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LTC1148L Datasheet

  • LTC1148L

  • Linear Technology [High Efficiency Synchronous Step-Down Sw...

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LTC1148
LTC1148-3.3/LTC1148-5
TYPICAL PERFOR A CE CHARACTERISTICS
Gate Charge Supply Current
28
24
20
16
12
8
4
0
20
260
80
200
140
OPERATING FREQUENCY (kHz)
LTC1148 鈥?TPC07
GATE CHARGE CURRENT (mA)
SENSE VOLTAGE (mV)
OFF TIME (碌s)
Q
N
+ Q
P
= 100nC
Q
N
+ Q
P
= 50nC
PI FU CTIO S
P-DRIVE (Pin 1):
High Current Drive for Top P-Channel
MOSFET. Voltage swing at this pin is from V
IN
to ground.
NC (Pin 2):
No Connection. Can connect to power ground.
V
IN
(Pin 3):
Main Supply Pin. Must be closely decoupled
to power ground Pin 12.
C
T
(Pin 4):
External capacitor C
T
from Pin 4 to ground sets
the operating frequency. The actual frequency is also
dependent upon the input voltage.
INTV
CC
(Pin 5):
Internal Supply Voltage, Nominally 3.3V.
Can be decoupled to signal ground. Do not externally load
this pin.
I
TH
(Pin 6):
Gain Amplifier Decoupling Point. The current
comparator threshold increases with the Pin 6 voltage.
SENSE
鈥?/div>
(Pin 7):
Connects to internal resistive divider
which sets the output voltage in LTC1148-3.3 and
LTC1148-5 versions. Pin 7 is also the (鈥? input for the
current comparator.
SENSE
+
(Pin 8):
The (+) Input to the Current Comparator.
A built-in offset between Pins 7 and 8 in conjunction with
R
SENSE
sets the current trip threshold.
V
FB
(Pin 9):
For the LTC1148 adjustable version, Pin 9
serves as the feedback pin from an external resistive
divider used to set the output voltage. On LTC1148-3.3
and LTC1148-5 versions this pin is not used.
SHUTDOWN (Pin 10):
When grounded, the LTC1148
series operates normally. Pulling Pin 10 high holds both
MOSFETs off and puts the LTC1148 series in micropower
shutdown mode. Requires CMOS logic signal with t
R
,
t
F
< 1碌s, should not be left floating.
SGND (Pin 11):
Small-Signal Ground. Must be routed
separately from other grounds to the (鈥? terminal of C
OUT
.
PGND (Pin 12):
Driver Power Ground. Connects to source
of N-channel MOSFET and the (鈥? terminal of C
IN
.
NC (Pin 13):
No Connection. Can connect to power ground.
N-DRIVE (Pin 14):
High Current Drive for Bottom
N-Channel MOSFET. Voltage swing at Pin 14 is from
ground to V
IN
.
U W
Off Time vs V
OUT
80
70
60
50
40
30
20
10
LTC1148-3.3
0
0
1
2
3
4
5
LTC1148-5
V
SENSE 鈥?/div>
= V
OUT
Current Sense Threshold Voltage
175
150
125
100
75
50
25
0
0
20
60
40
TEMPERATURE (擄C)
80
100
MAXIMUM
THRESHOLD
MINIMUM
THRESHOLD
OUTPUT VOLTAGE (V)
LTC1148 鈥?TPC08
LTC1148 鈥?TPC09
U
U
U
5

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