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LTC3546IUFD Datasheet

3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator

No Preview Available !

LTC3546
Dual Synchronous, 3A/1A
or 2A/2A Configurable
Step-Down DC/DC Regulator
FEATURES
n VIN Range: 2.3V 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 Efficiency: 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
APPLICATIONS
n Netbooks/Ultra-Mobile PCs
n PC Cards
n Wireless and DSL Modems
n Point of Load DC/DC Conversion
DESCRIPTION
The LTC®3546 is a dual, constant-frequency, synchronous
step down DC/DC converter for medium power applications.
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 configurations.
Supply operation is from 2.3V to 5.5V. The switching fre-
quency can be set to 2.25MHz, adjustable from 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 efficiency without external
Schottky diodes.
User-selectable modes (Burst Mode® operation, pulse
skipping and forced continuous) allow a trade-off between
ripple noise and power efficiency. Burst Mode operation
provides high efficiency at light loads. Pulse-skipping
mode provides low ripple noise at light loads.
The device is capable of low dropout configurations and
both channels can operate at 100% duty cycle. In shut-
down, the device draws <1µA.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
TYPICAL APPLICATION
VIN
3.6V TO
5.5V
VOUT2
2.5V, 3A
68µF
CIN
22µF
0.56µH
100pF
95.3k
VIN
30.1k VIN
13k
10pF
1000pF
VIN1 VCCA VCCD VIN2
SYNC/MODE
PGOOD2
PGOOD1
SW2A
SW1
SW2B
SW1D
RUN2 LTC3546 RUN1
VFB2
BMC2
VFB1
BMC1
TRACK/SS2 TRACK/SS1
PHASE
FREQ
ITH2
ITH1
PGND2 GNDA PGND1
EXPOSED PAD
1.22µH
VIN
VIN
100pF
30.1k
30.1k
VOUT1
1.2V, 1A
22µF
13k
1000pF
10pF
3546 TA01a
For more information www.linear.com/3546
VOUT2 Efficiency (Burst Mode Operation)
100
100
SW1D CONNECTED TO SW2
VIN = 3.6V
95 VOUT = 2.5V
10
90
EFFICIENCY
1
85
0.1
80
0.01
POWER LOSS
75
0.001
70
0.001
0.01
0.1
1
LOAD CURRENT (A)
0.0001
10
3546 TA01b
3546fd
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3546IUFD Datasheet

3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator

No Preview Available !

LTC3546
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN1, VIN1D, VIN2, VCCA, VCCD Voltages.......... –0.3V to 6V
SYNC/MODE, SW1, SW1D, SW2A, SW2B,
RUN1, RUN2, VFB1, VFB2, PHASE, FREQ,
ITH1, ITH2, TRACK/SS1, TRACK/SS2, BMC1,
BMC2 Voltages................. –0.3V to (VIN1 or VIN2) + 0.3V
Maximum Difference Between Any of
VIN1, VIN1D, VIN2, VCCA, VCCD ...................................0.3V
PGOOD1, PGOOD2 Voltage........................... –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 6, 7)......................................... –40°C to 125°C
Storage Temperature Range.................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
BMC2 1
22 BMC1
TRACK/SS2 2
21 TRACK/SS1
VFB2 3
ITH2 4
VCCD 5
RUN2 6
20 VFB1
29
19 ITH1
18 PHASE
17 RUN1
VIN2 7
16 PGND2
VIN1 8
15 PGND1
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 29) IS GNDD
TOP VIEW
VCCA 1
SYNC/MODE 2
28 GNDA
27 FREQ
PGOOD2 3
26 PGOOD1
BMC2 4
25 BMC1
TRACK/SS2 5
24 TRACK/SS1
VFB2 6
23 VFB1
ITH2 7
29
22 ITH1
VCCD 8
21 PHASE
RUN2 9
20 RUN1
VIN2 10
VIN1 11
VIN1D 12
SW2A 13
19 PGND2
18 PGND1
17 PGND1D
16 SW1
SW2B 14
15 SW1D
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 25°C/W
EXPOSED PAD (PIN 29) IS GNDD MUST BE SOLDERED TO PCB
3546fd
2
For more information www.linear.com/3546


Part Number LTC3546IUFD
Description 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator
Maker Analog Devices
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