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PDF LTC1503IS8-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC1503IS8-2 | |
| Descripción | High Efficiency Inductorless Step-Down DC/DC Converters | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1503-1.8/LTC1503-2
High Efficiency Inductorless
Step-Down DC/DC Converters
FEATURES
s Input Voltage Range: 2.4V to 6V
s Fixed Output Voltages: 1.8V ±4%, 2V ±4%
s Output Current: Up to 100mA
s No Inductors
s Typical Efficiency 25% Higher than LDOs
s Low Operating Current: 25µA
s Low Shutdown Current: 5µA
s 600kHz Switching Frequency
s Shutdown Disconnects Load from VIN
s Soft-Start Limits Inrush Current at Turn-On
s Short-Circuit and Overtemperature Protected
s Available in 8-Pin MSOP and SO Packages
U
APPLICATIO S
s Cellular Phones
s Handheld Computers
s Smart Card Readers
s Low Power DSP Supplies
s Portable Electronic Equipment
s Handheld Medical Instruments
DESCRIPTIO
The LTC®1503-1.8/LTC1503-2 are switched capacitor
step-down DC/DC converters that produce a regulated
output from a 2.4V to 6V input. The parts use switched
capacitor fractional conversion to achieve high efficiency
over the entire input range. No inductors are required.
Internal circuitry controls the step-down conversion ratio
to optimize efficiency as the input voltage and load condi-
tions vary. Typical efficiency is 25% higher than that of a
low dropout (LDO) linear regulator.
Regulation is achieved by sensing the output voltage and
enabling the internal switching network as needed to
maintain a fixed output voltage. This method of regulation
enables the parts to achieve high efficiency at extremely
light loads. Low operating current (25µA with no load, 5µA
in shutdown) and low external parts count (two 1µF flying
capacitors and two 10µF bypass capacitors) make the
LTC1503-1.8/LTC1503-2 ideally suited for space con-
strained battery-powered applications. The parts are fully
short-circuit and overtemperature protected.
The LTC1503-1.8/LTC1503-2 are available in 8-pin MSOP
and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
1-CELL Li-Ion OR
3-CELL NiMH
Single Li-Ion to 2V DC/DC Converter
10µF
1µF
LTC1503-2
4
VIN
2 C1–
3 C1+
VOUT
C2 –
C2+
1
8
6
5 SHDN/SS GND 7
1µF
VOUT = 2V
IOUT = 100mA
10µF
1503-1.8/2 TA01
Efficiency vs Input Voltage
100
IOUT = 100mA
80
IOUT = 1mA
60
“IDEAL” LDO
40
LTC1503-2
VOUT = 2V
20
23 4 5
INPUT VOLTAGE (V)
6
1503-1.8/2 TA02
1
1 page  
LTC1503-1.8/LTC1503-2
PI FU CTIO S
turn-on (see Applications Information). If neither of the
two functions are desired, the pin may be floated or tied
to VIN.
C2+ (Pin 6): Flying Capacitor Two Positive Terminal.
GND (Pin 7): Ground. Connect to a ground plane for best
performance.
C2 – (Pin 8): Flying Capacitor Two Negative Terminal.
BLOCK DIAGRA
VIN
CIN
680k
330k
990k
+
–
+
–
VIN
2µA
SHDN/SS
+
+
350mV
–
MODE
CONTROL
VOUT
SHORT CIRCUIT
MODE SKIP
COMP2
STEP-DOWN
CHARGE
PUMP
C1+
C1–
C2 +
C2 –
VOUT
COUT
+
150mV
800k
+ 10mV
600kHz
OSCILLATOR
350mV
–
+
SHDN
REG ENABLE
COMP1
SOFT-START
VREF RAMP
1.2V
VREF
1.2M
GND
LTC1503-2
1503-1.8/2 BD
5
5 Page 
LTC1503-1.8/LTC1503-2
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
8 765
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
12
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.014 – 0.019
(0.355 – 0.483)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
34
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
SO8 1298
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 LTC1503IS8-2.PDF ] | |
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