Datasheet

2
LTC1144
WU
U
PACKAGE
/
O
RDER I FOR ATIO
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
(Note 1)
Supply Voltage (V
+
) (Transient) .............................. 20V
Supply Voltage (V
+
) (Operating)............................. 18V
Input Voltage on Pins 1, 6, 7
(Note 2) ............................ –0.3V < V
IN
< (V
+
) + 0.3V
Output Short-Circuit Duration
V
+
≤ 10V .................................................... Indefinite
V
+
≤ 15V ........................................................ 30 sec
V
+
≤ 20V ............................................. Not Protected
Power Dissipation............................................. 500mW
Operating Temperature Range
LTC1144C................................................ 0°C to 70°C
LTC1144I............................................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
TOP VIEW
1
2
3
4
8
7
6
5
BOOST
CAP
+

GND
CAP
–
V
+

OSC
SHDN
V
OUT
S8 PACKAGE
8-LEAD PLASTIC SOIC
T
JMAX
= 110°C, θ
JA
= 130°C/W
1
2
3
4
8
7
6
5

TOP VIEW
BOOST
CAP
+

GND
CAP
–
V
+

OSC
SHDN
V
OUT
N8 PACKAGE
8-LEAD PLASTIC DIP
T
JMAX
= 110°C, θ
JA
= 100°C/W
S8 PART MARKING
1144
1144I
LTC1144CS8
LTC1144IS8
LTC1144CN8
LTC1144IN8
ORDER PART
NUMBER
Consult factory for Military grade parts.
The ● denotes specifications which apply over the full operating
temperature range; all other limits and typicals at T
A
= 25°C.
Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2: Connecting any input terminal to voltages greater than V
+
or less
than ground may cause destructive latch-up. It is recommended that no
inputs from sources operating from external supplies be applied prior to
power-up of the LTC1144.
Note 3: f
OSC
is tested with C
OSC
= 100pF to minimize the effects of test
fixture capacitance loading. The 0pF frequency is correlated to this 100pF
test point, and is intended to simulate the capacitance at pin 7 when the
device is plugged into a test socket and no external capacitor is used.
LTC1144C LTC1144I
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Supply Voltage Range R
L
= 10k ● 2 18 2 18 V
I
S
Supply Current R
L
= ∞, Pins 1, 6 No Connection, 1.1 1.1 mA
f
OSC
= 10kHz ● 1.3 1.6 mA
SHDN = 0V, R
L
= ∞, Pins 1, 7 ● 0.008 0.03 0.008 0.035 mA
No Connection
V
+
= 5V, R
L
= ∞, Pins 1, 6 0.10 0.10 mA
No Connection, f
OSC
= 4kHz ● 0.13 0.15 mA
V
+
= 5V, SHDN = 0V, R
L
= ∞, ● 0.002 0.015 0.002 0.018 mA
Pins 1, 7 No Connection
R
OUT
Output Resistance V
+
= 15V, I
L
= 20mA at 10kHz 56 100 56 100 Ω
● 120 140 Ω
V
+
= 5V, I
L
= 3mA at 4kHz ● 90 250 90 300 Ω
f
OSC
Oscillator Frequency V
+
= 15V (Note 3) 10 10 kHz
V
+
= 5V 4 4 kHz
Power Efficiency R
L
= 2k at 10kHz ● 90 93 90 93 %
Voltage Conversion Efficiency R
L
= ∞ ● 97.0 99.9 97.0 99.9 %
Oscillator Sink or Source Current V
+
= 5V (V
OSC
= 0V to 5V) 0.5 0.5 µA
V
+
= 15V (V
OSC
= 0V to 15V) 4 4 µA
E
LECTR
IC
AL C CHARA TERIST
ICS
V
+
= 15V, C
OSC
= 0pF, T
A
= 25°C, Test Circuit Figure 1, unless otherwise noted.