ETA1918S [ETA]
2.5A, 3MHz Switching Charger with Dynamic Power Path Management;
| 型号： | ETA1918S |
| 厂家： | 
ETA Semiconductor |
| 描述： | 2.5A, 3MHz Switching Charger with Dynamic Power Path Management |
| 文件： | 总1页 (文件大小：185K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ETA1918S
2.5A, 3MHz Switching Charger with Dynamic Power Path Management
DESCRIPTION
ETA1918S is a switching Li-Ion battery charger with dynamic power-path control and input current limiting. When a battery is connected,
depending on the battery voltage, the DC-DC switching regulator either pre-conditions, fast-charges the battery or just regulates a system
voltage (VSYS) to a preset voltage. It does not require an external sense resistor for current sensing. The charging current is determined by
programming ISET1 or ISET2 pin, depending on the state of the nUSB_DET. One should pull nUSB_DET low, if an USB adapter input is present,
the charge current is set by ISET2; otherwise, it is set by ISET1. When the battery voltage reaches the termination voltage i.e. 4.2V, the
charging path disconnects SYS to BATT. The ETA1918S also includes a dynamic power path when the SYS load current exceeds current limit
of the DCDC regulator internally set, the SYS voltage falls below VBATT, ETA1918S turns on the power-path to supplement the system load
through the battery.
FEATURES
APPLICATIONS
Switching Charger with Power Path Management
Up to 95% DC-DC Efficiency
50mΩ Power Path MOSFET
Up to 2.5A Max charging current
Instant on with a dead Battery or no Battery
No battery detection
No External Sense resistor
Programmable USB and AC IN Charging Current
Tablet, MID
Smart Phone
Power Bank
ORDERING INFORMATION
PART
ETA1918SQ3Q
PACKAGE PIN TOP MARK
QFN3X3-16
ETA-42
IN
5V INPUT
TYPICAL APPLICATION
10uF
SW
ENB
nUSB_DET
PGND
2.2uH
SYS
2.2K
SYS
22uF
BATT
SYSTEM
LOAD
ISET1
500Ω
ISET2
1uF
2KΩ
NTC
2A Switching Charger with Dynamic Power Path
www.ETAsolution.com
Outperform with Efficiency
1
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