Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Analog Devices Inc. LT1571EGN-1#TRPBF

Name: LT1571EGN-1#TRPBF
Brand: Analog Devices Inc.
SKU: LT1571EGN-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LT1571EGN-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Battery Chargers

Package:: 28-SSOP (0.154", 3.90mm Width)

Datasheet:: LT1571EGN-1#TRPBF.pdf

Description:: IC BATT CHG MULTI-CHEM 28SSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,708

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LT1571EGN-1#TRPBF from Analog Devices (formerly Linear Technology) is a constant-current/constant-voltage PWM battery charger IC for Li-Ion, NiMH, and NiCd batteries. It delivers up to 1.5A DC charge current with 200kHz switching, features an internal 0.1Ω sense resistor for ±5% current accuracy, supports 4.1V/4.2V or 8.2V/8.4V preset battery voltages, and provides a FLAG output signaling charge completion at 20% of programmed current. It is used in compact cradle chargers for portable electronics.

For engineers reviewing the LT1571EGN-1#TRPBF datasheet, LT1571EGN-1#TRPBF pinout, LT1571EGN-1#TRPBF application, or LT1571EGN-1#TRPBF equivalent, key selection criteria include its 200kHz fixed-frequency buck architecture, GN (28-pin narrow SSOP) package with fused ground paddle, 1.5A max DC output, 0.6% reference voltage accuracy, and integrated termination flag functionality - all critical for space-constrained, thermally managed battery charging designs.

Technical Context

The LT1571EGN-1#TRPBF implements a current-mode PWM step-down (buck) topology with internal NPN power switch and bootstrap-driven gate control via BOOST pin. Its dual-loop control uses CA1 for precise current sensing (500µA/A transconductance) and VA amplifier with 2.465V reference for voltage regulation during CV phase.

It operates across 8V–26V input and supports battery voltages from 1V to 20V. The device integrates undervoltage lockout (7V typ), thermal shutdown (T_J = 125°C), and low reverse battery drain (5µA), enabling robust operation in adapter-powered portable charging systems without external supervision.

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	200 kHz - enables compact magnetics and EMI filtering while balancing efficiency and size in handheld charger designs.
Max DC Charge Current	1.5 A - sufficient for fast-charging single- or dual-cell Li-Ion packs in PDAs and cellular handsets.
Reference Voltage Accuracy	±0.6% at 25°C - ensures battery float voltage stays within ±50 mV of target (e.g., 4.2 V ±25 mV), meeting Li-Ion safety requirements.
Charge Current Accuracy	±5% - achieved using internal 0.1 Ω sense resistor and PROG pin programming, reducing BOM count and calibration effort.
FLAG Threshold	20% of programmed current - provides reliable end-of-charge detection for timer-based termination in Li-Ion applications.
Thermal Resistance θ_JA	40°C/W - requires PCB ground plane heat spreading via four fused corner GND pins to sustain full 1.5A load at 85°C ambient.
Supply Voltage Range	8 V to 26 V - accommodates standard wall adapters (e.g., 12 V, 15 V, 19 V) while maintaining ≥2 V headroom over battery voltage.

Pinout & Package

LT1571EGN-1#TRPBF is housed in a 28-pin narrow plastic SSOP (GN package) with fused ground paddle for thermal management. Four corner GND pins are internally connected to the die attach paddle and must be soldered to expanded PCB copper lands for effective heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
SW	NPN power switch emitter	Connects directly to Schottky catch diode cathode; requires minimal trace length to GND to minimize switching losses and EMI.
BOOST	Bootstrap drive node	Supplies V_CC + V_BAT to saturate NPN switch; reduces on-resistance and conduction loss during high-current charging.
SENSE / BAT	Current sense differential inputs	Measures voltage drop across internal 0.1 Ω resistor; SENSE connects to battery negative, BAT to battery positive for Kelvin sensing.
PROG	Charge current programming input	Sinks 500 µA per amp of battery current; sets I_BAT = (2.465 V × 2000) / R_PROG; also used for loop compensation.
VC	Inner-loop PWM control	Controls duty cycle in current mode; 0.9 V threshold starts switching; pulled below 0.6 V for shutdown; 0.1 µF capacitor enables soft-start.
FLAG	Open-collector charge completion indicator	Drives low when I_BAT ≤ 20% of programmed value; requires external pull-up for microcontroller interrupt or timer start.
VFB	Adjustable voltage feedback input	Accepts resistor divider for custom battery voltage setting (e.g., 4.1 V, 8.2 V); not used in LT1571-2/-5 variants.
GND (Pins 1,2,3,4,25,26,27,28)	Power and signal ground	All eight GND pins fused to internal paddle; must connect to large thermal pad on PCB to maintain θ_JA = 40°C/W.

Key Features

Feature	Design Value
Integrated current sense resistor	0.1 Ω metal-film resistor eliminates external sense component, reduces layout sensitivity, and maintains ±5% charge current accuracy without trimming.
Preset voltage selection logic	Supports 4.1 V / 4.2 V or 8.2 V / 8.4 V via SELECT pin (open/ground), enabling single-BOM flexibility for multi-cell Li-Ion configurations.
Low reverse battery drain	5 µA typical sleep current when adapter is removed - preserves battery capacity during storage or standby in portable devices.
Programmable charge termination threshold	Default 20% flag trigger adjustable down to 7.5% via RCAP resistor on CAP pin, allowing fine-tuned termination for sensitive chemistries.
Thermally enhanced SSOP package	28-pin GN package with fused GND paddle and 40°C/W θ_JA - sustains 1.5 A continuous charging at 85°C ambient with proper PCB copper area.

Applications

Cellular Phone Cradle Charger	Tablet Battery Management System
Use Scenario: Wall-powered desktop cradle charging single-cell Li-Ion batteries (3.7 V nominal, 4.2 V max) in smartphones. IC Role / Device Role / Timing Role: Primary constant-current/constant-voltage buck charger controller with integrated current sensing, voltage regulation, and end-of-charge flag generation. Use Value: Enables compact, low-component-count design with <87% efficiency at 1 A, 5 µA reverse drain, and automatic transition from CC to CV phase without external supervision.	Use Scenario: Integrated charging subsystem for dual-cell (8.4 V) Li-Ion tablet batteries using 12 V or 15 V adapter input. IC Role / Device Role / Timing Role: High-efficiency 200 kHz buck charger delivering up to 1.5 A with precision 0.6% reference and selectable 8.2 V / 8.4 V termination. Use Value: Supports fast charging with thermal derating handled via fused-GND SSOP package; FLAG output synchronizes firmware-controlled timeout and safety cutoff.
NiMH/NiCd Portable Instrument Charger	Industrial Handheld Terminal Power Supply
Use Scenario: Multi-chemistry charger for ruggedized test equipment using interchangeable NiMH (1.2 V/cell) or NiCd (1.2 V/cell) packs. IC Role / Device Role / Timing Role: Programmable CC/CV charger supporting wide battery voltage range (1 V–20 V) and adaptive termination via VC pin control and FLAG assertion. Use Value: Eliminates need for separate chemistries-specific ICs; ±5% current accuracy and 200 kHz frequency ensure consistent charge profiles across varying pack configurations.	Use Scenario: Embedded battery backup and charging in warehouse barcode scanners operating in temperature-variable industrial environments. IC Role / Device Role / Timing Role: Robust charger IC with –40°C to 85°C operating range, undervoltage lockout (7 V), and low shutdown current (150 µA) for extended field uptime. Use Value: Maintains reliable charging under brownout conditions and minimizes self-discharge during long idle periods, extending operational readiness between charges.

Cellular Phone Cradle Charger

Tablet Battery Management System

Use Scenario: Wall-powered desktop cradle charging single-cell Li-Ion batteries (3.7 V nominal, 4.2 V max) in smartphones.

IC Role / Device Role / Timing Role: Primary constant-current/constant-voltage buck charger controller with integrated current sensing, voltage regulation, and end-of-charge flag generation.

Use Value: Enables compact, low-component-count design with <87% efficiency at 1 A, 5 µA reverse drain, and automatic transition from CC to CV phase without external supervision.

Use Scenario: Integrated charging subsystem for dual-cell (8.4 V) Li-Ion tablet batteries using 12 V or 15 V adapter input.

IC Role / Device Role / Timing Role: High-efficiency 200 kHz buck charger delivering up to 1.5 A with precision 0.6% reference and selectable 8.2 V / 8.4 V termination.

Use Value: Supports fast charging with thermal derating handled via fused-GND SSOP package; FLAG output synchronizes firmware-controlled timeout and safety cutoff.

NiMH/NiCd Portable Instrument Charger

Industrial Handheld Terminal Power Supply

Use Scenario: Multi-chemistry charger for ruggedized test equipment using interchangeable NiMH (1.2 V/cell) or NiCd (1.2 V/cell) packs.

IC Role / Device Role / Timing Role: Programmable CC/CV charger supporting wide battery voltage range (1 V–20 V) and adaptive termination via VC pin control and FLAG assertion.

Use Value: Eliminates need for separate chemistries-specific ICs; ±5% current accuracy and 200 kHz frequency ensure consistent charge profiles across varying pack configurations.

Use Scenario: Embedded battery backup and charging in warehouse barcode scanners operating in temperature-variable industrial environments.

IC Role / Device Role / Timing Role: Robust charger IC with –40°C to 85°C operating range, undervoltage lockout (7 V), and low shutdown current (150 µA) for extended field uptime.

Use Value: Maintains reliable charging under brownout conditions and minimizes self-discharge during long idle periods, extending operational readiness between charges.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC4000IGN#PBF	Wider input range (4.5 V–36 V), supports external MOSFETs, higher accuracy (±0.5% ref), but requires more external components and lacks integrated sense resistor.	Used in high-power, multi-cell, or programmable-chemistry systems where flexibility outweighs BOM simplicity.	Select LTC4000IGN#PBF when designing for >20 V battery stacks or requiring independent current/voltage loop tuning.
BQ24725ARHRT	500 kHz synchronous buck, supports SMBus interface, 12-bit ADC monitoring, but no integrated sense resistor and requires external current sense.	Targeted at server/industrial systems needing telemetry, fault logging, and host-controlled charging profiles.	Choose BQ24725ARHRT only if SMBus communication, real-time telemetry, or multi-phase synchronization is required.

Compared with LTC4000IGN#PBF and BQ24725ARHRT, LT1571EGN-1#TRPBF offers lowest component count and fastest time-to-prototype for fixed-frequency, single-FET Li-Ion/NiMH cradle chargers - trading programmability for integration, thermal simplicity, and cost efficiency in volume consumer applications.

Availability

LT1571EGN-1#TRPBF is available at Aetrix Electronics and suitable for cellular phone cradle chargers, tablet battery management systems, portable instrument chargers, and industrial handheld terminal power supplies requiring stable component supply and long-term production continuity.

Supply support for LT1571EGN-1#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) acquired Linear Technology in 2017 and maintains full technical and manufacturing support for the LT product line, including precision analog, power management, and battery charging ICs.

The LT1571EGN-1#TRPBF belongs to Linear's legacy high-efficiency battery charger IC family, designed specifically for compact, thermally constrained, adapter-powered portable electronics requiring simple, reliable, and accurate CC/CV charging without microcontroller dependency.

FAQ

What is the maximum continuous battery charge current supported by LT1571EGN-1#TRPBF?

The LT1571EGN-1#TRPBF supports up to 1.5 A DC battery charge current under thermal-limited conditions. This is verified in the Electrical Characteristics table for R_PROG = 3.28 kΩ at T_J < 0°C. At elevated temperatures or with insufficient PCB copper, derating applies - e.g., 1.2 A max with 16-pin SSOP (θ_JA = 75°C/W), but LT1571EGN-1#TRPBF's 28-pin GN package enables full 1.5 A with proper heatsinking.

Does LT1571EGN-1#TRPBF require an external current sense resistor?

No, LT1571EGN-1#TRPBF integrates a precision 0.1 Ω current sense resistor between SENSE and BAT pins. External R_PROG on the PROG pin sets charge current magnitude (I_BAT = 2.465 V × 2000 / R_PROG), eliminating the need for discrete sense resistors and associated layout sensitivity. This is confirmed in the Features section and Figure 1 schematic.

How does the FLAG output of LT1571EGN-1#TRPBF indicate charge completion?

The FLAG pin on LT1571EGN-1#TRPBF is an open-collector output that pulls low when the battery charge current drops to ≤20% of the programmed value - indicating entry into constant-voltage taper phase. It requires an external pull-up resistor and can sink ≥1 mA. This behavior is documented in the Electrical Characteristics table (Charge Completion Flag) and Applications Information section on Lithium-Ion Charge Completion.

Can LT1571EGN-1#TRPBF be used for NiMH or NiCd battery charging?

Yes, LT1571EGN-1#TRPBF supports NiMH and NiCd charging across 1 V–20 V battery voltage range. It provides constant-current regulation and optional overvoltage protection via the VA amplifier. Unlike Li-Ion, NiMH/NiCd require different termination methods (e.g., –dV/dt or temperature sensing), so FLAG is not used for final cutoff but remains functional for current monitoring. This is explicitly stated in the Features and Applications sections.

What is the purpose of the BOOST pin on LT1571EGN-1#TRPBF?

BOOST pin on LT1571EGN-1#TRPBF supplies gate drive voltage to the internal NPN power switch, enabling saturation and minimizing on-resistance (0.3 Ω typ). It is internally connected to V_CC + V_BAT during switch ON, reducing conduction loss and improving efficiency - especially critical at high charge currents. This function is detailed in the Pin Functions section and Block Diagram.

LT1571EGN-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 28-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Battery Chemistry:: Multi-Chemistry

Number of Cells:: -

Current - Charging:: Constant - Programmable

Programmable Features:: -

Fault Protection:: -

Charge Current - Max:: 1.5A

Battery Pack Voltage:: -

Voltage - Supply (Max):: 26V

Interface:: -

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SSOP

LT1571EGN-1#TRPBF FAQ

1.How can I place an order for LT1571EGN-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LT1571EGN-1#TRPBF 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 LT1571EGN-1#TRPBF reliable?

The price and inventory of LT1571EGN-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1571EGN-1#TRPBF is usually 5 days.

3.What payment methods are accepted for LT1571EGN-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1571EGN-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LT1571EGN-1#TRPBF?

LT1571EGN-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LT1571EGN-1#TRPBF 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 LT1571EGN-1#TRPBF?

For technical support, including LT1571EGN-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1571EGN-1#TRPBF requirements.

6.How does Aetrix verify that LT1571EGN-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LT1571EGN-1#TRPBF 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 LT1571EGN-1#TRPBF meets industry standards.

7.What is the process for return or replacement of LT1571EGN-1#TRPBF?

All LT1571EGN-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1571EGN-1#TRPBF, 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 LT1571EGN-1#TRPBF part is unused and in its original packaging.

Return procedure for LT1571EGN-1#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…