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Analog Devices Inc. LTC1735CGN#PBF
- Part No.:
- LTC1735CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC1735CGN#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
LTC1735CGN#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller driving external N-channel MOSFETs in fixed-frequency current-mode operation. It delivers 0.8V to 6V output at up to 9A, supports 4V–30V input, features ±1% output voltage accuracy, OPTI-LOOP™ compensation, and Burst Mode™ for high efficiency at light loads. It is used in notebook DC/DC power rails requiring precise low-voltage regulation.
For engineers reviewing the LTC1735CGN#PBF datasheet, LTC1735CGN#PBF pinout, LTC1735CGN#PBF application, or LTC1735CGN#PBF equivalent, key selection considerations include its programmable 265–335 kHz oscillator frequency (via COSC), forced continuous mode control (FCB pin), remote sense capability, foldback current limiting, and compatibility with 16-lead narrow SSOP packaging.
Technical Context
The LTC1735CGN#PBF implements a constant-frequency, current-mode control architecture with dual N-channel gate drivers (TG, BG), internal 0.8V reference, and transconductance error amplifier (gm = 1.3 mmho). Its OPTI-LOOP™ compensation allows stable loop response across wide output capacitance and ESR ranges.
Burst Mode™ operation disables switching when ITH falls below 0.5V, reducing quiescent current to <25 µA in shutdown; forced continuous mode (via FCB pin <0.84 V) eliminates mode transitions for low-noise applications. Protection includes internal foldback current limiting, output overvoltage crowbar (0.84–0.88 V trip), and latched short-circuit shutdown with defeat option.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 30V operating, 36V absolute max - supports wide industrial and computing input rails. |
| Output Voltage Range | 0.8V to 6V - programmable via external resistor divider; compatible with sub-1V microprocessor cores. |
| Reference Accuracy | ±1% (0.792V–0.808V) over temperature - ensures tight output regulation without trimming. |
| Oscillator Frequency | 265–335 kHz (COSC = 43 pF) - externally programmable and synchronizable up to 500 kHz. |
| Shutdown Current | <25 µA - enables micropower hold mode for battery-backed systems. |
| Duty Cycle Max | 98–99.4% - supports ultra-low dropout operation down to VIN − VOUT ≈ 100 mV at full load. |
| Current Sense Threshold | 60–85 mV - sets peak inductor current limit; foldback activated below 70% nominal VOUT. |
Pinout & Package
Package: 16-lead narrow plastic SSOP (GN), 5.0 mm × 6.2 mm, 0.65 mm pitch, exposed pad not present. Thermal resistance θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COSC | Oscillator timing capacitor connection | Sets switching frequency; 43 pF yields ~300 kHz; supports synchronization when driven externally. |
| RUN/SS | Run enable and soft-start control | Start threshold 1.0–1.9 V; internal 1.2 µA charge current; CSS capacitor sets ramp time (~1.25 s/µF). |
| ITH | Error amplifier output / current comparator threshold | Voltage-controlled peak current limit (0–2.4 V range); determines load transient response and stability margin. |
| FCB | Forced continuous/synchronization input | Ground = forced continuous; INTVCC = Burst Mode™; external clock = sync + cycle-skipping. |
| SGND | Small-signal ground reference | Single-point tie for feedback divider, COSC, CSS, and compensation network to minimize noise coupling. |
| VOSENSE | Feedback voltage input | Receives divided output voltage; precision 0.8 V reference enables accurate regulation with remote sensing. |
| SENSE− / SENSE+ | Current sense differential inputs | Measure RSENSE voltage drop; built-in offset sets trip point; common-mode range up to 1.1×INTVCC. |
| TG / BG | Top/bottom N-MOSFET gate drivers | 3 A peak drive capability; TG is floating (boost-referenced); BG is ground-referenced; 50–90 ns transition times. |
| SW | Switch node | Connects to inductor and bootstrap capacitor; voltage swings from −0.4 V (Schottky drop) to VIN. |
| VIN | Main power input | 4–30 V supply; requires local 22 µF/50 V ceramic + bulk decoupling; UVLO trips at 3.5–3.9 V. |
| INTVCC | Internal 5.2 V LDO output | Powers control circuitry and drivers; regulated from VIN or EXTVCC (if >4.7 V); requires 1 µF ceramic + 4.7 µF tantalum. |
| PGND | Power ground | Return path for bottom MOSFET source, CIN (−), and Schottky anode; separate from SGND to avoid noise injection. |
| BOOST | Floating driver supply | Connected to bootstrap capacitor; voltage swing = INTVCC superimposed on SW node (up to VIN + INTVCC). |
| EXTVCC | External VCC input | Optional 4.5–7 V supply to bypass INTVCC LDO; improves gate drive strength and efficiency at high VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Reduces no-load IQ to <25 µA while maintaining ±1% regulation - extends battery life in portable systems. |
| OPTI-LOOP™ compensation | Enables stable loop response with 10 µF–1000 µF output capacitors and ESR from 1 mΩ–100 mΩ - simplifies output filter design. |
| Forced continuous mode (FCB) | Eliminates mode transitions and associated audible noise - critical for EMI-sensitive audio or RF subsystems. |
| Remote output voltage sensing | Compensates for IR drop in PCB traces and connectors - maintains ±1% accuracy at load point, not IC pins. |
| Programmable soft-start (RUN/SS) | Controls inrush current via external CSS capacitor - prevents input rail sag and enables power sequencing. |
| Internal foldback current limiting | Reduces peak inductor current to ~25% of max when VOUT drops below 70% - protects MOSFETs during overload. |
Applications
| High-Efficiency Notebook CPU Core Supply | Wireless Baseband Power Management |
|---|---|
Use Scenario: Regulating 1.2 V/6 A core voltage for Intel Pentium M-class processors in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing dynamic VID transitions and load-step transients. Use Value: Burst Mode™ achieves >85% efficiency at 10 mA load; OPTI-LOOP™ stabilizes response with low-ESR polymer output caps. |
Use Scenario: Generating 2.8 V/3 A supply for LTE baseband ICs in small-cell femtocells with strict thermal limits. IC Role / Device Role / Timing Role: High-current step-down controller with remote sense to compensate for PCB trace losses. Use Value: Forced continuous mode (FCB grounded) eliminates switching noise that would interfere with adjacent RF receivers. |
| Industrial DC Distribution System | Automotive Infotainment Display Backlight |
Use Scenario: Converting 24 V vehicle or factory bus to 5 V/8 A for embedded PLC I/O modules. IC Role / Device Role / Timing Role: Wide-input buck controller with UVLO (3.5 V) and overvoltage crowbar (0.86 V) for robust field operation. Use Value: 99.4% max duty cycle enables regulation down to 23.5 V input - avoids brownout during cold-crank events. |
Use Scenario: Powering 4-channel LED backlight drivers (3.3 V/2 A per channel) in automotive center-stack displays. IC Role / Device Role / Timing Role: Precision 0.8 V reference-based controller supporting tight tolerance LED current sources. Use Value: ±1% VREF and remote sensing ensure consistent brightness across temperature (−40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | Integrated power stage (no external MOSFETs); fixed 2 MHz switching; no Burst Mode™; 0.8 V reference. | Lower BOM count but limited to ≤2 A; unsuitable for high-current or low-noise applications requiring FCB control. | Select when board space is constrained and output current ≤2 A; avoid for >3 A or noise-sensitive designs. |
| LTC3850EGN#PBF | Pin-compatible upgrade with higher 500 kHz max frequency, improved current sense accuracy (±1.5%), and enhanced thermal shutdown. | Same GN package and footprint; supports identical external components; adds PGOOD and better light-load efficiency. | Drop-in replacement for new designs requiring higher frequency or tighter current limit tolerance; retains all LTC1735CGN#PBF layout and support circuits. |
Compared with MP2451DT-LF-Z, LTC1735CGN#PBF offers higher current capability, external MOSFET flexibility, and Burst Mode™ for micropower operation; compared with LTC3850EGN#PBF, it lacks PGOOD and has lower max frequency but remains cost-optimized for established 300 kHz designs.
Availability
LTC1735CGN#PBF is available at Aetrix Electronics and suitable for notebook power management, wireless infrastructure DC distribution, and industrial embedded systems requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LTC1735CGN#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1735 product line was designed as a high-efficiency, flexible synchronous buck controller family targeting portable computing and telecom power systems where precision, low IQ, and noise control are critical.
FAQ
What is the maximum supported input voltage for the LTC1735CGN#PBF?
The LTC1735CGN#PBF has an absolute maximum input voltage rating of 36 V, with recommended operating range from 4 V to 30 V. Operation above 30 V risks exceeding internal voltage limits on BOOST, SW, and INTVCC nodes. The undervoltage lockout (UVLO) activates at 3.5–3.9 V to prevent startup under marginal conditions, ensuring reliable operation across its specified range.
Does the LTC1735CGN#PBF include an integrated power MOSFET?
No, the LTC1735CGN#PBF is a controller-only IC and requires two external N-channel MOSFETs - one for the high-side (driven by TG) and one for the low-side (driven by BG). This architecture enables optimization for specific voltage/current requirements and thermal management, unlike monolithic converters. The datasheet references FDS6680A as a validated pair for 9 A operation.
How does the FCB pin affect operating mode selection in the LTC1735CGN#PBF?
The FCB pin selects among three modes: tying to INTVCC enables Burst Mode™ for lowest IQ; grounding forces continuous conduction mode to eliminate switching noise; applying an external clock (0.9–1.3× fO) enables synchronized cycle-skipping. The LTC1735CGN#PBF's FCB pin must not be driven during shutdown (RUN/SS low), as this may cause undefined behavior or latchup.
Can the LTC1735CGN#PBF support remote output voltage sensing?
Yes, the LTC1735CGN#PBF supports true remote sensing via dedicated VOSENSE, SENSE+, and SENSE− pins. VOSENSE connects to the feedback divider at the load, while SENSE+ and SENSE− measure current through RSENSE placed near the output capacitor. This configuration compensates for both IR drop in power paths and load-transient-induced voltage droop, maintaining ±1% regulation at the point of load.
What package type and thermal characteristics apply to the LTC1735CGN#PBF?
The LTC1735CGN#PBF uses a 16-lead narrow plastic SSOP (GN) package measuring 5.0 mm × 6.2 mm with 0.65 mm lead pitch. Its junction-to-ambient thermal resistance is θJA = 130°C/W. The device operates from 0°C to 85°C ambient (C-grade), with maximum junction temperature rated at 125°C. No exposed thermal pad is present; heatsinking relies on PCB copper area under the body.
LTC1735CGN#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
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 30V
- Frequency - Switching:
- 300kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Power Good, Soft Start
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC1735CGN#PBF FAQ
1.How can I place an order for LTC1735CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1735CGN#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 LTC1735CGN#PBF reliable?
The price and inventory of LTC1735CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1735CGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1735CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1735CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1735CGN#PBF?
LTC1735CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1735CGN#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 LTC1735CGN#PBF?
For technical support, including LTC1735CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1735CGN#PBF requirements.
6.How does Aetrix verify that LTC1735CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1735CGN#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 LTC1735CGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1735CGN#PBF?
All LTC1735CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1735CGN#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 LTC1735CGN#PBF part is unused and in its original packaging.
Return procedure for LTC1735CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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