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Linear Technology Electronic Components Datasheet

LTC3101 Datasheet

Multi-Output DC/DC Converter and PowerPath Controller

No Preview Available !

FEATURES
n Low Loss PowerPath™ Control: Seamless,
Automatic Transition from Battery to USB or
Wall Adapter Power
n Wide VIN Range: 1.8V to 5.5V
n Buck-Boost VOUT: 1.5V to 5.25V
n Buck-Boost Generates 3.3V at 300mA for
VIN ≥ 1.8V, 3.3V at 800mA for VIN ≥ 3V
n Dual 350mA Buck Regulators, VOUT: 0.6V to VIN
n 38μA Quiescent Current in Burst Mode® Operation
n 1.8V, 50mA Always-On LDO
n Protected 100mA Hot Swap™ Output
n Pushbutton On/Off Control
n Current Limited 200mA MAX Output
n Programmable Power-Up Sequencing
n 24-lead 4mm × 4mm × 0.75mm QFN Package
APPLICATIONS
n Ultra-Portable Digital Video Cameras
n Personal Handheld GPS Navigators
n Portable Medical Instruments
LTC3101
Wide VIN, Multi-Output
DC/DC Converter and
PowerPath Controller
DESCRIPTION
The LTC®3101 is a complete power management solution
for low power portable devices. It provides three high
efficiency switching DC/DC converters which seamlessly
transition from battery to USB/wall adapter power when
available. A synchronous buck-boost regulator provides
complete flexibility, allowing operation from a single
Li-Ion/Polymer battery, 2 to 3 AA cells, a USB port or any
other power source operating from 1.8V to 5.5V.
Two always-alive outputs, a 50mA LDO and a 200mA MAX
output that tracks the higher voltage input supply, provide
power for critical functions or additional external regula-
tors. Flash memory cards can be directly powered from
the protected 100mA Hot Swap output. Pushbutton control
logic and a programmable-duration microprocessor reset
generator simplify interfacing to a microprocessor while
internal sequencing and independent enable pins provide
flexible power-up options. The LTC3101 is available in a low
profile (0.75mm) 24-lead 4mm × 4mm QFN package.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and Hot Swap and PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
2 AA +
10μF
CELLS
4.7μH
10μF 1M
VOUT3 = 3.3V
300mA FOR VIN ≥ 1.8V
800mA FOR VIN ≥ 3V
USB/WALL
ADAPTER
4.3V TO 5.5V
10μF
0.1μF
DIS ENA
ON/OFF
μP
BAT1 BAT2 SW3A
USB1
USB2
CRS
SW3B OUT3
FB3
HSO
MAX
LDO
ENA1
ENA2
SW2
ENA3
LTC3101
FB2
PWRKEY
PBSTAT
PWM
SW1
PWRON
RESET
FB1
GND
221k
Hot Swap OUTPUT: 3.3V AT 100mA
TRACKING OUTPUT: 200mA
1.8V AT 50mA
4.7μH
221k
4.7μF
10μF
VOUT2
1.8V
350mA
110k
4.7μH
221k
10μF
VOUT1
1.5V
350mA
147k
3101 TA01a
Efficiency vs VBAT
96
BUCK-BOOST
IOUT = 150mA
94
92
BUCK2
90
IOUT = 150mA
BUCK1
88
IOUT = 150mA
86
84
1.5
2.5
3.5
4.5
5.5
VBAT (V)
3101 TA01b
3101fb
1


Linear Technology Electronic Components Datasheet

LTC3101 Datasheet

Multi-Output DC/DC Converter and PowerPath Controller

No Preview Available !

LTC3101
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VBAT1, VBAT2, VUSB1, VUSB2 ......................... –0.3V to 6V
VSW1, VSW2, VSW3A, VSW3B
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
PIN CONFIGURATION
TOP VIEW
24 23 22 21 20 19
PWM 1
SW1 2
BAT1 3
USB1 4
SW2 5
PWRON 6
18 HSO
17 OUT3
25
16 USB2
GND
15 SW3A
14 BAT2
13 RESET
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 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 specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VUSB1 = VUSB2 = VBAT1 = VBAT2 = 3V and VOUT3 = 3.3V, unless
otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Operating Voltage
Battery Powered
USB Powered
l 1.8
l 1.8
5.5
V
5.5
V
Undervoltage Lockout Threshold
Battery Powered, VBAT Rising
USB Powered, VUSB Rising
l
1.7
1.8
V
l
1.7
1.8
V
Input Quiescent Current in Standby
VPWRON = 0V, VPWRKEY = 3V
15
μA
Input Quiescent Current in Burst Mode Operation All Converters Enabled, VFB1 = VFB2 = VFB3 = 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)
1
50
nA
P-Channel Current Limit
Battery Powered (Note 3)
USB Powered (Note 3)
440 540
mA
440 540
mA
Maximum Duty Cycle
l 100
%
3101fb
2


Part Number LTC3101
Description Multi-Output DC/DC Converter and PowerPath Controller
Maker Linear Technology
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LTC3101 Datasheet PDF






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