Datasheet
Table Of Contents
- FEATURES
- DESCRIPTION
- APPLICATIONS
- TYPICAL APPLICATION
- ABSOLUTE MAXIMUM RATINGS
- PIN CONFIGURATION
- ORDER INFORMATION
- ELECTRICAL CHARACTERISTICS
- TYPICAL PERFORMANCE CHARACTERISTICS
- PIN FUNCTIONS
- BLOCK DIAGRAM
- OPERATION
- APPLICATIONS INFORMATION
- TYPICAL APPLICATIONS
- PACKAGE DESCRIPTION
- REVISION HISTORY
- TYPICAL APPLICATION
- RELATED PARTS
LTC3101
3
3101fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
USB1
= V
USB2
= V
BAT1
= V
BAT2
= 3V and V
OUT3
= 3.3V, unless
otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Duty Cycle
l
0%
ENA1 Input Logic Threshold
l
0.3 0.7 1.0 V
ENA1 Pull-Down Resistance V
PWRON
= 3V or V
PWRKEY
= 0V 4.0 M
N-Channel Switch Resistance 0.34
P-Channel Switch Resistance Battery Powered
USB Powered
0.55
0.58
N-Channel Switch Leakage V
SW1
= V
USB1,2
= V
BAT1,2
= 5.5V 0.1 5 µA
P-Channel Switch Leakage V
SW1
= 0V, V
USB1,2
= V
BAT1,2
= 5.5V 0.1 10 µA
Power Good Threshold V
FB1
Falling
l
–11 –8 –5 %
Power Good Hysteresis 2.5 %
Buck Converter 2
Feedback Voltage (FB2 Pin)
l
583 596 609 mV
Feedback Pin Input Current (FB2 Pin) 150 nA
P-Channel Current Limit Battery Powered (Note 3)
USB Powered (Note 3)
440
440
540
540
mA
mA
Maximum Duty Cycle
l
100 %
Minimum Duty Cycle
l
0%
ENA2 Input Logic Threshold
l
0.3 0.7 1.0 V
ENA2 Pull-Down Resistance V
PWRON
= 3V or V
PWRKEY
= 0V 4.0 M
N-Channel Switch Resistance 0.34
P-Channel Switch Resistance Battery Powered
USB Powered
0.55
0.58
N-Channel Switch Leakage V
SW2
= V
USB1,2
= V
BAT1,2
= 5.5V 0.1 5 µA
P-Channel Switch Leakage V
SW2
= 0V, V
USB1,2
= V
BAT1,2
= 5.5V 0.1 10 µA
Power Good Threshold V
FB2
Falling
l
–11 –8 –5 %
Power Good Hysteresis 2.5 %
Buck-Boost Converter
Operating Output Voltage
l
1.5 5.25 V
Feedback Voltage (FB3 Pin)
l
584 599 614 mV
Feedback Pin Input Current (FB3 Pin) 150 nA
Inductor Current Limit BAT or USB Powered (Note 3) 1.2 1.5 A
Reverse Inductor Current Limit (Note 3) 400 mA
Burst Mode Inductor Current Limit (Note 3) 450 mA
Maximum Duty Cycle Percentage of Period SW3B is Low in Boost Mode
l
82 87 %
Minimum Duty Cycle Percentage of Period SW3A is High in Buck Mode
l
0%
ENA3 Input Logic Threshold
l
0.3 0.7 1.0 V
ENA3 Pull-Down Resistance V
PWRON
= 3V or V
PWRKEY
= 0V 4.0 M
N-Channel Switch Resistance Switch B (From SW3A to GND)
Switch C (From SW3B to GND)
0.150
0.140
P-Channel Switch Resistance Switch A´ (From BAT2 to SW3A)
Switch A (From USB2 to SW3A)
Switch D (From OUT3 to SW3B)
0.150
0.180
0.195