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LM2647LQ 데이터시트(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM2647LQ
상세설명  Dual Synchronous Buck Regulator Controller
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2647LQ 데이터시트(HTML) 6 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
Specifications with standard typeface are for T
J = 25˚C, and those with boldface apply over full Operating Junction Tempera-
ture range. VDD = V5 = 5V, V
SGND =VPGND = 0V, VIN = 15V, VEN = 3V, RFADJ = 22.1K unless otherwise stated. (Note 5)
Symbol
Parameter
Conditions
Min
(Note 6)
Typical
(Note 7)
Max
(Note 6)
Units
Power Good
V
PGOOD_HI
Power Good Upper Threshold
as a Percentage of Internal
Reference
FB voltage rising above V
FB_REG
110
113
116
%
V
PGOOD_LOW
Power Good Lower Threshold
as a Percentage of Internal
Reference
FB voltage falling below V
FB_REG
84
87
90
%
Power Good Hysteresis
7
%
∆t
PG_OK
Power Good Delay
From both output voltages “good”
to PGOOD assertion.
10
20
30
µs
∆t
PG_NOK
From the first output voltage “bad”
to PGOOD de-assertion
4
7
10
∆t
SD
From Enable low to PGOOD low
0.03
0.1
PGOOD Saturation Voltage
PGOOD de-asserted (Power Not
Good) and sinking 1.5mA
0.12
0.4
V
PGOOD Leakage Current
PGOOD = 5V and asserted
0
1
µA
OV and UV Protection
Fault OVP Latch Threshold
as a Percentage of Internal
Reference
FB voltage rising above V
FB_REG
125
130
135
%
Fault UVP Latch Threshold
as a Percentage of Internal
Reference
FB voltage falling below V
FB_REG
65
70
75
%
∆t
FAULT
Fault Delay
From Fault detection (any output)
to Fault assertion
7µs
Soft-start
I
SS_CHG
Soft-start Charging Current
V
SS =1V
8
11
14
µA
R
SS_DCHG
Soft-shutdown Resistance
(SS pin to SGND, either
channel)
V
EN = 0V, VSS = 1V
1800
I
SS_DCHG
Soft-start Discharge Current
In Current Limit
80
115
160
µA
V
SS_RESET
Soft-start pin reset voltage
(Note 8)
SS charged to 0.5V, EN low to high
100
mV
SS to COMP Offset Voltage
V
SS = 0.5V and 1V, VFB1 =VFB2 =
0V
600
mV
Error Amplifier
GAIN
DC Gain
70
dB
Voltage Slew Rate
COMP rising
4.45
V/µs
COMP falling
2.25
BW
Unity Gain Bandwidth
COMP falling
6.5
MHz
COMP Source Current
V
FB < VFB_REG
V
COMP = 0.5V
2
5mA
COMP Sink Current
V
FB > VFB_REG
V
COMP = 0.5V
7
14
mA
Current Limit and Zero-Cross
I
ILIM
I
LIM Pin Current (sourcing,
either ILIM pin)
V
ILIM1 =VILIM2 =0V
46
62
76
µA
I
ILIM Threshold Voltage
-10
0
10
mV
www.national.com
6


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