Datasheet

MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +5.25V, V
OUT
= 4.75V, SHDN = IN, SET = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
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 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
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
V
OUT
≥ 2.5V -1 +1
I
OUT
= 100mA,
T
A
= +85°C
V
OUT
< 2.5V
-1.5 +1.5
%
I
OUT
= 100mA, T
A
= 0°C to +85°C-2 +2
Output Voltage Accuracy
(Preset Mode)
V
OUT
I
OUT
= 1mA to 500mA, V
IN
> V
OUT + 0.5V,
T
A = 0°C to +85°C
-3 +3
%
Adjustable Output Voltage
Range
V
SET
= 1.25V
1.25
5V
T
A
= +85°C
1.229 1.250 1.271
SET Voltage Threshold
(Adjustable Mode)
V
SET
V
IN
= +2.7V,
V
OUT
set to 2.0V,
I
OUT
= 100mA
T
A
= 0°C to +85°C
1.219 1.281
V
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
1.2 2.2 A
In-Regulation Current Limit V
OUT
> 96% of nominal value, V
IN
≥ 2.7V 2.0 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 135 250
Ground-Pin Current I
Q
I
OUT
= 500mA 175
µA
Dropout Voltage (Note 1)
V
IN
-
V
OUT
I
OUT
= 500mA 120 175 mV
Line Regulation
∆V
LNR
V
IN
from (V
OUT
+ 100mV) to 5.5V,
I
LOAD
= 5mA
-0.15
0
+0.15
%/V
Load Regulation
∆V
LDR
I
OUT
= 1mA to 500mA 0.4 1.0 %
Output Voltage Noise 10Hz to 1MHz, C
OUT = 3.3µF (ESR < 0.1Ω)
115
µV
RMS
SHUTDOWN
Shutdown Supply Current I
OFF
SHDN = GND, V
IN
= 5.5V 0.1 15 µA
V
IH
2.5V < V
IN
< 5.5V 1.6
SHDN Input Threshold
V
IL
2.5V < V
IN
< 5.5V 0.6
V
SHDN Input Bias Current SHDN = IN or GND 10 100 nA
Dual Mode is a trademark of Maxim Integrated Products.