LTC3314A
5V, Dual 4A/Dual-Phase 8A Step-Down
DC/DC Regulator in 2.2mm × 2.7mm WLCSP
FEATURES
DESCRIPTION
The LTC®3314A features dual monolithic synchronous 4A
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Dual 4A Outputs
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step-down converters in a 2.2mm × 2.7mm package for
space saving applications with demanding performance
requirements. Using a constant frequency, peak current
mode architecture at switching frequencies up to 3MHz,
both bucks achieve high efficiency and fast transient
response with small external components. The LTC3314A
can also be configured as a single output, 2-phase 8A
step-down converter.
Configurable as Single Output, 2-Phase 8A Buck
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High Efficiency: 12mΩ High-Side and 8mΩ Low-Side
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1ꢀ Maꢁimum ꢂotal DC Output Error
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Wide Bandwidth, Fast ꢂransient Response
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V Range: 2.25V to 5.5V
IN
OUT
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n
n
n
n
n
n
n
V
Range: 0.5V to V
IN
Programmable Frequency to 3MHz
Low Ripple Burst Mode® Operation with Low I
Shutdown Current: 1.4µA
35ns Minimum On-Time
Internal Compensation
Precision Enable, Power Good for Power Sequencing
Tiny 30-Lead, 2.2mm × 2.7mm WLCSP Package
Q
The LTC3314A operates in forced continuous or pulse-
skipping mode for low noise, or in Burst Mode operation
for high efficiency at light loads. The common switching
frequency is set to a default 2MHz, programmed with an
external resistor, or synchronized to an external oscillator
via the MODE/SYNC pin. To reduce input ripple current,
the dual converters switch 180 degrees out of phase.
APPLICATIONS
With an input range of 2.25V to 5.5V the LTC3314A regu
-
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Servers, Telecom Power Supplies, Optical Networking
lates to outputs as low as 500mV. Other features include
precision enable thresholds, PGOOD signals, output over-
voltage protection, thermal shutdown, and output short-
circuit protection. The device is available in a 30-lead,
2.2mm × 2.7mm WLCSP package.
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Distributed DC Power Systems (POL)
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FPGA, ASIC, µP Core Supplies
Industrial/Automotive/Communications
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All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
Efficiency and Power Loss in
Burst Mode Operation
Dual 2MHz 4A Buck Regulators
100
90
80
70
60
50
10
220nH
V
V
IN
OUT1
SW1
BST1
FB1
PV
IN1
2.25 TO 5.5V
1.2V, 4A
22nF
EFFICIENCY
1
10μF
LTC3314A
140k
100k
10pF
33μF
×2
0.1
EN1
AV
PGOOD1
PGOOD2
40 POWER LOSS
0.01
0.001
0.0001
IN
1μF
30
20
10
0
MODE/SYNC
RT
330nH
22nF
V
OUT2
SW2
BST2
FB2
V
OUT
SW
= 3.3V
IN
1.8V, 4A
V
= 1.2V
EN2
f
= 2MHz
107k
10pF
33μF
×2
TDK TFM252012ALMAR22MTAA
PV
IN2
0.001
0.01
0.1
1
4
10μF
LOAD CURRENT (A)
41.2k
3314A TA01b
AGND
PGND
3314A TA01a
Rev. 0
1
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