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PDF LTC3428 Data sheet ( Hoja de datos )
| Número de pieza | LTC3428 | |
| Descripción | 2MHz Dual Phase Step-Up DC/DC Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 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: <1µA
■ Uses Small Surface Mount Components
■ 10-Pin 3mm × 3mm DFN Package
U
APPLICATIO S
■ Networking Equipment
■ Handheld Instruments
■ Digital Cameras
■ Distributed Power
■ Local 3.3V to 5V Conversion
TYPICAL APPLICATIO
LTC3428
4A, 2MHz Dual Phase
Step-Up DC/DC Converter
in 3mm × 3mm DFN
DESCRIPTIO
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 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 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
3.3V to 5V at 2A Converter
VIN
3.3V
4.7µF***
10k
1000pF
OFF ON
22pF
VIN VOUT
SHDN
SWA
VC LTC3428 SWB
AGND
FB
PGNDA
PGNDB
2.2µH* 2.2µH*
**
**
22µF****
VOUT
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
VIN = 3.3V
VOUT = 5V
L = 2.2µH
1
LOAD CURRENT (A)
2
3428 TA02
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BLOCK DIAGRA
LTC3428
FB
FB
ERROR AMPLIFIER/SOFT-START
VIN –
VC
+ 1.243V
ISENB
RAMP/
SLOPE COMP
CLK B
OSCILLATOR
SHDN
VC
AGND
CLK A
RAMP/
SLOPE COMP
SHUTDOWN
ISENA
5pF
–
–
PWM
COMP
+
CHANNEL B
CHANNEL A
CURRENT
LIMIT
ISENB
PWM
LOGIC
DRIVER
TSD
+
–
PWM
COMP
–
PWM
LOGIC
DRIVER
CURRENT
LIMIT
ISENA
VOUT
SWB
PGNDB
SWA
PGNDA
3428 BD
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PACKAGE DESCRIPTIO
LTC3428
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699)
0.675 ±0.05
R = 0.115
TYP
6
0.38 ± 0.10
10
3.50 ±0.05
1.65 ±0.05
2.15 ±0.05 (2 SIDES)
3.00 ±0.10 1.65 ± 0.10
(4 SIDES) (2 SIDES)
0.25 ± 0.05
0.50
BSC
2.38 ±0.05
(2 SIDES)
PIN 1
PACKAGE TOP MARK
OUTLINE (SEE NOTE 6)
0.200 REF
0.75 ±0.05
0.00 – 0.05
(DD10) DFN 1103
51
0.25 ± 0.05
0.50 BSC
2.38 ±0.10
(2 SIDES)
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
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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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3428.PDF ] | |
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