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Analog Devices Inc. LT1513-2IR#PBF
- Part No.:
- LT1513-2IR#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1513-2IR#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CL D2PAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:115
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Product details
Overview
LT1513-2IR#PBF from Analog Devices (formerly Linear Technology) is a 500kHz current-mode switching regulator configured as a programmable-current/constant-voltage battery charger for SEPIC or flyback topologies. It delivers up to 2A charging current, features 0mV current-sense reference for external current programming, supports input voltages from 2.4V to 30V, and maintains 1% voltage accuracy for lithium-ion cells. It enables charging when input voltage is below battery voltage - ideal for USB-powered multi-cell Li-ion systems.
For engineers reviewing the LT1513-2IR#PBF datasheet, LT1513-2IR#PBF pinout, LT1513-2IR#PBF application, or LT1513-2IR#PBF equivalent, key selection considerations include its ground-referenced IFB pin (0mV regulation), 3A internal switch, 500kHz fixed-frequency operation, thermal design with R-package θJA = 30°C/W, and compatibility with programmable CC/CV charging architectures requiring precise external current control.
Technical Context
The LT1513-2IR#PBF implements dual-loop current-mode control: the FB pin regulates output voltage via a 1.245V internal reference, while the IFB pin serves as a virtual ground (0mV) for externally programmed charging current. Its error amplifier provides 1500 µmho transconductance and supports external compensation via the VC pin, enabling stable loop response across varying battery impedance and input conditions.
Unlike the LT1513 variant, the LT1513-2 removes internal IFB feedback resistors and exposes both input and output of the current-sense amplifier - allowing direct DC or PWM-based current programming without signal inversion. The integrated 500kHz oscillator, antisaturation driver, and 40V switch breakdown voltage support robust operation in wide-input SEPIC configurations where VIN may be lower than VBAT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz ±10% - minimizes inductor size and enables compact SEPIC designs with 10 µH coupled windings. |
| Max Switch Current | 3.0 A typical - supports up to 2 A continuous battery charging current with margin for peak loads. |
| IFB Reference Voltage | 0 mV (LT1513-2 only) - enables ground-referenced current programming using external op-amp or DAC. |
| FB Reference Voltage | 1.245 V ±1.1% - ensures ≤1% constant-voltage accuracy critical for safe Li-ion float charging. |
| Input Voltage Range | 2.4 V to 30 V - allows operation from single-cell LiPo, USB, or industrial 24V rails without pre-regulation. |
| Switch Breakdown Voltage | 40 V - supports SEPIC topologies where VSW = VIN + VBAT, e.g., 12V input + 8.4V battery = 20.4V stress. |
| Thermal Resistance (θJA) | 30 °C/W (R package, 0.5 in² copper) - requires PCB thermal pad connection to ground plane for >1W dissipation. |
Pinout & Package
The LT1513-2IR#PBF uses a 7-lead plastic DD (R) package with exposed thermal tab electrically connected to GND. The tab must be soldered to a dedicated ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Drives current comparator threshold; 1V–1.9V range sets 0–3.6A switch current; requires RC network to GND for stability. |
| FB (Pin 2) | Voltage feedback input | Inverting input to voltage error amp; referenced to 1.245V internal bandgap; senses battery voltage via R1/R2 divider. |
| IFB (Pin 3) | Current feedback input (0mV virtual ground) | Ground-referenced node for external current programming; accepts DC or PWM ISET signals; no internal bias resistor. |
| GND (Pin 4) | Power and signal ground | Common return for control circuitry, switch current, and thermal tab; Kelvin connection required for FB/IFB/VC traces. |
| VSW (Pin 5) | Internal switch collector | Carries up to 3A pulsed current; fast edges require short, low-inductance routing to minimize EMI and voltage spikes. |
| S/S (Pin 6) | Shutdown/synchronization input | Logic-compatible pin: <0.6V shuts down IC (12µA IQ); 600–800kHz AC signal synchronizes switching frequency. |
| VIN (Pin 7) | Input supply | Accepts 2.4–30V; requires local low-ESR capacitor (e.g., 22µF tantalum) connected directly to GND pin and thermal tab. |
Key Features
| Feature | Design Value |
|---|---|
| 0mV IFB reference | Enables precision external current programming without level-shifting circuitry or inverted sense signals. |
| SEPIC topology support | Allows charging when input voltage is below, equal to, or above battery voltage - eliminates need for buck-boost pre-regulators. |
| Integrated 500kHz oscillator | Reduces external component count; fixed frequency simplifies EMI filtering and avoids subharmonic instability in current mode. |
| 3A internal NPN switch | Supports high-efficiency single-stage charging up to 2A for 1–2 cell Li-ion packs without external MOSFETs. |
| 1% CV accuracy | Meets JEITA and IEC 62133 requirements for lithium-ion termination voltage tolerance during constant-voltage phase. |
Applications
| USB-Powered Portable Medical Device | Lithium-Ion Power Bank Charger |
|---|---|
Use Scenario: Charging a 7.4V (2S) Li-ion pack from a 5V USB source with strict thermal limits and no external DC-DC stage. IC Role / Device Role / Timing Role: Primary SEPIC controller regulating both constant-current (1.5A) and constant-voltage (8.4V) phases; 500kHz timing sets inductor/capacitor sizing. Use Value: Eliminates need for buck-boost converter; 0mV IFB allows microcontroller-based adaptive charge current scaling via DAC. | Use Scenario: Multi-port power bank supporting simultaneous charging from wall adapter (12V) and discharging to USB devices. IC Role / Device Role / Timing Role: Battery charging controller managing CC/CV profile for 8.4V pack; S/S pin used for system-level enable/disable coordination. Use Value: Input voltage flexibility (5–12V) enables shared adapter use; 1% voltage accuracy prevents overcharge degradation over 500+ cycles. |
| Industrial Handheld Scanner | Emergency Lighting Backup System |
Use Scenario: Recharging a 3.7V Li-ion cell from a 3.3V auxiliary rail generated by energy harvesting circuitry. IC Role / Device Role / Timing Role: Low-input SEPIC charger operating in boost mode; IFB pin driven by PWM from MCU for dynamic current limiting. Use Value: Enables charging at VIN < VBAT; 2.4V minimum input extends usable energy harvest range by >15%. | Use Scenario: Maintaining sealed lead-acid (SLA) backup battery in always-on security lighting with AC/DC adapter input. IC Role / Device Role / Timing Role: Constant-voltage/constant-current supply regulating 13.8V float voltage and 0.5A bulk charge; FB divider set for Pb-acid chemistry. Use Value: Dual-loop architecture prevents overvoltage damage during long-term float; 30V max input withstands AC line surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | External PMOS driver; supports higher voltage (up to 32V battery); no integrated switch; requires external gate driver and sense resistor. | Designed for high-power, multi-chemistry chargers with programmable termination and telemetry; not suitable for cost-sensitive, integrated-switch applications. | Select LTC4000-1 only when >3A charge current, multi-cell series support, or SMBus monitoring are required - not a drop-in replacement. |
| MP2617 | Monolithic 2A switcher with integrated MOSFETs; 4.5–36V input; 0.5% CV accuracy; no IFB virtual-ground programming interface. | Optimized for space-constrained consumer electronics; lacks LT1513-2's flexible 0mV IFB for analog/PWM current control. | Choose MP2617 for simplified layout and tighter voltage tolerance; avoid when external current programming or SEPIC topology is mandatory. |
Compared with LTC4000-1 and MP2617, the LT1513-2IR#PBF uniquely combines an integrated 3A switch, 0mV IFB programmability, and native SEPIC support - making it optimal for mid-power, thermally constrained, and architecturally flexible battery charging where analog current control and input-voltage versatility are essential.
Availability
LT1513-2IR#PBF is available at Aetrix Electronics and suitable for USB-powered portable medical devices, lithium-ion power banks, industrial handheld scanners, and emergency lighting backup systems requiring stable component supply and long-term lifecycle support.
Supply support for LT1513-2IR#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 LT1513 family.
The LT1513 product line was designed specifically for high-efficiency, topology-flexible battery charging in space- and thermal-constrained applications - emphasizing SEPIC/flyback compatibility, ground-referenced sensing, and seamless integration with microcontroller-based charge management.
FAQ
What is the key functional difference between LT1513-2IR#PBF and LT1513IR#PBF?
The LT1513-2IR#PBF features a 0mV IFB pin that acts as a true virtual ground for external current programming, whereas the LT1513IR#PBF regulates IFB at –100mV and includes internal feedback resistors. This makes the LT1513-2IR#PBF suitable for direct DAC or op-amp-based current control without signal inversion or level shifting - a critical distinction for programmable charging systems.
Can LT1513-2IR#PBF operate with input voltage lower than battery voltage?
Yes, the LT1513-2IR#PBF supports SEPIC topology, enabling operation when input voltage is below battery voltage - for example, charging an 8.4V Li-ion pack from a 5V USB source. This is achieved because the SEPIC switch node voltage equals VIN + VBAT, and the LT1513-2IR#PBF's 40V switch rating accommodates this sum safely within its 30V max input limit.
What is the maximum recommended charging current for LT1513-2IR#PBF in continuous operation?
The LT1513-2IR#PBF supports up to 2A continuous charging current under proper thermal conditions: PCB with ≥0.5 in² copper area connected to the exposed thermal tab, ambient temperature ≤60°C, and adequate airflow. At 2A, switch dissipation reaches ~0.64W (with RSW = 0.3Ω), requiring θJA ≤30°C/W to maintain TJ < 125°C.
How does the S/S pin function in LT1513-2IR#PBF, and what are its dual roles?
The S/S pin on the LT1513-2IR#PBF serves two independent functions: logic-level shutdown (<0.6V disables switching, reducing IQ to 12µA) and external synchronization (600–800kHz AC signal locks switching frequency). During sync mode, an internal timer prevents unintended shutdown, allowing reliable clock alignment without compromising system control.
Is LT1513-2IR#PBF compatible with lead-acid battery charging profiles?
Yes, the LT1513-2IR#PBF supports lead-acid charging by configuring the FB divider for 13.8V–14.4V float voltage and setting appropriate current limits via the IFB pin. Its 1% voltage accuracy and programmable constant-current phase meet standard SLA requirements; however, external temperature compensation circuitry must be added for advanced temperature-aware charging.
LT1513-2IR#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- -
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 20V (Max)
- Voltage - Supply (Max):
- 25V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1513-2IR#PBF FAQ
1.How can I place an order for LT1513-2IR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1513-2IR#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 LT1513-2IR#PBF reliable?
The price and inventory of LT1513-2IR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1513-2IR#PBF is usually 5 days.
3.What payment methods are accepted for LT1513-2IR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1513-2IR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1513-2IR#PBF?
LT1513-2IR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1513-2IR#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 LT1513-2IR#PBF?
For technical support, including LT1513-2IR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1513-2IR#PBF requirements.
6.How does Aetrix verify that LT1513-2IR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1513-2IR#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 LT1513-2IR#PBF meets industry standards.
7.What is the process for return or replacement of LT1513-2IR#PBF?
All LT1513-2IR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1513-2IR#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 LT1513-2IR#PBF part is unused and in its original packaging.
Return procedure for LT1513-2IR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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