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LTC3100
1
3100fb
For more information www.linear.com/LTC3100
SWBST V
INBK
V
BST
LTC3100
FBBST
3.3礖
1.87M
1.07M
3.3V AT 100mA
10礔
?
2.2礔
V
LDO
V
INBST
FBLDO
SWBK
PGBK
PGBST
102k
25.5k
BOOST
LDO
BUCK
V
BATT
1.6V TO 3.2V
2.2礔
FBBK
2M
1M
10礔
3100 TA01a
MODE
RUNBST
RUNLDO
RUNBK  GND
FF EN_BURST
OFF ON
OFF ON
OFF ON
4.7礖
V
BOOST
3V AT 50mA
V
LDO
1.8V AT 200mA
V
BUCK
BOOST_GOOD
BUCK_GOOD
1M
1M
The LTC
?/DIV>
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 1礎 and overtem-
perature shutdown. The LTC3100 is housed in a 16-lead
3mm ?3mm 0.75mm QFN package.
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.5MHz Synchronous Dual
Channel DC/DC Converter
and 100mA LDO
Two-Cell, Triple Output Converter
n
 Extremely Compact Triple-Rail Solution
n
 Burst Mode
?/DIV>
 Operation, I
Q
 = 15礎
n
 1.5MHz Fixed Frequency Operation
n
 Power Good Indicators
n
 700mA Synchronous Step-Up DC/DC
  0.65V to 5V V
IN
 Range
  1.5V to 5.25V V
OUT
 Range
  94% Peak Efficiency
  V
IN
 > V
OUT
 Operation
  Output Disconnect
n
 250mA Synchronous Step-Down DC/DC
  1.8V to 5.5V V
IN
 Range
  0.6V to 5.5V V
OUT
 Range
n
 LDO (V
IN
 Internally Tied to V
BST
)
  0.6V to 5.25V V
OUT
 Range
  200mV Dropout Voltage at 100mA
n
 Available in a 16-Lead 3mm ?3mm QFN Package
n
 Bar Code Readers
n
 Medical Instruments
n
 Low Power Portable Electronic Devices
   , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
Efficiency and Power Loss
vs Load Current, V
IN
 = 2.4V
LOAD CURRENT (mA)
30
50
80
0.01
10   100  1000
0
10
0.1   1
100
70
90
40
60
20
100
0.01
1000
1
10
0.1
3100 TA01b
BOOST
BUCK
PL, BOOST
PL, BUCK
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