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LTC4066EUF#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LTC4066/LTC4066-1
13
4066fc
OPERATION
Table 1. Operating Modes—PowerPath States
Current Limited Input Power (IN to OUT)
WALL PRESENT SHUTDOWN SUSPEND V
IN
> 3.8V V
IN
> (V
OUT
+ 100mV) V
IN
> (V
BAT
+ 100mV) CURRENT LIMIT ENABLED
YXXX X X N
XYXX X X N
XXYX X X N
XXXN X X N
XXXX N X N
XXXX X N N
NNNY Y Y Y
Battery Charger (OUT to BAT)
WALL PRESENT SHUTDOWN SUSPEND V
OUT
> 4.35V V
OUT
> (V
BAT
+ 100mV) CHARGER ENABLED
XYXX X N
XXXN X N
XXXX N N
XNXY Y Y
Ideal Diode (BAT to OUT)
WALL PRESENT SHUTDOWN SUSPEND V
BAT
> 2.8V V
BAT
> V
OUT
V
IN
DIODE ENABLED
XYXX X X N
XXXN X X N
XXXX N X N
XNXY Y X Y
Table 2. Operating Modes—Pin Currents vs Programmed Currents (Powered from IN)
PROGRAMMING OUTPUT CURRENT BATTERY CURRENT INPUT CURRENT
I
CL
= I
CHG
I
OUT
< I
CL
I
OUT
= I
CL
= I
CHG
I
OUT
> I
CL
I
BAT
= I
CHG
– I
OUT
I
BAT
= 0
I
BAT
= I
CL
– I
OUT
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
CL
> I
CHG
I
OUT
< (I
CL
– I
CHG
)
I
OUT
> (I
CL
– I
CHG
)
I
OUT
= I
CL
I
OUT
> I
CL
I
BAT
= I
CHG
I
BAT
= I
CL
– I
OUT
I
BAT
= 0
I
BAT
= I
CL
– I
OUT
I
IN
= I
Q
+ I
CHG
+ I
OUT
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
I
CL
< I
CHG
I
OUT
< I
CL
I
OUT
> I
CL
I
BAT
= I
CL
– I
OUT
I
BAT
= I
CL
– I
OUT
I
IN
= I
Q
+ I
CL
I
IN
= I
Q
+ I
CL
LTC4066/LTC4066-1
14
4066fc
OPERATION
• CURRENT LIMIT FROM IN TO OUT DISABLED
• BATTERY CHARGING ON
• CHARGE CURRENT C/10
• CHRG PULLED LOW
• ACPR PULLED LOW
V
OUT
CHARGING LOW BATTERY
• CURRENT LIMIT FROM IN TO OUT DISABLED
• BATTERY CHARGING ON
• CHRG PULLED LOW
• ACPR PULLED LOW
V
OUT
CHARGING BATTERY
• BATTERY CHARGING SUSPENDED
• CHRG PULLED LOW
NTC FAULT
• CHARGING DISABLED
• BATTERY POWERS V
OUT
UVLO
• CHARGING SUSPENDED
• CHRG HIGH-Z
BATTERY POWERS V
OUT
• CHARGING SUSPENDED
• CHRG PULLED LOW
BATTERY POWERS V
OUT
TEMP OK AND
BATTERY < 2.8V
TEMP NOT OK
4066 SD
• CURRENT LIMIT FROM
IN TO OUT DISABLED
• ACPR PULLED LOW
V
OUT
POWERS PART
TEMP OK AND
BATTERY > 2.8V
BATTERY > 4.1V
(4.0V LTC4066-1)
AND CHARGER
TIMED OUT
TEMP NOT OK
BATTERY > 2.8V
BATTERY < 4.1V
(4.0V LTC4066-1)
WALL ADAPTER PRESENT
WALL ADAPTER PRESENT
WALL ADAPTER PRESENT
POWER APPLIED TO V
IN
BATTERY < 2.8V
1/4 TIMEOUT
AND
BATTERY < 2.8V
1/4 TIMEOUT
AND
BATTERY < 2.8V
BATTERY > 4.1V
(4.0V LTC4066-1)
AND CHARGER
TIMED OUT
• BATTERY CHARGING ON
• CHARGE CURRENT C/10
• CHRG PULLED LOW
• BATTERY POWER TO V
OUT
IS OFF
V
IN
CHARGING LOW BATTERY
• CURRENT LIMIT FROM IN TO OUT ENABLED
• BATTERY CHARGING ON
• CHRG PULLED LOW
V
IN
CHARGING BATTERY
• BATTERY CHARGING SUSPENDED
• CHRG PULLED LOW
NTC FAULT
TEMP OK AND
BATTERY < 2.8V
TEMP NOT OK
TEMP OK AND
BATTERY > 2.8V
TEMP NOT OK
• CURRENT LIMIT FROM
IN TO OUT ENABLED
V
IN
POWERS PART
BATTERY < 2.8V
WALL ADAPTER PRESENT
BATTERY < 4.1V
(4.0V LTC4066-1)
BATTERY < 2.8V
BATTERY > 2.8V
(V
IN
AND V
OUT
) < UVLO
BATTERY > 2.8V
V
OUT
< V
BAT
V
OUT
> V
BAT
• CHRG IS HI-Z
• BATTERY POWER TO V
OUT
—DISABLED
BAD BATTERY
• CHRG IS HI-Z
• BATTERY POWER TO V
OUT
—DISABLED
LOW BATTERY
• CHRG IS HI-Z
• BATTERY POWER TO V
OUT
—DISABLED
BAD BATTERY
• CHARGING DISABLED
• ALL SWITCHES OPEN
SHUTDOWN
SHUTDOWN
V
OUT
< V
BAT
V
OUT
> V
BAT
SHDN
Operatinal State Diagram
LTC4066/LTC4066-1
15
4066fc
APPLICATIONS INFORMATION
USB Current Limit and Charge Current Control
The current limit and charger control circuits of the
LTC4066/LTC4066-1 are designed to limit input current as
well as control battery charge current as a function of I
OUT
.
The programmed input current limit, I
CL
, is defi ned as:
I
R
V
V
R
CL
CLPROG
CLPROG
CLPROG
=
⎛
⎝
⎜
⎞
⎠
⎟
=
1000 1000
•
The programmed battery charge current, I
CHG
, is defi ned
as:
I
R
V
V
R
CHG
PROG
PROG
PROG
=
⎛
⎝
⎜
⎞
⎠
⎟
=
50 000 50 000,
•
,
Input current, I
IN
, is equal to the sum of the BAT pin output
current and the OUT pin output current:
I
IN
= I
OUT
+ I
BAT
The current limiting circuitry in the LTC4066/LTC4066-1
can and should be confi gured to limit current to 500mA
for USB applications (selectable using the HPWR pin and
programmed using the CLPROG pin).
The LTC4066/LTC4066-1 reduce battery charge current
such that the sum of the battery charge current and the
load current does not exceed the programmed input current
limit (one-fi fth of the programmed input current limit when
HPWR is low, see Figure 2). The battery charge current
goes to zero when load current exceeds the programmed
input current limit (one-fi fth of the limit when HPWR is
low). If the load current is greater than the current limit, the
output voltage will drop to just under the battery voltage
where the ideal diode circuit will take over and the excess
load current will be drawn from the battery.
Programming Current Limit
The formula for input current limit is:
I
R
V
V
R
CL
CLPROG
CLPROG
CLPROG
=
⎛
⎝
⎜
⎞
⎠
⎟
=
1000 1000
•
where V
CLPROG
is the CLPROG pin voltage and R
CLPROG
is
the total resistance from the CLPROG pin to ground.
For example, if typical 500mA current limit is required,
calculate:
R
V
mA
k
CLPROG
==
1
500
1000 2•
I
LOAD
(mA)
0
CURRENT (mA)
300
400
600
500
I
IN
400
4066 F02a
200
100
–100
0
100
200
300
600500
I
LOAD
I
BAT
CHARGING
I
BAT
(IDEAL DIODE)
I
LOAD
(mA)
0
CURRENT (mA)
60
80
120
100
I
IN
80
4066 F02a
40
20
–20
0
20
40
60
120100
I
LOAD
I
BAT
CHARGING
I
BAT
(IDEAL DIODE)
I
LOAD
(mA)
0
CURRENT (mA)
300
400
600
500
I
IN
400
4055 F02c
200
100
–100
0
100
200
300
600500
I
LOAD
I
BAT
CHARGING
I
BAT
(IDEAL DIODE)
I
BAT
= I
CHG
I
BAT
= I
CL
– I
OUT
(2a) High Power Mode/Full Charge
R
PROG
= 100k and R
CLPROG
= 2k
(2b) Low Power Mode/Full Charge
R
PROG
= 100k and R
CLPROG
= 2k
(2c) High Power Mode with
I
CL
= 500mA and I
CHG
= 250mA
R
PROG
= 200k and R
CLPROG
= 2k
Figure 2. Input and Battery Currents as a Function of Load Current
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LTC4066EUF#PBF

Mfr. #:
Buy LTC4066EUF#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management USB Power Manager and Li-Ion Charger
Lifecycle:
New from this manufacturer.
Delivery:
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