Datasheet

2
LTC3405A-1.5/LTC3405A-1.8
3405a1518fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PK
Peak Inductor Current V
IN
= 3V, V
OUT
= 90%, Duty Cycle < 35% 375 500 625 mA
V
OUT
Regulated Output Voltage LTC3405A-1.5, MODE = 3.6V ● 1.455 1.500 1.545 V
LTC3405A-1.8, MODE = 3.6V
● 1.746 1.800 1.854 V
∆V
OVL
∆Output Overvoltage Lockout ∆V
OVL
= V
OVL
– V
OUT
2.5 7.8 13 %
∆V
OUT
Output Voltage Line Regulation V
IN
= 2.5V to 5.5V ● 0.04 0.4 %/V
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)
Pulse Skipping Mode V
OUT
= 90%, MODE = 3.6V, I
LOAD
= 0A 300 400 µA
Burst Mode
®
Operation V
OUT
= 103%, MODE = 0V, I
LOAD
= 0A 20 35 µA
Shutdown V
RUN
= 0V, V
IN
= 4.2V 0.1 1 µA
f
OSC
Oscillator Frequency V
OUT
= 100% ● 1.2 1.5 1.8 MHz
V
OUT
= 0V 170 kHz
R
PFET
R
DS(ON)
of P-Channel FET I
SW
= 100mA 0.7 0.85 Ω
R
NFET
R
DS(ON)
of N-Channel FET I
SW
= –100mA 0.6 0.90 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
V
MODE
MODE Threshold ● 0.3 1.5 2 V
I
MODE
MODE Leakage Current ● ±0.01 ±1 µA
LTC3405AES6-1.5
LTC3405AES6-1.8
T
JMAX
= 125°C, θ
JA
= 250°C/ W
ORDER PART
NUMBER
(Note 1)
Input Supply Voltage .................................. –0.3V to 6V
MODE, RUN, V
OUT
Voltages....................... –0.3V to V
IN
SW Voltage .................................. –0.3V to (V
IN
+ 0.3V)
P-Channel Switch Source Current (DC) ............. 400mA
N-Channel Switch Sink Current (DC) ................. 400mA
Peak SW Sink and Source Current .................... 630mA
Operating Temperature Range (Note 2) .. –40°C to 85°C
Junction Temperature (Note 3)............................ 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
S6 PART MARKING
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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.
LTZQ
LTZP
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
RUN 1
GND 2
SW 3
6 MODE
5 V
OUT
4 V
IN
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
Burst Mode is a registered trademark of Linear Technology Corporation.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3405AE 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:
LTC3405A: 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.