LTC3555 Linear Technology, LTC3555 Datasheet - Page 7

• Manufacturer Part Number: LTC3555
• Description: High Efficiency USB Power Manager + Triple Step-Down DC/DC
• Manufacturer: Linear Technology

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TYPICAL PERFORMANCE CHARACTERISTICS
100
700
600
500
400
300
200
100
1.0
0.8
0.4
0.2
0.6
90
80
70
60
50
40
0
0
0.01
2.7
0
Ideal Diode V-I Characteristics
PowerPath Switching Regulator
Effi ciency vs Output Current
USB Limited Battery Charge
Current vs Battery Voltage
BAT = 3.8V
5x USB SETTING,
BATTERY CHARGER SET FOR 1A
INTERNAL IDEAL DIODE
WITH SUPPLEMENTAL
EXTERNAL VISHAY
Si2333 PMOS
0.04
3.0
FORWARD VOLTAGE (V)
BATTERY VOLTAGE (V)
1x MODE
OUTPUT CURRENT (A)
V
R
R
BUS
PROG
CLPROG
0.08
3.3
= 5V
0.1
= 1k
= 3k
0.12
INTERNAL IDEAL
DIODE ONLY
3.6
5x, 10x MODE
0.16
V
V
3.9
BUS
BUS
3555 G04
3555 G07
= 0V
= 5V
3555 G01
0.20
4.2
1
0.25
0.20
0.10
0.05
0.15
150
125
100
75
50
25
90
88
82
86
84
80
0
0
2.7
2.7
2.7
Battery Charging Effi ciency vs
Battery Voltage with No External
Load (P
Ideal Diode Resistance
vs Battery Voltage
USB Limited Battery Charge
Current vs Battery Voltage
1x USB SETTING,
BATTERY CHARGER SET FOR 1A
R
R
I
VOUT
CLPROG
PROG
INTERNAL IDEAL
5x CHARGING
3.0
= 0mA
3.0
3.0
= 1k
EFFICIENCY
BAT
= 3k
INTERNAL IDEAL DIODE
DIODE
WITH SUPPLEMENTAL
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
EXTERNAL VISHAY
V
R
R
/P
BUS
Si2333 PMOS
PROG
CLPROG
3.3
3.3
BUS
3.3
= 5V
1x CHARGING
EFFICIENCY
= 1k
)
= 3k
3.6
3.6
3.6
3.9
3.9
3.9
3555 G02
3555 G05
3555 G08
4.2
4.2
4.2
4.50
4.25
4.00
3.75
3.50
3.25
25
20
15
10
50
40
20
10
30
5
0
0
2.7
0
0
Output Voltage vs Output Current
(Battery Charger Disabled)
Battery Drain Current
vs Battery Voltage
V
(Suspend)
I
BAT = 3.8V
I
VOUT
BUS
VOUT
BAT = 3.4V
BAT = 4V
= 0μA
Current vs V
200
= 0mA
3.0
1
OUTPUT CURRENT (mA)
BATTERY VOLTAGE (V)
(SUSPEND MODE)
BUS VOLTAGE (V)
400
3.3
2
V
BUS
LTC3555
BUS
= 5V
600
3.6
3
Voltage
V
BUS
V
5x MODE
800
= 0V
3.9
BUS
4
= 5V
3555 G03
3555 G06
3555 G09
7
3555f
1000
4.2
5