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PDF LTC1754-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LTC1754-3.3 | |
| Descripción | Micropower/ Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23 | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1754-3.3/LTC1754-5
Micropower, Regulated
3.3V/5V Charge Pump with
Shutdown in SOT-23
FEATURES
s Ultralow Power: IIN = 13µA
s Regulated Output Voltage: 3.3V ±4%, 5V ±4%
s 5V Output Current: 50mA (VIN ≥ 3.0V)
s 3.3V Output Current: 40mA (VIN ≥ 2.5V)
s No Inductors Needed
s Very Low Shutdown Current: <1µA
s Shutdown Disconnects Load from VIN
s Internal Oscillator: 600kHz
s Short-Circuit and Overtemperature Protected
s Ultrasmall Application Circuit: (0.052 Inch2)
s 6-Pin SOT-23 Package
U
APPLICATIO S
s SIM Interface Supplies for GSM Cellular Telephones
s White LED Power Supplies
s Li-Ion Battery Backup Supplies
s Handheld Computers
s Smart Card Readers
s PCMCIA Local 5V Supplies
DESCRIPTIO
The LTC®1754 is a micropower charge pump DC/DC
converter that produces a regulated output. The input
voltage range is 2V to 4.4V for 3.3V output and 2.7V to
5.5V for 5V output. Extremely low operating current and a
low external parts count (one flying capacitor and two
small bypass capacitors at VIN and VOUT) make the LTC1754
ideally suited for small, battery-powered applications. The
total component area of the application circuit shown
below is only 0.052 inch2.
The LTC1754 operates as a Burst ModeTM switched capaci-
tor voltage doubler to produce a regulated output. It has
thermal shutdown capability and can survive a continuous
short circuit from VOUT to GND.
The LTC1754 is available in a 6-pin SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
VOUT
10µF
ON/OFF
1
VOUT
C+ 6
LTC1754-X
25
GND VIN
3 SHDN C – 4
1µF
VIN
10µF
1754 TA01
Regulated 3.3V Output from 2V to 4.4V Input
VOUT = 3.3V ± 4%
IOUT = 0mA TO 20mA, VIN > 2.0V
IOUT = 0mA TO 40mA, VIN > 2.5V
Regulated 5V Output from 2.7V to 5.5V Input
VOUT = 5V ± 4%
IOUT = 0mA TO 25mA, VIN > 2.7V
IOUT = 0mA TO 50mA, VIN > 3.0V
LTC1754-3.3
Output Voltage vs Supply Voltage
3.40
IOUT = 20mA
COUT = 10µf
CFLY = 1µF
3.35
TA = 85°C
3.30 TA = 25°C
TA = –40°C
3.25
3.20
2.0
2.5 3.0 3.5 4.0
SUPPLY VOLTAGE (V)
4.5
1754 TA02
LTC1754-5
Output Voltage vs Supply Voltage
5.15
IOUT = 25mA
COUT = 10µF
5.10 CFLY = 1µF
5.05
TA = 25°C
5.00
4.95
TA = 85°C
TA = –40°C
4.90
4.85
2.5
3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0 5.5
1574 TA03
1
1 page  
LTC1754-3.3/LTC1754-5
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1754-3.3. LTC1754-5, TA = 25°C unless otherwise noted.
Efficiency vs Supply Voltage
100 TA = 25°C
90 CFLY = 1µF
80
LTC1754-5
70 IOUT = 25mA
60
50 LTC1754-3.3
40 IOUT = 20mA
30
2.0 2.5
3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0 5.5
1754 G19
Oscillator Frequency
vs Supply Voltage
850
800
750 TA = 85°C
700
650 TA = 25°C
600
550 TA = –40°C
500
450
2.0 2.5
3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0 5.5
1754 G20
VSHDN Threshold Voltage
vs Supply Voltage
0.95
0.90
TA = –40°C
0.85
TA = 25°C
0.80
TA = 85°C
0.75
0.70
0.65
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
1754 G21
PI FU CTIO S
VOUT (Pin 1): Regulated Output Voltage. For best perfor-
mance, VOUT should be bypassed with a 6.8µF (min) low
ESR capacitor as close as possible to the pin.
GND (Pin 2): Ground. Should be tied to a ground plane for
best performance.
SHDN (Pin 3): Active Low Shutdown Input. A low on
SHDN disables the LTC1754. SHDN must not be allowed
to float.
C– (Pin 4): Flying Capacitor Negative Terminal.
VIN (Pin 5): Input Supply Voltage. VIN should be bypassed
with a 6.8µF (min) low ESR capacitor.
C + (Pin 6): Flying Capacitor Positive Terminal.
SI PLIFIED BLOCK DIAGRA
VOUT
COUT
10µF
SHDN
+
COMP1
–
VREF
*
2
1
CONTROL
2
1
C+
CFLY
1µF
CIN
10µF
VIN
C–
1754 BD
*CHARGE PUMP SHOWN IN PHASE 1, THE CHARGING PHASE.
PHASE 1 IS ALSO THE SHUTDOWN PHASE
5
5 Page 
LTC1754-3.3/LTC1754-5
PACKAGE DESCRIPTION Dimensions in inches (millimeters), unless otherwise noted.
S6 Package
6-Lead Plastic SOT-23
(LTC DWG # 05-08-1634)
2.80 – 3.00
(0.110 – 0.118)
(NOTE 3)
2.6 – 3.0
(0.110 – 0.118)
1.50 – 1.75
(0.059 – 0.069)
1.90
(0.074)
REF
0.00 – 0.15
(0.00 – 0.006)
0.95
(0.037)
REF
0.90 – 1.45
(0.035 – 0.057)
0.35 – 0.55
(0.014 – 0.022)
0.09 – 0.20
(0.004 – 0.008)
(NOTE 2)
0.35 – 0.50
(0.014 – 0.020)
SIX PLACES (NOTE 2)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DIMENSIONS ARE INCLUSIVE OF PLATING
3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
4. MOLD FLASH SHALL NOT EXCEED 0.254mm
5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
0.90 – 1.30
(0.035 – 0.051)
S6 SOT-23 0898
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1754-3.3.PDF ] | |
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