AAT4901 Datasheet, PDF (14/16 Pages) Advanced Analogic Technologies – Buffered Power Full-Bridge

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PRODUCT DATASHEET
AAT4901
Buffered Power Full-Bridge
VBAT +
VBAT -
VBAT +
VBAT -
Lf
Field winding _Q1
Q2
La
Ia
VBAT +
Lf
Field winding _Q1
Q2
La
Ia
Q3
Q4
armature
Period (A)
Lf
Field winding _Q1
Q2
La
Ia
VBAT -
VBAT +
Q3
Q4
armature
Period (B)
Lf
Field winding _Q1
Q2
La
Ia
Q3
Q4
armature
Period (C)
VBAT +
Lf
Field winding _Q1
VBAT -
Q3
Q4
armature
Period (D)
Q2
La
Ia
VBAT -
Q3
Q4
armature
Period (E)
Figure 7: Full-Bridge Motor Drive Control.
Dual Channel, High Speed,
High Current 3-State Line Driver
The AAT4901-3 is ideally suited for dual channel, high
speed, high current 3-state line driver applications such
as CCD clock drivers. The low quiescent power dissipa-
tion makes this part attractive in battery powered prod-
ucts. The 3A peak drive capability also makes the
AAT4901-3 an excellent choice for driving high speed
capacitive lines. The 20ns fast switching/delay time
allows clocking speeds up to 10MHz.
Dual Low-Side MOSFET Driver
The AAT4901-3 is also ideally suited for dual low-side
MOSFET driver applications due to its dual independent
half-bridge output configuration. It can be used in a
push-pull topology as illustrated in Figure 9 or in other
applications which require the ability to drive the
MOSFETs quickly, due to the AAT4901's extremely low
R_DS(ON) (220/160mΩ typ.) and very fast propagation time
(20ns typ.)
14
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4901.2008.03.1.0