Description
SY21222 High Efficiency 1MHz, 2A Current Limit, Step-Up Regulator General .
The SY21222 high efficiency DC-to-DC step-up regulator operates using current mode control, and can deliver 2A current over a wide input voltage range.
Features
* 3V to 33V Input Voltage Range
* 33V Maximum VOUT
* 2A Internal MSOFET Current Limit
* 5µA Shutdown Current (Typ. )
* 100µA Iq (Typ. )
* Low RDS(ON) for Internal N-Channel
MOSFET: 200mΩ
* 1MHz Switching Frequency
* Minimum On-Time: 100ns Typical
* Minimum Off-Time:
Applications
* Digital Camera
* Cell Phone
* PDA, PMP, MP3
Typical Application
2
Efficiency (%)
VIN 5V
L1 4.7µH
CIN 10uF
5 IN
1 LX
6 NC SY21222
ON/ OFF
4 EN
3 FB
GND
R3 1M
R1 200k
R2 10.5k
VOUT 12V
COUT 10µFх2
Figure 1. Typical Application Circuit
Efficiency vs. Input Voltage
VIN=5V,
