LTC3429 Просмотр технического описания (PDF) - Linear Technology
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LTC3429 Datasheet PDF : 12 Pages
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LTC3429/LTC3429B
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage .............................................. – 0.3V to 4.4V
SW Voltage ................................................. – 0.3V to 6V
SHDN, FB Voltage ....................................... – 0.3V to 6V
VOUT ........................................................... – 0.3V to 6V
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................... – 65°C to 150°
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SW 1
GND 2
FB 3
6 VIN
5 VOUT
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJC = 102°C/W
ORDER PART
NUMBER
LTC3429ES6
LTC3429BES6
S6 PART MARKING
LTH5
LTBMS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Start-Up Voltage
Minimum Operating Voltage
Output Voltage Adjust Range
ILOAD = 1mA, VOUT = 0V
SHDN = VIN (Note 3)
(Note 5)
0.85
1
V
0.5 0.65
V
2.5
5
V
Feedback Voltage
● 1.192 1.230 1.268
V
Feedback Input Current
Quiescent Current (Burst Mode Operation)
Quiescent Current (Shutdown)
Quiescent Current (Active)
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch On Resistance
VFB = 1.25V
VFB = 1.4V (Note 4)
VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V
Measured on VOUT, Nonswitching
VSW = 5V
VSW = 5V, VOUT = 0V
1
50
nA
20
30
µA
0.01
1
µA
380
550
µA
0.1
5
µA
0.1
5
µA
0.35
Ω
PMOS Switch On Resistance
0.45
Ω
NMOS Current Limit
600
850
mA
Burst Mode Operation Current Threshold
L = 4.7µH (LTC3429 Only)
1.25
mA
Current Limit Delay to Output
40
ns
Max Duty Cycle
Switching Frequency
VFB = 1.15V
● 80
90
%
● 380
500
620
kHz
SHDN Input High
1
V
SHDN Input Low
0.35
V
SHDN Input Current
Soft-Start Time
VSHDN = 5.5V
SHDN to 90% of VOUT
0.01
1
µA
2.5
ms
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3429ES6/LTC3429BES6 are 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: Minimum VIN operation after start-up is only limited by the
battery’s ability to provide the necessary power as it enters a deeply
discharged state.
Note 4: Burst Mode operation IQ is measured at VOUT. Multiply this value
by VOUT/VIN to get the equivalent input (battery) current.
Note 5: For applications where VOUT > 4.3V, an external Schottky diode is
required. See the Applications Information.
3429fa
2
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