Datasheet

LTC6992-1/LTC6992-2/
LTC6992-3/LTC6992-4
4
69921234fc
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Test conditions are V
+
= 2.25V to 5.5V, V
MOD
= 0V to V
SET
,
DIVCODE = 0 to 15 (N
DIV
= 1 to 16,384), R
SET
= 50k to 800k, R
LOAD
= 5k, C
LOAD
= 5pF unless otherwise noted.
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
+
Operating Supply Voltage Range
l
2.25 5.5 V
Power-On Reset Voltage
l
1.95 V
I
S
Supply Current R
L
= ∞, R
SET
= 50k,
N
DIV
= 1
V
+
= 5.5V
l
365 450 µA
V
+
= 2.25V
l
225 285 µA
R
L
= ∞, R
SET
= 50k,
N
DIV
= 4
V
+
= 5.5V
l
350 420 µA
V
+
= 2.25V
l
225 280 µA
R
L
= ∞, R
SET
= 50k,
N
DIV
≥ 16
V
+
= 5.5V
l
325 390 µA
V
+
= 2.25V
l
215 265 µA
R
L
= ∞, R
SET
= 800k,
N
DIV
= 1 to 16,384
V
+
= 5.5V
l
120 170 µA
V
+
= 2.25V
l
105 150 µA
Analog Inputs
V
SET
Voltage at SET Pin
l
0.97 1.00 1.03 V
∆V
SET
/∆T V
SET
Drift Over Temperature
l
±75 µV/°C
R
SET
Frequency-Setting Resistor
l
50 800 kΩ
MOD Pin Input Capacitance 2.5 pF
MOD Pin Input Current
l
±10 nA
V
MOD,HI
V
MOD
Voltage for Maximum
Duty Cycle
LTC6992-1/LTC6992-4, POL = 0, D = 100%
LTC6992-2/LTC6992-3, POL = 0, D = 95%
l
0.90• V
SET
0.86• V
SET
0.936•V
SET
V
V
V
MOD,LO
V
MOD
Voltage for Minimum
Duty Cycle
LTC6992-1/LTC6992-3, POL = 0, D = 0%
LTC6992-2/LTC6992-4, POL = 0, D = 5%
l
0.064• V
SET
0.10• V
SET
0.14• V
SET
V
V
V
DIV
DIV Pin Voltage
l
0 V
+
V
∆V
DIV
/∆V
+
DIV Pin Valid Code Range (Note 5) Deviation from Ideal
V
DIV
/V
+
= (DIVCODE + 0.5)/16
l
±1.5 %
DIV Pin Input Current
l
±10nA
Digital Output
I
OUT(MAX)
Output Current V
+
= 2.7V to 5.5V ±20 mA
V
OH
High Level Output Voltage (Note 7) V
+
= 5.5V I
OUT
= –1mA
I
OUT
= –16mA
l
l
5.45
4.84
5.48
5.15
V
V
V
+
= 3.3V I
OUT
= –1mA
I
OUT
= –10mA
l
l
3.24
2.75
3.27
2.99
V
V
V
+
= 2.25V I
OUT
= –1mA
I
OUT
= -8mA
l
l
2.17
1.58
2.21
1.88
V
V
V
OL
Low Level Output Voltage (Note 7) V
+
= 5.5V I
OUT
= 1mA
I
OUT
= 16mA
l
l
0.02
0.26
0.04
0.54
V
V
V
+
= 3.3V I
OUT
= 1mA
I
OUT
= 10mA
l
l
0.03
0.22
0.05
0.46
V
V
V
+
= 2.25V I
OUT
= 1mA
I
OUT
= 8mA
l
l
0.03
0.26
0.07
0.54
V
V
t
r
Output Rise Time (Note 8) V
+
= 5.5V, R
LOAD
= ∞
V
+
= 3.3V, R
LOAD
= ∞
V
+
= 2.25V, R
LOAD
= ∞
1.1
1.7
2.7
ns
ns
ns
t
f
Output Fall Time (Note 8) V
+
= 5.5V, R
LOAD
= ∞
V
+
= 3.3V, R
LOAD
= ∞
V
+
= 2.25V, R
LOAD
= ∞
1.0
1.6
2.4
ns
ns
ns