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Part: MAX6427DH
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6427, MAX6428, MAX6429, MAX6430, MAX6431, MAX6432, MAX6433, MAX6434, MAX6435, MAX6436, MAX6437, MAX6438 Low-Power, Single/dual-level Battery Monitors With Hysteresis
Company: Maxim Integrated Products
Datasheet: Download MAX6427DH datasheet File size : 13806 kB
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Datasheet text preview:
19-2323; Rev 0; 1/02
Low-Power, Single/Dual-Level Battery Monitors with Hysteresis
General Description
The MAX6427MAX6438 are single/dual-level battery monitors with internal hysteresis. These devices are offered with s i n g l e (MAX6427/MAX6428/MAX6429, MAX6433/ M A X 6 4 3 4 / M A X 6 4 3 5 ) or dual (MAX6430/MAX6431/ MAX6432, MAX6436/MAX6437/MAX6438) low-battery output indicators, which can be used to indicate three battery conditions: battery is good (operate system in normal mode), battery is weak (operate system in low-power mode), or battery is empty (disable the system). These devices are ideal for monitoring single lithium-ion (Li+) cells or multicell alkaline/NiCd/NiMH power supplies. When the power-supply voltage drops below the specified low threshold, the low-battery output asserts. When the voltage rises above the specified high threshold, the lowbattery output is deasserted following a 140ms minimum timeout period. The timeout period ensures that the supply voltages have stabilized before power-converter or microprocessor activity is enabled. The MAX6427MAX6438 family is available with several monitoring options. The MAX6427/MAX6428/MAX6429 offer factory-trimmed battery-monitor thresholds, with a single low-battery output. The MAX6430/MAX6431/MAX6432 also feature factory-trimmed thresholds, but have two lowbattery outputs. The MAX6433MAX6438 have user-adjustable threshold voltages permitting the user to select the hysteresis range, and consequently the sensitivity of the system to noise. A wide hysteresis range also prevents chattering that can result due to battery recovery after load removal. Single l o w - b a t t e r y outputs are supplied by the MAX6433/ MAX6434/MAX6435 and dual low-battery outputs by the MAX6436/MAX6437/MAX6438. The MAX6427MAX6438 family is available with three output logic options for convenient interface with system power circuitry or microprocessors. The family is offered in small SOT23 and SOT143 packages and is fully specified over temperature.
Features
o Factory-Trimmed or User-Adjustable Threshold Options Factory-Trimmed Low Thresholds from 1.6V to 2.1V or 2.6V to 3.1V in 100mV Increments (MAX6427MAX6432) Factory-Trimmed High Thresholds from 2.3V to 2.6V or 3.3V to 3.6V in 100mV Increments (MAX6427MAX6432) User-Adjustable Low/High Thresholds with 615mV Internal Reference (MAX6433MAX6438) o Low Current (1µA typ) o Single or Dual Low-Battery Outputs o Push-Pull LBO, Open-Drain LBO, and Open-Drain LBO Options o 140ms Minimum LBO Timeout Period o Immune to Short Battery Voltage Transients o Guaranteed Valid LBO Logic State to BATT = 1.0V o -40°C to +85°C Operating Temperature Range o Small 3, 4, 5 and 6-Pin SOT Packages o No External Components Required (MAX6427MAX6432)
MAX6427MAX6438
Ordering Information
PART MAX6427_ _UR-T TEMP RANGE -40°C to +85°C PIN-PACKAGE 3 SOT23-3
Ordering Information continued at end of data sheet.
The MAX6427MAX6432 are available with factory-trimmed battery-monitor thresholds. Select the desired thresholds using Tables 1 or 2 and enter the corresponding letters in the part number by replacing "_ _".
________________________Applications
Battery-Powered Systems (Single-Cell Li+ or Two/Three-Cell NiMH, NiCd, Alkaline) Cell Phones/Cordless Phones Portable Medical Devices Electronic Toys Pagers PDAs MP3 Players
Note: There are 26 standard versions with a required order minimum of 2500 pieces. Sample stock is generally held on the standard versions only (see Standard Versions Table). Required order increment is 10,000 pieces for nonstandard versions. Contact factory for availability. All devices available in tape-and-reel only.
Pin Configurations
TOP VIEW
LBO 1 (LBO)
MAX6427 MAX6428 MAX6429
BATT 2
3
GND
SOT23-3
( ) ARE FOR THE MAX6429
Typical Operating Circuit appears at end of data sheet.
Pin Configurations continued at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Low-Power, Single/Dual-Level Battery Monitors with Hysteresis MAX6427MAX6438
ABSOLUTE MAXIMUM RATINGS
BATT, VDD to GND ......-0.3V to +6.0V HTHIN, LTHIN Inputs to GND............-0.3V to (VDD + 0.3V) Open-Drain LBO/LBO, LBOH/LBOH, LBOL/LBOL to GND ........-0.3V to +6.0V Push-Pull LBO/LBO, LBOH/LBOH, LBOL/LBOL to GND .......-0.3V to (BATT or VDD + 0.3V) Input Current (all pins) ........20mA Output Current (all pins) .....20mA Continuous Power Dissipation (TA = +70°C) 3-Pin SOT23-3 (derate 4.0mW/°C above +70°C) .......320mW 4-Pin SOT143-4 (derate 4.0mW/°C above +70°C) .....320mW 5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .......571mW 6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) .......696mW Operating Temperature Range ...-40°C to +85°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses 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.
ELECTRICAL CHARACTERISTICS
(BATT = 1.0V to 5.5V or VDD = 1.6V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETER Operating Voltage Range Operating Voltage Range BATT Supply Current VDD Supply Current SYMBOL V BATT VDD IBATT IDD CONDITIONS TA = -40°C to +85°C TA = 0°C to +70°C TA = -40°C to +85°C BATT = 3.7V, no load (MAX6427MAX6432) VDD = 3.7V, no load (MAX6433MAX6438) MIN 1.2 1.0 1.6 1 1 TYP MAX 5.5 5.5 5.5 1.5 1.5 UNITS V V µA µA
FACTORY-FIXED THRESHOLDS (MAX6427MAX6432) HTH Threshold (Note 2) V HTH Factory-fixed options, BATT rising, LBO deasserted when BATT rises above VHTH (MAX6427/MAX6428/MAX6429) Factory-fixed options, BATT falling, LBO asserted when BATT falls below VLTH (MAX6427/MAX6428/MAX6429) Factory-fixed options, BATT falling, LBOH asserted when BATT falls below VHTH(MAX6430/MAX6431/MAX6432) Factory-fixed options, BATT rising, LBOH deasserted when BATT rises above VHTH+ (MAX6430/MAX6431/MAX6432) Factory-fixed options, BATT falling, LBOL asserted when BATT falls below VLTH(MAX6430/MAX6431/MAX6432) Factory-fixed options, BATT rising, LBOL deasserted when BATT rises above VLTH+ (MAX6430/MAX6431/MAX6432) -2.5 +2.5 %
LTH Threshold (Note 2)
V LTH
-2.5
+2.5
%
HTH- Threshold (Note 2)
V HTH-
-2.5
+2.5
%
HTH+ Threshold (Note 3) LTH- Threshold (Note 2)
V HTH+
-2.5
+2.5
%
V LTH-
-2.5
+2.5
%
LTH+ Threshold (Note 3)
V LTH+
-2.5
+2.5
%
2
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Low-Power, Single/Dual-Level Battery Monitors with Hysteresis
ELECTRICAL CHARACTERISTICS (continued)
(BATT = 1.0V to 5.5V or VDD = 1.6V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX6427MAX6438
USER-ADJUSTABLE THRESHOLDS (MAX6433MAX638) HTHIN Threshold (Note 4) User-adjustable options, HTHIN rising, LBO is deasserted when HTHIN rises above VHTHIN-, VREF = 615mV (MAX6433/MAX6434/MAX6435) User-adjustable options, LTHIN falling, LBOH is asserted when LTHIN falls below VLTHIN-, VREF = 615mV (MAX6433/MAX6434/MAX6435) User-adjustable options, HTHIN rising, LBOH is deasserted when HTHIN rises above VHTHIN+, VREF = 615mV (MAX6436/MAX6437/MAX6438) User-adjustable options, HTHIN falling, LBOH is asserted when HTHIN falls below VHTHIN-, VREF = 585mV (MAX6436/MAX6437/MAX6438) User-adjustable options, LTHIN rising, LBOL is deasserted when LTHIN rises above VLTHIN+, VREF = 615mV (MAX6436/MAX6437/MAX6438) User-adjustable options, LTHIN falling, LBOL is asserted when LTHIN falls below VLTHIN-, VREF = 585mV (MAX6436/MAX6437/MAX6438) VHTHIN or VLTHIN > 400mV
V HTHIN
-2.5
+2.5
%
LTHIN Threshold (Note 4)
V LTHIN
-2.5
+2.5
%
HTHIN+ Threshold (Note 4)
V HTHIN+
-2.5
+2.5
%
HTHIN- Threshold (Note 5)
V HTHIN-
-2.5
+2.5
%
LTHIN+ Threshold (Note 4)
V LTHIN+
-2.5
+2.5
%
LTHIN- Threshold (Note 5)
V LTHIN-
-2.5
+2.5
%
HTHIN/LTHIN Leakage Current (Note 6)
ILKG
20
nA
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3
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