LTC3413IFE Datasheet, PDF (1/16 Pages) Linear Technology – Monolithic Synchronous Regulator

LTC3413
3A, 2MHz Monolithic
Synchronous Regulator for
DDR/QDR Memory Termination
FEATURES
n _{High Efficiency: Up to 90%}
n _{±3A Output Current}
n _{Symmetrical Source and Sink Output Current Limit}
n _{Low RDS(ON) Internal Switch: 85mΩ}
n _{No Schottky Diode Required}
n _{2.25V to 5.5V Input Voltage Range}
n _{VOUT = VREF/2}
n _{±1% Output Voltage Accuracy}
n _{Programmable Switching Frequency: Up to 2MHz}
n _{Power Good Output Voltage Monitor}
n _{Overtemperature Protected}
n _{Available in 16-Lead TSSOP Exposed Pad Package}
APPLICATIONS
n _{Bus Termination: DDR and QDR™ Memory,}
SSTL, HSTL, ...
n _{Notebook Computers}
n _{Distributed Power Systems}
DESCRIPTION
The LTC^®3413 is a high efficiency monolithic synchro-
nous step-down DC/DC converter utilizing a constant
frequency, current mode architecture. It operates from
an input voltage range of 2.25V to 5.5V and provides a
regulated output voltage equal to (0.5)V_REF while sourcing
or sinking up to 3A of output current. An internal voltage
divider reduces component count and eliminates the need
for external resistors by dividing the reference voltage in
half. The internal synchronous power switch with 85mΩ
on-resistance increases efficiency and eliminates the need
for an external Schottky diode. Switching frequencies up
to 2MHz are set by an external resistor.
Forced-continuous operation in the LTC3413 reduces
noise and RF interference. Fault protection is provided
by an overcurrent comparator that limits output current
during both sourcing and sinking operations. Adjustable
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178.
TYPICAL APPLICATION
V_IN
2.5V
22μF
4.7M
330pF
5.11k
2200pF
SV_IN PV_IN
PGOOD
V_REF
SW
LTC3413
RUN/SS PGND
SGND
I_TH
R_T
V_FB
L1
0.47μH
C_OUT
100μF
s2
309k
3413 F01a
L1: VISHAY DALE IHLP-2525CZ-01 0.47
C_OUT: TDK C4532X5R0J107M
V_OUT
1.25V
±3A
Figure 1a. High Efficiency Bus Termination Supply
100
90
V_IN = 2.5V
f = 1MHz
80
70
60
50
40
30
20
10
0
0.01
0.1
1
LOAD CURRENT (A)
10
3413 F01b
Figure 1b. Efficiency vs Load Current
3413fc
1