Datasheet

4.64
4.68
4.76
4.72
4.80
0 200 400 600 800 1000
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX1857 toc01
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
V
IN
= 5.25V
V
IN
= 5.00V
4.70
4.72
4.76
4.74
4.78
4.80
-55 5-25 35 65 95 125
OUTPUT VOLTAGE vs. TEMPERATURE
MAX1857 toc02
TEMPERATURE (
°
C)
OUTPUT VOLTAGE (V)
I
OUT
= 0mA
0
150
100
50
200
250
300
0 400200 600 800 1000
DROPOUT VOLTAGE
vs. OUTPUT CURRENT
MAX1857 toc03
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE (mV)
T
A
= +25
°
C
T
A
= -40
°
C
T
A
= +85
°
C
Typical Operating Characteristics
(V
IN
= +5.25V, V
OUT
= 4.75V, SHDN = IN, SET = GND, C
IN
= 1µF, C
OUT
= 3.3µF, T
A
= +25°C, unless otherwise noted.)
MAX1857
500mA, Low-Dropout,
Ripple-Rejecting LDO in µMAX
4 _______________________________________________________________________________________
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 100µA 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)
83 89 %
RST Release Delay t
RP
Rising edge of OUT to rising edge of RST 1.4 8 ms
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +5.25V, V
OUT
= 4.75V, SHDN = IN, SET = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
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
= 175mV.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.