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MAX6330LUR+T-MAX6330SUR+-MAX6330TUR+
Precision Shunt Regulators with Reset in SOT23-3
General DescriptionThe MAX6330/MAX6331 combine a precision shunt regu-
lator with a power-on reset function in a single SOT23-3
package. They offer a low-cost method of operating small
microprocessor (µP)-based systems from high-voltage
sources, while simultaneously protecting µPs from power-
up, power-down, and brownout conditions.
Both active-low (MAX6330) and active-high (MAX6331)
push/pull output versions are available. The output
voltage has ±1.5% tolerance. The MAX6330/MAX6331
operate over a wide shunt current range from 100µA to
50mA, and offer very good transient immunity.
A 3-pin SOT23 package allows for a significant reduc-
tion in board space and improves reliability compared
to multiple-IC/discrete solutions. These devices have a
minimum order increment of 2,500 pieces.
Applications●Controllers●Household Appliances●Intelligent Instruments●Critical µP and µC Power Monitoring●Portable/Size-Sensitive Equipment
Features●100µA to 50mA Shunt Current Range●Low Cost●3-Pin SOT23 Package●±1.5% Tolerance on Output Voltage ●Three Shunt Voltages Available: 5V, 3.3V, 3.0V●Precision Power-On Reset Threshold: 1.5% Tolerance Available with Either RESET (MAX6331) or RESET (MAX6330)
Outputs●140ms Reset Timeout Period—No External
Components Required
*Insert the desired suffix letter (from the table below) into the
blank to complete the part number. These devices have a mini-
mum order increment of 2,500 pieces.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
PART*TEMP RANGEPIN-PACKAGE
MAX6330_UR-T-40°C to +85°C3 SOT23-3
MAX6331_UR-T-40°C to +85°C3 SOT23-3
SUFFIX
RESET
THRESHOLD
(V)
SHUNT
REGULATOR
VOLTAGE
(V)
SOT
TOP MARK
MAX6330MAX63314.635.0EKAAELAA3.063.3EMAAENAA2.783.0EDAAEPAA
TOP VIEW
RESET
(RESET)GND
( ) ARE FOR THE MAX6331
SHUNT
MAX6330
MAX6331
SOT23-3MAX6330
MAX6331
SHUNT
VSHUNT
ISHUNT
ILOADVIN
RESET
(RESET)
RESET
INPUT
GND
VCC
CL
0.1µF*
GND
*SEE THE SECTION CHOOSING THE BYPASS CAPACITOR (CL)
IIN
MAX6330/MAX6331Precision Shunt Regulators with
Reset in SOT23-3
Pin Coniguration
Ordering Information
Typical Operating Circuit
Terminal Voltage (with respect to GND),All Pins Except SHUNT ..................-0.3V to (VSHUNT + 0.3V)
Input Current (ISHUNT) .......................................................60mA
Output Current (RESET/RESET) .......................................20mA
Short-Circuit Duration ................................................Continuous
Continuous Power DissipationSOT23-3 (derate 4mW/°C above +70°C) ....................320mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
(ISHUNT = 1mA, CL = 0.1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVSHUNT Regulation
Voltage (Note 1)VSHUNT
ISHUNT =
0.1mA
to 50mA
MAX633_LTA = +25°C4.935.05.07
TA = -40°C to +85°C4.855.15
MAX633_T
TA = +25°C3.253.33.35
TA = -40°C to +85°C3.203.40
MAX633_S
TA = +25°C2.963.03.04
TA = -40°C to +85°C2.913.09
Minimum VSHUNT for which
RESET is Valid (MAX6330)
TA = 0°C to +70°C1.0VTA = -40°C to +85°C1.2
VSHUNT Tempco40ppm/°C
Minimum Shunt Current
(Note 2)
ISHUNT(min)10060µA
Maximum Shunt Current
(Note 3)
ISHUNT(max)50mA
Reset Threshold VoltageVTH
MAX633_LTA = +25°C4.564.634.69
TA = -40°C to +85°C4.504.75
MAX633_T
TA = +25°C3.013.063.11
TA = -40°C to +85°C2.973.15
MAX633_STA = +25°C2.742.782.82
TA = -40°C to +85°C2.702.86
Reset Threshold Tempco40ppm/°C
VSHUNT to Reset Delay100mV overdrive, CL = 15pF20µs
Reset Pulse Width100140200ms
MAX6330/MAX6331Precision Shunt Regulators with
Reset in SOT23-3
Electrical CharacteristicsStresses 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.
Absolute Maximum Ratings
(ISHUNT = 1mA, CL = 0.1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
RESET/RESET Output
Voltage Low (Note 4)VOL
ISINK = 3.2mAMAX6330L, VTH(min)0.4
MAX6331L, VTH(max)
ISINK = 1.2mA
MAX6330T/S, VTH(min)
0.3MAX6331T/S, VTH(max)
MAX6330, VSHUNT = 1V, ISINK =
50µA, TA = 0°C to +70°C0.3
MAX6330, VSHUNT = 1.2V, ISINK =
50µA, TA = -40°C to +85°C0.3
RESET/RESET Output
Voltage High (Note 4)VOH
ISOURCE = 800µAMAX6331L, VTH(min)0.8 x VSHUNT
MAX6330L, VTH(max)
ISOURCE = 500µAMAX6331T/S, VTH(min)0.8 x VSHUNTMAX6330T/S, VTH(max)
MAX6331, 1.8V < VSHUNT < VTH(min),
ISOURCE = 150µA0.8 x VSHUNT
Note 1: It is recommended that the regulation voltage be measured using a 4-wire force-sense technique when operating at high
shunt currents. For operating at elevated temperatures, the device must be derated based on a +150°C maximum allowed
junction temperature and a maximum thermal resistance of 0.25°C/mW junction to ambient when soldered on a printed cir-
cuit board. The TA = +25°C specification over load is measured using a pulse test at 50mA with less than 5ms on time.
Note 2: Minimum shunt current required for regulated VSHUNT.
Note 3: Maximum shunt current required for regulated VSHUNT.
Note 4: In a typical application where SHUNT serves as the system voltage regulator, note that both ISOURCE for VOH and ISINK
for VOL come from VSHUNT (see the Typical Operating Circuit).
MAX6330/MAX6331Precision Shunt Regulators with
Reset in SOT23-3
Electrical Characteristics (continued)
(Typical Operating Circuit, CL = 0.1µF, ILOAD = 0mA, TA = +25°C, unless otherwise noted.)
VIN
50V/div
VSHUNT
2V/div
START-UP TRANSIENTMAX6330 TOC07
RS = 15kΩ
STABILITY BOUNDARY CONDITIONS
MAX6330 TOC06
LOAD CAPACITANCE (µF)
SHUNT CURRENT (mA)
UNSTABLE REGION
RECOMMENDED
CAPACITOR
OPERATING
REGION
RECOMMENDED
CAPACITANCE
RECOMMENDED
CAPACITORSHUNT VOLTAGE OVERSHOOT
vs. BYPASS CAPACITANCE (CL)
MAX6330 TOC5
LOAD CAPACITANCE (µF)
SHUNT VOLTAGE OVERSHOOT (mV)
ISHUNT = 5mA TO 50mA
ISHUNT = 0.1mA TO 5mA
ISHUNT = 1mA TO 1mA
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX6330 TOC04
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAX6330 TOC03
TEMPERATURE (°C)
POWER-UP RESET TIMEOUT (ms)
NORMALIZED SHUNT VOLTAGE
vs. TEMPERATURE
MAX6330 TOC02
TEMPERATURE (°C)
NORMALIZED SHUNT VOLTAGE
ISHUNT = 50mA
ISHUNT = 25mA
ISHUNT = 1mA
NORMALIZED SHUNT VOLTAGE
vs. SHUNT CURRENT
MAX6330 TOC01
SHUNT CURRENT (mA)
NORMALIZED SHUNT VOLTAGE
TA = +85°C
TA = -40°C
TA = +25°C
MAX6330/MAX6331Precision Shunt Regulators with
Reset in SOT23-3
Typical Operating Characteristics
Detailed Description
Reset OutputA microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6330/MAX6331 µP supervisory cir-
cuits assert reset to prevent code-execution errors during
power-up, power-down, or brownout conditions.
RESET is guaranteed to be a logic low for VSHUNT > 1V.
Once VSHUNT exceeds the reset threshold, an internal
timer keeps RESET low for the reset timeout period; after
this interval, RESET goes high.
If a brownout condition occurs (VSHUNT dips below the
reset threshold), RESET goes low. When VSHUNT falls
below the reset threshold, the internal timer resets to
zero and RESET goes low. The internal timer starts after
VSHUNT returns above the reset threshold, and RESET
then remains low for the reset timeout period.
The MAX6331 has an active-high RESET output that is
the inverse of the MAX6330’s RESET output.
Shunt RegulatorThe shunt regulator consists of a pass device and a
controlling circuit, as illustrated in Figure 1. The pass
device allows the regulator to sink current while regu-
lating the desired output voltage within a ±1.5% toler-
ance. The shunt current range (ISHUNT) is 100µA to
50mA.
The pass transistor in the MAX6330/MAX6331 maintains
a constant output voltage (VSHUNT) by sinking the neces-
sary amount of shunt current. When ILOAD (see Typical
Operating Circuit) is at a maximum, the shunt current is
at a minimum, and vice versa:
IIN = ISHUNT + ILOAD = (VIN - VSHUNT) / RS
Consider the following information when choosing the
external resistor RS:
1) The input voltage range, (VIN)
2) The regulated voltage, (VSHUNT)
3) The output current range, (ILOAD)
Choose RS as follows:
(VIN(max) - VSHUNT (min)) / (50mA + ILOAD(min)) ≤ RS ≤
(VIN(min) - VSHUNT (max)) / (100µA + ILOAD(max))
Choose the largest nominal resistor value for RS that
gives the lowest current consumption. Provide a safety
margin to incorporate the worst-case tolerance of the
Figure 1. Functional Diagram
PINNAMEFUNCTIONMAX6330MAX63311GNDGround—RESETInverting Reset Output. RESET remains low while VSHUNT is below the reset threshold and
for 140ms after VSHUNT rises above the threshold.2RESETNoninverting Reset Output. RESET remains high while VSHUNT is below the reset threshold
and for 140ms after VSHUNT rises above the threshold.3SHUNTRegulated Shunt Voltage (+5V, +3.3V, or +3.0V)
MAX6330
MAX6331
VINVSHUNTILOAD
ISHUNT
IIN
SHUNT
RESET
GENERATOR
140ms
TIMEOUT
RESET
(RESET)
1.2V
GND
( ) ARE FOR MAX6331
MAX6330/MAX6331Precision Shunt Regulators with
Reset in SOT23-3
Pin Description
resistor used. Ensure that the resistor’s power rating is
adequate, using the following general power equation:
PR = IIN(VIN(max) - VSHUNT)
= I2INRS
= (VIN(max) - VSHUNT)2 / RS
Applications Information
Negative-Going VSHUNT TransientsIn addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX6330/
MAX6331 are relatively immune to short-duration neg-
ative-going VSHUNT transients (glitches). Additional
bypass filter capacitance mounted close to the SHUNT
pin provides additional transient immunity.
Choosing the Bypass Capacitor, CLThe bypass capacitor (CL) on the SHUNT pin can sig-
nificantly affect the device’s load-transient response, so
choose it carefully. When a load transient occurs, the
current for this load is diverted from the shunt regulator.
The maximum load current that can be diverted from the
regulator is:
ILOAD (diverted from regulator)
= ISHUNT(max) - ISHUNT(min)
= 50mA - 100µA
= 49.9mA
The shunt regulator has a finite response to this tran-
sient. The instantaneous requirements of the load
change are met by the charge on CL, resulting in over-
shoot/undershoot on VSHUNT. The magnitude of this
overshoot/undershoot increases with ISHUNT and
decreases with CL. When VSHUNT undershoots, the
shunt current decreases to where it will only draw qui-
escent current (IQ), and the shunt element turns off. At
this point, VSHUNT will slew toward VIN at the following
rate:∆VSHUNT / ∆t = (IIN - ILOAD - 60µA) / CL
As VSHUNT rises, it will turn on the shunt regulator when
it can sink 100µA of current. A finite response time for
the shunt regulator to start up will result in a brief over-
shoot of VSHUNT before it settles into its regulation
voltage. Therefore, ILOAD should always be 100µA or
more below IIN, or VSHUNT will not recover to its regu-
lation point. To prevent this condition, be sure to select
the correct series-resistor RS value (see the Shunt
Regulator section).
Figures 2, 3, and 4 show load-transient responses for
different choices of bypass capacitors on VSHUNT.
These photos clearly illustrate the benefits and draw-
Figure 3. Load-Transient Response with CL = 0.033µF
Figure 2. Load-Transient Response with CL = 0.22µF
ILOAD
2mA/div
VSHUNT
20mV/div
MAX6330 FIG 04
IIN = 2mA, ILOAD = 0 to 1.9mA
VSHUNT IS AC COUPLED
ILOAD
2mA/div
VSHUNT
20mV/div
MAX6330 FIG 03
IIN = 2mA, ILOAD = 0 to 1.9mA,
VSHUNT IS AC COUPLED
ILOAD
2mA/div
VSHUNT
20mV/div
MAX6330 FIG 02
IIN = 2mA, ILOAD = 0 to 1.9mA
VSHUNT IS AC COUPLED
MAX6330/MAX6331Precision Shunt Regulators with
Reset in SOT23-3
