My Inquiry
My Account
Analog Devices Inc. LTC1624IS8#PBF
- Part No.:
- LTC1624IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1624IS8#PBF.pdf
- Description:
- IC REG CTRLR BCK/BST/SEPIC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:529
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1624IS8#PBF from Analog Devices (formerly Linear Technology) is a current-mode switching regulator controller that drives an external N-channel MOSFET in boost, step-down, SEPIC, and inverting topologies. It operates from 3.5V to 36V input, delivers up to 30V output in step-down mode, features ±1% 1.19V reference, 200kHz fixed frequency, and 95% maximum duty cycle for low-dropout operation-enabling extended battery runtime in portable power systems.
For engineers reviewing the LTC1624IS8#PBF datasheet, LTC1624IS8#PBF pinout, LTC1624IS8#PBF application, or LTC1624IS8#PBF equivalent, key selection considerations include its ITH/RUN dual-function pin for shutdown/compensation, remote voltage sensing capability, internal bootstrap diode, and thermal rating of –40°C to 85°C for industrial-grade reliability.
Technical Context
The LTC1624IS8#PBF implements a constant-frequency current-mode control architecture with an internal 200kHz oscillator, error amplifier, and peak-current comparator. Its ITH/RUN pin serves as both compensation node and logic-controlled shutdown input, with active threshold at 0.8V and clamping at 1.19V–2.4V for soft-start sequencing.
It integrates a floating high-side gate driver (TG) powered via BOOST pin, supports bootstrapped N-MOSFET drive with internal 5.15V INTVCC regulator, and includes dropout detection, overvoltage lockout (1.24–1.32V), and Burst Mode™ operation for high efficiency at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide-input industrial and battery-powered systems including 12V/24V rails and multi-cell Li-ion packs. |
| Output Voltage Range (Step-Down) | 1.19V to 30V - programmable via external resistor divider; enables precise regulation across logic, analog, and interface supplies. |
| Reference Voltage | 1.19V ±1% - high-accuracy feedback reference ensures stable output under line/load transients. |
| Switching Frequency | 200kHz (±25kHz) - fixed internal oscillator allows predictable EMI filtering and compact magnetics design. |
| Max Duty Cycle | 95% - enables ultra-low dropout operation, critical for maintaining regulation near battery end-of-discharge. |
| Shutdown Current | 16µA to 30µA - micropower shutdown extends standby time in always-on portable devices. |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments without derating. |
Pinout & Package
Package: 8-Lead Plastic SO (SO-8), surface-mount, JEDEC MS-012AC compliant, θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (1) | Current sense comparator negative input | Connects to low-side of RSENSE; sets peak inductor current limit with built-in offset relative to VIN. |
| ITH/RUN (2) | Error amplifier output / shutdown control | Dual-function pin: 0.8V threshold triggers shutdown; 1.19V–2.4V range controls current limit and enables soft-start via external RC. |
| VFB (3) | Feedback voltage input | Monitors resistive divider output; servoed to 1.19V reference for precise output regulation and remote sensing support. |
| GND (4) | Analog and power ground reference | Common return for COUT, CIN, and Schottky cathode; must be low-impedance for stability and noise immunity. |
| SW (5) | Switch node connection | Drives inductor in step-down; swings from ~0.4V below GND (diode drop) to VIN during operation. |
| TG (6) | High-current gate driver output | Drives N-MOSFET gate with 2A peak current; voltage swing equals INTVCC superimposed on SW node. |
| BOOST (7) | Floating driver supply | Receives charge from internal bootstrap diode; supplies TG driver; voltage = INTVCC + SW in step-down mode. |
| VIN (8) | Main power input | Supplies internal regulators and logic; requires local 22µF/35V ceramic or electrolytic bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Provides inherent cycle-by-cycle current limiting and excellent transient response to load steps without external compensation. |
| Burst Mode™ operation | Enables >85% efficiency at 1mA load by disabling switching until ITH/RUN rises above 1.5V-ideal for battery-backed standby circuits. |
| Remote output voltage sensing | Compensates for PCB trace IR drop using VFB and dedicated sense lines, ensuring accurate regulation at point-of-load. |
| Internal bootstrap diode | Eliminates need for external diode between VIN and BOOST, simplifying layout and reducing BOM count in step-down designs. |
| Logic-compatible shutdown | ITH/RUN pin accepts standard CMOS/TTL logic levels (0V = shutdown, >0.8V = active), enabling direct microcontroller control. |
Applications
| Portable DC-DC Conversion | Industrial Power Distribution |
|---|---|
Use Scenario: Step-down conversion from 12V or 24V bus to 3.3V/5V for embedded controllers in handheld test equipment. IC Role / Device Role / Timing Role: Controller IC managing external N-MOSFET and Schottky diode to regulate output with remote sensing and thermal robustness. Use Value: 95% duty cycle maintains regulation down to 3.6V input, extending usable battery life in field-deployable instruments. | Use Scenario: Boost converter generating 24V from 12V supply for solenoid drivers in factory automation PLC modules. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller driving high-current N-MOSFET with programmable current limit and overvoltage protection. Use Value: ±1% reference and 200kHz switching enable stable, low-noise 24V rail with minimal output capacitor footprint. |
| Battery Charger Interface | Wireless Modem Power |
Use Scenario: SEPIC topology providing isolated, bidirectional voltage translation between Li-ion pack and USB-C PD negotiation circuitry. IC Role / Device Role / Timing Role: Controller supporting non-inverting buck-boost operation with adjustable current limit and soft-start sequencing. Use Value: ITH/RUN pin enables synchronized start-up with charging ICs, preventing inrush into partially charged batteries. | Use Scenario: Inverting regulator generating –5V from 3.3V rail for RF front-end bias in cellular IoT modules. IC Role / Device Role / Timing Role: Negative-output switching controller with internal bootstrap and low-quiescent shutdown for intermittent transmit bursts. Use Value: 16µA shutdown current minimizes leakage drain during deep-sleep modes, preserving multi-week battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3863EDD#PBF | Higher 300kHz–2MHz programmable frequency; integrated MOSFET drivers; no internal bootstrap diode; requires external gate drivers for N-MOSFET. | Targets higher-efficiency, higher-density synchronous buck designs; lacks native SEPIC/inverting support. | Select when synchronous rectification and tighter frequency control are required; not drop-in due to different pinout and driver architecture. |
| LM5116MH/NOPB | Wider 6V–100V input range; external clock sync; no internal reference clamp; requires external 1.215V reference; higher 1.5A gate drive. | Designed for high-voltage industrial and automotive DC-DC; no Burst Mode; less suitable for sub-10mA light-load efficiency. | Prefer for >40V input applications where LTC1624IS8#PBF's 36V max would be exceeded; verify thermal margin at full load. |
Compared with LTC3863EDD#PBF and LM5116MH/NOPB, the LTC1624IS8#PBF offers unique integration of SEPIC/inverting support, internal bootstrap diode, and Burst Mode™ for ultra-low-IQ operation-making it optimal for cost-sensitive, battery-constrained designs requiring flexible topology selection.
Availability
LTC1624IS8#PBF is available at Aetrix Electronics and suitable for portable computing, wireless modems, and battery-charged digital devices requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC1624IS8#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 legacy of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LTC1624IS8#PBF belongs to Linear's precision switching controller family, designed specifically for flexible, efficient DC-DC conversion in space- and power-constrained portable and industrial systems.
FAQ
What is the maximum input voltage rating for the LTC1624IS8#PBF?
The absolute maximum input voltage (VIN) for the LTC1624IS8#PBF is 36V. Operation beyond this risks permanent damage. The device is rated for continuous operation from 3.5V to 36V, with recommended derating above 30V in high-temperature environments. Always observe the differential voltage limit between BOOST and SW pins (≤7.8V) when designing bootstrapped topologies.
Does the LTC1624IS8#PBF support synchronous rectification?
No, the LTC1624IS8#PBF does not support synchronous rectification. It drives only a single external N-channel MOSFET (high-side switch) and relies on an external Schottky diode for the low-side path. The internal bottom MOSFET mentioned in the datasheet is a brief (~400ns) bootstrap recharge switch-not a synchronous rectifier. For synchronous buck designs, consider alternatives like the LTC3863EDD#PBF.
How is the output voltage programmed on the LTC1624IS8#PBF?
The output voltage of the LTC1624IS8#PBF is set using a two-resistor divider from VOUT to GND, connected to the VFB pin. The formula is VOUT = 1.19V × (1 + R1/R2). For example, R1 = 20kΩ and R2 = 35.7kΩ yields 3.3V. Remote sensing is supported by routing the divider directly from the load, with a 100Ω resistor added between L1 and R2 to prevent runaway if the sense line opens.
What is the purpose of the ITH/RUN pin on the LTC1624IS8#PBF?
The ITH/RUN pin on the LTC1624IS8#PBF serves three functions: (1) error amplifier output for loop compensation (via external RC network), (2) shutdown control (pull below 0.8V to disable), and (3) soft-start initiation (ramp from 1.19V to 2.4V). Its voltage directly sets the peak current limit: IL(PEAK) ≈ (VITH/RUN − 1.3V)/(6.8 × RSENSE). This pin enables precise sequencing and fault recovery without external logic.
Can the LTC1624IS8#PBF operate in SEPIC or inverting configurations?
Yes, the LTC1624IS8#PBF explicitly supports SEPIC and inverting (buck-boost) topologies per its datasheet. Its current-mode architecture and floating TG/BOOST structure allow reconfiguration of external components-such as swapping inductor placement and diode orientation-without changing the IC. Figure 1 shows step-down, but Figures in the Applications Information section confirm validated SEPIC and inverting schematics using the same LTC1624IS8#PBF.
LTC1624IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.5V ~ 36V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1624IS8#PBF FAQ
1.How can I place an order for LTC1624IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1624IS8#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 LTC1624IS8#PBF reliable?
The price and inventory of LTC1624IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1624IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1624IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1624IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1624IS8#PBF?
LTC1624IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1624IS8#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 LTC1624IS8#PBF?
For technical support, including LTC1624IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1624IS8#PBF requirements.
6.How does Aetrix verify that LTC1624IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1624IS8#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 LTC1624IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1624IS8#PBF?
All LTC1624IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1624IS8#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 LTC1624IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1624IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1624IS8#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…
