參數(shù)資料
型號(hào)： LTC3546IUFD#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 4 X 5 MM, PLASTIC, MO-220, QFN-28
文件頁(yè)數(shù)： 1/28頁(yè)
文件大小： 356K
代理商： LTC3546IUFD#TR
LTC3546
1
3546fb
LOAD CURRENT (A)
0.001
0.01
EFFICIENCY
(%)
POWER
LOSS
(W)
100
80
75
95
90
85
70
100
10
1
0.1
0.01
0.0001
0.001
1
3546 TA01b
10
0.1
SW1D CONNECTED TO SW2
VIN = 3.6V
VOUT = 2.5V
EFFICIENCY
POWER LOSS
3546 TA01a
LTC3546
PGOOD1
SW1
RUN1
VFB1
BMC1
TRACK/SS1
FREQ
ITH1
PGOOD2
SW2A
RUN2
VFB2
BMC2
TRACK/SS2
PHASE
ITH2
22μF
1000pF
10pF
VIN1
VIN
VOUT1
1.2V, 1A
VIN
VCCA VCCD VIN2
PGND2
EXPOSED PAD
GNDA
PGND1
1.22μH
68μF
VOUT2
2.5V, 3A
VIN
2.25V TO
5.5V
0.56μH
SYNC/MODE
SW2B
SW1D
VIN
CIN
22μF
100pF
1000pF
13k
30.1k
95.3k
100pF
30.1k
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Synchronous, 3A/1A
or 2A/2A Congurable
Step-Down DC/DC Regulator
The LTC3546 is a dual, constant-frequency, synchronous
stepdownDC/DCconverterformediumpowerapplications.
The design consists of 2A and 1A primary output switches.
In addition to the 2A/1A capability, a 1A dependant output
switch can be externally connected to either of the primary
outputs to produce 3A/1A dual regulator or 2A/2A dual
regulator congurations.
Supply operation is from 2.25V to 5.5V. The switching
frequency can be set to 2.25MHz, adjustable 0.75MHz to
4MHz, or synchronized to an external clock. Each output
is adjustable from 0.6V to 5V and has output tracking
on power-up. Internal synchronous low RDS(ON) power
switches provide high efciency without external Schottky
diodes.
User-selectable modes (Burst Mode operation, pulse
skipping and forced continuous) allow trade-off between
ripple noise and power efciency. Burst Mode operation
provides high efciency at light loads. Pulse-skipping
mode provides low ripple noise at light loads.
The device is capable of low dropout congurations and
both channels can operate at 100% duty cycle. In shut-
down, the device draws <1μA.
n VIN Range: 2.25V to 5.5V
n VOUT Range: 0.6V to 5V
n Programmable Frequency Operation; 2.25MHz, or
Adjustable Between 0.75MHz to 4MHz
n Low RDS(ON) Internal Switches
n High Efciency: Up to 96%
n No Schottky Diodes Required
n Short-Circuit Protected
n Current Mode Operation for Excellent Line and Load
Transient Response
n Low Ripple Burst Mode Operation (30mVP-P),
IQ = 160μA
n Ultralow Shutdown Current: IQ < 1μA
n Low Dropout Operation: 100% Duty Cycle
n Power Good Output For Each Channel
n Externally or Internally Programmable Burst Level
n External or Internal Soft-Start or Supply Tracking
n Available in Thermally Enhanced 28-Lead
(4mm × 5mm) QFN and TSSOP Packages
n Netbooks/Ultra-Mobile PCs
n PC Cards
n Wireless and DSL Modems
n Point of Load DC/DC Conversion
VOUT2 Efciency (Burst Mode Operation)
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3546IUFDTRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator
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LTC3547B 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic 300mA Synchronous Step-Down Regulator
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