LTC3429/LTC3429B
2
3429fa
V
IN
Voltage .............................................. –0.3V to 4.4V
SW Voltage ................................................. – 0.3V to 6V
SHDN, FB Voltage ....................................... – 0.3V to 6V
V
OUT
........................................................... – 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
ORDER PART
NUMBER
S6 PART MARKING
T
JMAX
= 125°C, θ
JC
= 102°C/W
LTH5
LTBMS
LTC3429ES6
LTC3429BES6
(Note 1)
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.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.2V, V
OUT
= 3.3V, unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Start-Up Voltage I
LOAD
= 1mA, V
OUT
= 0V 0.85 1 V
Minimum Operating Voltage SHDN = V
IN
(Note 3) 0.5 0.65 V
Output Voltage Adjust Range (Note 5) 2.5 5 V
Feedback Voltage ● 1.192 1.230 1.268 V
Feedback Input Current V
FB
= 1.25V 1 50 nA
Quiescent Current (Burst Mode Operation) V
FB
= 1.4V (Note 4) 20 30 µA
Quiescent Current (Shutdown) V
SHDN
= 0V, Not Including Switch Leakage, V
OUT
= 0V 0.01 1 µA
Quiescent Current (Active) Measured on V
OUT
, Nonswitching 380 550 µA
NMOS Switch Leakage V
SW
= 5V 0.1 5 µA
PMOS Switch Leakage V
SW
= 5V, V
OUT
= 0V 0.1 5 µA
NMOS Switch On Resistance 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 V
FB
= 1.15V ● 80 90 %
Switching Frequency ● 380 500 620 kHz
SHDN Input High 1V
SHDN Input Low 0.35 V
SHDN Input Current V
SHDN
= 5.5V 0.01 1 µA
Soft-Start Time SHDN to 90% of V
OUT
2.5 ms
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
Note 3: Minimum V
IN
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 I
Q
is measured at V
OUT
. Multiply this value
by V
OUT
/V
IN
to get the equivalent input (battery) current.
Note 5: For applications where V
OUT
> 4.3V, an external Schottky diode is
required. See the Applications Information.
SW 1
GND 2
FB 3
6 V
IN
5 V
OUT
4 SHDN
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
Consult LTC Marketing for parts specified with wider operating temperature ranges.
