MAX1792.pdf
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19-1699; Rev 1; 8/08
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
Features
♦
Guaranteed 500mA Output Current
♦
Low 130mV Dropout at 500mA
♦
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
♦
Reset Output with 4ms Timeout Period
♦
Low 80µA Ground Current
♦
0.1µA Shutdown Current
♦
Thermal Overload Protection
♦
Output Current Limit
♦
Tiny 1.3W Power-µMAX Package
Ordering Information
PART*
TEMP RANGE
PIN-PACKAGE
MAX
*Insert the desired two-digit suffix (see Selector Guide) into the
blanks to complete the part number.
Contact factory for other preset output voltages.
MAX1792EUA_ _
-40
°
C to +85
°
C
8 Power-
μ
Selector Guide
MAX
TOP MARK
μ
PART AND
SUFFIX
V
OUT
MAX1792EUA15
1.5V or Adj.
AAAE
MAX1792EUA18
1.8V or Adj.
AAAA
MAX1792EUA25
2.5V or Adj.
AAAB
MAX1792EUA33
3.3V or Adj.
AAAC
MAX1792EUA50
5.0V or Adj.
AAAD
Typical Operating Circuit
Pin Configuration
TOP VIEW
V
IN
= +2.5V TO +5.5V
IN
V
OUT
OUT
NC
C
IN
1
C
OUT
3.3
IN
OUT
IN
1
8
OUT
μ
F
μ
F
IN
2
7
OUT
R
RST
100k
MAX1792
MAX1792
RST
3
6
SET
ON
TO
μ
SHDN
RST
SHDN
4
5
GND
C
OFF
POWER-
μ
MAX
SET
GND
________________________________________________________________
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.
500mA Low-Dropout
Linear Regulator in µMAX
ABSOLUTE MAXIMUM RATINGS
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
IN, SHDN, RST, SET to GND ....................................-0.3V to +6V
OUT to GND ................................................-0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Power-µMAX (derate 17mW/°C above +70°C) .......1.3W
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
(V
IN
= V
OUT(NOM)
+ 500mV, or V
IN
= +2.5V (whichever is greater),
SHDN = IN,
T
A
= 0°C to +85°C
, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage
V
IN
2.5
5.5
V
Input Undervoltage Lockout
V
UVLO
Rising, 75mV hysteresis
2.0
2.15
2.3
V
Preset V
OUT
≥
2.5V
-1
+1
I
OUT
= 100mA,
T
A
= +85
%
°
C
Preset V
OUT
< 2.5V
-1.5
+1.5
Output Voltage Accuracy
(Preset Mode)
V
OUT
I
OUT
= 100mA, T
A
= 0
°
C to +85
°
C
-2
+2
%
I
OUT
= 1mA to 500mA, V
IN
> V
OUT
+ 0.5V,
T
A
= 0
-3
+3
°
C to +85
°
C
Adjustable Output Voltage
Range
1.25
5
V
V
IN
= +2.7V,
V
OUT
set to 2.0V,
I
OUT
= 100mA
T
A
= +85
C
1.229
1.250
1.271
°
SET Voltage Threshold
(Adjustable Mode)
V
SET
V
T
A
= 0
°
C to +85
°
C
1.219
1.281
Maximum Output Current
I
OUT
V
IN
≥
2.7V
500
mA
RMS
Short-Circuit Current Limit
I
LIM
V
OUT
= 0, V
IN
≥
2.7V
0.55
0.8
1.8
A
In-Regulation Current Limit
V
OUT
> 96% of nominal value, V
IN
≥
2.7V
1.6
A
SET Dual Mode™ Threshold
50
100
150
mV
SET Input Bias Current
I
SET
V
SET
= 1.25V
-100
+100
nA
I
OUT
= 1mA
80
250
Ground-Pin Current
I
Q
μ
A
I
OUT
= 500mA
110
V
OUT
= 5.0V
120
225
V
IN
-
V
OUT
Dropout Voltage (Note 1)
I
OUT
= 500mA
V
OUT
= 3.3V
130
250
mV
V
OUT
= 2.5V
210
360
V
IN
from (V
OUT
+ 100mV) to 5.5V,
I
LOAD
= 5mA
Line Regulation
Δ
V
LNR
-0.15
0
+0.15
%/V
Load Regulation
Δ
V
LDR
I
OUT
= 1mA to 500mA
0.4
1.0
%
Output Voltage Noise
10Hz to 1MHz, C
OUT
= 3.3
115
μ
V
RMS
F (ESR < 0.1
)
μ
Ω
SHUTDOWN
Shutdown Supply Current
I
OFF
SHDN = GND, V
IN
= 5.5V
0.1
15
μ
A
V
IH
2.5V < V
IN
< 5.5V
1.6
SHDN Input Threshold
V
V
IL
2.5V < V
IN
< 5.5V
0.6
SHDN Input Bias Current
SHDN = IN or GND
10
100
nA
Dual Mode is a trademark of Maxim Integrated Products.
2
_______________________________________________________________________________________
500mA Low-Dropout
Linear Regulator in µMAX
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
OUT(NOM)
+ 500mV, or V
IN
= +2.5V (whichever is greater), SHDN = IN,
T
A
= 0°C to +85°C
, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RESET OUTPUT
Reset Output Low Voltage
V
OL
RST sinking 1mA
0.01
0.1
V
Operating Voltage Range for
Valid Reset
RST sinking 100
μ
A
1.0
5.5
V
RST Output High Leakage
Current
V
RST
= +5.5V
100
nA
RST Threshold
Rising edge, referred to V
OUT(NOMINAL)
90
93
96
%
RST Release Delay
t
RP
Rising edge of OUT to rising edge of RST
1.5
4.5
8
ms
THERMAL PROTECTION
Thermal Shutdown Temperature
T
SHDN
170
°
C
Thermal Shutdown Hysteresis
Δ
T
SHDN
20
°
C
ELECTRICAL CHARACTERISTICS
(V
IN
= V
OUT(NOM)
+ 500mV, or V
IN
= +2.5V (whichever is greater), SHDN = IN,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
Input Voltage
V
IN
2.5
5.5
V
Input Undervoltage Lockout
V
UVLO
Rising or falling
2.0
2.3
V
I
OUT
= 100mA
-2
+2
Output Voltage Accuracy
(Preset Mode)
V
OUT
%
I
OUT
= 1mA to 500mA
-3
+3
Adjustable Output Voltage
Range
1.25
5
V
SET Voltage Threshold
(Adjustable Mode)
V
SET
I
OUT
= 100mA
1.212
1.288
V
Maximum Output Current
I
OUT
500
mA
RMS
Short-Circuit Current Limit
I
LIM
V
OUT
= 0
0.55
1.8
A
SET Dual Mode Threshold
50
150
mV
SET Input Bias Current
I
SET
V
SET
= 1.25V
-100
+100
nA
Ground-Pin Current
I
Q
I
OUT
= 1mA
250
μ
A
V
OUT
= 5.0V
225
V
IN
-
V
OUT
Dropout Voltage (Note 1)
I
OUT
= 500mA
V
OUT
= 3.3V
250
mV
V
OUT
= 2.5V
360
V
IN
from (V
OUT
+ 100mV) to 5.5V,
I
LOAD
= 5mA
Line Regulation
Δ
V
LNR
-0.15
+0.15
%/V
Load Regulation
V
LDR
I
OUT
= 1mA to 500mA
1.0
%
Δ
SHUTDOWN
Shutdown Supply Current
SHDN = GND, V
IN
= +5.5V
I
OFF
15
μ
A
V
IH
2.5V < V
IN
< 5.5V
1.6
SHDN Input
Threshold
V
V
IL
2.5V < V
IN
< 5.5V
0.6
SHDN Input Bias Current
I
SHDN
SHDN = IN or GND
100
nA
_______________________________________________________________________________________
3
500mA Low-Dropout
Linear Regulator in µMAX
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
OUT(NOM)
+ 500mV, or V
IN
= +2.5V (whichever is greater), SHDN = IN,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
RESET OUTPUT
Reset Output Low Voltage
V
OL
RST sinking 1mA
0.1
V
Operating Voltage Range for
Valid Reset
RST sinking 100
μ
A
1.0
5.5
V
V
RST
= +5.5V
RST Output High Leakage
Current
100
nA
RST Threshold
Rising edge, referred to V
OUT(NOMINAL)
90
96
%
RST Release Delay
t
RP
Rising edge of OUT to rising edge of RST
1.5
8
ms
Note 1:
Dropout voltage is defined as V
IN
- V
OUT
, when V
OUT
is 100mV below the value of V
OUT
measured when V
IN
= V
OUT(NOM)
+ 0.5V. Since the minimum input voltage is 2.5V, this specification is only meaningful when V
OUT(NOM)
2.5V. For V
OUT(NOM)
between 2.5V and 3.5V, use the following equations: Typical Dropout = -93mV/V
✕
V
OUT(NOM)
+ 445mV; Guaranteed Maximum
Dropout = -137mV/V
✕
≥
V
OUT(NOM)
+ 704mV. For V
OUT(NOM)
≥
3.5V: Typical Dropout = 120mV; Guaranteed Maximum Dropout
= 225mV.
Note 2:
Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(MAX1792EUA33, V
IN
= V
OUT
+ 500mV, SHDN = IN, C
IN
= 1µF, C
OUT
= 3.3µF, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
OUTPUT VOLTAGE
vs. TEMPERATURE
OUTPUT VOLTAGE
vs. LOAD CURRENT
3.5
3.33
3.33
V
IN
= V
OUT
+ 500mV
I
OUT
= 0
I
OUT
= 0
3.0
3.32
3.32
2.5
I
OUT
= 500mA
3.31
3.31
2.0
3.30
3.30
1.5
3.29
3.29
1.0
3.28
3.28
0.5
0
3.27
3.27
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
10
35
60
85
0
100
200
300
400
500
600
700
800
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
GROUND-PIN CURRENT
vs. LOAD CURRENT
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
140
250
140
I
OUT
= 500mA
130
T
A
= +85
°
C
120
V
IN
= 5.5V
200
120
100
110
150
T
A
= +25
°
C
V
IN
= 3.8V
80
I
OUT
= 0
100
60
100
90
T
A
= -40
°
C
40
80
50
20
70
0
0
60
0
100
200
300
400
500
600
700
800
0
0.5
1.0 1.5 2.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
0
100
200
300
400
500
600
700
800
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
4
_______________________________________________________________________________________
500mA Low-Dropout
Linear Regulator in µMAX
Typical Operating Characteristics (continued)
(MAX1792EUA33, V
IN
= V
OUT
+ 500mV, SHDN = IN, C
IN
= 1µF, C
OUT
= 3.3µF, T
A
= +25°C, unless otherwise noted.)
GROUND-PIN CURRENT
vs. TEMPERATURE
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
95
-80
V
IN
= V
OUT
+ 500 mV
I
OUT
= 0
C
OUT
= 3.3
F
I
OUT
= 50mA
μ
-70
90
-60
85
-50
80
-40
75
-30
70
-20
65
-10
60
0
-40
-15
10
35
60
85
0.01
0.1
1
10
100
1000
TEMPERATURE (
°
C)
FREQUENCY (kHz)
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
OUTPUT NOISE DC TO 1MHz
10
C
OUT
= 3.3
μ
F
I
OUT
= 50mA
1
V
OUT
200
μ
V/div
0.1
0.01
V
OUT
= 3.3V
R
OUT
= 66
Ω
(50mA)
0.001
0.1
1
10
100
1000
20ms/div
FREQUENCY (kHz)
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
LOAD-TRANSIENT RESPONS
MAX1792-12
100
I
OUT
500mA/div
10
C
OUT
= 3.3
μ
F
1
V
OUT
20mV/div
C
OUT
= 10
μ
F
STABLE REGION
0.1
V
IN
= V
OUT
+ 500mV
C
IN
= 10
μ
F
R
OUT
= 660
Ω
TO 6.6
Ω
(5mA TO 500mA)
0.01
700
800
10
μ
s/div
0
100
200
300
400
500
600
LOAD CURRENT (mA)
_______________________________________________________________________________________
5
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