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Analog Devices Inc. LTC1325CSW#PBF
- Part No.:
- LTC1325CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 18-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1325CSW#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 18SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,083
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Product details
Overview
LTC1325CSW#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS battery management IC that implements microprocessor-controlled fast charging, discharge control, gas gauge, and fault monitoring for NiCd, NiMH, Li-ion, and lead-acid batteries. It integrates a 111kHz PWM current regulator with built-in PFET driver, 10-bit ADC, internal 3.072V voltage regulator, programmable battery voltage attenuator, and 3-/4-wire serial interface. It is used in portable medical devices requiring precise charge termination via ΔVBAT/Δt and temperature profiling.
For engineers reviewing the LTC1325CSW#PBF datasheet, LTC1325CSW#PBF pinout, LTC1325CSW#PBF application, or LTC1325CSW#PBF equivalent, key selection criteria include its 4.5V–16V wide VDD range, 30µA shutdown current, programmable DAC-based current regulation (16–160mV reference), integrated fault comparators (HTF/LTF/MCV/EDV), and support for up to 8-cell battery stacks with configurable divider ratios (1:1 to 1:16).
Technical Context
The LTC1325CSW#PBF operates in five distinct modes-power shutdown, idle, discharge, charge, and gas gauge-each controlled via a 22-bit serial command word. Its core charge loop uses an internal 111kHz oscillator to drive a PWM-controlled external PFET, forcing average SENSE pin voltage to one of four DAC outputs (16–160mV) to regulate current as VDAC/RSENSE.
Fault detection is implemented through dedicated analog comparators monitoring MCV (cell voltage), HTF/LTF (battery temperature), EDV (end-of-discharge), BATP/BATR (battery presence/reversal), and tOUT (programmable timeout). All fault states are latched and reported in an 8-bit status word, with fail-safe action disabling charge/discharge until FSCLR is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Supply Range | 4.5V to 16V - supports direct connection to unregulated wall adapters or multi-cell battery packs without external LDO. |
| Shutdown Current | 30µA max - enables long-term storage mode in battery-powered instruments with minimal self-discharge impact. |
| PWM Oscillator Freq | 90–130kHz (typ. 111kHz) - sets switching frequency for external buck inductor sizing and EMI filtering design. |
| DAC Reference Voltage | 16–160mV (4 programmable levels) - defines precision current setpoint for charge regulation via external RSENSE. |
| ADC Resolution | 10-bit - provides sufficient resolution for battery voltage (±10mV), temperature (±1°C), and gas gauge integration accuracy. |
| Battery Divider Ratio | 1:1 to 1:16 - allows single IC to manage 1–16 series cells by scaling VBAT measurement to per-cell level. |
| Serial Interface | 3- or 4-wire SPI-compatible - enables low-pin-count MCU interfacing with full status readback and mode configuration. |
Pinout & Package
18-lead plastic SO wide (SW) package, 0.300" body width, RoHS-compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (18) | Positive supply input | Accepts 4.5–16V; powers digital logic, internal regulator, and PFET driver; must be bypassed with ≥10µF capacitor. |
| PGATE (17) | PFET gate driver output | Swings rail-to-rail (GND to VDD); drives external high-side P-channel MOSFET in buck charger topology. |
| DIS (16) | Active-high discharge control | Drives external N-channel transistor to enable controlled battery discharge for conditioning or calibration. |
| VBAT (15) | Battery stack input | Connects to positive terminal of battery pack; feeds internal programmable voltage divider for per-cell monitoring. |
| TBAT (14) | Battery temperature sensor input | Accepts NTC thermistor network referenced to REG; used for HTF/LTF fault detection during charge/discharge. |
| TAMB (13) | Ambient temperature input | Optional second thermistor input; enables Δ(TBAT–TAMB) termination algorithms and thermal derating. |
| VIN (12) | General-purpose ADC input | Supports auxiliary measurements (e.g., input supply voltage, auxiliary sensor) with 10-bit resolution. |
| SENSE (11) | Current sense amplifier input | Connected to low-side shunt resistor; closed-loop control forces average voltage = VDAC for precise current regulation. |
| FILTER (10) | RC filter node for gas gauge | Combines with internal 1kΩ RF to form low-pass filter for averaging discharge current before ADC conversion. |
| GND (9) | Analog/digital ground reference | Single-point star ground required; separates noisy power paths from sensitive ADC and reference circuits. |
| HTF (8) | High-temp fault comparator input | Set via resistive divider from REG (3.072V); triggers FHTF when TBAT voltage falls below this threshold. |
| MCV (7) | Max cell voltage comparator input | Set via resistive divider from REG; asserts FMCV if measured cell voltage exceeds programmed limit. |
| LTF (6) | Low-temp fault comparator input | Set via resistive divider from REG; triggers FLTF when TBAT voltage rises above this threshold (NTC behavior). |
| CLK (5) | Serial interface clock input | Accepts 25–500kHz TTL clock; timing-critical for command/status transfer; requires stable edge rates. |
| CS (4) | Chip select input | Active-low; initiates 22-bit command word latch and 8-bit status word shift-out sequence. |
| DIN (3) | Serial data input | Latches command bits on rising CLK edge; supports MSB-first or LSB-first data format per MSBF bit. |
| DOUT (2) | Serial data output | Drives status word on falling CLK edge; tri-state when CS high; compatible with 3-wire bus sharing with DIN. |
| REG (1) | Internal 3.072V regulator output | Stable reference for ADC, comparators, and external bias networks; requires ≥4.7µF ceramic bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 111kHz PWM current regulator | Enables accurate constant-current charging across chemistries without external op-amps or PWM controllers. |
| Integrated 10-bit ADC with multiplexed inputs | Measures VBAT, TBAT, TAMB, VIN, and gas gauge voltage simultaneously-eliminates need for external ADC. |
| Configurable battery voltage divider (1:1–1:16) | Allows single LTC1325CSW#PBF to scale from 1-cell wearables to 8-cell portable test equipment. |
| Dedicated fault comparators with latch reporting | Provides real-time, hardware-level protection against overvoltage, overtemperature, reversal, and timeout-reducing MCU firmware burden. |
| Gas gauge function with RC-averaged sense voltage | Enables Coulomb counting using internal gain ×4 amplifier and filtered SENSE signal-no external integrator needed. |
| 30µA shutdown current with digital I/O retention | Permits battery-backed operation in standby while preserving serial interface readiness for wake-up commands. |
Applications
| Portable Medical Monitors | Industrial Handheld Testers |
|---|---|
Use Scenario: Battery-powered ECG and pulse oximeter units requiring FDA-compliant charge safety and runtime estimation. IC Role / Device Role / Timing Role: Central battery manager handling charge termination via dual ΔVBAT/Δt and ΔTBAT/Δt algorithms, plus real-time gas gauge for remaining runtime display. Use Value: Meets IEC 62366 usability requirements by eliminating software-only fault detection-hardware comparators ensure fail-safe shutdown independent of MCU execution. |
Use Scenario: Ruggedized multimeters and insulation testers operating from rechargeable NiMH packs in field service environments. IC Role / Device Role / Timing Role: Controls high-current fast charge (up to 2A) while monitoring ambient temperature drift to prevent overcharge in hot garages or cold warehouses. Use Value: Programmable 1:8 battery divider and ±1°C temperature accuracy enable single BOM to support both 4-cell and 8-cell pack variants without hardware change. |
| Emergency Lighting Systems | Backup Power Modules |
Use Scenario: UL924-compliant LED exit signs with automatic monthly self-test and 90-minute runtime validation. IC Role / Device Role / Timing Role: Manages lead-acid battery charging, performs periodic discharge verification, and logs cycle count via gas gauge integration. Use Value: Built-in discharge mode with DIS pin control eliminates need for external discharge FET drivers-reducing BOM count and PCB area. |
Use Scenario: Telecom remote radio units powered by Li-ion backup banks requiring >10-year calendar life and deep discharge recovery. IC Role / Device Role / Timing Role: Implements low-temperature charge inhibition (LTF) and end-of-discharge voltage (EDV) cutoff to prevent irreversible capacity loss during extended outages. Use Value: Hardware-enforced EDV at 900mV/cell prevents copper dissolution in Li-ion cells-extending usable cycle life beyond 500 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2010PWR | Single-cell Li-ion only; no NiCd/NiMH support; integrated FETs (no external PFET required); 12-bit ADC. | Limited to consumer electronics with fixed chemistry; lacks programmable divider for multi-cell stacks. | Select for cost-sensitive, single-chemistry designs where external FETs add complexity; not suitable for industrial multi-chemistry systems. |
| MAX1757EAP+ | Higher VDD range (4.75–28V); includes SMBus interface; no integrated regulator; requires external reference. | Better suited for 24V industrial battery systems; lacks gas gauge and discharge mode functionality. | Choose when interfacing with existing SMBus infrastructure or managing >16V battery packs; verify external bias network design for REG replacement. |
Compared with LTC1325CSW#PBF, BQ2010PWR simplifies layout but sacrifices multi-chemistry flexibility, while MAX1757EAP+ extends voltage range at the cost of losing integrated regulation and gas gauge-making LTC1325CSW#PBF optimal for programmable, multi-cell, mixed-chemistry embedded systems.
Availability
LTC1325CSW#PBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld testers, and emergency lighting systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1325CSW#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1325CSW#PBF belongs to ADI's legacy Linear Technology battery management portfolio, designed specifically for microprocessor-based, multi-chemistry battery systems requiring hardware-enforced safety, flexible configuration, and minimal external components.
FAQ
What battery chemistries does the LTC1325CSW#PBF support?
The LTC1325CSW#PBF supports nickel-cadmium (NiCd), nickel-metal-hydride (NiMH), lithium-ion (Li-ion), and lead-acid batteries. Its programmable DAC reference (16–160mV), configurable voltage divider (1:1 to 1:16), and dedicated fault comparators (MCV, EDV, HTF, LTF) allow safe, chemistry-specific charge profiles under µP control. The LTC1325CSW#PBF does not auto-detect chemistry-it relies on host firmware to configure appropriate thresholds and termination algorithms.
How does the LTC1325CSW#PBF implement gas gauge functionality?
The LTC1325CSW#PBF implements gas gauge by measuring average discharge current through an external sense resistor. The SENSE pin voltage is filtered by an internal 1kΩ resistor and external capacitor (FILTER pin), amplified with ×4 inverting gain, then digitized by the 10-bit ADC. Host firmware accumulates these readings over time to compute total charge removed. The LTC1325CSW#PBF itself does not store or integrate-integration is performed externally by the µP.
Can the LTC1325CSW#PBF charge batteries with voltages higher than its VDD supply?
Yes, the LTC1325CSW#PBF can charge batteries with voltages greater than VDD. Its VBAT pin accepts up to 16V, and the internal programmable voltage divider isolates measurement circuitry from high-voltage battery stacks. The PGATE driver swings rail-to-rail (GND to VDD), so external high-side PFETs (e.g., IRF9Z30) must be used to handle battery voltage-enabling buck topologies where battery voltage exceeds VDD. This capability is explicitly confirmed in the datasheet's "FEATURES" list.
What is the purpose of the FILTER pin on the LTC1325CSW#PBF?
The FILTER pin on the LTC1325CSW#PBF connects to an external capacitor that forms a low-pass RC filter with an internal 1kΩ resistor (RF). During gas gauge operation, this filter averages the voltage across the sense resistor to reject PWM switching noise before amplification and ADC conversion. In charge mode, it reduces noise coupling into the battery voltage divider output. The LTC1325CSW#PBF requires this external capacitor (typically 1µF) to maintain ADC accuracy in noisy switching environments.
Does the LTC1325CSW#PBF require external components for basic operation?
Yes, the LTC1325CSW#PBF requires several external components for full functionality: a ≥4.7µF capacitor on REG (Pin 1), ≥10µF on VDD (Pin 18), external PFET (e.g., IRF9Z30) driven by PGATE (Pin 17), discharge transistor controlled by DIS (Pin 16), sense resistor (RSENSE) on SENSE (Pin 11), thermistors on TBAT/TAMB (Pins 14/13), and resistive dividers for MCV/LTF/HTF (Pins 7/6/8). Minimal operation (e.g., ADC reads only) may omit some, but charging requires all key elements.
LTC1325CSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 18-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 3.072V
- Voltage - Supply (Max):
- 16V
- Interface:
- Serial
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-SO
LTC1325CSW#PBF FAQ
1.How can I place an order for LTC1325CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1325CSW#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 LTC1325CSW#PBF reliable?
The price and inventory of LTC1325CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1325CSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1325CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1325CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1325CSW#PBF?
LTC1325CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1325CSW#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 LTC1325CSW#PBF?
For technical support, including LTC1325CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1325CSW#PBF requirements.
6.How does Aetrix verify that LTC1325CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1325CSW#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 LTC1325CSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1325CSW#PBF?
All LTC1325CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1325CSW#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 LTC1325CSW#PBF part is unused and in its original packaging.
Return procedure for LTC1325CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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