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Linear Technology Electronic Components Datasheet

LTC3563EDC Datasheet

Synchronous Step-Down DC/DC Converter

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LTC3563
500mA, Synchronous
Step-Down DC/DC Converter
with Selectable Output Voltage
FEATURES
DESCRIPTIO
High Efficiency: Up to 96%
Pin Selectable Output Voltage: 1.28V/1.87V
Low Ripple (<20mVP-P) Burst Mode® Operation:
IQ = 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
U
APPLICATIO S
Cellular Telephones
Wireless and DSL Modems
Digital Cameras
MP3 Players
PDAs and Other Handheld Devices
The LTC®3563 is a high efficiency 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 efficiency
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 specifically designed to work
well with ceramic output capacitors, achieving very low
output voltage ripple and a small PCB footprint.
The LTC3563 is configured for the power saving Burst
Mode Operation.
, 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.
TYPICAL APPLICATIO
VIN
2.7V TO 5.5V
CIN
10µF
CER
1.28V 1.87V
VIN
SW
LTC3563
RUN VOUT
VSEL
GND
2.2µH
VOUT
1.28V/1.87V
500mA
COUT
10µF
CER
3563 TA01a
Efficiency and Power Loss vs Output Current
100
90
80
70
60
50
40
30
20
10
0
0.1
1000
100
10
1
VIN = 3.6V
VOUT = 1.87V
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
3563 TA01b
3563f
1


Linear Technology Electronic Components Datasheet

LTC3563EDC Datasheet

Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3563
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VIN) ........................... –0.3V to 6V
VOUT, RUN Voltages .....................................–0.3V to VIN
VSEL Voltage...................................–0.3V to (VIN + 0.3V)
SW Voltage ....................................–0.3V to (VIN + 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
Reflow Peak Body Temperature (DFN) .................. 260°C
PACKAGE/ORDER INFORMATION
TOP VIEW
VOUT 1
6 RUN
VIN 2
7
5 VSEL
GND 3
4 SW
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 102°C/W, θJC = 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 specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
VOUT
ΔVLINE_REG
ΔVLOAD_REG
IS
Operating Voltage Range
Output Voltage (Note 4)
VSEL = 0V
VSEL = High
Reference Voltage Line Regulation (Note 4) VIN = 2.5V to 5.5V
Output Voltage Load Regulation (Note 4) ILOAD = 100mA to 500mA
Input DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown
VOUT = 1.1V, VSEL = 0V
VOUT = 1.4V, VSEL = 0V
RUN = 0V
2.5
5.5
V
1.254 1.28 1.306
V
1.832 1.87 1.908
V
0.04
0.2
%/V
0.2
%
500
µA
26
35
µA
0.1
1
µA
fOSC
ILIM
RDS(ON)
ISW(LKG)
Oscillator Frequency
Peak Switch Current
P-Channel On Resistance (Note 6)
N-Channel On Resistance (Note 6)
Switch Leakage Current
1.8
2.25
2.7
MHz
VIN = 3V, VFB = 0.5V, Duty Cycle < 35%
ISW = 100mA
ISW = 100mA
VIN = 5V, VRUN = 0V, VSW = 0V or 5V
650 1000 1750
mA
0.5
0.65
Ω
0.35 0.55
Ω
±0.01 ±1
µA
3563f
2


Part Number LTC3563EDC
Description Synchronous Step-Down DC/DC Converter
Maker Linear
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