LTC3428
4A, 2MHz Dual Phase
Step-Up DC/DC Converter
in 3mm
脳
3mm DFN
DESCRIPTIO
The LTC
廬
3428 is a 2-phase, current mode boost con-
verter, capable of supplying 2A at 5V from a 3.3V input.
Two 93m鈩? 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 switch-
ing 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 1碌A(chǔ), internal soft-start,
antiringing control and thermal shutdown. The LTC3428
is available in a low profile (0.75mm) 10-lead (3mm
脳
3mm) DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
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High Efficiency: Up to 92%
2-Phase Control Reduces Output Voltage Ripple
5V at 2A from 3.3V Input
3.3V at 1.5A from 1.8V Input
1.6V to 5.25V Adjustable Output Voltage
1.6V to 4.5V Input Range
Internal Soft-Start Operation
Low Shutdown Current: <1碌A(chǔ)
Uses Small Surface Mount Components
10-Pin 3mm
脳
3mm DFN Package
APPLICATIO S
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Networking Equipment
Handheld Instruments
Digital Cameras
Distributed Power
Local 3.3V to 5V Conversion
TYPICAL APPLICATIO
3.3V to 5V at 2A Converter
95
V
IN
3.3V
2.2碌H*
V
IN
OFF ON
10k
1000pF
22pF
SHDN
V
C
AGND
PGNDA
LTC3428
V
OUT
SWA
SWB
FB
PGNDB
22碌F****
3428 TA01
EFFICIENCY (%)
4.7碌F***
2.2碌H*
V
OUT
5V/2A
**
383k
**
121k
* TOKO FDV06302R2
** PHILIPS PMEG1020
*** TAIYO YUDEN X5R JMK212BJ475MD
**** TAIYO YUDEN X5R JMK316BJ226ML
U
U
U
Efficiency vs Load Current
90
85
80
75
70
65
60
55
50
45
0.1
LOAD CURRENT (A)
3428 TA02
V
IN
= 3.3V
V
OUT
= 5V
L = 2.2碌H
1
2
3428f
1
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