My Inquiry
My Account
Analog Devices Inc. LTC1695CS5#TRMPBF
- Part No.:
- LTC1695CS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Motor Drivers, Controllers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LTC1695CS5#TRMPBF.pdf
- Description:
- IC MOTOR DRVR 4.5V-5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,088
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1695CS5#TRMPBF from Analog Devices (formerly Linear Technology) is a 5V SMBus/I²C-controlled fan speed controller IC integrating a 180mA low-dropout linear regulator, 6-bit DAC, and fault-monitoring logic in a 5-lead SOT-23 package. It regulates brushless DC fan voltage (0–4.922V) via digital command to reduce acoustic noise, power consumption, and thermal stress in portable systems. Confirmed parameters: 6-bit DAC resolution, 0.75Ω P-channel pass FET on-resistance, 250ms boost-start timer, ±0.75 LSB DNL/INL, and SMBus-compatible 10–100kHz interface.
For engineers reviewing the LTC1695CS5#TRMPBF datasheet, LTC1695CS5#TRMPBF pinout, LTC1695CS5#TRMPBF application, or LTC1695CS5#TRMPBF equivalent, this page delivers verified electrical specs, validated SOT-23 pin functions, real-world thermal/fault behavior, and two confirmed alternative fan controllers with documented functional trade-offs - all extracted from official Linear Technology documentation.
Technical Context
The LTC1695CS5#TRMPBF implements closed-loop fan speed control using a 6-bit DAC-driven op-amp feedback loop that modulates gate bias of an internal 0.75Ω P-channel LDO pass transistor. Output voltage (0–4.922V) is set by SMBus-sent 6-bit code (D5–D0), with monotonicity guaranteed across all 64 codes.
It embeds dual protection: current limiting (390mA typical trip) and thermal shutdown (155°C trip, 30°C hysteresis), both signaled via SMBus-readback status bits (OCF/THE). The 250ms boost-start timer forces full-scale output at power-up to overcome fan inertia before transitioning to programmed voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 6-bit (64 monotonic output states); enables precise 78.1mV LSB steps across 4.922V full scale at VCC = 5V. |
| Output Voltage Range | 0V to 4.922V (code 0 to 63); directly sets fan terminal voltage for proportional speed control without PWM noise. |
| Linear Regulator Rating | 180mA continuous output; supports common 5V BLDC fans (e.g., Sunon KDE0502PFB2-8, 1.7 CFM) with 0.75Ω on-resistance. |
| SMBus Interface | 10–100kHz clock rate; compatible with I²C bus; uses fixed 7-bit address 1110100b (0x74) for send/receive byte protocols. |
| Fault Monitoring | Real-time OCF (overcurrent) and THE (thermal shutdown) status bits readable via SMBus; no external sensors required. |
| Boost Start Timer | 250ms (typical) full-scale output pulse at power-up; ensures reliable fan spin-up even at low DAC codes. |
| Thermal Shutdown | Trips at 155°C junction temperature with ~30°C hysteresis; maintains regulation until die cools to ~105°C. |
Pinout & Package
Package: 5-lead plastic SOT-23 (surface-mount, 1.6mm × 2.9mm × 1.1mm), θJA = 256°C/W (JEDEC standard board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input and DAC reference | Supplies internal circuitry; must be bypassed with ≥10µF tantalum capacitor; absolute max 7V. |
| GND (Pin 2) | Ground reference | Primary return path for regulator output and digital logic; tie directly to PCB ground plane. |
| SCL (Pin 3) | SMBus clock input | Open-drain compatible; 1.4V threshold with 40mV hysteresis; requires pull-up to VCC. |
| SDA (Pin 4) | SMBus bidirectional data line | Open-drain output; requires pull-up; supports send byte (DAC programming) and receive byte (fault readback) protocols. |
| VOUT (Pin 5) | Regulator output | Connects directly to fan +VE terminal; outputs 0–4.922V; requires ≥4.7µF medium-ESR (0.1–1Ω) tantalum capacitor for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 6-bit DAC + LDO | Eliminates need for external DAC, op-amp, and pass transistor - reduces BOM count and PCB area by >4 components. |
| 250ms Boost Start Timer | Guarantees fan startup at low commanded voltages by forcing full-scale output for 250ms before settling to DAC code value. |
| SMBus Fault Readback | Enables host microcontroller to detect overcurrent (OCF bit) and thermal shutdown (THE bit) without additional GPIO or ADC channels. |
| Monotonic DAC Transfer | Guaranteed no missing codes (±0.75 LSB DNL); critical for stable closed-loop thermal control without oscillation or step reversals. |
| Low-Noise Linear Regulation | Delivers ripple-free fan voltage vs. PWM alternatives - avoids EMI interference with sensitive analog/RF circuits in portable devices. |
Applications
| Server Blade Thermal Management | Medical Portable Diagnostic Device |
|---|---|
|
Use Scenario: Multi-fan cooling in dense 1U server blades where acoustic noise and power efficiency are constrained. IC Role / Device Role / Timing Role: LTC1695CS5#TRMPBF acts as SMBus-addressable fan voltage regulator, dynamically adjusting speed per CPU/GPU temperature telemetry. Use Value: Reduces average fan power by >40% versus on/off control while maintaining thermal safety margins, extending system runtime and lowering audible noise floor. |
Use Scenario: Battery-powered ultrasound or point-of-care monitor requiring silent operation and extended battery life. IC Role / Device Role / Timing Role: LTC1695CS5#TRMPBF serves as compact, low-EMI fan controller interfacing directly with ARM-based host MCU via shared SMBus bus. Use Value: Enables fan speed ramping during boot and thermal events without PWM-induced signal coupling into analog front-end circuits. |
| Industrial Handheld Scanner | Automotive Infotainment Display Cooling |
|
Use Scenario: Ruggedized barcode scanner operating in variable ambient temperatures (–25°C to 70°C). IC Role / Device Role / Timing Role: LTC1695CS5#TRMPBF regulates fan voltage based on SoC die temperature, with built-in UVLO (2.8V) and thermal shutdown (155°C) for robustness. Use Value: Maintains consistent airflow across temperature extremes while preventing fan stall at cold start via 250ms boost timer. |
Use Scenario: LCD display module in automotive cockpit with limited space and strict EMC requirements. IC Role / Device Role / Timing Role: LTC1695CS5#TRMPBF provides quiet, EMI-clean cooling using existing 5V rail - avoiding need for separate 12V supply or noisy switching regulators. Use Value: Meets CISPR-25 Class 5 radiated emissions limits due to absence of high-frequency switching artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fan speed control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6615ASA+ | 5V SMBus fan controller with integrated tachometer input and 8-bit DAC; lacks boost-start timer and current-limit reporting. | Requires external tach feedback loop; better suited for closed-loop RPM control vs. open-loop voltage control. | Select MAX6615ASA+ when precise RPM monitoring and tighter speed regulation are required; LTC1695CS5#TRMPBF preferred for minimal BOM and lower cost. |
| ADT7460ARQZ | Multi-zone thermal monitor with SMBus fan control; 7-bit DAC, no integrated LDO; requires external pass transistor and biasing. | Supports up to 3 fans and 4 temperature zones; designed for complex thermal management in desktop/server platforms. | Choose ADT7460ARQZ for multi-fan, multi-sensor systems; LTC1695CS5#TRMPBF is optimal for single-fan, space-constrained portable designs. |
Compared with MAX6615ASA+ and ADT7460ARQZ, the LTC1695CS5#TRMPBF offers the smallest footprint and lowest component count for single-fan voltage control, trading off multi-zone support and tach feedback for simplicity, lower EMI, and guaranteed monotonicity - making it ideal for battery-powered and acoustically sensitive applications.
Availability
LTC1695CS5#TRMPBF is available at Aetrix Electronics and suitable for notebook computers, portable medical instruments, and industrial handheld scanners requiring stable component supply and long-term lifecycle support.
Supply support for LTC1695CS5#TRMPBF 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 digital signal processing semiconductors.
The LTC1695CS5#TRMPBF belongs to Linear Technology's power management portfolio, specifically engineered for compact, low-noise, SMBus-addressable fan control in portable and thermally constrained systems.
FAQ
What is the absolute maximum supply voltage for the LTC1695CS5#TRMPBF?
The absolute maximum supply voltage (VCC) for the LTC1695CS5#TRMPBF is 7V. Exceeding this rating may impair device reliability. Operation above 5.5V is outside the specified range; the part is characterized for 4.5V to 5.5V. Undervoltage lockout activates below 2.3V (min), ensuring safe reset behavior during brownout conditions. Always use a ≥10µF low-ESR capacitor on VCC.
Does the LTC1695CS5#TRMPBF support I²C communication, or only SMBus?
The LTC1695CS5#TRMPBF supports both SMBus and I²C protocols. Its SCL/SDA inputs meet Philips I²C voltage thresholds (1.4V with 40mV hysteresis) and timing specifications. It implements SMBus send byte and receive byte protocols with fixed slave address 0x74 (1110100b), and operates at 10–100kHz - fully compatible with standard I²C masters without modification.
How does the boost start feature work in the LTC1695CS5#TRMPBF?
The LTC1695CS5#TRMPBF's boost start feature forces VOUT to full-scale (4.922V) for 250ms after power-up or SMBus command activation, then transitions smoothly to the programmed DAC voltage. This ensures reliable fan spin-up under high static friction or low-temperature conditions. The BST bit (D6) in the SMBus command byte enables or disables this function.
Can the LTC1695CS5#TRMPBF drive a 12V fan?
No, the LTC1695CS5#TRMPBF is designed exclusively for 5V brushless DC fans. Its VOUT range is 0–4.922V, and VCC must be 4.5–5.5V. Attempting to drive a 12V fan would result in insufficient voltage and potential thermal overload. For 12V fans, consider discrete solutions or dedicated higher-voltage fan controllers like the LTC4215.
What fault conditions does the LTC1695CS5#TRMPBF report via SMBus?
The LTC1695CS5#TRMPBF reports two real-time fault conditions via SMBus readback: overcurrent (OCF bit, D7) triggers when load current exceeds ~390mA, and thermal shutdown (THE bit, D6) activates when junction temperature exceeds ~155°C. Both bits remain asserted until cleared by host action or condition resolution, enabling robust system-level thermal and power fault handling.
LTC1695CS5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- High Side
- Interface:
- I2C, SMBus
- Technology:
- PMOS
- Step Resolution:
- -
- Applications:
- Fan Motor Driver
- Current - Output:
- 180mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Voltage - Load:
- 0V ~ 4.922V
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LTC1695CS5#TRMPBF FAQ
1.How can I place an order for LTC1695CS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1695CS5#TRMPBF 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 LTC1695CS5#TRMPBF reliable?
The price and inventory of LTC1695CS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1695CS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1695CS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1695CS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1695CS5#TRMPBF?
LTC1695CS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1695CS5#TRMPBF 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 LTC1695CS5#TRMPBF?
For technical support, including LTC1695CS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1695CS5#TRMPBF requirements.
6.How does Aetrix verify that LTC1695CS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1695CS5#TRMPBF 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 LTC1695CS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1695CS5#TRMPBF?
All LTC1695CS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1695CS5#TRMPBF, 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 LTC1695CS5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1695CS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1695CS5#TRMPBF Tags
-
DRV2603RUNR
Texas Instruments
-
DRV8837CDSGR
Texas Instruments
-
DRV8837DSGR
Texas Instruments
-
DRV8838DSGR
Texas Instruments
-
DRV8839DSSR
Texas Instruments
-
EMC2301-1-ACZL-TR
Microchip Technology
-
DRV8231ADSGR
Texas Instruments
-
EMC2302-2-AIZL-TR
Microchip Technology
-
DRV8800PWPR
Texas Instruments
-
DRV8835DSSR
Texas Instruments
-
EMC2303-1-KP-TR
Microchip Technology
-
DRV8876PWPR
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…
