参数资料
| 型号： | SC198MLTRT |
| 厂商： | Semtech |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC PROG .6A 20MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可编程 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 包装： | 标准包装 |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC198MLDKR |
NOT RECOMMENDED FOR NEW DESIGN SC198
Dual DC-DC Buck Converter
with High Current Capability
POWER MANAGEMENT
Description
The SC198 is a high-ef ? ciency, dual synchronous buck
converter designed for use in low power applications. Each
converter is capable of supplying up to 600mA of average
current at one of eight programmable output voltages
commonly used as microprocessor supply voltages.
The SC198 uses a single control logic block for the two
converters, but their controls can be set independently.
The SC198 employs a ? exible clocking scheme that
allows the user to use the ? xed internal 1MHz oscillator or
synchronize the clock to an external source. The device
also has an optional power-save mode that optimizes
ef ? ciency for light loads.
The SC198 provides output voltage ? exibility while
conserving board space by using control pins to select
the output voltage instead of external resistor voltage
divider circuits. This eliminates at least four parts from
the traditional dual buck converter bill of materials.
Features
Dual buck converters with independent control
High ef ? ciency - over 90% peak
8 programmable output voltages
Input voltage range between 2.7V to 5.5V
Fixed-frequency operation - 1MHz
Optional SYNC clock input
Optional power-save under light-load conditions
Shutdown current <1 μ A
Soft-start to limit in-rush current
4mm x 4mm MLPQ package
Applications
Mobile phones
Cordless phones
MP3 players
Digital cameras
PDAs
Single li-ion cell or (3) NiMH/NiCd cell devices
Digital multimedia broadcast (DMB) devices
Portable gaming systems
Typical Application Circuit
10 μ F
1
18
15
20
5
6
7
16
11
VINA
VINR
VINB
ENA
CTLA0
CTLA1
CTLA2
ENB
CTLB0
SC198
LXA
VOUTA
GNDA
LXB
VOUTB
GNDB
2
4
3
14
12
13
4.7 μ H
4.7 μ H
10 μ F
10 μ F
VOUTA
VOUTB
March 28, 2007
10
9
17
CTLB1
CTLB2
SYNC
1
GNDR
8
www.semtech.com
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