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LTC3555EUFD-3-PBF Datasheet(PDF) 7 Page - Linear Technology

Part # LTC3555EUFD-3-PBF
Description  High Effi ciency USB Power Manager Triple Step-Down DC/DC
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3555EUFD-3-PBF Datasheet(HTML) 7 Page - Linear Technology

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


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