Datasheet

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General Description

The MAX834/MAX835 micropower voltage monitors

contain a 1.204V precision bandgap reference, com-

parator, and latched output in a 5-pin SOT23 package.

Using the latched output prevents deep discharge of

batteries. The MAX834 has an open-drain, n-channel

output driver, while the MAX835 has a push-pull output

driver. Two external resistors set the trip-threshold

voltage.

The MAX834/MAX835 feature a level-sensitive latch,

eliminating the need to add hysteresis to prevent oscil-

lations in battery-load-disconnect applications.

Applications

Precision Battery Monitors

Load Switching

Battery-Powered Systems

Threshold Detectors

Features

♦ Prevent Deep Discharge of Batteries

♦ Precision ±1.25% Voltage Threshold

♦ Latched Output (Once Low, Stays Low Until

Cleared)

♦ SOT23-5 Package

♦ Low Cost

♦ +2.5V to +11V Wide Operating Voltage Range

♦ < 2µA Typical Supply Current

♦ Open-Drain Output (MAX834)/Push-Pull Output

(MAX835)

MAX834/MAX835

Micropower, Latching Voltage Monitors

in SOT23-5

________________________________________________________________ Maxim Integrated Products 1

GND

OUT

CLEAR

MAX834

MAX835

SOT23-5

TOP VIEW

Pin Configuration

GND

R20.1μF

CLEAR LATCH

(MAX834

ONLY)

CLEAR

MAX834

MAX835

OUT OUT

Typical Operating Circuit

19-1157; Rev 3; 3/10

Ordering Information

Note: All devices are specified over the -40°C to +85°C operating

temperature range.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by changing “-T” with “+T” when ordering.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART PIN-PACKAGE TOP MARK

MAX834E U K- T

5 SOT23 AAAX

MAX835E U K- T

5 SOT23 AAAY

Summary of content (9 pages)

PAGE 1
9-1157; Rev 3; 3/10 Micropower, Latching Voltage Monitors in SOT23-5 The MAX834/MAX835 micropower voltage monitors contain a 1.204V precision bandgap reference, comparator, and latched output in a 5-pin SOT23 package. Using the latched output prevents deep discharge of batteries. The MAX834 has an open-drain, n-channel output driver, while the MAX835 has a push-pull output driver. Two external resistors set the trip-threshold voltage.
PAGE 2
MAX834/MAX835 Micropower, Latching Voltage Monitors in SOT23-5 ABSOLUTE MAXIMUM RATINGS VCC, OUT (MAX834), CLEAR to GND ....................-0.3V to +12V IN, OUT (MAX835) to GND.........................-0.3V to (VCC + 0.3V) INPUT Current VCC ................................................................................20mA IN....................................................................................10mA OUT Current.......................................................................
PAGE 3
Micropower, Latching Voltage Monitors in SOT23-5 MAX834/MAX835 ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.5V to +11V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CLEAR Input Low Voltage CONDITIONS MIN TYP VCIL CLEAR Input Leakage Current tCLEAR CLEAR Input Pulse Width ±1 tCLR MAX UNITS 0.4 V ±100 nA 1 µs Note 1: The voltage-detector output remains in the correct state for VCC down to 1.2V when VIN ≤ VCC/2.
PAGE 4
_____________________________Typical Operating Characteristics (continued) (VCC = +5V, Typical Operating Circuit, TA = +25°C, unless otherwise noted.) MAX835 OUTPUT HIGH VOLTAGE vs. SUPPLY VOLTAGE 150 100 400 VCC - VOH (mV) TA = +25°C 300 250 200 TA = +25°C 150 50 100 0 VIN = 1.
PAGE 5
Micropower, Latching Voltage Monitors in SOT23-5 MAX835 OUTPUT HIGH VOLTAGE vs. OUTPUT SOURCE CURRENT TA = -40°C TA = +25°C 10 100 TA = -40°C TA = +25°C 10 1.5 MAXMAX834/835-30 TA = +85°C 1k VCC - VOH (mV) VOL (mV) VCC = 3.6V TA = +85°C 100 MAXMAX834/835-29 VCC = 3.6V 1k 10k MAXMAX834/835-27 10k CLEAR TO OUT PROPAGATION DELAY vs. TEMPERATURE VIN > VTH 1.3 PROPAGATION DELAY (μs) OUTPUT LOW VOLTAGE vs. OUTPUT SINK CURRENT VCC = 3.6V 1.1 0.9 VCC = 5.0V 0.7 0.5 VCC = 11.0V 0.
PAGE 6
MAX834/MAX835 Micropower, Latching Voltage Monitors in SOT23-5 _______________Detailed Description The MAX834/MAX835 micropower voltage monitors contain a 1.204V precision bandgap reference and a comparator with an output latch (Figure 1). The difference between the two parts is the structure of the comparator output driver. The MAX834 has an open-drain, n-channel output driver that can be pulled up to a voltage higher than VCC, but less than 11V.
PAGE 7
Micropower, Latching Voltage Monitors in SOT23-5 CLEAR LATCH VMON RL* R1 OUT CLEAR IN GND VCC OUT Load-Disconnect Switch VCC R2 MAX834 MAX835 0.1μF R1 + R2 R2 (UNITS ARE OHMS AND VOLTS) VTRIP = (1.204) *MAX834 ONLY Figure 4. Monitoring Voltages Other than VCC The circuit in Figure 5 is designed to prevent a leadacid battery or a secondary battery such as an NiCd, from sustaining damage through deep discharge. As the battery reaches critical undervoltage, OUT switches low.
PAGE 8
___________________Chip Information Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. TRANSISTOR COUNT: 74 PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
PAGE 9
Micropower, Latching Voltage Monitors in SOT23-5 REVISION NUMBER REVISION DATE 0 12/96 Initial release — 1 12/05 Added lead-free option to Ordering Information. 1 2 1/07 Fix limits in Electrical Characteristics and add lead-free part numbers. 3 3/10 Updated Electrical Characteristics. DESCRIPTION PAGES CHANGED 1, 2 3 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.