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Analog Devices Inc. LTC1624CS8#PBF
- Part No.:
- LTC1624CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1624CS8#PBF.pdf
- Description:
- IC REG CTRLR BCK/BST/SEPIC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:218
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Product details
Overview
LTC1624CS8#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 output voltages from 1.19V to 30V, features ±1% 1.19V reference, 200kHz fixed frequency, and 95% maximum duty cycle for low-dropout operation - used in battery-powered DC-DC conversion for portable computing and wireless infrastructure.
For engineers reviewing the LTC1624CS8#PBF datasheet, LTC1624CS8#PBF pinout, LTC1624CS8#PBF application, or LTC1624CS8#PBF equivalent, key selection criteria include its external MOSFET drive capability, ITH/RUN dual-function pin for shutdown/compensation, SENSE– current-sense interface, BOOST bootstrap supply architecture, and SO-8 thermal performance under continuous 2A load conditions.
Technical Context
The LTC1624CS8#PBF implements a fixed-frequency (200kHz) current-mode control loop with internal oscillator, error amplifier, and dual comparators (I1 for peak current limit, B for Burst Mode entry). Its ITH/RUN pin serves as both compensation node and logic-controlled shutdown input, with 0.8V threshold for disabling all switching functions and 2.5µA internal pull-up for soft-start ramping.
It integrates a floating high-side gate driver powered by a bootstrap capacitor (CB), with TG output capable of 2A peak current and 50–150ns transition times. The device supports remote voltage sensing via VFB and includes built-in overvoltage lockout (1.24–1.32V) and dropout detection to maintain CB charge during high-duty-cycle operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 200kHz fixed - enables compact magnetics and predictable EMI profile without external timing components. |
| Input Voltage Range | 3.5V to 36V - supports wide-range industrial and automotive battery inputs, including 12V and 24V systems. |
| Reference Voltage | 1.19V ±1% - sets precise output regulation point; used with external resistor divider to program VOUT from 1.19V to 30V. |
| Max Duty Cycle | 95% - extends battery runtime in low-VIN conditions by minimizing dropout voltage across the external MOSFET. |
| Shutdown Current | 16–30µA - enables micropower standby in portable devices; activated by pulling ITH/RUN below 0.8V. |
| Current Sense Threshold | 145–185mV - defines peak inductor current limit; sets maximum output current in conjunction with RSENSE value. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for notebook, PDA, and telecom equipment ambient environments. |
Pinout & Package
Package: 8-Lead Plastic SO (SO-8), surface-mount, θJA = 110°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (1) | Current comparator negative input | Connects to low-side of RSENSE; senses voltage drop across sense resistor to regulate peak inductor current. |
| ITH/RUN (2) | Error amplifier output / shutdown control | Combines loop compensation (via CC/RC) and logic-level shutdown; 0.8V threshold disables switching and pulls TG low. |
| VFB (3) | Feedback input | Receives divided output voltage; compared to 1.19V reference to adjust ITH/RUN and maintain regulation. |
| GND (4) | Analog and power ground | Common return for COUT, CIN, and Schottky cathode; must be low-impedance connection to minimize noise coupling. |
| SW (5) | Switch node | Connects to inductor and external Schottky anode; swings from near ground to VIN in step-down configuration. |
| TG (6) | Top-gate driver output | Drives external N-channel MOSFET gate; floating output referenced to SW, capable of 2A peak current. |
| BOOST (7) | Bootstrap supply | Connects to CB capacitor; supplies gate drive voltage for TG; rises to VIN + INTVCC (~5V) during MOSFET off-time. |
| VIN (8) | Main power input | Supplies internal regulators and gate drivers; requires local 22µF/35V ceramic or low-ESR electrolytic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Enables high efficiency at light loads (<100mA) by disabling switching until ITH/RUN exceeds 1.5V, reducing quiescent power. |
| Internal bootstrapped gate drive | Eliminates need for isolated bias supply; integrated high-voltage diode recharges CB during each SW low phase. |
| Remote output voltage sensing | Compensates for PCB trace IR drop using VFB feedback path; improves regulation accuracy at load point. |
| Logic-compatible shutdown | Direct TTL/CMOS interfacing via ITH/RUN pin; no external level-shifting required for enable/disable control. |
| Overvoltage lockout (OV) | Disables top switch if VFB exceeds 1.24–1.32V, preventing transient overshoot damage to downstream circuitry. |
Applications
| Portable Computing Power | Wireless Modem DC-DC |
|---|---|
Use Scenario: Step-down conversion from single-cell Li-ion (4.2V) or dual-cell (8.4V) battery to 3.3V/5V for CPU, memory, and I/O rails in notebooks and PDAs. IC Role / Device Role / Timing Role: Controller IC managing external N-MOSFET and Schottky diode; regulates output via current-mode feedback and 200kHz PWM timing. Use Value: 95% duty cycle extends usable battery voltage range down to ~3.5V input, increasing runtime before low-battery cutoff. |
Use Scenario: Efficient 12V-to-5V or 24V-to-3.3V conversion in cellular baseband modules and LTE/Wi-Fi modems requiring stable low-noise supply. IC Role / Device Role / Timing Role: Fixed-frequency current-mode controller enabling fast load transient response and minimal output ripple under bursty data traffic. Use Value: ±1% reference and remote sensing ensure <±2% output accuracy across temperature and board layout variations. |
| Battery Charger Auxiliary Supply | Industrial DC Distribution |
Use Scenario: Generating isolated auxiliary rails (e.g., 12V → 5V/3.3V) within multi-chemistry battery chargers for microcontroller, display, and communication ICs. IC Role / Device Role / Timing Role: Step-down controller driving discrete MOSFET; uses ITH/RUN for sequencing with main charging controller. Use Value: Micropower shutdown (≤30µA) eliminates standby drain when charger is unpowered or in maintenance mode. |
Use Scenario: Point-of-load regulation in 24V/36V industrial DC distribution systems powering sensors, PLC I/O, and fieldbus interfaces. IC Role / Device Role / Timing Role: High-input-voltage controller supporting up to 36V VIN; implements SEPIC topology for non-inverting buck-boost where input may dip below output. Use Value: Wide 3.5–36V input range accommodates brownout and surge conditions without external pre-regulator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5116PW | Wide-input synchronous buck controller (4.5–100V); integrates high-side FET driver but requires external bootstrap diode; no Burst Mode. | Higher VIN max and synchronous rectification improve efficiency above 24V input; less suitable for sub-5V output due to minimum on-time limitation. | Choose LM5116PW for >40V input or when synchronous operation is mandatory; LTC1624CS8#PBF preferred for cost-sensitive, low-IQ, or 3.5–24V battery systems. |
| TPS40200DR | Adjustable-frequency (50–1000kHz) current-mode controller; 4.5–52V input; no integrated bootstrap diode; higher IQ (2.5mA typical). | Frequency programmability aids EMI tuning; higher quiescent current limits use in ultra-low-power battery apps; lacks OV lockout. | Choose TPS40200DR when frequency agility or higher VIN is needed; LTC1624CS8#PBF offers better light-load efficiency and tighter reference for precision outputs. |
Compared with LM5116PW and TPS40200DR, the LTC1624CS8#PBF provides superior micropower shutdown (≤30µA), integrated bootstrap diode, and Burst Mode™ for extended battery life - making it optimal for portable, low-VIN, and cost-constrained designs where 200kHz fixed frequency is acceptable.
Availability
LTC1624CS8#PBF is available at Aetrix Electronics and suitable for notebook computers, wireless modems, and battery-charged portable electronics requiring stable component supply with full commercial temperature support (0°C to 70°C).
Supply support for LTC1624CS8#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 analog power portfolio, emphasizing high-performance, low-noise, and energy-efficient signal conditioning and power management ICs.
The LTC1624CS8#PBF belongs to Linear's legacy current-mode controller family designed specifically for flexible, discrete-MOSFET-based DC-DC conversion in space- and power-constrained portable and telecom applications.
FAQ
What is the maximum input voltage rating for the LTC1624CS8#PBF?
The LTC1624CS8#PBF has an absolute maximum input supply voltage (VIN) rating of 36V. Operation beyond this risks permanent damage. The recommended operating range is 3.5V to 36V, with guaranteed performance across that span per the Electrical Characteristics table at TA = 25°C and full 0°C to 70°C commercial temperature range.
Can the LTC1624CS8#PBF drive a synchronous rectifier instead of a Schottky diode?
No, the LTC1624CS8#PBF does not support synchronous rectification. It provides only a single high-side gate driver (TG) and relies on an external Schottky diode for the low-side path. Its functional diagram and Applications Information explicitly specify D1 as a Schottky diode; no complementary low-side driver or timing control for synchronous FETs is included.
How does the ITH/RUN pin function in soft-start implementation for the LTC1624CS8#PBF?
The ITH/RUN pin enables soft-start by accepting an externally ramped voltage (e.g., via RC network). As the voltage rises from 1.19V to 2.4V, the internal peak current limit increases linearly from ~10mV/RSENSE to 160mV/RSENSE, gradually ramping output current and limiting inrush into COUT. This prevents input voltage sag and ensures controlled startup without oscillation.
What is the purpose of the SENSE– pin on the LTC1624CS8#PBF, and how is it connected?
The SENSE– pin is the inverting input of the current comparator and connects directly to the low-side terminal of the external current-sense resistor (RSENSE). It measures the voltage drop across RSENSE to regulate peak inductor current. The datasheet warns against pulling SENSE– more than 15V below VIN or below ground by >0.3V to avoid damaging the internal comparator input stage.
Does the LTC1624CS8#PBF include overtemperature protection?
The LTC1624CS8#PBF does not include internal thermal shutdown circuitry. Protection relies on external design: junction temperature must be kept ≤125°C using the thermal resistance θJA = 110°C/W and proper PCB copper area. The datasheet provides TJ calculation formula (TJ = TA + PD × 110°C/W) and recommends verifying worst-case power dissipation under max VIN and IOUT conditions.
LTC1624CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1624CS8#PBF FAQ
1.How can I place an order for LTC1624CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1624CS8#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 LTC1624CS8#PBF reliable?
The price and inventory of LTC1624CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1624CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1624CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1624CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1624CS8#PBF?
LTC1624CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1624CS8#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 LTC1624CS8#PBF?
For technical support, including LTC1624CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1624CS8#PBF requirements.
6.How does Aetrix verify that LTC1624CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1624CS8#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 LTC1624CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1624CS8#PBF?
All LTC1624CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1624CS8#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 LTC1624CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1624CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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