My Inquiry
My Account
Analog Devices Inc. LTC1729CMS8-8.4#PBF
- Part No.:
- LTC1729CMS8-8.4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1729CMS8-8.4#PBF.pdf
- Description:
- IC BATT CHG LI-ION 2CELL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:100
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1729CMS8-8.4#PBF from Analog Devices (formerly Linear Technology) is a lithium-ion battery charge termination controller for 2-cell (8.4V nominal) systems, providing C/10 current detection, 3-hour time-out termination, trickle-charge preconditioning below 5.4V, and NTC-based temperature qualification between 0°C and 50°C. It interfaces with external step-down or SEPIC chargers including LT1505, LT1512, and LT1513 to form complete smart charging solutions for portable electronics.
For engineers reviewing the LTC1729CMS8-8.4#PBF datasheet, LTC1729CMS8-8.4#PBF pinout, LTC1729CMS8-8.4#PBF application, or LTC1729CMS8-8.4#PBF equivalent, key selection criteria include its 8.4V battery voltage support, MSOP-8 package footprint, ±0.2% internal voltage reference accuracy, NTC thermistor interface compliance, and compatibility with high-current (>2A) charger ICs requiring VC-controlled enable/disable.
Technical Context
The LTC1729CMS8-8.4#PBF implements a state-machine-driven charge control architecture with six internal comparators, UVLO (9.6V typ), and precision resistor dividers for VMAX = 9.013V and VMIN = 5.4V thresholds. Its logic block integrates timers for trickle-charge (1 hr), main charge (3 hr), and digital filtering (3.5 sec for C/10 detection).
It operates with a 100µA NTC bias current, supports 12mA trickle-charge sourcing at BAT, and delivers 1.3mA constant-current sourcing during full charge - all clamped to ≤9.5V on BAT. The STATUS and VC pins are open-drain outputs with defined VOL (0.9V max @ 3mA and 0.6V max @ 1mA respectively), enabling direct interface with charger ICs and microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBAT Range | 5.1V to 9.5V - supports 2-cell Li-ion packs with 4.2V/cell nominal; clamp prevents overvoltage damage during protection-circuit disconnect transients |
| C/10 Detection | ±2.5mV offset tolerance - enables accurate 10% full-scale current termination using external sense resistor without calibration |
| NTC Interface | 0.206V reset / 0.405V hot hold / 2.79V cold hold thresholds - ensures safe charging only within 0°C–50°C with 10kΩ thermistor |
| UVLO Threshold | 9.6V typical high-to-low transition - disables operation when input supply drops below safe level for 2-cell charging |
| Internal Reference | ±0.2% accuracy at OVP pin - guarantees precise 8.4V battery regulation when paired with compatible charger ICs |
| Timer Accuracy | ±30% over temperature - provides reliable 3-hour charge termination independent of external components |
| Package | 8-pin MSOP (3mm × 3mm, 0.65mm pitch) - low-profile surface-mount package suitable for space-constrained portable designs |
Pinout & Package
Package: 8-lead plastic MSOP (MS8), 3mm × 3mm body, 0.65mm lead pitch, thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVP (1) | Voltage feedback monitor input | Connects to internal 2.465V precision divider; sets 8.4V battery regulation point via external resistor network |
| BAT (2) | Battery voltage sensing & current source | Sources 12mA (trickle) or 1.3mA (charge); clamped to ≤9.5V; enables battery presence detection |
| SENSE (3) | C/10 current threshold comparator input | Sinks 100µA to set current threshold; used with external sense resistor for accurate termination |
| GND (4) | Analog ground reference | Common return for all internal comparators and bias circuits; must be low-impedance connection |
| NTC (5) | Thermistor monitoring input | 100µA bias current source; detects cold/hot conditions and forces Hold or Reset states |
| STATUS (6) | Open-drain charge status output | Pulled low during charge; transitions to 50µA soft pull-down at C/10; floats after timer expiry |
| VC (7) | Open-drain charger enable/disable control | Drives external charger's enable pin; pulled low to disable charging during Hold, Reset, or Done states |
| VCC (8) | Supply input | Accepts 9V–30V input; includes UVLO (9.6V typ); powers internal circuitry and bias sources |
Key Features
| Feature | Design Value |
|---|---|
| Trickle-charge preconditioning | Automatically activates 12mA current source when VBAT < 5.4V, preventing damage to deeply discharged 2-cell Li-ion batteries |
| Temperature-qualified charging | Uses internal 100µA NTC bias and dual-threshold comparators to halt charging outside 0°C–50°C range |
| Multi-mode termination | Supports both time-based (3-hour) and current-based (C/10) termination, with configurable priority via STATUS–NTC tie |
| Integrated battery presence detection | Detects battery insertion/removal via VBAT ramp monitoring and automatic state reset - no external circuitry required |
| Robust overvoltage protection | Clamps VBAT to ≤9.5V and pulls VC low during transient overvoltage events caused by pack protection-circuit disconnect |
Applications
| Cellular Phones | PDAs |
|---|---|
Use Scenario: Dual-cell Li-ion charging in slim smartphone platforms with thermal management constraints. IC Role / Device Role / Timing Role: Charge termination controller coordinating with LT1505 or LT1769 charger ICs; manages C/10 detection, 3-hour timeout, and NTC-based thermal lockout. Use Value: Enables safe, autonomous charging without host processor intervention while meeting JEITA temperature guidelines. | Use Scenario: High-density PDA battery charging where board area is limited and thermal gradients vary across enclosure. IC Role / Device Role / Timing Role: Smart termination supervisor interfacing with LT1512 SEPIC charger; handles battery detect, trickle start, and dual-threshold NTC monitoring. Use Value: Reduces BOM count by eliminating discrete comparators and timers; ensures charge halts before cell degradation at temperature extremes. |
| Cradle Chargers | Camcorders |
Use Scenario: Docking station charging for handheld devices with intermittent battery contact and variable ambient temperature. IC Role / Device Role / Timing Role: Battery-aware state machine managing pause/resume on contact bounce and automatic restart after thermal recovery. Use Value: Prevents false termination due to transient disconnection; resumes charging automatically when NTC returns to valid range. | Use Scenario: Professional camcorder battery packs requiring field-replaceable 2-cell modules with strict safety certification. IC Role / Device Role / Timing Role: Safety-critical termination controller enforcing JEITA-compliant charge profiles and overvoltage clamping during motor-induced transients. Use Value: Meets IEC 62133 requirements via hardware-enforced voltage, current, and temperature limits - no firmware dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge termination controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1729CMS8-8.2#PBF | Configured for 8.2V (4.1V/cell) battery voltage; VMAX = 8.5V, VMIN = 5.1V; identical timing, NTC, and pinout | Targeted at legacy 4.1V/cell Li-ion chemistries; not suitable for 4.2V/cell cells due to lower voltage ceiling | Select only if battery pack specifies 4.1V/cell nominal; verify OVP resistor network matches 8.2V setpoint |
| BQ24075RGTR | Integrated linear charger with LDO + termination logic; no external charger IC needed; different topology (no VC control) | Designed for low-power single-cell applications; lacks 2-cell support, NTC hold mode, and high-current (>1A) capability | Use only for compact, low-cost single-cell designs; not a functional replacement for LTC1729CMS8-8.4#PBF in 2-cell or high-current systems |
Compared with LTC1729CMS8-8.2#PBF, the LTC1729CMS8-8.4#PBF provides higher voltage headroom essential for modern 4.2V/cell Li-ion cells, while BQ24075RGTR offers integration at the cost of flexibility, current capability, and multi-cell support - making it unsuitable as a drop-in alternative.
Availability
LTC1729CMS8-8.4#PBF is available at Aetrix Electronics and suitable for cellular phones, PDAs, cradle chargers, and camcorders requiring stable component supply, long-term lifecycle support, and guaranteed traceability for industrial and consumer OEM programs.
Supply support for LTC1729CMS8-8.4#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC1729 series belongs to Linear's precision battery management IC family, designed specifically for autonomous, microcontroller-free Li-ion charge termination in portable equipment with stringent safety and space constraints.
FAQ
What is the primary function of the LTC1729CMS8-8.4#PBF in a battery charging system?
The LTC1729CMS8-8.4#PBF serves as a dedicated hardware-based charge termination controller for 2-cell (8.4V) lithium-ion batteries. Its primary function is to autonomously stop charging after three hours or when the current drops to C/10, using internal comparators, timers, and NTC monitoring - eliminating the need for host processor supervision. The LTC1729CMS8-8.4#PBF does not regulate voltage or current itself but coordinates with external charger ICs like LT1505 or LT1512 via its VC and STATUS pins.
How does the LTC1729CMS8-8.4#PBF handle battery temperature qualification?
The LTC1729CMS8-8.4#PBF uses its NTC pin (Pin 5) with a built-in 100µA current source to bias a 10kΩ NTC thermistor. It monitors voltage thresholds: below 0.405V indicates >50°C (hot hold), above 2.79V indicates <0°C (cold hold), and below 0.2V forces a reset. During hold conditions, the VC pin is pulled low to disable the charger, and timers freeze - ensuring charging only proceeds within 0°C–50°C. This behavior is fully hardware-implemented and requires no software.
Can the LTC1729CMS8-8.4#PBF be used with chargers other than Linear/Analog Devices parts?
Yes, the LTC1729CMS8-8.4#PBF can interface with non-Analog charger ICs, provided they accept an open-drain enable signal on their CE or EN pin (driven by LTC1729CMS8-8.4#PBF's VC pin) and expose a current-sense node compatible with the SENSE pin's 100µA sink. However, full feature compatibility - such as automatic battery detection and seamless OVP coordination - is guaranteed only with documented partners like LT1505, LT1512, and LT1513 per the datasheet.
What happens to the STATUS pin of the LTC1729CMS8-8.4#PBF during different charge states?
The STATUS pin of the LTC1729CMS8-8.4#PBF operates in three distinct modes: (1) Hard pull-down (low impedance) during active charging (IBAT > C/10); (2) Soft 50µA pull-down after C/10 detection is sustained for 3 seconds; (3) High-impedance (open) after 3-hour timer expiry or input removal. This allows microcontrollers to distinguish charging, near-full, and completed states using simple resistor-divider sampling - a key design feature of the LTC1729CMS8-8.4#PBF.
Is the LTC1729CMS8-8.4#PBF pin-compatible with the LTC1729CMS8-4.2#PBF?
Yes, the LTC1729CMS8-8.4#PBF is pin-compatible with the LTC1729CMS8-4.2#PBF - both use the same 8-pin MSOP package and identical pin functions. However, they differ in internal voltage reference trimming: the LTC1729CMS8-8.4#PBF is factory-configured for 8.4V (4.2V/cell × 2), while the LTC1729CMS8-4.2#PBF targets 4.2V single-cell systems. Swapping them requires updating the OVP resistor network and verifying NTC thresholds match the intended battery configuration.
LTC1729CMS8-8.4#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:
- 8.4V
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC1729CMS8-8.4#PBF FAQ
1.How can I place an order for LTC1729CMS8-8.4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1729CMS8-8.4#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 LTC1729CMS8-8.4#PBF reliable?
The price and inventory of LTC1729CMS8-8.4#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1729CMS8-8.4#PBF is usually 5 days.
3.What payment methods are accepted for LTC1729CMS8-8.4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1729CMS8-8.4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1729CMS8-8.4#PBF?
LTC1729CMS8-8.4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1729CMS8-8.4#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 LTC1729CMS8-8.4#PBF?
For technical support, including LTC1729CMS8-8.4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1729CMS8-8.4#PBF requirements.
6.How does Aetrix verify that LTC1729CMS8-8.4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1729CMS8-8.4#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 LTC1729CMS8-8.4#PBF meets industry standards.
7.What is the process for return or replacement of LTC1729CMS8-8.4#PBF?
All LTC1729CMS8-8.4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1729CMS8-8.4#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 LTC1729CMS8-8.4#PBF part is unused and in its original packaging.
Return procedure for LTC1729CMS8-8.4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1729CMS8-8.4#PBF Tags
-
BQ21040DBVR
Texas Instruments
-
MCP73812T-420I/OT
Microchip Technology
-
MCP73831T-2ACI/OT
Microchip Technology
-
MCP73832T-2ACI/OT
Microchip Technology
-
MCP73831T-2DCI/OT
Microchip Technology
-
MCP73832T-2DCI/OT
Microchip Technology
-
MCP73831T-2ATI/OT
Microchip Technology
-
MCP73832T-2ATI/OT
Microchip Technology
-
MCP73831T-5ACI/OT
Microchip Technology
-
MCP73832T-2ACI/MC
Microchip Technology
-
MCP73831T-2ACI/MC
Microchip Technology
-
MCP73831T-2ATI/MC
Microchip Technology
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…
