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PDF MAX16039 Data sheet ( Hoja de datos )

Número de pieza MAX16039
Descripción (MAX16033 - MAX16040) Low-Power Battery Backup Circuits
Fabricantes Maxim Integrated Products 
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19-0882; Rev 0; 7/07
Low-Power Battery Backup
Circuits in Small µDFN Packages
General Description
The MAX16033–MAX16040 supervisory circuits reduce
the complexity and number of components required for
power-supply monitoring and battery control functions
in microprocessor (µP) systems. The devices signifi-
cantly improve system reliability and accuracy com-
pared to other ICs or discrete components. The
MAX16033–MAX16040 provide µP reset, backup-bat-
www.DataSheett4eUry.cosmwitchover, power-fail warning, watchdog, and
chip-enable gating features.
The MAX16033–MAX16040 operate from supply volt-
ages up to 5.5V. The factory-set reset threshold voltage
ranges from 2.32V to 4.63V. The devices feature a man-
ual-reset input (MAX16033/MAX16037), a watchdog
timer input (MAX16034/MAX16038), a battery-on output
(MAX16035/MAX16039), an auxiliary adjustable reset
input (MAX16036/MAX16040), and chip-enable gating
(MAX16033–MAX16036). Each device includes a
power-fail comparator and offers an active-low push-
pull reset or an active-low open-drain reset.
The MAX16033–MAX16040 are available in 2mm x
2mm, 8-pin or 10-pin µDFN packages and are fully
specified from -40°C to +85°C.
Applications
Portable/Battery-
Powered Equipment
POS Equipment
Critical µP/µC Power
Monitoring
Set-Top Boxes
Controllers
Computers
Fax Machines
Industrial Control
Real-Time Clocks
Intelligent Instrument
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
Features
Low 1.2V Operating Supply Voltage
Precision Monitoring of 5.0V, 3.3V, 3.0V, and 2.5V
Power-Supply Voltages
Independent Power-Fail Comparator
Debounced Manual-Reset Input
Watchdog Timer, 1.6s Timeout
Battery-On Output Indicator
Auxiliary User-Adjustable RESETIN
Low 13µA Quiescent Supply Current
Two Available Output Structures:
Active-Low Push-Pull Reset
Active-Low Open-Drain Reset
Active-Low Reset Valid Down to 1.2V
Power-Supply Transient Immunity
140ms (min) Reset Timeout Period
Small 2mm x 2mm, 8-Pin and 10-Pin µDFN
Packages
Ordering Information
PART*
TEMP RANGE PIN-
PKG
PACKAGE CODE
MAX16033LLB_ _+T -40°C to +85°C 10 µDFN-10 L1022-1
MAX16033PLB_ _+T -40°C to +85°C 10 µDFN-10 L1022-1
MAX16034LLB_ _+T -40°C to +85°C 10 µDFN-10 L1022-1
MAX16034PLB_ _+T -40°C to +85°C 10 µDFN-10 L1022-1
Ordering Information continued on last page.
*These parts offer a choice of reset threshold voltages. From the
Reset Threshold Ranges table, insert the desired threshold volt-
age code in the blank to complete the part number. See Selector
Guide for a listing of device features.
+Denotes a lead-free package.
T = Tape and reel.
Selector Guide
PART
MR WATCHDOG BATTON RESETIN CEIN/CEOU
MAX16033_
MAX16034_
MAX16035_
✓✓
MAX16036_
✓✓
MAX16037_
MAX16038_
MAX16039_
MAX16040_
Note: Replace “_” with L for push-pull or P for open-drain RESET and PFO outputs.
PFI, PFO
PIN-PACKAGE
10 µDFN-10
10 µDFN-10
10 µDFN-10
10 µDFN-10
8 µDFN-8
8 µDFN-8
8 µDFN-8
8 µDFN-8
________________________________________________________________ Maxim Integrated Products 1
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.

1 page




MAX16039 pdf
Low-Power Battery Backup
Circuits in Small µDFN Packages
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT
vs. TEMPERATURE
20
VCC = 5V
19
www.DataSheet4U.c18om
17
16
15
14
13
12
11
10
-40
-15 10 35 60
TEMPERATURE (°C)
85
BATTERY SUPPLY CURRENT
(BACKUP MODE) vs. TEMPERATURE
1.0
VBATT = 3V
0.9 VCC = 0V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
BATT-TO-OUT ON-RESISTANCE
vs. TEMPERATURE
1.0
VCC = 0V
9
8
VBATT = 2V
7
6
5
4
3
2 VBATT = 5V
VBATT = 3V
1
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
VCC-TO-OUT ON-RESISTANCE
vs. TEMPERATURE
1.4
VCC = 2.5V
1.2 IOUT = 25mA
1.0
0.8
0.6
VCC = 3V
IOUT = 65mA
VCC = 4.5V
IOUT = 150mA
0.4
0.2
0
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
230
VCC = 5V
225
220
215
210
205
200
195
190
185
180
-40
-15 10 35 60
TEMPERATURE (°C)
85
VCC-TO-RESET PROPAGATION DELAY
vs. TEMPERATURE
120
VCC FALLING
105
0.25V/ms
90
75
60
1V/ms
45
30
15
0
-40 -20
10V/ms
0 20 40 60
TEMPERATURE (°C)
80
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
0.994
0.993
0.992
0.991
0.990
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
300
RESET OCCURS
ABOVE CURVE
250
200 MAX160_ _-46
(VTH = 4.63V)
150
MAX160_ _-29
100 (VTH = 2.93V)
50
0
1 10 100 1000 10,000
RESET THRESHOLD OVERDRIVE (VTH - VCC) (mV)
_______________________________________________________________________________________ 5

5 Page





MAX16039 arduino
Low-Power Battery Backup
Circuits in Small µDFN Packages
BATTON Indicator
(MAX16035/MAX16039 Only)
BATTON is a push-pull output that asserts high when in
battery-backup mode. BATTON typically sinks 3.2mA
at a 0.4V saturation voltage. In battery-backup mode,
this terminal sources approximately 10µA from OUT.
Use BATTON to indicate battery-switchover status or to
supply base drive to an external pass transistor for
www.DataSheeht4iUg.hceomr current applications (see Figure 3).
RESETIN Comparator
(MAX16036/MAX16040 Only)
An internal 1.235V reference sets the RESETIN thresh-
old voltage. RESET asserts when the voltage at
RESETIN is below 1.235V. Use the RESETIN function to
monitor a secondary power supply.
Use the following equations to set the reset threshold
voltage (VRTH) of the secondary power supply (see
Figure 4):
VRTH = VREF (R1 / R2 + 1)
where VREF = 1.235V. To simplify the resistor selection,
choose a value for R2 and calculate R1.
R1 = R2 [(VRTH / VREF) - 1]
Since the input current at RESETIN is 25nA (max), large
values (up to 1M) can be used for R2 with no signifi-
cant loss in accuracy.
Power-Fail Comparator
The MAX16033–MAX16040 issue an interrupt (nonmask-
able or regular) to the µP when a power failure occurs.
The power line is monitored by two external resistors con-
nected to the power-fail input (PFI). When the voltage at
PFI falls below 1.235V, the power-fail output (PFO) drives
the processor’s NMI input low. An earlier power-fail warn-
ing can be generated if the unregulated DC input of the
regulator is available for monitoring. The MAX16033–
MAX16040 turn off the power-fail comparator and force
PFO low when VCC falls below the reset threshold volt-
age (see Figure 1). The MAX160_ _L devices provide
push-pull PFO outputs. The MAX160_ _P devices provide
open-drain PFO outputs.
VCC
VIN
R1
R2
MAX16036
MAX16040
RESETIN
Figure 4. Setting RESETIN Voltage for the
MAX16036/MAX16040
2.4V TO 5.5V
0.1µF
VCC
BATT
BATTON
OUT
(CEOUT)
CE
CMOS RAM
MAX16035
MAX16039
(CEIN)
ADDRESS
DECODE
A0–A15
µP
( ) FOR MAX16035 ONLY
GND
RESET
RESET
Figure 3. MAX16035/MAX16039 BATTON Driving an External Pass Transistor
______________________________________________________________________________________ 11

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