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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: 23/44頁
文件大小: 983K
代理商: TPS2459RHBR
PRODUCTPREVIEW
ELECTRICAL CHARACTERISTICS
www.ti.com ............................................................................................................................................................................................ SLUS917 – FEBRUARY 2009
over –40°C
≤ TJ ≤ 85°C, VIN3 =VVDD3 = 3.3 V, VIN12 = VSENP = VSENM = VSETP = 12 V, VEN3=VEN12=logic 1 or open, VAGND =
VGNDA = VGNDB = 0 V, VSUM12 = 6.8 k to GND, , VSUM3 = 3.3 k to GND. All other pins OPEN, all I
2C bits at different values,
all voltages referenced to GND. (unless otherwise noted)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ENABLE INPUTS
Threshold voltage, falling edge
1.2
1.3
1.4
V
Hysteresis
20
50
80
mV
Pullup current
VEN =VOREN = 0 V
5
8
15
VEN12 =VOREN = 17 V
6
15
mA
Input bias current
VEN3 = 5 V
1
5
3.3-V Turn off time
EN3 deasserts to VVOUT3 < 1.0 V, COUT = 0 F
10
mS
EN12 deasserts to VVOUT12 < 1.0 V, COUT = 0 F, CQGATE
12-V Turn off time
20
= 35 nF
POWER GOOD COMPARATORS
PG12, falling OUT12
10.2
10.5
10.8
Threshold voltage
V
PG3, falling OUT3
2.7
2.8
2.9
PG12, measured at OUT12
130
Hysteresis
mV
PG3, measured at OUT3
50
INTERNAL 2.35-V RAIL
Output voltage
0 V < IVINT < 50 A
2.0
2.3
2.8
V
FAULT TIMER
Minimum fault time
3FT[4:0] = 12FT[4:0] = 00001B
1
ms
Fault time bit weight
0.5
Retry duty cycle
D = tFAULT/tDELAY
1.4%
1.5
1.6%
12-V SUMMING NODE
10.8 V
≤ VSENM ≤ 13.2 V, VSENP = (VSENM + 50 mV),
Input referred offset
–1.5
1.5
mV
measure VSET– VSENM
Summing threshold
12CL[3:0] = 1111B, VPASS = 15 V
0.66
0.675
0.69
V
Leakage current
VSET =(VSENM – 10 mV)
1
mA
12-V CURRENT LIMIT
RSUM = 6.8 k, RSET = 422 , increase ILOAD and
Current limit threshold
47.5
50
52.5
mV
measure VSENP – VSENM when VPASS = 15 V
Sink current in current limit
IPASS measured at VSUM = 1 V and VPASS = 12 V
20
40
mA
Fast trip threshold
Measure VSENP – VSENM
80
100
120
mV
Fast turn-off delay
20 mV overdrive, CPASS = 0 pF, tp50-50
200
300
ns
Bleed-down resistance
VOUT = 6 V
1.1
1.6
2.1
k
Bleed-down threshold
75
100
130
mV
VPASS - VIN when timer starts, while VPASS falling due to
Timer start threshold
5
6
7
V
overcurrent
Copyright 2009, Texas Instruments Incorporated
3
Product Folder Link(s): TPS2459
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