Step-Down Regulator. LTC3406A Datasheet

LTC3406A Regulator. Datasheet pdf. Equivalent

Part LTC3406A
Description 600mA Synchronous Step-Down Regulator
Feature FEATURES ■ High Efficiency: Up to 96% ■ Very Low Quiescent Current: Only 20µA ■ Low Output Ripple Vol.
Manufacture Linear Technology
Datasheet
Download LTC3406A Datasheet




LTC3406A
FEATURES
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20µA
Low Output Ripple Voltage During Burst Mode®
Operation
600mA Output Current
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
±2% 0.6V Reference
Shutdown Mode Draw 1µA Supply Current
Internal Soft-Start Limits Inrush Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) ThinSOTTM Package
APPLICATIONS
Cellular Telephones
Wireless and DSL Modems
Digital Still Cameras
Media Players
Portable Instruments
Point of Load Regulation
TYPICAL APPLICATION
2.2μH
VIN VIN SW
4.7μF
22pF
CER LTC3406A
RUN VFB
GND
619k
309k
3406A TA01
VOUT
1.8V
600mA
10μF
CER
LTC3406A
1.5MHz, 600mA
Synchronous Step-Down
Regulator in ThinSOT
DESCRIPTION
The LTC®3406A is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Supply current during operation is only
20μA, dropping to ≤1μA in shutdown. The 2.5V to 5.5V
input voltage range makes the LTC3406A ideally suited
for single Li-Ion battery-powered applications. 100% duty
cycle provides low dropout operation, extending battery
runtime portable systems. Automatic Burst Mode opera-
tion increases efficiency at light loads, further extending
battery runtime.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency
and eliminates the need for an external Schottky diode.
Low output voltages are easily supported with the 0.6V
feedback reference voltage. The LTC3406A is available in
a low profile (1mm) ThinSOT package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 6580258.
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20 VIN = 2.7V
10 VIN = 3.6V
0 VOUT = 1.8V
VIN = 4.2V
0.1 1 10 100 1000
OUTPUT CURRENT (mA)
3406A TA01b
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LTC3406A
LTC3406A
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage....................................– 0.3V to 6V
RUN, VFB Voltages .......................................–0.3V to VIN
SW Voltage (DC)........................... – 0.3V to (VIN + 0.3V)
P-Channel Switch Source Current (DC)
(Note 7)................................................................800mA
N-Channel Switch Sink Current (DC) (Note 7) .....800mA
Peak SW Sink and Source Current (Note 7) .............1.3A
Operating Temperature Range (Note 2)
LTC3406AE ..............................................– 40°C to 85°C
LTC3406AI .............................................– 40°C to 125°C
Junction Temperature (Notes 3, 6)........................ 125°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
RUN 1
GND 2
SW 3
5 VFB
4 VIN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 250°C/W, θJC = 90°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3406AES5#PBF
LTC3406AES5#TRPBF LTCWJ
5-Lead Plastic TSOT-23
–40°C to 85°C
LTC3406AIS5#PBF
LTC3406AIS5#TRPBF LTCWJ
5-Lead Plastic TSOT-23
–40°C to 125°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 the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IVFB Feedback Current
VFB
Regulated Feedback Voltage
(Note 4) LTC3406AE
(Note 4) LTC3406AI
±30
0.5880 0.6 0.6120
0.585 0.6 0.615
nA
V
V
VFB
Reference Voltage Line Regulation
VIN = 2.5V to 5.5V (Note 4) LTC3406AE
0.04 0.4
%/V
VIN = 2.5V to 5.5V (Note 4) LTC3406AI
0.04 0.6
%/V
IPK Peak Inductor Current
VIN = 3V, VFB = 0.5V
Duty Cycle < 35%
0.75 1 1.25
A
VLOADREG
VIN
IS
fOSC
Output Voltage Load Regulation
Input Voltage Range
Input DC Bias Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
(Note 5)
VFB = 0V
VFB = 0.63V
VRUN = 0V, VIN = 5.5V
VFB = 0.6V
0.5
2.5
5.5
200 300
16 30
0.1 1
1.2 1.5 1.8
%
V
μA
μA
μA
MHz
RPFET
RDS(ON) of P-Channel FET
ISW = 100mA
0.23 0.35
Ω
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