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Analog Devices Inc. LTC2903CS6-C1#TRMPBF
- Part No.:
- LTC2903CS6-C1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC2903CS6-C1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:491
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Product details
Overview
LTC2903CS6-C1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in a 6-lead TSOT-23 package, designed to supervise four independent voltage rails-5V, 3.3V, 1.8V, and –5.2V-with ±1.5% threshold accuracy over temperature. It features an active-low open-drain RST output with 200ms reset timeout, ultralow-voltage reset capability down to 0.5V VCC, and power supply glitch immunity for telecom and server power sequencing.
For engineers reviewing the LTC2903CS6-C1#TRMPBF datasheet, LTC2903CS6-C1#TRMPBF pinout, LTC2903CS6-C1#TRMPBF application, or LTC2903CS6-C1#TRMPBF equivalent, key selection criteria include its negative rail monitoring capability (–5.2V), guaranteed 10% undervoltage detection tolerance, low 20µA quiescent current, SOT-23 footprint compatibility, and reset hold time stability across –40°C to 85°C industrial temperature range.
Technical Context
The LTC2903CS6-C1#TRMPBF implements four independent comparators referenced to a bandgap-derived 0.5V internal reference, each scaled for its designated input (VRT50, VRT33, VRT18, VRT52N). Its internal VCC is autonomously generated from the higher of V1 or V2, enabling operation even when only one monitored rail is present above 0.5V.
Reset assertion requires all four inputs to fall below their respective thresholds; deassertion requires all to remain above threshold for 200ms. The RST output uses a weak internal pull-up to V2 (10µA typical) and supports external pull-up for faster rise times or higher VOH, while its pulldown strength is derived from V1/V2/V3 and remains functional down to 0.2V on any active input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Monitored Voltages | 5V (V1), 3.3V (V2), 1.8V (V3), –5.2V (V4) - enables mixed-signature power system supervision including negative bias rails |
| Threshold Accuracy | ±1.5% over temperature - ensures reliable reset timing without over-margining system supply tolerances |
| Reset Timeout | 200ms nominal (140–260ms min/max) - provides robust immunity to transient brownouts during startup or load transients |
| Supply Current | 20µA typical - minimizes loading on sensitive or battery-backed supplies |
| VCC Operating Range | 0.5V guaranteed - allows reset assertion during deep brownout or partial power loss |
| RST Output Type | Active-low open-drain - supports wired-OR reset buses and flexible pull-up to any logic rail |
| Input Voltage Range (V4) | –6.5V to 0.3V - specifically rated for –5.2V rail monitoring without external level-shifting |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1.0mm max height, JEDEC MO-193 compliant. Pin 1 marked with dot; pin 1–6 arranged in standard SOT-23 top-view order.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 1) | Main positive supply input / VCC source | Monitors 5V rail; supplies internal VCC when ≥ V2; bypass with 0.1µF capacitor |
| GND (Pin 2) | Analog and digital ground reference | Common return for all comparators and RST driver; must be low-impedance |
| V2 (Pin 3) | Secondary positive supply input / VCC source | Monitors 3.3V rail; supplies VCC if > V1; bypass with 0.1µF capacitor |
| V3 (Pin 4) | Third positive supply input | Monitors 1.8V rail; assists RST pulldown below 1V; no bypass required unless noisy |
| V4 (Pin 5) | Negative supply input | Monitors –5.2V rail; input range –6.5V to 0.3V; connects directly to negative rail |
| RST (Pin 6) | Open-drain reset logic output | Asserts low when any input violates threshold; internal 10µA pull-up to V2; sinks ≥5µA at VCC = 0.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-voltage reset guarantee | RST remains asserted with VCC as low as 0.5V - ensures deterministic reset during severe brownout |
| –5.2V rail monitoring | Dedicated V4 input rated to –6.5V - eliminates need for external inverting amplifier or level shifter |
| No hysteresis design | Maintains ±1.5% threshold accuracy without sacrificing noise immunity - uses comparator transient integration instead |
| Glitch-immune reset delay | 200ms timer resets on any threshold violation - prevents spurious resets from sub-5Hz noise or ripple |
| Low-profile SOT-23 packaging | 1mm max height TSOT-23 - fits space-constrained optical networking and base station PCB layouts |
Applications
| Multivoltage Telecom Power Systems | Cell Phone Base Station Power Sequencing |
|---|---|
Use Scenario: Supervising 5V control logic, 3.3V FPGA I/O, 1.8V core, and –5.2V analog bias in a distributed RF power amplifier module. IC Role / Device Role / Timing Role: Quad-rail supervisor providing synchronized reset assertion and 200ms hold-off before system release. Use Value: Prevents latch-up or undefined state in mixed-voltage ASICs by ensuring all rails stabilize before release, including negative bias critical for RF front-end linearity. | Use Scenario: Monitoring primary DC-DC outputs feeding baseband processor, memory, transceiver, and analog front-end in macrocell BTS hardware. IC Role / Device Role / Timing Role: Fault-detection node triggering master reset upon undervoltage on any rail, with glitch filtering for noisy switching converter environments. Use Value: Eliminates false resets caused by high-frequency switching noise near –5.2V bias lines, improving field reliability and reducing service calls. |
| Optical Networking Line Cards | Industrial Network Server Power Management |
Use Scenario: Validating power integrity across 5V management MCU, 3.3V SerDes, 1.8V PHY, and –5.2V laser diode bias on pluggable optical modules (SFP+, QSFP). IC Role / Device Role / Timing Role: Compact voltage supervisor embedded in tight-form-factor optics, asserting RST until all rails meet spec for 200ms. Use Value: Enables hot-plug compliance by preventing link initialization until full rail stabilization, especially critical for negative bias affecting laser modulation accuracy. | Use Scenario: Ensuring safe boot sequence across redundant 5V backplane, 3.3V PCIe switch, 1.8V DDR controller, and –5.2V legacy interface circuitry in 1U rack servers. IC Role / Device Role / Timing Role: Centralized reset arbiter interfacing with BMC and CPLD to gate system enable signals based on quad-rail health. Use Value: Guarantees coordinated power-up across heterogeneous subsystems, avoiding bus contention or configuration corruption due to out-of-spec rail timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2903IS6-C1 | Same functionality and pinout, but rated for –40°C to 85°C industrial temperature range vs. 0°C to 70°C for LTC2903CS6-C1#TRMPBF | Suitable for extended-temperature deployments such as outdoor base stations or uncooled network equipment | Select LTC2903IS6-C1 when operating ambient exceeds 70°C or requires full industrial temp qualification |
| LTC2900CS6-5 | Quad monitor with user-selectable thresholds (16 combinations); no native –5.2V support - requires external resistor divider for negative rail | Offers flexibility for non-standard rail combinations but adds design complexity and accuracy degradation for –5.2V | Choose LTC2900CS6-5 only if monitoring non-standard voltages beyond the fixed C1 set; avoid for pure –5.2V use cases |
Compared with LTC2903IS6-C1, the LTC2903CS6-C1#TRMPBF trades extended temperature range for lower cost and qualification overhead in commercial-grade systems; compared with LTC2900CS6-5, it delivers superior accuracy and simplicity for the exact 5V/3.3V/1.8V/–5.2V combination without external components.
Availability
LTC2903CS6-C1#TRMPBF is available at Aetrix Electronics and suitable for multivoltage telecom power systems, cell phone base station power sequencing, and optical networking line cards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2903CS6-C1#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 acquired Linear Technology in 2017 and maintains full product continuity, technical documentation, and manufacturing for the LTC portfolio.
The LTC2903 series was designed specifically for high-accuracy, low-power quad-supply monitoring in space-constrained, noise-sensitive infrastructure equipment - emphasizing rail-specific thresholds, ultralow-VCC operation, and glitch immunity without hysteresis.
FAQ
What is the guaranteed operating temperature range for LTC2903CS6-C1#TRMPBF?
The LTC2903CS6-C1#TRMPBF is specified for operation from 0°C to 70°C (commercial grade). This range is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics notes for the "C" grade variant. For extended-temperature applications, the pin-compatible LTC2903IS6-C1 (–40°C to 85°C) is recommended. The device's ±1.5% threshold accuracy and 200ms reset timeout are guaranteed across this full 0°C to 70°C span.
Can LTC2903CS6-C1#TRMPBF monitor a –5.2V rail without external components?
Yes. The LTC2903CS6-C1#TRMPBF V4 input is explicitly rated for –6.5V to 0.3V and is factory-configured to monitor –5.2V with 10% undervoltage detection (VRT52N = –4.602V typical). No level-shifting circuitry, resistive dividers, or op-amps are required - the –5.2V rail connects directly to Pin 5 (V4). This capability is unique to the C1 variant and distinguishes it from other LTC2903 options.
How does the RST output behave when VCC drops below 1V?
The LTC2903CS6-C1#TRMPBF RST output maintains active-low assertion down to VCC = 0.5V, sinking ≥5µA with VOL ≤ 150mV. Below 0.5V, behavior is not guaranteed. The internal pulldown circuit leverages V1, V2, and V3 inputs - so even with VCC < 1V, RST remains strongly pulled low as long as at least one monitored rail (V1, V2, or V3) stays above 0.2V. This ensures fail-safe reset during deep brownout conditions where conventional supervisors lose drive capability.
Is LTC2903CS6-C1#TRMPBF pin-compatible with other LTC2903 variants?
Yes - all LTC2903 S6-package variants (A1, B1, C1, D1, E1, in both C and I grades) share identical 6-lead TSOT-23 pinout and footprint. The V1–V4 inputs and RST output retain consistent electrical roles across variants; only the factory-programmed threshold values differ. This allows direct substitution during prototyping or BOM optimization, provided the target rail voltages match the variant's configuration (e.g., C1 for –5.2V, B1 for +1.8V).
What is the purpose of the internal 10µA pull-up on the RST pin?
The internal 10µA pull-up on the RST pin of LTC2903CS6-C1#TRMPBF connects to V2 and ensures a defined high-impedance logic-high state when no external pull-up is used - simplifying basic designs. However, it limits VOH to ~V2 – 1V and results in slow rise times (tRISE ≈ 2.2 × 50kΩ × CLOAD). For faster edges, higher VOH, or wired-OR configurations, an external pull-up resistor to VCC or another rail is required. The internal pull-up is disabled when an external pull-up is applied.
LTC2903CS6-C1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- 1.593V, 2.921V, 4.425V, -4.602V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC2903CS6-C1#TRMPBF FAQ
1.How can I place an order for LTC2903CS6-C1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2903CS6-C1#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 LTC2903CS6-C1#TRMPBF reliable?
The price and inventory of LTC2903CS6-C1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2903CS6-C1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2903CS6-C1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2903CS6-C1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2903CS6-C1#TRMPBF?
LTC2903CS6-C1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2903CS6-C1#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 LTC2903CS6-C1#TRMPBF?
For technical support, including LTC2903CS6-C1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2903CS6-C1#TRMPBF requirements.
6.How does Aetrix verify that LTC2903CS6-C1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2903CS6-C1#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 LTC2903CS6-C1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2903CS6-C1#TRMPBF?
All LTC2903CS6-C1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2903CS6-C1#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 LTC2903CS6-C1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2903CS6-C1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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