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Número de pieza | MAX16034 | |
Descripción | (MAX16033 - MAX16040) Low-Power Battery Backup Circuits | |
Fabricantes | Maxim Integrated Products | |
Logotipo | ||
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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 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 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 1MΩ) 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
11 Page |
Páginas | Total 21 Páginas | |
PDF Descargar | [ Datasheet MAX16034.PDF ] |
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