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Analog Devices Inc. LTC1732EMS-4#TRPBF
- Part No.:
- LTC1732EMS-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1732EMS-4#TRPBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,219
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Product details
Overview
LTC1732EMS-4#TRPBF from Analog Devices (formerly Linear Technology) is a 4.1V fixed-output, constant-current/constant-voltage linear lithium-ion battery charger controller in a 10-pin MSOP package. It delivers ±1% float voltage accuracy, programmable charge current (e.g., 500mA with RPROG = 19.6kΩ and RSENSE = 0.2Ω), and automatic trickle charge for cells below 2.457V - used in handheld computing devices requiring compact, low-quiescent-power charging.
For engineers reviewing the LTC1732EMS-4#TRPBF datasheet, LTC1732EMS-4#TRPBF pinout, LTC1732EMS-4#TRPBF application, or LTC1732EMS-4#TRPBF equivalent, key selection criteria include 4.1V vs. 4.2V cell compatibility, C/10 end-of-charge detection, programmable timer termination, and 7µA sleep-mode battery drain - all confirmed for this exact variant.
Technical Context
The LTC1732EMS-4#TRPBF implements a precision analog control loop: an internal 2.457V reference drives a current amplifier that servo-controls an external P-channel MOSFET via the DRV pin to regulate charge current through RSENSE; simultaneously, a voltage amplifier compares BAT voltage against a factory-trimmed resistor divider to enforce 4.1V float regulation. The SEL pin is internally grounded to fix output at 4.1V per cell.
Charge sequencing is fully autonomous: upon VCC application (>4.1V), it initiates trickle charge if VBAT < 2.457V, transitions to constant-current mode above that threshold, then enters constant-voltage mode as VBAT approaches 4.1V; termination occurs either at C/10 current level (50mA for 500mA full-scale) or after timeout set by CTIMER, with automatic recharge triggered when VBAT drops below 3.8V while connected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Float Voltage | 4.1V ±1% - precisely regulates single-cell Li-ion battery terminal voltage during CV phase |
| Charge Current Accuracy | ±7% max - determined by RPROG and RSENSE tolerance; enables reliable 500mA programming with 19.6kΩ/0.2Ω |
| Sleep Mode Battery Drain | 7µA typical - minimizes self-discharge when input supply is removed, extending standby time |
| C/10 Detection Threshold | 50mA (for 500mA full-scale) - signals near-full charge via CHRG pin state change after 15ms debounce |
| Recharge Threshold | 3.8V - triggers new charge cycle automatically if battery voltage falls below this due to load or self-discharge |
| Input Voltage Range | 4.5V to 12V - supports common wall adapters and USB-powered systems with ≥54mV dropout margin |
| Operating Temperature | –40°C to +85°C - qualified for industrial and portable consumer environments |
Pinout & Package
Package: 10-pin MSOP (MS10), 3.0mm × 3.0mm × 1.1mm body, exposed pad optional, RoHS-compliant, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery voltage sense input | Connects to battery anode; internal 720Ω/35µA divider sets 4.1V float point; bypass capacitor ≥10µF required for stability |
| SEL (2) | 4.1V/4.2V selection input | Internally grounded for LTC1732EMS-4#TRPBF - fixes float voltage at 4.1V; no external connection needed |
| CHRG (3) | Open-drain charge status output | Pulled low during CC/CV charge; switches to 35µA sink at C/10; high-impedance after timer expiry or shutdown |
| TIMER (4) | Timer capacitor and CV disable input | CTIMER sets total charge time (t = 3h × C/0.1µF); tied to VCC disables timer and forces CC-only mode |
| GND (5) | Analog and power ground reference | Common return for internal amplifiers, comparators, and external RSENSE; must be low-impedance |
| PROG (6) | Charge current program and shutdown input | RPROG to GND sets IBAT = (2.457V × 800Ω)/(RPROG × RSENSE); floating enables shutdown (ICC = 1mA) |
| DRV (7) | External pass device drive output | Sources gate/base drive for P-MOSFET or PNP; requires high-beta transistor if using BJT to minimize base current error |
| VCC (8) | Positive input supply input | 4.5V–12V range; UVLO activates at 4.1V with 200mV hysteresis; bypass with 1µF ceramic capacitor |
| SENSE (9) | Current sense input | Connected to RSENSE between VCC and SENSE; senses voltage drop to regulate IBAT; high-impedance input |
| ACPR (10) | Wall adapter present indicator | Open-drain output pulled low when VCC > 4.1V and VCC – VBAT > 54mV - drives LED without external driver |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.1V float voltage | Guarantees safe charging of legacy 4.1V Li-ion cells with ±1% accuracy over temperature and line |
| Automatic trickle-to-CC transition | Enables recovery of deeply discharged cells (<2.457V) at 10% full-scale current before fast charging |
| Programmable C/10 end-of-charge detection | Provides precise, noise-immune signal (15ms debounced) indicating ~99% state-of-charge without timer dependency |
| Low-power sleep mode | Drops battery drain to 7µA when input is removed - critical for long-term battery backup applications |
| Integrated ACPR wall-adapter detect | Eliminates need for external comparator or microcontroller GPIO to monitor power source presence |
Applications
| Handheld Computers | Charging Docks & Cradles |
|---|---|
Use Scenario: Portable tablet or ruggedized PDA with removable Li-ion battery requiring autonomous, low-heat charging without host MCU intervention. IC Role / Device Role / Timing Role: Standalone linear charger controller managing CC/CV profile, C/10 detection, and automatic recharge at 3.8V threshold. Use Value: Enables compact, fanless design with <7µA battery drain in sleep mode and ±1% voltage regulation for cell longevity. |
Use Scenario: Desktop cradle that charges multiple handheld devices simultaneously via dedicated ports with independent status indication. IC Role / Device Role / Timing Role: Primary charge controller per port, using CHRG and ACPR pins to drive LEDs for real-time charge status and adapter presence feedback. Use Value: Reduces BOM count by integrating timer, comparator, and voltage reference - no external components needed beyond RPROG/RSENSE. |
| Cellular Phones (Legacy) | Industrial Portable Instruments |
Use Scenario: Early-generation GSM smartphones with single-cell 4.1V Li-ion packs and space-constrained PCB layouts. IC Role / Device Role / Timing Role: Linear charging controller providing precise 4.1V float, automatic trickle recovery, and C/10 termination without software overhead. Use Value: Eliminates need for complex switching charger ICs or firmware-based charge management in cost-sensitive designs. |
Use Scenario: Battery-powered field meter or data logger operating in wide temperature ranges (–40°C to +85°C) with infrequent recharging cycles. IC Role / Device Role / Timing Role: Robust, analog-based charger ensuring reliable cell conditioning and low standby loss across environmental extremes. Use Value: Maintains ±1% voltage accuracy and 7µA sleep current even at –40°C, preserving battery capacity during extended storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion linear charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1732EMS-4.2#TRPBF | Fixed 4.2V float voltage; 4.05V recharge threshold; SEL pin must be tied to VCC | Designed for modern 4.2V Li-ion cells; not suitable for 4.1V cells due to higher recharge threshold | Select only when charging standard 4.2V cells - incompatible with 4.1V chemistry due to 4.05V vs. 3.8V recharge mismatch |
| LTC4053EDD#TRMPBF | 4.2V fixed output; integrated MOSFET; 500mA max; thermal regulation; smaller 8-pin DFN package | Higher integration (no external pass FET), lower max current, no programmable timer or C/10 output | Choose for space-constrained, lower-power designs where integrated FET and thermal foldback are preferred over discrete control flexibility |
Compared with LTC1732EMS-4#TRPBF, the LTC1732EMS-4.2#TRPBF offers higher float voltage but lacks backward compatibility with 4.1V cells, while the LTC4053EDD#TRMPBF trades external component flexibility for smaller footprint and built-in thermal protection - making LTC1732EMS-4#TRPBF optimal for legacy 4.1V systems needing full analog control.
Availability
LTC1732EMS-4#TRPBF is available at Aetrix Electronics and suitable for handheld computers, charging docks and cradles, and industrial portable instruments requiring stable component supply, long-lifecycle support, and guaranteed performance across –40°C to +85°C.
Supply support for LTC1732EMS-4#TRPBF 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 precision analog portfolio, renowned for high-performance power management ICs with industry-leading accuracy and reliability.
The LTC1732EMS-4#TRPBF belongs to Linear's legacy lithium-ion linear charger controller family, designed specifically for compact, low-noise, thermally efficient charging of single-cell 4.1V Li-ion batteries in portable electronics without microcontroller dependency.
FAQ
What is the exact float voltage programmed into the LTC1732EMS-4#TRPBF?
The LTC1732EMS-4#TRPBF is factory-configured for a 4.1V float voltage with ±1% accuracy over temperature and line conditions. This is achieved via internal resistor trimming and is fixed - no external configuration is required. The SEL pin is internally grounded, distinguishing it from the 4.2V LTC1732EMS-4.2#TRPBF variant. This 4.1V setting ensures safe, long-life charging of legacy lithium-ion cells rated for 4.1V maximum.
Can the LTC1732EMS-4#TRPBF be used to charge 4.2V lithium-ion cells?
Yes, the LTC1732EMS-4#TRPBF can charge 4.2V lithium-ion cells, but only when the SEL pin is externally tied to VCC - which overrides the internal 4.1V default and enables 4.2V regulation. However, doing so changes the recharge threshold from 3.8V to 4.05V, potentially causing premature recharging or reduced cycle life. For consistent 4.2V operation, Analog Devices recommends the LTC1732EMS-4.2#TRPBF instead.
How does the LTC1732EMS-4#TRPBF handle deeply discharged batteries?
The LTC1732EMS-4#TRPBF automatically initiates trickle charge when VBAT is below 2.457V, delivering 10% of the programmed full-scale current (e.g., 50mA for a 500mA system) until the cell voltage rises above that threshold. If the low-voltage condition persists for one quarter of the total timer duration, the IC terminates charging and places the CHRG pin in high-impedance state - indicating a potentially defective cell.
What is the function of the ACPR pin on the LTC1732EMS-4#TRPBF?
The ACPR (Adapter Present) pin on the LTC1732EMS-4#TRPBF is an open-drain output that pulls low when two conditions are met: VCC exceeds 4.1V (UVLO threshold) and VCC – VBAT > 54mV. This provides direct, hardware-level confirmation that a valid wall adapter is connected and capable of sustaining charging - enabling simple LED indication without MCU polling or external comparators.
Does the LTC1732EMS-4#TRPBF require external compensation components?
No, the LTC1732EMS-4#TRPBF is internally compensated and stable with a P-channel MOSFET pass device and battery connected. A 10µF tantalum or low-ESR ceramic capacitor (with optional 1Ω series resistor for ceramics) at the BAT pin is recommended for ripple suppression when the battery is disconnected. No external compensation network is needed for standard linear configurations.
LTC1732EMS-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:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- 585mA
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC1732EMS-4#TRPBF FAQ
1.How can I place an order for LTC1732EMS-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1732EMS-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-4#TRPBF reliable?
The price and inventory of LTC1732EMS-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-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1732EMS-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1732EMS-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1732EMS-4#TRPBF?
LTC1732EMS-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1732EMS-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-4#TRPBF?
For technical support, including LTC1732EMS-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1732EMS-4#TRPBF requirements.
6.How does Aetrix verify that LTC1732EMS-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1732EMS-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-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1732EMS-4#TRPBF?
All LTC1732EMS-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1732EMS-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-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC1732EMS-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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