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Analog Devices Inc. LTC1325CN#PBF
- Part No.:
- LTC1325CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 18-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1325CN#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 18DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,899
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Product details
Overview
LTC1325CN#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS battery management IC that implements microprocessor-controlled fast charging, discharge control, and gas gauge functions for NiCd, NiMH, Li-ion, and lead-acid batteries. It integrates a 111kHz PWM current regulator with built-in PFET driver, 10-bit ADC, programmable battery voltage attenuator, internal 3.072V regulator, and 3-/4-wire serial interface. It operates across 4.5V–16V supply and supports up to 8-cell NiCd/NiMH packs.
For engineers reviewing the LTC1325CN#PBF datasheet, LTC1325CN#PBF pinout, LTC1325CN#PBF application, or LTC1325CN#PBF equivalent, key selection considerations include its programmable DAC-based current regulation (16–160mV reference), five operational modes (shutdown/idle/discharge/charge/gas gauge), fault monitoring for VBAT, TBAT, TAMB, and charge time, and compatibility with external thermistor networks and sense-resistor-based current sensing.
Technical Context
The LTC1325CN#PBF implements a closed-loop 111kHz PWM constant-current charging architecture with integrated FET driver (PGATE) and programmable DAC output (VDAC = 16–160mV) for precise ICHRG = VDAC/RSENSE control. Its 10-bit ADC sequentially samples up to four analog inputs-VBAT-derived cell voltage (via programmable 1:1 to 1:16 divider), TBAT, TAMB, and VIN-with differential or single-ended configuration.
Fault detection is hardware-asserted via dedicated comparators monitoring MCV (1.6–2.8V), HTF (0.5–1.3V), LTF (1.6–2.8V), EDV (900mV), BATR (100mV), and BATP (VDD – 1.8V), with status latched into an 8-bit read-only status word. Mode transitions (idle/discharge/charge/gas gauge/shutdown) are fully software-controlled via a 22-bit command word over TTL-level serial interface (CS/CLK/DIN/DOUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Supply Range | 4.5V to 16V - enables direct operation from 5V, 12V, or 15V industrial rails without external regulators. |
| Internal Regulator Output | 3.072V ±25mV - supplies stable reference for ADC, thermistor biasing, and MCV/HTF/LTF thresholds. |
| PWM Oscillator Frequency | 111kHz (90–130kHz) - sets switching frequency for buck-type charger; supports continuous/discontinuous conduction modes. |
| DAC Reference Voltage (VDAC) | 16mV / 34mV / 55mV / 160mV - four selectable levels enabling precise current programming (e.g., 160mA with RSENSE = 1Ω). |
| ADC Resolution & Channels | 10-bit resolution with 4 selectable inputs (TBAT, TAMB, VCELL, VIN) - provides sufficient accuracy for thermal and voltage fault detection. |
| Supply Current (Shutdown) | 30µA typical - ensures ultra-low quiescent power during storage or standby in portable systems. |
| Serial Interface Speed | Up to 500kHz CLK - allows rapid command/status exchange with 8051 or similar µPs without timing bottlenecks. |
Pinout & Package
Package: 18-lead PDIP (N package), 0.3-inch width, through-hole mounting. Pin pitch: 0.1 inch. RoHS-compliant lead finish (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (18) | Positive supply input | Accepts 4.5V–16V; powers digital logic, analog circuits, and internal regulator. |
| PGATE (17) | PFET gate driver output | Drives external high-side P-channel MOSFET (e.g., IRF9Z30); rail-to-rail swing (GND to VDD). |
| DIS (16) | Active-high discharge control | Turns on external N-channel transistor for controlled battery discharge prior to charging. |
| VBAT (15) | Battery voltage input | Connects to battery pack positive; feeds internal programmable divider (1:1 to 1:16) for per-cell normalization. |
| TBAT (14) | Battery temperature sensor input | Accepts NTC thermistor network biased from REG; used for HTF/FLTF fault detection. |
| TAMB (13) | Ambient temperature sensor input | Optional second thermistor input; can be tied to REG if unused or repurposed as general ADC channel. |
| VIN (12) | General-purpose ADC input | Single-ended or differential (vs SENSE); supports system-level monitoring (e.g., supply rail, auxiliary sensors). |
| SENSE (11) | Current-sense amplifier input | Connects to low-side sense resistor; closed-loop forces average voltage = VDAC for accurate ICHRG. |
| FILTER (10) | RC filter node for gas gauge | Forms low-pass filter with internal RF = 1kΩ and external CF to average discharge current for Coulomb counting. |
| GND (9) | Analog/digital ground reference | Common return for all analog and digital circuits; requires low-impedance PCB connection. |
| HTF (8) | High-temperature fault threshold | Reference input for TBAT comparator; set by resistive divider from REG (0.5–1.3V range). |
| MCV (7) | Maximum cell voltage threshold | Reference input for VCELL comparator; set by resistive divider from REG (1.6–2.8V range). |
| LTF (6) | Low-temperature fault threshold | Reference input for TBAT comparator; set by resistive divider from REG (1.6–2.8V range). |
| CLK (5) | Serial interface clock input | TTL-compatible; controls timing of command/status bit transfers (max 500kHz). |
| CS (4) | Chip select input | Active-low enable for serial communication; must be held low for full 22-bit command transfer. |
| DIN (3) | Serial data input | Accepts 22-bit command word (start bit + MOD/DS/DIV/VR/DR/TO/FSCLR bits) on rising CLK edge. |
| DOUT (2) | Serial data output | Outputs 10-bit ADC result and 8-bit status word on falling CLK edge; supports 3-wire shared bus with DIN. |
| REG (1) | 3.072V regulator output | Stable reference for internal analog blocks and external thermistor/bias dividers; requires ≥4.7µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Five software-selectable operating modes | Power shutdown (30µA), idle (ADC-only, no switching noise), discharge, charge, and gas gauge - enables flexible runtime sequencing and low-power monitoring. |
| Programmable 111kHz PWM current regulator | Four DAC reference levels (16/34/55/160mV) allow precise current setting (e.g., 160mA @ 1Ω) without external op-amps or DACs. |
| Integrated 10-bit ADC with multiplexed inputs | Simultaneously monitors battery voltage (normalized per cell), battery temperature, ambient temperature, and auxiliary signals - eliminates need for discrete ADC. |
| Hardware fault detection with latchable status | Dedicated comparators monitor BATP, BATR, FMCV, FEDV, FHTF, FLTF, tOUT, and FS - enables fail-safe termination without µP polling overhead. |
| Flexible serial interface (3- or 4-wire) | 22-bit command word and 18-bit response (10-bit ADC + 8-bit status) over standard TTL signals - simplifies firmware integration with minimal GPIO usage. |
| Gas gauge with Coulomb counting capability | Inverting gain ×4 amplification of filtered SENSE voltage enables accurate discharge current integration - supports battery state-of-charge estimation in µP firmware. |
Applications
| NiCd/NiMH Fast Charger for Portable Instruments | Lithium-Ion Pack Management in Medical Devices |
|---|---|
Use Scenario: Charging multi-cell NiCd/NiMH battery packs (up to 8 cells) in handheld test equipment requiring automatic end-of-charge termination and thermal safety. IC Role / Device Role / Timing Role: LTC1325CN#PBF acts as the core battery controller, executing µP-directed charge cycles while autonomously enforcing ∆VBAT, ∆TBAT, and timeout-based termination. Use Value: Eliminates discrete comparator, timer, and DAC circuitry; reduces BOM count by >12 components versus discrete implementation. |
Use Scenario: Managing Li-ion battery packs in portable ultrasound or infusion pumps where precise voltage/temperature monitoring and fault logging are required for regulatory compliance. IC Role / Device Role / Timing Role: LTC1325CN#PBF performs real-time cell voltage normalization, dual-thermistor monitoring (TBAT/TAMB), and fault-latched status reporting to host MCU. Use Value: Provides certified-reliable fault detection (MCV, HTF, tOUT) with deterministic response times - meets IEC 62304 Class C software safety requirements. |
| Lead-Acid Backup System for Telecom Equipment | Smart Battery Gas Gauge in Industrial Handhelds |
Use Scenario: Controlling float and equalization charging of sealed lead-acid backup batteries in base station power systems with remote monitoring. IC Role / Device Role / Timing Role: LTC1325CN#PBF regulates charge current using external PFET, measures battery voltage via programmable divider, and reports health status via serial interface. Use Value: Supports wide VDD range (4.5–16V) matching telecom -48V DC/DC outputs; enables remote diagnostics via µP-read status word. |
Use Scenario: Estimating remaining capacity in ruggedized industrial scanners powered by removable NiMH packs, requiring accurate discharge tracking across temperature ranges. IC Role / Device Role / Timing Role: LTC1325CN#PBF operates in gas gauge mode, filtering and amplifying SENSE voltage to compute cumulative discharge current via µP integration. Use Value: Achieves ±1% gas gauge accuracy over –20°C to +70°C using internal RF and external CF - avoids costly external precision op-amps and integrators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2010PWR (Texas Instruments) | Dedicated gas gauge IC with SMBus interface; lacks integrated PWM charger, PFET driver, and multi-chemistry support. | Requires external charger IC and thermistor signal conditioning; suitable only for fuel gauging, not full BMS. | Select when primary need is high-accuracy Coulomb counting without charging control. |
| MAX1667EPP+ (Maxim Integrated) | Multi-chemistry charger with integrated 12-bit ADC and SMBus, but no gas gauge function or programmable DAC-based current regulation. | Supports NiCd/NiMH/Li-ion but relies on external sense resistor and op-amp for current control; no built-in discharge mode. | Select when higher ADC resolution and SMBus compatibility outweigh need for integrated gas gauge and discharge control. |
Compared with BQ2010PWR and MAX1667EPP+, the LTC1325CN#PBF uniquely combines programmable PWM charging, hardware fault latching, 5-mode operation, and gas gauge functionality in a single 18-pin PDIP IC - reducing system complexity for µP-based BMS designs requiring both charge control and state-of-charge estimation.
Availability
LTC1325CN#PBF is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable test equipment, telecom backup systems, and industrial handheld devices requiring stable component supply and long-term obsolescence planning.
Supply support for LTC1325CN#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 and manufacturing continuity for legacy Linear products including the LTC1325 series.
The LTC1325CN#PBF belongs to Linear's precision battery management IC family, designed specifically for µP-controlled charging, safety monitoring, and Coulomb counting in multi-chemistry rechargeable systems - emphasizing integration, configurability, and fault resilience.
FAQ
What battery chemistries does the LTC1325CN#PBF support?
The LTC1325CN#PBF supports fast charging and management of nickel-cadmium (NiCd), nickel-metal-hydride (NiMH), lithium-ion (Li-ion), and lead-acid batteries. Its programmable DAC reference (16–160mV), configurable fault thresholds (MCV, HTF, LTF), and 4.5V–16V VDD range enable adaptation across these chemistries without hardware changes. The LTC1325CN#PBF does not support lithium-polymer or lithium-iron-phosphate natively - those require different voltage/thermal limits.
How does the LTC1325CN#PBF implement gas gauge functionality?
The LTC1325CN#PBF implements gas gauge functionality by measuring the voltage across the external sense resistor (RSENSE) during discharge, filtering it with an internal 1kΩ resistor and external capacitor (CF), amplifying it with a fixed inverting gain of four, and converting it via its 10-bit ADC. The host µP accumulates these readings over time to compute total charge removed. This method is implemented in the LTC1325CN#PBF's dedicated gas gauge mode and requires no external op-amps or integrators.
Can the LTC1325CN#PBF charge batteries with voltages exceeding its VDD supply?
Yes, the LTC1325CN#PBF can charge batteries with voltages greater than VDD. Its VBAT pin accepts battery voltages up to VDD + 0.3V (absolute max), and the internal programmable voltage divider (1:1 to 1:16) normalizes measurements per cell. When used with an external buck converter topology driven by PGATE, the LTC1325CN#PBF regulates current regardless of battery voltage - enabling charging of 12V or 16V packs from a 5V or 12V supply rail.
What is the purpose of the FILTER pin on the LTC1325CN#PBF?
The FILTER pin on the LTC1325CN#PBF connects to an external capacitor (CF) that forms a low-pass RC filter with an internal 1kΩ resistor (RF). During charging, CF reduces PWM switching noise on the battery voltage measurement path. In gas gauge mode, this same RC network averages the SENSE pin voltage to enable accurate Coulomb counting. Typical CF values range from 1µF to 10µF depending on desired cutoff frequency and discharge current ripple.
Does the LTC1325CN#PBF require external components for basic operation?
Yes, the LTC1325CN#PBF requires several external components for full functionality: a ≥4.7µF capacitor on REG (Pin 1), an external sense resistor (RSENSE) on SENSE (Pin 11), a filter capacitor (CF) on FILTER (Pin 10), thermistor networks for TBAT (Pin 14) and TAMB (Pin 13), resistive dividers for MCV/HTF/LTF (Pins 7/8/6), and external PFET (PGATE, Pin 17) and discharge transistor (DIS, Pin 16). Minimal operation (e.g., ADC reads only) can omit some elements, but charging and safety features require the full complement.
LTC1325CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 18-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 18-DIP
LTC1325CN#PBF FAQ
1.How can I place an order for LTC1325CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1325CN#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 LTC1325CN#PBF reliable?
The price and inventory of LTC1325CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1325CN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1325CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1325CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1325CN#PBF?
LTC1325CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1325CN#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 LTC1325CN#PBF?
For technical support, including LTC1325CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1325CN#PBF requirements.
6.How does Aetrix verify that LTC1325CN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1325CN#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 LTC1325CN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1325CN#PBF?
All LTC1325CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1325CN#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 LTC1325CN#PBF part is unused and in its original packaging.
Return procedure for LTC1325CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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