LTC1504_15 Datasheet, PDF (1/12 Pages) Linear Technology – 500mA Low Voltage Step-Down Synchronous Switching Regulator

Final Electrical Specifications
LTC1504
500mA Low Voltage
Step-Down Synchronous
Switching Regulator
FEATURES
s _{500mA Output Current at 3.3V Output}
s _{Up to 92% Peak Efficiency}
s _{Internal Reference Trimmed to 1%}
s _{Output Can Source or Sink Current}
s _{Requires as Few as Four External Components}
s _{Input Voltage Range: 4V to 10V}
s _{Adjustable Current Limit}
s _{Small SO-8 Package}
s _{200kHz Switching Frequency Can be}
Synchronized Up to 500kHz
U
APPLICATIONS
s _{Small Portable DigDitaaisl yS-Cyhsateinmeds Control Outputs}
s _{Active Termination}
s _{Auxiliary Output Voltage Supplies}
s _{Minimum Part Count/Size Switchers}
DESCRIPTION
The LTC^®1504 is a self-contained, high efficiency syn-
chronous buck switching regulator. It includes a pair of
on-chip 1.5Ω power switches, enabling it to supply up to
500mA of load current. Efficiency peaks at 92%, minimiz-
ing heat and wasted power. The synchronous buck archi-
tecture allows the output to source or sink current as
required to keep the output voltage in regulation.
The LTC1504 is available in adjustable and fixed 3.3V
output versions. An adjustable current limit circuit pro-
vides protection from overloads. The internal 1% refer-
ence combined with a sophisticated voltage feedback loop
provides optimum output voltage accuracy and fast load
transient response. The LTC1504 is specified to operate
with input voltages between 4V and 10V. Contact the LTC
factory for guaranteed specifications at 2.7V supply.
The LTC1504 is available in a plastic SO-8 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Minimum Part Count 5V to 3.3V Regulator
NC SHUTDOWN
5V ₊
C_IN
C_IN: AVX TPSC226M016R0375
C_OUT: AVX TAJC476M010
L_EXT: COILTRONICS CTX50-1P
I_MAX
V_CC
SHDN
SW
LTC1504-3.3
GND
SENSE
SS
COMP
L_EXT
+
NC
1000pF
3.3V AT 500mA
C_OUT
1504 • TA01
100
90
80
70
60
50
40
30
20
10
0
10
5V to 3.3V Efficiency
100
LOAD CURRENT (mA)
500
1504 • TA02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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