Manual

ManualsBrandsRainbow Electronics ManualsSensorsMAX835

_______________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 Monitor

Load Switching

Battery-Powered Systems

Threshold Detectors

____________________________Features

♦ Prevents Deep Discharge of Batteries

♦ Precision ±1.25% Voltage Threshold

♦ Latched Output (once low, stays low

until cleared)

♦ SOT23-5 Package

♦ Low Cost

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

♦ <2µA Typical Supply Current

♦ Open-Drain Output (MAX834)

Push/Pull Output (MAX835)

MAX834/MAX835

Micropower, Latching Voltage Monitors

in SOT23-5

________________________________________________________________

Maxim Integrated Products

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 0; 12/96

PART

MAX834EUK-T

MAX835EUK-T

-40°C to +85°C

TEMP.

RANGE

PIN-

PACKAGE

5 SOT23-5

______________Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

SOT

TOP MARK

AAAX

AAAY

Summary of content (8 pages)

PAGE 1
9-1157; Rev 0; 12/96 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 High Voltage VCIH CLEAR Input Low Voltage VCIL CLEAR Input Leakage Current MIN TYP MAX UNITS 2 V ICLEAR CLEAR Input Pulse Width Note 1: Note 2: Note 3: Note 4: CONDITIONS ±1 tCLR 0.
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 TA = +25°C TA = +85°C 350 300 250 200 TA = +25°C 150 100 0 15 TA = -40°C 1 2 3 4 5 6 7 9 10 11 12 8 TA = +25°C 10 TA = +85°C 5 0 0 0 0 1 2 3 4 5 6 9 10 11 12 8 7 0 1 2 3 4 5 6 7 8 9 10 11 12 VCC (V) VCC (V) VCC (V) MAX835 OUTPUT SHORT-CIRCUIT SOURCE CURRENT vs.
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 VMON(MAX) = (VCC - 1)(R1 + R2) / R2 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.
PAGE 8
__________________________________________________Tape-and-Reel Information E D P0 W P2 B0 t D1 F P NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD. K0 A0 A0 3.200 ±0.102 E 1.753 ±0.102 P0 B0 3.099 ±0.102 F 3.505 ±0.051 P010 D 1.499 +0.102 +0.000 K0 1.397 ±0.102 P2 P 3.988 ±0.102 t D1 0.991 +0.254 +0.000 3.988 ±0.102 40.005±0.203 2.007±0.051 0.254±0.127 +0.305 -0.102 W 8.