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Linear Technology Electronic Components Datasheet

LTC3568EDD Datasheet

Synchronous Step-Down DC/DC Converter

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Features
n Uses Tiny Capacitors and Inductor
n High Frequency Operation: Up to 4MHz
n Low RDS(ON) Internal Switches: 0.110Ω
n High Efficiency: Up to 96%
n Stable with Ceramic Capacitors
n Current Mode Operation for Excellent Line
and Load Transient Response
n Short-Circuit Protected
n Low Dropout Operation: 100% Duty Cycle
n Low Shutdown Current: IQ ≤ 1µA
n Low Quiescent Current: 60µA
n Output Voltages from 0.8V to 5V
n Selectable Burst Mode® Operation
n Sychronizable to External Clock
n Small 3mm × 3mm, 10-Lead DFN Package
Applications
n Notebook Computers
n Digital Cameras
n Cellular Phones
n Handheld Instruments
n Board Mounted Power Supplies
LTC3568
1.8A, 4MHz, Synchronous
Step-Down DC/DC Converter
Description
The LTC®3568 is a constant frequency, synchronous
step- down DC/DC converter. Intended for medium power
applications, it operates from a 2.5V to 5.5V input voltage
range and has a user configurable operating frequency
up to 4MHz, allowing the use of tiny, low cost capacitors
and inductors 2mm or less in height. The output voltage
is adjustable from 0.8V to 5V. Internal sychronous 0.11Ω
power switches with 2.4A peak current ratings provide
high efficiency. The LTC3568’s current mode architecture
and external compensation allow the transient response
to be optimized over a wide range of loads and output
capacitors.
The LTC3568 can be configured for automatic power sav-
ing Burst Mode operation to reduce gate charge losses
when the load current drops below the level required for
continuous operation. For reduced noise and RF interfer-
ence, the SYNC/MODE pin can be configured to skip pulses
or provide forced continuous operation.
To further maximize battery life, the P-channel MOSFET
is turned on continuously in dropout (100% duty cycle)
with a low quiescent current of 60µA. In shutdown, the
device draws <1µA.
L, LT, LTC, LTM, Linear Technology, the Linear logo, OPTI-LOOP and Burst Mode are
registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 6580258, 6304066, 6127815, 6611131.
Typical Application
VIN
2.5V TO 5.5V
13k
1000pF
VIN SYNC/MODE
PVIN
PGOOD
SVIN
LTC3568 SW
ITH
SHDN/RT
VFB
SGND PGND
324k
22µF
L1
2µH
887k
VOUT
2.5V/1.8A
22µF + 10µF
412k
NOTE: IN DROPOUT, THE OUTPUT TRACKS
THE INPUT VOLTAGE
3568 F01
Figure 1. Step-Down 1.8A Regulator
Efficiency vs Load Current
100
1000
95
EFFICIENCY
90
100
85
POWER LOSS
80
10
VIN = 3.3V
VOUT = 2.5V
75
fO = 1MHz
Burst Mode
70
OPERATION 1
1
10
100
1000 10000
LOAD CURRENT (mA)
3568 TA01
3568fa



Linear Technology Electronic Components Datasheet

LTC3568EDD Datasheet

Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3568
Absolute Maximum Ratings
(Note 1)
PVIN, SVIN Voltages...................................... –0.3V to 6V
VFB, ITH, SHDN/RT Voltages.......... –0.3V to (VIN + 0.3V)
SYNC/MODE Voltage..................... –0.3V to (VIN + 0.3V)
SW Voltage.................................... –0.3V to (VIN + 0.3V)
PGOOD Voltage............................................ –0.3V to 6V
Operating Junction Temperature Range
(Note 2).............................................. –40°C to 125°C
Junction Temperature (Notes 5, 8)........................ 125°C
Storage Temperature Range................... –65°C to 125°C
Pin Configuration
TOP VIEW
SHDN/RT 1
SYNC/MODE 2
SGND 3
SW 4
PGND 5
10 ITH
9 VFB
11
8 PGOOD
7 SVIN
6 PVIN
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3568EDD#PBF
LTC3568EDD#TRPBF
LCSG
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3568IDD#PBF
LTC3568IDD#TRPBF
LCSG
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3568EDD
LTC3568EDD#TR
LCSG
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3568IDD
LTC3568IDD#TR
LCSG
10-Lead (3mm × 3mm) Plastic DFN
–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/
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, RT = 324k unless otherwise specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Operating Voltage Range
IFB
Feedback Pin Input Current
VFB
Feedback Voltage
(Note 3)
LTC3568E (Note 3)
LTC3568I (Note 3)
2.25
5.5
V
±0.1
µA
l 0.784
0.8
0.816
V
l 0.780
0.8
0.816
V
ΔVLINEREG
Reference Voltage Line Regulation
VIN = 2.25V to 5V
ΔVLOADREG Output Voltage Load Regulation
ITH = 0.36, (Note 3)
l
ITH = 0.84, (Note 3)
l
gm(EA)
Error Amplifier Transconductance
ITH Pin Load = ±5µA (Note 3)
IS
Input DC Supply Current (Note 4)
Active Mode
VFB = 0.75V, SYNC/MODE = 3.3V
Sleep Mode
VSYNC/MODE = 3.3V, VFB = 1V
Shutdown
VSHDN/RT = 3.3V
VSHDN/RT
Shutdown Threshold High
Active Oscillator Resistor
0.04
0.2
%/V
0.02
0.2
%
–0.02
–0.2
%
800
µS
240
350
µA
62
100
µA
0.1
1
µA
VIN – 0.6 VIN – 0.4
V
324k
1M
Ω
3568fa



Part Number LTC3568EDD
Description Synchronous Step-Down DC/DC Converter
Maker Linear
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