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Analog Devices Inc. LTC1625CGN#PBF
- Part No.:
- LTC1625CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1625CGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:758
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Product details
Overview
LTC1625CGN#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller that drives external N-channel MOSFETs without requiring a current-sense resistor. It operates from 3.7V to 36V input, delivers adjustable output from 1.19V to VIN, features ±1% 1.19V reference, 150kHz nominal oscillator, and Burst Mode™ operation for high efficiency in battery-powered systems such as notebook computers and wireless modems.
For engineers reviewing the LTC1625CGN#PBF datasheet, LTC1625CGN#PBF pinout, LTC1625CGN#PBF application, or LTC1625CGN#PBF equivalent, key selection considerations include MOSFET VDS sensing architecture, forced continuous mode control via FCB pin, programmable soft start, output overvoltage protection at 1.28V, and compatibility with narrow 16-lead SSOP packaging for space-constrained DC/DC designs.
Technical Context
The LTC1625CGN#PBF implements current-mode control using MOSFET VDS sensing instead of a discrete sense resistor-reducing power loss and component count. Its error amplifier adjusts ITH voltage (0–2.4V range) to regulate peak inductor current against a 1.19V internal reference, with load regulation of ±0.2% and line regulation of 0.01%/V.
It supports injection-lock synchronization over a 1.5:1 frequency range (100–225kHz), includes a dropout counter enabling 99% duty cycle operation, and integrates dual gate drivers (TG/BG) with 50–150ns transition times driving N-MOSFETs referenced to INTVCC (5.2V regulated output). Fault protection includes foldback current limiting and output overvoltage lockout at 1.28V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.7V to 36V - supports wide-input industrial and automotive battery systems without external pre-regulation. |
| Output Voltage Range | 1.19V to VIN - enables low-voltage logic rails and high-efficiency near-dropout operation. |
| Reference Accuracy | ±1% at 1.19V - ensures tight output regulation across temperature and line/load conditions. |
| Oscillator Frequency | 135–165kHz (typ. 150kHz) - balances switching loss vs. magnetics size; synchronizable up to 225kHz. |
| Shutdown Current | <30µA - extends battery life in portable applications during standby. |
| Max Sense Threshold | 150mV - sets peak current limit without external resistor; enables RDS(ON)-based current sensing. |
| Overvoltage Lockout | 1.24–1.32V - protects downstream circuitry from transient overshoot exceeding 5% of nominal 1.19V reference. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 0.15mm lead pitch, JEDEC MS-013AC compliant. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | INTVCC switch input | Enables high-efficiency external biasing above 4.7V; bypasses internal LDO to reduce power loss. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); forces 225kHz when >1.2V; enables EMI reduction via frequency dithering. |
| RUN/SS (3) | Run control & soft-start | Pull below 0.8V to shut down; capacitor to ground sets ramp time (~1s/µF) for controlled startup sequencing. |
| FCB (4) | Forced continuous mode control | Tie to ground to disable Burst Mode; enables secondary winding regulation in multi-output flyback-derived topologies. |
| ITH (5) | Error amplifier compensation node | 0–2.4V control voltage sets current comparator threshold; used for loop compensation and current limiting. |
| SGND (6) | Signal ground reference | Return path for feedback network; must be star-connected to COUT (–) to minimize noise coupling. |
| VOSENSE (7) | Output voltage feedback input | High-impedance (10nA max) sense node; accepts remote sensing or resistive divider for precision regulation. |
| VPROG (8) | Output voltage selection | Open = adjustable via VOSENSE divider; 0V = 3.3V; INTVCC = 5V - simplifies BOM by supporting multiple outputs with one controller. |
| VIN (16) | Main supply input | Primary power source for internal circuits and bootstrap charging; requires RC filter (4.7Ω + 0.1µF) above 3A. |
| TK (15) | Top MOSFET Kelvin sense | Separate trace to top MOSFET drain - eliminates PCB trace resistance error in VDS sensing path. |
| SW (14) | Switch node | Connects to inductor and bootstrap capacitor (–); swings from ~–0.7V to VIN - critical for layout EMI control. |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate with swing = INTVCC – diode drop, referenced to SW node - enables high-side synchronous rectification. |
| BOOST (12) | Bootstrap supply | Connects to (+) terminal of bootstrap capacitor; swings from INTVCC – 0.7V to VIN + INTVCC - sustains top gate drive during 99% duty cycle. |
| INTVCC (11) | Internal 5.2V regulator output | Power rail for drivers and analog circuitry; requires ≥4.7µF tantalum decoupling to PGND for stability. |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC - enables synchronous rectification with minimal conduction loss. |
| PGND (9) | Power ground | Return for bottom MOSFET source, CVCC (–), and CIN (–); must be low-inductance connection to minimize switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE architecture | Eliminates 5–10W sense resistor loss in high-current designs; uses MOSFET RDS(ON) as intrinsic current sensor. |
| Burst Mode™ operation | Reduces light-load quiescent current to <30µA while maintaining regulation - extends runtime in battery-powered PDAs and modems. |
| 99% duty cycle capability | Enables ultra-low dropout operation (e.g., 5.0V→4.95V at 4A), critical for Li-ion battery systems nearing end-of-discharge. |
| Programmable soft start | External CSS capacitor provides controlled inrush current limiting and supply sequencing - prevents input rail collapse in multi-rail systems. |
| Output overvoltage protection | Hardware-comparator-based shutdown at 1.28V prevents damage to 3.3V/5V logic ICs during transient events or feedback loop failure. |
Applications
| Notebook Power Management | Wireless Modem DC/DC Conversion |
|---|---|
Use Scenario: Regulating 3.3V/5V rails from 5–24V battery or adapter input in ultraportable notebooks with thermal constraints. IC Role / Device Role / Timing Role: Synchronous step-down controller managing external Si4410DY MOSFETs with MOSFET VDS current sensing. Use Value: Achieves >92% efficiency at 2A load and 10V input while eliminating sense resistor heat dissipation and PCB area. | Use Scenario: Generating stable 3.3V supply for RF transceivers and baseband processors in cellular data modems operating from 7.4V Li-Po packs. IC Role / Device Role / Timing Role: Current-mode controller with Burst Mode™ enabling <30µA shutdown current and fast transient response to bursty data traffic. Use Value: Extends modem standby time by 3× versus fixed-frequency controllers; maintains 1% output accuracy across –20°C to 60°C ambient. |
| Battery Charger Auxiliary Supply | Distributed Power System Controller |
Use Scenario: Providing isolated 5V auxiliary bias for charger ICs and status LEDs in multi-cell Li-ion battery chargers. IC Role / Device Role / Timing Role: Synchronous buck controller accepting wide 9–36V input from primary DC bus; configured for fixed 5V output via VPROG = INTVCC. Use Value: Delivers 3A continuous output with <100mV dropout at 9.5V input - avoids linear regulator inefficiency in thermally limited enclosures. | Use Scenario: Local point-of-load regulation in industrial PLC backplanes where 12V or 24V distributed bus powers multiple 3.3V/5V subsystems. IC Role / Device Role / Timing Role: High-reliability controller with SYNC pin enabling system-wide clock synchronization to reduce conducted EMI peaks. Use Value: Enables deterministic switching alignment across 8+ regulators on single board - reduces peak input current demand by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EGN#PBF | Higher 250kHz–750kHz frequency range; integrated gate drivers rated for 10A peak; no VDS sensing - requires external sense resistor. | Targets higher-power (>10A), higher-frequency designs where MOSFET conduction loss dominates over switching loss. | Select LTC3850EGN#PBF when designing >10A supplies with tight EMI requirements and available PCB area for sense resistor. |
| TPS40200DR | Fixed 300kHz frequency; external VREF input; no Burst Mode™; lower IQ (85µA) but no 99% duty cycle support. | Suitable for cost-sensitive industrial supplies where light-load efficiency is secondary to BOM simplicity. | Choose TPS40200DR when 3.3V/5V fixed output and basic current-mode control suffice without advanced low-power features. |
Compared with LTC1625CGN#PBF, LTC3850EGN#PBF trades MOSFET VDS sensing for higher-frequency operation and greater drive strength, while TPS40200DR offers lower cost and simpler layout at the expense of Burst Mode™ efficiency and dropout capability.
Availability
LTC1625CGN#PBF is available at Aetrix Electronics and suitable for notebook computing, wireless modem power management, and battery charger auxiliary supply applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1625CGN#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1625CGN#PBF belongs to Linear's legacy high-efficiency DC/DC controller family, designed specifically for synchronous step-down conversion in portable and battery-critical systems where sense-resistor elimination and Burst Mode™ efficiency are essential.
FAQ
What is the maximum input voltage rating for the LTC1625CGN#PBF?
The LTC1625CGN#PBF has an absolute maximum input voltage rating of 36V on the VIN and TK pins. Operation is specified from 3.7V to 36V, with the industrial-grade LTC1625IGN variant requiring minimum 3.9V at –40°C. Exceeding 36V risks permanent damage to internal ESD structures and gate oxides.
How does the LTC1625CGN#PBF achieve current sensing without a sense resistor?
The LTC1625CGN#PBF uses MOSFET VDS sensing: it monitors the voltage drop across the RDS(ON) of the conducting top or bottom N-channel MOSFET to derive peak inductor current. The TK pin provides Kelvin connection to the top MOSFET drain, and internal amplifiers select the appropriate VDS signal - eliminating external sense resistor losses and PCB area.
Can the LTC1625CGN#PBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC1625CGN#PBF supports injection-lock synchronization via the SYNC pin. It locks to external clocks between 100kHz and 225kHz - a 1.5:1 ratio around its nominal 150kHz oscillator. Clock high level must exceed 1.2V for 1–4µs; the top MOSFET turn-on aligns with the rising edge of the synchronized clock.
What is the purpose of the FCB pin on the LTC1625CGN#PBF, and how should it be configured?
The FCB (Forced Continuous Mode) pin on the LTC1625CGN#PBF disables Burst Mode™ operation when pulled below 1.19V. Tie to ground to force continuous switching at light loads - critical for maintaining regulation on secondary windings in multi-output converters or reducing output ripple in noise-sensitive applications.
Does the LTC1625CGN#PBF support adjustable output voltage, and how is it set?
Yes, the LTC1625CGN#PBF supports adjustable output voltage from 1.19V to VIN. When VPROG is left open, output is set by an external resistive divider between VOSENSE and the output. Fixed 3.3V or 5V outputs are selected by pulling VPROG to 0V or INTVCC respectively - enabling flexible BOM strategies without redesign.
LTC1625CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 3.7V ~ 36V
- Frequency - Switching:
- 150kHz
- Duty Cycle (Max):
- 99%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1625CGN#PBF FAQ
1.How can I place an order for LTC1625CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1625CGN#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 LTC1625CGN#PBF reliable?
The price and inventory of LTC1625CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1625CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1625CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1625CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1625CGN#PBF?
LTC1625CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1625CGN#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 LTC1625CGN#PBF?
For technical support, including LTC1625CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1625CGN#PBF requirements.
6.How does Aetrix verify that LTC1625CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1625CGN#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 LTC1625CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1625CGN#PBF?
All LTC1625CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1625CGN#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 LTC1625CGN#PBF part is unused and in its original packaging.
Return procedure for LTC1625CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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