SC461 데이터 시트보기 (PDF) - Semtech Corporation
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SC461 Datasheet PDF : 31 Pages
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SC461
Electrical Characteristics (continued)
Parameter
High-Side Driver (DH, BST, LX)
Peak Current
On Resistance
Rise Time
Fall Time
Propagation Delay
Shoot-thru Protection Delay
Bootstrap Switch Resistance
Low-Side Driver (DL, VDDP, PGND)
Peak Current
On Resistance
Rise Time
Fall Time
Conditions
VDDP = 5V, DH pin sourcing or sinking
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
VDDP = 5V
VDDP = 5V
VDDP = 5V, DL sourcing
VDDP = 5V, DL sinking
RDL_PULL-UP, VDDP = 5V
RDL_PULL-DOWN, VDDP = 5V
CDL = 3nF, VDDP = 5V
CDL = 3nF, VDDP = 5V
Min Typ Max Units
2
A
3.6
5
Ω
1.1
2.1
Ω
0.65 1.20
Ω
22
ns
12
ns
45
ns
45
ns
16
Ω
2
A
4
A
0.85 1.60
Ω
0.28 0.50
Ω
7
ns
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. Note that
because the VIN UVLO threshold at the ENL pin is above the enable threshold of the LDO, the LDO must be used as bias power for the device
when using the VIN UVLO feature.
(2) For 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 VIN ULVO function of the ENL pin will disable the switcher unless the ENL pin exceeds
the VIN UVLO Threshold which is typically 1.55V.
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