Datasheet

2
LTC3251/
LTC3251-1.2/LTC3251-1.5
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ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
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Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Minimum Operating Voltage (Notes 4,5) ● 2.7 V
V
IN
Maximum Operating Voltage (Note 5) ● 5.5 V
V
IN
Continuous Mode Operating Current I
OUT
= 0mA, V
MD0
= 0, V
MD1
= V
IN
● 35 mA
Spread Spectrum Disabled MODE = V
IN
● 3.75 6 mA
V
IN
Burst Mode Operating Current I
OUT
= 0mA, V
MD0
= V
IN
, V
MD1
= 0 ● 35 60 µA
Spread Spectrum Disabled MODE = V
IN
● 35 60 µA
V
IN
Super Burst Mode Operating Current I
OUT
= 0mA, V
MD0
= V
IN
, V
MD1
= V
IN
● 10 15 µA
Spread Spectrum Disabled MODE = V
IN
● 10 15 µA
V
IN
Shutdown Current V
MD0
= 0V, V
MD1
= 0V (Note 5) ● 0.01 1 µA
V
FB
Regulation Voltage (LTC3251) I
OUT
= 0mA, 2.7V ≤ V
IN
≤ 5.5V ● 0.78 0.8 0.82 V
V
OUT
Regulation Voltage (LTC3251-1.2) I
OUT
≤ 200mA, 2.7V ≤ V
IN
≤ 5.5V (Note 5) ● 1.15 1.2 1.25 V
Continuous Mode or Burst Mode Operation I
OUT
≤ 300mA, 2.8V ≤ V
IN
≤ 5.5V (Note 5) ● 1.15 1.2 1.25 V
I
OUT
≤ 500mA, 3V ≤ V
IN
≤ 5.5V (Note 5) 1.15 1.2 1.25 V
V
OUT
Regulation Voltage (LTC3251-1.2) I
OUT
≤ 40mA ● 1.15 1.2 1.25 V
Super Burst Operation
V
OUT
Regulation Voltage (LTC3251-1.5) I
OUT
≤ 100mA, 3.1V ≤ V
IN
≤ 5.5V (Note 5) ● 1.44 1.5 1.56 V
Continuous Mode or Burst Mode Operation I
OUT
≤ 200mA, 3.2V ≤ V
IN
≤ 5.5V (Note 5) ● 1.44 1.5 1.56 V
I
OUT
≤ 300mA, 3.3V ≤ V
IN
≤ 5.5V (Note 5) ● 1.44 1.5 1.56 V
I
OUT
≤ 500mA, 3.5V ≤ V
IN
≤ 5.5V (Note 5) 1.44 1.5 1.56 V
V
OUT
Regulation Voltage (LTC3251-1.5) I
OUT
≤ 40mA ● 1.44 1.5 1.56 V
Super Burst Operation
I
OUT
Continuous Output Current (LTC3251) V
MD0
= 0, V
MD1
= V
IN
or V
MD0
= V
IN
, V
MD1
= 0 ● 500 mA
I
OUT
Super Burst Output Current (LTC3251) V
MD0
= V
IN
, V
MD1
= V
IN
● 40 mA
Load Regulation (LTC3251) 0mA ≤ I
OUT
≤ 500mA, Referred to FB Pin 0.045 mV/mA
ORDER PART
NUMBER
MSE PART MARKING
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
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
LTC3251EMSE
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.
LTB4
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
ORDER PART
NUMBER
MSE PART MARKING
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
LTC3251EMSE-1.2
LTC3251EMSE-1.5
LTAGM
LTABE
1
2
3
4
5
MD0
V
IN
C1
+
C1
–
GND
10
9
8
7
6
MODE
MD1
C2
+
V
OUT
C2
–
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
11
1
2
3
4
5
MD0
V
IN
C1
+
C1
–
GND
10
9
8
7
6
MODE
MD1
C2
+
V
OUT
C2
–
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
11
(Notes 1, 7)
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/