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Analog Devices Inc. LTC1729CMS8-8.2#PBF
- Part No.:
- LTC1729CMS8-8.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1729CMS8-8.2#PBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
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Product details
Overview
LTC1729CMS8-8.2#PBF from Analog Devices (formerly Linear Technology) is a smart lithium-ion battery charge termination controller for 2-cell (8.2V nominal) applications. It provides C/10 current detection, 3-hour time-out termination, trickle-charge preconditioning below 5.4V, temperature qualification via NTC thermistor (0°C–50°C), and automatic battery/charger presence detection. It interfaces with step-down or SEPIC chargers such as LT1512 and LT1513 in portable power systems.
For engineers reviewing the LTC1729CMS8-8.2#PBF datasheet, LTC1729CMS8-8.2#PBF pinout, LTC1729CMS8-8.2#PBF application, or LTC1729CMS8-8.2#PBF equivalent, key selection criteria include its 8.2V battery voltage threshold, MSOP-8 package compatibility, integrated 0.2% precision OVP divider, NTC-based thermal lockout behavior, and dual-termination logic (C/10 + timer).
Technical Context
The LTC1729CMS8-8.2#PBF implements a state-machine-driven termination architecture with six internal comparators (COMP1–COMP6), UVLO circuitry, and a 131kHz oscillator driving a 25-bit counter. Its logic enforces strict sequencing: preconditioning at ≤5.4V (VMIN), charging enable above VMIN and below VMAX (9.013V), and automatic hold/reset on NTC voltage violations (e.g., <0.405V hot or >2.79V cold).
It operates exclusively in conjunction with external switching chargers - not standalone - requiring only six interconnect pins (VC, STATUS, BAT, SENSE, NTC, OVP). The IC sources 12mA during preconditioning and 1.3mA during full charge on the BAT pin, clamping VBAT at 9.0V/cell via internal pull-down when exceeding VMAX, and delivering open-drain outputs on VC (charger enable) and STATUS (charge status/C/10 indicator).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBAT Threshold (VMAX) | 9.013V typical high-going threshold - sets upper safe limit for 2-cell Li-ion termination; clamps VBAT to prevent overvoltage damage |
| VBAT Threshold (VMIN) | 5.4V typical low-going threshold - triggers 12mA trickle preconditioning when cell voltage drops below this level |
| NTC Hot Hold Threshold | 0.405V low-going - disables charging and freezes timers if thermistor indicates >50°C; prevents thermal runaway |
| NTC Cold Hold Threshold | 2.79V high-going - disables charging and freezes timers if thermistor indicates <0°C; avoids low-temp lithium plating |
| Timer for Charging (TIMER2) | 3 hours typical - primary termination condition; forces VC pin low and transitions to Done state after timeout |
| C/10 Detection Filter | 3-second digital filter - ensures stable C/10 current drop confirmation before soft-pulling STATUS high; avoids false termination |
| OVP Pin Reference Voltage | 2.465V ±0.2% - precision internal divider reference enabling accurate 8.2V/8.4V battery voltage monitoring |
| VCC UVLO Threshold | 10.4V typical high-going - enables operation only when input supply meets minimum for 2-cell system; prevents erratic startup |
Pinout & Package
Package: 8-pin MSOP (MS8), 3.0mm × 3.0mm × 0.86mm profile, JEDEC MO-187 variant, rated θJA = 200°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVP (1) | Voltage feedback monitor input | Connects to precision resistor divider from battery; compares against 2.465V internal reference to detect VMAX/VMIN |
| BAT (2) | Battery voltage sensing & current source | Senses battery voltage; sources 12mA (precondition) or 1.3mA (charge); clamped at 9.0V/cell during overvoltage |
| SENSE (3) | C/10 current detection input | Sinks 100µA to set C/10 threshold; compares voltage across external sense resistor to determine charge completion |
| GND (4) | Analog ground reference | Common return for all internal comparators, bias currents, and logic; must be low-impedance connection to system ground |
| NTC (5) | Thermistor interface input | 100µA bias current source; monitors NTC voltage to enforce 0°C–50°C charge window; triggers Hold/Reset on violation |
| STATUS (6) | Open-drain charge status output | Hard pull-down during charge; switches to 50µA soft pull-down at C/10; floats high at timer expiry or power removal |
| VC (7) | Open-drain charger control output | Pulled low to disable external charger (e.g., LT1512/LT1513); open-circuit enables charging; driven low in Hold/Reset/Done |
| VCC (8) | Supply input | Accepts 12V nominal input; UVLO activates at 9.6V (low) / 10.4V (high); powers all internal circuitry and bias sources |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.2% precision OVP divider | Enables accurate 8.2V battery voltage regulation without external trimming; eliminates calibration overhead in production |
| Trickle-charge preconditioning | Automatically applies 12mA constant current when VBAT < 5.4V, preventing damage to deeply discharged cells before full charge |
| Dual-termination logic | Combines time-based (3-hour) and current-based (C/10) termination - improves safety and capacity utilization vs. single-method schemes |
| NTC-based thermal qualification | Uses internal 100µA bias and comparator thresholds to halt charging outside 0°C–50°C, meeting IEC 62133 thermal safety requirements |
| Automatic battery/charger detection | Detects battery insertion/removal via VBAT ramp analysis and charger presence via VC interaction - enables seamless cradle charging |
| Low quiescent current in standby | Draws only 1µA typical when VCC < UVLO (e.g., adapter removed), minimizing parasitic battery drain in portable devices |
Applications
| Cellular Phones | PDAs |
|---|---|
Use Scenario: Compact 2-cell Li-ion charging in space-constrained handsets with thermal management and safety compliance. IC Role / Device Role / Timing Role: Charge termination controller coordinating with LT1512 SEPIC charger; manages precondition, C/10 detection, and 3-hour timeout. Use Value: Enables reliable full-charge delivery while enforcing JEITA-compliant thermal windows and preventing overvoltage on aging cells. |
Use Scenario: Dual-battery charging in legacy PDA docks where battery presence and adapter detection are critical. IC Role / Device Role / Timing Role: Smart termination supervisor interfacing with LT1510-5 step-down charger; detects battery insertion and resets timers automatically. Use Value: Eliminates manual reset requirement and supports hot-swap battery replacement without firmware intervention. |
| Cradle Chargers | Camcorders |
Use Scenario: Desktop cradle with integrated 2-cell Li-ion charging and LED status indication for consumer electronics. IC Role / Device Role / Timing Role: Status coordinator using STATUS pin's three-state output (hard pull-down, soft 50µA, high-Z) for amber/green LED signaling. Use Value: Provides unambiguous visual feedback for charging progress, C/10 event, and completion - no microcontroller required. |
Use Scenario: High-reliability 2-cell charging in professional camcorders operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Thermal guard using NTC pin to suspend charging at <0°C or >50°C; resumes automatically when within range. Use Value: Prevents lithium dendrite formation and electrolyte decomposition, extending cycle life and ensuring field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion charge termination applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1729CMS8-8.4#PBF | Configured for 8.4V battery threshold (VMAX = 9.5V typ); identical pinout, timing, and feature set | Targeted at 2-cell Li-ion packs with 4.2V/cell chemistry; not suitable for 4.1V/cell or 8.2V nominal systems | Select only if battery pack specifies 4.2V/cell rating; mismatch causes premature termination or overcharge risk |
| LTC4060EDD#PBF | Standalone Li-ion charger IC with integrated MOSFET drivers; includes built-in 500mA switch, no external charger needed | Replaces entire charger + termination subsystem; requires different PCB layout and lacks direct LT15xx compatibility | Choose for simplified BOM and space-constrained designs where external charger integration is undesirable |
Compared with LTC1729CMS8-8.2#PBF, the -8.4 variant shifts the VMAX threshold upward by 0.487V, altering termination voltage accuracy for 4.2V/cell cells, while LTC4060EDD#PBF eliminates the need for an external charger IC but sacrifices flexibility in current scaling and topology choice.
Availability
LTC1729CMS8-8.2#PBF is available at Aetrix Electronics and suitable for cellular phones, PDAs, and cradle chargers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for industrial and consumer OEM programs.
Supply support for LTC1729CMS8-8.2#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 acquired Linear Technology in 2017 and maintains full product support, datasheet documentation, and application engineering for the LTC portfolio.
The LTC1729 series belongs to Linear's precision battery management IC family, designed specifically for safe, autonomous termination of constant-voltage/constant-current Li-ion charging in portable electronics with minimal external components.
FAQ
What is the exact battery voltage threshold programmed into LTC1729CMS8-8.2#PBF?
The LTC1729CMS8-8.2#PBF is factory-trimmed for a nominal 8.2V two-cell Li-ion system, with a typical high-going VMAX threshold of 9.013V and VMIN threshold of 5.4V. These values derive from its internal 0.2%-accurate 2.465V OVP reference and fixed resistor ratio, ensuring precise termination without external calibration.
How does LTC1729CMS8-8.2#PBF interact with the external charger IC?
The LTC1729CMS8-8.2#PBF controls the external charger via its open-drain VC pin: pulling VC low disables the charger (e.g., turns off LT1512's gate drive), while leaving VC open allows normal operation. It also monitors SENSE and BAT pins to detect current and voltage conditions, coordinating termination autonomously.
Can LTC1729CMS8-8.2#PBF operate without an NTC thermistor?
No - the NTC pin must be terminated with either a 10kΩ NTC thermistor or a 10kΩ fixed resistor. Leaving the pin floating violates absolute maximum ratings and disables thermal qualification. A fixed resistor bypasses temperature enforcement but maintains bias current path and logic stability.
What happens to the STATUS pin when charging completes?
Upon 3-hour timer expiry or power removal, the STATUS pin transitions to high-impedance (open-circuit). With a pull-up resistor (e.g., 47kΩ), this results in a logic-high signal indicating charge completion - distinct from the hard pull-down (charging) and 50µA soft pull-down (C/10 active) states.
Is LTC1729CMS8-8.2#PBF compatible with LT1769-based charger designs?
Yes - the LTC1729CMS8-8.2#PBF is explicitly listed as compatible with LT1769 (2A step-down charger with input current limit). Interfacing requires connecting VC, STATUS, BAT, SENSE, NTC, and OVP pins per the functional block diagram; no additional level-shifting or buffering is needed.
LTC1729CMS8-8.2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 8.2V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1729CMS8-8.2#PBF FAQ
1.How can I place an order for LTC1729CMS8-8.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1729CMS8-8.2#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 LTC1729CMS8-8.2#PBF reliable?
The price and inventory of LTC1729CMS8-8.2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1729CMS8-8.2#PBF is usually 5 days.
3.What payment methods are accepted for LTC1729CMS8-8.2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1729CMS8-8.2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1729CMS8-8.2#PBF?
LTC1729CMS8-8.2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1729CMS8-8.2#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 LTC1729CMS8-8.2#PBF?
For technical support, including LTC1729CMS8-8.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1729CMS8-8.2#PBF requirements.
6.How does Aetrix verify that LTC1729CMS8-8.2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1729CMS8-8.2#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 LTC1729CMS8-8.2#PBF meets industry standards.
7.What is the process for return or replacement of LTC1729CMS8-8.2#PBF?
All LTC1729CMS8-8.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1729CMS8-8.2#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 LTC1729CMS8-8.2#PBF part is unused and in its original packaging.
Return procedure for LTC1729CMS8-8.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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