Datasheet

3
LTC3404
3404fb
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3404E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3404I is guaranteed to meet
performance specifications over the –40°C to 85°C operating temperature
range. The LTC3404MP is guaranteed to meet performance specifications
over the –55°C to 125°C operating temperature range.
Note 3: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
T
J
= T
A
+ (P
D
)(150°C/W)
Note 4: The LTC3404 is tested in a feedback loop which servos V
FB
to the
balance point for the error amplifier (V
ITH
= 1.2V).
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
VFB
Feedback Current (Note 4) 4 30 nA
V
FB
Regulated Output Voltage (Note 4) 0°C ≤ T
A
≤ 125°C 0.784 0.8 0.816 V
(Note 4) – 55°C ≤ T
A
≤ 125°C 0.74 0.8 0.84 V
ΔV
OVL
Output Overvoltage Lockout ΔV
OVL
= V
OVL
– V
FB
20 50 110 mV
ΔV
FB
Reference Voltage Line Regulation V
IN
= 2.65V to 6V (Note 4) 0.05 0.2 %/V
V
LOADREG
Output Voltage Load Regulation Measured in Servo Loop; V
ITH
= 0.9V to 1.2V 0.1 1 %
Measured in Servo Loop; V
ITH
= 1.5V to 1.2V –0.1 –1 %
V
IN
Input Voltage Range 2.65 6 V
I
Q
Input DC Bias Current (Note 5)
Pulse Skipping Mode 2.65V < V
IN
< 6V, V
SYNC/MODE
= 0V, I
OUT
= 0A 400 700 μA
Burst Mode Operation V
SYNC/MODE
= V
IN
, I
OUT
= 0A 10 15 μA
Shutdown V
RUN
= 0V, V
IN
= 6V 0 1 μA
f
OSC
Oscillator Frequency V
FB
= 0.8V 1.25 1.4 1.65 MHz
V
FB
= 0V 200 kHz
f
SYNC
SYNC Capture Range 1.0 1.7 MHz
I
PLL LPF
Phase Detector Output Current
Sinking Capability f
PLLIN
< f
OSC
6 20 40 μA
Sourcing Capability f
PLLIN
> f
OSC
–6 –20 –40 μA
R
PFET
R
DS(ON)
of P-Channel MOSFET I
SW
= 100mA 0.7 Ω
R
NFET
R
DS(ON)
of N-Channel MOSFET I
SW
= –100mA 0.8 Ω
I
PK
Peak Inductor Current V
IN
= 3.3V, V
FB
= 0.7V, Duty Cycle < 35%, 0.4 1.0 1.1 A
T
A
= 125°C
V
IN
= 4V, V
FB
= 0.7V, Duty Cycle < 35%, 0.8 1.2 A
T
A
= 125°C
I
LSW
SW Leakage V
RUN
= 0V, V
SW
= 0V or 6V, V
IN
= 6V ±3 μA
V
SYNC/MODE
SYNC/MODE Threshold V
SYNC/MODE
Rising 0.3 1.5 V
I
SYNC/MODE
SYNC/MODE Leakage Current ±1 μA
V
RUN
RUN Threshold V
RUN
Rising 0.3 1.5 V
I
RUN
RUN Input Current ±1 μA
The ● denotes specifications which apply over –55°C to 125°C, otherwise specifications are T
A
= 25°C.
V
IN
= 3.6V unless otherwise specified.
ELECTRICAL CHARACTERISTICS