MAX6006_12 Datasheet, PDF (6/8 Pages) Maxim Integrated Products – 1μA SOT23 Precision Shunt Voltage Reference

MAX6006–MAX6009
1µA SOT23 Precision Shunt
Voltage Reference
PIN
SOT23
SO
1
6, 8
2
4
3
—
—
1, 2, 3, 5,
7
Pin Description
NAME
FUNCTION
OUT
GND
IC
Output Voltage. Bias OUT with a pullup resistor to a potential greater than OUT. Bypass
OUT to GND with a 0.01µF or larger capacitor.
Ground
Internally connected test point. Leave this pin unconnected, or connect to GND.
N.C.
No connection. Not internally connected.
Detailed Description
The MAX6006–MAX6009 are precision, two-terminal,
series bandgap voltage references. On-chip thin-film
resistors are laser trimmed to provide 0.2% output volt-
age accuracies. Voltages of +1.25V, +2.048V, +2.5V,
and +3.0V are available in the space-saving SOT23
package (2.1mm  2.7mm).
Applications Information
Output/Load Capacitance
For devices in this family, OUT needs to be bypassed
to GND with a 0.01µF or larger capacitor. In applica-
tions where the load or the supply can experience step
changes, additional capacitance will reduce the
amount of overshoot (or undershoot) and assist the cir-
cuit’s transient response.
Output Voltage Hysteresis
Output voltage hysteresis is the change in the output
voltage at T_A = +25°C before and after the device is
cycled over its entire operating temperature range.
Hysteresis is caused by differential package stress
appearing across the bandgap core transistors. The
temperature hysteresis value is typically less than
200ppm.
Turn-On Time
The output capacitance and bias current of the
MAX6006–MAX6009 greatly affects turn-on settling
time. In the Typical Operating Characteristics, turn-on
time is shown with a 10nF output capacitor and a 1.2µA
bias current. Under these conditions, the MAX6006–
MAX6009 settle in 40ms. Settling time will linearly
decrease in proportion to the circuit’s bias current.
Typical Applications
In the typical shunt regulator application shown in
Figure 1, R_BIAS is used to set the current through the
load (I_L) and the current through the shunt regulator
(I_RMIN). There are two worst-case situations that R_BIAS
needs to be sized for:
1) R_BIAS must be small enough that when V_S (supply
voltage) is at its minimum and I_L is at its maximum,
I_RMIN is equal to at least the minimum operating
current of the shunt regulator.
2) R_BIAS must be large enough that when V_S is at its
maximum and I_L is at its minimum, I_RMIN is < 2mA.
V_S
I_RMIN + I_L
R_BIAS
I_L
V_R
V_OUT
I_RMIN
MAX6006
MAX6007
MAX6008
MAX6009
R_BIAS
=
V_S
I_L +
- V_R
I_RMIN
Figure 1. Typical Application Circuit
6
Maxim Integrated