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LTC1707 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1707
Description  High Efficiency Monolithic Synchronous Step-Down Switching Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1707 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC1707
High Efficiency Monolithic
Synchronous Step-Down
Switching Regulator
Figure 1b. Efficiency vs Output Load Current
22
µF
16V
47pF
VIN*
3V TO
8.5V
1707 F01a
6
2
7
1
5
8
3
SW
VREF
VFB
VIN
RUN
SYNC/MODE
ITH
LTC1707
+
15
µH
100
µF
6.3V
80.6k
*VOUT FOLLOWS VIN FOR
3V < VIN < 3.3V
249k
VOUT
3.3V
+
GND
4
OUTPUT CURRENT (mA)
1
70
90
95
100
10
100
1000
1707 F01b
85
80
75
VOUT = 3.3V
VIN = 6V
VIN = 3.6V
VIN = 8.4V
Figure 1a. High Efficiency Low Dropout Step-Down Converter
The LTC
®1707 is a high efficiency monolithic current
mode synchronous buck regulator using a fixed frequency
architecture. The operating supply range is from 8.5V
down to 2.85V, making it suitable for both single and dual
lithium-ion battery-powered applications. Burst Mode op-
eration provides high efficiency at low load currents.
100% duty cycle provides low dropout operation, extend-
ing operating time in battery-powered systems.
The switching frequency is internally set at 350kHz,
allowing the use of small surface mount inductors. For
noise sensitive applications it can be externally synchro-
nized up to 550kHz. Burst Mode operation is inhibited
during synchronization or when the SYNC/MODE pin is
pulled low preventing low frequency ripple from interfer-
ing with audio circuitry. Soft-start is provided by an
external capacitor.
The internal synchronous MOSFET switch increases effi-
ciency and eliminates the need for an external Schottky
diode, saving components and board space. Low output
voltages down to 0.8V are easily achieved due to the 0.8V
internal reference. The LTC1707 comes in an 8-lead SO
package.
s
600mA Output Current (VIN ≥ 4V)
s
High Efficiency: Up to 96%
s
Constant Frequency: 350kHz Synchronizable
to 550kHz
s
2.85V to 8.5V VIN Range
s
0.8V Feedback Reference Allows Low Voltage
Outputs: 0.8V
≤ VOUT ≤ VIN
s
No Schottky Diode Required
s
1.19V
±1% Reference Output Pin
s
Selectable Burst Mode
TM Operation/Pulse
Skipping Mode
s
Low Dropout Operation: 100% Duty Cycle
s
Precision 2.7V Undervoltage Lockout
s
Current Mode Control for Excellent Line and
Load Transient Response
s
Low Quiescent Current: 200
µA
s
Shutdown Mode Draws Only 11
µA Supply Current
s
Available in 8-Lead SO Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
s
Cellular Telephones
s
Portable Instruments
s
Wireless Modems
s
RF Communications
s
Distributed Power Systems
s
Single and Dual Cell Lithium
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO


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