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Analog Devices Inc. LT1511CSW#TRPBF
- Part No.:
- LT1511CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1511CSW#TRPBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,219
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Product details
Overview
LT1511CSW#TRPBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage 3A switching battery charger IC for Li-Ion, NiMH, and NiCd chemistries. It integrates a 4A peak internal NPN switch, 200kHz current-mode PWM controller, 0.5% reference voltage accuracy, input current limiting loop, and ground-sense current monitoring. It enables simultaneous equipment operation and battery charging from 11V–28V wall adapters in portable computing and medical devices.
For engineers reviewing the LT1511CSW#TRPBF datasheet, LT1511CSW#TRPBF pinout, LT1511CSW#TRPBF application, or LT1511CSW#TRPBF equivalent, key selection criteria include its 3A DC charging capability, dual-loop (battery current + adapter current) regulation, 3µA sleep-mode quiescent current, and SO-24 wide-body thermal performance with θJA = 30°C/W.
Technical Context
The LT1511CSW#TRPBF implements a current-mode buck topology with three independent control loops: battery charging current (via PROG pin and CA1 amplifier), battery voltage regulation (via OVP pin and VA amplifier with 2.465V ±0.5% reference), and adapter input current limiting (via CLP/CLN pins and CL1 amplifier with 100mV threshold). Its internal NPN switch operates at 200kHz with 0.25Ω typical ON resistance and supports up to 4A peak current.
It features adaptive undervoltage lockout (UV pin threshold 6.7V with 0.5V hysteresis), VC pin-based soft-start (0.33µF capacitor), and automatic sleep mode (3µA IQ) when VCC drops below battery voltage by >0.7V. Battery negative terminal connects directly to GND-no high-side sensing required-and reverse battery drain is limited to 3µA when adapter is disconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Charging Current | Programmable up to 3A DC (4A peak); set via RPROG, RS1, RS2 with ±5% accuracy. |
| Reference Voltage Accuracy | 2.465V ±0.5% at 25°C; ensures Li-Ion float voltage compliance within ±1% over full temperature range. |
| Switching Frequency | 200kHz nominal (170–230kHz over temp); enables compact 20µH inductor and low EMI design. |
| Adapter Input Current Limit | Configurable via CLP/CLN; 100mV threshold allows precise current limiting without external op-amps. |
| Quiescent Current (Sleep Mode) | 3µA typical; minimizes battery self-discharge when wall adapter is unplugged. |
| Thermal Resistance (θJA) | 30°C/W (SO-24 wide package); supports full 3A charging at TA ≤ 60°C with proper PCB copper area. |
| Operating VCC Range | 8V to 28V; requires ≥3V headroom above VBAT for proper regulation. |
Pinout & Package
LT1511CSW#TRPBF is housed in a 24-lead plastic SO wide (SW) package with exposed thermal paddle. All seven GND pins (1, 4, 5, 7, 16, 23, 24) are fused to the internal die attach paddle and must be connected to an expanded PCB copper land for effective heat sinking. Three VCC pins (20, 21, 22) must be shorted together near the IC for low-impedance supply decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,4,5,7,16,23,24) | Power and signal ground reference | Fused to thermal paddle; mandatory connection to large PCB copper pour for thermal management (θJA = 30°C/W). |
| SW (2) | Switch node output | Drives external Schottky catch diode; requires minimal trace length to GND to minimize ringing and EMI. |
| BOOST (3) | Bootstrap drive for internal NPN switch | VBOOST = VCC + VBAT during ON time; max 57V relative to GND; critical for low RON and efficiency. |
| UV (6) | Undervoltage lockout input | 6.7V rising threshold with 0.5V hysteresis; prevents operation below adapter minimum; floating causes 200µA reverse drain. |
| OVP (8) | Voltage amplifier input | Monitors battery voltage via R3/R4 divider; 2.465V reference sets Li-Ion float point; input bias <3nA enables high-impedance dividers. |
| CLP / CLN (9,10) | Adapter current limit differential inputs | 100mV threshold enables closed-loop adapter current regulation; requires RC filter to reject 200kHz switching noise. |
| SENSE (12) / BAT (14) | Current sense amplifier inputs | Supports ground-referenced sensing (BAT to GND); SENSE accepts either side of sense resistor RS1. |
| VC (18) | Current mode PWM control voltage | 0.7V start threshold; 1.1V = full current; capacitor on VC sets soft-start ramp rate and filters noise. |
| PROG (19) | Charging current programming input | Accepts DAC sink current or resistor-programmed IPROG; VPROG ≈ 2.465V during regulation; short to GND disables switching. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-loop regulation | Simultaneous control of battery charge current, battery voltage, and adapter input current-enables safe concurrent system operation and charging without adapter overload. |
| Ground-referenced current sensing | Eliminates need for high-side current sense amplifiers or isolated supplies; BAT pin connects directly to battery negative terminal. |
| Adaptive UVLO with status output | UV pin provides programmable lockout (6.7V threshold); UVOUT open-collector output signals valid VCC to host system for power sequencing. |
| Low-power sleep mode | 3µA quiescent current when adapter is removed; prevents excessive battery drain during storage or transport. |
| Integrated 4A peak NPN switch | Reduces BOM count and layout complexity; 0.25Ω typical RON at 3A delivers >90% efficiency in typical 4.2V Li-Ion charger designs. |
Applications
| Laptop Battery Charging System | Medical Portable Monitor Power Management |
|---|---|
Use Scenario: Dual-battery charging in field-deployable diagnostic monitors with continuous AC-powered operation. IC Role / Device Role / Timing Role: Primary battery charger IC managing CC/CV profiles for two 2S Li-Ion packs while regulating total adapter draw to avoid tripping hospital-grade power supplies. Use Value: Enables uninterrupted device uptime during battery replacement; adapter current limiting prevents brownouts when monitor subsystems activate simultaneously. |
Use Scenario: Rechargeable power supply for handheld ultrasound probes requiring fast turnaround between patient exams. IC Role / Device Role / Timing Role: Constant-current charger delivering 3A to 3.7V single-cell Li-Ion packs with precise 4.2V termination and automatic sleep on disconnection. Use Value: Achieves >95% charge completion in under 45 minutes; 3µA sleep current extends shelf life to >12 months without maintenance cycling. |
| Industrial Handheld Scanner | Emergency Communication Radio |
Use Scenario: Ruggedized barcode scanner operating in warehouses with intermittent AC access and frequent battery swaps. IC Role / Device Role / Timing Role: Battery management IC providing programmable 1.5A–3A charging, undervoltage lockout, and reverse-current blocking during hot-swap events. Use Value: Prevents data loss during battery change via seamless transition to backup capacitor; UVLO avoids erratic behavior during unstable generator power. |
Use Scenario: Tactical radio with mission-critical runtime requirements and field-replaceable Li-Ion packs charged from vehicle 12V or solar sources. IC Role / Device Role / Timing Role: High-efficiency buck charger supporting 11V–28V input range, 3A output, and adapter current limiting to protect automotive alternators. Use Value: Delivers full charge in <60 minutes from 12V vehicle source; CLP/CLN loop prevents alternator overheating during extended charging sessions. |
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 max input, 2A integrated switch, synchronous rectification, I2C programmability; no adapter current limiting loop. | Designed for solar/battery hybrid systems; lacks CLP/CLN interface for adapter load management. | Choose for higher input voltage tolerance and digital configurability where adapter current limiting is unnecessary. |
| BQ24610RGER | TI part with 28V max input, 3A switch, integrated MOSFET drivers, but requires external high-side N-channel MOSFET; no internal NPN switch. | Targets cost-sensitive industrial chargers; needs external gate drivers and bootstrap circuitry not required by LT1511CSW#TRPBF. | Choose when designing for production cost optimization and external FET flexibility outweighs integration benefits. |
Compared with LT3652IMSE#TRPBF and BQ24610RGER, the LT1511CSW#TRPBF uniquely combines a fully integrated 4A NPN switch, analog adapter current limiting (CLP/CLN), and ground-referenced sensing in a single SO-24 package-reducing component count and layout risk for portable equipment requiring robust concurrent operation.
Availability
LT1511CSW#TRPBF is available at Aetrix Electronics and suitable for laptop battery charging systems, portable medical monitors, industrial handheld scanners, and emergency communication radios requiring stable component supply across long product lifecycles.
Supply support for LT1511CSW#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 acquired Linear Technology in 2017 and maintains full technical support, datasheet documentation, and long-term manufacturing commitment for legacy Linear products including the LT1511 family.
The LT1511 belongs to Linear's precision battery charger IC product line, designed specifically for high-efficiency, multi-chemistry charging in space-constrained portable electronics where reliability, thermal performance, and analog loop integrity are critical.
FAQ
What is the maximum battery voltage supported by the LT1511CSW#TRPBF?
The LT1511CSW#TRPBF supports battery voltages from 1V to 20V. Its OVP amplifier and 2.465V reference enable accurate constant-voltage regulation for common configurations including single-cell (4.2V), 2S (8.4V), 3S (12.6V), and 4S (16.8V) Li-Ion packs. The IC maintains ±1% voltage accuracy over temperature, making it suitable for precision float charging across this full range.
Does the LT1511CSW#TRPBF require an external blocking diode?
No, the LT1511CSW#TRPBF does not require an external blocking diode. When the wall adapter is unplugged, the IC enters sleep mode and draws only 3µA from the battery. Its internal architecture prevents reverse current flow through the SW node, eliminating the need for a series diode and associated forward-voltage drop and power loss.
How is charging current programmed on the LT1511CSW#TRPBF?
Charging current on the LT1511CSW#TRPBF is programmed via the PROG pin using either a resistor network (RPROG, RS1, RS2) or a microprocessor-controlled DAC. The core relationship is IBAT = (2.465V / RPROG) × (RS2 / RS1). With RPROG = 4.93kΩ and RS1 = 0.033Ω, the LT1511CSW#TRPBF delivers 3A ±5%-verified across temperature and line conditions.
Can the LT1511CSW#TRPBF charge NiMH batteries?
Yes, the LT1511CSW#TRPBF supports NiMH battery charging via its constant-current mode. While it lacks dV/dt or ΔT termination logic, it provides precise current regulation and optional overvoltage protection (OVP) using the same R3/R4 divider. For full NiMH charge termination, external circuitry (e.g., thermistor interface or timer) must be added-consistent with Linear's documented NiMH application guidance.
What thermal design considerations apply to the LT1511CSW#TRPBF in 3A operation?
At 3A output, the LT1511CSW#TRPBF dissipates ~1.2W in typical 16V→8.4V applications. With θJA = 30°C/W, junction temperature rise is ~36°C above ambient. To maintain TJ ≤ 125°C, PCB layout must use the exposed thermal paddle connected to ≥4 cm² of 2-oz copper; derating to 2.5A is recommended above 60°C ambient without forced airflow.
LT1511CSW#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
LT1511CSW#TRPBF FAQ
1.How can I place an order for LT1511CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1511CSW#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 LT1511CSW#TRPBF reliable?
The price and inventory of LT1511CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1511CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1511CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1511CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1511CSW#TRPBF?
LT1511CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1511CSW#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 LT1511CSW#TRPBF?
For technical support, including LT1511CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1511CSW#TRPBF requirements.
6.How does Aetrix verify that LT1511CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1511CSW#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 LT1511CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1511CSW#TRPBF?
All LT1511CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1511CSW#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 LT1511CSW#TRPBF part is unused and in its original packaging.
Return procedure for LT1511CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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