBF pinout, LTC3899HFE#PBF application, or LTC3899HFE#PBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 29µA sleep-mode quiescent current, programmable 5V–10V gate drive, OPTI-LOOP® compensation, and dual-buck-plus-boost topology for multi-rail power delivery in harsh environments.
Technical Context
The LTC3899HFE#PBF implements constant-frequency current-mode control across three independent channels: two synchronous buck regulators (VFB1/VFB2 = 0.8V reference) and one synchronous boost regulator (VFB3 = 1.2V reference, configurable to 10V/12V via VPRG3). Its architecture supports pulse-skipping, Burst Mode®, and forced continuous conduction modes, with separate RUN pins enabling independent channel enable/disable.
It integrates internal top-gate bootstrap switches eliminating external diodes, features OPTI-DRIVE™ for 5V–10V gate drive programming, and uses OPTI-LOOP® compensation to optimize transient response across wide output capacitance and ESR ranges. The device includes dedicated soft-start (TRACK/SS1,2, SS3), frequency programming (FREQ), and PLL synchronization (PLLIN/MODE) pins for system-level timing coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V operating; sustains regulation down to 2.2V after startup - critical for automotive cold-crank survival. |
| Output Configuration | Triple output: two buck channels (0.8V feedback), one boost channel (1.2V feedback, fixed 10V/12V or adjustable via resistors). |
| Switching Frequency | Programmable 50kHz–900kHz; phase-lockable 75kHz–850kHz - enables EMI reduction and clock domain alignment. |
| Quiescent Current | 29µA in sleep mode (one channel active); 3.6µA shutdown - extends battery runtime in always-on systems. |
| Gate Drive Voltage | Programmable 5V–10V via DRVSET pin - supports logic-level or standard MOSFETs without external level-shifting. |
| Operating Temperature | –40°C to +150°C junction (H-grade) - qualified for under-hood automotive and industrial high-temp environments. |
| Package | 38-lead TSSOP (FE package) with exposed thermal pad - provides robust thermal performance (θJA = 25°C/W). |
Pinout & Package
Package: 38-lead plastic TSSOP (FE), 5mm × 7mm footprint, exposed GND pad (Pin 39) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1, RUN2, RUN3 (Pins 9,10,11) | Independent channel enable inputs | Each pin controls one regulator; <1.2V disables channel, all <0.7V forces full shutdown - enables flexible power sequencing. |
| TG1/TG2/TG3 (Pins 32,18,27) | Top N-MOSFET gate drivers | Floating outputs with DRVCC-referenced swing - drives high-side FETs without external bootstrap diodes. |
| BG1/BG2/BG3 (Pins 29,21,25) | Bottom N-MOSFET gate drivers | GND-referenced outputs - complements TG pins for synchronous rectification and high efficiency. |
| VPRG3 (Pin 34) | Boost output mode selector | Float = adjustable; GND = 10V fixed; INTVCC = 12V fixed - simplifies design for common boost rail requirements. |
| DRVSET (Pin 16) | Gate drive voltage programming | Resistor-to-GND sets DRVCC from 5V–10V - optimizes FET RDS(on) and switching loss trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| No external bootstrap diodes required | Integrated top-gate bootstrap switches reduce BOM count and layout area while improving reliability. |
| OPTI-LOOP® compensation | Allows stable loop compensation across wide range of output capacitor types and ESR values - eliminates trial-and-error tuning. |
| 100% duty cycle capability (boost) | Enables direct pass-through operation when input ≥ output - critical for high-efficiency backup power paths. |
| 99% duty cycle (buck) | Supports ultra-low dropout operation - maintains regulation even with minimal input-output differential. |
| Independent channel RUN control | Per-channel enable/disable allows dynamic rail management and low-power state partitioning in multi-processor systems. |
Applications
| Automotive Start-Stop Systems | Industrial Distributed Power |
|---|---|
Use Scenario: Powering infotainment, ADAS sensors, and body control modules during engine cranking where battery drops to 2.2V. IC Role / Device Role / Timing Role: Triple-output controller delivering stable 5V, 8.5V, and regulated 10V rails from wide-input automotive battery. Use Value: Maintains regulation through cold crank via 2.2V minimum input operation and low 29µA sleep IQ. | Use Scenario: Generating isolated auxiliary rails (e.g., 5V, 12V, 24V) from a central 48V DC bus in factory automation equipment. IC Role / Device Role / Timing Role: Synchronous buck/buck/boost controller managing three independent loads with precise voltage tracking and sequencing. Use Value: Programmable gate drive (5V–10V) and OPTI-LOOP® ensure stable regulation across varying load transients and capacitor aging. |
| Multioutput Buck-Boost Converters | Always-On Telematics Units |
Use Scenario: Providing both step-down (5V/3A) and step-up (10V/2A) outputs from a single 12V input in network edge devices. IC Role / Device Role / Timing Role: Dual-buck-plus-boost topology controller with independent frequency and soft-start control per channel. Use Value: Phase-lockable 75kHz–850kHz operation enables synchronized switching to minimize conducted EMI in dense PCB layouts. | Use Scenario: Powering GPS, cellular modem, and MCU in vehicle telematics units that must remain operational during ignition-off periods. IC Role / Device Role / Timing Role: Low-IQ triple controller supplying always-on 3.3V (buck), 5V (buck), and backup 10V (boost) rails from Li-ion or supercapacitor. Use Value: 3.6µA shutdown current and 29µA sleep mode extend battery life for months without recharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3899IFE#PBF | Same functionality and pinout; rated for –40°C to +125°C junction vs. +150°C for H-grade. | Suitable for under-dash automotive or industrial enclosures without extreme thermal exposure. | Select when ambient temperatures remain below 105°C and cost sensitivity outweighs extended temperature margin. |
| LTC3899HUHF#PBF | Identical electrical specs and temperature rating; uses 5mm × 7mm QFN (UHF) package instead of TSSOP (FE). | Preferred for space-constrained designs requiring lower profile and better thermal dissipation (θJA = 34°C/W). | Choose for new designs prioritizing thermal performance and board area over legacy TSSOP compatibility. |
Compared with LTC3899IFE#PBF, the LTC3899HFE#PBF offers extended high-temperature operation essential for under-hood deployment; compared with LTC3899HUHF#PBF, it retains the mature TSSOP footprint for backward-compatible upgrades while delivering identical H-grade reliability.
Availability
LTC3899HFE#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial distributed power supplies, and always-on telematics units requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3899HFE#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous automotive qualification standards.
The LTC3899HFE#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding multi-rail power conversion in automotive, industrial, and telecom infrastructure where wide input range, low IQ, and robust thermal performance are mandatory.
FAQ
What is the maximum input voltage supported by the LTC3899HFE#PBF?
The LTC3899HFE#PBF supports an absolute maximum bias input supply voltage (VBIAS) of 65V, with guaranteed operation from 4.5V to 60V. It can operate down to 2.2V after startup when biased from the boost output or auxiliary supply - a key feature for automotive cold-crank resilience. This specification is validated across the full –40°C to +150°C junction temperature range for the H-grade device.
How does the LTC3899HFE#PBF achieve 29µA quiescent current?
The LTC3899HFE#PBF achieves 29µA sleep-mode quiescent current through integrated low-power circuitry, including optimized bias networks, clock gating, and selective shutdown of unused channels. This value is measured with one buck channel active and no load, under specified conditions (VDRVSET = 0V, VFB1,2 = 0.83V). The 3.6µA shutdown current occurs when all RUN pins are pulled below 0.7V.
Can the LTC3899HFE#PBF drive both logic-level and standard MOSFETs?
Yes, the LTC3899HFE#PBF supports both logic-level and standard MOSFETs via its programmable gate drive voltage. The DRVSET pin configures DRVCC from 5V (GND) to 10V (INTVCC), with intermediate values set using a 50kΩ–100kΩ resistor to GND. This flexibility allows optimization of RDS(on) and switching loss for diverse FET selections without external level shifters.
What is the purpose of the VPRG3 pin on the LTC3899HFE#PBF?
The VPRG3 pin on the LTC3899HFE#PBF selects the operating mode of the boost channel (Channel 3): floating enables adjustable output via external resistors and VFB3 (1.2V reference); grounding sets fixed 10V output; connecting to INTVCC sets fixed 12V output. This eliminates external configuration components for common boost voltages while retaining flexibility for custom regulation.
Does the LTC3899HFE#PBF require external bootstrap diodes for high-side gate drive?
No, the LTC3899HFE#PBF integrates internal switches in the top gate drivers that eliminate the need for external bootstrap diodes. This reduces component count, improves reliability, and simplifies layout - especially beneficial in high-density automotive and industrial power designs where board space and long-term field reliability are critical.
LTC3899HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Number of Outputs:
- 3
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 60V
- Frequency - Switching:
- 105kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3899HFE#PBF FAQ
1.How can I place an order for LTC3899HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899HFE#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 LTC3899HFE#PBF reliable?
The price and inventory of LTC3899HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3899HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899HFE#PBF?
LTC3899HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899HFE#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 LTC3899HFE#PBF?
For technical support, including LTC3899HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899HFE#PBF requirements.
6.How does Aetrix verify that LTC3899HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3899HFE#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 LTC3899HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3899HFE#PBF?
All LTC3899HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899HFE#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 LTC3899HFE#PBF part is unused and in its original packaging.
Return procedure for LTC3899HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3899HFE#PBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
