参数资料
型号: LTC1265CS-5#PBF
厂商: Linear Technology
文件页数: 4/16页
文件大小: 0K
描述: IC REG BUCK 5V 1.2A 14SOIC
标准包装: 55
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 3.5 V ~ 12 V
PWM 型: 电流模式,混合
频率 - 开关: 最高 700kHz
电流 - 输出: 1.2A
同步整流器:
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 14-SOIC(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 14-SOIC
LTC1265/LTC1265-3.3/LTC1265-5
TYPICAL PERFOR A CE CHARACTERISTICS
DC Supply Current
Supply Current in Shutdown
Gate Charge Losses
2.1
1.8
1.5
1.2
DOES NOT INCLUDE
GATE CHARGE
ACTIVE MODE
8
7
6
5
SHUTDOWN = 3V
T A = 25C
5.5
5.0
4.5
4.0
3.5
3.0
V IN = 12V
V IN = 9V
0.9
4
2.5
3
2.0
V IN = 6V
0.6
2
1.5
0.3
SLEEP MODE
1
1.0
0.5
0
0
2
4
6
8
10
12
14
0
3
4
5
6
7
8
9
10 11 12 13
0
0
200
400
600
800
1000
INPUT VOLTAGE (V)
PI FU CTIO S
1265 G07
INPUT VOLTAGE (V)
1265 G08
FREQUENCY (kHz)
1265 G09
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.
4
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.
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