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參數資料
| 型號： | TPS54974PWPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 16 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數： | 17/21頁 |
| 文件大小： | 743K |
| 代理商： | TPS54974PWPR |
www.ti.com
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AGND
VSENSE
COMP
PWRGD
BOOT
PH
RT
VIN
SS/ENA
VBIAS
PVIN
PGND
PWP PACKAGE
(TOP VIEW)
THERMAL
PAD
TPS54974
SLVS458B – JANUARY 2003 – REVISED FEBRUARY 2005
Terminal Functions
TERMINAL
DESCRIPTION
NAME
NO.
AGND
1
Analog ground. Return for compensation network/output divider, slow-start capacitor, VBIAS capacitor, and RT
resistor. Connect PowerPAD to AGND.
BOOT
5
Bootstrap output. 0.022-F to 0.1-F low-ESR capacitor connected from BOOT to PH generates floating drive for the
high-side FET driver.
COMP
3
Error amplifier output. Connect frequency compensation network from COMP to VSENSE
PGND
15-19
Power ground. High current return for the low-side driver and power MOSFET. Connect PGND with large copper
areas to the input and output supply returns, and negative terminals of the input and output capacitors. A single-point
connection to AGND is recommended.
PH
6-14
Phase output. Junction of the internal high-side and low-side power MOSFETs, and output inductor.
PVIN
20-24
Input supply for the power MOSFET switches and internal bias regulator. Bypass VIN pins to PGND pins close to
device package with a high-quality, low-ESR 10-F ceramic capacitor.
PWRGD
4
Power-good, open-drain output. High when VSENSE
≥ 90% V
ref, otherwise PWRGD is low. Note that output is low
when SS/ENA is low or the internal shutdown signal is active.
RT
28
Frequency setting resistor input. Connect a resistor from RT to AGND to set the switching frequency, fs.
SS/ENA
26
Slow-start/enable input/output. Dual function pin which provides logic input to enable/disable device operation and
capacitor input to externally set the start-up time.
VBIAS
25
Internal bias regulator output. Supplies regulated voltage to internal circuitry. Bypass VBIAS pin to AGND pin with a
high-quality, low-ESR 0.1-F to 1.0-F ceramic capacitor.
VIN
27
Input supply for the internal bias regulator. An external capacitor of 1 F to be connected to the VIN pin.
VSENSE
2
Error amplifier inverting input. Connect to output voltage compensation network/output divider.
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