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Analog Devices Inc. LT1511ISW#TRPBF
- Part No.:
- LT1511ISW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1511ISW#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,289
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Product details
Overview
LT1511ISW#TRPBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage 3A switching battery charger IC designed for Li-Ion, NiMH, and NiCd chemistries. It integrates a 4A peak internal NPN switch, operates at 200kHz, delivers ±0.5% voltage reference accuracy, supports 1V–20V battery range, and features independent adapter current limiting to enable simultaneous system operation and charging.
For engineers reviewing the LT1511ISW#TRPBF datasheet, LT1511ISW#TRPBF pinout, LT1511ISW#TRPBF application, or LT1511ISW#TRPBF equivalent, key selection criteria include its 3A DC charging capability, input current limiting loop, ground-sensed current architecture, thermal performance in the 24-lead SO Wide package, and compatibility with resistor- or DAC-based charging current programming.
Technical Context
The LT1511ISW#TRPBF implements a current-mode PWM buck topology with three independent control loops: constant-current regulation via PROG-pin feedback, constant-voltage regulation using the 2.465V reference and OVP amplifier, and adapter input current limiting via CLP/CLN differential sensing. Its internal NPN switch achieves 0.15Ω typical ON resistance and operates with BOOST-driven saturation for low conduction loss.
It supports battery voltage sensing at either terminal (BAT/SENSE), requires no external blocking diode due to sleep-mode reverse leakage of only 3µA, and uses VC pin soft-start (0.33µF) to ramp charging current over ~10ms. Undervoltage lockout is implemented at 6.7V (UV pin) with 0.5V hysteresis, and thermal shutdown protects against junction temperatures exceeding 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charging Current | 3A DC output (4A peak); programmable within ±5% via RPROG or DAC at PROG pin |
| Reference Voltage Accuracy | ±0.5% at 25°C, ±1% over full temperature; enables precise Li-Ion CV termination at 4.2V/cell |
| Switching Frequency | 200kHz typical (170–230kHz over temp); balances efficiency, inductor size, and EMI |
| Battery Voltage Range | 1V to 20V; supports single-cell Li-Ion up to 5-series NiCd/NiMH packs without level-shifting |
| Adapter Current Limit | Programmable 100mV threshold at CLP/CLN; enables dynamic load sharing between system and battery |
| Quiescent Drain (No Adapter) | 3µA sleep-mode current; prevents significant battery discharge when wall adapter is disconnected |
| Thermal Resistance θJA | 30°C/W (SO Wide package with internal paddle GND); supports full 3A charging at ≤60°C ambient with proper PCB copper |
Pinout & Package
LT1511ISW#TRPBF is housed in a 24-lead plastic SO Wide (SW) package with exposed internal GND paddle for thermal dissipation. All seven GND pins (1, 4, 5, 7, 16, 23, 24) are fused to the die attach paddle and must be connected to expanded PCB copper lands for effective heat sinking. VCC pins (20, 21, 22) must be shorted together near the package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (2) | Switch Output | Drives external Schottky catch diode; voltage swings from GND to VBAT during operation |
| BOOST (3) | Bootstrap Driver | Supplies gate drive to internal NPN switch; VBOOST = VCC + VBAT when active; max 57V wrt GND |
| UV (6) | Undervoltage Lockout Input | Rising threshold 6.7V (0.5V hysteresis); disables switching if adapter drops below lockout level |
| OVP (8) | Voltage Sense Input | Connects to battery voltage divider; 2.465V reference sets CV float voltage (e.g., 4.2V for Li-Ion) |
| CLP / CLN (9,10) | Adapter Current Sense Inputs | Differential pair measuring voltage across RS4; 100mV threshold enables real-time input current limiting |
| SENSE (12) / BAT (14) | Current Sense Terminals | Enable high-side or low-side current sensing; no ground isolation required for battery negative |
| VC (18) | Current Mode Control | 0.7V start threshold; 0–1.1V range controls charging current; soft-start capacitor (≥0.33µF) filters noise |
| PROG (19) | Charging Current Programming | Accepts current source (e.g., from CA1) or DAC sink; IPROG = 2.465V/RPROG × (RS2/RS1) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4A Peak Switch | Eliminates external power transistor; reduces BOM count and layout complexity in portable chargers |
| Three-Loop Control Architecture | Simultaneously regulates battery current, battery voltage, and adapter input current-enabling concurrent system use and charging |
| Ground-Referenced Current Sensing | Allows direct connection of battery negative to system GND; avoids isolated sense amplifiers or high-side MOSFETs |
| 0.5% Reference Voltage Accuracy | Meets stringent Li-Ion CV tolerance requirements without external trimming or calibration |
| Automatic Sleep Mode | Reduces reverse battery drain to 3µA when adapter is removed-critical for long-term storage of battery-powered devices |
| Thermally Optimized SO Wide Package | Internal paddle GND and 30°C/W θJA enable full 3A operation without heatsink in compact industrial or medical chargers |
Applications
| Laptop Battery Charging System | Industrial Portable Test Equipment |
|---|---|
Use Scenario: Charging dual-cell Li-Ion (8.4V) pack while powering CPU, display, and peripherals from same AC adapter. IC Role / Device Role / Timing Role: LT1511ISW#TRPBF acts as primary battery charger controller, managing CC/CV profile and dynamically throttling charge current to prevent adapter overload. Use Value: Enables uninterrupted device operation during charging; eliminates need for separate system power rail or complex load-sharing firmware. |
Use Scenario: Rechargeable handheld multimeter with NiMH battery pack operating in field environments with variable input voltage. IC Role / Device Role / Timing Role: LT1511ISW#TRPBF provides robust, temperature-stable charging with undervoltage lockout and automatic shutdown on adapter removal. Use Value: Ensures reliable battery maintenance across wide ambient temperatures (–40°C to 85°C industrial grade) and prevents accidental deep discharge. |
| Medical Infusion Pump Backup Power | Emergency Lighting Power Management |
Use Scenario: Maintaining sealed lead-acid or Li-Ion backup battery in Class II medical device requiring continuous runtime certification. IC Role / Device Role / Timing Role: LT1511ISW#TRPBF serves as certified charging engine, delivering precise CV float voltage and monitoring adapter health via UV/CLP loops. Use Value: Meets IEC 60601-1 leakage and reliability requirements through low-noise design, minimal reverse drain (3µA), and fail-safe shutdown behavior. |
Use Scenario: LED emergency light with integrated 3.7V Li-Ion battery, requiring maintenance charging during grid operation and autonomous discharge during outage. IC Role / Device Role / Timing Role: LT1511ISW#TRPBF functions as intelligent charger and battery supervisor, entering sleep mode when AC fails and enabling fast recharge upon restoration. Use Value: Guarantees >90% battery capacity retention after 12-month standby via ultra-low quiescent current and accurate CV regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652IMSE#TRPBF | 42V input rating, 2A max charge current, integrated MOSFET, 1.2MHz switching frequency | Better suited for automotive (42V) or space-constrained designs; lacks independent adapter current limiting loop | Select when higher input voltage tolerance or smaller solution size is prioritized over 3A output and adapter-aware charging |
| BQ24610RGER | TI part with 3.5A charge current, 28V max input, integrated MOSFETs, I2C interface, and battery thermistor monitoring | Requires microcontroller interface and external NTC circuit; adds telemetry but increases firmware overhead | Select when digital control, battery temperature safety, or multi-chemistry auto-detection is required |
Compared with LT1511ISW#TRPBF, LT3652IMSE#TRPBF trades adapter current limiting and 3A capability for higher input voltage and smaller footprint, while BQ24610RGER adds digital configurability and safety monitoring at the cost of analog simplicity and standalone operation.
Availability
LT1511ISW#TRPBF is available at Aetrix Electronics and suitable for laptop battery charging systems, industrial portable test equipment, medical infusion pump backup power, and emergency lighting power management requiring stable component supply, long-lifecycle support, and industrial-grade temperature performance.
Supply support for LT1511ISW#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1511ISW#TRPBF belongs to Linear's legacy high-efficiency battery charger IC family, engineered specifically for cost-sensitive, high-reliability portable and industrial charging applications where analog precision, thermal robustness, and minimal external components are critical.
FAQ
What is the maximum battery voltage supported by the LT1511ISW#TRPBF?
The LT1511ISW#TRPBF supports battery voltages from 1V to 20V, enabling use with single-cell Li-Ion (4.2V), two-cell Li-Ion (8.4V), three-cell Li-Ion (12.6V), four-cell Li-Ion (16.8V), and five-cell configurations. The OVP amplifier and 2.465V reference allow precise float voltage setting across this full range using standard resistor dividers.
Does the LT1511ISW#TRPBF require an external blocking diode?
No, the LT1511ISW#TRPBF does not require an external blocking diode. When the wall adapter is disconnected, the IC enters sleep mode and draws only 3µA from the battery. This eliminates reverse current path concerns and simplifies bill-of-materials compared to discrete switch-based chargers.
How is charging current programmed on the LT1511ISW#TRPBF?
Charging current on the LT1511ISW#TRPBF is programmed via the PROG pin using the formula IBAT = (2.465V / RPROG) × (RS2 / RS1). A typical configuration uses RPROG = 4.93kΩ, RS1 = 0.033Ω, and RS2 = RS3 = 200Ω to achieve 3A ±5%. Alternatively, a DAC output can sink current into PROG for dynamic control.
What is the purpose of the CLP and CLN pins on the LT1511ISW#TRPBF?
The CLP and CLN pins on the LT1511ISW#TRPBF form a differential input for the adapter current limit amplifier (CL1). A sense resistor (RS4) placed between them sets the input current threshold (e.g., 100mV/RS4). This enables real-time reduction of charging current to prevent adapter overload while maintaining system operation.
Can the LT1511ISW#TRPBF charge NiMH batteries safely?
Yes, the LT1511ISW#TRPBF can safely charge NiMH batteries using its constant-current mode and optional overvoltage protection via the OVP pin. While it lacks built-in dV/dt or ΔT termination, external comparators (e.g., LT1011) can detect voltage inflection or temperature rise and signal the LT1511ISW#TRPBF to reduce current via the VC pin.
LT1511ISW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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:
- Over Voltage
- Charge Current - Max:
- 3A
- Battery Pack Voltage:
- 20V (Max)
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
LT1511ISW#TRPBF FAQ
1.How can I place an order for LT1511ISW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1511ISW#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 LT1511ISW#TRPBF reliable?
The price and inventory of LT1511ISW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1511ISW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1511ISW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1511ISW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1511ISW#TRPBF?
LT1511ISW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1511ISW#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 LT1511ISW#TRPBF?
For technical support, including LT1511ISW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1511ISW#TRPBF requirements.
6.How does Aetrix verify that LT1511ISW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1511ISW#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 LT1511ISW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1511ISW#TRPBF?
All LT1511ISW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1511ISW#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 LT1511ISW#TRPBF part is unused and in its original packaging.
Return procedure for LT1511ISW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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