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Analog Devices Inc. LT1513-2CT7#PBF
- Part No.:
- LT1513-2CT7#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LT1513-2CT7#PBF.pdf
- Description:
- IC BAT CHG MULT-CHEM 1CL TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,707
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Product details
Overview
LT1513-2CT7#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 precise external current programming, supports input voltages lower than battery voltage, and maintains 1% voltage accuracy for lithium-ion cells.
For engineers reviewing the LT1513-2CT7#PBF datasheet, LT1513-2CT7#PBF pinout, LT1513-2CT7#PBF application, or LT1513-2CT7#PBF equivalent, key selection considerations include ground-referenced current sensing, 0mV IFB regulation for analog/PWM current control, TO-220-7 thermal performance (θJA = 50°C/W), and compatibility with single- or multi-cell Li-ion, NiMH, and lead-acid batteries.
Technical Context
The LT1513-2CT7#PBF implements dual-loop current-mode control: voltage regulation via FB pin referenced to 1.245V internal bandgap, and current regulation via IFB pin held at 0mV (vs –100mV on LT1513). Its error amplifier has two inverting inputs-one for voltage feedback, one for current feedback-enabling seamless constant-current/constant-voltage transition without external op-amps.
It integrates a 500kHz oscillator, adaptive antisaturation driver, 40V switch breakdown rating, and a VC pin that serves as both compensation node and current-limit control point (0–3.6A range over 1–1.9V). The S/S pin provides logic-compatible shutdown and 600–800kHz synchronization, while the TO-220-7 package enables direct heatsinking via the electrically grounded tab.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz typical; minimizes inductor size and EMI filter requirements in SEPIC/flyback chargers. |
| FB Reference Voltage | 1.245V ±12mV; sets precise float voltage for Li-ion (e.g., 4.2V/cell) via R1/R2 divider. |
| IFB Regulation Voltage | 0mV (LT1513-2 variant); enables ground-referenced current programming with external DAC or PWM. |
| Max Switch Current | 3.0–5.4A depending on duty cycle; supports ≥2A battery charge current with margin. |
| Supply Current | 4–5.5mA operating; ensures low quiescent power in always-on battery systems. |
| Shutdown Current | 12–30µA; preserves battery life during standby with minimal self-discharge. |
| Input Voltage Range | 2.4–25V; allows operation from USB, wall adapters, or automotive sources even below battery voltage. |
| Switch ON Resistance | 0.25–0.45Ω; reduces conduction loss and thermal stress in high-current charging stages. |
Pinout & Package
The LT1513-2CT7#PBF uses a 7-lead TO-220 package (T7) with electrically grounded metal tab for thermal management and low-inductance grounding. Pin 4 (GND) and the TAB share the same electrical node and must be connected to a common low-impedance ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Error amplifier output / current limit control | Drives current comparator threshold; 1–1.9V range sets 0–3.6A switch current; used for loop compensation with RC network to GND. |
| FB (Pin 2) | Voltage feedback input | Inverting input of voltage error amp; referenced to 1.245V internal bandgap; bias current ≤550nA requires ≥100µA divider current for accuracy. |
| IFB (Pin 3) | Current feedback input | Regulates at 0mV for LT1513-2; accepts external current-programming signal; input resistance ≈5kΩ; requires R4/C4 filtering per Figure 1. |
| GND (Pin 4) | Power and signal ground | Common return for control circuitry, switch current, and TAB; all Kelvin connections (VC, FB, S/S) must tie directly here. |
| VSW (Pin 5) | Switch collector output | Carries up to 3A pulsed current; fast edges require short PCB traces to minimize ringing and EMI. |
| S/S (Pin 6) | Shutdown/synchronization | Logic-compatible input: <0.6V = shutdown (12µA IQ); 600–800kHz AC signal = frequency sync; floating = enabled. |
| VIN (Pin 7) | Input supply | Accepts 2.4–25V; requires local low-ESR capacitor (e.g., 22µF tantalum) tied directly to GND pin and TAB. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-referenced current sense | IFB = 0mV enables direct connection of R3 current-sense resistor to system ground-no floating sense amps or isolated supplies needed. |
| Programmable charging current | Linear ICHARGE control from 0A to >2A using DC voltage or PWM applied to R5/R4 network (Figure 5), with ±62mA linearity error over full range. |
| SEPIC topology support | Allows charging when VIN < VBAT, eliminates battery discharge path when off, and avoids snubber losses inherent in flyback designs. |
| Integrated 500kHz oscillator | Reduces external timing components; stable over –40°C to 125°C; synchronizable to external 600–800kHz clock for EMI reduction. |
| Thermally optimized TO-220-7 | θJA = 50°C/W with standard mounting; grounded TAB enables direct heatsink attachment and lowers junction-to-case thermal resistance to 4°C/W. |
Applications
| Lithium-Ion Portable Power | Industrial Backup Battery Charger |
|---|---|
Use Scenario: Charging single- or dual-cell Li-ion packs (4.2V or 8.4V) in handheld medical devices powered by 5–12V USB or adapter inputs. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger IC managing full CC/CV profile with 1% voltage accuracy and programmable 0.1–2A charge current. Use Value: Enables compact, thermally efficient charging without external current-sense amplifiers or isolated feedback, reducing BOM count and layout complexity. | Use Scenario: Maintaining sealed lead-acid or LiFePO4 backup batteries in industrial PLCs or remote sensors with wide-input 9–24V DC supplies. IC Role / Device Role / Timing Role: Programmable-current battery maintainer supporting CV mode at 13.8V or 14.4V and CC mode up to 1.5A, with shutdown during mains loss. Use Value: Delivers reliable, low-maintenance charging across variable input conditions-including brownouts-while minimizing standby current drain (<30µA). |
| NiMH Cordless Tool Pack Charger | CCFL Backlight Driver |
Use Scenario: Fast-charging 10-cell NiMH packs (12V nominal) in professional cordless power tools using 19V laptop-style adapters. IC Role / Device Role / Timing Role: High-efficiency SEPIC charger delivering 1.2A CC current and terminating at 1.45V/cell with temperature-compensated voltage foldback. Use Value: Supports aggressive charge rates without thermal runaway risk, leveraging ground-referenced current sensing for accurate delta-V termination. | Use Scenario: Driving cold-cathode fluorescent lamps in legacy industrial displays or test equipment requiring high-voltage AC output. IC Role / Device Role / Timing Role: High-efficiency Royer converter controller operating in floating or grounded mode with regulated lamp current and soft-start. Use Value: Eliminates need for discrete gate drivers and high-side current sensing, simplifying transformer drive and improving lamp lifetime consistency. |
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 | External MOSFET controller (no integrated switch); supports higher voltages (up to 32V VIN); requires external sense resistor and op-amp for current programming. | Used in high-power (>3A), multi-chemistry chargers where thermal management demands discrete FETs. | Select LTC4000-1 only when >3A charge current, >25V input, or multi-battery stack configurations are required. |
| MAX1771 | Fixed 300kHz frequency; no IFB pin-current sense is resistor-to-ground with 100mV threshold; no 0mV programmability; smaller SO-8 package. | Targeted at cost-sensitive, lower-accuracy NiCd/NiMH chargers where precision Li-ion CV is not required. | Choose MAX1771 only for simple, fixed-current applications with tight board space constraints and relaxed voltage accuracy (±3%). |
Compared with LTC4000-1 and MAX1771, the LT1513-2CT7#PBF uniquely combines an integrated 3A switch, 0mV IFB programmability, and SEPIC topology support in a thermally robust TO-220 package-making it optimal for mid-power, precision Li-ion charging where layout simplicity and ground-referenced sensing are critical.
Availability
LT1513-2CT7#PBF is available at Aetrix Electronics and suitable for lithium-ion portable power, industrial backup battery systems, NiMH cordless tool chargers, and CCFL backlight drivers requiring stable component supply and long-term manufacturability.
Supply support for LT1513-2CT7#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.
The LT1513 family was designed specifically for high-accuracy, topology-flexible battery charging-emphasizing ground-referenced current sensing, wide input range, and seamless CC/CV transition for rechargeable chemistries including Li-ion, NiMH, and lead-acid.
FAQ
What is the key functional difference between LT1513-2CT7#PBF and the standard LT1513?
The LT1513-2CT7#PBF features a 0mV current-sense reference at the IFB pin, enabling direct ground-referenced current programming via external DAC or PWM. In contrast, the standard LT1513 regulates IFB at –100mV and requires a floating sense resistor. This makes the LT1513-2CT7#PBF ideal for systems needing precise, externally controlled charge current without isolation components. The LT1513-2CT7#PBF also removes internal IFB feedback resistors to expose the amplifier for custom loop compensation.
Can LT1513-2CT7#PBF charge batteries with input voltage lower than battery voltage?
Yes. The LT1513-2CT7#PBF supports SEPIC and flyback topologies, both of which allow charging when input voltage is below, equal to, or above battery voltage. This is achieved through magnetic energy storage in coupled inductors (L1A/L1B), enabling bidirectional power transfer. The LT1513-2CT7#PBF's 2.4V minimum input and 40V switch rating make it suitable for 3.3V–24V inputs charging 4.2V–20V battery stacks.
What thermal design guidance applies to LT1513-2CT7#PBF in TO-220-7 package?
The LT1513-2CT7#PBF has θJA = 50°C/W and θJC = 4°C/W. For reliable operation at full 2A charge current, solder the TAB directly to ≥1 in² copper area on the PCB ground plane and add an external heatsink if ambient exceeds 60°C. Avoid thermal vias under the TAB-use solid copper pour instead. Layout Figure 4 in the datasheet shows recommended grounding and decoupling paths to minimize thermal resistance and noise coupling.
How does LT1513-2CT7#PBF handle constant-current to constant-voltage transition?
The LT1513-2CT7#PBF uses dual-loop current-mode control: the IFB pin regulates charging current until battery voltage reaches the FB-set threshold (e.g., 4.2V), then the FB loop takes over to hold voltage constant. The crossover is sharp due to low IFB input current (<10nA) and high transconductance error amplifier (1500µmho). No external circuitry is needed-the LT1513-2CT7#PBF automatically transitions and maintains 1% CV accuracy throughout.
Is LT1513-2CT7#PBF compatible with lead-acid battery charging profiles?
Yes. The LT1513-2CT7#PBF supports lead-acid charging by configuring the FB divider for 13.8V or 14.4V float voltage and setting appropriate current limits via the IFB network. Its wide input range (2.4–25V), programmable current, and thermal robustness suit 12V SLA backup systems. Use R1/R2 values per Equation 1 in the datasheet to set exact voltage thresholds, and ensure diode D1 has low leakage (<5µA) to prevent battery drain during standby.
LT1513-2CT7#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-7 Formed Leads
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LT1513-2CT7#PBF FAQ
1.How can I place an order for LT1513-2CT7#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1513-2CT7#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 LT1513-2CT7#PBF reliable?
The price and inventory of LT1513-2CT7#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1513-2CT7#PBF is usually 5 days.
3.What payment methods are accepted for LT1513-2CT7#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1513-2CT7#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1513-2CT7#PBF?
LT1513-2CT7#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1513-2CT7#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 LT1513-2CT7#PBF?
For technical support, including LT1513-2CT7#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1513-2CT7#PBF requirements.
6.How does Aetrix verify that LT1513-2CT7#PBF is sourced from the original manufacturer or authorized distributors?
All LT1513-2CT7#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 LT1513-2CT7#PBF meets industry standards.
7.What is the process for return or replacement of LT1513-2CT7#PBF?
All LT1513-2CT7#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1513-2CT7#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 LT1513-2CT7#PBF part is unused and in its original packaging.
Return procedure for LT1513-2CT7#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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