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Analog Devices Inc. LTC1732EMS-8.4#TRPBF
- Part No.:
- LTC1732EMS-8.4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1732EMS-8.4#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 2CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
LTC1732EMS-8.4 from Analog Devices (formerly Linear Technology) is a complete constant-current/constant-voltage linear battery charger controller for 2-cell (8.4V nominal) lithium-ion batteries. It delivers ±1% float voltage accuracy, programmable charge current up to 500mA with ±7% resistor-based setting, and automatic trickle-charge initiation below 4.9V - used in handheld computing and digital camera charging docks requiring precise, low-component-count Li-Ion management.
For engineers reviewing the LTC1732EMS-8.4 datasheet, LTC1732EMS-8.4 pinout, LTC1732EMS-8.4 application, or LTC1732EMS-8.4 equivalent, key selection concerns include C/10 end-of-charge detection, 10µA sleep-mode battery drain, 8.8–12V input range compatibility with wall adapters, and MSOP-10 footprint constraints for space-constrained portable designs.
Technical Context
The LTC1732EMS-8.4 implements a dual-loop linear control architecture: a current amplifier servoing an external P-channel MOSFET or high-gain PNP pass device via the DRV pin, and a voltage amplifier regulating BAT pin voltage using an internal 2.457V reference and precision resistor divider. Charge termination uses either C/10 current detection (via CHRG pin state change after 15ms delay) or a capacitor-programmable timer on the TIMER pin.
It integrates undervoltage lockout (8.2V threshold with 400mV hysteresis), automatic battery insertion detection (recharge triggered at VBAT < 8.05V), AC adapter presence indication (ACPR open-drain output), and shutdown via PROG pin floating. Sleep mode activates when VCC drops below VBAT + 54mV, reducing battery drain to ≤30µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 8.4V ±1% float voltage - ensures safe full-charge termination for 2-cell Li-Ion without overvoltage stress. |
| Max Charge Current | 500mA typical (RPROG = 19.6kΩ, RSENSE = 0.2Ω) - supports 1C charging of common 500mAh portable batteries. |
| Input Voltage Range | 8.8V to 12V - matches standard 9–12V wall adapters; UVLO disables operation below 8.2V. |
| Sleep Mode Drain | ≤30µA battery current - extends standby time in always-connected dock applications. |
| C/10 Detection Level | 50mA typical (10% of 500mA) - provides reliable end-of-charge signal for host microcontroller monitoring. |
| Recharge Threshold | 8.05V - triggers automatic top-up charge when battery self-discharges below this level. |
| Timer Accuracy | ±10% (CTIMER = 0.1µF) - enables predictable 3-hour full-charge cycle at 1C rate. |
| Operating Temp | –40°C to 85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 10-pin MSOP (3.0mm × 3.0mm × 1.1mm height), exposed pad optional, RoHS-compliant, rated for 140°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery voltage sense input | Connects directly to battery positive; internal 720Ω/35µA divider sets 8.4V regulation point; disconnected in sleep mode to minimize drain. |
| SEL (2) | Function select | Must be tied to VCC - configures device for 2-cell (8.4V) operation; not a user-configurable mode pin. |
| CHRG (3) | Open-drain charge status output | Pulled low during charge; switches to 35µA sink at C/10; floats high-impedance after timer expiry - supports 3-state microcontroller interface. |
| TIMER (4) | Capacitor-based timer input / CV disable | CTIMER to GND sets total charge time; tied to VCC disables timer and forces constant-current-only mode for NiMH/NiCd. |
| GND (5) | Analog/digital ground reference | Common return for all internal circuits and external RSENSE; must be low-impedance connection to minimize sensing error. |
| PROG (6) | Charge current programming / shutdown input | RPROG to GND sets IBAT = (2.457V × 800Ω)/(RPROG × RSENSE); floating disables charger (ICC ≈ 1mA). |
| DRV (7) | External pass device drive output | Sources gate/base current for P-MOSFET or high-gain PNP; no internal FET - requires external power transistor. |
| VCC (8) | Input supply voltage | Accepts 8.8–12V wall adapter input; bypassed with 1µF capacitor; powers all internal circuitry and drives DRV output. |
| SENSE (9) | Current sense input | Connected to RSENSE between VCC and SENSE; senses voltage drop across RSENSE to regulate charge current. |
| ACPR (10) | Wall adapter present indicator | Open-drain output pulled low when VCC > 8.2V and VCC – VBAT > 54mV - drives LED to indicate adapter presence. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% float voltage regulation | Ensures cell-level safety and longevity for 2-cell Li-Ion by tightly bounding final charge voltage at 8.4V. |
| Programmable C/10 end-of-charge detection | Provides unambiguous, delay-filtered (15ms) signal for host system to halt charging without relying on timer alone. |
| Automatic trickle-charge initiation below 4.9V | Enables safe recovery of deeply discharged cells at 10% of full current before transitioning to fast charge. |
| 10µA sleep-mode battery drain | Minimizes parasitic discharge during adapter removal - critical for docked devices left connected for days. |
| AC adapter presence detection (ACPR) | Eliminates need for external voltage monitoring circuitry; simplifies system-level power source awareness. |
| Automatic recharge at 8.05V threshold | Maintains battery at full capacity without host intervention when self-discharge or light load causes voltage sag. |
Applications
| Handheld Computers | Digital Cameras & Camcorders |
|---|---|
|
Use Scenario: Dock-based charging of ruggedized field tablets with removable 2-cell Li-Ion packs. IC Role / Device Role / Timing Role: Linear charger controller managing full-charge cycle, C/10 detection, and automatic top-up when battery voltage drops below 8.05V. Use Value: Eliminates need for microcontroller-based charging firmware while ensuring ±1% voltage accuracy and <30µA standby drain. |
Use Scenario: Integrated charging circuit in DSLR battery grips supporting hot-swap 2-cell Li-Ion packs. IC Role / Device Role / Timing Role: Constant-current/constant-voltage controller with automatic trickle-charge initiation below 4.9V and ACPR-driven adapter status LED. Use Value: Enables rapid 500mA charging with built-in safety thresholds, reducing BOM count versus discrete op-amp solutions. |
| Charging Docks and Cradles | Cellular Phones (Legacy Feature Phones) |
|
Use Scenario: Multi-bay desktop cradle charging up to four 2-cell Li-Ion batteries simultaneously. IC Role / Device Role / Timing Role: Primary charge controller per bay, using TIMER pin capacitor programming for consistent 3-hour full-charge cycles. Use Value: Provides deterministic charge timing and C/10 confirmation without host coordination - essential for unattended overnight charging. |
Use Scenario: Internal linear charger in early 2000s GSM feature phones with replaceable 2-cell Li-Ion batteries. IC Role / Device Role / Timing Role: Standalone charger IC handling full CC/CV profile, automatic sleep on adapter removal, and CHRG-led status feedback. Use Value: Delivers certified Li-Ion safety compliance (UL/IEC 62133) with minimal external components - critical for compact phone PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1731CMS-4.2#PBF | Single-cell (4.2V) fixed output; identical MSOP-10 package and pinout except SEL pin unused. | Designed for 1-cell Li-Ion only; cannot regulate 8.4V without external resistor network modification. | Select only if migrating to single-cell battery architecture; not drop-in compatible for 2-cell systems. |
| LTC4053EDD#TRPBF | USB/wall-input dual-source capable; includes thermal regulation and 500mA max current; 10-pin DFN (3×3mm), not pin-compatible. | Supports USB 100/500mA profiles and thermal foldback - suited for portable devices with dual-input requirements. | Choose when USB charging capability or thermal feedback is required; requires PCB layout revision due to DFN package. |
Compared with LTC1731CMS-4.2#PBF and LTC4053EDD#TRPBF, the LTC1732EMS-8.4 uniquely combines 2-cell-specific 8.4V regulation, MSOP-10 footprint, and zero-firmware C/10 + timer dual-termination - making it optimal for cost-sensitive, space-constrained 2-cell docked chargers where USB input is unnecessary.
Availability
LTC1732EMS-8.4 is available at Aetrix Electronics and suitable for handheld computers, digital cameras and camcorders, and charging docks and cradles requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1732EMS-8.4 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 its high-performance analog IC portfolio, including precision power management solutions for demanding industrial and portable applications.
The LTC1732EMS-8.4 belongs to Linear's legacy linear battery charger controller family, designed specifically for low-component-count, firmware-free charging of multi-cell Li-Ion batteries in space-constrained consumer and industrial docked systems.
FAQ
What is the exact float voltage setpoint of the LTC1732EMS-8.4, and how is it trimmed?
The LTC1732EMS-8.4 has a factory-trimmed float voltage of 8.4V with ±1% accuracy over –40°C to 85°C. This is achieved using an internal 2.457V precision reference and a matched 720Ω/35µA resistor divider network connected to the BAT pin - no external components are required to achieve this specification. The LTC1732EMS-8.4 does not support adjustment of this voltage; it is fixed for 2-cell Li-Ion compliance.
Can the LTC1732EMS-8.4 charge NiMH or NiCd batteries, and if so, how is termination handled?
Yes, the LTC1732EMS-8.4 can charge NiMH or NiCd batteries in constant-current-only mode by connecting the TIMER pin to VCC. In this mode, the voltage amplifier, C/10 comparator, and trickle-charge functions are disabled. Termination must be implemented externally - for example, via –ΔV detection, temperature cutoff, or absolute timer - because the LTC1732EMS-8.4 provides no built-in NiMH/NiCd termination logic.
What is the minimum recommended RSENSE value for the LTC1732EMS-8.4, and why?
The LTC1732EMS-8.4 requires RSENSE ≥ 0.2Ω for stable operation and specified accuracy. Lower values increase sensitivity to noise and PCB trace resistance, degrading current regulation. At 500mA full-scale current, 0.2Ω yields a 100mV sense voltage - matching the internal current amplifier's optimal operating range. Using RSENSE < 0.2Ω may cause excessive gain error and thermal drift, violating the ±7% charge current accuracy spec of the LTC1732EMS-8.4.
How does the LTC1732EMS-8.4 detect and respond to battery insertion while powered?
The LTC1732EMS-8.4 monitors BAT pin voltage continuously. If a new battery with VBAT < 8.05V is inserted while VCC is applied, the device resets the internal timer and initiates a new full charge cycle - including trickle-charge if VBAT < 4.9V. If VBAT ≥ 8.05V, charging continues without reset. This behavior enables seamless hot-swap capability in docking stations, and is intrinsic to the LTC1732EMS-8.4's analog control architecture.
What is the maximum allowable input voltage for the LTC1732EMS-8.4, and what happens beyond that limit?
The absolute maximum input voltage (VCC) for the LTC1732EMS-8.4 is 13.2V. Exceeding this risks permanent damage per Absolute Maximum Ratings. Operation above 12V (the upper limit of the recommended range) degrades thermal performance and may trigger internal protection circuits unpredictably. For reliable 8.8–12V operation, a 1µF ceramic bypass capacitor (X5R/X7R dielectric) is mandatory at the VCC pin - as specified in the LTC1732EMS-8.4 datasheet.
LTC1732EMS-8.4#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 2
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- 585mA
- Battery Pack Voltage:
- 8.4V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1732EMS-8.4#TRPBF FAQ
1.How can I place an order for LTC1732EMS-8.4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1732EMS-8.4#TRPBF 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 LTC1732EMS-8.4#TRPBF reliable?
The price and inventory of LTC1732EMS-8.4#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1732EMS-8.4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1732EMS-8.4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1732EMS-8.4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1732EMS-8.4#TRPBF?
LTC1732EMS-8.4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1732EMS-8.4#TRPBF 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 LTC1732EMS-8.4#TRPBF?
For technical support, including LTC1732EMS-8.4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1732EMS-8.4#TRPBF requirements.
6.How does Aetrix verify that LTC1732EMS-8.4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1732EMS-8.4#TRPBF 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 LTC1732EMS-8.4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1732EMS-8.4#TRPBF?
All LTC1732EMS-8.4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1732EMS-8.4#TRPBF, 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 LTC1732EMS-8.4#TRPBF part is unused and in its original packaging.
Return procedure for LTC1732EMS-8.4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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