参数资料
型号: LTC1502CS8-3.3
厂商: Linear Technology
文件页数: 1/8页
文件大小: 0K
描述: IC REG SWITCHED CAP 3.3V 8SOIC
标准包装: 100
类型: 切换式电容器(充电泵)
输出类型: 固定
输出数: 1
输出电压: 3.3V
输入电压: 0.9 V ~ 1.8 V
频率 - 开关: 500kHz
电流 - 输出: 10mA
同步整流器:
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 8-SOIC
LTC1502-3.3
Single Cell to 3.3V
Regulated Charge Pump
DC/DC Converter
FEATURES
DESCRIPTIO
s
s
s
s
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Input Voltage Range: 0.9V to 1.8V
0.9V Guaranteed Start-Up Voltage
Regulated Output Voltage: 3.3V ± 4%
Output Current: 10mA (V IN ≥ 1V)
No Inductors
Shutdown Disconnects Load from V IN
Low Operating Current: 40 μ A
Low Shutdown Current: 5 μ A
Short-Circuit and Overtemperature Protected
Application Circuit Fits in < 0.125in 2 PCB Area
Available in 8-Pin MSOP and SO Packages
The LTC ? 1502-3.3 is a quadrupler charge pump DC/DC
converter that produces a regulated 3.3V output from a
single alkaline cell input. It requires only five small external
capacitors—no inductors are required. Low supply cur-
rent (40 μ A typical, 5 μ A in shutdown) and minimal external
components make the LTC1502-3.3 ideal for space and
power conscious single-cell applications. The total printed
circuit board area of the circuit shown below is less than
0.125in 2 .
Forcing the C1 – /SHDN pin low through an external resis-
tive pull-down puts the part into shutdown mode. During
shutdown, the internal oscillator is stopped and the load is
Pagers
Battery Backup Supplies
Portable Electronic Equipment
Handheld Medical Instruments
Glucose Meters
APPLICATIO  S
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disconnected from V IN . An internal pull-up current on the
C1 – /SHDN pin forces the part back into normal operation
once the pull-down resistance is removed.
The LTC1502-3.3 is short-circuit protected and survives
an indefinite V OUT short to ground. The LTC1502-3.3 is
available in 8-pin MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Single Cell to 3.3V DC/DC Converter
Output Voltage vs Input Voltage
10 μ F
1
2
C2
C1 +
V OUT
C3 +
8
7
10 μ F
V OUT = 3.3V
I OUT = 10mA
3.5
3.4
T A = 25 ° C
1 μ F
3
4
LTC1502-3.3
C1 – /SHDN C3 –
GND V IN
6
5
1 μ F
10 μ F
V IN
SINGLE CELL
NiCd or
ALKALINE
1502-3.3 TA01
3.3
3.2
I OUT = 10mA
I OUT = 15mA
3.1
PCB LAYOUT FITS IN < 0.125IN 2
3.0
0.8
1.0
1.2
1.4
1.6
1.8
INPUT VOLTAGE (V)
1502-3.3 TA02
1
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