LTC3406B-2 Datasheet, PDF (2/16 Pages) Linear Technology – 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

LTC3406B-2
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage .................................. – 0.3V to 6V
RUN, V_FB Voltages ..................................... – 0.3V to V_IN
SW Voltage (DC) ......................... – 0.3V to (V_IN + 0.3V)
P-Channel Switch Source Current (DC) ............. 800mA
N-Channel Switch Sink Current (DC) ................. 800mA
Peak SW Sink and Source Current ........................ 1.3A
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Maximum Junction Temperature (Notes 3, 6) ..... 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
5 V_FB
4 V_IN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T_JMAX = 125°C, θ_JA = 250°C/ W, θ_JC = 90°C/ W
ORDER PART
NUMBER
LTC3406B-2ES5
S5 PART MARKING
LTAGH
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_VFB
Feedback Current
±30
V_FB
Regulated Feedback Voltage
(Note 4) T_A = 25°C
(Note 4) 0°C ≤ T_A ≤ 85°C
(Note 4) –40°C ≤ T_A ≤ 85°C
0.5880 0.6 0.6120
0.5865 0.6 0.6135
● 0.5850 0.6 0.6150
∆V_FB
∆V_OVL
Reference Voltage Line Regulation
∆Output Overvoltage Lockout
V_IN = 2.5V to 5.5V (Note 4)
∆V_OVL = V_OVL – V_FB, LTC3406B
●
0.04
0.4
●
20
50
80
I_PK
Peak Inductor Current
V_IN = 3V, V_FB = 0.5V or V_OUT = 90%,
Duty Cycle < 35%
0.75
1
1.25
V_LOADREG Output Voltage Load Regulation
0.5
V_IN
Input Voltage Range
● 2.5
5.5
I_S
Input DC Bias Current
Shutdown
f_OSC
Oscillator Frequency
(Note 5)
V_FB = 0.5V or V_OUT = 90%
V_RUN = 0V, V_IN = 4.2V
V_FB = 0.6V or V_OUT = 100%
V_FB = 0V or V_OUT = 0V
350 500
0.1
1
● 1.8
2.25
2.7
310
R_PFET
R_NFET
R_DS(ON) of P-Channel FET
R_DS(ON) of N-Channel FET
I_SW = 100mA
I_SW = –100mA
0.4
0.5
0.35 0.45
I_LSW
SW Leakage
V_RUN = 0V, V_SW = 0V or 5V, V_IN = 5V
±0.01 ±1
V_RUN
I_RUN
RUN Threshold
RUN Leakage Current
● 0.3
1
1.5
●
±0.01 ±1
UNITS
nA
V
V
V
%/V
mV
A
%
V
µA
µA
MHz
kHz
Ω
Ω
µA
V
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3406B-2ES5 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:
LTC3406B-2ES5: T_J = T_A + (P_D)(250°C/W)
Note 4: The LTC3406B-2ES5 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.
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
2
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