SC508 데이터 시트보기 (PDF) - Semtech Corporation
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SC508 Datasheet PDF : 32 Pages
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SC508/SC508A
Electrical Characteristics (continued)
Parameter
Conditions
Min Typ Max Units
High-Side Driver (DH, BST, LX)
Peak Current
VDDP = 5V, DH pin sourcing or sinking
2
A
On Resistance
Rise Time
Fall Time
Propagation Delay
RDH_PULL-UP, LX < 0.5V, VDDP = 5V
RDH_PULL-UP, LX > 0.5V, VDDP = 5V
RDH_PULL-DOWN, VDDP = 5V
CDH-LX = 3nF, VDDP = 5V
CDH-LX = 3nF, VDDP = 5V
From FB Input to DH
3.0
6.0
Ω
1.0
2.0
Ω
0.6
1.2
Ω
22
ns
12
ns
45
ns
Shoot-thru Protection Delay
45
ns
Bootstrap Switch Resistance
16
Ω
Low-Side Driver (DL, VDDP, PGND)
Peak Current
VDDP = 5V, DL sourcing
VDDP = 5V, DL sinking
2
A
4
On Resistance
RDL_PULL-UP, VDDP = 5V
RDL_PULL-DOWN, VDDP = 5V
1.0
2.1
Ω
0.50 0.86
Ω
Rise Time
CDL = 3nF, VDDP = 5V
7
ns
Fall Time
CDL = 3nF, VDDP = 5V
3.5
ns
Notes:
(1) VIN UVLO is programmable using a resistor divider from VIN to ENL to AGND. The ENL voltage is compared to an internal reference.
(2) For UPSV and FCM operation, the VDDA and VDDA supply current includes the DH/DL current required to drive the external MOSFETS.
(3) The ENL pin will enable the LDO with 0.8V typical. The ENL pin VIN ULVO function will disable the switcher unless the ENL pin exceeds the VIN
UVLO Threshold which is typically 1.56V.
(4) The switch-over threshold is the maximum voltage differential between the VLDO and VOUT pins which ensures that VLDO will internally
switch-over to VOUT. The non-switch-over threshold is the minimum voltage differential between the VLDO and VOUT pins which ensures
that VLDO will not switch-over to VOUT.
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