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Analog Devices Inc. LT1510IN#PBF
- Part No.:
- LT1510IN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1510IN#PBF.pdf
- Description:
- IC BATT CHG MULTI-CHEM 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,969
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Product details
Overview
LT1510IN#PBF from Analog Devices (formerly Linear Technology) is a constant-voltage/constant-current switching battery charger IC for Li-ion, NiCd, and NiMH batteries. It integrates a 1.5A DC / 2A peak internal NPN switch, 0.1Ω onboard current-sense resistor, and 0.5% precision voltage reference. Designed for buck-mode charging across 2V–20V battery ranges, it delivers >87% efficiency at 1.3A and supports ground-referenced battery negative terminals in portable power systems.
For engineers reviewing the LT1510IN#PBF datasheet, LT1510IN#PBF pinout, LT1510IN#PBF application, or LT1510IN#PBF equivalent, key selection criteria include its 200kHz switching frequency, thermal resistance of 50°C/W in the 16-pin SO package, ±1% OVP accuracy over temperature, soft-start control via VC pin, and 3µA sleep-mode current when input is disconnected.
Technical Context
The LT1510IN#PBF implements current-mode PWM control with dual amplifiers: CA1 converts battery current through an internal 0.1Ω sense path into a proportional IPROG current (500µA/A), while CA2 compares IPROG against the PROG pin's 2.465V reference to regulate charging current. Its 200kHz oscillator drives a saturating NPN switch with BOOST-assisted gate drive for low on-resistance (0.3Ω typical).
Voltage regulation uses a dedicated 2.465V ±0.5% reference and voltage amplifier (VA) monitoring the OVP pin. When battery voltage reaches the programmed float level (e.g., 4.2V for Li-ion), VA reduces charging current to maintain constant voltage. Undervoltage lockout activates below 7V on VCC, and shutdown is achieved by pulling the VC pin below 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 200 kHz - enables compact 10 µH inductors and high efficiency (>87% at 1.3A) |
| Max Charging Current | 1.5 A DC - set by external RPROG with ±3% typical accuracy; thermally limited per input/battery voltage |
| Voltage Reference Accuracy | ±0.5% at 25°C - ensures Li-ion float voltage stability within ±21 mV of 4.2V target |
| Sleep-Mode Current | 3 µA - eliminates reverse battery drain when wall adapter is unplugged |
| Thermal Resistance θJA | 50°C/W - specified for 16-pin SO package; enables 1.5A operation up to 60°C ambient with TJ ≤ 125°C |
| Operating Temp Range | –40°C to +85°C - industrial-grade rating confirmed for LT1510IN variant |
| Input Voltage Range | 8V to 28V - requires ≥2V headroom over VBAT for VBAT <10V; ≥2.5V for VBAT >10V |
Pinout & Package
LT1510IN#PBF is supplied in a 16-pin plastic SO (S package) with fused lead thermal paddle. Four corner pins are internally fused to the die attach paddle for enhanced heat sinking; PCB land pattern must expand these pads for proper thermal performance (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 8, 16) | Power and signal ground reference | Four fused GND pins provide low-inductance return paths and thermal conduction to PCB copper |
| SW | Switch output node | Drives external Schottky catch diode; requires minimal trace length to GND to minimize EMI and voltage spikes |
| BOOST | Bootstrap supply for internal NPN switch | Supplies VCC + VBAT during switch ON; max 55V; critical for achieving 0.3Ω RON and high efficiency |
| SENSE | Current-sense amplifier input (low-side) | Connects to one end of internal 0.08Ω RS1; enables battery-terminal-independent current sensing |
| BAT | Current-sense amplifier input (high-side) | Connects to other end of RS1; allows direct connection to battery negative terminal without ground isolation |
| PROG | Charging current programming node | Accepts resistor or DAC sink current; 2.465V reference sets IPROG = 2000 × IBAT; 0.1µF capacitor provides loop compensation |
| VC | Inner-loop PWM control voltage | 0.7V threshold initiates soft-start; 1.1V enables full current; pulled low for shutdown; 0.1µF capacitor sets ramp rate |
| OVP | Voltage regulation feedback input | Compares battery voltage (via R3/R4 divider) against 2.465V reference; reduces current at float voltage |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5A switch + 0.1Ω sense resistor | Eliminates external MOSFET and discrete sense resistor; simplifies layout and reduces BOM count |
| Ground-referenced battery sensing | Allows BAT pin to tie directly to system ground-no isolated ground plane or level-shifting required |
| 200kHz fixed-frequency PWM | Enables use of small, low-profile surface-mount inductors (e.g., 10 µH ceramic) without audible noise |
| 0.5% voltage reference tolerance | Meets stringent Li-ion float voltage accuracy requirements (±21 mV at 4.2V) without trimming |
| 3 µA sleep-mode current | Prevents battery discharge when input is absent-critical for always-connected portable devices |
| Soft-start via VC pin capacitor | 0.1 µF capacitor yields ~3 ms current ramp; prevents inrush into large output capacitors or cold batteries |
Applications
| Smartphone Li-ion Charger | Industrial Handheld Battery Pack |
|---|---|
Use Scenario: Fast-charging single-cell 3.7V Li-ion battery in space-constrained smartphone design with wall adapter input. IC Role / Device Role / Timing Role: Primary constant-current/constant-voltage charger controller managing full 1.3A charge cycle and automatic transition to 4.2V float mode. Use Value: Achieves >87% efficiency at 1.3A using integrated switch and 0.1Ω sense, reducing thermal load and enabling compact 10 µH inductor placement. | Use Scenario: Rechargeable 7.2V NiMH battery pack for ruggedized industrial handheld scanner operating across –20°C to +60°C ambient. IC Role / Device Role / Timing Role: Dual-mode charger supporting both fast-charge (0.5A) and maintenance trickle-charge (50mA) with external termination logic. Use Value: Industrial temperature grade (–40°C to +85°C) and ±1% OVP accuracy ensure reliable charge termination and long-term battery health in variable environments. |
| Medical Portable Monitor | Emergency Lighting Backup System |
Use Scenario: Life-critical portable patient monitor requiring fail-safe Li-ion charging with zero reverse battery drain during AC loss. IC Role / Device Role / Timing Role: Battery management controller enforcing strict 4.2V float voltage and entering 3 µA sleep mode when input drops below 7V UVLO threshold. Use Value: 3 µA sleep current prevents battery depletion during extended AC outages-ensuring readiness for emergency use. | Use Scenario: LED-based emergency lighting with sealed 12V lead-acid or LiFePO₄ backup battery charged from 24V DC supply. IC Role / Device Role / Timing Role: Step-down switching charger regulating 1.5A bulk charge and transitioning to constant-voltage mode at battery-specific float voltage. Use Value: Wide 2V–20V battery range and programmable OVP allow support of multiple chemistries (Li-ion, NiMH, sealed Pb-acid) with single BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4000IGN#PBF | External N-channel MOSFET driver; no integrated switch; supports higher voltages (up to 32V input) | Requires external power stage; suited for >2A or multi-cell applications where flexibility outweighs integration | Select LTC4000IGN#PBF when designing for >1.5A charge current or need for programmable charge profiles beyond CC/CV |
| MAX1555ESA+ | USB-powered linear charger; 500mA max; no inductor; 0.5% reference; thermal regulation | Limited to low-power USB 5V input; no switching efficiency benefit; unsuitable for >1A or wide-input applications | Select MAX1555ESA+ only for ultra-low-cost, low-current (<500mA), USB-native designs where size and simplicity trump efficiency |
Compared with LTC4000IGN#PBF, LT1510IN#PBF offers lower system cost and smaller footprint via integrated switch but lacks multi-cell support. Compared with MAX1555ESA+, LT1510IN#PBF delivers 2.6× higher current and 20+ percentage points higher efficiency, making it suitable for mains-powered portable equipment demanding runtime and thermal performance.
Availability
LT1510IN#PBF is available at Aetrix Electronics and suitable for medical portable monitors, industrial handheld scanners, emergency lighting backup systems, and smartphone accessory chargers requiring stable component supply and long-term industrial-grade availability.
Supply support for LT1510IN#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 parts including the LT1510 series.
The LT1510 product line was designed specifically for highly integrated, efficient, and accurate single-chip switching battery chargers targeting portable and industrial equipment with Li-ion, NiCd, and NiMH batteries.
FAQ
What is the maximum continuous charging current supported by the LT1510IN#PBF?
The LT1510IN#PBF supports up to 1.5A DC charging current under thermally optimized conditions (e.g., 16-pin SO package with expanded GND pads on 2 oz copper). At 25°C ambient and 16V input charging an 8.4V battery, the datasheet confirms 1.5A with RPROG = 3.28kΩ. Derating applies above 60°C ambient due to θJA = 50°C/W and TJMAX = 125°C limits. Peak switch current is rated at 2A.
How does the LT1510IN#PBF achieve constant-voltage regulation for lithium-ion batteries?
The LT1510IN#PBF achieves constant-voltage regulation using its internal 2.465V ±0.5% reference and voltage amplifier (VA) connected to the OVP pin. A resistor divider (e.g., R3/R4) scales battery voltage to match this reference; when scaled voltage equals 2.465V, VA reduces charging current to maintain precise float voltage-enabling accurate 4.2V regulation for single-cell Li-ion without external op-amps.
Can the LT1510IN#PBF be used to charge batteries with negative terminals not referenced to system ground?
Yes-the LT1510IN#PBF supports true ground-referenced battery sensing: the SENSE and BAT pins connect across the internal 0.1Ω sense resistor, allowing the battery's negative terminal to tie directly to system ground. No high-side current sensing or isolated grounds are required, simplifying PCB layout and eliminating level-shift components in grounded-battery configurations.
What is the purpose of the BOOST pin on the LT1510IN#PBF, and what voltage can it tolerate?
The BOOST pin on the LT1510IN#PBF supplies gate drive for the internal NPN switch, enabling low saturation voltage (0.3Ω typical RON) and high efficiency. During switch ON, BOOST ≈ VCC + VBAT; it must be decoupled with a 0.22µF ceramic capacitor near the pin. Absolute maximum BOOST voltage is 55V with respect to GND, and BOOST-to-VCC differential must stay within –5V to +30V per datasheet ratings.
Does the LT1510IN#PBF require external components for safe lithium-ion charging, and if so, which ones are mandatory?
Yes-safe Li-ion charging with the LT1510IN#PBF requires three mandatory external components: (1) an input capacitor (≥10µF low-ESR tantalum or ceramic) for ripple handling, (2) an output capacitor (≥22µF tantalum) for filtering, and (3) an inductor (e.g., 10µH for 200kHz operation). A Schottky catch diode (e.g., MBRM120T3) is also required between SW and GND. No external termination circuitry is needed for Li-ion, unlike NiCd/NiMH.
LT1510IN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 1.5A
- Battery Pack Voltage:
- 20V (Max)
- Voltage - Supply (Max):
- 28V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
LT1510IN#PBF FAQ
1.How can I place an order for LT1510IN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1510IN#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 LT1510IN#PBF reliable?
The price and inventory of LT1510IN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1510IN#PBF is usually 5 days.
3.What payment methods are accepted for LT1510IN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1510IN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1510IN#PBF?
LT1510IN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1510IN#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 LT1510IN#PBF?
For technical support, including LT1510IN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1510IN#PBF requirements.
6.How does Aetrix verify that LT1510IN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1510IN#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 LT1510IN#PBF meets industry standards.
7.What is the process for return or replacement of LT1510IN#PBF?
All LT1510IN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1510IN#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 LT1510IN#PBF part is unused and in its original packaging.
Return procedure for LT1510IN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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