LTC3428_15 Datasheet, PDF (1/12 Pages) Linear Technology – 4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm 3mm DFN

FEATURES
n _{High Efficiency: Up to 92%}
n _{2-Phase Control Reduces Output Voltage Ripple}
n _{5V at 2A from 3.3V Input}
n _{3.3V at 1.5A from 1.8V Input}
n _{1.6V to 5.25V Adjustable Output Voltage}
n _{1.6V to 4.5V Input Range}
n _{Internal Soft-Start Operation}
n _{Low Shutdown Current: <1μA}
n _{Uses Small Surface Mount Components}
n _{10-Pin 3mm × 3mm DFN Package}
APPLICATIONS
n _{Networking Equipment}
n _{Handheld Instruments}
n _{Digital Cameras}
n _{Distributed Power}
n _{Local 3.3V to 5V Conversion}
LTC3428
4A, 2MHz Dual Phase
Step-Up DC/DC Converter
in 3mm × 3mm DFN
DESCRIPTION
The LTC^®3428 is a 2-phase, current mode boost con-
verter, capable of supplying 2A at 5V from a 3.3V input.
Two 93mΩ, 2A N-channel MOSFET switches allow the
LTC3428 to deliver high efficiency from input voltages as
low as 1.6V.
External parts count and size are minimized by a 1MHz
switching frequency and a 2-phase design. Two phase
operation significantly reduces peak inductor currents and
capacitor ripple current, doubling the effective switching
frequency and minimizing inductor and capacitor size.
External compensation allows the feedback loop response
to be optimized for a particular application.
Other features include: an active low shutdown pin re-
duces supply current to below 1μA, internal soft-start,
antiringing control and thermal shutdown. The LTC3428
is available in a low profile (0.75mm) 10-lead (3mm ×
3mm) DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V to 5V at 2A Converter
V_IN
3.3V
4.7μF***
10k
1000pF
OFF ON
22pF
V_IN
V_OUT
SHDN
SWA
V_C ^LTC3428 SWB
AGND
FB
PGNDA
PGNDB
2.2μH* 2.2μH*
**
**
22μF****
V_OUT
5V/2A
383k
121k
* TOKO FDV06302R2
** PHILIPS PMEG1020
*** TAIYO YUDEN X5R JMK212BJ475MD
**** TAIYO YUDEN X5R JMK316BJ226ML
3428 TA01
Efficiency vs Load Current
95
90
85
80
75
70
65
60
55
50
45
0.1
V_IN = 3.3V
V_OUT = 5V
L = 2.2μH
1
LOAD CURRENT (A)
2
3428 TA02
3428fb
1