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Linear Technology Electronic Components Datasheet

LTC3409AIDD Datasheet

600mA Low VIN Buck Regulator

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LTC3409A
600mA Low VIN Buck
Regulator in 3mm × 3mm DFN
FEATURES
n 1.6V to 5.5V Input Voltage Range
n 0.62V to 5.5V Output Voltage Range
n Internal Soft-Start
n Selectable 1.7MHz or 2.6MHz Constant Frequency
Operation
n Internal Oscillator Can Be Synchronized to an
External Clock, 1MHz to 3MHz Range
n High Efficiency: Up to 95%
n 65μA Quiescent Current, Burst Mode® Operation
n 600mA Output Current (VIN = 1.8V, VOUT = 1.2V)
n 750mA Peak Inductor Current
n No Schottky Diode Required
n Low Dropout Operation: 100% Duty Cycle
n 0.612V Reference Voltage
n Stable with Ceramic Capacitors
n Shutdown Mode Draws <1μA Supply Current
n Current Mode Operation for Excellent Line and Load
Transient Response
n Overtemperature Protection
n Available in a Low Profile (0.75mm)
8-Lead (3mm × 3mm) DFN Package
APPLICATIONS
n Cellular Phones
n Digital Cameras
n MP3 Players
DESCRIPTION
The LTC®3409A is a high efficiency, monolithic synchronous
buck regulator using a constant frequency, current mode
architecture. The LTC3409A improves upon the LTC3409’s
light load regulation in Burst Mode operation. The output
voltage is adjusted via an external resistor divider.
Fixed switching frequencies of 1.7MHz and 2.6MHz are
supported. Alternatively, an internal PLL will synchronize
to an external clock in the frequency range of 1MHz to
3MHz. This range of switching frequencies allows the
use of small surface mount inductors and capacitors,
including ceramics.
Supply current during Burst Mode operation is only
65μA dropping to <1μA in shutdown. The 1.6V to 5.5V
input voltage range makes the LTC3409A ideally suited
for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd
or NiMH battery-powered applications. 100% duty cycle
capability provides low dropout operation, extending bat-
tery life in portable systems. Burst Mode operation can be
user-enabled, increasing efficiency at light loads, further
extending battery life.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Internal
soft-start offers controlled output voltage rise time at start-
up without the need for external components.
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.
TYPICAL APPLICATION
High Efficiency Step-Down Converter
VIN
1.8V TO 5.5V
4.7μF
LTC3409A
VIN
SW
RUN
MODE VFB
SYNC GND
2.2μH*
10pF
267k
137k
*SUMIDA CDRH2D18/LD
VOUT
1.8V
22μF
s2
3409A TA01
Burst Mode Efficiency, 1.8VOUT
100
1
90 2.5VIN, BURST
80
0.1
70
60
3.6VIN, BURST
50
0.01
40
4.2VIN, BURST
POWER LOST
30
3.6VIN, BURST
0.001
20
10
0
0.0001
0
1
10
100
1000
LOAD CURRENT (mA)
3409A TA01b
3409af
1


Linear Technology Electronic Components Datasheet

LTC3409AIDD Datasheet

600mA Low VIN Buck Regulator

No Preview Available !

LTC3409A
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage................................... –0.3V to 6V
RUN, VFB, MODE, SYNC Voltages . –0.3V to (VIN + 0.3V)
SW Voltage ................................... –0.3V to (VIN + 0.3V)
Operating Temperature Range (Note 2) ..–40°C to 85°C
Junction Temperature (Note 3) ........................... 125°C
Storage Temperature Range.................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
VFB 1
8 SYNC
GND 2
7 RUN
9
VIN 3
6 SW
VIN 4
5 MODE
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3409AEDD#PBF
LTC3409AEDD#TRPBF LFGY
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3409AIDD#PBF
LTC3409AIDD#TRPBF LFGY
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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 denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 2.2V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
VIN
Input Voltage Range
l 1.6
5.5
VFB
Regulated Feedback Voltage
(Note 4) TA = 25°C
(Note 4) 0°C ≤ TA ≤ 85°C
(Note 4) –40°C ≤ TA ≤ 85°C
IVFB
Feedback Current
VFB = 0.612V
0.604
0.600
l 0.598
0.612
0.612
0.612
0.620
0.624
0.626
±30
ΔVOVL
ΔVFBOVL Overvoltage Lockout
ΔVOVL = ΔVFBOVL – VFB (Note 6)
35
61
85
ΔVFB
Reference Voltage Line Regulation 1.6V < VIN < 5.5V (Note 4)
l
1.9V ≤ VIN ≤ 3.6V, 0°C ≤ TA ≤ 85°C (Note 4)
0.04
0.4
0.05
0.5
IPK
Peak Inductor Current
VFB = 0.5V or VOUT = 90%
0.75
1
1.3
VLOADREG
Output Voltage Load Regulation
VOUT = 1.8V, VMODE = 0V, 1mA < ILOAD < 210mA,
0°C ≤ TA ≤ 85°C (Note 8)
0.2
0.5
VRUN
RUN Threshold
l 0.3
0.65
1.1
IRUN
VMODE
IMODE
RUN Leakage Current
MODE Threshold
MODE Leakage Current
VRUN = 0V or = 2.2V
VMODE = 0V or = 2.2V
0.01
1
l 0.3
0.65
1.1
0.01
1
UNITS
V
V
V
V
nA
mV
%/V
%
A
%
V
μA
V
μA
3409af
2


Part Number LTC3409AIDD
Description 600mA Low VIN Buck Regulator
Maker Linear
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