LTC3405A_15 Datasheet, PDF (2/16 Pages) Linear Technology – 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT

LTC3405A
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage .................................. – 0.3V to 6V
MODE, RUN, V_FB 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_FB
4 V_IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T_JMAX = 125°C, θ_JA = 250°C/ W
ORDER PART
NUMBER
LTC3405AES6
S6 PART MARKING
LTZW
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
UNITS
I_VFB
Feedback Current
I_PK
Peak Inductor Current
V_IN = 3V, V_FB = 0.7V, Duty Cycle < 35%
V_FB
Regulated Feedback Voltage
(Note 4)
∆V_OVL
∆Output Overvoltage Lockout
∆V_OVL = V_OVL – V_FB
∆V_FB
Reference Voltage Line Regulation V_IN = 2.5V to 5.5V (Note 4)
V_LOADREG Output Voltage Load Regulation
V_IN
Input Voltage Range
I_S
Input DC Bias Current
Pulse Skipping Mode
Burst Mode^® Operation
Shutdown
(Note 5)
V_FB = 0.7V, Mode = 3.6V, I_LOAD = 0A
V_FB = 0.83V, Mode = 0V, I_LOAD = 0A
V_RUN = 0V, V_IN = 4.2V
f_OSC
Oscillator Frequency
V_FB = 0.8V
V_FB = 0V
R_PFET
R_DS(ON) of P-Channel FET
I_SW = 100mA
R_NFET
R_DS(ON) of N-Channel FET
I_SW = –100mA
I_LSW
SW Leakage
V_RUN = 0V, V_SW = 0V or 5V, V_IN = 5V
V_RUN
RUN Threshold
I_RUN
RUN Leakage Current
V_MODE
MODE Threshold
I_MODE
MODE Leakage Current
Burst Mode is a registered trademark of Linear Technology Corporation.
●
±30
nA
375 500 625
mA
● 0.784 0.8 0.816
V
●
20
50
80
mV
●
0.04
0.4
%/V
0.5
%
● 2.5
5.5
V
300 400
µA
20
35
µA
0.1
1
µA
● 1.2
1.5
1.8
MHz
210
kHz
0.7
0.85
Ω
0.6
0.90
Ω
±0.01 ±1
µA
● 0.3
1
1.5
V
●
±0.01 ±1
µA
● 0.3
1.5
2
V
●
±0.01 ±1
µA
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: The LTC3405A is tested in a proprietary test mode that connects
V_FB to the output of the error amplifier.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
3405afa
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