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LTC3563EDC#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3563
1
3563f
500mA, Synchronous
Step-Down DC/DC Converter
with Selectable Output Voltage
The LTC
®
3563 is a high effi ciency monolithic synchro-
nous buck converter using a constant frequency, current
mode architecture. A voltage select input allows the user
to program the output voltage to 1.28V or 1.87V. Supply
current during operation is only 26µA, dropping to <1µA in
shutdown. The 2.5V to 5.5V input voltage range makes the
LTC3563 ideally suited for single Li-Ion battery-powered
applications. 100% duty cycle provides low dropout opera-
tion, extending battery life in portable systems. Internal
power switches are optimized to provide high effi ciency
and eliminate the need for an external Schottky diode.
The switching frequency is internally set at 2.25MHz,
allowing the use of small surface mount inductors and
capacitors. The LTC3563 is specifi cally designed to work
well with ceramic output capacitors, achieving very low
output voltage ripple and a small PCB footprint.
The LTC3563 is confi gured for the power saving Burst
Mode Operation.
■
Cellular Telephones
■
Wireless and DSL Modems
■
Digital Cameras
■
MP3 Players
■
PDAs and Other Handheld Devices
■
High Effi ciency: Up to 96%
■
Pin Selectable Output Voltage: 1.28V/1.87V
■
Low Ripple (<20mV
P-P
) Burst Mode
®
Operation:
I
Q
= 26µA
■
Very Low Quiescent Current: Only 26µA
■
2.5V to 5.5V Input Voltage Range
■
2.25MHz Constant Frequency Operation
■
Low Dropout Operation: 100% Duty Cycle
■
No Schottky Diode Required
■
Internal Soft-Start Limits Inrush Current
■
Shutdown Mode Draws <1µA Supply Current
■
±2% Output Voltage Accuracy
■
Current Mode Operation for Excellent Line and Load
Transient Response
■
Overtemperature Protected
■
Available in 2mm × 2mm 6-Lead DFN
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LTC, LT, 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 5481178, 6580258, 6304066, 6127815, 6498466,
6611131, 5994885.
V
IN
LTC3563
RUN
3563 TA01a
2.2µH
C
IN
10µF
CER
C
OUT
10µF
CER
SW
V
IN
2.7V TO 5.5V
V
OUT
1.28V/1.87V
500mA
V
OUT
V
SEL
GND
1.28V 1.87V
Effi ciency and Power Loss vs Output Current
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (mW)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3563 TA01b
0
100
1000
10
1
0.1
1
V
IN
= 3.6V
V
OUT
= 1.87V
LTC3563
2
3563f
Input Supply Voltage (V
IN
) ........................... –0.3V to 6V
V
OUT
, RUN Voltages .....................................–0.3V to V
IN
V
SEL
Voltage ...................................–0.3V to (V
IN
+ 0.3V)
SW Voltage ....................................–0.3V to (V
IN
+ 0.3V)
Operating Ambient Temperature Range
(Note 2) .................................................... –40°C to 85°C
Junction Temperature (Note 7) ............................. 125°C
Storage Temperature Range ................... –65°C to 125°C
Refl ow Peak Body Temperature (DFN) .................. 260°C
(Note 1)
The ● 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 noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage Range
●
2.5 5.5 V
V
OUT
Output Voltage (Note 4) V
SEL
= 0V
V
SEL
= High
●
●
1.254
1.832
1.28
1.87
1.306
1.908
V
V
ΔV
LINE_REG
Reference Voltage Line Regulation (Note 4) V
IN
= 2.5V to 5.5V 0.04 0.2 %/V
ΔV
LOAD_REG
Output Voltage Load Regulation (Note 4) I
LOAD
= 100mA to 500mA 0.2 %
I
S
Input DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown
V
OUT
= 1.1V, V
SEL
= 0V
V
OUT
= 1.4V, V
SEL
= 0V
RUN = 0V
26
0.1
500
35
1
µA
µA
µA
f
OSC
Oscillator Frequency
●
1.8 2.25 2.7 MHz
I
LIM
Peak Switch Current V
IN
= 3V, V
FB
= 0.5V, Duty Cycle < 35% 650 1000 1750 mA
R
DS(ON)
P-Channel On Resistance (Note 6)
N-Channel On Resistance (Note 6)
I
SW
= 100mA
I
SW
= 100mA
0.5
0.35
0.65
0.55
Ω
Ω
I
SW(LKG)
Switch Leakage Current V
IN
= 5V, V
RUN
= 0V, V
SW
= 0V or 5V ±0.01 ±1 µA
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
WWWU
TOP VIEW
RUN
SW
V
OUT
V
IN
GND
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
4
5
7
6
3
2
1
V
SEL
T
JMAX
= 125°C, θ
JA
= 102°C/W, θ
JC
= 20°C/W (SOLDERED TO A 4-LAYER BOARD, NOTE 3)
EXPOSED PAD (PIN 7) IS PGND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DC PART MARKING
LTC3563EDC LCSZ
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
PACKAGE/ORDER INFORMATION
LTC3563
3
3563f
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. No pin should exceed 6V.
Note 2: The LTC3563 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.
Note 3: Failure to solder the Exposed Pad of the package to the PC board
will result in a thermal resistance much higher than 40°C/W.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
UVLO
Undervoltage Lockout Threshold V
IN
Rising
V
IN
Falling 1.8
2.0
1.9
2.3 V
V
V
RUN
RUN Threshold
●
0.3 1.2 V
I
RUN
RUN Leakage Current
●
±0.01 ±1 µA
V
SEL
V
SEL
Threshold
●
0.3 1 1.2 V
R
SEL
V
SEL
Pull-Up Resistance Resistance Between V
SEL
and V
IN
1.3 2.2 3 MΩ
The ● 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 noted.
ELECTRICAL CHARACTERISTICS
Note 4: The converter is tested in a proprietary test mode that connects
the output of the error amplifi er to the SW pin, which is connected to an
external servo loop.
Note 5: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 6: The DFN switch on resistance is guaranteed by correlation to wafer
level measurements.
Note 7: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
) • (θ
JA
).
Burst Mode Operation Start-Up from Shutdown
TYPICAL PERFOR A CE CHARACTERISTICS
UW
T
A
= 25°C unless otherwise specifi ed.
SW
2V/DIV
V
IN
= 3.6V
V
OUT
= 1.87V
I
LOAD
= 30mA
2µs/DIV
3563 G01
V
OUT
50mV/DIV
AC COUPLED
I
L
100mA/DIV
RUN
2V/DIV
I
L
200mA/DIV
V
IN
= 3.6V
V
OUT
= 1.87V
I
LOAD
= 0A
400µs/DIV
3542 G02
V
OUT
1V/DIV
RUN
2V/DIV
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.87V
I
LOAD
= 500mA
400µs/DIV
3563 G03
V
OUT
1V/DIV
Start-Up from Shutdown
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3563EDC#TRMPBF

Mfr. #:
Buy LTC3563EDC#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 500mA, Monolithic Buck w/ Selectable Output
Lifecycle:
New from this manufacturer.
Delivery:
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