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Analog Devices Inc. LTC1732EMS-4.2#PBF
- Part No.:
- LTC1732EMS-4.2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1732EMS-4.2#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LTC1732EMS-4.2#PBF from Analog Devices (formerly Linear Technology) is a precision linear battery charger controller for single-cell 4.2V lithium-ion batteries. It delivers constant-current/constant-voltage charging with 1% float voltage accuracy, 7% charge current programming accuracy via external resistors, and automatic C/10 termination detection - used in handheld computing devices requiring reliable, low-heat battery management.
For engineers reviewing the LTC1732EMS-4.2#PBF datasheet, LTC1732EMS-4.2#PBF pinout, LTC1732EMS-4.2#PBF application, or LTC1732EMS-4.2#PBF equivalent, key selection considerations include its 4.05V recharge threshold, 4.5V–12V input range, 7µA sleep-mode battery drain, MSOP-10 package compatibility, and SEL-pin–forced 4.2V float voltage configuration.
Technical Context
The LTC1732EMS-4.2#PBF implements a dual-loop analog control architecture: a current amplifier servoing an external P-channel MOSFET gate to regulate charge current via RSENSE/RPROG, and a voltage amplifier with internal 2.457V reference and precision resistor divider to maintain ±1% float voltage regulation at the BAT pin. Its C/10 comparator and programmable timer (via CTIMER) provide independent charge termination paths.
It features integrated functions including automatic trickle charge initiation below 2.457V, VCC undervoltage lockout (4.1V threshold with 200mV hysteresis), wall adapter presence detection (ACPR), and battery insertion sensing. The SEL pin is hardwired to VCC per datasheet specification, fixing float voltage at 4.2V and recharge threshold at 4.05V - distinguishing it from the LTC1732-4 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 4.2V ±1% - precisely regulated float voltage for Li-Ion cells; fixed by SEL = VCC configuration. |
| Recharge Threshold | 4.05V - triggers new charge cycle when battery voltage drops below this level under load or self-discharge. |
| Input Voltage Range | 4.5V to 12V - supports common wall adapters; includes 4.1V UVLO with 200mV hysteresis. |
| Charge Current Accuracy | ±7% - achieved via external RPROG and RSENSE; e.g., 500mA typical with RPROG = 19.6kΩ, RSENSE = 0.2Ω. |
| Sleep Mode Drain | 7µA - minimizes battery self-discharge when input supply is removed. |
| Trickle Charge Threshold | 2.457V - initiates 10% full-scale current pre-charge for deeply discharged cells. |
| Timer Accuracy | ±10% - sets total charge time via external CTIMER capacitor (tTIMER = 3h × CTIMER/0.1µF). |
Pinout & Package
Package: 10-pin MSOP (MS10), 3mm × 3mm × 0.85mm body, exposed pad optional, RoHS-compliant (Pb-free #PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery voltage sense input | Connects to battery anode; internal 720Ω/35µA divider sets 4.2V float; bypassed with ≥10µF capacitor for stability. |
| SEL (2) | Voltage selection control | Must be tied to VCC to configure 4.2V float and 4.05V recharge threshold; not floating or grounded. |
| CHRG (3) | Open-drain charge status output | Pulled low during fast charge; switches to 35µA sink at C/10; high-impedance after timer expiry or shutdown. |
| TIMER (4) | Timer capacitor & CV disable input | CTIMER to GND sets charge duration; tied to VCC disables timer and forces constant-current-only mode. |
| GND (5) | Analog/digital ground reference | Common return for all internal circuits; requires low-impedance connection to system ground plane. |
| PROG (6) | Charge current programming & shutdown input | RPROG to GND sets IBAT = (2.457V × 800Ω)/(RPROG × RSENSE); floating enables shutdown (ICC = 1mA). |
| DRV (7) | External pass device drive output | Drives gate of P-channel MOSFET or base of PNP transistor; requires external pull-up for PNP use. |
| VCC (8) | Positive input supply | 4.5V–12V wall adapter input; bypassed with 1µF ceramic capacitor; triggers sleep mode if VCC – VBAT < 54mV. |
| SENSE (9) | Current sense input | Connected to RSENSE between VCC and SENSE; senses voltage drop to regulate charge current. |
| ACPR (10) | Wall adapter present indicator | Open-drain output pulled low when VCC > 4.1V and VCC – VBAT > 54mV; sinks 5mA for LED drive. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.2V float voltage with 1% accuracy | Enables safe, compliant charging of standard Li-Ion cells without external feedback components. |
| 4.05V automatic recharge threshold | Ensures battery re-enters charge cycle when voltage drops due to load or self-discharge - critical for always-on portable systems. |
| 7µA sleep-mode battery drain | Extends standby time in battery-backed applications by minimizing quiescent current when no input power is present. |
| Integrated C/10 end-of-charge detection | Provides precise, real-time signal (via CHRG pin) that battery is near full capacity - enabling host microcontroller coordination. |
| Programmable timer with ±10% accuracy | Offers fail-safe charge termination independent of voltage/current sensing - essential for safety-critical designs. |
| Trickle charge initiation at 2.457V | Protects deeply discharged cells by limiting initial current to 10% of programmed value until safe voltage is reached. |
Applications
| Handheld Computers | Cellular Phones |
|---|---|
|
Use Scenario: Portable Windows CE or Android-based PDAs with removable Li-Ion packs requiring compact, thermally efficient charging. IC Role / Device Role / Timing Role: Linear charger controller managing CC/CV profile, C/10 signaling, and automatic recharge on voltage sag. Use Value: Eliminates need for discrete op-amps and comparators; achieves <1°C temperature rise at 500mA due to optimized thermal design in MSOP-10. |
Use Scenario: Feature phones with single-cell 4.2V Li-Ion batteries and space-constrained PCB layouts. IC Role / Device Role / Timing Role: Primary battery management IC providing float regulation, ACPR wall-adapter detection, and CHRG status reporting to baseband processor. Use Value: Reduces bill-of-materials count by integrating timer, comparator, reference, and logic - enabling sub-10mm² charger footprint. |
| Charging Docks | Medical Handheld Monitors |
|
Use Scenario: Desktop cradles for barcode scanners or rugged tablets that must initiate charging upon device insertion. IC Role / Device Role / Timing Role: Battery interface controller detecting battery presence, initiating trickle-to-CC transition, and signaling full charge via CHRG pin. Use Value: Supports hot-swap battery insertion with automatic timer reset and 4.05V recharge - ensuring consistent charge cycles across repeated dock/undock events. |
Use Scenario: Battery-powered ECG or pulse oximetry devices requiring long shelf life and guaranteed charge reliability. IC Role / Device Role / Timing Role: Safety-critical charger enforcing strict 4.2V float tolerance, 7µA sleep drain, and dual-termination (C/10 + timer) for regulatory compliance. Use Value: Meets IEC 62368-1 thermal limits and provides traceable end-of-charge signaling for firmware logging and diagnostics. |
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#PBF | Fixed 4.1V float voltage; 3.8V recharge threshold; SEL pin grounded. | Designed for legacy 4.1V Li-Ion cells; not suitable for standard 4.2V cells. | Select only when replacing older 4.1V battery chemistries or maintaining backward compatibility. |
| LTC4053EDD#TRPBF | Integrated MOSFET (no external pass device); 4.2V float; 100mA max charge current; 10-pin DFN package. | Lower power, space-constrained applications; lacks programmable timer and C/10 output. | Choose for ultra-compact, low-current designs where external FET drive and advanced termination are unnecessary. |
Compared with LTC1732EMS-4#PBF, the LTC1732EMS-4.2#PBF ensures correct 4.2V cell regulation and prevents undercharging, while the LTC4053EDD#TRPBF trades external component flexibility for integration and smaller footprint - making it suitable only for ≤100mA applications without timer-based safety backup.
Availability
LTC1732EMS-4.2#PBF is available at Aetrix Electronics and suitable for handheld computers, cellular phones, and charging docks requiring stable component supply, long-term manufacturability, and automotive-grade reliability under industrial temperature conditions.
Supply support for LTC1732EMS-4.2#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 technical support, documentation, and manufacturing continuity for all Linear-branded products including the LTC1732 series.
The LTC1732EMS-4.2#PBF belongs to Linear's precision analog power management product line, designed specifically for thermally constrained, single-cell Li-Ion charging applications demanding high voltage accuracy and robust fault handling.
FAQ
What is the exact float voltage set by LTC1732EMS-4.2#PBF, and how is it enforced?
The LTC1732EMS-4.2#PBF delivers a precisely regulated 4.2V float voltage at the BAT pin with ±1% accuracy over temperature and line. This is achieved using an internal 2.457V bandgap reference, a trimmed 720Ω resistor divider, and a voltage amplifier - all fixed by the SEL pin being tied to VCC per datasheet requirement. No external feedback components are needed.
Can LTC1732EMS-4.2#PBF be used with 4.1V lithium-ion cells?
No - the LTC1732EMS-4.2#PBF is configured exclusively for 4.2V cells. Its SEL pin must be connected to VCC, fixing the float voltage at 4.2V and the recharge threshold at 4.05V. Using it with 4.1V cells risks overvoltage stress and reduced cycle life. For 4.1V cells, LTC1732EMS-4#PBF (SEL = GND) is the correct variant.
How does LTC1732EMS-4.2#PBF handle deeply discharged batteries?
The LTC1732EMS-4.2#PBF automatically initiates trickle charge when the BAT pin voltage falls below 2.457V, delivering 10% of the programmed full-scale current until the cell reaches a safe voltage. If the low-voltage condition persists for one quarter of the total timer period, the device terminates charging and places the CHRG pin in high-impedance state - indicating potential cell failure.
What is the function of the ACPR pin on LTC1732EMS-4.2#PBF?
The ACPR (Adapter Present) pin on LTC1732EMS-4.2#PBF is an open-drain output that pulls low when two conditions are met: VCC exceeds 4.1V (UVLO threshold) and VCC – VBAT > 54mV. It can directly drive an LED to indicate valid wall adapter presence - eliminating need for external monitoring circuitry in docking station or cradle applications.
Does LTC1732EMS-4.2#PBF support constant-current-only charging for NiMH batteries?
Yes - connecting the TIMER pin to VCC disables both the timer and voltage amplifier, forcing the LTC1732EMS-4.2#PBF into constant-current-only mode. In this configuration, it operates as a programmable current source suitable for NiMH/NiCd charging, but external termination (e.g., voltage cutoff or ΔV detection) must be implemented since C/10 and timer functions are disabled.
LTC1732EMS-4.2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-4.2#PBF FAQ
1.How can I place an order for LTC1732EMS-4.2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1732EMS-4.2#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 LTC1732EMS-4.2#PBF reliable?
The price and inventory of LTC1732EMS-4.2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1732EMS-4.2#PBF is usually 5 days.
3.What payment methods are accepted for LTC1732EMS-4.2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1732EMS-4.2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1732EMS-4.2#PBF?
LTC1732EMS-4.2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1732EMS-4.2#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 LTC1732EMS-4.2#PBF?
For technical support, including LTC1732EMS-4.2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1732EMS-4.2#PBF requirements.
6.How does Aetrix verify that LTC1732EMS-4.2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1732EMS-4.2#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 LTC1732EMS-4.2#PBF meets industry standards.
7.What is the process for return or replacement of LTC1732EMS-4.2#PBF?
All LTC1732EMS-4.2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1732EMS-4.2#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 LTC1732EMS-4.2#PBF part is unused and in its original packaging.
Return procedure for LTC1732EMS-4.2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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