Rainbow-electronics MAX1730 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX1730. Rainbow Electronics MAX1730 User Manual Manual do Utilizador

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General Description
The MAX1730 regulated step-down charge pump gen-
erates up to 50mA at fixed output voltages of 1.8V or
1.9V from an input voltage in the 2.7V to 5.5V range.
Specifically designed to provide high-efficiency logic
supplies in applications that demand a compact
design, the MAX1730 employs fractional conversion
techniques to provide efficiency exceeding that of a lin-
ear regulator.
The MAX1730 operates at up to 2MHz, permitting the
use of small 0.22µF flying capacitors while maintaining
low 75µA quiescent supply current. Proprietary soft-
start circuitry prevents excessive current from being
drawn from the supply during startup, making the
MAX1730 compatible with higher impedance sources
such as alkaline and lithium-ion cells.
The MAX1730 is available in a space-saving 10-pin
µMAX package that is only 1.09mm high and occupies
one-half the area of an 8-pin SO.
Applications
Low-Voltage Logic Supplies
Wireless Handsets
PDAs
PC Cards
Hand-Held Instruments
Features
> 85% Peak Efficiency
50mA Guaranteed Output Current
Dual-Mode 1.8V or 1.9V Output
±3% Output Voltage Accuracy
Up to 2MHz Operating Frequency
Small 0.22µF Capacitors
No Inductor Required
2.7V to 5.5V Input Voltage Range
Output Disconnects from Input in Shutdown Mode
Small 10-Pin µMAX Package (1.09mm max height)
MAX1730
50mA Regulated Step-Down Charge Pump
for 1.8V or 1.9V Logic
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
IN
OUT
C2P
C2NC1N
C1P
SHDN
FB
MAX1730
µMAX
TOP VIEW
PGNDGND
0.22µF
MAX1730
OUT
C2P
C2N
PGND
0.22µF
4.7µF
1µF
GND
IN
C1P
C1N
FB
OUTPUT
1.8V OR 1.9V, UP TO 50mA
INPUT
2.7V TO 5.5V
SHDN
Typical Operating Circuit
19-1618; Rev 0; 4/00
PART
MAX1730EUB -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
10 µMAX
Pin Configuration
Ordering Information
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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Resumo do Conteúdo

Página 1 - TOP VIEW

General DescriptionThe MAX1730 regulated step-down charge pump gen-erates up to 50mA at fixed output voltages of 1.8V or1.9V from an input voltage in

Página 2 - ELECTRICAL CHARACTERISTICS

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic2 ___________________________________________________________________________________

Página 3

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic_____________________________________________________________________________________

Página 4

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic4 ___________________________________________________________________________________

Página 5 - Pin Description

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V Logic_____________________________________________________________________________________

Página 6 - Functional Diagram

MAX1730Detailed DescriptionThe MAX1730 step-down charge pump automaticallyswitches between charge pump configurations (Figures1, 2, and 3) and utilize

Página 7 - Applications Information

To maximize efficiency, the MAX1730 automaticallyswitches between charge-pump configurations (Figures1, 2, and 3). Efficiency is greatest when the IN/

Página 8 - Package Information

MAX173050mA Regulated Step-Down Charge Pumpfor 1.8V or 1.9V LogicMaxim cannot assume responsibility for use of any circuitry other than circuitry enti

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