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参数资料
| 型号： | LTC1751EMS8-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP DBL 5V 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 切换式电容器（充电泵），倍增器 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 800kHz |
| 电流 - 输出： | 125mA |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
LTC1751/LTC1751-3.3/LTC1751-5
Micropower, Regulated
Charge Pump
DC/DC Converters
FEATURES
DESCRIPTIO
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5V Output Current: 100mA (V IN ≥ 3V)
3.3V Output Current: 80mA (V IN ≥ 2.5V)
Ultralow Power: 20 μ A Quiescent Current
Regulated Output Voltage: 3.3V ± 4%, 5V ± 4%, ADJ
No Inductors
Short-Circuit/Thermal Protection
V IN Range: 2V to 5.5V
800kHz Switching Frequency
Very Low Shutdown Current: <2 μ A
Shutdown Disconnects Load from V IN
PowerGood/Undervoltage Output
Adjustable Soft-Start Time
Available in an 8-Pin MSOP Package
The LTC ? 1751 family are micropower charge pump DC/
DC converters that produce a regulated output voltage at
up to 100mA. The input voltage range is 2V to 5.5V.
Extremely low operating current (20 μ A typical with no
load) and low external parts count (one flying capacitor
and two small bypass capacitors at V IN and V OUT ) make
them ideally suited for small, battery-powered applica-
tions.
The LTC1751 family operate as Burst Mode TM switched
capacitor voltage doublers to achieve ultralow quiescent
current. They have thermal shutdown capability and can
survive a continuous short circuit from V OUT to GND. The
PGOOD pin on the LTC1751-3.3 and LTC1751-5 indicates
when the output voltage has reached its final value and if
Li-Ion Battery Backup Supplies
Local 3V and 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
White LED Backlighting
APPLICATIO S
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the output has an undervoltage fault condition. The FB pin
of the adjustable LTC1751 can be used to program the
desired output voltage or current. An optional soft-start
capacitor may be used at the SS pin to prevent excessive
inrush current during start-up.
The LTC1751 family is available in an 8-pin MSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Output Voltage vs Input Voltage
Regulated 5V Output from a 2.7V to 5.5V Input
5.2
5.1
I OUT = 50mA
C FLY = 1 μ F
C OUT = 10 μ F
5V ± 4%
10 μ F OUT ≤ 100mA, V IN ≥ 3V
V IN
2.7V
TO 5.5V
C2
10 μ F
OFF ON
3
7
V IN
SHDN
V OUT
PGOOD
2
1
R1
100k
PGOOD
C1
V OUT
I
I OUT ≤ 50mA, V IN ≥ 2.7V
5.0
T A = 85 ° C
T A = 25 ° C
8
4
LTC1751-5
SS
GND
C +
C –
6
5
C FLY
1 μ F
4.9
T A = –40 ° C
1751 TA01
C FLY = MURATA GRM39X5R105K6.3AJ
C1, C2 = MURATA GRM40X5R106K6.3AJ
4.8
2.5
3.0
3.5 4.0 4.5
5.0
5.5
INPUT VOLTAGE (V)
1751 TA02
1
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