Analog Devices Inc. LT1510IS#TRPBF

Overview

LT1510IS#TRPBF from Analog Devices (formerly Linear Technology) is a constant-voltage/constant-current step-down battery charger IC designed for lithium-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. It operates from 8V to 28V input, supports 2V–20V battery ranges, and delivers >87% efficiency at 1.3A in Li-ion charging applications.

For engineers reviewing the LT1510IS#TRPBF datasheet, LT1510IS#TRPBF pinout, LT1510IS#TRPBF application, or LT1510IS#TRPBF equivalent, key selection criteria include its 200kHz switching frequency, thermal resistance of 50°C/W in the 16-pin SO package, ±1% OVP reference accuracy over temperature, soft-start via VC pin capacitor, and shutdown control through the VC pin.

Technical Context

The LT1510IS#TRPBF implements current-mode PWM control with dual amplifiers: CA1 converts battery current across 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. The 200kHz oscillator drives a saturating NPN switch with BOOST-assisted gate drive for low conduction loss.

Voltage regulation uses a dedicated 2.465V bandgap reference feeding amplifier VA, which monitors battery voltage via the OVP pin to transition from constant-current to constant-voltage mode. Undervoltage lockout activates below 7V on VCC, and reverse battery drain is limited to 3µA when input is disconnected.

Key Specifications

Pinout & Package

The LT1510IS#TRPBF is housed in a 16-lead plastic SO package (S package) with four corner pins fused to the die attach paddle for thermal sinking. PCB land pattern must expand these pins for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery charger IC applications.

Compared with LTC4002 and TPS65023, the LT1510IS#TRPBF offers the lowest component count for standalone CC/CV charging, highest integration of sense and switch, and best thermal performance in its SO-16 package-making it optimal for cost-sensitive, thermally constrained single-battery applications.

Availability

LT1510IS#TRPBF is available at Aetrix Electronics and suitable for smartphone battery chargers, industrial portable tool packs, medical portable monitor backups, and NiMH cordless phone bases requiring stable component supply and long-term lifecycle support.

Supply support for LT1510IS#TRPBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LT1510IS#TRPBF belongs to ADI's legacy Linear Technology battery management portfolio, engineered specifically for high-efficiency, low-component-count, single-chip CC/CV charging of Li-ion, NiCd, and NiMH batteries in portable and industrial equipment.

FAQ

What is the maximum continuous charging current supported by the LT1510IS#TRPBF?

The LT1510IS#TRPBF supports up to 1.5 A DC charging current under thermally optimized conditions: PCB with expanded GND lands on all four fused corner pins, ambient temperature ≤60°C, and θ_JA = 50°C/W. At higher ambient temperatures or reduced copper area, derating applies-e.g., 1.3 A at 70°C ambient per Figure G13 in the datasheet. Peak switch current capability remains 2 A for short transients.

How does the LT1510IS#TRPBF achieve constant-voltage regulation for lithium-ion batteries?

The LT1510IS#TRPBF achieves constant-voltage regulation using its internal 2.465 V ±0.5% reference voltage applied to amplifier VA. The OVP pin senses battery voltage via a resistor divider (e.g., R3/R4); when the divided voltage reaches 2.465 V, VA reduces the charging current to maintain precise float voltage-enabling full Li-ion charging without external termination circuitry. This mechanism is confirmed in Figure 2 and Applications section.

Can the LT1510IS#TRPBF be used to charge nickel-metal-hydride (NiMH) batteries?

Yes, the LT1510IS#TRPBF can charge NiMH batteries, as explicitly stated in the "TYPICAL APPLICATIONS" and "FEATURES" sections. It supports constant-current charging profiles and uses the OVP pin for overvoltage protection. However, NiMH requires external charge termination circuitry (e.g., dV/dt or temperature sensing), unlike Li-ion-so the LT1510IS#TRPBF provides only the regulated current source, not full algorithmic termination.

What is the purpose of the BOOST pin on the LT1510IS#TRPBF, and what voltage can it tolerate?

The BOOST pin on the LT1510IS#TRPBF supplies bootstrapped drive voltage to the internal NPN switch, reducing saturation voltage and conduction loss. During switch ON, V_BOOST ≈ V_CC + V_BAT, and the absolute maximum rating is 55 V with respect to GND. Exceeding this risks permanent damage. The pin also sinks 6–14 mA during switch conduction, requiring appropriate external decoupling if driving high-V_BAT systems.

Does the LT1510IS#TRPBF require an external blocking diode between the IC and battery?

No, the LT1510IS#TRPBF does not require an external blocking diode. When the input adapter is unplugged, the IC enters sleep mode and draws only 3 µA from the battery-eliminating reverse current concerns. This is verified in the "FEATURES" list ("Low Reverse Battery Drain Current: 3µA") and Figure 1 note ("NO TERMINATION REQUIRED"). Adding a diode would introduce unnecessary forward drop and reduce efficiency.