LTC3559 Linear Technology, LTC3559 Datasheet - Page 22

• Manufacturer Part Number: LTC3559
• Description: Linear USB Battery Charger
• Manufacturer: Linear Technology

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LTC3559
TYPICAL APPLICATIONS
22
Dropout and the Output Voltage will be BAT – (I
The Output Voltage of a Buck Regulator is Programmed for 3.3V. When BAT Voltage Approaches 3.3V, the Regulator Operates in
100
90
80
70
60
50
40
30
20
10
0
0.1
Buck Regulator Effi ciency vs I
OPERATION
Burst Mode
3-Resistor Bias Network for NTC Sets Hot and Cold Trip Points at Approximately 55°C and 0°C
4.5V TO 5.5V
1
ADAPTER
I
LOAD
PULSE SKIP
MODE
10
(mA)
100
510Ω
V
PV
PV
OUT
IN
IN
CONTROLLED
= 1.8V
= 2.7V
= 4.2V
3559 TA02b
DIGITALLY
LOAD
110k
28.7k
1000
100k
NTC
NTH50603N01
LOAD
887Ω
• 0.6). An LED at ⎯ C ⎯ H ⎯ R ⎯ G Gives a Visual Indication of the Battery Charger State. A
1μF
MODE
V
NTC
CHRG
PROG
SUSP
HPWR
EN1
EN2
CC
GND
LTC3559
EXPOSED PAD
SW1
SW2
3559 TA03
PV
BAT
FB1
FB2
IN
950mA
UP TO
4.7μH
4.7μH
100
1.02M
90
80
70
60
50
40
30
20
10
806k
0
0.1
2.2μF
Buck Regulator Effi ciency vs I
324k
649k
+
Burst Mode
OPERATION
1
22pF
22pF
SINGLE
Li-lon CELL
2.7V TO 4.2V
I
LOAD
PULSE SKIP
MODE
10
10μF
10μF
(mA)
3.3V AT
400mA
1.8V AT
400mA
100
PV
V
OUT
IN
= 4.2V
= 3.3V
3559 TA02c
LOAD
1000
3559f