Description
SY21242 High Efficiency 6V, 1MHz, 2.5A Current Limit Step-Up Regulator General .
The SY21242 high efficiency step-up regulator operates using current mode control, over an input voltage range from 2V to 6V.
Features
* Wide 2V to 6V Input Range
* Up to 6V Output Voltage
* Low RDS(ON) for Internal N-Channel
MOSFET: 120mΩ
* 2.5A Minimum Switch Current Limit
* 1MHz Switching Frequency
* Minimum On-Time: 100ns Typical
* Minimum Off-Time: 100ns Typical
* Internal Soft-Start Limits Inru
Applications
* Solar Battery Charger
* Backup Battery
Typical Application
VIN CIN
ON/OFF
L
LX
GND EN
VDD
R1 FB
R2
VOUT COUT
Figure 1. Typical Application Circuit
Efficiency (%)
Efficiency vs Load Current
91
90
89
88
87
86
VIN=3.5V, VOUT=5V
85
0
0.2
0.4
0.6
0.8
1 1.2
Load Current (