MAX1538ETI+T Maxim Integrated Products, MAX1538ETI+T Datasheet - Page 9

• Manufacturer Part Number: MAX1538ETI+T
• Description: IC PWR SOURCE SELECTOR 28-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1538ETI+T

• Function: Dual Battery Controller
• Battery Type: All Battery Types
• Voltage - Supply: 4.75 V ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(Circuit of Figure 1. T
PIN
10
11
12
13
1
2
3
4
5
6
7
8
9
ADPPWR
REVBLK
BATSEL
AIRDET
ACDET
RELRN
MINVA
MINVB
ADPIN
NAME
CHRG
OUT0
OUT1
OUT2
_______________________________________________________________________________________
A
= +25°C, unless otherwise noted.)
BREAK-BEFORE-MAKE TIMING
Minimum Battery A Voltage Set Point. Battery A discharge is prevented if V
V
Minimum Battery B Voltage Set Point. Battery B discharge is prevented if V
V
Battery-Selection Input. Drive to logic low to charge battery A or give discharge preference to battery A.
Drive to logic high to charge battery B or give discharge preference to battery B.
Battery-Relearn Logic-Level Input. Drive RELRN high to enable battery-relearn mode.
Charge-Enable Logic-Level Input. Drive CHRG high to enable the charging path from the charger to the
battery selected by BATSEL.
Selector-State Output. This open-drain output indicates the state of the MAX1538. See Table 1 for
information on decoding.
AC-Adapter Detection Input. When V
presence is detected.
Airline-Adapter Detection Input. When V
detected. Charging is disabled when an airline adapter is detected.
Adapter Input. When V
the ADPPWR MOSFET driver.
Adapter-Power P-Channel MOSFET Driver. Connect ADPPWR to the gate of P1 (Figure 1). P1 disconnects
the adapter from the system during relearn mode. Exclude P1 and leave ADPPWR disconnected if relearn
is not used. ADPPWR is driven relative to ADPIN. ADPPWR and REVBLK are driven with the same control
signal.
Gate Drive for the Reverse-Blocking P-Channel MOSFET. Connect REVBLK to the gate of P2 (Figure 1). P2
enables and disables the AC adapter’s power path. REVBLK is driven relative to EXTLD. REVBLK and
ADPPWR are driven with the same control signal.
TURN-OFF
MINVA
MINVB
MOSFET FOR INITIAL
MOSFET
DISCHARGE PATH
TIME
MOSFET FOR FINAL
DISCHARGE PATH
t
TRANS
.
.
1.00µs/div
TURN-ON
MOSFET
TIME
MAX1538 toc11
ADPIN
Typical Operating Characteristics (continued)
16V
14V
12V
10V
8V
> V
MOSFET
DRIVERS
BATSUP
Power-Source Selector for
ACDET
AIRDET
, the MAX1538 is powered by ADPIN. ADPIN is the supply rail for
is greater than the ACDET trip threshold (2V typ), adapter
> 2V and V
Dual-Battery Systems
FUNCTION
POWER-UP TIME
FIRST SOURCE INSERTION
ACDET
200µs/div
< 2V, the airline-adapter presence is
BATA
BATB
MAX1538 toc12
has fallen below 5 x
has fallen below 5 x
Pin Description
5V
0V
20V
10V
0V
20V
10V
0V
OUT1
OUT2, OUT0
V
V
V
ADPIN
REVBLK
EXTLD
9