Datasheet

2
LTC1751/LTC1751-3.3/LTC1751-5
ORDER PART
NUMBER
LTC1751EMS8
LTC1751EMS8-3.3
LTC1751EMS8-5
T
JMAX
= 150°C, θ
JA
= 160°C/W
*PGOOD ON LTC1751-3.3/LTC1751-5
FB ON LTC1751
Consult factory for parts specified with wider operating temperature ranges.
The ● denotes specifications which apply over the full specified
temperature range, otherwise specifications are at T
A
= 25°C. C
FLY
= 1µF, C
IN
= 10µF, C
OUT
= 10µF unless otherwise noted.
(Note 1)
V
IN
to GND.................................................. –0.3V to 6V
PGOOD, FB, V
OUT
to GND ........................... –0.3V to 6V
SS, SHDN to GND........................ –0.3V to (V
IN
+ 0.3V)
V
OUT
Short-Circuit Duration............................. Indefinite
I
OUT
(Note 2)....................................................... 125mA
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
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
ELECTRICAL CHARACTERISTICS
1
2
3
4
FB/PGOOD*
V
OUT
V
IN
GND
8
7
6
5
SS
SHDN
C
+
C
–
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
LTKL
LTKN
LTKP
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LTC1751-3.3
V
IN
Input Supply Voltage ● 2 4.4 V
V
OUT
Output Voltage 2V ≤ V
IN
≤ 4.4V, I
OUT
≤ 40mA ● 3.17 3.3 3.43 V
2.5V ≤ V
IN
≤ 4.4V, I
OUT
≤ 80mA ● 3.17 3.3 3.43 V
I
CC
Operating Supply Current 2V ≤ V
IN
≤ 4.4V, I
OUT
= 0mA, SHDN = V
IN
● 18 40 µA
V
R
Output Ripple V
IN
= 2.5V, I
OUT
= 40mA 68 mV
P-P
η Efficiency V
IN
= 2V, I
OUT
= 40mA 80 %
LTC1751-5
V
IN
Input Supply Voltage ● 2.7 5.5 V
V
OUT
Output Voltage 2.7V ≤ V
IN
≤ 5.5V, I
OUT
≤ 50mA ● 4.8 5 5.2 V
3V ≤ V
IN
≤ 5.5V, I
OUT
≤ 100mA ● 4.8 5 5.2 V
I
CC
Operating Supply Current 2.7V ≤ V
IN
≤ 5.5V, I
OUT
= 0mA, SHDN = V
IN
● 20 50 µA
V
R
Output Ripple V
IN
= 3V, I
OUT
= 50mA 75 mV
P-P
η Efficiency V
IN
= 3V, I
OUT
= 50mA 82 %
LTC1751
V
IN
Input Supply Voltage ● 2 5.5 V
I
CC
Operating Supply Current 2V ≤ V
IN
≤ 5.5V, I
OUT
= 0mA, SHDN = V
IN
(Note 4 ) ● 16 40 µA
V
FB
FB Regulation Voltage 2V ≤ V
IN
≤ 5.5V, I
OUT
≤ 20mA ● 1.157 1.205 1.253 V
I
FB
FB Input Current V
FB
= 1.3V ● –50 50 nA
R
OUT
Open-Loop Charge Pump Strength V
IN
= 2V, V
OUT
= 3.3V (Note 5) ● 8.5 20 Ω
V
IN
= 2.7V, V
OUT
= 5V (Note 5) ● 6.0 12 Ω