參數(shù)資料
型號: LTC1265-3.3
廠商: Linear Technology Corporation
英文描述: 1.2A, High Efficiency Step-Down Current Mode DC/DC Converter(3.3V,12A,高效率,電流模式步降DC/DC變換器)
中文描述: 1.2A的,高效率降壓型電流模式DC / DC轉(zhuǎn)換器(3.3V,12A條,高效率,電流模式步降直流/直流變換器)
文件頁數(shù): 4/16頁
文件大?。?/td> 233K
代理商: LTC1265-3.3
4
LTC1265/LTC1265-3.3/LTC1265-5
PWR V
IN
(Pins 1, 13):
Supply for the Power MOSFET and
its Driver. Must decouple this pin properly to ground. Must
always tie Pins 1 and 13 together.
V
IN
(Pin 2):
Main Supply for All the Control Circuitry in the
LTC1265.
LB
OUT
(Pin 3):
Open-Drain Output of the Low-Battery
Comparator. This pin will sink current when Pin 4 (LB
IN
)
goes below 1.25V. During shutdown, this pin is high
impedance.
LB
IN
(Pin 4):
The (–) Input of the Low-Battery Comparator.
The (+) input is connected to a reference voltage of 1.25V.
C
T
(Pin 5):
External capacitor C
T
from Pin 5 to ground sets
the switch off time. The operating frequency is dependent
on the input voltage and C
T
.
I
TH
(Pin 6):
Feedback Amplifier Decoupling Point. The
current comparator threshold is proportional to Pin 6
voltage.
SENSE
(Pin 7):
Connect to the (–) input of the current
comparator. For LTC1265-3.3 and LTC1265-5, it also
connects to an internal resistive divider which sets the
output voltage.
SENSE
+
(Pin 8):
The (+) Pin to the Current Comparator. A
built-in offset between Pins 7 and 8 in conjunction with
R
SENSE
sets the current trip threshold.
N/C,V
FB
(Pin 9):
For the LTC1265 adjustable version, this
pin serves as the feedback pin from an external resistive
divider used to set the output voltage. On the LTC1265-3.3
and LTC1265-5 versions, this pin is not used.
SHDN (Pin 10):
Pulling this pin HIGH keeps the internal
switch off and puts the LTC1265 in micropower shut-
down. Do not float this pin.
SGND (Pin 11):
Small-Signal Ground. Must be routed
separately from other grounds to the (–) terminal of C
OUT
.
PGND (Pin 12):
Switch Driver Ground. Connects to the
(–) terminal of C
IN
. Anode of the Schottky diode must be
connected close to this pin.
SW (Pin 14):
Drain of the P-Channel MOSFET Switch.
Cathode of the Schottky diode must be connected close to
this pin.
DC Supply Current
Supply Current in Shutdown
Gate Charge Losses
INPUT VOLTAGE (V)
0
0
S
0.3
0.6
0.9
2.1
1.5
2
6
8
14
1.8
1.2
4
10
12
DOES NOT INCLUDE
GATE CHARGE
ACTIVE MODE
SLEEP MODE
1265 G07
INPUT VOLTAGE (V)
3
S
μ
A
6
8
11
1265 G08
4
2
0
5
7
9
13
5
7
3
1
10
4
6
8
12
SHUTDOWN = 3V
T
A
= 25C
FREQUENCY (kHz)
0
0
S
1.0
2.0
1.5
3.0
4.0
200
400
1265 G09
600
5.0
4.5
5.5
3.5
2.5
0.5
800
1000
V
IN
= 12V
V
IN
= 9V
V
IN
= 6V
TYPICAL PERFOR U
PIU
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