LINEAR TECHNOLOGY - LTC4101 Data Sheet
Summary
This single-chip smart controller provides an advanced, highly efficient solution for managing battery charging up to 4A. Designed for builders of portable instruments, data storage systems, and backup servers, it simplifies complex power management through comprehensive SMBus compliance and continuous SafetySignal monitoring. The manual details its comprehensive electrical specifications, programmability features (voltage/current limits), and operational guidelines, ensuring optimal performance and system reliability in demanding embedded applications.
Page 1 Text Content
LTC4101 Smart Battery
Charger Controller FEATURES DESCRIPTIO
Single Chip Smart Battery Charger Controller The LTC®4101 Smart Battery Charger is a single chip
100% Compliant (Rev. 1.1) SMBus Support Allows charging solution that dramatically simplifies construc- for Operation with or without Host tion of an SBS compliant system. The LTC4101 imple-
Up to 4A Charging Current Capability ments a Level 2 charger function whereby the charger can
High Efficiency Synchronous Buck Charger be programmed by the battery or by the host. A Safety Signal VBAT Optimized 3V to 5.5V on the battery being charged is monitored for tempera- SMBus Accelerator Improves SMBus Timing ture, connectivity and battery type information. The SMBus Hardware Interrupt and SMBAlert Response interface remains alive when the AC power adapter is Eliminate Interrupt Polling removed and responds to all SMBus activity directed to 0.5V Dropout Voltage; Maximum Duty Cycle > 98% it, including Safety Signal status (via the Charger Status AC Adapter Current Limit Maximizes Charge Rate command). The charger also provides an interrupt to the ±0.8% Voltage Accuracy; ±4% Current Accuracy host whenever a status change is detected (e.g., battery 10-Bit DAC for Charge Current Programming removal, AC adapter connection).
11-Bit DAC for Charger Voltage Programming
Charging current and voltage are restricted to chemistry-
User-Selectable Overvoltage and Overcurrent Limits
specific limits for improved system safety and reliability.
High Noise Immunity Safety Signal Sensor
Limits are programmable by two external resistors. Addi-
Available in a 24-Pin SSOP Package
tionally, the maximum average current from the AC adapter APPLICATIO is programmable to avoid overloading the adapter when simultaneously supplying load current and charging
Portable Instruments and Computers
current. When supplying system load current, charging
Data Storage Systems and Battery Backup Servers
current is automatically reduced to prevent adapter
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All
overload.
other trademarks are the property of their respective owners. Protected by U.S. Patents including 6650174, 5723970.
TYPICAL APPLICATIO DCIN 9V to 12V, 2A 0.1µF
6.04k VBAT PART
3V 1.21k < 5.5V LTC4101
TO 5.5V
> 5.5V LTC4100
LTC4101 0.1µF 0.05Ω
VDD DCIN
DCDIV INFET 5k
CHGEN CHGEN CLP SYSTEM LOAD
ACP ACP CLN 5µF SMART BATTERY
SMBALERT TGATE
SCL BGATE
SDA PGND 5µF
THB CSP THA BAT ILIM VSET
VLIM ITH 0.03µF IDC GND 6.04k10k
SMBALERT# Safety Signal
SMBCLK SMBCLK SMBDAT SMBDAT 4101 F01a
Figure 1. 1A Smart Battery Charger
Page Summary Contents For LINEAR TECHNOLOGY - LTC4101 Data Sheet
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 291.74 KB |
| Published | July 15, 2026 |
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Frequently Asked Questions
What protection features does the LTC4101 offer?
It provides user-selectable overvoltage/overcurrent limits, a SafetySignal sensor, and automatically reduces current when simultaneously supplying load power.
How reliable is its communication with a host system?
The device supports 100% compliant SMBus, utilizing an Accelerator function and maintaining status awareness via hardware interrupts even if the AC adapter disconnects.
Can I precisely set the output charging parameters?
Yes, it features a 10-Bit DAC for precise charge current programming and an 11-Bit DAC for charger voltage programming.