Datasheet

LTC3101
2
3101fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
V
BAT1
, V
BAT2
, V
USB1
, V
USB2
......................... –0.3V to 6V
V
SW1
, V
SW2
, V
SW3A
, V
SW3B
DC ............................................................ –0.3V to 6V
Pulsed (<100ns) ...................................... –1.0V to 7V
Voltage (All Other Pins) ................................ –0.3V to 6V
Operating Temperature Range (Note 2).... –40°C to 85°C
Maximum Junction Temperature (Note 5)............. 125°C
Storage Temperature Range ................... –65°C to 150°C
(Note 1)
24 23 22 21 20 19
7 8 9
TOP VIEW
25
GND
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18PWM
SW1
BAT1
USB1
SW2
PWRON
HSO
OUT3
USB2
SW3A
BAT2
RESET
ENA2 FB1 FB2 ENA1 SW3B ENA3
FB3
PWRKEY
PBSTAT
LDO
MAX
C
RS
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3101EUF#PBF LTC3101EUF#TRPBF 3101
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
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
Input Operating Voltage Battery Powered
USB Powered
l
l
1.8
1.8
5.5
5.5
V
V
Undervoltage Lockout Threshold Battery Powered, V
BAT
Rising
USB Powered, V
USB
Rising
l
l
1.7
1.7
1.8
1.8
V
V
Input Quiescent Current in Standby V
PWRON
= 0V, V
PWRKEY
= 3V 15 µA
Input Quiescent Current in Burst Mode Operation All Converters Enabled, V
FB1
= V
FB2
= V
FB3
= 0.66V 38 µA
Oscillator Frequency
l
1.02 1.27 1.52 MHz
Buck Converter 1
Feedback Voltage (FB1 Pin)
l
583 596 609 mV
Feedback Pin Input Current (FB1 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 %