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参数资料
| 型号： | TPS2458RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | PLASTIC, QFP-32 |
| 文件页数： | 26/28页 |
| 文件大小： | 966K |
| 代理商： | TPS2458RHBR |
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DEVICE INFORMATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
O
U
T
1
2
G
N
D
O
R
E
M
P
A
S
E
N
M
S
E
T
G
N
D
N
C
G
N
D
E
N
1
2
G
N
D
E
N
3
G
N
D
VINT
GND
PG12
SUM12
FLT12
CT12
BLK
PowerPAD
TM
S
E
N
P
IN
1
2
N
C
TPS2458
(Top View)
24
23
22
21
20
19
18
17
25
AGND
VDD3
SUM3
PG3
FLT3
CT3
OUT3
IN3
3-V
Inputs
12-V Inputs
12-V
Inputs
www.ti.com ............................................................................................................................................................................................ SLUS916 – FEBRUARY 2009
Figure 1.
TERMINAL FUNCTIONS
NAME
NO.
I/O
Analog ground. Ground pin for the analog circuitry insideBypass capacitor connection point for internal supply
AGND
24
—
the TPS2458.
12-V blocking transistor gate drive. Gate drive pin for the 12-V channel BLK FET. This pin sources 30
A to
BLK
8
O
turn the FET on. An internal clam prevents this pin from rising more than 14.5 V above OUT12. Setting the
OREN pin high holds the BLK pin low.
12-V fault timing capacitor. A capacitor from CT12 to GND sets the time the channel can remain in current
limit before it shuts down and declares a fault. Current limit causes this pin to source 10
A into the external
CT12
7
I/O
capacitor (CT ). When VCT12 reaches 1.35 V, the TPS2458 shuts the channel off by pulling the FET gate low
and declares an overcurrent fault by pulling the FLT12 pin low
3-V fault timing capacitor. A capacitor from CT3 to GND sets the time the channel can remain in current limit
before it shuts down and declares a fault. Current limit causes this pin to source 10
A into the external
CT3
19
I/O
capacitor (CT ). When VCT3 reaches 1.35 V, the TPS2458 shuts the channel off by pulling the FET gate low
and declares an overcurrent fault by pulling the FLT3 pin low.
12-V enable. (active low). Pulling this pin high (or allowing it to float high) turns off the 12-V channel by pulling
EN12
28
I
both BLK and PASS low. An internal 200-k
resistor pulls this pin up to VINT when disconnected.
3-V enable. (active low) Pulling this pin high (or allowing it to float high) turns off the 3-V channel by pulling the
EN3
26
I
gate of the internal pass FET to GND. An internal 200-k
resistor pulls this pin up to VINT when
disconnected.
12-V fault output (active low) Open-drain output indicating that channel 12 has remained in current limit long
FLT12
6
O
enough to time out the fault timer and shut the channel down. asserted when 12-V fault timer runs out
3-V fault output (active low) Open-drain output indicating that channel 3 has remained in current limit long
FLT3
20
O
enough to time out the fault timer and shut the channel down. asserted when 3-V fault timer runs out
Copyright 2009, Texas Instruments Incorporated
7
Product Folder Link(s): TPS2458
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