LINEAR TECHNOLOGY LTC4100 User's Manual
Summary
This single-chip smart battery charger controller simplifies complex charging solution design for robust, SBS-compliant systems. The module features highly efficient operation (>98%) and supports essential functions like advanced temperature monitoring via SafetySignal and comprehensive AC adapter current limiting. Designed for use in portable instruments, data storage solutions, and backup servers, it provides precise control over voltage (3.5V to 26V), charging current, and critical parameters, ensuring reliable power management while simplifying system construction.
Page 1 Text Content
LTC4100 Smart Battery
Charger Controller FEATURES DESCRIPTIO
Single Chip Smart Battery Charger Controller The LTC®4100 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 LTC4100 imple-
SMBus Accelerator Improves SMBus Timing ments a Level 2 charger function whereby the charger can
Wide Output Voltage Range: 3.5V to 26V be programmed by the battery or by the host. A Safety Signal Hardware Interrupt and SMBAlert Response on the battery being charged is monitored for tempera- Eliminate Interrupt Polling ture, connectivity and battery type information. The SMBus High Efficiency Synchronous Buck Charger interface remains alive when the AC power adapter is 0.5V Dropout Voltage; Maximum Duty Cycle > 98% removed and responds to all SMBus activity directed to AC Adapter Current Limit Maximizes Charge Rate it, including Safety Signal status (via the Charger Status ±0.8% Voltage Accuracy; ±4% Current Accuracy command). The charger also provides an interrupt to the Up to 4A Charging Current Capability 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 and 5723970.
TYPICAL APPLICATIO DCIN
TO 5.5V
LTC4100 0.1µF 0.033Ω
VDD DCIN
DCDIV INFET 5k
CHGEN CHGEN CLP SYSTEM LOAD
ACP ACP CLN 20µF SMART BATTERY
SMBALERT TGATE
SCL BGATE
SDA PGND 20µF
THB CSP THA BAT ILIM VSET
VLIM ITH 0.01µF IDC GND 6.04k10k
SMBALERT# Safety Signal
SMBCLK SMBCLK SMBDAT SMBDAT 4100 TA01
Figure 1. 4A Smart Battery Charger
4100fa
Page Summary Contents For LINEAR TECHNOLOGY LTC4100 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 285.41 KB |
| Published | June 19, 2026 |
Enter the captcha to get the download link:
Frequently Asked Questions
What are the key features of the LTC4100 charger controller?
It is a single chip that offers SMBus compliance, high efficiency synchronous buck charging with up to 4A capability, and programmable limits for safety.
How can I program the optimal charging status or limitations?
You can program charge current and voltage using 11-Bit and 10-Bit DACs respectively. Furthermore, Overvoltage/Overcurrent Limits are user-selectable via external resistors.
Does the charger system automatically manage power when supplying a load?
Yes, it automatically reduces charging current to prevent the AC adapter from overloading when simultaneously supplying load current.