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Analog Devices Inc. LT1513-2CR#PBF
- Part No.:
- LT1513-2CR#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1513-2CR#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CL D2PAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
LT1513-2CR#PBF from Analog Devices (formerly Linear Technology) is a 500kHz current-mode switching regulator configured as a programmable-constant-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, 1% voltage accuracy at 1.245V FB reference, and supports input voltages from 2.7V to 30V - enabling charging when VIN < VBAT, = VBAT, or > VBAT. It is used in multi-cell lithium-ion, NiMH, and lead-acid battery systems requiring ground-referenced current sensing.
For engineers reviewing the LT1513-2CR#PBF datasheet, LT1513-2CR#PBF pinout, LT1513-2CR#PBF application, or LT1513-2CR#PBF equivalent, key selection considerations include its 0mV IFB reference enabling precise external current programming, ground-referenced current sense architecture, 7-pin DD package thermal performance (θJA = 30°C/W), and compatibility with SEPIC converters for wide-input-range battery charging.
Technical Context
The LT1513-2CR#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 regulated) for external current programming - eliminating internal current-sense resistors and enabling direct DC or PWM-controlled ICHRG. Its error amplifier has two inverting inputs (voltage and current paths), with transconductance gm = 1500 µmho and clamp limits of 0.25–2.30V.
It integrates a 500kHz oscillator, 3A peak switch (40V breakdown), soft-start via VC pin, and dual-function S/S pin supporting shutdown (<0.6V) and synchronization (600–800kHz). The LT1513-2 variant removes internal IFB feedback resistors versus LT1513, exposing both IFB input and output for external compensation and programmable current limit design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz typical; minimizes inductor size and enables compact SEPIC designs with 10 µH windings. |
| FB Reference Voltage | 1.245 V ±12 mV; enables 1% constant-voltage regulation critical for Li-ion cell safety and full-charge termination. |
| IFB Reference Voltage | 0 mV (LT1513-2); allows direct external current programming without offset error from internal sense resistor. |
| Max Switch Current | 3.8 A typical; supports ≥2 A battery charging current with margin for transient peaks in SEPIC topology. |
| Input Voltage Range | 2.7 V to 30 V; enables operation with wall adapters, USB-PD sources, or automotive supplies - even below battery voltage. |
| Supply Current | 5.5 mA typical; low quiescent draw preserves system efficiency during active charging. |
| Shutdown Current | 12 µA typical; minimizes battery drain during standby or system sleep modes. |
| Thermal Resistance θJA | 30 °C/W (R package, 0.5 in² copper); requires proper PCB copper pour on TAB/GND for reliable 2A operation. |
Pinout & Package
The LT1513-2CR#PBF is housed in a 7-lead plastic DD (R) package with exposed thermal TAB electrically connected to Pin 4 (GND). The TAB must be soldered to a large ground plane for thermal management and low-inductance return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: VC | Error amplifier output / compensation node | Drives current comparator; voltage (1.0–1.9 V) sets peak switch current; RC network here sets loop stability and soft-start ramp rate. |
| Pin 2: FB | Voltage feedback input | Inverting input to voltage error amp; referenced to 1.245 V; connects to R1/R2 divider setting battery float voltage (e.g., 4.2 V/cell). |
| Pin 3: IFB | Current feedback input (0 mV regulated) | Virtual ground for external current programming; balances ISET across R5/R4 to set ICHARGE = (VISET × R4/R5)/R3. |
| Pin 4: GND | Power and signal ground reference | Common return for control circuitry, switch current, and TAB; all Kelvin connections (VC, FB, S/S) must tie directly here. |
| Pin 5: VSW | Switch collector node | Carries up to 3 A pulsed current; requires short, low-inductance trace to C2/D1/C1 loop to suppress voltage spikes and EMI. |
| Pin 6: S/S | Shutdown/synchronization input | Logic-compatible pin: <0.6 V = shutdown (12 µA IQ); 600–800 kHz AC = sync; floating = enabled. |
| Pin 7: VIN | Main power supply input | Accepts 2.7–30 V; bypassed with low-ESR 22 µF tantalum capacitor placed adjacent to pin and ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-referenced current sensing | IFB regulated at 0 mV enables direct connection of R3 sense resistor to ground - simplifying layout, eliminating floating sense amps, and avoiding battery-side grounding conflicts. |
| Programmable constant-current mode | Supports linear DC or PWM-based ISET inputs; ICHARGE scales precisely with VISET × (R4/R5)/R3 - enabling dynamic charge profile control in microcontroller-managed systems. |
| SEPIC topology optimization | Integrated dual-loop control, 500 kHz switching, and 40 V switch rating allow efficient, bidirectional VIN-to-VBAT conversion - charging even when input is lower than battery voltage. |
| Low-offset voltage loop | 1.245 V FB reference with ±12 mV tolerance and 0.03 %/V line regulation ensures stable CV termination across input voltage variations and temperature. |
| Thermally enhanced R package | Exposed TAB + 7-pin DD footprint provides 30 °C/W θJA with proper PCB copper; enables 2 A continuous charging without external heatsink in industrial ambient conditions. |
Applications
| Lithium-Ion Multi-Cell Pack Charging | Industrial Portable Equipment Power Management |
|---|---|
Use Scenario: Charging 2–4 series Li-ion cells (8.4–16.8 V) from variable-input wall adapters or USB-C PD sources where VIN may dip below battery voltage during brownout. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger IC implementing SEPIC topology with dual-loop regulation and ground-referenced current sensing. Use Value: Enables safe, accurate full-charge termination (±1% CV) and programmable CC current (via 0 mV IFB) without battery-side current shunt or isolation components. | Use Scenario: Rechargeable handheld test instruments or ruggedized data loggers requiring long runtime, field-replaceable batteries, and robust charging under fluctuating input conditions. IC Role / Device Role / Timing Role: Primary battery charger controller managing charge profiles, input fault response, and thermal derating via VC pin monitoring. Use Value: Delivers 2 A charging current with minimal BOM count (single inductor core, no optocoupler), while supporting shutdown/sync for system-level power sequencing. |
| NiMH/NiCd Smart Charger Module | Lead-Acid Backup System Charger |
Use Scenario: Programmable benchtop or embedded charger for NiMH/NiCd packs with delta-V or dT/dt termination, requiring adjustable current limit and voltage ceiling. IC Role / Device Role / Timing Role: Precision CC/CV regulator with externally programmable current threshold and 1.245 V reference adaptable to 1.4–1.5 V/cell NiMH float voltage. Use Value: Eliminates need for discrete op-amps and DACs by using IFB as virtual ground - reducing component count and improving current-setting accuracy over temperature. | Use Scenario: Off-grid solar or UPS backup systems charging 12 V sealed lead-acid (SLA) batteries from unregulated PV or generator inputs with wide VIN range (8–30 V). IC Role / Device Role / Timing Role: High-efficiency SEPIC charger IC providing constant-current bulk charge and constant-voltage absorption phases with thermal foldback. Use Value: Maintains regulation down to 2.7 V input, avoids battery discharge path when off, and supports high ripple input without additional filtering - lowering system cost and footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | Requires external MOSFETs; supports higher voltage (up to 32 V battery), but lacks integrated 3 A switch and 0 mV IFB reference. | Better suited for high-power (>3 A) or high-voltage (>20 V) battery systems; not drop-in for LT1513-2CR#PBF's integrated SEPIC function. | Select LTC4000-1 only when designing scalable multi-chemistry chargers needing external FET control and wider battery voltage range. |
| MAX1771 | Fixed 100 mV current-sense threshold (not 0 mV); no IFB virtual-ground architecture; lower max switch current (2.5 A). | Compatible with basic SEPIC charging but lacks precision programmability and ground-referenced current sensing - limiting accuracy in low-current or multi-chemistry use cases. | Choose MAX1771 only for cost-sensitive, single-chemistry applications where ±5% current accuracy suffices and external current programming is unnecessary. |
Compared with LTC4000-1 and MAX1771, the LT1513-2CR#PBF uniquely combines an integrated 3 A switch, 0 mV IFB virtual ground for direct current programming, and optimized SEPIC control - making it the most compact, accurate solution for ≤2 A, ≤20 V battery charging where ground-referenced sensing and minimal BOM are critical.
Availability
LT1513-2CR#PBF is available at Aetrix Electronics and suitable for lithium-ion pack charging, industrial portable equipment power management, NiMH smart charger modules, and lead-acid backup system chargers requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LT1513-2CR#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision, reliability, and innovation.
The LT1513 family was designed specifically for high-efficiency, wide-input-range battery charging using SEPIC or flyback topologies - targeting applications demanding ground-referenced current sensing, programmable charge profiles, and robust operation across automotive and industrial temperature ranges.
FAQ
What is the primary function of the IFB pin on the LT1513-2CR#PBF?
The IFB pin on the LT1513-2CR#PBF is a current feedback input regulated at 0 mV, serving as a virtual ground for external current programming. Unlike the LT1513 (–100 mV IFB), this 0 mV reference allows direct connection of a precision current-sense resistor (R3) to ground and enables accurate ICHARGE control via external voltage (ISET) applied across R5/R4. This architecture eliminates offset errors from internal sense resistors and simplifies multi-chemistry charge profile implementation in the LT1513-2CR#PBF.
Can the LT1513-2CR#PBF charge batteries when input voltage is lower than battery voltage?
Yes, the LT1513-2CR#PBF can charge batteries when input voltage is lower than battery voltage because it is optimized for SEPIC topology - which inherently supports buck-boost operation. With proper magnetics (e.g., coupled 10 µH windings) and component selection, the LT1513-2CR#PBF maintains regulation across VIN = 2.7–30 V and VBAT up to 20 V, enabling charging from low-voltage sources like partially discharged USB ports or 5 V wall adapters into 8.4 V or 12 V battery packs.
What package type and thermal characteristics does the LT1513-2CR#PBF use?
The LT1513-2CR#PBF uses a 7-lead plastic DD (R) package with an exposed thermal TAB electrically tied to Pin 4 (GND). With 0.5 in² copper area on the PCB ground plane, its thermal resistance is θJA = 30°C/W. This allows continuous 2 A charging current at TA ≤ 70°C without forced airflow. The TAB must be soldered directly to the ground plane; failure to do so risks thermal shutdown or reduced current capability in the LT1513-2CR#PBF.
How does the LT1513-2CR#PBF differ from the standard LT1513 in terms of current sensing?
The LT1513-2CR#PBF differs from the LT1513 by removing internal feedback resistors around the IFB amplifier and connecting its output directly to the FB node. This yields a 0 mV IFB reference (vs –100 mV on LT1513), enabling true ground-referenced current sensing and external current programming. The LT1513-2CR#PBF exposes both IFB input and output pins for custom loop compensation - a key distinction that supports higher-accuracy, microcontroller-driven charge profiles not possible with the base LT1513.
What is the recommended input capacitor for stable operation of the LT1513-2CR#PBF?
The recommended input capacitor for the LT1513-2CR#PBF is a low-ESR 22 µF, 25 V solid tantalum capacitor (e.g., AVX TPS or Sprague 593D), placed directly between VIN (Pin 7) and GND (Pin 4) with shortest possible trace length. A parallel 4.7 µF ceramic capacitor improves high-frequency decoupling. This combination handles RMS ripple currents <0.25 A (at 10 µH inductance) and prevents voltage droop during switch turn-on - ensuring stable regulation and preventing damage from hot-switching surges in the LT1513-2CR#PBF.
LT1513-2CR#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1513-2CR#PBF FAQ
1.How can I place an order for LT1513-2CR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1513-2CR#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 LT1513-2CR#PBF reliable?
The price and inventory of LT1513-2CR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1513-2CR#PBF is usually 5 days.
3.What payment methods are accepted for LT1513-2CR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1513-2CR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1513-2CR#PBF?
LT1513-2CR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1513-2CR#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 LT1513-2CR#PBF?
For technical support, including LT1513-2CR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1513-2CR#PBF requirements.
6.How does Aetrix verify that LT1513-2CR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1513-2CR#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 LT1513-2CR#PBF meets industry standards.
7.What is the process for return or replacement of LT1513-2CR#PBF?
All LT1513-2CR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1513-2CR#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 LT1513-2CR#PBF part is unused and in its original packaging.
Return procedure for LT1513-2CR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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