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PDF MAX1538 Data sheet ( Hoja de datos )
| Número de pieza | MAX1538 | |
| Descripción | Power-Source Selector for Dual-Battery Systems | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3169; Rev 0; 1/04
www.DataSheet4U.com
Power-Source Selector for
Dual-Battery Systems
General Description
The MAX1538 selector provides power-source control
for dual-battery systems. The device selects between
an AC adapter and dual batteries based on the pres-
ence of the three power sources and the state of
charge of each battery. The MAX1538 includes analog
comparators to detect AC/airline-adapter presence and
determine battery undervoltage. Fast analog circuitry
allows the device to switch between power sources to
implement a break-before-make time, which allows hot
swapping of battery packs. The MAX1538 indepen-
dently performs power-source monitoring and selec-
tion, freeing the system power-management µP for
other tasks. This simplifies the development of µP
power-management firmware and allows the µP to enter
standby, reducing system power consumption.
The MAX1538 supports “relearn mode,” which allows
the system to measure and fully utilize battery capacity.
In this state, the part allows the selected battery to be
discharged even when an AC adapter is present. The
MAX1538 can also be used to power the system in an
aircraft. On detecting an airline adapter, the MAX1538
automatically disables charging or discharging of bat-
tery packs and only allows the system to be powered
from the adapter.
The MAX1538 is available in a space-saving 28-pin thin
QFN package with a maximum footprint of 5mm x 5mm.
Applications
Notebook and Subnotebook Computers
Internet Tablets
Dual-Battery Portable Equipment
Pin Configuration appears at end of data sheet.
Features
♦ Automatically Detects and Responds to
Low-Battery Voltage Condition
Battery Insertion and Removal
AC-Adapter Presence
Airline-Adapter Presence
♦ Step-Down and Step-Up Charger Compatibility
♦ Fast Break-Before-Make Selection
Allows Hot Swapping of Power Sources
No External Schottky Diodes Needed
♦ 50µA Maximum Battery Quiescent Current
♦ Implements Battery Capacity Relearning
♦ Allows Usage of Aircraft Supply
♦ Direct Drive of P-Channel MOSFETs
♦ Simplifies Power-Management µP Firmware
♦ 4.75V to 28V AC-Adapter Input Voltage Range
♦ Small 28-Pin Thin QFN Package (5mm x 5mm)
Ordering Information
PART
MAX1538ETI
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN
Typical Operating Circuit
BATTERY
CHARGER
CHG_OUT
ACDET
AIRDET
CHRG
BATSEL
ADPIN
RELRN
OUT2
REVBLK
OUT1
OUT0
EXTLD
MAX1538
ADPBLK
VDD
CHGIN
CHGA
CHGB
DISB
DISA
MINVA
MINVB
GND
BATB
BATA
BATSUP
________________________________________________________________ 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  
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Power-Source Selector for
Dual-Battery Systems
ELECTRICAL CHARACTERISTICS
(VBATA = VBATB = VCHGIN = 16.8V, CVDD = 1µF, VMINVA = VMINVB = 0.93V, VEXTLD = VADPIN = 28V, VCHRG = VBATSEL = VRELRN = 0,
CADPPWR = CREVBLK = CADPBLK = CDISBAT = CDISA = CDISB = CCHGA = CCHGB = 4.7nF, TA = -40°C to +85°C, unless otherwise noted.)
(Note 2)
PARAMETER
ADPIN, EXTLD Supply Voltage
Range
CONDITIONS
CHGIN, BATA, BATB, and
BATSUP Supply Voltage Range
VADPIN = highest,
VADPPWR = high
ADPIN, BATA, BATB, BATSUP
Quiescent Current (Current from
the Highest Voltage Supply)
ADPIN Quiescent Current (ADPIN
Current When Not the Highest
Voltage)
VBATA = 4.75V to 19V,
VBATB = 4.75V to 19V,
VBATSUP = 4.75V to 19V,
VADPIN = 4.75V to 28V,
no external load at VDD
VADPIN = 4.75V to 18V,
no external load at VDD
VADPIN = highest,
VADPPWR = low
VBATA = highest, VDISA = high
VBATA = highest, VDISA = low
VBATB = highest, VDISB = high
VBATB = highest, VDISB = low
VBATSUP = highest
VADPPWR = high
VADPPWR = low
BATA Quiescent Current (BATA
Current When Not the Highest
Voltage)
VBATA = 4.75V to 19V,
no external load at VDD
VDISA = high
VDISA = low
BATB Quiescent Current (BATB
Current When Not the Highest
Voltage)
VBATB = 4.75V to 19V,
no external load at VDD
VDISB = high
VDISB = low
EXTLD Quiescent Current
CHGIN Quiescent Current
Adapter selected (REVBLK or ADPBLK pins low)
Adapter not selected (REVBLK and ADPBLK pins high)
AC or airline state (CHGA, CHGB, and DISBAT pins high)
Charge state (CHGA or CHGB pin low, DISBAT pin high)
Discharge or relearn state (CHGA or CHGB pin low,
DISBAT pin low)
LINEAR REGULATOR
VDD Output Voltage
VDD Undervoltage Lockout
COMPARATORS
IVDD = 0 to 100µA
Rising edge, relative to regulation point
ACDET, AIRDET Input Voltage
Range
ACDET, AIRDET Trip Threshold Input falling
MINV_ Operating Voltage Range
BAT_ Minimum Voltage Trip
Threshold
VBAT_ falling
VMINV_ = 0.93V
VMINV_ = 1.5V
VMINV_ = 2.6V
MIN
4.75
4.75
3.270
-60
0
1.94
0.93
4.59
7.4
12.86
MAX UNITS
28.00
V
19.00
V
50
54
42
50
42
50
40
1
9
7.5
16
7.5
16
9.5
1.0
1.5
10
18.5
µA
µA
µA
µA
µA
µA
3.330
-10
V
mV
5.5
2.06
2.60
4.72
7.6
13.14
V
V
V
V
_______________________________________________________________________________________ 5
5 Page 
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Power-Source Selector for
Dual-Battery Systems
SYSTEM LOAD
CSYS
CADAPTER
ADAPTER
R1
FOR RELEARN
MODE ONLY
P1
R2 R3
ACDET
AIRDET
ADPIN
ADPPWR
CHRG
BATSEL
RELRN
STEP-DOWN CHARGER
P2
CHARGER INPUT
RSNS IN
CHARGER OUTPUT
CCHG
C2
P3
OUT
P7 P6
CBATB
P8 P5
MAX1538
REVBLK
EXTLD
ADPBLK
LOGIC SUPPLY
D1 D2
CBATA
CHGIN
CHGA
CHGB
DISB
OUT2
OUT1
OUT0
VDD
DISA
MINVA
BATB
BATA
BATSUP
GND MINVB
C3
0.1µF
C1
R10 0.1µF
R11
R12
R13
BATTERY B
BATTERY A
Figure 1. Step-Down Typical Application Circuit
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MAX1538.PDF ] | |
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