MAX1857EUA47+ Maxim Integrated Products, MAX1857EUA47+ Datasheet

IC REG LDO 4.75/ADJ 500MA 8-UMAX

MAX1857EUA47+

Manufacturer Part Number
MAX1857EUA47+
Description
IC REG LDO 4.75/ADJ 500MA 8-UMAX
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1857EUA47+

Regulator Topology
Positive Fixed or Adjustable
Voltage - Output
4.75V, 1.25 ~ 5 V
Voltage - Input
2.5 ~ 5.5 V
Number Of Regulators
1
Current - Output
500mA (Min)
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Number Of Outputs
2
Polarity
Positive
Input Voltage Max
5.5 V
Output Voltage
1.25 V to 5 V, 4.75 V
Output Type
Adjustable, Fixed
Dropout Voltage (max)
175 mV
Output Current
500 mA
Line Regulation
0.15 %/V
Load Regulation
0.4 %
Voltage Regulation Accuracy
1 %
Maximum Power Dissipation
0.362 W
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Reference Voltage
1.25 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Dropout (typical)
-
Current - Limit (min)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The MAX1857 low-dropout linear regulator operates
from a +2.5V to +5.5V supply and delivers a guaran-
teed 500mA load current with low 120mV dropout. The
high-accuracy (±1%) output voltage is preset at an
internally trimmed 4.75V or can be adjusted from 1.25V
to 5.0V with an external resistive divider.
An internal PMOS pass transistor allows the low 135µA
supply current to remain independent of load, making
this device ideal for portable battery-operated equip-
ment such as personal digital assistants (PDAs), cellu-
lar phones, cordless phones, base stations, and
notebook computers.
Other features include an active-low open-drain reset
output with a 4.5ms timeout period that indicates when
the output is out of regulation, a 0.1µA shutdown mode,
short-circuit protection, and thermal shutdown protec-
tion. The device is available in a miniature 8-pin µMAX
package. For higher power applications, refer to the
MAX1792 and MAX1793 data sheets.
19-1812; Rev 0; 1/01
________________________Applications
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
ON
V
IN
C
1µF
IN
= +5V
Notebook Computers
Cellular and Cordless Telephones
PDAs
Palmtop Computers
Base Stations
USB Hubs
Docking Stations
OFF
Typical Operating Circuit
IN
NC
IN
SHDN
SET
________________________________________________________________ Maxim Integrated Products
MAX1857
General Description
GND
OUT
OUT
RST
R
100k
RST
Ripple-Rejecting LDO in µMAX
V
OUT
C
3.3µF
OUT
= 4.75V
TO
µC
o Guaranteed 500mA Output Current
o Low 120mV Dropout at 500mA
o Up to ±1% Output Voltage Accuracy
o Reset Output with 4.5ms Timeout Period
o Low 135µA Ground Current
o 0.1µA Shutdown Current
o Thermal Overload Protection
o Output Current Limit
o Tiny µMAX Package
*Contact factory for other preset output voltages.
MAX1857EUA47
500mA, Low-Dropout,
TOP VIEW
Preset at 4.75V
Adjustable from 1.25V to 5.0V
PART*
SHDN
RST
IN
IN
1
2
4
3
Ordering Information
TEMP. RANGE
-40°C to +85°C
MAX1857
µMAX
Pin Configuration
6
8
7
5
OUT
OUT
SET
GND
PIN-PACKAGE
8 µMAX
Features
1

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MAX1857EUA47+ Summary of contents

Page 1

... MAX1857 ON SHDN RST OFF SET GND ________________________________________________________________ Maxim Integrated Products For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 500mA, Low-Dropout, Ripple-Rejecting LDO in µMAX o Guaranteed 500mA Output Current o Low 120mV Dropout at 500mA ±1% Output Voltage Accuracy Preset at 4 ...

Page 2

... SHUTDOWN Shutdown Supply Current I OFF V SHDN Input Threshold V SHDN Input Bias Current Dual Mode is a trademark of Maxim Integrated Products. 2 _______________________________________________________________________________________ Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C + 0.3V) IN Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C = 0° ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) = 4.75V, SHDN = IN, SET = GND, T ((V = +5.25V OUT PARAMETER SYMBOL RESET OUTPUT Reset Output Low Voltage Operating Voltage Range for Valid Reset RST Output High Leakage Current RST Threshold RST ...

Page 4

Low-Dropout, Ripple-Rejecting LDO in µMAX ELECTRICAL CHARACTERISTICS (continued) = 4.75V, SHDN = IN, SET = GND +5.25V OUT PARAMETER SYMBOL RESET OUTPUT Reset Output Low Voltage V Operating Voltage Range for Valid Reset RST ...

Page 5

SHDN = IN, SET = GND +5.25V OUT POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 0.01 0 FREQUENCY (kHz) LOAD-TRANSIENT RESPONSE NEAR DROPOUT 4.80V ...

Page 6

Low-Dropout, Ripple-Rejecting LDO in µMAX PIN NAME Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with a 1µF capacitor or greater GND (see Capacitor Selection and Regulator Stability). Connect both input pins ...

Page 7

Detailed Description The MAX1857 is a low-dropout, low-quiescent-current ripple rejector designed primarily for audio and video applications. The device supplies loads up to 500mA and is available with a preset output voltage of 4.75V. As shown in Figure 1, the ...

Page 8

Low-Dropout, Ripple-Rejecting LDO in µMAX shut down, RST is held low independent of the output voltage. If unused, leave RST grounded or unconnected. The MAX1857 monitors and controls the pass transis- tor’s gate voltage, limiting the output current to ...

Page 9

DC shift from the output impedance due to the load current change, and the transient response. A typical transient response for a step change in the load current from 5mA to 500mA is 18mV. ...

Page 10

... 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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