参数资料
| 型号： | SC1462ISKTRT |
| 厂商： | Semtech |
| 文件页数： | 5/10页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP DBL ADJ SOT23 |
| 标准包装： | 1 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 12V |
| 输入电压： | 1.65 V ~ 5.5 V |
| 频率 - 开关： | 160kHz |
| 电流 - 输出： | 80mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-6 |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC1462ISKDKR |
Pin Con ?
POWER MANAGEMENT
Applications guration Information
NOT RECOMMENDED FOR NEW DESIGN
SC1462
Theory of Operation
The SC1462 utilizes a switched capacitor charge pump to
generate an output voltage approximately 2 × V IN .
An internal oscillator generates two out of phase ? xed fre-
quency clock signals which turn on and off internal MOS-
FET switches. During phase 1, the ? ying charge pump
capacitor is charged to V IN through switches S1 and S2.
During phase 2, the ? ying charge pump capacitor is con-
nected in series with the input voltage via S3 and S4, pro-
ducing an output voltage.
If V OUT is less than V IN - 200mV, then all switches are turned
off and V OUT is charged with a 200mA current source from
V IN . When V OUT reaches V IN - 200mV, the current source is
disconnected from output and the charge pump circuitry
is enabled again.
Output Current
The dropout voltage for a charge pump doubler is de ? ned
as (2 × V IN ) - V OUT . The maximum output current is usually
speci ? ed as that which will not cause the dropout voltage
to exceed the requirements of the application. The calcu-
lation of the dropout voltage is given in the capacitor se-
ON
Charge transfer from C IN to C BUCKET
lection section on Page 6. Typical dropout voltages versus
I OUT are graphed on Page 8.
S1,S2
OFF
ON
S3,S4
OFF
Charge transfer from:
C IN and C BUCKET to C OUT (Doubler)
Thermal Shutdown
The thermal shutdown circuit provides added protection
to the SC1462. During a V OUT short circuit condition or if
the load is excessive, the over-temperature circuitry will
shut down the charge pump if the junction temperature
exceeds approximately 140°C. The charge pump is en-
abled only if the junction temperature drops to approxi-
mately 120°C. The SC1462 will cycle in and out of ther-
mal shut down until the short circuit or the excessive load
V IN
1
1
S1
S3
2
2
1
C BUCKET
1
S4
S2
2
2
V OUT = 2 x V IN
C OUT
condition on V OUT is removed, thereby improving device re-
liability. The junction temperature can be calculated from
the following formula if the ambient temperature (T A ) and
the charge pump power dissipation (P DISS ) are known.
Cin
Doubler
Short Circuit/Soft-Start
An internal current limit and soft-start circuit provides pro-
tection against output short circuit and limits large cur-
rent spikes generated during the initial start-up to charge
output capacitor.
T J = T A + P DISS × θ JA ; θ JA = 230 °C/W
? 2005 Semtech Corp.
5
www.semtech.com
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