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Analog Devices Inc. LTC1625CGN#TRPBF
- Part No.:
- LTC1625CGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1625CGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BOOST 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
LTC1625CGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller that drives external dual N-channel MOSFETs without a current-sense resistor, using MOSFET VDS sensing. It operates from 3.7V to 36V input, delivers 1.19V–VIN output, features ±1% 1.19V reference, 150kHz nominal oscillator, and 99% duty-cycle dropout capability - used in high-efficiency battery-powered DC/DC conversion.
For engineers reviewing the LTC1625CGN#TRPBF datasheet, LTC1625CGN#TRPBF pinout, LTC1625CGN#TRPBF application, or LTC1625CGN#TRPBF equivalent, key selection considerations include its no-RSENSE current-mode architecture, programmable fixed-frequency synchronization (100–225kHz), forced continuous mode control (FCB), Burst Mode™ operation for light-load efficiency, and 16-lead SSOP package with validated thermal resistance (θJA = 130°C/W).
Technical Context
The LTC1625CGN#TRPBF implements constant-frequency current-mode control via MOSFET VDS sensing on both top and bottom switches, eliminating external sense resistors and reducing conduction losses. Its error amplifier adjusts ITH voltage (0–2.4V range) to regulate peak inductor current against a precision 1.19V reference, with load regulation of ±0.2% and line regulation of 0.01%/V.
It integrates a 5.2V internal LDO (INTVCC) powered either from VIN or an external EXTVCC ≥4.7V, dual gate drivers (TG/BG) with 50–150ns transition times, and protection circuitry including foldback current limiting (150mV → 30mV threshold), output overvoltage lockout (1.28V), and dropout counter for bootstrap capacitor recharge at high duty cycles.
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 regulators. |
| Output Voltage Range | 1.19V to VIN - enables adjustable low-voltage rails (e.g., 1.2V, 1.8V, 3.3V, 5V) via VPROG pin selection or external divider. |
| Oscillator Frequency | 135–165kHz (nominal 150kHz), synchronizable 100–225kHz - allows EMI reduction via frequency dithering or system clock alignment. |
| Reference Accuracy | ±1% at 1.19V over temperature - ensures tight output regulation without trimming in portable power supplies. |
| Shutdown Current | <30µA - extends battery life in standby mode for notebook, PDA, and wireless modem applications. |
| Duty Cycle Limit | Up to 99% - maintains regulation down to VIN – VOUT < 100mV, critical for high-efficiency low-dropout operation. |
| Current Sense Threshold | 120–170mV (ΔVSENSE(MAX)) - sets peak inductor current limit based on MOSFET RDS(ON), enabling precise overcurrent protection. |
Pinout & Package
Package: 16-lead narrow SSOP (GN), 5.0mm × 6.2mm body, 0.635mm pitch, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EXTVCC (1) | External INTVCC supply input | Switches internal LDO off when ≥4.7V applied - enables high-efficiency self-powered operation from output rail. |
| SYNC (2) | Oscillator synchronization input | Accepts external clock (100–225kHz); >1.2V forces 225kHz, open/ground defaults to 150kHz - reduces EMI through frequency coordination. |
| RUN/SS (3) | Run enable & soft-start control | Pull <0.8V to shut down; capacitor to ground sets ramp time (~1s/µF) - enables controlled power-up sequencing and inrush current limiting. |
| FCB (4) | Forced continuous mode control | Tie to GND to disable Burst Mode™ and enforce continuous conduction - improves cross-regulation in multi-output flyback-derived designs. |
| ITH (5) | Error amplifier compensation node | 0–2.4V control voltage sets current comparator threshold - provides direct access for loop compensation and current limit adjustment. |
| SGND (6) | Signal ground reference | Return path for VOSENSE feedback network - must be connected to COUT negative terminal to avoid ground bounce errors. |
| VOSENSE (7) | Output voltage feedback input | High-impedance (10nA max) sense node - accepts remote sensing or resistive divider for accurate regulation independent of PCB trace IR drop. |
| VPROG (8) | Output voltage selection | 0V → 3.3V, INTVCC → 5V, open → adjustable - eliminates external resistor networks for common output voltages. |
| PGND (9) | Power ground return | Source connection for bottom MOSFET and CIN/CVCC negatives - requires low-inductance layout to minimize switching noise coupling. |
| BG (10) | Bottom gate driver output | Drives bottom N-MOSFET gate between PGND and INTVCC - supports logic-level MOSFETs with <5.2V VGS requirement. |
| INTVCC (11) | Internal 5.2V regulator output | Supplies gate drivers and core logic; decoupled with ≥4.7µF tantalum - critical for stable high-side drive during bootstrap recharge. |
| BOOST (12) | Bootstrap capacitor positive terminal | Swings from ~4.5V to VIN+5.2V - powers top gate driver; requires low-ESR ceramic capacitor (0.22µF typical). |
| TG (13) | Top gate driver output | Drives top N-MOSFET gate referenced to SW node - swing equals INTVCC minus diode drop, enabling high-side N-MOSFET control. |
| SW (14) | Switch node | Connects to MOSFET drains and bootstrap cap negative - high dv/dt node requiring minimized loop area to reduce EMI. |
| TK (15) | Top MOSFET Kelvin sense | Direct drain connection for VDS sensing - must be routed separately from VIN to eliminate PCB trace resistance error in current measurement. |
| VIN (16) | Main input supply | 3.7–36V input; RC filter (4.7Ω + 0.1µF) recommended above 3A - filters high-frequency switching noise before internal regulator. |
Key Features
| Feature | Design Value |
|---|---|
| No external current-sense resistor | Uses MOSFET RDS(ON) as current-sense element - eliminates 5–15W sense resistor losses and board space in high-current designs. |
| Programmable fixed-frequency operation | 150kHz nominal with ±15kHz tolerance and 1.5:1 sync range - enables deterministic EMI filtering and avoids sensitive frequency bands in communication systems. |
| Forced continuous mode control (FCB) | Pin-selectable disable of Burst Mode™ - ensures stable secondary winding regulation in multi-output converters without auxiliary controllers. |
| 99% maximum duty cycle | Enables ultra-low dropout operation down to VIN – VOUT < 100mV - extends runtime in Li-ion battery systems discharging to 3.0V while maintaining 3.3V output. |
| Logic-controlled micropower shutdown | IQ < 30µA with VRUN/SS = 0V - reduces quiescent consumption by >95% vs active mode, critical for always-on IoT sensor nodes. |
| Output overvoltage protection | 1.28V lockout threshold with fast comparator response - prevents damage to downstream 3.3V/5V logic during transient faults or startup overshoot. |
Applications
| Portable Computing Power | Wireless Modem DC/DC |
|---|---|
Use Scenario: Step-down conversion from 5–28V battery or adapter input to stable 3.3V/5V for CPU core, memory, and I/O rails in notebooks and PDAs. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing up to 4.5A output with no-RSENSE efficiency optimization and soft-start sequencing. Use Value: Achieves >90% efficiency at 2A load (VIN=10V→VOUT=3.3V), extending battery life while minimizing thermal footprint in space-constrained chassis. | Use Scenario: Compact, high-reliability power stage for LTE/Wi-Fi modems operating from 12V vehicle or PoE sources. IC Role / Device Role / Timing Role: Current-mode controller driving Si4410DY MOSFETs with synchronized 150kHz switching to meet conducted EMI limits. Use Value: Burst Mode™ reduces no-load IQ to <30µA, enabling always-on connectivity; FCB pin ensures stable USB interface voltage under variable RF load conditions. |
| Battery Charger Auxiliary Supply | Distributed Power System |
Use Scenario: Generating isolated 5V bias rail for charger ICs and status LEDs from main charging bus (5–24V). IC Role / Device Role / Timing Role: Secondary buck controller with programmable soft-start (CSS) to prevent inrush into capacitive LED loads during charge initiation. Use Value: RUN/SS pin capacitor sets controlled ramp time (~1ms/µF), eliminating voltage droop on shared input bus during simultaneous charger activation. | Use Scenario: Point-of-load regulation in industrial backplanes where 24V/48V distribution rails feed multiple 3.3V/5V subsystems. IC Role / Device Role / Timing Role: Synchronous step-down controller with EXTVCC self-powering from local output to improve overall system efficiency. Use Value: Using VOUT to power INTVCC bypasses internal LDO losses, raising full-load efficiency by 1–2% versus VIN-fed configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#TRPBF | Integrated power MOSFETs (42V IN, 3.5A), 2MHz switching, Silent Switcher® architecture | Higher integration, lower EMI, but fixed 3.3V/5V outputs; no VPROG pin flexibility | Select LT8610EMSE#TRPBF when board space and EMI are critical, and output voltage is fixed; LTC1625CGN#TRPBF preferred for adjustable outputs and external MOSFET optimization. |
| TPS54202DDCR | Integrated 30V/2A MOSFETs, 400kHz–2.5MHz sync, no VDS sensing - uses external sense resistor | Lower BOM count, but adds sense resistor loss and layout complexity; lacks 99% duty cycle | Select TPS54202DDCR for cost-sensitive, medium-current applications where efficiency >90% at light load is not required; LTC1625CGN#TRPBF retains advantage in ultra-low dropout and no-RSENSE designs. |
Compared with LT8610EMSE#TRPBF and TPS54202DDCR, the LTC1625CGN#TRPBF uniquely combines external MOSFET flexibility, no-RSENSE operation, 99% duty cycle, and pin-selectable output voltages - making it optimal for high-efficiency, high-current, and thermally constrained portable power designs where component-level optimization matters.
Availability
LTC1625CGN#TRPBF is available at Aetrix Electronics and suitable for notebook computing power, wireless modem DC/DC conversion, and battery charger auxiliary supply applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1625CGN#TRPBF 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 product lines with rigorous qualification and long-term support.
The LTC1625CGN#TRPBF belongs to Linear's legacy high-efficiency current-mode controller family, designed specifically for synchronous step-down regulation in battery-powered and distributed power systems where no-RSENSE operation and ultra-low dropout are essential.
FAQ
What is the maximum input voltage rating for the LTC1625CGN#TRPBF?
The LTC1625CGN#TRPBF has an absolute maximum input supply voltage (VIN, TK) of 36V, with recommended operating range from 3.7V to 36V. Exceeding 36V risks permanent damage to internal circuitry, especially the gate drivers and INTVCC regulator. The BOOST pin tolerates up to 42V, but this is only during normal switching operation - sustained overvoltage on VIN remains limited to 36V per Absolute Maximum Ratings.
How does the LTC1625CGN#TRPBF achieve current sensing without a sense resistor?
The LTC1625CGN#TRPBF uses MOSFET VDS sensing on both top and bottom N-channel MOSFETs to derive current information. It monitors the voltage drop across the conducting MOSFET's RDS(ON) via dedicated pins (TK for top, PGND for bottom), eliminating external sense resistors. This method reduces conduction losses and board area, and the LTC1625CGN#TRPBF's current comparator threshold is calibrated to 120–170mV to accommodate RDS(ON) variation across temperature and process.
Can the LTC1625CGN#TRPBF operate with a 3.3V input supply?
No - the LTC1625CGN#TRPBF has a minimum operating input voltage of 3.7V. At temperatures below 0°C, the effective minimum may rise further; the industrial-grade LTC1625IGN specifies 3.9V minimum at –40°C. Attempting operation at 3.3V will prevent proper startup of the internal 5.2V LDO (INTVCC) and cause erratic gate drive or complete failure to switch. For sub-3.7V inputs, consider the LTC3630 or LTC3642 families.
What is the purpose of the FCB pin on the LTC1625CGN#TRPBF?
The FCB (Forced Continuous Mode) pin on the LTC1625CGN#TRPBF disables Burst Mode™ operation when pulled below 1.19V, forcing continuous conduction regardless of load current. This is essential for maintaining cross-regulation in multi-output flyback-derived supplies and preventing audible noise in light-load conditions. When tied to INTVCC, Burst Mode™ resumes - giving designers direct control over efficiency vs. regulation trade-offs in the LTC1625CGN#TRPBF.
Does the LTC1625CGN#TRPBF support external synchronization, and what is its frequency range?
Yes, the LTC1625CGN#TRPBF supports external synchronization via the SYNC pin, locking to input clocks from 100kHz to 225kHz - a 1.5:1 ratio around its nominal 150kHz oscillator. The SYNC pin threshold is 0.9–1.2V (rising), and the clock high pulse must be 1–4µs wide. This allows EMI reduction through frequency spreading or alignment with system clocks, and the LTC1625CGN#TRPBF maintains tight regulation even during injection locking.
LTC1625CGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1625CGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1625CGN#TRPBF 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#TRPBF reliable?
The price and inventory of LTC1625CGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1625CGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1625CGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1625CGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1625CGN#TRPBF?
LTC1625CGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1625CGN#TRPBF 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#TRPBF?
For technical support, including LTC1625CGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1625CGN#TRPBF requirements.
6.How does Aetrix verify that LTC1625CGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1625CGN#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1625CGN#TRPBF?
All LTC1625CGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1625CGN#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC1625CGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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