Datasheet > LTC1265-3.3

LTC1265-3.3

更新时间： 2022-11-27 02:41:25

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
16页	230K
描述
1.2A, High Efficiency Step-Down DC/DC Converter

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LTC1265-3.3 数据手册

LTC1265/LTC1265-3.3/LTC1265-5

TYPICAL PERFORMANCE CHARACTERISTICS

DC Supply Current

Supply Current in Shutdown

Gate Charge Losses

2.1

1.8

1.5

1.2

0.9

0.6

0.3

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

DOES NOT INCLUDE

GATE CHARGE

SHUTDOWN = 3V

= 25C

= 12V

ACTIVE MODE

= 9V

= 6V

SLEEP MODE

200

400

600

800

1000

10 11 12 13

FREQUENCY (kHz)

INPUT VOLTAGE (V)

1265 G07

1265 G09

1265 G08

PIN FUNCTIONS

PWR V_IN(Pins 1, 13): Supply for the Power MOSFET and

itsDriver.Mustdecouplethispinproperlytoground.Must

always tie Pins 1 and 13 together.

SENSE⁺(Pin 8): The (+) Pin to the Current Comparator. A

built-in offset between Pins 7 and 8 in conjunction with

R_SENSEsets the current trip threshold.

V_IN(Pin 2): Main Supply for All the Control Circuitry in the

N/C,V_FB(Pin 9): For the LTC1265 adjustable version, this

pin serves as the feedback pin from an external resistive

dividerusedtosettheoutputvoltage. OntheLTC1265-3.3

and LTC1265-5 versions, this pin is not used.

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.

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.

LB_IN(Pin4):The(–)InputoftheLow-BatteryComparator.

The (+) input is connected to a reference voltage of 1.25V.

SGND (Pin 11): Small-Signal Ground. Must be routed

separately from other grounds to the (–) terminal of C_OUT

C_T(Pin 5): External capacitor C_Tfrom Pin 5 to ground sets

the switch off time. The operating frequency is dependent

on the input voltage and C_T.

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.

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.

SW (Pin 14): Drain of the P-Channel MOSFET Switch.

Cathode of the Schottky diode must be connected close to

this pin.

1 2 345 6 7...16

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