LTC1159 Linear Technology, LTC1159 Datasheet - Page 3

• Manufacturer Part Number: LTC1159
• Description: High Efficiency Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

– 40 C T
SYMBOL
V
V
V
V
V
V
I
I
t
t
SYMBOL
V
V
I
I
V
V
V
V
t
The
temperature range.
Note 1: T
dissipation P
Note 2: On LTC1159 versions which have a SHDN1 pin, it must be at
ground potential for testing.
Note 3: The LTC1159 V
MOSFET driver currents. When V
ELECTRICAL C
SHDN2
CT
OFF
r
IN
EXTVCC
OFF
EXT
P-GATE
SENSE +
SENSE
SNDN1
SHDN2
, t
FB
OUT
CC
SENSE +
SENSE –
SHDN2
LTC1159CG, LTC1159CG-3.3, LTC1159CG-5: T
LTC1159CN, LTC1159CN-3.3, LTC1159CN-5: T
LTC1159CS, LTC1159CS-3.3, LTC1159CS-5: T
f
– V
denotes specifications which apply over the full operating
–
– V
CC
–
–
J
is calculated from the ambient temperature T
IN
A
D
according to the following formulas:
85 C (Note 5)
PARAMETER
EXTV
P-Gate to Source Voltage (Off)
Current Sense Threshold Voltage
SHDN1 Threshold
LTC1159CG, LTC1159-3.3, LTC1159-5
SHDN2 Threshold
Shutdown 2 Input Current
C
Off-Time (Note 4)
Driver Output Transition Times
PARAMETER
Feedback Voltage (LTC1159 Only)
Regulated Output Voltage
V
EXTV
Internal Regulator Voltage
Current Sense Threshold Voltage
SHDN2 Threshold
Off-Time (Note 4)
T
IN
Pin Discharge Current
LTC1159
LTC1159-3.3
LTC1159-5
LTC1159-3.3
LTC1159-5
Normal
Shutdown
Pin Current (Note 3)
CC
CC
IN
Switch Drop
Pin Current (Note 3)
and EXTV
HARA TERISTICS
CC
CC
power is derived from the output via
current measurements exclude
C
J
J
J
= T
= T
= T
A
A
A
+ (P
+ (P
+ (P
A
and power
CONDITIONS
V
V
V
V
V
V
V
V
V
V
V
V
C
C
CONDITIONS
V
I
I
V
V
V
V
EXTV
V
Low Threshold (Forced)
High Threshold (Forced)
C
LOAD
LOAD
IN
IN
IN
SENSE
SENSE
SENSE –
SENSE –
SENSE
SENSE
SHDN2
OUT
OUT
T
L
IN
IN
IN
IN
IN
IN
T
D
D
D
= 390pF, I
= 3000pF (Pins P-Drive and N-Gate), V
= 390pF, I
= 12V to 40V, EXTV
= 12V, EXTV
= 12V
= 40V
= 9V
= 12V, EXTV
= 40V, EXTV
= 12V, V
= 40V, V
110 C/W)
CC
in Regulation
= 0V
135 C/W)
80 C/W)
= 700mA
= 700mA
–
–
–
–
= 5V
= 5V, Sleep Mode
= 5V, V
= 5V, V
= 3.4V (Forced)
= 3.1V (Forced)
= 5.2V (Forced)
= 4.7V (Forced)
T
A
SHDN2
SHDN2
LOAD
LOAD
= 25 C, V
FB
FB
CC
CC
CC
= 700mA, V
= 700mA, V
= 1.32V (Forced)
= 1.15V (Forced)
= 2V
= 2V
= 5V, I
= 5V
= 5V
EXTV
See Typical Performance Characteristics and Applications Information.
Note 4: In applications where R
time increases approximately 40%.
Note 5: The LTC1159, LTC1159-3.3, and LTC1159-5 are not tested and
not quality assurance sampled at – 40 C and 85 C. These specifications
are guaranteed by design and/or correlation.
Note 6: The logic-level power MOSFETs shown in Figure 1 are rated for
V
MOSFETs with EXTV
Information.
LTC1159/LTC1159-3.3/LTC1159-5
CC
DS(MAX)
IN
SWITCH
= 0V, I
= 12V, V
CC
, the input current increases by (I
IN
IN
= 30V. For operation at V
= 10V
= 10V
CC
= 10mA
= 10mA
SHDN1
IN
CC
= 0V (Note 2), unless otherwise noted.
= 6V
powered from a 12V supply. See Applications
SENSE
IN
– 0.2
– 0.2
3.17
4.85
MIN
MIN
> 30V, use standard threshold
130
130
130
125
0.6
0.8
1.2
0.8
3.5
50
is placed at ground potential, the off-
4
GATECHG
1.25
3.30
5.05
TYP
TYP
250
150
150
150
100
200
300
250
150
0.8
1.4
4.5
1.4
25
25
25
12
70
15
25
25
0
0
2
5
5
Duty Cycle)/(Efficiency).
MAX
MAX
3.43
5.25
350
170
170
170
200
175
1.3
6.5
20
90
10
2
2
6
2
UNITS
UNITS
3
mV
mV
mV
mV
mV
mV
mV
mV
mV
ns
V
V
V
V
A
A
A
V
V
V
A
A
A
A
A
V
V
s
s