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參數資料
| 型號： | TPS2459RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFP-32 |
| 文件頁數： | 44/44頁 |
| 文件大小： | 983K |
| 代理商： | TPS2459RHBR |
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PRODUCTPREVIEW
www.ti.com ............................................................................................................................................................................................ SLUS917 – FEBRUARY 2009
TERMINAL FUNCTIONS (continued)
PIN
NAME
I/O
DESCRIPTION
NO.
12-V blocking transistor enable. (active high). Pulling this pin high (or allowing it to float high) allows the 12-V
OREN
10
I
channel ORing function to operate normally. Pulling this pin low disables the 12-V ORing function by pulling
the BLK pin low. An internal 200-k
resistor pulls this pin up to VINT when disconnected.
OUT12
8
I/O
12-V output. Senses the output voltage of the 12-V channel.
OUT3
17
I/O
3-V output. Output of the 3-V channel internal pass FET.
12-V pass transistor gate drive. This pin sources 30
A to turn the FET on. An internal clamp prevents this pin
PASS
12
O
from rising more than 14.5 V above IN12.
12-V power good output,asserts when VOUT12 > VPG12 ( active low) . Open-drain output indicating that channel
PG12
4
O
12 output voltage has dropped below the PG threshold, which nominally equals 10.5 V.
3-V power good output, asserts when VOUT3 > 2.8 V ( active low) . Open-drain output indicating that channel 3
PG3
20
O
output voltage has dropped below the PG threshold, which nominally equals 2.85 V.
SCL
3
I
Serial clock input for the I2C data line. (See TPS2459 I2C Interface section for details.
SDA
2
I/O
Bidirectional I2C data line. (See TPS2459 I2C Interface section for details.
SENM
12
I
12-V current limit sense. Senses the voltage on the low side of the 12-V channel current sense resistor.
SENP
14
I
12-V input sense. Senses the voltage on the high side of the 12-V channel current sense resistor.
12-V current limit set. A resistor connected from this pin to SENP sets the current limit level in conjunction with
SET
13
I
the current sense resistor and the resistor connected to the SUM12 pin, as described in 12-V thresholds,
setting current limit and fast overcurrent trip section.
12-V summing node. A resistor connected from this pin to ground forms part of the channel x current limit. As
SUM12
5
I/O
the current delivered to the load increases, so does the voltage on this pin. When the voltage on this pin
reaches 675 mV, the current limit amplifier acts to prevent the current from further increasing.
3-V summing node. A resistor connected from this pin to ground forms part of the channel x current limit. As
SUM3
21
I/O
the current delivered to the load increases, so does the voltage on this pin. When the voltage on this pin
reaches 675 mV, the current limit amplifier acts to prevent the current from further increasing.
VDD3
22
I
3-V charge pump input
Bypass capacitor connection point for internal supply. This pin connects to the internal 2.35-V rail. A 0.1-
F
VINT
1
I/O
capacitor must be connected from this pin to ground. Do not connect other external circuitry to this pin
except the address programming pins, as required.
Copyright 2009, Texas Instruments Incorporated
9
Product Folder Link(s): TPS2459
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