My Inquiry
My Account
Analog Devices Inc. LTC1732EMS-8.4#PBF
- Part No.:
- LTC1732EMS-8.4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC1732EMS-8.4#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 2CEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:489
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 lithium-ion (8.4V nominal) batteries. It delivers ±1% float voltage accuracy, ±7% programmable charge current (up to 500mA), and automatic trickle charging below 4.9V - used in handheld computing and digital camera charging docks.
For engineers reviewing the LTC1732EMS-8.4 datasheet, LTC1732EMS-8.4 pinout, LTC1732EMS-8.4 application, or LTC1732EMS-8.4 equivalent, key selection factors include its 10-pin MSOP package, C/10 end-of-charge detection, programmable timer via external capacitor, 8.8–12V input range, and automatic recharge trigger at 8.05V battery voltage.
Technical Context
The LTC1732EMS-8.4 implements a linear control architecture using an internal 2.457V precision reference, voltage amplifier, and current amplifier to regulate both float voltage and charge current. Its gate drive (DRV) output controls an external P-channel MOSFET or high-gain PNP transistor, with feedback sourced from BAT (voltage sense) and SENSE (current sense) pins.
Charge sequencing is governed by multiple comparators: VTRIKL (4.7–5.1V) initiates trickle mode; VRECHRG (7.85–8.05V) triggers automatic recharge; and VUV (8.2–8.7V) enables undervoltage lockout with 400mV hysteresis. The TIMER pin accepts an external capacitor to set total charge time with ±10% accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Voltage | 8.4V ±1% float voltage - ensures safe, precise termination for 2-cell Li-Ion without overvoltage risk |
| Max Charge Current | 500mA typical (RPROG=19.6kΩ, RSENSE=0.2Ω) - supports fast charging of compact portable devices |
| Input Voltage Range | 8.8V to 12V - compatible with standard wall adapters and avoids dropout during line transients |
| Trickle Threshold | 4.9V ±0.2V - enables safe pre-conditioning of deeply discharged cells before full-rate charging |
| Recharge Threshold | 8.05V ±0.2V - initiates new charge cycle upon battery self-discharge, extending usable runtime |
| Sleep Mode Drain | 10µA max - minimizes battery leakage when input supply is removed, critical for long standby |
| Timer Accuracy | ±10% (CTIMER = 0.1µF) - provides predictable charge duration for safety-critical applications |
Pinout & Package
Package: 10-pin MSOP (3.0mm × 3.0mm × 1.1mm height), surface-mount, exposed pad not included per drawing 05-08-1661.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (1) | Battery voltage sense input | Connects to battery positive; internal 720Ω/35µA divider sets 8.4V regulation point; disconnected in sleep mode to reduce drain |
| SEL (2) | Function select | Must be tied to VCC to configure for 2-cell (8.4V) operation; not floating or grounded |
| CHRG (3) | Open-drain charge status output | Pulled low during charge; switches to 35µA sink at C/10; high-impedance after timer expiry - supports 3-state microcontroller interface |
| TIMER (4) | Timer capacitor & CV disable input | Capacitor to GND sets 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 circuits and external resistors; must be low-impedance connection |
| PROG (6) | Charge current programming & shutdown input | RPROG to GND sets IBAT = (2.457V × 800Ω)/(RPROG × RSENSE); floating triggers shutdown (ICC ≈ 1mA) |
| DRV (7) | External pass device gate/base driver | Drives P-MOSFET gate or PNP base; no compensation needed with MOSFET; requires 1000pF DRV-to-VCC cap with PNP |
| VCC (8) | Main input supply | Accepts 8.8–12V; bypass with 1µF X5R/X7R ceramic; UVLO activates below 8.2V with 400mV hysteresis |
| SENSE (9) | Current sense input | Connected to RSENSE between VCC and SENSE; senses voltage drop to servo charge current |
| ACPR (10) | Wall adapter present indicator | Open-drain output pulled low when VCC > VBAT + 54mV and VCC > 8.2V - drives LED without external transistor |
Key Features
| Feature | Design Value |
|---|---|
| ±1% float voltage regulation | Ensures cell-level voltage compliance for 2-cell Li-Ion stacks, preventing degradation or thermal runaway |
| Programmable C/10 end-of-charge detection | Provides reliable, comparator-based termination signal independent of timer - enables dual-termination safety |
| Automatic trickle-to-fast transition at 4.9V | Protects damaged or deeply depleted cells by limiting initial current to 10% of programmed value |
| 8.05V automatic recharge threshold | Maintains battery readiness without manual intervention, supporting always-on portable instrumentation |
| 10µA sleep-mode battery drain | Extends shelf life and standby time in battery-backed systems where input power is intermittent |
Applications
| Cellular Phones | Handheld Computers |
|---|---|
Use Scenario: Integrated charging circuit in slim smartphone designs with single-wall-adapter support. IC Role / Device Role / Timing Role: Linear charger controller managing CC/CV profile, C/10 detection, and AC presence signaling. Use Value: Eliminates need for firmware-controlled charging ICs; ±1% voltage accuracy prevents overcharging of sensitive 2-cell packs. | Use Scenario: Docking station for ruggedized PDAs requiring automatic battery top-up on insertion. IC Role / Device Role / Timing Role: Battery management unit providing trickle start, timed full charge, and auto-recharge on voltage sag. Use Value: Enables maintenance-free operation: detects new battery insertion (<8.05V) and restarts full charge cycle without host MCU involvement. |
| Charging Docks and Cradles | Digital Cameras and Camcorders |
Use Scenario: Multi-device cradle powering two Li-Ion batteries simultaneously via shared adapter. IC Role / Device Role / Timing Role: Dual-channel-capable controller (per IC) regulating voltage/current while indicating AC presence (ACPR) and charge status (CHRG). Use Value: ACPR pin directly drives status LED; CHRG's 3-state output allows microcontroller to distinguish charging, C/10, and completion - reducing BOM count. | Use Scenario: Compact camcorder with removable 2-cell Li-Ion pack and USB/wall-adapter dual-input charging. IC Role / Device Role / Timing Role: Standalone linear charger handling preconditioning, constant-current ramp, and CV taper with timer backup. Use Value: ±10% timer accuracy and ±1% voltage regulation meet IEC 62133 safety requirements for consumer imaging equipment without software overhead. |
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-8.4#PBF | Same 10-pin MSOP package; identical 8.4V float voltage; lacks ACPR pin and SEL pin - fixed 2-cell config only | No wall-adapter detection; simpler layout but requires external AC detect circuit if status LED needed | Choose when ACPR functionality is unnecessary and board space is constrained |
| LTC4053EDD-4.2#PBF | USB/wall-compatible; integrates 500mA switch; 4.2V output - designed for single-cell, not 2-cell 8.4V | Supports dual-input (5V USB + adapter); includes thermal regulation; incompatible voltage range for 2-cell Li-Ion | Choose only for single-cell applications; not a functional substitute for LTC1732EMS-8.4's 2-cell control |
Compared with LTC1731CMS-8.4#PBF, the LTC1732EMS-8.4 adds ACPR and explicit SEL configuration for robust adapter detection and flexible 2-cell setup; versus LTC4053EDD-4.2#PBF, it provides correct 8.4V regulation and linear topology suited for higher-input-voltage wall adapters - neither alternative matches its exact 2-cell linear control scope.
Availability
LTC1732EMS-8.4 is available at Aetrix Electronics and suitable for handheld computers, digital cameras, and charging docks requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to 85°C.
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 full technical and supply chain continuity for legacy Linear products including the LTC1732 series.
The LTC1732EMS-8.4 belongs to Linear's precision analog battery management portfolio, engineered specifically for cost-sensitive, firmware-free linear charging of multi-cell Li-Ion packs in portable consumer electronics.
FAQ
What is the exact float voltage setpoint of the LTC1732EMS-8.4 and how is it trimmed?
The LTC1732EMS-8.4 has a nominal float voltage of 8.4V, trimmed to ±1% accuracy (8.316V to 8.484V) using an internal precision resistor divider and 2.457V bandgap reference. This tolerance is guaranteed over the full –40°C to 85°C operating temperature range and does not require external calibration. The LTC1732EMS-8.4 achieves this stability through laser-trimmed on-chip resistors and process-matched amplifiers.
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/NiCd batteries by connecting the TIMER pin to VCC, which disables the voltage amplifier and timer to force constant-current-only operation. Since these chemistries require ΔV/ΔT or temperature-based termination, the LTC1732EMS-8.4 provides only current regulation - external circuitry or host MCU supervision must implement final termination. The LTC1732EMS-8.4 does not include built-in NiMH/NiCd termination logic.
What happens to the LTC1732EMS-8.4 when the input supply is disconnected during charging?
When the input supply is removed, the LTC1732EMS-8.4 automatically enters sleep mode: the internal resistor divider disconnects from BAT to reduce battery drain to ≤30µA (typical 10µA), the DRV pin pulls up to VCC to turn off the external pass device, and the CHRG pin goes high-impedance. This preserves battery capacity during adapter disconnection and enables seamless resumption when power returns - a core behavior of the LTC1732EMS-8.4.
How is charge current programmed on the LTC1732EMS-8.4, and what resistor tolerances are recommended?
Charge current on the LTC1732EMS-8.4 is set by two external resistors: RPROG from PROG to GND and RSENSE between VCC and SENSE. The formula is IBAT = (2.457V × 800Ω) / (RPROG × RSENSE). For example, 500mA requires RSENSE = 0.2Ω and RPROG = 19.6kΩ. Linear recommends 1% metal-film or thin-film resistors for both to maintain the specified ±7% current accuracy across temperature and lifetime - the LTC1732EMS-8.4's design assumes this tolerance.
Does the LTC1732EMS-8.4 support automatic recharge, and what is the precise voltage threshold?
Yes, the LTC1732EMS-8.4 supports automatic recharge: when the battery voltage drops below 8.05V (with ±0.2V tolerance over temperature), it initiates a new full charge cycle - even while continuously connected to the charger. This threshold is internally generated and factory-trimmed; no external components are required. The LTC1732EMS-8.4 uses this feature to maintain battery readiness in always-connected applications like docking stations.
LTC1732EMS-8.4#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:
- 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#PBF FAQ
1.How can I place an order for LTC1732EMS-8.4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1732EMS-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 LTC1732EMS-8.4#PBF reliable?
The price and inventory of LTC1732EMS-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 LTC1732EMS-8.4#PBF is usually 5 days.
3.What payment methods are accepted for LTC1732EMS-8.4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1732EMS-8.4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1732EMS-8.4#PBF?
LTC1732EMS-8.4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1732EMS-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 LTC1732EMS-8.4#PBF?
For technical support, including LTC1732EMS-8.4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1732EMS-8.4#PBF requirements.
6.How does Aetrix verify that LTC1732EMS-8.4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1732EMS-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 LTC1732EMS-8.4#PBF meets industry standards.
7.What is the process for return or replacement of LTC1732EMS-8.4#PBF?
All LTC1732EMS-8.4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1732EMS-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 LTC1732EMS-8.4#PBF part is unused and in its original packaging.
Return procedure for LTC1732EMS-8.4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1732EMS-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…
