LTC1503CS8-1.8 Linear Technology, LTC1503CS8-1.8 Datasheet

IC BUCK/SW CAP 1.8V .1A 8SOIC

LTC1503CS8-1.8

Manufacturer Part Number
LTC1503CS8-1.8
Description
IC BUCK/SW CAP 1.8V .1A 8SOIC
Manufacturer
Linear Technology
Type
Step-Down (Buck), Switched Capacitor (Charge Pump)r
Datasheet

Specifications of LTC1503CS8-1.8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.8V
Current - Output
100mA
Frequency - Switching
600kHz
Voltage - Input
2.4 ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1503CS8-1.8
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC1503CS8-1.8
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1503CS8-1.8#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1503CS8-1.8#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
1-CELL Li-Ion OR
TYPICAL APPLICATIO
APPLICATIO S
3-CELL NiMH
Input Voltage Range: 2.4V to 6V
Fixed Output Voltages: 1.8V 4%, 2V 4%
Output Current: Up to 100mA
No Inductors
Typical Efficiency 25% Higher than LDOs
Low Operating Current: 25 A
Low Shutdown Current: 5 A
600kHz Switching Frequency
Shutdown Disconnects Load from V
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit and Overtemperature Protected
Available in 8-Pin MSOP and SO Packages
Cellular Phones
Handheld Computers
Smart Card Readers
Low Power DSP Supplies
Portable Electronic Equipment
Handheld Medical Instruments
10 F
U
Single Li-Ion to 2V DC/DC Converter
1 F
4
2
3
5
U
V
C1
C1
SHDN/SS
IN
LTC1503-2
+
IN
V
GND
C2
OUT
C2
+
1
8
6
7
1 F
Step-Down DC/DC Converters
10 F
High Efficiency Inductorless
DESCRIPTIO
The LTC
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 (25 A with no load, 5 A
in shutdown) and low external parts count (two 1 F flying
capacitors and two 10 F 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.
V
I
OUT
OUT
1503-1.8/2 TA01
= 100mA
= 2V
®
1503-1.8/LTC1503-2 are switched capacitor
LTC1503-1.8/LTC1503-2
U
100
60
40
20
80
2
LTC1503-2
V
OUT
Efficiency vs Input Voltage
= 2V
3
INPUT VOLTAGE (V)
4
I
“IDEAL” LDO
OUT
I
= 1mA
OUT
5
= 100mA
1503-1.8/2 TA02
1
6

Related parts for LTC1503CS8-1.8

LTC1503CS8-1.8 Summary of contents

Page 1

... F 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. LTC1503 OUT ...

Page 2

... SS Note 3: Currents flowing into the device are positive polarity. Currents flowing out of the device are negative polarity. Note 4: When V the maximum rated output current to prevent damage to the output devices. ORDER PART NUMBER TOP VIEW – LTC1503CS8-1 LTC1503CS8-2 7 GND + LTC1503IS8-1 LTC1503IS8-2 ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS LTC1503-X Input Operating Current vs Input Voltage 0mA OUT – ...

Page 4

LTC1503-1.8/LTC1503 TYPICAL PERFOR A CE CHARACTERISTICS LTC1503-X Output Short-Circuit Current vs Input Voltage 40 V SHORTED TO GND OUT – INPUT VOLTAGE (V) ...

Page 5

CTIO S turn-on (see Applications Information). If neither of the two functions are desired, the pin may be floated or tied (Pin 6): Flying Capacitor Two Positive Terminal. W ...

Page 6

LTC1503-1.8/LTC1503 APPLICATIO S I FOR ATIO General Operation The two most common methods for providing regulated step-down DC/DC conversion are linear DC/DC conversion (used by LDOs) and inductor-based DC/DC conversion. Linear regulation provides low cost and low complexity, ...

Page 7

U U APPLICATIO S I FOR ATIO (EXTERNAL) – (EXTERNAL) – GND Figure 1b. Step-Down Charge Pump in 3-to-2 Mode In 1-to-1 ...

Page 8

LTC1503-1.8/LTC1503 APPLICATIO S I FOR ATIO approximately 1.9V. Since the ramp rate on the SHDN/SS pin controls the ramp rate on V OUT current can be controlled through selection For example, a 4.7nF capacitor ...

Page 9

U U APPLICATIO S I FOR ATIO capacitor reduce both the low and high fre- OUT quency ripple filter may also be used to reduce high frequency voltage spikes. LTC1503-X V OUT + 10 F ...

Page 10

LTC1503-1.8/LTC1503-2 PACKAGE DESCRIPTIO 0.007 (0.18) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH ...

Page 11

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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. ...

Page 12

... Input Range; V Low Dropout Operation; 100% Duty Cycle 50mA Output Current, I 50mA Output Current 1.8V OUT I = 100mA OUT 10 F 1503-1.8/2 TA03 = 10 A; 8-Lead MSOP Q = 10mA OUT Q from 0.8V 500mA; OUT OUT = 150312f LT/TP 0200 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1999 ...

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