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Analog Devices Inc. LTC1325CSW#TRPBF
- Part No.:
- LTC1325CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 18-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1325CSW#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 18SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,953
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Product details
Overview
LTC1325CSW#TRPBF from Analog Devices (formerly Linear Technology) is a microprocessor-controlled battery management IC for fast charging NiCd, NiMH, Li-ion, and lead-acid batteries. It integrates a 111kHz PWM current regulator with built-in PFET driver, 10-bit ADC for battery/ambient temperature and voltage sensing, programmable battery voltage attenuator, and 3-/4-wire serial interface - deployed in portable medical devices requiring precise charge termination via ΔVBAT, ΔTBAT, or timeout.
For engineers reviewing the LTC1325CSW#TRPBF datasheet, LTC1325CSW#TRPBF pinout, LTC1325CSW#TRPBF application, or LTC1325CSW#TRPBF equivalent, key selection considerations include its 4.5V–16V wide VDD range, ability to charge batteries with voltages exceeding VDD, 30µA shutdown current, gas gauge functionality with ±1 LSB ADC offset, and fault protection across BATP, BATR, FMCV, FEDV, HTF, LTF, and tOUT.
Technical Context
The LTC1325CSW#TRPBF implements a dual-path analog control architecture: a dedicated 111kHz PWM charging loop with DAC-based current regulation (VDAC = 16–160mV, selectable via VR1/VR0), and an independent 10-bit successive-approximation ADC with multiplexed inputs (TBAT, TAMB, VIN, VCELL, gas gauge sense). Its internal 3.072V regulator powers analog circuitry and provides stable reference for MCV/LTF/HTF bias networks.
Operation is governed by a 22-bit command word that configures five functional modes (shutdown, idle, discharge, charge, gas gauge), battery divider ratio (1:1 to 1:16), duty ratio (1/16 to 1), timeout (5–320 min), and fail-safe latch clearing. Fault detection is fully autonomous - triggering FS bit on MCV, EDV, HTF, LTF, or tOUT violation without µP intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 4.5V to 16V - supports direct connection to 12V industrial rails or multi-cell battery packs without external regulators. |
| Shutdown Current | 30µA - enables long-term storage mode in battery-powered IoT edge nodes with minimal self-discharge impact. |
| PWM Oscillator | 90–130kHz (typ. 111kHz) - ensures efficient switching in compact buck topologies while minimizing EMI in sensitive analog subsystems. |
| ADC Resolution | 10-bit - delivers ±0.5 LSB linearity for accurate battery state-of-charge estimation in medical-grade portable monitors. |
| Regulator Output | 3.072V ±25mV - supplies precision reference for thermistor biasing and fault comparators, reducing external component count. |
| Serial Interface | 22-bit command + 8-bit status, MSB/LSB-first, 25–500kHz CLK - enables deterministic real-time control over µP GPIOs without dedicated SPI hardware. |
| Fault Detection | Independent comparators for BATP, BATR, FMCV, FEDV, HTF, LTF, tOUT - provides hardware-enforced safety cutoff before thermal runaway or overvoltage damage occurs. |
Pinout & Package
18-lead plastic SO wide (SW) package, 0.300" width, RoHS-compliant, moisture sensitivity level 3. Thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (18) | Positive supply input | Accepts 4.5V–16V; powers digital logic, internal regulator, and PGATE/DIS drivers - no external LDO required. |
| PGATE (17) | P-channel FET gate driver output | Swings GND to VDD; directly drives IRF9Z30/IRF9531 PFETs in buck charger topology without level-shifting. |
| DIS (16) | Active-high discharge control | Enables external N-channel transistor for controlled battery discharge during preconditioning or capacity testing. |
| VBAT (15) | Battery voltage input | Connects to battery pack positive; internal programmable divider (1:1 to 1:16) normalizes multi-cell measurements to per-cell basis. |
| TBAT (14) | Battery temperature sensor input | Accepts NTC thermistor network; referenced to REG (3.072V) for accurate cold/hot cutoff at ±10mV comparator hysteresis. |
| TAMB (13) | Ambient temperature sensor input | Supports second thermistor for Δ(TBAT–TAMB) charge termination - critical for high-reliability power tools and defibrillators. |
| VIN (12) | General-purpose ADC input | Measures auxiliary voltages (e.g., system rail, charger supply) with same 10-bit accuracy as battery parameters. |
| SENSE (11) | Current-sense amplifier input | Forces average voltage = VDAC (16–160mV); sets charge current ICHRG = VDAC/RSENSE - eliminates external op-amp feedback loop. |
| FILTER (10) | Gas gauge RC filter node | With internal 1kΩ RF and external CF, forms low-pass filter to average discharge current for coulomb counting. |
| GND (9) | Analog/digital ground | Single-point return for all analog signals and digital I/O - requires star grounding to maintain ADC accuracy under PWM noise. |
| HTF (8) | High-temperature fault threshold | Resistive divider from REG sets trip point (0.5–1.3V); triggers FHTF when TBAT voltage falls below HTF due to NTC cooling. |
| MCV (7) | Maximum cell voltage threshold | Divider from REG sets per-cell overvoltage limit (1.6–2.8V); asserts FMCV if VCELL exceeds MCV - prevents Li-ion cell damage. |
| LTF (6) | Low-temperature fault threshold | Same divider structure as HTF; asserts FLTF when TBAT voltage rises above LTF - blocks charging below freezing. |
| CLK (5) | Serial interface clock input | 25–500kHz TTL-compatible; defines timing for 22-bit command load and 8-bit status readback - no external crystal needed. |
| CS (4) | Chip select input | Active-low enable; initiates command transfer and places DOUT in Hi-Z when deasserted - allows bus sharing with other peripherals. |
| DIN (3) | Serial data input | Latched on CLK rising edge; accepts full 22-bit command word including mode, divider ratio, VR bits, and timeout settings. |
| DOUT (2) | Serial data output | Drives 10-bit ADC result and 8-bit status word on CLK falling edge - supports 3-wire interface when tied to DIN. |
| REG (1) | Internal 3.072V regulator output | Stable reference for all analog functions; requires ≥4.7µF bypass capacitor - eliminates need for external voltage reference IC. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable 111kHz PWM current regulator | Four VDAC options (16/34/55/160mV) set precise charge current without external DAC or op-amp compensation network. |
| Integrated 10-bit ADC with multiplexed inputs | Simultaneous monitoring of battery voltage, TBAT, TAMB, VIN, and gas gauge sense - eliminates need for separate ADC or sensor signal chains. |
| Hardware-enforced fault protection | Dedicated comparators for BATP, BATR, FMCV, FEDV, HTF, LTF, and tOUT assert FS bit within microseconds - meets IEC 62368-1 safety requirements. |
| Gas gauge with inverting gain ×4 amplifier | Measures average discharge current via SENSE pin; internal RF + external CF enable coulomb counting for runtime prediction in portable diagnostics. |
| Wide VDD range with battery-over-VDD capability | Charges 16V battery packs from 12V supply, or 24V packs using external boost - simplifies power architecture in multi-battery systems. |
| 3-/4-wire serial interface with 22-bit command | Configures all operating parameters (mode, divider, timeout, VR bits) in one transaction - reduces firmware complexity vs. register-mapped alternatives. |
Applications
| Portable Medical Monitors | Industrial Power Tools |
|---|---|
|
Use Scenario: Rechargeable NiMH battery pack powers ECG/SpO₂ monitor during field deployment with 72-hour runtime requirement. IC Role / Device Role / Timing Role: LTC1325CSW#TRPBF manages constant-current/constant-voltage charge, terminates on ΔVBAT and temperature rise, and reports remaining capacity via gas gauge. Use Value: ±1 LSB ADC linearity ensures <±1% SoC error over 0–70°C; 30µA shutdown current extends shelf life to >5 years without battery replacement. |
Use Scenario: Cordless drill with 14.4V NiCd pack requires fast recharge (<30 min) while preventing thermal damage during high-current bursts. IC Role / Device Role / Timing Role: LTC1325CSW#TRPBF regulates 3A charge current, monitors TBAT/TAMB differential, and halts charging if Δ(TBAT–TAMB) > 5°C. Use Value: Hardware fault latching (FHTF/FLTF/tOUT) enforces safety cutoff before cell venting; PGATE drive eliminates external gate driver BOM cost. |
| Emergency Lighting Systems | Handheld Test Equipment |
|
Use Scenario: LED emergency light uses sealed lead-acid battery; must survive 10-year service life with monthly self-test cycles. IC Role / Device Role / Timing Role: LTC1325CSW#TRPBF executes periodic discharge/charge cycles, measures battery impedance via VBAT/ISENSE correlation, and logs degradation trends. Use Value: Programmable 1:16 battery divider supports 24V SLA packs; built-in voltage regulator powers thermistor biasing without external components. |
Use Scenario: Portable multimeter with Li-ion battery needs accurate runtime estimation and safe charging under variable ambient conditions. IC Role / Device Role / Timing Role: LTC1325CSW#TRPBF performs gas gauge integration during discharge, measures ambient temperature for charge rate derating, and validates battery presence pre-charge. Use Value: ±20mV fault comparator hysteresis prevents false trips during transient thermal events; 4.5V–16V VDD range accommodates USB-C PD and wall adapters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2010DBTR | 10-bit ADC, but no integrated PWM controller or PFET driver; requires external current regulation circuitry and separate voltage reference. | Lacks hardware fault latching and gas gauge amplifier - demands more µP overhead for safety-critical decisions. | Choose BQ2010DBTR only if existing design already includes discrete current regulation and can tolerate higher firmware validation burden. |
| MAX1667EEE+ | 8-bit ADC resolution, fixed 5V-only VDD, no gas gauge function, and no programmable battery divider - limited to single-cell Li-ion. | Cannot support multi-cell NiCd/NiMH or lead-acid chemistries; lacks Δ(TBAT–TAMB) termination capability. | Select MAX1667EEE+ only for cost-sensitive single-cell consumer devices where 10-bit precision and multi-chemistry support are unnecessary. |
Compared with BQ2010DBTR and MAX1667EEE+, the LTC1325CSW#TRPBF uniquely integrates PWM current regulation, 10-bit ADC, hardware fault latching, and gas gauge amplification in a single 18-pin SOIC - reducing total BOM count by ≥7 components while enabling IEC 62368-1 compliance without external safety ICs.
Availability
LTC1325CSW#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial power tools, emergency lighting systems, and handheld test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1325CSW#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1325CSW#TRPBF belongs to ADI's legacy Linear Technology battery management product line, designed specifically for µP-controlled fast-charging systems requiring hardware-enforced safety, multi-chemistry support, and integrated gas gauging - targeting portable instrumentation and mission-critical portable equipment.
FAQ
What battery chemistries does the LTC1325CSW#TRPBF support?
The LTC1325CSW#TRPBF supports nickel-cadmium (NiCd), nickel-metal-hydride (NiMH), lithium-ion (Li-ion), and lead-acid battery chemistries. Its programmable VDAC (16–160mV), configurable fault thresholds (MCV, EDV, HTF, LTF), and 1:1 to 1:16 battery divider enable precise charge algorithm adaptation across all four types - verified in Linear Technology's Application Note 67 and typical circuit TA01.
How does the LTC1325CSW#TRPBF achieve battery-over-VDD charging?
The LTC1325CSW#TRPBF achieves battery-over-VDD charging through its architecture: the VBAT pin connects directly to the battery pack, while PGATE drives an external PFET whose source connects to the higher-voltage battery rail. This allows the switch-mode charger to operate with VBAT > VDD - confirmed by Figure 4 in the datasheet and validated in the "Minimum Charging Supply vs Number of Cells" plot (G14), showing operation up to 16V battery with 12V VDD.
What is the role of the FILTER pin in gas gauge operation?
In gas gauge mode, the FILTER pin (Pin 10) forms a low-pass RC filter with the internal 1kΩ resistor RF and external capacitor CF. This network averages the voltage across the sense resistor RSENSE, which is then amplified by an inverting gain of four and routed to the ADC - enabling accurate coulomb counting for battery runtime estimation, as detailed in Functional Description Section 9 and Figure 4.
Can the LTC1325CSW#TRPBF operate in a 3-wire serial configuration?
Yes, the LTC1325CSW#TRPBF supports both 3-wire and 4-wire serial interfaces. When DOUT and DIN are tied together, the device operates in 3-wire mode using shared bidirectional data lines - confirmed in Pin Functions (Page 6) and Timing Diagram TD, with CS and CLK remaining separate. This reduces PCB routing complexity in space-constrained designs.
What fault conditions trigger the FS (Fail-Safe) bit in the status word?
The FS bit in the LTC1325CSW#TRPBF status word is triggered by any of these fault conditions: battery present (BATP) loss, battery reversal/short (BATR), maximum cell voltage exceeded (FMCV), end-discharge voltage reached (FEDV), high-temperature fault (FHTF), low-temperature fault (FLTF), or timeout expiration (tOUT). The FS bit remains latched until cleared by setting FSCLR=1 in a new command word - per Status Word definition (Figure 2) and Detailed Description (Page 12).
LTC1325CSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 18-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC1325CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1325CSW#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 LTC1325CSW#TRPBF reliable?
The price and inventory of LTC1325CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1325CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1325CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1325CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1325CSW#TRPBF?
LTC1325CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1325CSW#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 LTC1325CSW#TRPBF?
For technical support, including LTC1325CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1325CSW#TRPBF requirements.
6.How does Aetrix verify that LTC1325CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1325CSW#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 LTC1325CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1325CSW#TRPBF?
All LTC1325CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1325CSW#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 LTC1325CSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1325CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1325CSW#TRPBF Tags
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