LTC3405A-1.8 Linear Technology, LTC3405A-1.8 Datasheet - Page 2

• Manufacturer Part Number: LTC3405A-1.8
• Description: 1.5V / 1.8V / 1.5MHz - 300mA Synchronous Step-Down Regulators in ThinSOT
• Manufacturer: Linear Technology

ABSOLUTE AXI U RATI GS
LTC3405A-1.5/LTC3405A-1.8
(Note 1)
Input Supply Voltage .................................. – 0.3V to 6V
MODE, RUN, V
SW Voltage .................................. – 0.3V to (V
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
The
V
SYMBOL
I
V
V
V
I
f
R
R
I
V
I
V
I
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.
ELECTRICAL CHARACTERISTICS
2
PK
S
OSC
LSW
RUN
MODE
OUT
LOADREG
IN
RUN
MODE
IN
V
V
PFET
NFET
OVL
OUT
= 3.6V unless otherwise specified.
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
PARAMETER
Peak Inductor Current
Regulated Output Voltage
Output Voltage Line Regulation
Output Voltage Load Regulation
Input Voltage Range
Input DC Bias Current
Oscillator Frequency
R
R
SW Leakage
RUN Threshold
RUN Leakage Current
MODE Threshold
MODE Leakage Current
Output Overvoltage Lockout
DS(ON)
DS(ON)
Pulse Skipping Mode
Burst Mode
Shutdown
OUT
of P-Channel FET
of N-Channel FET
W
Voltages....................... – 0.3V to V
®
Operation
W W
CONDITIONS
V
LTC3405A-1.5, MODE = 3.6V
LTC3405A-1.8, MODE = 3.6V
V
(Note 4)
V
V
V
V
V
I
I
V
SW
SW
IN
V
IN
OUT
OUT
RUN
OUT
OUT
RUN
OVL
= 3V, V
= 2.5V to 5.5V
= 100mA
= –100mA
U
= 90%, MODE = 3.6V, I
= 103%, MODE = 0V, I
= 100%
= 0V
= 0V, V
= 0V, V
= V
IN
OVL
OUT
+ 0.3V)
IN
SW
– V
= 90%, Duty Cycle < 35%
= 4.2V
= 0V or 5V, V
OUT
IN
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Note 3: T
dissipation P
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
LOAD
LOAD
IN
LTC3405A: T
= 5V
= 0A
= 0A
RUN 1
GND 2
SW 3
J
T
JMAX
is calculated from the ambient temperature T
6-LEAD PLASTIC SOT-23
D
= 125 C,
according to the following formula:
S6 PACKAGE
J
TOP VIEW
= T
A
JA
+ (P
= 250 C/ W
D
)(250 C/W)
6 MODE
5 V
4 V
OUT
IN
1.455
1.746
MIN
375
2.5
2.5
1.2
0.3
0.3
U
www.DataSheet4U.com
1.500
1.800
S6 PART MARKING
0.04
TYP
500
300
170
7.8
0.1
1.5
0.7
0.6
1.5
LTC3405AES6-1.5
LTC3405AES6-1.8
0.01
0.01
0.01
20
0.5
1
ORDER PART
A
NUMBER
sn3405a1518 3405a1518fs
W
= 25 C.
LTZQ
LTZP
A
1.545
1.854
MAX
0.85
0.90
625
400
0.4
5.5
1.8
1.5
13
35
and power
1
2
1
1
1
UNITS
U
MHz
%/V
kHz
mA
%
%
V
V
V
A
A
A
A
V
A
V
A