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Linear Technology Electronic Components Datasheet

LTC3100EUD Datasheet

1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

No Preview Available !

FEATURES
n Extremely Compact Triple-Rail Solution
n Burst Mode® Operation, IQ = 15µA
n 1.5MHz Fixed Frequency Operation
n Power Good Indicators
n 700mA Synchronous Step-Up DC/DC
0.65V to 5V VIN Range
1.5V to 5.25V VOUT Range
94% Peak Efficiency
VIN > VOUT Operation
Output Disconnect
n 250mA Synchronous Step-Down DC/DC
1.8V to 5.5V VIN Range
0.6V to 5.5V VOUT Range
n LDO (VIN Internally Tied to VBST)
0.6V to 5.25V VOUT Range
200mV Dropout Voltage at 100mA
n Available in a 16-Lead 3mm × 3mm QFN Package
APPLICATIONS
n Bar Code Readers
n Medical Instruments
n Low Power Portable Electronic Devices
LTC3100
1.5MHz Synchronous Dual
Channel DC/DC Converter
and 100mA LDO
DESCRIPTION
The LTC®3100 combines a high efficiency 700mA syn-
chronous step-up converter, a 250mA synchronous step-
down converter and a 100mA LDO regulator. The LTC3100
features a wide input voltage range of 0.65V to 5V. The
step-down converter can be powered by the output of
the step-up converter or from a separate power source
between 1.8V and 5.5V. The LDO can also be used as a
sequencing switch on the output of the boost.
A switching frequency of 1.5MHz minimizes solution foot-
print by allowing the use of tiny, low profile inductors and
ceramic capacitors. The switching regulators use current
mode control and are internally compensated, reducing
external parts count. Each converter automatically transi-
tions to Burst Mode operation to maintain high efficiency
over the full load range. Burst Mode operation can be
disabled for low noise applications. The integrated LDO
provides a third low noise, low dropout supply.
Anti-ringing circuitry reduces EMI by damping the boost
inductor in discontinuous mode. Additional features
include shutdown current of under 1µA and overtem-
perature shutdown. The LTC3100 is housed in a 16-lead
3mm × 3mm 0.75mm QFN package.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Two-Cell, Triple Output Converter
3.3µH
VBATT
1.6V TO 3.2V
2.2µF
SWBST VINBK VBST
VINBST
FBBST
LTC3100
PGBST
VLDO
FF EN_BURST
BOOST OFF ON
LDO OFF ON
BUCK OFF ON
MODE
RUNBST
FBLDO
SWBK
4.7µH
RUNLDO
FBBK
RUNBK GND
PGBK
3100 TA01a
1.87M
1.07M
102k
25.5k
2M
1M
10µF
×2
2.2µF
10µF
3.3V AT 100mA
VBOOST
1M
BOOST_GOOD
3V AT 50mA
VLDO
1.8V AT 200mA
VBUCK
1M
BUCK_GOOD
Efficiency and Power Loss
vs Load Current, VIN = 2.4V
100
90
80
70
60
50
40
30
20
10
0
0.01
1000
100
10
1
BOOST
BUCK
0.1
PL, BOOST
PL, BUCK
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
3100 TA01b
For more information www.linear.com/LTC3100
3100fb
1


Linear Technology Electronic Components Datasheet

LTC3100EUD Datasheet

1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

No Preview Available !

LTC3100
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VINBST and VINBK Voltage ............................... –0.3 to 6V
SWBST, SWBK DC Voltage.............................. –0.3 to 6V
SWBST, SWBK Pulsed (< 100ns) Voltage....... –0.3 to 7V
FBBST, FBBK, FBLDO, PGBST, PGBK Voltage.. –0.3 to 6V
MODE, RUNBST, RUNBK, RUNLDO Voltage.... –0.3 to 6V
VBST, VLDO...................................................... –0.3 to 6V
Operating Temperature (Notes 2, 5)..........–40°C to 85°C
Storage Temperature Range....................–65°C to 125°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13
SWBST 1
12 FBBST
VBST 2
VLDO 3
SWBK 4
11 FBLDO
17
10 RUNLDO
9 FBBK
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 68°C/W, 4-LAYER BOARD
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB (NOTE 6)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3100EUD#PBF
LTC3100EUD#TRPBF
LDJR
16-Lead (3mm × 3mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS: STEP-UP CONVERTER The l denotes the specifications
which apply over the full operating temperature range. Extended commercial grade: –40°C to 85°C, VINBST = 1.2V, VBST = 3.3V,
TA = 25°C, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Start-Up Voltage
ILOAD = 1mA
l
0.65 0.90
V
Input Voltage Range
After Start-Up (Minimum Voltage Is Load Dependent)
l 0.5
5
V
Output Voltage Adjust Range
l 1.5
5.25
V
Feedback Voltage
l 1.182 1.200 1.218
V
Feedback Input Current
FBBST = 1.2V
1
50
nA
Quiescent Current (VIN): Shutdown RUNBST = 0V, Not Including Switch Leakage, VBST = 0V, VINBK = 0V
0.01
1
µA
Quiescent Current: Active
Quiescent Current: Burst Mode
Operation
Measured on VBST (Note 4), RUNBK = 0V, RUNLDO = 0V
Measured on VBST, FBBST > 1.25V
MODE = 1V, RUNLDO = 0V
MODE = 1V, RUNLDO = 1V
300
500
µA
15
25
µA
28
45
µA
N-Channel MOSFET Switch Leakage SWBST = 5V, VBST= 5V
Current
0.1
5
µA
P-Channel MOSFET Switch Leakage SWBST = 0V, VBST = 5V
Current
0.1
10
µA
3100fb
2
For more information www.linear.com/LTC3100


Part Number LTC3100EUD
Description 1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO
Maker Linear
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