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D05022-152HC 데이터시트(PDF) 2 Page - Texas Instruments

부품명 D05022-152HC
상세설명  LM2727/LM2737 N-Channel FET Synchronous Buck Regulator Controller
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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D05022-152HC 데이터시트(HTML) 2 Page - Texas Instruments

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background image
HG
BOOT
ISEN
LG
PGND
FB
Vcc
SD
PWGD
FREQ
SS
SGND
EAO
PGND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LM2727, LM2737
SNVS205D – AUGUST 2002 – REVISED MARCH 2013
www.ti.com
Connection Diagram
Figure 1. 14-Lead Plastic TSSOP
θJA = 155°C/W
See Package Number PW0014A
PIN DESCRIPTION
BOOT (Pin 1) - Supply rail for the N-channel MOSFET gate drive. The voltage should be at least one gate threshold above the regulator
input voltage to properly turn on the high-side N-FET.
LG (Pin 2) - Gate drive for the low-side N-channel MOSFET. This signal is interlocked with HG to avoid shoot-through problems.
PGND (Pins 3, 13) - Ground for FET drive circuitry. It should be connected to system ground.
SGND (Pin 4) - Ground for signal level circuitry. It should be connected to system ground.
VCC (Pin 5) - Supply rail for the controller.
PWGD (Pin 6) - Power Good. This is an open drain output. The pin is pulled low when the chip is in UVP, OVP, or UVLO mode. During
normal operation, this pin is connected to VCC or other voltage source through a pull-up resistor.
ISEN (Pin 7) - Current limit threshold setting. This sources a fixed 50µA current. A resistor of appropriate value should be connected
between this pin and the drain of the low-side FET.
EAO (Pin 8) - Output of the error amplifier. The voltage level on this pin is compared with an internally generated ramp signal to determine
the duty cycle. This pin is necessary for compensating the control loop.
SS (Pin 9) - Soft start pin. A capacitor connected between this pin and ground sets the speed at which the output voltage ramps up. Larger
capacitor value results in slower output voltage ramp but also lower inrush current.
FB (Pin 10) - This is the inverting input of the error amplifier, which is used for sensing the output voltage and compensating the control
loop.
FREQ (Pin 11) - The switching frequency is set by connecting a resistor between this pin and ground.
SD (Pin 12) - IC Logic Shutdown. When this pin is pulled low the chip turns off the high side switch and turns on the low side switch. While
this pin is low, the IC will not start up. An internal 20µA pull-up connects this pin to VCC.
HG (Pin 14) - Gate drive for the high-side N-channel MOSFET. This signal is interlocked with LG to avoid shoot-through problems.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM2727 LM2737


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