LTC3251_15 Datasheet, PDF (2/16 Pages) Linear Technology – 500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter

LTC3251/
LTC3251-1.2/LTC3251-1.5
ABSOLUTE AXI U RATI GS (Notes 1, 7)
V_IN to GND ................................................... –0.3V to 6V
MD0, MD1, MODE and FB to GND . – 0.3V to (V_IN + 0.3V)
I_OUT (Note 2) ...................................................... 650mA
Operating 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
MD0 1
CV1^IN+
2
3
C1^– 4
GND 5
TOP VIEW
11
10 MODE
9 MD1
8 C2⁺
7
6
VC_O2–UT
ORDER PART
NUMBER
LTC3251EMSE
MD0 1
CV1^IN+
2
3
C1^– 4
GND 5
TOP VIEW
11
10 MODE
9 MD1
8 C2⁺
7
6
VC2_O–UT
MSE PACKAGE
10-LEAD PLASTIC MSOP
EXPOSED PAD IS GND (PIN 11),
MUST BE SOLDERED TO PCB
T_JMAX = 125°C, θ_JA = 40°C/W, θ_JC = 10°C/W
MSE PART MARKING
LTB4
MSE PACKAGE
10-LEAD PLASTIC MSOP
EXPOSED PAD IS GND (PIN 11),
MUST BE SOLDERED TO PCB
T_JMAX = 125°C, θ_JA = 40°C/W, θ_JC = 10°C/W
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC3251EMSE-1.2
LTC3251EMSE-1.5
MSE PART MARKING
LTAGM
LTABE
ELECTRICAL CHARACTERISTICS _{The ● denotes the specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V, C1 = C2 = 1µF, C_IN = 1µF, C_OUT = 10µF,
V_MODE = 0V for LTC3251-1.2V or LTC3251-1.5, V_OUT = 1.5V for LTC3251, all capacitors ceramic, unless otherwise noted.
PARAMETER
V_IN Minimum Operating Voltage
V_IN Maximum Operating Voltage
V_IN Continuous Mode Operating Current
V_IN Burst Mode Operating Current
V_IN Super Burst Mode Operating Current
V_IN Shutdown Current
V_FB Regulation Voltage (LTC3251)
V_OUT Regulation Voltage (LTC3251-1.2)
Continuous Mode or Burst Mode Operation
V_OUT Regulation Voltage (LTC3251-1.2)
Super Burst Operation
V_OUT Regulation Voltage (LTC3251-1.5)
Continuous Mode or Burst Mode Operation
V_OUT Regulation Voltage (LTC3251-1.5)
Super Burst Operation
I_OUT Continuous Output Current (LTC3251)
I_OUT Super Burst Output Current (LTC3251)
Load Regulation (LTC3251)
CONDITIONS
(Notes 4,5)
●
(Note 5)
●
I_OUT = 0mA, V_MD0 = 0, V_MD1 = V_IN
●
Spread Spectrum Disabled MODE = V_IN
●
I_OUT = 0mA, V_MD0 = V_IN, V_MD1 = 0
●
Spread Spectrum Disabled MODE = V_IN
●
I_OUT = 0mA, V_MD0 = V_IN, V_MD1 = V_IN
●
Spread Spectrum Disabled MODE = V_IN
●
V_MD0 = 0V, V_MD1 = 0V (Note 5)
●
I_OUT = 0mA, 2.7V ≤ V_IN ≤ 5.5V
●
I_OUT ≤ 200mA, 2.7V ≤ V_IN ≤ 5.5V (Note 5)
●
I_OUT ≤ 300mA, 2.8V ≤ V_IN ≤ 5.5V (Note 5)
●
I_OUT ≤ 500mA, 3V ≤ V_IN ≤ 5.5V (Note 5)
I_OUT ≤ 40mA
●
I_OUT ≤ 100mA, 3.1V ≤ V_IN ≤ 5.5V (Note 5)
●
I_OUT ≤ 200mA, 3.2V ≤ V_IN ≤ 5.5V (Note 5)
●
I_OUT ≤ 300mA, 3.3V ≤ V_IN ≤ 5.5V (Note 5)
●
I_OUT ≤ 500mA, 3.5V ≤ V_IN ≤ 5.5V (Note 5)
I_OUT ≤ 40mA
●
V_MD0 = 0, V_MD1 = V_IN or V_MD0 = V_IN, V_MD1 = 0 ●
V_MD0 = V_IN, V_MD1 = V_IN
●
0mA ≤ I_OUT ≤ 500mA, Referred to FB Pin
MIN TYP MAX
2.7
5.5
3
5
3.75
6
35
60
35
60
10
15
10
15
0.01
1
0.78
0.8
0.82
1.15
1.2
1.25
1.15
1.2
1.25
1.15
1.2
1.25
1.15
1.2
1.25
UNITS
V
V
mA
mA
µA
µA
µA
µA
µA
V
V
V
V
V
1.44
1.5
1.56
V
1.44
1.5
1.56
V
1.44
1.5
1.56
V
1.44
1.5
1.56
V
1.44
1.5
1.56
V
500
40
0.045
mA
mA
mV/mA
32511215fb
2