MAX1730EUB-T Maxim Integrated Products, MAX1730EUB-T Datasheet

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MAX1730EUB-T

Manufacturer Part Number
MAX1730EUB-T
Description
Charge Pumps 50mA Regulated Step-Down
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1730EUB-T

Function
Step Down
Output Voltage
1.8 V, 1.9 V
Output Current
50 mA
Maximum Operating Temperature
+ 85 C
Package / Case
uMAX-10
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
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.
19-1618; Rev 0; 4/00
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.
2.7V TO 5.5V
Low-Voltage Logic Supplies
Wireless Handsets
PDAs
PC Cards
Hand-Held Instruments
INPUT
0.22µF
1µF
50mA Regulated Step-Down Charge Pump
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
SHDN
C1P
C1N
FB
MAX1730
General Description
GND
IN
PGND
OUT
C2P
C2N
Applications
1.8V OR 1.9V, UP TO 50mA
0.22µF
OUTPUT
4.7µF
o > 85% Peak Efficiency
o 50mA Guaranteed Output Current
o Dual-Mode 1.8V or 1.9V Output
o ±3% Output Voltage Accuracy
o Up to 2MHz Operating Frequency
o Small 0.22µF Capacitors
o No Inductor Required
o 2.7V to 5.5V Input Voltage Range
o Output Disconnects from Input in Shutdown Mode
o Small 10-Pin µMAX Package (1.09mm max height)
MAX1730EUB
for 1.8V or 1.9V Logic
TOP VIEW
PART
SHDN
GND
C1P
C1N
FB
1
2
3
4
5
-40°C to +85°C
TEMP. RANGE
Ordering Information
MAX1730
µMAX
Pin Configuration
10
9
8
7
6
10 µMAX
PIN-PACKAGE
IN
OUT
C2P
C2N
PGND
Features
1

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MAX1730EUB-T Summary of contents

Page 1

... Small 0.22µF Capacitors o No Inductor Required o 2.7V to 5.5V Input Voltage Range o Output Disconnects from Input in Shutdown Mode o Small 10-Pin µMAX Package (1.09mm max height) Applications PART MAX1730EUB TOP VIEW OUTPUT 1.8V OR 1.9V 50mA 4.7µF 0.22µF Features Ordering Information TEMP ...

Page 2

Regulated Step-Down Charge Pump for 1.8V or 1.9V Logic ABSOLUTE MAXIMUM RATINGS IN, OUT, SHDN GND .....................................-0.3V to +6V C1P, C1N, C2P, C2N to GND ......................-0. GND to PGND.....................................................................±0.3V Output Short-Circuit Duration ........................................Indefinite Continuous Power ...

Page 3

Regulated Step-Down Charge Pump ELECTRICAL CHARACTERISTICS = +3.6V GND, SHDN = IN PARAMETER SYMBOL Input Voltage Range Input Undervoltage Lockout Output Voltage V Output Leakage Current No-Load Supply Current Shutdown Supply Current Output Short-Circuit ...

Page 4

Regulated Step-Down Charge Pump for 1.8V or 1.9V Logic = +3.6V GND, SHDN = IN EFFICIENCY vs. OUTPUT CURRENT 100 ...

Page 5

Regulated Step-Down Charge Pump = +3.6V GND, SHDN = IN LINE-TRANSIENT RESPONSE MAX1730 TOC07 OUT AC-COUPLED 50mV/div 10µs/div PIN NAME Feedback Input. Connect FB to GND for a 1.8V ...

Page 6

... Charge-Pump Configurations Charge pumps work by passing energy through capaci- tors. They generally work in two phases. In the first phase, the input source charges the flying capacitors. The input capacitor helps reduce the source’s input impedance. In the second phase, the switching capacitors transfer their charge to the output as needed ...

Page 7

Regulated Step-Down Charge Pump NOTE: SWITCH STATES SET FOR STAGE 1. ALL SWITCHES REVERSE STATE FOR STAGE 2. Figure 1. 1:1 Capacitor Configuration OUT IN 3 ...

Page 8

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products Shutdown The MAX1730’ ...

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