Datasheet

MAX6018
Precision, Micropower, 1.8V Supply,
Low-Dropout, SOT23 Voltage Reference
8 _______________________________________________________________________________________
Detailed Description
The MAX6018 is a precision, low-voltage, low-dropout,
micropower, bandgap voltage reference in a SOT23
package. This three-terminal reference operates with
an input voltage from (V
OUT
+ 200mV) to 5.5V, and is
available with output voltage options of 1.2V, 1.6V,
1.8V, and 2.048V. These devices can source up to 1mA
with <200mV of dropout voltage, making them attrac-
tive for use in low-voltage applications.
Applications Information
Output/Load Capacitance
These devices require a minimum of 100pF load to
maintain output stability.
They remain stable for capacitive loads as high as 1µF.
In applications where the load or the supply can experi-
ence step changes, a larger output capacitor reduces
the amount of overshoot (or undershoot) and assists
the circuit’s transient response. Otherwise, applications
may not need more than 100pF.
Supply Current
The 5µA maximum supply current varies only 0.1µA/V
with the supply voltage.
When the supply voltage is below the minimum-speci-
fied input voltage (as during turn-on), the devices can
draw up to 20µA beyond the nominal supply current.
The input voltage source must be capable of providing
this current to ensure reliable turn-on.
Turn-On Time
These devices typically turn on and settle to within
0.1% of their final value in 200µs. The turn-on time can
increase up to 1ms with the device operating at the
minimum dropout voltage and the maximum load.
Chip Information
TRANSISTOR COUNT: 87
PROCESS: BiCMOS
PIN
NAME
FUNCTION
1IN
Supply Voltage Input. Bypass with a 0.1µF
capacitor to ground.
2
OUT
Reference Voltage Output. Bypass with at
least 100pF to ground. (See Output/Load
Capacitance section).
3
GND
Ground
Pin Description
I
OUT
1mA/div
+1mA
-1mA
V
OUT
1V/div
MAX6018_21
LOAD-TRANSIENT RESPONSE
MAX6018 toc19
100µs/div
C
OUT
= 150pF
MAX6018_12
LINE-TRANSIENT RESPONSE
MAX6018 toc20
V
OUT
50mV/div
V
IN
200mV/div
100µs/div
C
OUT
= 550pF
V
IN
200mV/div
V
OUT
50mV/div
MAX6018_21
LINE-TRANSIENT RESPONSE
MAX6018 toc21
100µs/div
C
OUT
= 550pF
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)