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Analog Devices Inc. LTC2951CDDB-1#TRMPBF
- Part No.:
- LTC2951CDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2951CDDB-1#TRMPBF.pdf
- Description:
- IC PUSH BUTTON ON/OFF CTRLR 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,002
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Product details
Overview
LTC2951CDDB-1#TRMPBF from Analog Devices (acquired Linear Technology) is a micropower pushbutton ON/OFF controller with open-drain EN output (active-high), 2.7V–26.4V input range, 6µA quiescent current, and 128ms fixed turn-on debounce. It interfaces between mechanical pushbuttons and DC/DC converters in battery-powered portable instrumentation and embedded systems requiring graceful power sequencing.
For engineers reviewing the LTC2951CDDB-1#TRMPBF datasheet, LTC2951CDDB-1#TRMPBF pinout, LTC2951CDDB-1#TRMPBF application, or LTC2951CDDB-1#TRMPBF equivalent, key selection criteria include EN polarity (high-true), KILL input threshold (0.6V), adjustable KILL turn-off delay via KILLT capacitor, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2951CDDB-1#TRMPBF implements a deterministic state machine for pushbutton-initiated power control, with separate internal timers for turn-on (128ms fixed), turn-off (32ms base + adjustable OFFT), and KILL timeout (128ms base + adjustable KILLT). Its PB input features ±10kV HBM ESD protection and operates up to 26.4V, enabling direct connection to high-voltage rails without level shifting.
It provides dual-handshake signaling: INT asserts low to notify the µP of pending power-down, while KILL must be driven low by the µP to confirm orderly shutdown; failure triggers automatic EN release after KILL blanking (512ms) and timeout (128ms + optional delay). The EN output drives DC/DC converter shutdown pins with 0.11V VOL at 3mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 26.4V - supports single-cell Li-ion to multi-cell battery stacks and industrial 24V rails. |
| Quiescent Current | 6µA typical - enables years of operation on coin-cell batteries in always-on monitoring applications. |
| EN Output Polarity | Active-high open-drain - directly interfaces with DC/DC converters having internal pull-up on SHDN (e.g., LT1767-3.3). |
| Turn-On Debounce | 128ms fixed - prevents false power-on from mechanical switch bounce during initial press. |
| KILL Input Threshold | 0.6V ±30mV - allows precise undervoltage monitoring of VIN via resistor divider without external comparator. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including portable meters and PDA devices. |
| Package | 8-pin DFN (3mm × 2mm) - surface-mount footprint optimized for compact portable electronics PCBs. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 2mm), exposed pad (optional GND connection), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power supply input | Accepts 2.7V–26.4V; powers internal regulator and logic; absolute max 33V. |
| PB (Pin 2) | Pushbutton input | High-voltage tolerant (–6V to 26.4V); internal 100kΩ pull-up to 1.9V bias; ±10kV HBM ESD rated. |
| KILLT (Pin 3) | KILL turn-off delay adjust | Connects external capacitor to extend KILL timeout beyond 128ms default (e.g., 0.033µF adds ~11.5ms). |
| GND (Pin 4) | Ground reference | Primary return path; exposed pad may be connected to GND for thermal relief. |
| INT (Pin 5) | Open-drain interrupt output | Signals µP of valid power-down request; sinks current when pulled low; requires external pull-up. |
| EN (Pin 6) | Enable output (LTC2951-1) | Active-high open-drain; drives DC/DC SHDN; VOL = 0.11V @ 3mA; max 10V rating. |
| OFFT (Pin 7) | Turn-off debounce adjust | Connects external capacitor to extend PB hold time beyond 32ms default (e.g., 0.033µF adds ~11.5ms). |
| KILL (Pin 8) | Failsafe shutdown input | 0.6V threshold comparator input; used for µP handshake or VIN undervoltage detection. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable KILL timeout delay | Extends system power-down safety window beyond 128ms base using KILLT capacitor-ensures reliable fault shutdown even if µP hangs. |
| High-voltage PB input | Operates up to 26.4V with ±10kV HBM ESD rating-eliminates need for external voltage clamping or level shifters in 12V/24V systems. |
| Low-power housekeeping mode | Draws only 6µA after power-on-enables continuous pushbutton monitoring in battery-critical applications like handheld meters. |
| Programmable turn-off debounce | OFFT pin accepts capacitor to add precise delay (9–13.5ms per 1500pF) before INT assertion-prevents spurious shutdown from noisy button traces. |
| Integrated KILL blanking timer | 512ms post-power-on window ignores KILL input-guarantees DC/DC and µP full startup before enabling software-controlled shutdown. |
Applications
| Portable Instrumentation Meters | Blade Servers |
|---|---|
Use Scenario: Handheld multimeter powered by dual AA batteries with momentary power button and auto-shutdown. IC Role / Device Role / Timing Role: LTC2951CDDB-1#TRMPBF acts as primary power sequencer-asserts EN to enable DC/DC, monitors PB for shutdown, and uses KILL to detect low battery via VIN divider. Use Value: 6µA quiescent current extends battery life to >2 years in standby; 128ms turn-on debounce prevents accidental activation; KILL threshold ensures shutdown before brownout. | Use Scenario: Hot-swap power module in 1U blade server chassis requiring controlled power-up/down of compute modules. IC Role / Device Role / Timing Role: LTC2951CDDB-1#TRMPBF manages enable timing for isolated DC/DC converters feeding FPGA and memory rails, with INT/KILL handshake to BMC firmware. Use Value: 26.4V input range accommodates 12V backplane; 512ms KILL blanking guarantees FPGA configuration completes before BMC gains control; EN polarity matches common SHDN pin logic. |
| Portable Customer Service PDA | Desktop and Notebook Computers |
Use Scenario: Ruggedized field service PDA with sealed tactile button and Li-ion battery pack. IC Role / Device Role / Timing Role: LTC2951CDDB-1#TRMPBF serves as hardware power controller-debounces mechanical button, asserts EN to PMIC, and uses INT to trigger OS-level shutdown sequence. Use Value: PB pin's –6V to 26.4V tolerance withstands ESD events in industrial environments; OFFT capacitor eliminates false shutdown from trace noise; DFN-8 saves board area in slim form factor. | Use Scenario: Auxiliary power management for USB-C PD negotiation circuitry or embedded controller in thin-and-light notebook design. IC Role / Device Role / Timing Role: LTC2951CDDB-1#TRMPBF controls auxiliary rail enable during EC-initiated sleep/wake transitions, with KILL tied to EC GPIO for coordinated shutdown. Use Value: 0.6V KILL threshold allows direct connection to 3.3V GPIO with resistive divider; EN VOL < 0.4V ensures clean logic-low detection by PD controller; 70°C temp grade covers internal chassis thermal profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar pushbutton power control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V supply monitor with manual reset; no programmable debounce, no KILL handshake, no adjustable timeouts. | Only suitable for simple reset generation-not for sequenced ON/OFF control with µP coordination. | Select only if application requires basic voltage supervision without pushbutton interface or graceful shutdown logic. |
| MAX6373KA+T | Pushbutton supervisor with 140ms turn-on debounce, but no KILL input, no INT output, and no adjustable OFFT/KILLT delays. | Lacks µP handshaking capability-cannot support controlled software-initiated shutdown sequences. | Choose when only basic power toggle is needed and system does not require fail-safe timeout or firmware coordination. |
Compared with TPS3808G33DBVR and MAX6373KA+T, the LTC2951CDDB-1#TRMPBF uniquely integrates adjustable timing, bidirectional µP handshaking (INT/KILL), and high-voltage PB tolerance-making it the only option for battery-powered systems requiring both robust mechanical interface and firmware-coordinated power sequencing.
Availability
LTC2951CDDB-1#TRMPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade server power modules, and customer service PDAs requiring stable component supply across long production lifecycles.
Supply support for LTC2951CDDB-1#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through acquisition of Linear Technology in 2017.
The LTC2951 family was designed by Linear Technology specifically for ultra-low-power, wide-input-voltage pushbutton power sequencing in portable and embedded systems-emphasizing reliability, timing precision, and integration of safety features like KILL timeout.
FAQ
What is the EN output behavior of LTC2951CDDB-1#TRMPBF during power-on and power-off sequences?
The LTC2951CDDB-1#TRMPBF EN output is active-high open-drain. During power-on, EN asserts high after 128ms PB hold time and remains high for 512ms (KILL blanking period); if KILL is not driven high within that window, EN releases low. During power-off, EN releases low after INT assertion and KILL timeout (128ms + optional KILLT delay) unless KILL is driven low earlier by the µP. This behavior ensures controlled DC/DC enable/disable sequencing.
How does the KILL input function in LTC2951CDDB-1#TRMPBF when no microprocessor is present?
When no µP is present, the KILL input of LTC2951CDDB-1#TRMPBF can be configured as a voltage monitor using a resistor divider from VIN. If VIN drops below the 0.6V threshold at KILL, the LTC2951CDDB-1#TRMPBF immediately releases EN, powering down the system. A bypass capacitor may be added to suppress noise-induced false trips, and the minimum detectable pulse width is 30µs.
Can LTC2951CDDB-1#TRMPBF operate with a 12V input supply and still maintain its 6µA quiescent current?
Yes, LTC2951CDDB-1#TRMPBF maintains 6µA typical quiescent current across its full 2.7V–26.4V input range, including 12V operation. Electrical characteristics data confirms IIN = 6µA at VIN = 12V (and also at 2.7V and 24V), making it suitable for automotive accessory rails, industrial 12V systems, and multi-cell battery packs without compromising battery life.
What is the purpose of the OFFT pin in LTC2951CDDB-1#TRMPBF, and how is it configured?
The OFFT pin in LTC2951CDDB-1#TRMPBF adds adjustable time to the base 32ms turn-off debounce. A capacitor connected from OFFT to GND extends the required PB hold time before INT assertion-e.g., 1500pF adds 11.5ms. Floating OFFT defaults to 32ms. This feature prevents false shutdown from mechanical bounce or EMI on the pushbutton trace, and is independent of the KILL timeout mechanism.
Is LTC2951CDDB-1#TRMPBF pin-compatible with LTC2951CDDB-2#TRMPBF, and what is the key functional difference?
No, LTC2951CDDB-1#TRMPBF is not pin-compatible with LTC2951CDDB-2#TRMPBF in terms of EN output logic polarity. Both share identical pinout and package, but LTC2951CDDB-1#TRMPBF has active-high EN (EN), while LTC2951CDDB-2#TRMPBF has active-low EN (EN). This difference affects how each interfaces with DC/DC converter shutdown pins-LTC2951CDDB-1#TRMPBF targets parts with internal pull-up, LTC2951CDDB-2#TRMPBF targets those with internal pull-down or PFET gate drive.
LTC2951CDDB-1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Push Button, On/Off Controller
- Voltage - Input:
- -
- Voltage - Supply:
- 2.7V ~ 26.4V
- Current - Supply:
- 6 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2951CDDB-1#TRMPBF FAQ
1.How can I place an order for LTC2951CDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2951CDDB-1#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 LTC2951CDDB-1#TRMPBF reliable?
The price and inventory of LTC2951CDDB-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2951CDDB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2951CDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2951CDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2951CDDB-1#TRMPBF?
LTC2951CDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2951CDDB-1#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 LTC2951CDDB-1#TRMPBF?
For technical support, including LTC2951CDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2951CDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LTC2951CDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2951CDDB-1#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 LTC2951CDDB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2951CDDB-1#TRMPBF?
All LTC2951CDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2951CDDB-1#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 LTC2951CDDB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2951CDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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