LTC4413EDD#PBF Linear Technology, LTC4413EDD#PBF Datasheet - Page 11

• Manufacturer Part Number: LTC4413EDD#PBF
• Description: IC IDEAL DIODE DUAL 10-DFN
• Manufacturer: Linear Technology

Specifications of LTC4413EDD#PBF

• Applications: Handheld/Mobile Devices
• Fet Type: P-Channel
• Number Of Outputs: 2
• Internal Switch(s): Yes
• Delay Time - On: 11µs
• Delay Time - Off: 2µs
• Voltage - Supply: 2.5 V ~ 5.5 V
• Current - Supply: 25µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Input Voltage: 5.5V
• No. Of Outputs: 2
• Power Dissipation Pd: 1.5W
• Supply Voltage Range: 2.5V To 5.5V
• No. Of Pins: 10
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
If the AUX is present when a wall adapter is applied, as
the resistive divider to ENBB rises through the turn-off
threshold, the STAT pin voltage falls and MP1 conducts,
allowing the wall adapter to power the load. When the wall
adapter is removed while the AUX supply is present, the
load voltage falls until the voltage divider at the ENBB pin
falls through its turn-on threshold. Once this occurs, the
LTC4413 automatically connects the AUX supply to the load
when the AUX voltage exceeds the output voltage, causing
the STAT voltage to rise and disabling the external PFET.
When an AUX supply is attached, the voltage divider at
ENBA (R4 and R5) disconnects the battery from the load,
and the auxiliary supply provides load current, unless a
wall adapter is present as described earlier. If the auxiliary
supply is removed, the battery may again power the load,
depending on if a wall adapter is present.
Multiple Battery Charging
Figure 6 illustrates an application circuit for automatic dual
battery charging from a single charger. Whichever battery
has the lower voltage will receive the larger charging current
CHARGER
BATTERY
INPUT
3,11
1
5
2
4
INA
INB
ENBA
ENBB
GND
LTC4413
ADAPTER
IDEAL
IDEAL
Figure 6
WALL
OUTA
OUTB
STAT
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
9
10
6
4413 F06
C1: C0805C106K8PAC
C2: C1206C475K8PAC
470k
V
ENB
Li CC
BAT1
BAT2
LTC4059
CC
PROG
STAT IS HIGH
WHEN BAT1
IS CHARGING
GND
LOAD1
LOAD2
BAT
R2
100k
Figure 7
1-CELL
Li-Ion
C1
10μF
until both battery voltages are equal, then both are charged.
While both batteries are charging simultaneously, the
higher capacity battery gets proportionally higher current
from the charger. For Li-Ion batteries, both batteries achieve
the fl oat voltage minus the forward regulation voltage of
20mV. This concept can apply to more than two batteries.
The STAT pin provides information as to when battery 1
is being charged. For intelligent control, the ENBA/ENBB
pin inputs can be used with a microcontroller as shown
in Figure 4.
Automatic Switchover from a Battery to a Wall
Adapter and Charger
Figure 7 illustrates the LTC4413 performing the function
of automatically switching a load over from a battery to a
wall adapter while controlling an LTC4059 battery charger.
When no wall adapter is present, the LTC4413 connects
the load at OUTA from the Li-Ion battery at INA. In this
condition, the STAT voltage is high, thereby disabling the
battery charger. If a wall adapter of a higher voltage than
the battery is connected to INB, the load voltage rises as
the second ideal diode conducts. As soon as the OUTA
voltage exceeds INA voltage, the BAT is disconnected
from the load and the STAT voltage falls, turning on the
LTC4059 battery charger and beginning a charge cycle. If
the wall adapter is removed, the voltage at INB collapses
until it is below the load voltage. When this occurs, the
LTC4413 automatically reconnects the battery to the load
and the STAT voltage rises, disabling the LTC4059 battery
charger. One major benefi t of this circuit is that when a
wall adapter is present, the user may remove the battery
and replace it without disrupting the load.
3,11
1
2
4
5
INA
ENBA
ENBB
GND
INB
LTC4413
IDEAL
IDEAL
OUTB
OUTA
STAT
10
6
9
R1
560k
4413 F07
C2
4.7μF
TO LOAD
LTC4413
11
4413fc