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Analog Devices Inc. LTC1998CS6#TRMPBF
- Part No.:
- LTC1998CS6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1998CS6#TRMPBF.pdf
- Description:
- IC BATT MON LI-ION 1CEL TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:811
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Product details
Overview
LTC1998CS6#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower comparator with integrated precision adjustable voltage reference in a 6-pin TSOT-23 package, designed specifically for lithium-ion single-cell low-battery detection. It delivers 1% threshold accuracy over temperature using 1% external resistors, 2.5µA typical quiescent current, rail-to-rail output swing, and guaranteed operation down to 1.5V battery voltage.
For engineers reviewing the LTC1998CS6#TRMPBF datasheet, LTC1998CS6#TRMPBF pinout, LTC1998CS6#TRMPBF application, or LTC1998CS6#TRMPBF equivalent, key selection criteria include programmable 2.5V–3.25V trip voltage, 10mV–750mV user-adjustable hysteresis, independent VLOGIC supply for logic-level output compatibility, and guaranteed BATTLO state validity at VBATT ≥ 1.5V.
Technical Context
The LTC1998CS6#TRMPBF implements a proprietary internal architecture that maintains 1% threshold voltage accuracy across –40°C to 85°C by compensating resistor ratio drift, enabling stable low-battery detection without trimming. Its dual-resistor programming interface (VTH.A and VH.A) directly sets trip voltage (VBATT.Th = 2.5V + VTH.A/2) and hysteresis threshold (VTH2 = 2.5V + VH.A/2), with VH.A strictly required to exceed VTH.A to prevent oscillation.
The device features a CMOS push-pull output stage referenced to VLOGIC - not BATT - allowing BATTLO to drive microprocessor I/O rails as low as 1V while operating from batteries up to 5.5V. Propagation delay is 350µs (10mV overdrive) and 150µs (100mV overdrive), with input leakage <1nA on both adjust pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 2.5µA typical at VBATT = 3V - enables multi-year battery life in portable devices |
| Threshold Accuracy | ±1% max over –40°C to 85°C with 1% external resistors - eliminates need for calibration |
| Programmable Threshold | 2.5V to 3.25V via VTH.A pin - covers full Li-ion discharge range (3.0V–2.5V) |
| Hysteresis Range | 10mV to 750mV via VH.A pin - prevents chatter during load shedding recovery |
| Min Valid Battery Voltage | 1.5V - ensures reliable BATTLO state assertion even near end-of-life |
| VLOGIC Supply Range | 1V to VBATT - supports 1.8V/2.5V/3.3V microcontrollers without pull-up resistors |
| Output Type | Rail-to-rail CMOS push-pull - drives logic inputs directly, no external components needed |
Pinout & Package
Package: 6-lead TSOT-23 (ThinSOT™), 1mm height, JEDEC MO-193 compliant, footprint compatible with SOT-23 but thinner and smaller.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Battery voltage input and primary supply | Monitored voltage source; supplies internal circuitry; must connect directly to battery (+) via low-impedance trace |
| GND (Pin 2) | Analog and power ground reference | Return path for BATT current and internal bias; isolate from high-current return paths |
| VTH.A (Pin 3) | Threshold adjust voltage input | Sets low-battery trip point: VBATT.Th = 2.5V + VTH.A/2; accepts 0–1.5V; <1nA leakage |
| VH.A (Pin 4) | Hysteresis adjust voltage input | Sets recovery threshold: VTH2 = 2.5V + VH.A/2; must be > VTH.A to avoid oscillation |
| VLOGIC (Pin 5) | Output driver supply rail | Defines BATTLO high-level voltage; can be ≤ VBATT (e.g., 1.8V) for direct MCU interface |
| BATTLO (Pin 6) | Active-low battery-low indicator output | CMOS push-pull; sinks 1mA @ 0.2V, sources 1mA @ VLOGIC–0.3V; valid for VBATT ≥ 1.5V |
Key Features
| Feature | Design Value |
|---|---|
| 1% threshold accuracy over temperature | Maintains ±1% trip voltage error from –40°C to 85°C using only 1% external resistors - reduces BOM cost and design complexity |
| Independent VLOGIC supply | Enables BATTLO to drive 1.8V/2.5V/3.3V logic directly without pull-up resistors or level shifters - simplifies PCB layout |
| Guaranteed operation at 1.5V battery | Ensures reliable low-battery assertion even when cell voltage drops below typical LDO dropout - extends usable battery capacity |
| Adjustable hysteresis (10–750mV) | Prevents output chatter during transient load recovery after battery-low event - avoids system instability during power management |
| 2.5µA quiescent current | Minimizes standby power draw - supports >10-year shelf life in coin-cell-powered devices |
Applications
| Li-Ion Battery Pack Monitoring | Portable Medical Device Power Management |
|---|---|
Use Scenario: Real-time monitoring of single-cell Li-ion voltage in smart battery packs to trigger low-battery alerts before critical shutdown. IC Role / Device Role / Timing Role: Comparator and reference subsystem generating precise, hysteresis-stabilized BATTLO signal indicating VBATT < programmed threshold. Use Value: Eliminates false triggers during load transients; 1% accuracy ensures consistent end-of-discharge detection across temperature and unit variance. | Use Scenario: Enabling safe power-down sequencing in handheld diagnostic tools powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Low-power voltage supervisor asserting BATTLO to microcontroller when battery falls below 2.7V, initiating graceful shutdown. Use Value: 2.5µA quiescent current preserves battery charge during idle periods; VLOGIC-referenced output interfaces directly with 1.8V MCU GPIO. |
| POS Terminal Battery Backup Control | PDA Low-Battery Warning System |
Use Scenario: Controlling automatic switchover from main Li-ion battery to backup coin cell in retail POS terminals during brownout conditions. IC Role / Device Role / Timing Role: Dual-threshold detector (using combined R1/R2/R3 network) enabling hysteresis-controlled transition between primary and backup power sources. Use Value: Programmable 2.5V–3.25V thresholds and 10–750mV hysteresis allow precise tuning to match battery chemistry and system load profile. | Use Scenario: Generating audible/visual low-battery warnings in personal digital assistants before data loss occurs. IC Role / Device Role / Timing Role: Precision voltage comparator asserting BATTLO to baseband processor when cell voltage crosses 2.85V with 100mV hysteresis. Use Value: Rail-to-rail output drives LED drivers or audio amplifiers directly; 1.5V minimum VBATT operation ensures warning triggers even at deep discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-power battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1440CMS8#PBF | Fixed 1.182V reference; no VLOGIC pin; S08 package; 1.1µA IQ | Requires external resistor divider for Li-ion scaling; output referenced to VCC, not separate logic rail | Lower IQ but lacks VLOGIC flexibility and programmable hysteresis - suitable only if fixed reference and simpler topology suffice |
| TLV7031DBVR | Fixed 1.24V reference; no hysteresis adjust; SOT-23-5; 650nA IQ; open-drain output | Requires external hysteresis network and pull-up; no independent logic supply - limits MCU interface options | Ultra-low IQ advantage offset by added external components and reduced integration - best for cost-sensitive, non-critical applications |
Compared with LTC1998CS6#TRMPBF, LTC1440CMS8#PBF offers lower quiescent current but requires external scaling and lacks VLOGIC-driven output compatibility, while TLV7031DBVR achieves nanoscale IQ at the expense of hysteresis programmability and rail-to-rail drive capability - making LTC1998CS6#TRMPBF the optimal choice for precision, low-battery detection with minimal external components and direct logic interfacing.
Availability
LTC1998CS6#TRMPBF is available at Aetrix Electronics and suitable for portable medical devices, handheld instrumentation, Li-ion battery packs, and consumer electronics requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC1998CS6#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 power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1998 belongs to Linear's micropower precision monitoring product line, engineered specifically for battery-powered systems where accuracy, ultra-low power, and integration of reference + comparator + hysteresis control are essential for reliable end-of-life detection.
FAQ
What is the minimum battery voltage at which LTC1998CS6#TRMPBF guarantees correct BATTLO output state?
LTC1998CS6#TRMPBF guarantees valid BATTLO output state for battery voltages ≥1.5V. This is specified in the Absolute Maximum Ratings and Electrical Characteristics tables, ensuring reliable low-battery assertion even as the Li-ion cell approaches end-of-discharge, unlike many comparators that fail below 2.0V.
How does the VLOGIC pin affect the BATTLO output behavior in LTC1998CS6#TRMPBF?
The VLOGIC pin defines the high-level voltage of the BATTLO output in LTC1998CS6#TRMPBF. When VLOGIC is tied to 1.8V, BATTLO swings rail-to-rail between 0V and 1.8V - enabling direct interface with 1.8V microcontrollers without pull-up resistors. VLOGIC may be set as low as 1V or as high as VBATT, providing flexible logic-level compatibility.
Can LTC1998CS6#TRMPBF be used with a 1% resistor network to achieve ±1% threshold accuracy over temperature?
Yes. LTC1998CS6#TRMPBF is explicitly designed to deliver ≤1% threshold voltage error over –40°C to 85°C when used with 1% tolerance external resistors. This is enabled by its proprietary internal architecture that compensates for resistor temperature coefficient mismatches - eliminating the need for higher-precision (and costlier) resistors.
What is the maximum hysteresis voltage achievable with LTC1998CS6#TRMPBF, and under what condition?
The maximum hysteresis voltage for LTC1998CS6#TRMPBF is 750mV, achievable only when the low-battery threshold is set to its minimum value of 2.5V. As the programmed threshold increases (e.g., to 3.25V), the maximum allowable hysteresis decreases to 100mV - a constraint defined by the internal 2.5V reference and VH.A pin voltage range.
Does LTC1998CS6#TRMPBF require external components to function as a complete low-battery detector?
Yes - LTC1998CS6#TRMPBF requires at least two external resistors (R1, R2) to program the threshold voltage via VTH.A, and optionally a third (R3) for hysteresis via VH.A. No external reference or compensation capacitors are needed. The device integrates the precision reference, comparator, and hysteresis control - minimizing total solution size and component count.
LTC1998CS6#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
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1998CS6#TRMPBF FAQ
1.How can I place an order for LTC1998CS6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1998CS6#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 LTC1998CS6#TRMPBF reliable?
The price and inventory of LTC1998CS6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1998CS6#TRMPBF is usually 5 days.
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Once your LTC1998CS6#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 LTC1998CS6#TRMPBF?
For technical support, including LTC1998CS6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1998CS6#TRMPBF requirements.
6.How does Aetrix verify that LTC1998CS6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1998CS6#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 LTC1998CS6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1998CS6#TRMPBF?
All LTC1998CS6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1998CS6#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 LTC1998CS6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1998CS6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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