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Linear Technology Electronic Components Datasheet

LTC3405 Datasheet

Synchronous Step-Down Regulator

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FEATURES
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20µA
During Operation
300mA Output Current at VIN = 3V
2.5V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws < 1µA Supply Current
±2% Output Voltage Accuracy
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
ULow Profile (1mm) ThinSOTTM Package
APPLICATIO S
Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
LTC3405
1.5MHz, 300mA
Synchronous Step-Down
Regulator in ThinSOT
DESCRIPTIO
The LTC®3405 is a high efficiency monolithic synchro-
nous buck regulator using a constant frequency, current
mode architecture. Supply current during operation is
only 20µA and drops to <1µA in shutdown. The 2.5V to
5.5V input voltage range makes the LTC3405 ideally suited
for single Li-Ion battery-powered applications. 100% duty
cycle provides low dropout operation, extending battery
life in portable systems.
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 0.8V feed-
back reference voltage. The LTC3405 is available in a low
profile (1mm) ThinSOT package.
For new designs, refer to the LTC3405A data sheet. For
fixed 1.5V and 1.8V output versions, refer to the
LTC3405A-1.5/LTC3405A-1.8 data sheet.
, LTC and LT are registered trademarks 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
CIN
2.2µF
CER
4
VIN
3
SW
LTC3405
1
RUN
65
MODE VFB
GND
2
4.7µH**
22pF
887k
280k
+
3405 F01a
*VOUT CONNECTED TO VIN FOR 2.7V < VIN < 3.3V
**MURATA LQH3C4R7M34
TAIYO YUDEN LMK212BJ225MG
††AVX TPSB336K006R0600
VOUT*
3.3V
COUT††
33µF
Figure 1a. High Efficiency Step-Down Converter
100
95 VIN = 3.6V
90
85
VIN = 4.2V
80
75
VIN = 5.5V
70
65
60
0.1
1 10 100
OUTPUT CURRENT (mA)
1000
3405 F01b
Figure 1b. Efficiency vs Load Current
3405fa
1


Linear Technology Electronic Components Datasheet

LTC3405 Datasheet

Synchronous Step-Down Regulator

No Preview Available !

LTC3405
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage .................................. – 0.3V to 6V
MODE, RUN, VFB Voltages ......................... – 0.3V to VIN
SW Voltage .................................. – 0.3V to (VIN + 0.3V)
P-Channel Switch Source Current (DC) ............. 400mA
N-Channel Switch Sink Current (DC) ................. 400mA
Peak SW Sink and Source Current .................... 630mA
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................ 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
6 MODE
5 VFB
4 VIN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 250°C/ W
ORDER PART
NUMBER
LTC3405ES6
S6 PART MARKING
LTXQ
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
UNITS
IVFB Feedback Current
IPK Peak Inductor Current
VIN = 3V, VFB = 0.7V, Duty Cycle < 35%
VFB Regulated Feedback Voltage
(Note 4)
VOVL
Output Overvoltage Lockout
VOVL = VOVL – VFB
VFB Reference Voltage Line Regulation VIN = 2.5V to 5.5V (Note 4)
VLOADREG Output Voltage Load Regulation
VIN Input Voltage Range
IS Input DC Bias Current
Pulse Skipping Mode
Burst Mode® Operation
Shutdown
(Note 5)
VFB = 0.7V, Mode = 3.6V, ILOAD = 0A
VFB = 0.83V, Mode = 0V, ILOAD = 0A
VRUN = 0V, VIN = 4.2V
fOSC Oscillator Frequency
VFB = 0.8V
VFB = 0V
RPFET
RDS(ON) of P-Channel FET
ISW = 100mA
RNFET
RDS(ON) of N-Channel FET
ISW = –100mA
ILSW SW Leakage
VRUN = 0V, VSW = 0V or 5V, VIN = 5V
VRUN
RUN Threshold
IRUN RUN Leakage Current
VMODE
MODE Threshold
IMODE
MODE Leakage Current
Burst Mode is a registered trademark of Linear Technology Corporation.
±30
375 500 625
0.784 0.8 0.816
20 50 80
0.04 0.4
0.5
2.5
5.5
300 400
20 35
0.1 1
1.2 1.5 1.8
210
0.7 0.85
0.6 0.90
±0.01 ±1
0.3 1 1.5
±0.01 ±1
0.3
1.5
2
±0.01 ±1
nA
mA
V
mV
%/V
%
V
µA
µA
µA
MHz
kHz
µA
V
µA
V
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3405E 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:
LTC3405: TJ = TA + (PD)(250°C/W)
Note 4: The LTC3405 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.
3405fa
2


Part Number LTC3405
Description Synchronous Step-Down Regulator
Maker Linear Technology
Total Page 16 Pages
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