MAX6457UKD3B-T datasheet(9/15 Pages) MAXIM

Part #	MAX6457UKD3B-T

Description	High-Voltage, Low-Current Voltage Monitors in SOT Packages

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Manufacturer	MAXIM [Maxim Integrated Products]

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MAX6457–MAX6460

High-Voltage, Low-Current Voltage Monitors in

SOT Packages

9

Maxim Integrated

Hysteresis

Hysteresis adds noise immunity to the voltage monitors

and prevents oscillation due to repeated triggering

when VIN is near the threshold trip voltage. The hystere-

sis in a comparator creates two trip points: one for the

rising input voltage (VTH+) and one for the falling input

voltage (VTH-). These thresholds are shown in Figure 6.

The internal hysteresis options of the MAX6457/

MAX6458/MAX6459 are designed to eliminate the need

for adding an external hysteresis circuit.

Timeout Period

The timeout period (tTP) for the MAX6457 is the time

from when the input (IN+) crosses the rising input

threshold (VTH+) to when the output goes high (see

Figures 6 and 7). For the MAX6458, the monitored volt-

age must be in the “window” before the timeout starts.

The MAX6459 and MAX6460 do not offer the extended

timeout option (150ms). The extended timeout period is

suitable for overvoltage protection applications requir-

ing transient immunity to avoid false output assertion

due to noise spikes.

Latched-Output Operation

The MAX6457 features a digital latch input (CLEAR) to

latch any overvoltage event. If the voltage on IN+ (VIN+)

is below the internal threshold (VTH-), or if VCC is below

4V, OUT remains low regardless of the state of CLEAR.

Drive CLEAR high to latch OUT high when VIN+ exceeds

VTH+. When CLEAR is high, OUT does not deassert if

VIN+ drops back below VIN-. Toggle CLEAR to deassert

OUT. Drive CLEAR low to make the latch transparent

(Figure 7). CLEAR must be low when powering up the

MAX6457. To initiate self-clear at power-up, add a 100k

Ω

pullup resistor from CLEAR to VCC and a 1µF capacitor

from CLEAR to GND to hold CLEAR low. Connect

CLEAR to GND when not used. See Figure 9.

IN+

OUT

>VTH+

<VTH-

VCC

0

tTP

CLEAR

Figure 7. Timing Diagram (MAX6457)

5-CELL

Li+

BATTERY

STACK

BATTERY

CHARGER

DC-DC

CONVERTER

LOAD

R1

R2

RPULLUP

IN

OUT

+21V

VCC

GND

IN+

OUT

(OUTA FOR

MAX6459)

MAX6457–

MAX6460

SHDN

Figure 8. Undervoltage Lockout Typical Application Circuit

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