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Analog Devices Inc. LT1513CR#PBF
- Part No.:
- LT1513CR#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1513CR#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CL D2PAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:753
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Product details
Overview
LT1513CR#PBF from Analog Devices (formerly Linear Technology) is a 500kHz current-mode switching regulator configured as a constant-current/constant-voltage battery charger for SEPIC or flyback topologies. It delivers up to 2A charging current for single Li-ion cells, features 1% voltage regulation accuracy, −100mV current-sense reference (LT1513 variant), and supports input voltages from 2.7V to 30V - enabling charging even when VIN < VBAT. It is used in portable medical devices, industrial handhelds, and backup power systems requiring ground-referred current sensing.
For engineers reviewing the LT1513CR#PBF datasheet, LT1513CR#PBF pinout, LT1513CR#PBF application, or LT1513CR#PBF equivalent, key selection criteria include its 3A internal switch current limit, 500kHz fixed-frequency operation, VC pin-based loop compensation, dual feedback architecture (FB + IFB), and R-package thermal performance (θJA = 30°C/W with proper copper area).
Technical Context
The LT1513CR#PBF implements current-mode control with an internal 500kHz oscillator, antisaturation driver logic, and a dual-input error amplifier that simultaneously regulates output voltage (via FB pin, referenced to 1.245V) and charging current (via IFB pin, regulated to −100mV). Its switch breakdown voltage is 40V, ON resistance is 0.25Ω (typ), and it supports synchronous operation via the S/S pin (600–800kHz range).
Thermal design requires direct TAB-to-ground-plane connection; maximum junction temperature is 125°C. The device integrates a 2.3V low-dropout internal regulator for biasing, enabling stable operation down to 2.7V input. Shutdown current is 12µA (typ) at TJ ≥ 0°C, and soft-start is implemented via external RC on the VC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz (±50kHz); minimizes inductor size and enables compact SEPIC designs. |
| FB Reference Voltage | 1.245V (±12mV); sets precise Li-ion float voltage (e.g., 4.2V with R1/R2 divider). |
| IFB Reference Voltage | −100mV (LT1513 variant); enables accurate ground-referenced current sensing across Rsense. |
| Max Switch Current | 3.0A (min); supports up to 2A battery charge current with margin for transient peaks. |
| Voltage Accuracy | ±1% over line/load/temp; critical for safe lithium-ion cell termination. |
| Supply Current | 4.0–5.5mA (operating); low quiescent draw extends system standby time. |
| Shutdown Current | 12µA (typ); reduces battery drain during idle or fault conditions. |
| Input Voltage Range | 2.7V to 30V; allows operation from USB, 5V rails, or 24V industrial supplies. |
Pinout & Package
The LT1513CR#PBF is housed in a 7-lead plastic DD (R) package with exposed thermal tab electrically connected to GND. The tab must be soldered to ≥0.5 in² copper area on the PCB ground plane for thermal management (θJA = 30°C/W typical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / compensation node | Controls peak switch current (0–3.6A); connects to RC network for loop stability and soft-start. |
| FB (Pin 2) | Voltage feedback input | Inverting input of voltage error amp; senses battery voltage via resistor divider to regulate float voltage. |
| IFB (Pin 3) | Current feedback input | Inverting input of current sense amp; regulated to −100mV for precise CC mode control. |
| GND (Pin 4) | Power and signal ground | Common return for control circuitry, switch current, and Kelvin connections for FB/IFB/S/S. |
| VSW (Pin 5) | Internal switch collector | Carries up to 3A pulsed current; requires short, low-inductance trace to minimize EMI and voltage spikes. |
| S/S (Pin 6) | Shutdown/synchronization input | Logic-compatible pin: low = shutdown (12µA IQ); 600–800kHz AC = frequency sync. |
| VIN (Pin 7) | Input supply | Accepts 2.7–30V; must be bypassed with low-ESR capacitor directly to GND pin and TAB. |
| TAB | Thermal pad / GND | Electrically tied to Pin 4; mandatory low-inductance solder connection to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| SEPIC/Flyback topology support | Enables charging when input voltage is below, equal to, or above battery voltage - no external level-shifting needed. |
| Ground-referenced current sensing | IFB pin regulates to −100mV, eliminating need for high-side current sense amplifiers or isolated sense paths. |
| Dual independent feedback loops | Simultaneous CV (FB) and CC (IFB) regulation ensures clean transition between charge phases without external controllers. |
| Integrated 2.3V LDO bias rail | Allows operation down to 2.7V input while maintaining internal logic and gate drive integrity. |
| Antisaturation switch driver | Adaptively limits power switch saturation, reducing dissipation and enabling fast turn-off for high efficiency. |
| Programmable shutdown & sync | S/S pin provides micropower shutdown and external clock synchronization - simplifies system-level timing coordination. |
Applications
| Portable Medical Monitors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Rechargeable Li-ion battery pack in a battery-powered ECG monitor requiring reliable, low-noise charging with minimal heat generation. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger IC managing full-charge cycle; operates in SEPIC topology to accept variable wall adapter inputs (5–24V) while delivering 4.2V/1.5A to battery. Use Value: 1% voltage accuracy prevents overcharge; ground-referenced current sensing avoids signal coupling into sensitive analog front-end circuits. | Use Scenario: Ruggedized barcode scanner with hot-swappable battery, powered from USB or 12V vehicle supply. IC Role / Device Role / Timing Role: Primary battery charger IC supporting input voltages both above and below battery voltage (e.g., 5V USB → 8.4V 2S Li-ion). Use Value: Enables single-charger design across multiple power sources; 500kHz switching allows small magnetics and reduced board area. |
| Backup Power Systems | Test & Measurement Equipment |
Use Scenario: UPS module for lab instruments using sealed lead-acid or Li-ion backup batteries. IC Role / Device Role / Timing Role: Precision CC/CV charger IC regulating float voltage and absorption current per battery chemistry requirements. Use Value: Programmable current limit and accurate 1.245V reference ensure compliance with IEC 62368-1 battery safety thresholds. | Use Scenario: Portable oscilloscope with integrated rechargeable battery and multi-source input (USB-C PD, 12V DC jack). IC Role / Device Role / Timing Role: Dual-loop charger IC handling wide-input SEPIC conversion and seamless source arbitration. Use Value: 30V max input rating and 40V switch breakdown allow safe operation with 24V industrial adapters; S/S pin enables synchronized switching to avoid beat frequencies with internal clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current/constant-voltage battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000-1 | External MOSFET controller (no internal switch); supports higher power (up to 30W), programmable charge profiles, and SMBus interface. | Requires external N-channel MOSFETs and more complex layout; suited for multi-cell Li-ion or custom chemistries. | Select LTC4000-1 when scalable, microcontroller-managed charging with telemetry is required - not for cost-sensitive, single-chip SEPIC solutions. |
| MP2617 | Monolithic 2A switcher with integrated 50mΩ MOSFETs; fixed 1.2V reference; no IFB pin - uses single FB loop with current-sense resistor in high-side path. | Lacks ground-referenced current sensing; limited to VIN > VBAT configurations unless external boost stage added. | Select MP2617 for simpler, lower-cost Li-ion charging where input always exceeds battery voltage and precision ground-referenced sensing is unnecessary. |
Compared with LTC4000-1 and MP2617, the LT1513CR#PBF uniquely combines an internal 3A switch, −100mV IFB reference for true ground-referenced current control, and native SEPIC support - making it optimal for compact, wide-input-range, single-chip battery chargers where layout simplicity and EMI-sensitive environments matter.
Availability
LT1513CR#PBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld terminals, and backup power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT1513CR#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 LT1513CR#PBF belongs to Linear's high-precision battery charger IC product line, designed specifically for SEPIC/flyback-based charging in space-constrained, thermally sensitive, and multi-input applications where ground-referenced current sensing and input-voltage flexibility are essential.
FAQ
What is the function of the IFB pin on the LT1513CR#PBF?
The IFB pin on the LT1513CR#PBF is the current feedback input, serving as the inverting terminal of a dedicated current-sense amplifier. In constant-current mode, the LT1513CR#PBF regulates this pin to −100mV (typ), enabling precise ground-referenced current sensing across an external sense resistor. This eliminates the need for high-side sensing or isolation, simplifying PCB layout and improving noise immunity in battery charging applications.
Can the LT1513CR#PBF operate with input voltage lower than battery voltage?
Yes, the LT1513CR#PBF can operate with input voltage lower than battery voltage when used in SEPIC topology. Its architecture supports VIN < VBAT, VIN = VBAT, or VIN > VBAT - a key advantage over buck-only or linear chargers. This capability is enabled by the coupled inductor configuration and ground-referenced current sensing, allowing flexible power source integration without additional DC-DC stages.
What is the maximum battery voltage supported by the LT1513CR#PBF?
The LT1513CR#PBF supports battery voltages up to 20V, as confirmed in its Applications section and absolute maximum ratings. This covers single-cell (4.2V), two-cell (8.4V), and three-cell (12.6V) Li-ion packs, as well as 12V lead-acid batteries. The 40V switch breakdown voltage and 30V VIN rating ensure safe operation within this range when using appropriate external components (e.g., coupling capacitor voltage rating ≥ VIN + VBAT).
How does the LT1513CR#PBF achieve thermal stability in high-current applications?
The LT1513CR#PBF achieves thermal stability through its exposed thermal tab (TAB), which is electrically connected to GND and must be soldered to ≥0.5 in² of copper on the PCB ground plane. With θJA = 30°C/W under this condition, the device maintains junction temperatures ≤125°C at full load. Internal features - including antisaturation driver logic and low RDS(on) (0.25Ω typ) - further reduce die heating during 2A+ charging cycles.
Is the LT1513CR#PBF pin-compatible with the LT1513-2CR#PBF?
No, the LT1513CR#PBF is not pin-compatible with the LT1513-2CR#PBF. While both share identical pinout and package (7-lead R), their IFB circuitry differs fundamentally: the LT1513CR#PBF regulates IFB to −100mV for current sensing, whereas the LT1513-2CR#PBF regulates IFB to 0mV and exposes internal amplifier nodes for external programming. Swapping them requires changes to the feedback network and current-sense resistor placement.
LT1513CR#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
LT1513CR#PBF FAQ
1.How can I place an order for LT1513CR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1513CR#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 LT1513CR#PBF reliable?
The price and inventory of LT1513CR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1513CR#PBF is usually 5 days.
3.What payment methods are accepted for LT1513CR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1513CR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1513CR#PBF?
LT1513CR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1513CR#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 LT1513CR#PBF?
For technical support, including LT1513CR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1513CR#PBF requirements.
6.How does Aetrix verify that LT1513CR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1513CR#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 LT1513CR#PBF meets industry standards.
7.What is the process for return or replacement of LT1513CR#PBF?
All LT1513CR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1513CR#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 LT1513CR#PBF part is unused and in its original packaging.
Return procedure for LT1513CR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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