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LTC3560IS6#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3560
1
3560fb
TYPICAL APPLICATION
DESCRIPTION
2.25MHz, 800mA
Synchronous Step-Down
Regulator in ThinSOT
The LTC
®
3560 is a high effi ciency monolithic synchronous
buck regulator using a constant frequency, current mode
architecture. Supply current during operation is only 16µA,
dropping to <1µA in shutdown. The 2.5V to 5.5V input
voltage range makes the LTC3560 ideally suited for single
Li-Ion/Li-Polymer battery-powered applications. 100%
duty cycle provides low dropout operation, extending
battery life in portable systems.
Switching frequency is internally set at 2.25MHz, allowing
the use of small surface mount inductors and capacitors.
For noise sensitive applications the LTC3560 can be ex-
ternally synchronized from 1MHz to 3MHz. Burst Mode
operation is inhibited during synchronization or when the
SYNC/MODE pin is pulled high, preventing low frequency
ripple from interfering with audio circuitry.
The internal synchronous switch increases effi ciency
and eliminates the need for an external Schottky diode.
Low output voltages are easily supported with the 0.6V
feedback reference voltage. The LTC3560 is available in a
low profi le (1mm) ThinSOT package.
Figure 1a. High Effi ciency Step-Down Converter
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents including 6580258, 5481178, 5994885,
6304066, 6498466, 6611131.
FEATURES
APPLICATIONS
n
High Effi ciency: Up to 95%
n
Low Output Ripple (<20mV
P-P
): Burst Mode
®
Operation: I
Q
= 16μA
n
2.5V to 5.5V Input Voltage Range
n
2.25MHz Constant Frequency Operation
n
Synchronizable to External Clock
n
No Schottky Diode Required
n
Stable with Ceramic Capacitors
n
Low Dropout Operation: 100% Duty Cycle
n
0.6V Reference Allows Low Output Voltages
n
Shutdown Mode Draws <1µA Supply Current
n
±2% Output Voltage Accuracy
n
Current Mode Operation for Excellent Line and
Load Transient Response
n
Overtemperature Protected
n
Low Profi le (1mm) ThinSOT™ Package
n
Cellular Telephones
n
Wireless and DSL Modems
n
Digital Still Cameras
n
Media Players
n
Portable Instruments
Figure 1b. Effi ciency vs Load Current
V
IN
C
IN
10µF
CER
V
IN
2.7V
TO 5.5V
LTC3560
RUN
SYNC/MODE
2.2µH
10pF
806k
255k
3405A F01a
SW
V
FB
GND
C
OUT
10µF
CER
V
OUT
2.5V
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (W)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3560 F01b
0
1
0.001
0.1
0.01
0.0001
1
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
LTC3560
2
3560fb
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage ................................... –0.3V to 6V
SYNC/MODE, RUN, V
FB
Voltages ............... – 0.3V to V
IN
SW Voltage (DC) .......................... –0.3V to (V
IN
+ 0.3V)
P-Channel Switch Source Current (DC) (Note 6)..... 1.2A
N-Channel Switch Sink Current (DC) (Note 6) ........ 1.2A
Peak SW Sink and Source Current (Note 6) ........... 2.1A
Operating Temperature Range (Note 2)
LTC3560E .............................................–40°C to 85°C
LTC3560I............................................–40°C to 125°C
Junction Temperature (Notes 3, 7) ...................... 125°C
Storage Temperature Range .................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................. 300°C
(Note 1)
RUN 1
GND 2
SW 3
6 SYNC/MODE
5 V
FB
4 V
IN
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C, θ
JA
= 250°C/W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current
l
±30 nA
I
PK
Peak Inductor Current V
IN
= 3V, V
FB
= 0.5V, Duty Cycle < 35% 1.0 1.5 2.0 A
V
FB
Regulated Feedback Voltage (Note 4) E Grade
I Grade
l
l
0.588
0.582
0.6
0.6
0.612
0.618
V
V
∆V
FB
Reference Voltage Line Regulation V
IN
= 2.5V to 5.5V (Note 4) E Grade
I Grade
l
l
0.04
0.04
0.4
0.8
%/V
%/V
V
LOADREG
Output Voltage Load Regulation 0.5 %
V
IN
Input Voltage Range
l
2.5 5.5 V
I
S
Input DC Bias Current
Pulse-Skipping Mode
Burst Mode Operation
Shutdown
(Note 5)
V
FB
= 0.63V, Mode = High, I
LOAD
= 0A
V
FB
= 0.63V, Mode = Low, I
LOAD
= 0A
V
RUN
= 0V, V
IN
= 5.5V
200
16
0.1
300
30
1
µA
µA
µA
f
OSC
Oscillator Frequency V
FB
= 0.6V
l
1.8 2.25 2.7 MHz
f
SYNC
SYNC Frequency Range
l
13MHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA 0.23 0.35 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –100mA 0.21 0.35 Ω
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 5.5V, V
IN
= 5.5V ±0.01 ±1 µA
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3560ES6#PBF LTC3560ES6#TRPBF LTCFY 6-Lead Plastic TSOT-23 –40°C to 85°C
LTC3560IS6#PBF LTC3560IS6#TRPBF LTCFY 6-Lead Plastic TSOT-23 –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V unless otherwise specifi ed.
LTC3560
3
3560fb
ELECTRICAL CHARACTERISTICS
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 LTC3560E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3560I is guaranteed to meet
specifi ed performance specifi cations over the full –40°C to 125°C
operating temperature range.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3560: T
J
= T
A
+ (P
D
)(250°C/W)
Note 4: The LTC3560 is tested in a proprietary test mode that connects V
FB
to the output of the error amplifi er.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Guaranteed by long-term current density limitations.
Note 7: 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 specifi ed maximum operating junction
temperature may impair device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Effi ciency vs Input Voltage Effi ciency vs Output Current Effi ciency vs Output Current
INPUT VOLTAGE (V)
2.5
50
EFFICIENCY (%)
60
70
80
3
3.5
4 4.5
3560 G01
5
90
100
55
65
75
85
95
5.5
I
OUT
= 100mA
I
OUT
= 0.1mA
V
OUT
= 1.8V
I
OUT
= 1mA
I
OUT
= 900mA
I
OUT
= 10mA
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3560 G02
0
1
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
V
OUT
= 3.3V
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3560 G03
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.5V
V
OUT
= 1.8V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RUN
RUN Threshold
l
0.3 1 1.5 V
I
RUN
RUN Leakage Current
l
±0.01 ±1 µA
V
SYNC/MODE
SYNC/MODE Threshold
l
0.3 1.0 1.5 V
I
SYNC/MODE
SYNC/MODE Leakage Current
l
±0.01 ±1 µA
t
SOFTSTART
Soft-Start Time V
FB
from 10% to 90% Full Scale 0.6 0.9 1.2 ms
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V unless otherwise specifi ed.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3560IS6#TRMPBF

Mfr. #:
Buy LTC3560IS6#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2.25MHz, 800mA Sync Buck Reg in SOT
Lifecycle:
New from this manufacturer.
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