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Analog Devices Inc. LTC1732EMS-4#PBF
- Part No.:
- LTC1732EMS-4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1732EMS-4#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,531
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Product details
Overview
LTC1732EMS-4#PBF from Analog Devices (formerly Linear Technology) is a single-cell lithium-ion linear battery charger controller with 4.1V float voltage, ±1% voltage regulation accuracy, 7µA sleep-mode battery drain current, and programmable charge current via external RPROG/RSENSE. It integrates C/10 end-of-charge detection, automatic trickle charge for low-voltage cells (<2.457V), and SEL-pin-selectable 4.1V/4.2V operation - used in handheld computers and charging cradles.
For engineers reviewing the LTC1732EMS-4#PBF datasheet, LTC1732EMS-4#PBF pinout, LTC1732EMS-4#PBF application, or LTC1732EMS-4#PBF equivalent, key selection considerations include its 10-pin MSOP package, 4.5V–12V input range, 3.8V recharge threshold, internal 2.457V reference, and compatibility with external P-channel MOSFET or PNP pass transistors.
Technical Context
The LTC1732EMS-4#PBF implements a dual-loop linear control architecture: a current amplifier (CA) servoing the DRV pin to regulate charge current via RSENSE, and a voltage amplifier (VA) controlling the same loop to enforce constant-voltage float at BAT. Its internal 2.457V reference feeds both loops with trimmed 800Ω resistor and precision divider.
Charge sequencing is fully autonomous: automatic trickle mode below 2.457V, transition to constant-current at 500mA (with RPROG=19.6kΩ/RSENSE=0.2Ω), then constant-voltage taper until C/10 detection (50mA), all governed by an external TIMER capacitor or VCC-sourced disable signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Float Voltage | 4.1V per cell (SEL = GND); ±1% accuracy ensures safe Li-Ion termination without overvoltage stress. |
| Input Voltage Range | 4.5V to 12V - supports standard wall adapters and enables robust operation across varying supply conditions. |
| Sleep Mode Current | 7µA battery drain - minimizes self-discharge during standby, extending host device shelf life. |
| Trickle Threshold | 2.457V (min 2.35V, max 2.55V) - initiates safe pre-charge for deeply discharged cells before full-rate charging. |
| C/10 Detection | 50mA typical (25–100mA range) - signals near-full charge state for system-level status indication or safety cutoff. |
| Recharge Threshold | 3.8V - triggers new charge cycle when battery voltage drops due to load or self-discharge, maintaining optimal state-of-charge. |
| Undervoltage Lockout | 4.1V with 200mV hysteresis - prevents erratic operation during brownout and ensures clean startup. |
Pinout & Package
Package: 10-pin MSOP (3mm × 3mm, 0.5mm pitch), thermally enhanced for linear regulator power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery voltage sense input | Connects to battery anode; internal 720Ω/35µA divider sets 4.1V float; bypassed with ≥10µF for stability when battery disconnected. |
| SEL (2) | Voltage selection control | GND = 4.1V float; VCC = 4.2V float - configures for specific Li-Ion chemistry without external logic. |
| CHRG (3) | Open-drain charge status output | Pulled low during charge; weak 35µA sink at C/10; high-Z after timer expiry - enables 3-state microcontroller interface. |
| TIMER (4) | Timer capacitor & CV disable | CTIMER sets total charge time (t = 3h × CTIMER/0.1µF); tied to VCC disables timer and forces CC-only mode. |
| GND (5) | Analog/digital ground reference | Common return for all internal amplifiers, comparators, and current sources - must be low-impedance connection. |
| PROG (6) | Charge current programming & shutdown | RPROG to GND sets IBAT = (2.457V × 800Ω)/(RPROG × RSENSE); floating disables IC (ICC = 1mA). |
| DRV (7) | External pass transistor gate/base drive | Drives P-MOSFET gate or PNP base; requires high-beta PNP for <1.6% current error in transistor-based designs. |
| VCC (8) | Positive input supply | 4.5–12V input; internal UVLO (4.1V) and sleep mode activation (VCC–VBAT < 54mV) - bypass with 1µF ceramic. |
| SENSE (9) | Current sense input | Connected to RSENSE between VCC and SENSE; senses voltage drop to close current loop - critical for accuracy. |
| ACPR (10) | Wall adapter present indicator | Open-drain N-MOSFET sinks 5mA when VCC > UVLO and VCC–VBAT > 54mV - drives LED without external driver. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-restart on battery insertion | Resets timer and initiates new charge cycle if VBAT < 3.8V - enables hot-swap battery replacement in portable systems. |
| Programmable constant-current mode | Disable timer (TIMER = VCC) to operate as standalone NiMH/NiCd current source - eliminates need for external termination logic. |
| Integrated trickle charge | 10% of programmed current applied below 2.457V - prevents lithium plating on deeply discharged cells while avoiding false C/10 triggers. |
| Low-power sleep mode | 7µA battery drain with VCC removed - preserves battery capacity during storage or transport without manual disconnect. |
| AC presence detection | Dedicated ACPR pin outputs active-low signal when adapter is connected and valid - simplifies power-path management in docked systems. |
Applications
| Handheld Computers | Charging Docks and Cradles |
|---|---|
Use Scenario: Portable industrial tablet recharges via USB-powered dock while running diagnostics. IC Role / Device Role / Timing Role: LTC1732EMS-4#PBF acts as primary linear charge controller, regulating 4.1V float and detecting C/10 to signal full charge to host MCU. Use Value: 7µA sleep current extends idle battery life; SEL pin allows firmware-controlled voltage selection for mixed-battery fleets. | Use Scenario: Medical handheld device docks overnight in a multi-unit charging station with shared wall adapter. IC Role / Device Role / Timing Role: LTC1732EMS-4#PBF manages individual cell charging per slot, using ACPR to confirm adapter presence and CHRG for per-slot status reporting. Use Value: 3.8V recharge threshold ensures consistent top-up cycles; MSOP package enables dense multi-channel PCB layout. |
| Smartphone Accessories | Portable Diagnostic Tools |
Use Scenario: Compact Bluetooth headset case provides on-the-go charging with integrated Li-Ion cell. IC Role / Device Role / Timing Role: LTC1732EMS-4#PBF controls linear charge path with DRV driving small P-MOSFET, using TIMER capacitor for fixed 3-hour safety timeout. Use Value: No external op-amps or comparators needed - reduces BOM count and layout area in space-constrained enclosures. | Use Scenario: Field-deployable ECG monitor uses replaceable battery pack charged via vehicle cigarette lighter (12V input). IC Role / Device Role / Timing Role: LTC1732EMS-4#PBF handles 12V-to-4.1V conversion with UVLO hysteresis preventing restart glitches during engine cranking. Use Value: 4.5V–12V input range accommodates automotive transients; 54mV sleep enable threshold ensures zero parasitic drain when unplugged. |
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#PBF | Fixed 4.2V float voltage; 4.05V recharge threshold; SEL pin must be tied to VCC. | Designed for standard 4.2V Li-Ion cells only - not suitable for 4.1V chemistries or mixed-voltage systems. | Select when precise 4.2V termination is required and no voltage flexibility is needed. |
| LTC4054-4.2ES5#TRMPBF | 5-pin SOT-23 package; fixed 4.2V output; no SEL pin; integrated thermal regulation; 500mA max current. | Lacks timer, C/10 output, and trickle charge - intended for simpler, lower-cost applications without advanced status signaling. | Choose for space-constrained designs where basic charge control suffices and microcontroller status feedback is unnecessary. |
Compared with LTC1732EMS-4.2#PBF, the LTC1732EMS-4#PBF offers voltage selectability and broader recharge compatibility; versus LTC4054-4.2ES5#TRMPBF, it delivers richer system integration (C/10, ACPR, TIMER) at the cost of larger footprint and higher component count.
Availability
LTC1732EMS-4#PBF is available at Aetrix Electronics and suitable for handheld computers, charging docks and cradles, and portable diagnostic tools requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1732EMS-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 its high-performance analog IC portfolio, emphasizing precision, reliability, and application-specific integration for industrial and portable power systems.
The LTC1732EMS-4#PBF belongs to Linear's legacy battery management product line, designed specifically for compact, low-noise linear charging of single-cell Li-Ion batteries in resource-constrained portable electronics.
FAQ
What is the exact float voltage accuracy of the LTC1732EMS-4#PBF?
The LTC1732EMS-4#PBF delivers ±1% float voltage accuracy at 4.1V per cell over the full –40°C to 85°C operating temperature range, achieved via an internal 2.457V reference, precision resistor divider, and trimmed 800Ω programming element - verified in the Electrical Characteristics table under VBAT parameter.
How does the LTC1732EMS-4#PBF enter and exit sleep mode?
The LTC1732EMS-4#PBF enters sleep mode automatically when the input supply (VCC) is removed or when VCC drops below 4.1V (UVLO), reducing battery drain to 7µA. It exits sleep mode when VCC rises above 4.1V and a valid program resistor is connected to PROG - confirmed by the Sleep Mode (Battery Drain Current) specification and OPERATING section.
Can the LTC1732EMS-4#PBF charge NiMH batteries, and how is termination handled?
Yes, the LTC1732EMS-4#PBF can charge NiMH batteries by connecting the TIMER pin to VCC to disable constant-voltage mode and operate in constant-current-only mode. Termination requires external methods - such as voltage delta-V detection or temperature monitoring - since the internal C/10 and timer functions are disabled in this configuration.
What is the function of the ACPR pin on the LTC1732EMS-4#PBF?
The ACPR pin on the LTC1732EMS-4#PBF is an open-drain output that pulls low when both conditions are met: VCC exceeds the 4.1V undervoltage lockout threshold and the difference (VCC – VBAT) exceeds 54mV. It sinks up to 5mA and is intended to drive an LED indicating wall adapter presence - detailed in PIN FUNCTIONS and APPLICATIONS INFORMATION.
What happens if the battery voltage falls below 3.8V after a full charge cycle with the LTC1732EMS-4#PBF?
If the battery voltage falls below 3.8V after a full charge cycle, the LTC1732EMS-4#PBF automatically initiates a new charge cycle - even while continuously powered - to maintain optimal state-of-charge. This recharge threshold is fixed for the -4 variant and applies regardless of whether the drop results from load or self-discharge.
LTC1732EMS-4#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#PBF FAQ
1.How can I place an order for LTC1732EMS-4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1732EMS-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 LTC1732EMS-4#PBF reliable?
The price and inventory of LTC1732EMS-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 LTC1732EMS-4#PBF is usually 5 days.
3.What payment methods are accepted for LTC1732EMS-4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1732EMS-4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1732EMS-4#PBF?
LTC1732EMS-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1732EMS-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 LTC1732EMS-4#PBF?
For technical support, including LTC1732EMS-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1732EMS-4#PBF requirements.
6.How does Aetrix verify that LTC1732EMS-4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1732EMS-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 LTC1732EMS-4#PBF meets industry standards.
7.What is the process for return or replacement of LTC1732EMS-4#PBF?
All LTC1732EMS-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1732EMS-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 LTC1732EMS-4#PBF part is unused and in its original packaging.
Return procedure for LTC1732EMS-4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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