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Linear Technology Electronic Components Datasheet

LTC3546 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: 2.25V 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
wwwn.DaHtiagShheEeft4cUi.econmcy: 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 2.25V 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 efficiency without external Schottky
diodes.
User-selectable modes (Burst Mode® operation, pulse
skipping and forced continuous) allow 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.
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.
TYPICAL APPLICATION
VIN
2.25V 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
VFB2
BMC2
LTC3546
RUN1
VFB1
BMC1
TRACK/SS2 TRACK/SS1
PHASE
FREQ
ITH2 ITH1
PGND2 GNDA PGND1
EXPOSED PAD
1.22μH
100pF
VIN
VIN
30.1k
30.1k
VOUT1
1.2V, 1A
22μF
13k
1000pF
10pF
3546 TA01a
VOUT2 Efficiency (Burst Mode Operation)
100
SW1D CONNECTED TO SW2
VIN = 3.6V
95 VOUT = 2.5V
100
10
90 EFFICIENCY
85
1
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
3546fb
1


Linear Technology Electronic Components Datasheet

LTC3546 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
www.DataSheet4U.com
TOP VIEW
28 27 26 25 24 23
BMC2 1
22 BMC1
TRACK/SS2 2
21 TRACK/SS1
VFB2
ITH2
VCCD
RUN2
3
4
5
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 s 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
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3546EUFD#PBF
LTC3546EUFD#TRPBF 3546
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3546IUFD#PBF
LTC3546IUFD#TRPBF 3546
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3546EFE#PBF
LTC3546EFE#TRPBF
LTC3546FE
28-Lead Plastic TSSOP
–40°C to 85°C
LTC3546IFE#PBF
LTC3546IFE#TRPBF
LTC3546FE
28-Lead Plastic TSSOP
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3546EUFD
LTC3546EUFD#TR
3546
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3546IUFD
LTC3546IUFD#TR
3546
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3546EFE
LTC3546EFE#TR
LTC3546FE
28-Lead Plastic TSSOP
–40°C to 85°C
LTC3546IFE
LTC3546IFE#TR
LTC3546FE
28-Lead Plastic TSSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3546fb
2


Part Number LTC3546
Description 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator
Maker Linear Technology
Total Page 28 Pages
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