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MAX1538ETI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
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
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)
MAX1538
Power-Source Selector for
Dual-Battery Systems
________________________________________________________________ Maxim Integrated Products 1
19-3169; Rev 0; 1/04
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.
MAX1538
REVBLK
DISA
DISB
BATA
BATB
CHGB
CHGA
CHGIN
ADPIN
EXTLD
ADPBLK
AIRDET
ACDET
MINVA
MINVB
V
DD
CHRG
BATSEL
RELRN
OUT2
OUT1
OUT0
GND
BATSUP
BATTERY
CHARGER
CHG_OUT
SYSTEM LOAD
ADAPTER
BATTERY B
BATTERY A
PART TEMP RANGE PIN-PACKAGE
MAX1538ETI -40°C to +85°C 28 Thin QFN
Ordering Information
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
MAX1538
Power-Source Selector for
Dual-Battery Systems
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
BATA
= V
BATB
= V
CHGIN
= 16.8V, C
VDD
= 1µF, V
MINVA
= V
MINVB
= 0.93V, V
EXTLD
= V
ADPIN
= 28V, V
CHRG
= V
BATSEL
= V
RELRN
= 0,
C
ADPPWR
= C
REVBLK
= C
ADPBLK
= C
DISBAT
= C
DISA
= C
DISB
= C
CHGA
= C
CHGB
= 4.7nF, T
A
= 0°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°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.
V
EXTLD
, V
BATSUP
, V
ADPIN
, V
BATA
, V
BATB
,
V
CHGIN
to GND .................................................-0.3V to +30V
V
ADPPWR
to GND...................................-0.3V to (V
ADPIN
+ 0.3V)
V
REVBLK
, V
ADPBLK
to GND ...................-0.3V to (V
EXTLD
+ 0.3V)
V
CHGA
, V
CHGB,
V
DISBAT
to GND ..........-0.3V to (V
CHGIN
+ 0.3V)
V
DISA
to GND..........................................-0.3V to (V
BATA
+ 0.3V)
V
DISB
to GND..........................................-0.3V to (V
BATB
+ 0.3V)
V
DD
, V
CHRG
, V
BATSEL
, V
RELRN
, V
OUT0
, V
OUT1
, V
OUT2
,
V
MINVA
, V
MINVB
, V
AIRDET
, V
ACDET
to GND..........-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN 5mm x 5mm
(derate 20.8mW/°C above +70°C)..........................1666.7mW
Operating Temperature Range
MAX1538ETI ....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
ADPIN, EXTLD Supply Voltage
Range
4.75 28.00
V
CHGIN, BATA, BATB and
BATSUP Supply Voltage Range
4.75 19.00
V
V
ADPIN
= highest,
V
ADPPWR
= high
21 50
V
ADPIN
= highest,
V
ADPPWR
= low
23 54
V
BATA
= highest,
V
DISA
= high
21 42
V
BATA
= highest, V
DISA
= low
24 50
V
BATB
= highest,
V
DISB
= high
21 42
V
BATB
= highest, V
DISB
= low
24 50
ADPIN, BATA, BATB, BATSUP
Quiescent Current (Current from
the Highest Voltage Supply)
V
BATA
= 4.75V to 19V,
V
BATB
= 4.75V to 19V,
V
BATSUP
= 4.75V to 19V,
V
ADPIN
= 4.75V to 28V,
no external load at V
DD
V
BATSUP
= highest 18 40
µA
V
ADPPWR
= high
0.01
0.5
ADPIN Quiescent Current (ADPIN
Current When Not the Highest
Voltage)
V
ADPIN
= 4.75V to 18V,
no external load at V
DD
V
ADPPWR
= low 2.6 6
µA
V
DISA
= high 3.9 6.0
BATA Quiescent Current (BATA
Current When Not the Highest
Voltage)
V
BATA
= 4.75V to 19V,
no external load at V
DD
V
DISA
= low 7.0 12
µA
V
DISB
= high 3.9 6.0
BATB Quiescent Current (BATB
Current When Not the Highest
Voltage)
V
BATB
= 4.75V to 19V,
no external load at V
DD
V
DISB
= low 7.0 12
µA
Adapter selected (REVBLK or ADPBLK pins low) 3.0 6.1
EXTLD Quiescent Current
Adapter not selected (REVBLK and ADPBLK pins high)
0.02
1.0
µA
AC or ai r l i ne state ( C H G A, C H GB, and D IS BAT p i ns hi g h)
0.03
1.5
Charge state (CHGA or CHGB pin low, DISBAT pin high)
3.1 6.2
CHGIN Quiescent Current
Discharge or relearn state (CHGA or CHGB pin low,
DISBAT pin low)
6.1
12.1
µA
MAX1538
Power-Source Selector for
Dual-Battery Systems
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
BATA
= V
BATB
= V
CHGIN
= 16.8V, C
VDD
= 1µF, V
MINVA
= V
MINVB
= 0.93V, V
EXTLD
= V
ADPIN
= 28V, V
CHRG
= V
BATSEL
= V
RELRN
= 0,
C
ADPPWR
= C
REVBLK
= C
ADPBLK
= C
DISBAT
= C
DISA
= C
DISB
= C
CHGA
= C
CHGB
= 4.7nF, T
A
= 0°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
LINEAR REGULATOR
V
DD
Output Voltage I
VDD
= 0 to 100µA
3.270
3.3
3.330
V
V
BATA
or V
BATB
= 5V to 19V, V
ADPIN
= 5V 1.0
V
BATA
= V
BATB
= 5V, V
ADPIN
= 5V to 28V 1.0
V
DD
Power-Supply Rejection
Ratio
V
BATA
, V
BATB
, or V
ADPIN
= 5V to 19V, sawtooth at
10V/µs, other supplies = 12V
1
mV / V
V
DD
Undervoltage Lockout Rising edge, relative to regulation point -55 -10 mV
COMPARATORS
ACDET, AIRDET Input Voltage
Range
0 5.5 V
ACDET, AIRDET Input Bias
Current
V
AIRDET
= V
ACDET
= 3V 0.1 1 µA
ACDET, AIRDET Trip Threshold Input falling
1.97
2.0
2.03
V
ACDET, AIRDET Hysteresis 20 mV
MINV_ Operating Voltage Range
0.93 2.60
V
MINV_ Input Bias Current V
MINV_
= 0.93V to 2.6V -50
+50
nA
V
MINV_
= 0.93V
4.605 4.65 4.695
V
MINV_
= 1.5V
7.455
7.5
7.545
BAT_ Minimum Voltage Trip
Threshold
V
BAT_
falling
V
MINV_
= 2.6V
12.93
13
13.07
V
BAT_ Minimum Voltage
Hysteresis
125
mV
BAT_ Pack Removal Detection
Threshold
V
BAT_
falling
1.90
2.0
2.10
V
BAT_ Pack Removal Hysteresis 85 mV
GATE DRIVERS (Note 1)
V
SOURCE
= 15V, V
PIN
= 7.5V 18 60
ADPPWR, REVBLK, ADPBLK,
DISBAT, DISA, DISB, CHGA,
CHGB Source Current (PMOS
Turn-Off)
V
SOURCE
= 15V, V
PIN
= 13V 3 15
mA
V
SOURCE
= 15V, V
PIN
= 15V 20 70
ADPPWR, REVBLK, ADPBLK,
DISBAT, DISA, DISB, CHGA,
CHGB Sink Current (PMOS
Turn-On)
V
SOURCE
= 15V, V
PIN
= 9.5V 10 55
mA
V
SOURCE
= 8V to 19V (ADPPWR, REVBLK, and AOPBLK,
V
SOURCE
= 8V to 28V)
-11.0 -9.0 -7.0
ADPPWR, REVBLK, ADPBLK,
DISBAT, DISA, DISB, CHGA,
CHGB Turn-On Clamp Voltage
(V
PIN
to V
SOURCE
)
V
SOURCE
= 4.75V to 8V
-8.00 -3.65
V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

MAX1538ETI+T

Mfr. #:
Buy MAX1538ETI+T
Manufacturer:
Maxim Integrated
Description:
Battery Management Power-Source Select for Dual-Bat System
Lifecycle:
New from this manufacturer.
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