Datasheet

2
LTC1911-1.5/LTC1911-1.8
1911f
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage ● 2.7 5.5 V
V
OUT
LTC1911-1.5, 0mA ≤ I
OUT
≤ 250mA, V
IN
= 2.7V to 5.5V ● 1.44 1.5 1.56 V
LTC1911-1.8, 0mA ≤ I
OUT
≤ 250mA, V
IN
= 2.7V to 5.5V ● 1.73 1.8 1.87 V
V
IN
Operating Current I
OUT
= 0mA, V
IN
= 2.7V to 5.5V ● 180 350 µA
V
IN
Shutdown Current SS/SHDN = 0V, V
IN
= 2.7V to 5.5V ● 10 20 µA
Output Ripple I
OUT
= 10mA 5 mV
P-P
I
OUT
= 250mA 12 mV
P-P
V
OUT
Short-Circuit Current V
OUT
= 0V 600 mA
Switching Frequency Oscillator Free Running 1.2 1.5 1.8 MHz
SS/SHDN Input Threshold ● 0.3 0.6 1 V
SS/SHDN Soft-Start Current V
SS/SHDN
= 0V (Note 3) ● –5 –2 –1 µA
V
SS/SHDN
= V
IN
0.01 µA
Turn-On Time C
SS
= 0pF, V
IN
= 3.3V 0.03 ms
C
SS
= 10nF, V
IN
= 3.3V 10 ms
Load Regulation 0V ≤ I
OUT
≤ 250mA 0.13 mV/mA
Line Regulation 0V ≤ I
OUT
≤ 250mA 0.3 %/V
(Note 1)
V
IN
to GND...................................................–0.3V to 6V
SS/SHDN to GND........................ – 0.3V to (V
IN
+ 0.3V)
V
OUT
Short-Circuit Duration............................ Indefinite
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................. –40°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ORDER PART
NUMBER
LTC1911EMS8-1.5
LTC1911EMS8-1.8
T
JMAX
= 125°C, θ
JA
= 160°C/W
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
IN
= 3.6V, C1 = 1µF, C2 = 1µF, C
IN
= 10µF, C
OUT
= 10µF unless
otherwise noted.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
MS8 PART MARKING
1
2
3
4
V
IN
C2
+
C2
–
GND
8
7
6
5
SS/SHDN
C1
+
V
OUT
C1
–
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
LTMY
LTNU
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1911E is guaranteed to meet specified performance 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: Currents flowing into the device are positive polarity. Currents
flowing out of the device are negative polarity.
Consult LTC Marketing for parts specified with wider operating temperature ranges.