2
LTC3406-1.2
340612fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OUT
Regulated Output Voltage I
OUT
= 100mA ● 1.164 1.2 1.236 V
∆V
OVL
Output Overvoltage Lockout ∆V
OVL
= V
OVL
– V
OUT
2.5 6.25 10 %
∆V
OUT
Output Voltage Line Regulation V
IN
= 2.5V to 5.5V ● 0.04 0.4 %/V
I
PK
Peak Inductor Current V
IN
= 3V, V
OUT
= 1.08V, Duty Cycle < 35% 0.75 1 1.25 A
V
LOADREG
Output Voltage Load Regulation 0.5 %
V
IN
Input Voltage Range ● 2.5 5.5 V
I
S
Input DC Bias Current (Note 4)
Active Mode V
OUT
= 1.08V, I
LOAD
= 0A 300 400 µA
Sleep Mode V
OUT
= 1.236V, I
LOAD
= 0A 20 35 µA
Shutdown V
RUN
= 0V, V
IN
= 5.5V 0.1 1 µA
f
OSC
Oscillator Frequency V
OUT
= 1.2V ● 1.2 1.5 1.8 MHz
V
OUT
= 0V 210 kHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA 0.4 0.5 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –100mA 0.35 0.45 Ω
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V ±0.01 ±1 µA
V
RUN
RUN Threshold ● 0.3 1 1.5 V
I
RUN
RUN Leakage Current ● ±0.01 ±1 µA
Input Supply Voltage .................................. – 0.3V to 6V
RUN, V
OUT
Voltages................................... –0.3V to V
IN
SW Voltage (DC) ......................... – 0.3V to (V
IN
+ 0.3V)
P-Channel Switch Source Current (DC) ............. 800mA
N-Channel Switch Sink Current (DC) ................. 800mA
Peak SW Sink and Source Current (V
IN
= 3V)........ 1.3A
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Notes 3, 5) ...................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
IN
= 3.6V unless otherwise specified.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3406E-1.2 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: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3406-1.2: T
J
= T
A
+ (P
D
)(250°C/W)
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: 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.
LTC3406ES5-1.2
LTBMQ
T
JMAX
= 125°C, θ
JA
= 250°C/ W, θ
JC
= 90°C/ W
RUN 1
GND 2
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
SW 3
5 V
OUT
4 V
IN
ORDER PART NUMBER
S5 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
