Datasheet
3
LTC1266
LTC1266-3.3/LTC1266-5
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SENSE 1
Current Sense Threshold V
BINH
= 0V
(Burst Mode Operation Enabled)
LTC1266 V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 + 25mV (Forced) 25 mV
V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 – 25mV (Forced) ● 135 155 175 mV
LTC1266-3.3 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
LTC1266-5 V
SENSE
–
= V
OUT
+ 100mV (Forced) 25 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
V
SENSE 2
Current Sense Threshold V
BINH
= 2.1V
(Burst Mode Operation Disabled)
LTC1266 V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 + 25mV (Forced) –20 mV
V
SENSE
–
= 3.3V, V
FB
= V
OUT
/2.64 – 25mV (Forced) ● 135 155 175 mV
LTC1266-3.3 V
SENSE
–
= V
OUT
+ 100mV (Forced) –20 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
LTC1266-5 V
SENSE
–
= V
OUT
+ 100mV (Forced) –20 mV
V
SENSE
–
= V
OUT
– 100mV (Forced) ● 135 155 175 mV
V
SHDN
Shutdown Pin Threshold 0.6 0.8 2 V
I
SHDN
Shutdown Pin Input Current 0V < V
SHDN
< 8V, V
IN
= 16V 1.2 5 µA
I
PINV
Phase Invert Pin Input Current 0V < V
PINV
< 18V, V
IN
= 18V 0.2 1 µA
V
BINH
Burst Mode Operation V
IN
= 7V 0.8 1.2 2 V
Inhibit Pin Threshold
I
BINH
Burst Mode Operation 0V < V
BINH
< 18V, V
IN
= 18V 0.2 1 µA
Inhibit Pin Input Current
I
CT
C
T
Pin Discharge Current V
SENSE
+
= V
OUT
– 100mV, V
SENSE
–
= V
OUT
– 300mV 50 70 90 µA
V
OUT
= 0V 2 10 µA
t
OFF
Off-Time (Note 4) C
T
= 390pF, I
LOAD
= 700mA 4 5 6 µs
t
MAX
Max On-Time V
OUT
= 0V, V
IN
= 18V 60 µs
t
r
, t
f
Driver Output Transition Times (Note 7) C
L
= 3000pF (Pins 1, 16), V
IN
= 6V 100 200 ns
V
CLAMP
Output Voltage Clamp in V
BINH
= 2.1V
Burst Mode Operation Inhibit
LTC1266 Measured at V
FB
1.30 V
LTC1266-3.3 Measured at V
SENSE
–
3.43
V
LTC1266-5 Measured at V
SENSE
–
5.20 V
V
LBTRIP
Low-Battery Trip Point V
IN
= 5V 1.14 1.25 1.35 V
V
IN
= 12V 1.17 1.30 1.42 V
I
LBLEAK
Max Leakage Current Into Pin 14 V
LBOUT
= 18V, V
LBIN
= 2V 25 200 nA
I
LBSINK
Max Sink Current Into Pin 14 V
LBOUT
= 1V, V
LBIN
= 0V, 2.5V < V
IN
< 18V 1 8 mA
I
LBIN
Max Leakage Current Into Pin 13 V
LBIN
= 18V 0.2 1 µA
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= V
BINH
= 0V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
FB
Feedback Voltage V
IN
= 9V, I
LOAD
= 700mA, V
PINV
= V
PWR
= 14V,
Topside Switch = N-Ch
LTC1266AIS 1.246 1.265 1.290 V
LTC1266CS, LTC1266IS 1.210 1.265 1.290 V
V
OUT
Regulated Output Voltage V
IN
= 9V, I
LOAD
= 700mA, V
PINV
= V
PWR
= 14,
Topside Switch = N-Ch
LTC1266CS-3.3, LTC1266IS-3.3 3.23 3.33 3.43 V
LTC1266CS-5, LTC1266IS-5 4.90 5.05 5.20 V
–40°C < T
A
< 85°C (Note 5), V
IN
= 10V, unless otherwise noted.