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參數資料
| 型號： | LTC1751 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower, Regulated Charge Pump DC/DC Converters |
| 中文描述： | 微功耗，穩壓電荷泵DC / DC轉換器 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 211K |
| 代理商： | LTC1751 |
1
LTC1751/LTC1751-3.3/LTC1751-5
Micropower, Regulated
Charge Pump
DC/DC Converters
APPLICATIU
FEATURES
DESCRIPTIOU
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
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 APPLICATIOU
I
5V Output Current: 100mA (V
IN
≥
3V)
I
3.3V Output Current: 80mA (V
IN
≥
2.5V)
I
Ultralow Power: 20
μ
A Quiescent Current
I
Regulated Output Voltage: 3.3V
±
4%, 5V
±
4%, ADJ
I
No Inductors
I
Short-Circuit/Thermal Protection
I
V
IN
Range: 2V to 5.5V
I
800kHz Switching Frequency
I
Very Low Shutdown Current: <2
μ
A
I
Shutdown Disconnects Load from V
IN
I
PowerGood/Undervoltage Output
I
Adjustable Soft-Start Time
I
Available in an 8-Pin MSOP Package
I
Li-Ion Battery Backup Supplies
I
Local 3V and 5V Conversion
I
Smart Card Readers
I
PCMCIA Local 5V Supplies
I
White LED Backlighting
V
IN
SHDN
SS
GND
2
1
6
5
3
7
8
4
V
OUT
PGOOD
C
+
C
–
LTC1751-5
V
OUT
5V
±
4%
I
OUT
≤
100mA, V
IN
≥
3V
I
OUT
≤
50mA, V
IN
≥
2.7V
V
IN
2.7V
TO 5.5V
C2
10
μ
F
C
FLY
1
μ
F
PGOOD
R1
100k
OFF ON
1751 TA01
C1
10
μ
F
C
= MURATA GRM39X5R105K6.3AJ
C1, C2 = MURATA GRM40X5R106K6.3AJ
Regulated 5V Output from a 2.7V to 5.5V Input
Output Voltage vs Input Voltage
INPUT VOLTAGE (V)
2.5
4.8
O
4.9
5.0
5.1
5.2
3.0
3.5
4.0
4.5
1751 TA02
5.0
5.5
I
OUT
= 50mA
C
FLY
= 1
μ
F
C
OUT
= 10
μ
F
T
A
= 25
°
C
T
A
= –40
°
C
T
A
= 85
°
C
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