2
LTC34 08
3408f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OUT
Regulated Output Voltage V
REF
= 1.1V ● 3.23 3.3 3.37 V
V
REF
= 0.1V ● 0.25 0.3 0.35 V
∆V
OUT
Output Voltage Line Regulation V
IN
= 2.5V to 5V, V
REF
= 0.6V ● 0.1 0.4 %/V
I
PK
Peak Inductor Current V
IN
= 3V, V
REF
= 0.9V 0.70 1 1.25 A
V
LOADREG
Output Voltage Load Regulation 0.7 %
V
IN
Input Voltage Range ● 2.5 5 V
I
S
Input Current V
RUN
= 1.2V, SW = Open 1.5 2.5 mA
Shutdown Current V
RUN
= 0V, SW = Open 0.1 1 µA
f
OSC
Oscillator Frequency V
REF
≥ 0.25V ● 1.2 1.5 1.8 MHz
V
REF
≤ 0.1V 550 700 850 kHz
V
REF
Bypass PFET Turn-Off Threshold V
REF
= 1.167 1.2 V
Bypass PFET Turn-On Threshold V
REF
= 1.21 1.26 V
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 160mA, Wafer Level 0.3 0.4 Ω
I
SW
= 160mA, DD Package 0.4 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –160mA, Wafer Level 0.3 0.4 Ω
I
SW
= –160mA, DD Package 0.4 Ω
R
BYPASS
R
DS(ON)
of Bypass P-Channel FET I
OUT
= 100mA, V
IN
= 3V, Wafer Level 0.05 0.08 Ω
I
OUT
= 100mA, V
IN
= 3V, DD Package (Note 4) 0.08 Ω
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V ±0.01 ±1 µA
I
LBYP
Bypass PFET Leakage V
OUT
= 0V, V
IN
= 5V, V
REF
= 0V ±0.01 ±1 µA
V
RUN
RUN Threshold ● 0.3 1 1.5 V
I
RUN
RUN Input Current V
RUN
= 0V or 2.5V ● ±0.01 ±1 µA
I
REF
REF Input Current ● ±0.01 ±1 µA
Input Supply Voltage (<300µs) .................. – 0.3V to 6V
Input Supply Voltage (DC) ....................... –0.3V to 5.5V
RUN, REF, 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 ........................ 1.3A
Bypass P-Channel FET Source Current (DC).............. 1A
Operating Temperature Range (Note 2) .. –40°C to 85°C
Junction Temperature (Note 3)............................ 125°C
Storage Temperature Range ................ –65°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
LTC3408EDD
ORDER PART
NUMBER
DD PART MARKING
LAEA
T
JMAX
= 125°C, θ
JA
= 43°C/ W, θ
JC
= 3°C/ W
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
8
7
6
5
1
2
3
4
V
OUT
V
IN
REF
RUN
V
OUT
V
IN
GND
SW
TOP VIEW
DD PACKAGE
8-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD IS GND (PIN 9)
MUST BE SOLDERED TO PCB
9
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3408E 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:
LTC3408: T
J
= T
A
+ (P
D
)(43°C/W)
