|
|
PDF MAX1773 Data sheet ( Hoja de datos )
| Número de pieza | MAX1773 | |
| Descripción | Power Source Selector for Dual-Battery Systems | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX1773 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
19-1796; Rev 1; 1/03
EVAALVUAAILTAIOBNLEKIT
Power Source Selector for
Dual-Battery Systems
General Description
The MAX1773/MAX1773A highly integrated ICs serve
as the control logic for a system with multiple power
sources. They directly drive external P-channel
MOSFETs to select from an AC adapter and dual bat-
tery sources for charge and discharge. The selection is
made based on the presence of the power sources and
the state of the batteries. The MAX1773/MAX1773A
detect low battery conditions using integrated analog
comparators and check for the presence of a battery
by using battery thermistor outputs.
The MAX1773/MAX1773A are designed for use with a
buck topology charger. They provide a simple and easily
controlled solution to a difficult analog power control prob-
lem. The MAX1773/MAX1773A provide most of the power
source monitoring and selection, freeing the system power
management microprocessor (µP) for other tasks. This not
only simplifies development of the power management
firmware for the µP but also allows the µP to enter standby,
thereby reducing system power consumption.
The MAX1773A is recommended for new designs.
________________________Applications
Notebook and Subnotebook Computers
PDAs and Handy-Terminals
Internet Tablets
Dual-Battery Portable Equipment
Features
o Patented† 7-MOSFET Topology Offers Low-Cost
Solution
o Automatically Detects and Responds to:
Low Battery Voltage Condition
Battery Insertion and Removal
AC Adapter Presence
o Direct Drive of P-Channel MOSFETs
o Simplifies Power Management µP Firmware
o Extends Battery Life by Allowing Power
Management µP to Enter Standby
o 4.75V to 28V AC Adapter Input Voltage Range
o Integrated LDO with 1mA Drive Capability
o Small Footprint 20-Pin TSSOP Package
Ordering Information
PART
MAX1773EUP
MAX1773AEUP
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
20 TSSOP
Pin Configuration appears at end of data sheet.
†Covered by U.S. Patent number 5,764,032.
Typical Operating Circuit
AC ADAPTER
INPUT
SYSTEM LOGIC SUPPLY
FROM HOST µP
TO HOST µP
BATSEL
ACPRES
BATSTAT
ACDET
PDS
VDD
MINV
3.3V
BATTERY
A
MAX1773
MAX1773A
EXTLD
THMA
BATA
TCOMP
THMB
BATB
COMA
DISA
CHGA
COMB
DISB
CHGB
3.3V
BATTERY
B
STEP-DOWN
CHARGER
OUTPUT
INPUT
OUTPUT
3.3V DC-DC
CONVERTER
INPUT
SYSTEM LOAD
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Power Source Selector for
Dual-Battery Systems
ELECTRICAL CHARACTERISTICS (continued)
(VBATA = VBATB = 16.8V, CVDD = 3.3µF, VMINV = 0.93V, VEXTLD = VACDET = 28V, VTCOMP = 3V, VTHMA = VTHMB = 1.65V,
VBATSEL = 0, CCOMA = CCOMB = CDISA = CDISB = CCHGA = CCHGB = CPDS = 5nF, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER
THM_ Input Voltage Range
THM_ Input Leakage Current
TCOMP Input Voltage Range
ACDET Operating Voltage Range
ACDET Logic Threshold High
ACDET Input Bias Current
ACDET to BATA Trip Threshold
ACDET to BATA Hysteresis
ACDET to BATB Trip Threshold
ACDET to BATB Hysteresis
MINV Operating Voltage Range
MINV Input Bias Current
BAT_ Minimum Voltage Trip Threshold
BATSEL Input Low Voltage
BATSEL Input High Voltage
BATSEL Input Leakage Current
BATSEL Action Delay
GATE DRIVERS
COM_ Initial Source Current
COM_ Final Source Current
COM_ Sink Current (PMOS Turn-On)
COM_ Turn-On Clamp Voltage
(VCOM_ to VBAT_)
PDS Source Current (PMOS Turn-Off)
PDS Sink Current (PMOS Turn-On)
PDS Leakage Current (PMOS Off)
CHG_ Sink Current (PMOS Turn-On)
CONDITIONS
VTHM_= 5.5V
VTHMA = VTHMB = 0 to 5.5V
VBATA = VBATB = VEXTLD = 4.75V
(Note 3)
VACDET = 3V, VACDET < VBATA and VBATB
VACDET = 3V, VACDET < VBATB, VBATA = 0
VACDET = 28V, VACDET > VBATA and VBATB
VACDET falling with respect to VBATA
VACDET falling with respect to VBATB
VBATA = VBATB = 5 × VMINV
VMINV = 0.93V to 2.6V
VBAT_ falling
VMINV = 0.93V
VMINV = 2.6V
Typical hysteresis is 100mV
VBATSEL = 5.5V
MIN TYP MAX UNITS
0 5.5 V
100 NA
0 5.5
V
0 4.3
2.2 28.0 V
2.2 V
8
9 µA
11
-35 +125 mV
100 200 mV
-35 +125 mV
100 200 mV
0.93 2.60 V
-100
+100 nA
4.55
12.7
4.75
V
13.3
0.8 V
2.0 V
1 µA
20 100 µs
VBAT_ = 16.8V, VCOM_ = 14.8V
VBAT_ = 16.8V, VCOM_ = 16.4V
VBAT_ = 16.8V, VCOM_ = 14.8V
VCOM_ = 11.8V, VBAT_ = 16.8V (Note 4)
VBAT_ = 8V to 19V
VBAT_ = 4.75V to 8V
VPDS = 10V, VEXTLD = 12V
VPDS = 2V to 28V
VPDS = 28V
VCHG_ = 2V to 22V
4
10
50
2
-11.5
-8.00
4
0.7
0.6
150
-7.25
-4.25
1.3
2
1.4
mA
µA
mA
V
mA
mA
µA
mA
_______________________________________________________________________________________ 5
5 Page 
Power Source Selector for
Dual-Battery Systems
Transition Time Diagrams (continued)
(VCOM_GS = COM_ turn-on clamp voltage, VDIS_GS = DIS_ turn-on clamp voltage, VCHARGER = system step-down charger output.)
VACDET
VDIS_
MAX1773-Fig-05
ACDET TO BAT_ TRIP
THRESHOLD
VEXTLD
3V
VEXTLD + VDIS_GS
AC TO BATTERY SWITCHOVER DELAY
VBAT_ > 5 ✕ VMINV
VTHM_ < VTCOMP
Figure 5. AC to Battery Switchover Delay
VACDET
VDIS_
MAX1773-Fig-06
ACDET TO BAT_ TRIP
THRESHOLD
VEXTLD
VEXTLD + VDIS_GS
BATTERY TO AC SWITCHOVER DELAY
VBAT_ > 5 ✕ VMINV
VTHM_ < VTCOMP
Figure 6. Battery to AC Switchover Delay
VBATSEL
VCHGA
VCHGB
MAX1773-Fig-07
VCHARGER
VCHARGER
CHG_ TURN-ON DELAY
VTHMA < VTCOMP
VTHMB < VTCOMP
Figure 7. Charge Turn-On Delay (Battery A to Battery B)
VBATSEL
VCHGB
VCHGA
MAX1773-Fig-08
VCHARGER
VCHARGER
CHG_ TURN-ON DELAY
VTHMA < VTCOMP
VTHMB < VTCOMP
Figure 8. Charge Turn-On Delay (Battery B to Battery A)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MAX1773.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX177 | CMOS 10-Bit A/D Converter with Track-and-Hold | Maxim Integrated |
| MAX1771 | 12V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controller | Maxim Integrated |
| MAX17710 | Energy-Harvesting Charger and Protector | Maxim Integrated |
| MAX1772 | Low-Cost / Multichemistry Battery- Charger Building Block | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |