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PDF MAX8940 Data sheet ( Hoja de datos )
| Número de pieza | MAX8940 | |
| Descripción | 120mA Linear Regulator | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX8940 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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19-4662; Rev 0; 6/09
www.DataSheet4U.com
Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulator
General Description
The MAX8940 low-noise, low-dropout (LDO) linear reg-
ulator is designed to deliver up to 120mA continuous
output current. This regulator achieves a low 120mV
dropout for 120mA load current. The MAX8940 uses an
advanced architecture to achieve low output voltage
noise of 25µVRMS and PSRR of 45dB at 100kHz.
The MAX8940 is preset to either 2.8V or 3.0V. Designed
with a p-channel MOSFET series pass transistor, the
MAX8940 maintain very low ground current (40µA).
The regulator is designed and optimized to work with low-
value, low-cost ceramic capacitors. The MAX8940
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
Package is a 5-pin SC70.
Applications
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
Personal Stereos
Portable and Battery-Powered Equipment
Features
♦ Space-Saving SC70
♦ 25µVRMS Output Noise at 100Hz to 100kHz
Bandwidth
♦ 65dB PSRR at 10kHz
♦ 120mV Dropout at 120mA Load
♦ Stable with 1µF Ceramic Capacitor for Any Load
♦ Guaranteed 120mA Output
♦ Output Voltages: 2.8V or 3V
♦ Low 40µA Ground Current
♦ Excellent Load/Line Transient
♦ Overcurrent and Thermal Protection
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX8940EXKxy-T
-40°C to +85°C 5 SC70
MAX8940EXKxy+T
-40°C to +85°C 5 SC70
*xy is the output voltage code (see Output Voltage Selector
Guide).
+Denotes a lead(Pb)-free/RoHS-compliant package.
Output Voltage Selector Guide
PART
MAX8940EXK28-T
MAX8940EXK30-T
VOUT (V)
2.8
3
TOP MARK
AUE
AUD
Pin Configuration
TOP VIEW
IN 1
5 OUT
GND 2 MAX8940
SHDN 3
4 BP
SC70
Typical Operating Circuit
INPUT
2V TO 6V
CIN = 1µF
ON
OFF
PRESET OUTPUT
2.8V OR 3.0V
IN OUT
MAX8940
SHDN
GND
BP CBP = 10nF
COUT = 1µF
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Low-Noise, High PSRR,
Low-Dropout, 120mA Linear Regulator
Typical Operating Characteristics (continued)
(VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA = +25°C, unless otherwise noted.)
OUTPUT NOISE vs. BP CAPACITANCE
25
LOAD TRANSIENT RESPONSE
MAX8940 toc12
LOAD TRANSIENT
RESPONSE NEAR DROPOUT
MAX8940 toc13
20
VIN = 3.5V
VIN = 3.1V
ILOAD = 0 TO 50mA
ILOAD = 0 TO 50mA
VOUT = 3V
15
10
VOUT
VOUT
10mV/div
10mV/div
5
0
1 10 100
BP CAPACITANCE (nF)
1ms/div
1ms/div
LINE TRANSIENT RESPONSE
MAX8940 toc14
VIN = 3.5V TO 4V
EXITING SHUTDOWN WAVEFORM
MAX8940 toc15
SHUTDOWN VOLTAGE
VOUT = 2.8V
RLOAD = 47Ω
ENTERING SHUTDOWN DELAY
MAX8940 toc16
CBP = 0.01µF
VOUT = 2.8V
SHUTDOWN
VOLTAGE
200µs/div
VOUT
2mV/div
OUTPUT VOLTAGE
2V/div
20µs/div
OUTPUT VOLTAGE
2V/div
40µs/div
SHUTDOWN EXIT DELAY
MAX8940 toc17
VOUT = 3V
CBP = 100nF
VOUT
1V/div
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
100
10
SHUTDOWN
VOLTAGE
20µs/div
1
0.1
STABLE REGION
0.01
0
20 40 60 80 100 120
LOAD CURRENT (mA)
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX8940.PDF ] | |
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