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Linear Technology Electronic Components Datasheet

LTC3406B-2ES5 Datasheet

600mA Synchronous Step-Down Regulator

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FEATURES
High Efficiency: Up to 96%
600mA Output Current at VIN = 3V
2.5V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 350µA
0.6V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Low Profile (1mm) SOT-23 Package
U
APPLICATIO S
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
LTC3406B-2
2.25MHz, 600mA
Synchronous Step-Down
Regulator in ThinSOTTM
DESCRIPTIO
The LTC®3406B-2 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Supply current with no load is 350µA,
dropping to <1µA in shutdown. The 2.5V to 5.5V input
voltage range makes the LTC3406B-2 ideally suited for
single Li-Ion battery-powered applications. 100% duty
cycle capability provides low dropout operation, extend-
ing battery life in portable systems. PWM pulse skipping
mode operation provides very low output ripple voltage for
noise sensitive applications.
The switching frequency is internally set at 2.25MHz, allow-
ing the use of tiny 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 LTC3406B-2 is available in a low pro-
file (1mm) SOT-23 package. Refer to LTC3406 for appli-
cations that require Burst Mode® operation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Protected by U.S. Patents, including 6580258, 5481178.
TYPICAL APPLICATIO
VIN
2.7V
TO 5.5V
High Efficiency Step-Down Converter
4.7µF
CER
VIN
SW
LTC3406B-2
RUN
VFB
GND
2.2µH*
22pF
1M
10µF
CER
VOUT
1.8V
600mA
499k
3406B TA01a
Efficiency vs Load Current
100
VOUT = 1.8V
90 TA = 25°C
80
70
60
VIN = 3.6V
50
VIN = 2.7V
40
30
20
10
0.1
VIN = 4.2V
1
10
100
OUTPUT CURRENT (mA)
1000
3406B TA01b
sn3406b2 3406b2fs
1


Linear Technology Electronic Components Datasheet

LTC3406B-2ES5 Datasheet

600mA Synchronous Step-Down Regulator

No Preview Available !

LTC3406B-2
ABSOLUTE AXI U RATI GS
(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) ............. 800mA
N-Channel Switch Sink Current (DC) ................. 800mA
Peak SW Sink and Source Current ........................ 1.3A
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Maximum Junction Temperature (Notes 3, 6) ..... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
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 PART
NUMBER
LTC3406B-2ES5
S5 PART MARKING
LTAGH
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 3.6V unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IVFB
Feedback Current
±30
VFB
Regulated Feedback Voltage
(Note 4) TA = 25°C
(Note 4) 0°C TA 85°C
(Note 4) –40°C TA 85°C
0.5880 0.6 0.6120
0.5865 0.6 0.6135
0.5850 0.6 0.6150
VFB
VOVL
Reference Voltage Line Regulation
Output Overvoltage Lockout
VIN = 2.5V to 5.5V (Note 4)
VOVL = VOVL – VFB, LTC3406B
0.04
0.4
20
50
80
IPK
Peak Inductor Current
VIN = 3V, VFB = 0.5V or VOUT = 90%,
Duty Cycle < 35%
0.75
1
1.25
VLOADREG Output Voltage Load Regulation
0.5
VIN
Input Voltage Range
2.5
5.5
IS
Input DC Bias Current
Shutdown
fOSC
Oscillator Frequency
(Note 5)
VFB = 0.5V or VOUT = 90%
VRUN = 0V, VIN = 4.2V
VFB = 0.6V or VOUT = 100%
VFB = 0V or VOUT = 0V
350 500
0.1
1
1.8
2.25
2.7
310
RPFET
RNFET
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
ISW = 100mA
ISW = –100mA
0.4
0.5
0.35 0.45
ILSW
SW Leakage
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
±0.01 ±1
VRUN
IRUN
RUN Threshold
RUN Leakage Current
0.3
1
1.5
±0.01 ±1
UNITS
nA
V
V
V
%/V
mV
A
%
V
µA
µA
MHz
kHz
µA
V
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3406B-2ES5 is guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC3406B-2ES5: TJ = TA + (PD)(250°C/W)
Note 4: The LTC3406B-2ES5 is tested in a proprietary test mode that
connects VFB to the output of the error amplifier.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: 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 specified maximum operating junction
temperature may impair device reliability.
2
sn3406b2 3406b2fs


Part Number LTC3406B-2ES5
Description 600mA Synchronous Step-Down Regulator
Maker Linear
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