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MAX1857 Datasheet

500mA / Low-Dropout / Ripple-Rejecting LDO in MAX

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19-1812; Rev 0; 1/01
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
General Description
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.
Features
o Guaranteed 500mA Output Current
o Low 120mV Dropout at 500mA
o Up to ±1% Output Voltage Accuracy
Preset at 4.75V
Adjustable from 1.25V to 5.0V
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
________________________Applications
Notebook Computers
Cellular and Cordless Telephones
PDAs
Palmtop Computers
Base Stations
USB Hubs
Docking Stations
Ordering Information
PART*
MAX1857EUA47
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 µMAX
*Contact factory for other preset output voltages.
Typical Operating Circuit
VIN = +5V
CIN
1µF
NINC
IN
OUT
OUT
MAX1857
ON
SHDN
OFF
RST
SET GND
VOUT = 4.75V
COUT
3.3µF
RRST
100k
TO
µC
TOP VIEW
Pin Configuration
IN 1
IN 2
RST 3
SHDN 4
MAX1857
8 OUT
7 OUT
6 SET
5 GND
µMAX
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1857 Datasheet

500mA / Low-Dropout / Ripple-Rejecting LDO in MAX

No Preview Available !

500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, RST, SET to GND ....................................-0.3V to +6V
OUT to GND ................................................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +5.25V, VOUT = 4.75V, SHDN = IN, SET = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage
Input Undervoltage Lockout
Output Voltage Accuracy
(Preset Mode)
VIN
VUVLO
VOUT
Rising, 75mV hysteresis
IOUT = 100mA,
TA = +85°C
VOUT 2.5V
VOUT < 2.5V
IOUT = 100mA, TA = 0°C to +85°C
IOUT = 1mA to 500mA, VIN > VOUT + 0.5V,
TA = 0°C to +85°C
2.5 5.5
2.0 2.15 2.3
-1 +1
-1.5 +1.5
-2 +2
-3 +3
V
V
%
%
Adjustable Output Voltage
Range
VSET = 1.25V
1.25 5 V
SET Voltage Threshold
(Adjustable Mode)
Maximum Output Current
Short-Circuit Current Limit
In-Regulation Current Limit
SET Dual ModeThreshold
SET Input Bias Current
Ground-Pin Current
Dropout Voltage (Note 1)
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
Shutdown Supply Current
SHDN Input Threshold
SHDN Input Bias Current
VSET
IOUT
ILIM
VIN = +2.7V,
VOUT set to 2.0V,
IOUT = 100mA
TA = +85°C
TA = 0°C to +85°C
VIN 2.7V
VOUT = 0, VIN 2.7V
VOUT > 96% of nominal value, VIN 2.7V
ISET
IQ
VIN -
VOUT
VLNR
VLDR
VSET = 1.25V
IOUT = 1mA
IOUT = 500mA
IOUT = 500mA
VIN from (VOUT + 100mV) to 5.5V,
ILOAD = 5mA
IOUT = 1mA to 500mA
10Hz to 1MHz, COUT = 3.3µF (ESR < 0.1)
IOFF
SHDN = GND, VIN = 5.5V
VIH 2.5V < VIN < 5.5V
VIL 2.5V < VIN < 5.5V
SHDN = IN or GND
1.229
1.219
500
0.55
50
-100
1.250
1.2
2.0
100
135
175
1.271
1.281
2.2
150
+100
250
V
mARMS
A
A
mV
nA
µA
120 175
mV
-0.15 0 +0.15 %/V
0.4 1.0
%
115 µVRMS
0.1 15
µA
1.6
0.6 V
10 100 nA
Dual Mode is a trademark of Maxim Integrated Products.
2 _______________________________________________________________________________________


Part Number MAX1857
Description 500mA / Low-Dropout / Ripple-Rejecting LDO in MAX
Maker Maxim
Total Page 10 Pages
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