LTZW Просмотр технического описания (PDF) - Linear Technology
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LTZW Datasheet PDF : 16 Pages
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LTC3405A
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
LTC3405AES6
S6 PART MARKING
LTZW
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
nA
375 500 625
mA
● 0.784 0.8 0.816
V
●
20
50
80
mV
●
0.04
0.4
%/V
0.5
%
● 2.5
5.5
V
300 400
µA
20
35
µA
0.1
1
µA
● 1.2
1.5
1.8
MHz
210
kHz
0.7
0.85
Ω
0.6
0.90
Ω
±0.01 ±1
µA
● 0.3
1
1.5
V
●
±0.01 ±1
µA
● 0.3
1.5
2
V
●
±0.01 ±1
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3405AE 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:
LTC3405A: TJ = TA + (PD)(250°C/W)
Note 4: The LTC3405A 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.
3405afa
2
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