鈮?/div>
2.5V)
Ultralow Power: 20碌A Quiescent Current
Regulated Output Voltage: 3.3V
鹵4%,
5V
鹵4%,
ADJ
No Inductors
Short-Circuit/Thermal Protection
V
IN
Range: 2V to 5.5V
800kHz Switching Frequency
Very Low Shutdown Current: <2碌A
Shutdown Disconnects Load from V
IN
PowerGood/Undervoltage Output
Adjustable Soft-Start Time
Available in an 8-Pin MSOP Package
The LTC
廬
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碌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.
APPLICATIO S
s
s
s
s
s
Li-Ion Battery Backup Supplies
Local 3V and 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
White LED Backlighting
TYPICAL APPLICATIO
Regulated 5V Output from a 2.7V to 5.5V Input
V
IN
2.7V
TO 5.5V
3
C2
10碌F
7
2
R1
100k
V
OUT
5V
鹵4%
C1
I
10碌F
OUT
鈮?/div>
100mA, V
IN
鈮?/div>
3V
I
OUT
鈮?/div>
50mA, V
IN
鈮?/div>
2.7V
OUTPUT VOLTAGE (V)
V
IN
V
OUT
OFF ON
1
SHDN
PGOOD
LTC1751-5
8
6
SS
C
+
4
GND
C
鈥?/div>
1751 TA01
PGOOD
5
C
FLY
1碌F
C
FLY
= MURATA GRM39X5R105K6.3AJ
C1, C2 = MURATA GRM40X5R106K6.3AJ
U
Output Voltage vs Input Voltage
5.2
I
OUT
= 50mA
C
FLY
= 1碌F
C
OUT
= 10碌F
5.1
T
A
= 85擄C
T
A
= 25擄C
5.0
T
A
= 鈥?0擄C
4.9
4.8
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
5.0
5.5
1751 TA02
U
U
1
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描述
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