LTC3405A-1.8_15 Datasheet, PDF (2/16 Pages) Linear Technology – 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT

LTC3405A-1.5/LTC3405A-1.8
ABSOLUTE AXI U RATI GS
(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
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN 1
GND 2
SW 3
6 MODE
5 V_OUT
4 V_IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T_JMAX = 125°C, θ_JA = 250°C/ W
ORDER PART
NUMBER
LTC3405AES6-1.5
LTC3405AES6-1.8
S6 PART MARKING
LTZQ
LTZP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
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.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
I_PK
Peak Inductor Current
V_OUT
Regulated Output Voltage
V_IN = 3V, V_OUT = 90%, Duty Cycle < 35%
LTC3405A-1.5, MODE = 3.6V
LTC3405A-1.8, MODE = 3.6V
375 500 625
● 1.455 1.500 1.545
● 1.746 1.800 1.854
∆V_OVL
∆V_OUT
V_LOADREG
V_IN
I_S
f_OSC
∆Output Overvoltage Lockout
Output Voltage Line Regulation
Output Voltage Load Regulation
Input Voltage Range
Input DC Bias Current
Pulse Skipping Mode
Burst Mode^® Operation
Shutdown
Oscillator Frequency
R_PFET
R_NFET
I_LSW
V_RUN
I_RUN
V_MODE
I_MODE
R_DS(ON) of P-Channel FET
R_DS(ON) of N-Channel FET
SW Leakage
RUN Threshold
RUN Leakage Current
MODE Threshold
MODE Leakage Current
∆V_OVL = V_OVL – V_OUT
V_IN = 2.5V to 5.5V
(Note 4)
V_OUT = 90%, MODE = 3.6V, I_LOAD = 0A
V_OUT = 103%, MODE = 0V, I_LOAD = 0A
V_RUN = 0V, V_IN = 4.2V
V_OUT = 100%
V_OUT = 0V
I_SW = 100mA
I_SW = –100mA
V_RUN = 0V, V_SW = 0V or 5V, V_IN = 5V
2.5
7.8
13
●
0.04
0.4
0.5
● 2.5
5.5
300 400
20
35
0.1
1
● 1.2
1.5
1.8
170
0.7
0.85
0.6
0.90
±0.01 ±1
● 0.3
1
1.5
●
±0.01 ±1
● 0.3
1.5
2
●
±0.01 ±1
UNITS
mA
V
V
%
%/V
%
V
µA
µA
µA
MHz
kHz
Ω
Ω
µA
V
µA
V
µA
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.
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