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LTC3568EDD#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC3568
1
3568fa
Typical applicaTion
FeaTures
applicaTions
DescripTion
1.8A, 4MHz, Synchronous
Step-Down DC/DC Converter
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.
n
Uses Tiny Capacitors and Inductor
n
High Frequency Operation: Up to 4MHz
n
Low R
DS(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: I
Q
≤ 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
n
Notebook Computers
n
Digital Cameras
n
Cellular Phones
n
Handheld Instruments
n
Board Mounted Power Supplies
Efficiency vs Load Current
Figure 1. Step-Down 1.8A Regulator
SYNC/MODEV
IN
LTC3568
PV
IN
SW
SV
IN
PGOOD
I
TH
SHDN/R
T
PGNDSGND
V
FB
L1
2µH
V
OUT
2.5V/1.8A
V
IN
2.5V TO 5.5V
887k
412k
1000pF
3568 F01
22µF + 10µF
13k
22µF
324k
NOTE: IN DROPOUT, THE OUTPUT TRACKS
THE INPUT VOLTAGE
LOAD CURRENT (mA)
EFFICIENCY (%)
100
95
90
85
80
75
70
POWER LOSS (mW)
1000
100
10
1
1 100 100001000
3568 TA01
10
V
IN
= 3.3V
V
OUT
= 2.5V
f
O
= 1MHz
Burst Mode
OPERATION
EFFICIENCY
POWER LOSS
LTC3568
2
3568fa
elecTrical characTerisTics
absoluTe MaxiMuM raTings
PV
IN
, SV
IN
Voltages ..................................... –0.3V to 6V
V
FB
, I
TH
, SHDN/R
T
Voltages .......... –0.3V to (V
IN
+ 0.3V)
SYNC/MODE Voltage .................... –0.3V to (V
IN
+ 0.3V)
SW Voltage ................................... –0.3V to (V
IN
+ 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
(Note 1)
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, R
T
= 324k unless otherwise specified. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage Range 2.25 5.5 V
I
FB
Feedback Pin Input Current (Note 3) ±0.1 µA
V
FB
Feedback Voltage LTC3568E (Note 3)
LTC3568I (Note 3)
l
l
0.784
0.780
0.8
0.8
0.816
0.816
V
V
ΔV
LINEREG
Reference Voltage Line Regulation V
IN
= 2.25V to 5V 0.04 0.2 %/V
ΔV
LOADREG
Output Voltage Load Regulation I
TH
= 0.36, (Note 3)
I
TH
= 0.84, (Note 3)
l
l
0.02
–0.02
0.2
–0.2
%
%
g
m(EA)
Error Amplifier Transconductance I
TH
Pin Load = ±5µA (Note 3) 800 µS
I
S
Input DC Supply Current (Note 4)
Active Mode
Sleep Mode
Shutdown
V
FB
= 0.75V, SYNC/MODE = 3.3V
V
SYNC/MODE
= 3.3V, V
FB
= 1V
V
SHDN/RT
= 3.3V
240
62
0.1
350
100
1
µA
µA
µA
V
SHDN/RT
Shutdown Threshold High
Active Oscillator Resistor
V
IN
– 0.6
324k
V
IN
– 0.4
1M
V
Ω
pin conFiguraTion
TOP VIEW
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
10
11
9
6
7
8
4
5
3
2
1
I
TH
V
FB
PGOOD
SV
IN
PV
IN
SHDN/R
T
SYNC/MODE
SGND
SW
PGND
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 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/
LTC3568
3
3568fa
f
OSC
Oscillator Frequency R
T
= 324k
(Note 7)
0.85 1 1.15
4
MHz
MHz
f
SYNC
Synchronization Frequency (Note 7) 0.4 4 MHz
I
LIM
Peak Switch Current Limit I
TH
= 1.3 2.4 3 4 A
R
DS(ON)
Top Switch On-Resistance (Note 6) V
IN
= 3.3V 0.11 0.15
Ω
Bottom Switch On-Resistance (Note 6) V
IN
= 3.3V 0.11 0.15
Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 6V, V
ITH/RUN
= 0V, V
FB
= 0V 0.01 1 µA
V
UVLO
Undervoltage Lockout Threshold V
IN
Ramping Down 2 2.25 V
PGOOD Power Good Threshold V
FB
Ramping Up, SHDN/R
T
= 1V
V
FB
Ramping Down, SHDN/R
T
= 1V
6.8
–7.6
%
%
RPGOOD Power Good Pull-Down On-Resistance 118 200
Ω
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, R
T
= 324k unless otherwise specified. (Note 2)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note
2: The LTC3568 is tested under pulsed load conditions such that T
J
=
T
A
. The LTC3568E is guaranteed to meet performance specifications from
0°C to 85°C. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3568I is guaranteed over the
full –40°C to 125°C operating junction temperature range. The maximum
ambient temperature is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistors and
other environmental factors.
Note
3: The LTC3568 is tested in a feedback loop which servos V
FB
to the
midpoint for the error amplifier (V
ITH
= 0.6V).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note
5: T
J
is calculated from the ambient T
A
and power dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• 43°C/W)
Note 6: Switch on-resistance is guaranteed by correlation to wafer level
measurements.
Note
7: 4MHz operation is guaranteed by design but not production tested
and is subject to duty cycle limitations (see Applications Information).
Note
8: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC3568EDD#TRPBF

Mfr. #:
Buy LTC3568EDD#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 1.8A, 4MHz, Sync Buck DC/DC Conv
Lifecycle:
New from this manufacturer.
Delivery:
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