参数资料
| 型号： | SC122ULTRT |
| 厂商： | Semtech |
| 文件页数： | 1/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 3.3V 95MA 6MLPD |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 0.7 V ~ 1.6 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 95mA |
| 同步整流器： | 是 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-MLPD-UT |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-MLPD-UT（1.5x2.0） |
| 其它名称： | SC122ULTRTDKR |
SC122
Low Voltage Synchronous
Boost Converter
POWER MANAGEMENT
Features
Input voltage — 0.7V to 1.6V
Minimum start-up voltage — 0.85V
Output voltage fixed at 3.3V
Peak input current limit — 350mA typically
Output current 95mA at V IN = 1.6V, 50mA at V IN = 0.9V
Effi ciency up to 80%
Internal synchronous rectifier
Switching frequency — 1.2MHz
Power save (voltage hysteretic) control
Anti-ringing circuit
Operating supply current (measured at OUT) — 40μA
No forward conduction path during shutdown
MLPD-UT-6 1.5 × 2.0 × 0.6 (mm) package
Lead-free and halogen-free
WEEE and RoHS compliant
Applications
Electric toothbrushes
Personal medical products
Single-cell alkaline, NiCd, or NiMH applications
Description
The SC122 is a high efficiency, low noise, synchronous
step-up DC-DC converter. It produces a fixed 3.3V output
from a single cell alkaline or NiMH battery. It features an
internal 1.2A switch and synchronous rectifier to achieve
high effi ciency and to eliminate the need for an external
Schottky diode.
The SC122 operates exclusively in voltage-hysteretic
power save mode (PSAVE) for high effi ciency under light
load conditions. It features anti-ringing circuitry for
reduced EMI in noise sensitive applications. While dis-
abled, the output remains in a high impedance state to
preserve the charge on the output capacitor. This permits
ultra-low idle quiescent currents in applications in which
the SC122 can be periodically enabled by an external con-
troller to recharge the output capacitor.
Low quiescent current is obtained despite a high 1.2MHz
operating frequency. Small external components and the
space saving MLPD-UT-6, 1.5×2.0×0.6 (mm) package,
make this device an excellent choice for small handheld
applications that require the longest possible battery life.
Typical Application Circuit
L1
Single
IN
LX
Cell
EN
OUT
3.3V
(1.2V)
C IN
GND
GND
C OUT
SC122
February 1, 2010
? 2010 Semtech Corporation
1
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