LTC3250 Datasheet, PDF (2/12 Pages) Linear Technology – High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

LTC3250-1.5/LTC3250-1.2
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN to GND ................................................... –0.3V to 6V
SHDN to GND ............................... –0.3V to (V_IN + 0.3V)
I_OUT (Note 2)....................................................... 350mA
Operating Ambient Temperature Range (Note 3)
........................................................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
V_IN 1
GND 2
SHDN 3
TOP VIEW
6 C⁺
5 V_OUT
4 C^–
S6 PACKAGE
6-LEAD PLASTIC SOT-23
T_JMAX = 150°C, θ_JA = 230°C/W,
θ_JC = 102°C/W
ORDER PART
NUMBER
LTC3250ES6-1.5
LTC3250ES6-1.2
S6 PART MARKING
LTZE
LTAGJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V, C_FLY = 1µF, C_IN = 1µF, C_OUT = 4.7µF unless otherwise noted.
SYMBOL
V_IN
V_OUT
I_IN
V_RB
V_RC
f_OSC
V_IH
V_IL
I_IH
I_IL
t_ON
R_OL
PARAMETER
LTC3250-1.5 Operating Voltage Range
LTC3250-1.2 Operating Voltage Range
LTC3250-1.5 Output Voltage Range
LTC3250-1.2 Output Voltage Range
Operating Current
Shutdown Current
Burst Mode Operation Output Ripple
Continuous Mode Output Ripple
Switching Frequency
SHDN Input Hi Voltage
SHDN Input Low Voltage
SHDN Input Current
SHDN Input Current
Turn On Time
LTC3250-1.5 Load Regulation
LTC3250-1.2 Load Regulation
Line Regulation
Open-Loop Output Impedance
CONDITIONS
I_OUT ≤ 50mA 3.1V ≤ V_IN ≤ 5.5V
I_OUT ≤ 100mA 3.2V ≤ V_IN ≤ 5.5V
I_OUT ≤ 250mA 3.5V ≤ V_IN ≤ 5V
I_OUT ≤ 150mA 2.7V < V_IN < 5.5V
I_OUT ≤ 250mA 2.9V ≤ V_IN ≤ 5V
I_OUT = 0mA
SHDN = 0V
SHDN = V_IN
SHDN = 0V
R_LOAD = 6Ω
0 ≤ I_OUT ≤ 250mA
0 ≤ I_OUT ≤ 250mA
I_OUT = 250mA
I_OUT = 250mA (Note 4)
MIN TYP MAX UNITS
q 3.1
5.5
V
q 2.7
5.5
V
q 1.44
1.5
1.56
V
q 1.44
1.5
1.56
V
1.44
1.5
1.56
V
q 1.15
1.2
1.25
V
1.15
1.2
1.25
V
q
35
60
µA
q
0.01
1
µA
12
mV_P-P
4
mV_P-P
q 1.2
1.5
1.8
MHz
q 1.2
0.8
V
q
0.8
0.4
V
q –1
1
µA
q –1
1
µA
0.8
ms
0.15
mV/mA
0.12
mV/mA
0.2
%/V
1.0
Ω
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Based on long term current density limitations.
Note 3: The LTC3250-1.5E/LTC3250-1.2E are guaranteed to meet
specified performance from 0°C to 70°C. Specifications over the –40°C
and 85°C operating temperature range are assured by design
characterization and correlation with statistical process controls.
Note 4: Output not in regulation; R_OL = (V_IN/2 - V_OUT)/I_OUT.
Note 5: 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.
3250fa
2