MAX1792 반도체 회로 부품 판매점
500mA Low-Dropout Linear Regulator in MAX
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 Maxim Integrated |
19-1699; Rev 0; 9/00
500mA Low-Dropout
Linear Regulator in µMAX
General Description
The MAX1792 low-dropout linear regulator operates
from a +2.5V to +5.5V supply and delivers a guaran-
teed 500mA load current with low 130mV dropout. The
high-accuracy (±1%) output voltage is preset at an
internally trimmed voltage (see Selector Guide) or can
be adjusted from 1.25V to 5.0V with an external resis-
tive divider.
An internal PMOS pass transistor allows the low 80µA
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 4ms 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 1.3W, 8-pin
power-µMAX package with a metal pad on the under-
side of the package.
________________________Applications
Notebook Computers
Cellular and Cordless Telephones
Personal Digital Assistants (PDAs)
Palmtop Computers
Base Stations
USB Hubs
Docking Stations
Typical Operating Circuit
VIN = +2.5V TO +5.5V
CIN
1µF
NINC
IN
OUT
OUT
MAX1792
ON
SHDN
OFF
RST
SET GND
VOUT
COUT
3.3µF
RRST
100k
TO
µC
Features
o Guaranteed 500mA Output Current
o Low 130mV Dropout at 500mA
o Up to ±1% Output Voltage Accuracy
Preset at 1.5V, 1.8V, 2.5V, 3.3V, or 5.0V
Adjustable from 1.25V to 5.0V
o Reset Output with 4ms Timeout Period
o Low 80µA Ground Current
o 0.1µA Shutdown Current
o Thermal Overload Protection
o Output Current Limit
o Tiny 1.3W Power-µMAX Package
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX1792EUA_ _
-40°C to +85°C 8 Power-µMAX
*Insert the desired two-digit suffix (see Selector Guide) into the
blanks to complete the part number.
Contact factory for other preset output voltages.
Selector Guide
PART AND
SUFFIX
MAX1792EUA15
MAX1792EUA18
MAX1792EUA25
MAX1792EUA33
MAX1792EUA50
VOUT
1.5V or Adj.
1.8V or Adj.
2.5V or Adj.
3.3V or Adj.
5.0V or Adj.
µMAX
TOP MARK
AAAE
AAAA
AAAB
AAAC
AAAD
Pin Configuration
TOP VIEW
IN 1
IN 2
RST 3
SHDN 4
MAX1792
8 OUT
7 OUT
6 SET
5 GND
POWER-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.
500mA Low-Dropout
Linear Regulator 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 Power-µMAX (derate 17mW/°C above +70°C) .......1.3W
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 = VOUT(NOM) + 500mV, or VIN = +2.5V (whichever is greater), SHDN = IN, 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 2.5 5.5
VUVLO Rising, 75mV hysteresis
2.0 2.15 2.3
IOUT = 100mA,
TA = +85°C
Preset VOUT ≥ 2.5V
Preset VOUT < 2.5V
-1
-1.5
+1
+1.5
VOUT IOUT = 100mA, TA = 0°C to +85°C
-2
+2
IOUT = 1mA to 500mA, VIN > VOUT + 0.5V,
TA = 0°C to +85°C
-3
+3
V
V
%
%
Adjustable Output Voltage
Range
1.25 5 V
SET Voltage Threshold
(Adjustable Mode)
VSET
VIN = +2.7V,
VOUT set to 2.0V,
IOUT = 100mA
TA = +85°C
TA = 0°C to +85°C
1.229 1.250
1.219
Maximum Output Current
Short-Circuit Current Limit
In-Regulation Current Limit
SET Dual Mode™ Threshold
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
IOUT
ILIM
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
VOUT = 5.0V
IOUT = 500mA
VOUT = 3.3V
VOUT = 2.5V
VIN from (VOUT + 100mV) to 5.5V,
ILOAD = 5mA
IOUT = 1mA to 500mA
10Hz to 1MHz, COUT = 3.3µF (ESR < 0.1Ω)
IOFF
SHDN = GND, VIN = 5.5V
VIH 2.5V < VIN < 5.5V
VIL 2.5V < VIN < 5.5V
SHDN = IN or GND
500
0.55
50
-100
-0.15
0.8
1.6
100
80
110
120
130
210
0
0.4
115
0.1
1.6
10
Dual Mode is a trademark of Maxim Integrated Products.
2 _______________________________________________________________________________________
1.271
1.281
1.8
150
+100
250
225
250
360
+0.15
1.0
15
0.6
100
V
mARMS
A
A
mV
nA
µA
mV
%/V
%
µVRMS
µA
V
nA
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MAX1792 regulator
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