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Linear Technology Electronic Components Datasheet

LTC3545 Datasheet

Triple 800mA Synchronous Step-Down Regulator-2.25MHz

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LTC3545/LTC3545-1
Triple 800mA Synchronous
Step-Down Regulator–2.25MHz
FEATURES
DESCRIPTION
Three 800mA Outputs
High Efficiency: Up to 95%
2.25V to 5.5V Input Voltage Range
Low Ripple (<20mVP-P) Burst Mode® Operation
IQ: 58μA
2.25MHz Constant Frequency Operation or
Synchronizable to External 1MHz to 3MHz Clock
www.DaPtoawSheereGt4oUo.cdomIndicators Ease Supply Sequencing
0.6V Reference Allows Low Output Voltages
Current Mode Operation/Excellent Transient Response
Low Profile 16-Lead 3mm × 3mm QFN Package
APPLICATIONS
Smart Phones
Wireless and DSL Modems
Digital Still Cameras
Portable Instruments
Point of Load Regulation
L, LT, LTC, LTM 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 6580258, 5481178, 6127815, 6498466, 6611131.
The LTC®3545/LTC3545-1 are triple, high efficiency,
monolithic synchronous buck regulators using a constant
frequency, current mode architecture. The regulators op-
erate independently with separate run pins. The 2.25V to
5.5V input voltage range makes the LTC3545/LTC3545-1
well suited for single Li-Ion battery-powered applications.
Low ripple pulse skip mode or high efficiency Burst Mode
operation is externally selectable. PWM pulse skip mode
operation provides very low output ripple voltage while
Burst Mode operation increases efficiency at low output
loads.
Switching frequency is internally set to 2.25MHz, or the
switching frequency can be synchronized to an external
1MHz to 3MHz clock. Power good indicators easily allow
power on sequencing between the three regulators.
The internal synchronous switches increase efficiency and
eliminate external Schottky diodes. Low output voltages are
supported with the 0.6V feedback reference voltage.
The LTC3545-1 replaces the SYNC/MODE function with a
third PGOOD pin and forces Burst Mode operation.
TYPICAL APPLICATION
High Efficiency Triple Step-Down Converter with Power Sequencing
VOUT1
1.8V
C1
10μF
VIN
2.25V TO 5.5V
C4 10μF
C5
10μF
GNDA
R8 R7
500k 500k
RUN1
VIN PVIN
PGND
L2
1.5μH
SW2
PGOOD1
RUN2
PGOOD2
VFB2
R4
226k
RUN3 LTC3545
L1
1.5μH
C6
20pF
SYNC/MODE
SW1
L3
1.5μH
SW3
R1
511k
VFB1
R2 GNDA
255k
VFB3
PGND
R6
200k
C7
20pF
R3
226k
C8
20pF
R5
301k
VOUT2
1.2V
C2
10μF
VOUT3
1.5V
C3
10μF
3545 TA01
Efficiency and Loss vs Load Current
100 1
90
80
0.1
70
60
50 0.01
40
30
20
10
0
0.0001
0.001
0.001
0.01
VIN = 2.5V
VIN = 3.6V
VIN = 4.2V
0.0001
0.1 1
LOAD CURRENT (A)
TA = 25°C
VOUT = 2V
Burst Mode OPERATION
fOSC = 2.25MHz
SINGLE CHANNEL
3545 TA01b
35451fb
1


Linear Technology Electronic Components Datasheet

LTC3545 Datasheet

Triple 800mA Synchronous Step-Down Regulator-2.25MHz

No Preview Available !

LTC3545/LTC3545-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage.................................... –0.3V to 6V
RUNx, PGOODx............................. –0.3V to (VIN + 0.3V)
VFBx, SYNC/MODE ........................ –0.3V to (VIN + 0.3V)
SWx .............................................. –0.3V to (VIN + 0.3V)
P-Switch Source Current (DC) (Note 8) ...................1.1A
N-Channel Sink Current (DC) (Note 8) .....................1.1A
Peak SW Sink and Source Current (Note 8) .............1.3A
Operating Junction Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
PIN CONFIGURATION
LTC3545
www.DataSheet4U.com
TOP VIEW
16 15 14 13
SW1 1
12 VFB2
PGOOD1 2 17 11 VFB3
RUN2 3
10 RUN3
PGOOD2 4
9 SYNC/MODE
5678
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 55°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
LTC3545-1
TOP VIEW
16 15 14 13
SW1 1
12 VFB2
PGOOD1 2 17 11 VFB3
RUN2 3
10 RUN3
PGOOD2 4
9 PGOOD3
5678
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 55°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3545EUD#PBF
LTC3545EUD#TRPBF
LCSR
16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC3545IUD#PBF
LTC3545IUD#TRPBF
LCSR
16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC3545EUD-1#PBF
LTC3545EUD-1#TRPBF LDDP
16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
LTC3545IUD-1#PBF
LTC3545IUD-1#TRPBF LDDP
16-Lead (3mm × 3mm) Plastic QFN –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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = PVIN = 3.6V unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
General Characteristics
VIN
VFBx
ΔVFBx
Input Voltage Range
Regulated Feedback Voltage (Note 5)
Reference Voltage Line Regulation (Note 5)
TA = 25°C
0°C ≤ TA ≤ 85°C
LTC3545IUD; –40°C < TA < 125°C
VIN = 2.25V to 5.5V
2.25
5.5 V
0.592 0.6 0.608
0.588 0.6 0.612
0.588 0.6 0.612
0.08 0.15
V
V
V
%/V
35451fb
2


Part Number LTC3545
Description Triple 800mA Synchronous Step-Down Regulator-2.25MHz
Maker Linear Technology
Total Page 20 Pages
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