LTC1266 Linear Technology, LTC1266 Datasheet - Page 4

• Manufacturer Part Number: LTC1266
• Description: Synchronous Regulator Controller for N- or P-Channel MOSFETs
• Manufacturer: Linear Technology

SYMBOL
V
Sense 2
V
t
TYPICAL PERFOR
LTC1266
LTC1266-3.3/LTC1266-5
4
ELECTRICAL C
The
temperature range.
Note 1: T
dissipation P
Note 2: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
OFF
SENSE1
SHDN
100
T
95
90
85
80
75
70
J
= T
denotes specifications which apply over the full operating
3
Efficiency vs Input Voltage
FIGURE 1 CIRCUIT
J
A
is calculated from the ambient temperature T
+ (P
PARAMETER
Current Sense Threshold
Current Sense Threshold
Shutdown Pin Threshold
Off-Time (Note 3)
I
LOAD
D
(Burst Mode Operation Enabled)
(Burst Mode Operation Disabled)
4
LTC1266
LTC1266-3.3, LTC1266-5
LTC1266
LTC1266-3.3, LTC1266-5
according to the following formula:
D
= 5A
INPUT VOLTAGE (V)
110 C/W)
5
6
I
LOAD
HARA TERISTICS
I
LOAD
= 100mA
7
= 2.5A
W
LTC1266 • TPC01
8
A
C
U
9
CE
CONDITIONS
V
V
V
V
V
V
V
V
V
V
C
BINH
SENSE
SENSE
SENSE
SENSE
BINH
SENSE
SENSE
SENSE
SENSE
T
C
= 390pF, I
A
HARA TERISTICS
– 40
–20
–30
–10
and power
40
30
20
10
= 0V
= 2.1V
–
–
–
–
–
–
–
–
0
Line Regulation
3
= 3.3V, V
= 3.3V, V
= V
= V
3.3V, V
3.3V, V
= V
= V
FIGURE 1 CIRCUIT
I
LOAD
OUT
OUT
OUT
OUT
LOAD
4
= 1A
FB
FB
– 100mV (Forced)
+ 100mV (Forced)
– 100mV (Forced)
+ 100mV (Forced)
C
FB
FB
= 700mA
= V
= V
INPUT VOLTAGE (V)
= V
= V
5
OUT
OUT
OUT
OUT
/2.64 + 25mV (Forced)
/2.64 – 25mV (Forced)
/2.64 + 25mV (Forced)
/2.64 – 25mV (Forced)
Note 3: In applications where R
time increases approximately 40%.
Note 4: The LTC1266, LTC1266-3.3, and LTC1266-5 are not tested and
not quality assurance sampled at – 40 C and 85 C. These specifications
are guaranteed by design and/or correlation.
Note 5: Unless otherwise noted the specifications for the LTC1266A are
the same as those for the LTC1266.
6
7
LTC1266 • TPC02
8
9
–10
–20
–50
–30
–40
SENSE
20
10
0
0
Load Regulation
FIGURE 1 CIRCUIT
OPERATION INHIBITED)
is placed at ground potential, the off-
V
IN
MIN
0.55
135
135
130
130
3.8
= 5V (Burst Mode
1
V
OPERATION ENABLED)
IN
LOAD CURRENT (A)
= 9V (Burst Mode
V
IN
2
TYP
155
155
–20
155
–20
155
0.8
25
25
= 5V
5
3
MAX
180
180
185
185
6.5
2
4
LTC1266 • TPC03
UNITS
mV
mV
mV
mV
mV
mV
mV
mV
V
s
5