Analogic AAT4901IJS-1-T1 Buffered power full-bridge Datasheet

PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
General Description
Features
The AAT4901 FastSwitch™ is a member of AnalogicTech’s
Application Specific Power MOSFET™ (ASPM™) product
family. It is a full-bridge buffered power stage operating
with an input voltage range of 2.0V to 5.5V. The device
is designed to operate with a switching frequency of up
to 2MHz, minimizing the cost and size of external components. The AAT4901 is protected from shoot-through
current by integrated break-before-make circuitry. The
drivers can be independently controlled and their propagation delay, from input to output, is typically between
8ns-19ns dependent upon logic option.
• VIN Range: 2.0V–5.5V
• RDS(ON):
High-side 220mΩ
Low-side 160mΩ
• Break-Before-Make Shoot–Through Protection
• 4 Options
Single Control Input with Enable
• Two Logic Versions
Dual Control Input with Brake Function
Dual Half-bridge
• Low Quiescent Current:
10µA (max) DC
4mA (max) at 1MHz
• -40°C to +85°C Temperature Range
• SC70JW-8 Package
Four options are offered providing a single input control,
dual input control or as two independent half-bridges.
Other features include low RDS(ON) and low quiescent current allowing for high efficiency performance.
Applications
The AAT4901 is available in the space-saving, Pb-free
8-pin SC70JW package and is rated over the -40°C to
+85°C temperature range.
DC Motor Drive
Door Locks
Dual Low-Side MOSFET Gate Driver
Fan Motors
High Frequency DC/DC Converters
High Speed Line Drive
Proximity Detectors
Typical Applications
IN
CIN
OUTA
AAT4901-1
ENA
OUTB
ENB
GND
4901.2008.03.1.0
www.analogictech.com
1
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Pin Descriptions
Symbol
Pin #
-1, -2, -4
1
2
3
4
ENA
IN
ENB
N/C
5
6
7
8
Function
-3
Active high enable signal.
Supply voltage input; input voltage range from 2.0V to 5.5V.
Active high enable signal.
4901-1/-2/-4: No connection.
4901-3: Active high enable signal.
Ground connection
Output of half-bridge B. Connect to load.
Output of half-bridge A. Connect to load.
4901-1/-2/-4: No connection.
4901-3: Active high enable signal.
ENC
GND
OUTB
OUTA
N/C
END
Pin Configuration
SC70JW-8
(Top View)
ENA
IN
ENB
N/C
1
8
2
7
3
6
4
5
N/C
OUTA
OUTB
GND
ENA
IN
ENB
ENC
AAT4901-1/-2/-4
2
1
8
2
7
3
6
4
5
END
OUTA
OUTB
GND
AAT4901-3
www.analogictech.com
4901.2008.03.1.0
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Absolute Maximum Ratings1
Symbol
VIN
VEN
VOUT
IMAX
IMAX(PK)
TLEAD
Description
IN to GND
ENA, ENB, ENC, END to GND
OUT to GND
Maximum Continuous Switch Current
Maximum Peak Current
Maximum Soldering Temperature (at Leads)
Value
Units
-0.3 to 6.0
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
0.7
3
300
V
V
V
A
A
°C
Value
Units
440
225
-40 to 150
mW
°C/W
°C
Thermal Information
Symbol
PD
ΘJA
TJ
Description
Maximum Power Dissipation (TA = 25°C)
Thermal Resistance2
Operating Junction Temperature Range
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on a FR4 board.
4901.2008.03.1.0
www.analogictech.com
3
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Electrical Characteristics1
VIN = 5V, TA = -40 to 85°C unless otherwise noted. Typical values are at TA=25°C.
Symbol
VIN
Description
Conditions
IQAC
AC Quiescent Current
IQDC
DC Quiescent Current
IQ(OFF)
Off-Supply Current
ISD(OFF)
Off-Switch Current
RDS(ON)H
High Side MOSFET On-Resistance
RDS(ON)L
Low Side MOSFET On-Resistance
VONL
VONH
VHYS
ISINK
ENA
ENA
ENA
ENA
TBBM
Break-Before-Make Time
(C), ENB (D) Input Low Voltage
(C), ENB (D) Input High Voltage
(C), ENB (D) Input Hysteresis
(C), ENB (D) Input Leakage
AAT4901-1
AAT4901-2
IN = 5V, ENB (D) = IN,
ENA = 1MHz, IOUT = 0
AAT4901-3
AAT4901-4
AAT4901-1
AAT4901-2
IN = 5V, ENB (D) = IN,
ENA (C) = GND, IOUT = 0
AAT4901-3
AAT4901-4
ENB (D) = ENA (C) = GND, IN = OUT
= 5.5V
ENB (D) = GND, IN = 5.5V, VOUT = 0, or
OUT = IN
VIN= 4.5V
VIN= 3.0V
VIN= 2.0V
VIN= 4.5V
VIN= 3.0V
VIN= 2.0V
Max
Units
5.5
V
3.8
2.0
0.72
0.9
4.0
mA
5.5
10.0
µA
1.0
µA
1
µA
0.03
220
250
340
160
180
240
mΩ
mΩ
0.2 · VIN
0.5 · VIN
ENA (C) , ENB (D) = 5.5V
ENA (C) Rising
ENA (C) Falling
ENA (C) to OUT Delay
ENA (C) Falling
ENA (C) = GND
THIZ
Typ
2.0
ENA (C) Rising
TON-DLY
Min
Operation Voltage
ENB to OUT HiZ Delay
ENA (C) = IN
AAT4901-1
AAT4901-2
AAT4901-3
AAT4901-4
AAT4901-1
AAT4901-2
AAT4901-3
AAT4901-4
AAT4901-1
AAT4901-2
AAT4901-3
AAT4901-4
AAT4901-1
AAT4901-2
AAT4901-3
AAT4901-4
0.15 · VIN
0.01
5.0
5.0
15
15
8
14
18
15
7
19
12
10
10
12
11
10
7
12
1.0
V
V
V
µA
ns
ns
ns
ns
ns
ns
1. The AAT4901 is guaranteed to meet performance specifications over the –40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls.
4
www.analogictech.com
4901.2008.03.1.0
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
AC Quiescent Current vs. Input Voltage
AC Quiescent Current vs. Input Voltage
(ENB = IN; ENA = 1MHz; IOUT = 0; TA = 25°C)
(ENA = ENB = 1MHz; IOUT = 0; TA = 25°C)
1.5
AC Quiescent Current (mA)
AC Quiescent Current (mA)
Typical Characteristics
1.2
0.9
0.6
0.3
0
2
2.5
3
3.5
4
4.5
5
4
3.5
3
2.5
2
1.5
1
2
5.5
2.5
3
Input Voltage (V)
3.5
4
4.5
5
5.5
Input Voltage (V)
AC Quiescent Current vs. Switching Frequency
(ENB = IN; ENA = 0.1kHz~2000kHz; IOUT = 0, TA = 25°C)
(ENA = ENB = 0.1kHz~2000kHz; IOUT = 0, TA = 25°C)
10
AC Quiescent Current (mA)
AC Quiescent Current (mA)
AC Quiescent Current vs. Switching Frequency
1
0.1
0.01
VIN = 5.0V
VIN = 3.0V
0.001
0.1
1
10
100
1000
10
1
0.1
0.01
VIN = 5.0V
VIN = 3.0V
0.001
10000
0.1
1
Switching Frequency (kHz)
AC Quiescent Current vs. Temperature
DC Quiescent Current (µA)
AC Quiescent Current (mA)
3
2
1
VIN = 5.0V
VIN = 3.0V
10
35
10000
60
85
8
7
6
5
4
3
2
VIN = 5.0V
VIN = 3.0V
1
0
-40
Temperature (°C)
4901.2008.03.1.0
1000
(ENB = IN; ENA = GND; IOUT = 0)
4
-15
100
DC Quiescent Current vs. Temperature
(ENA = ENB = 1MHz; IOUT = 0)
0
-40
10
Switching Frequency (kHz)
-15
10
35
60
85
Temperature (°C)
www.analogictech.com
5
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Typical Characteristics
Low Side RDS(ON) vs. Output Current
High Side RDS(ON) vs. Output Current
(TA = 25°C)
300
350
250
300
RDS(ON)H (mΩ)
RDS(ON)L (mΩ)
(TA = 25°C)
200
150
100
VIN = 2.0V
VIN = 3.0V
VIN = 4.5V
50
0
0.1
0.2
0.3
0.4
0.5
0.6
250
200
150
100
VIN = 2.0V
VIN = 3.0V
VIN = 4.5V
50
0
0.1
0.7
0.2
0.3
Output Current (A)
Low Side RDS(ON) vs. Temperature
300
350
250
RDS(ON)H (mΩ)
RDS(ON)L (mΩ)
400
200
150
100
VIN = 2.0V
VIN = 3.0V
VIN = 4.5V
50
10
35
60
250
200
150
VIN = 2.0V
VIN = 3.0V
VIN = 4.5V
100
50
0
-40
85
-15
10
35
60
85
Temperature (°C)
MOSFETs RDS(ON) vs. Input Voltage
ENA/ENB Threshold vs. Input Voltage
(IOUT = 0.7A; TA = 25°C)
(TA = 25°C)
2.4
ENA/ENB Threshold (V)
350
300
RDS(ON) (mΩ)
0.7
300
Temperature (°C)
250
200
150
100
High Side
Low Side
50
2
1.6
1.2
0.8
VON_H
VON_L
0.4
0
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
6
0.6
(IOUT = 0.7A)
350
-15
0.5
High Side RDS(ON) vs. Temperature
(IOUT = 0.7A)
0
-40
0.4
Output Current (A)
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
www.analogictech.com
4901.2008.03.1.0
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Functional Block Diagram
IN
OUTA
OUTB
ENA
ENC
Control Logic
ENB
END
AAT4901-3 Only
GND
Functional Description
The AAT4901 is a buffered full-bridge driver IC with
options to allow the device to function as two independent
half-bridges. The output stage is capable of driving output
loads of up to 0.7A and features break-before-make timing and very fast propagation delay time, allowing high
4901.2008.03.1.0
switching speed up to 2MHz. The enable input (EN), when
driven low, turns off the driver and reduces the operating
current to less than 1μA. Logic options allow the AAT4901
to be used as a small DC motor driver with break function,
a solenoid driver, a dual-low-side MOSFET driver, or as a
coil driver. Applications include motor drive, proximity
detectors, electronic locks, and DC-DC converters.
www.analogictech.com
7
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Options
AAT4901-1/-4 Logic Table
AAT4901-1
-1
H-bridge configuration with two enables. Enable B is
active high and enables the H-bridge output. Enable A
toggles the H-bridge outputs A and B in anti-phase. In
steady state, this can provide forward/reverse motor
drive signals.
AAT4901-2
H-bridge configuration with two enables. Enable A and
Enable B are in anti-phase and provide forward/reverse
and braking.
ENA
ENB
ENA
ENB
OUTA
OUTB
0
1
0
1
0
0
1
1
0
1
1
0
0
1
0
1
Hi Z
Hi Z
IN
GND
Hi Z
Hi Z
GND
IN
AAT4901-2 Logic Table
ENA
ENB
OUTA
OUTB
0
1
0
1
0
0
1
1
Hi Z
IN
GND
IN
Hi Z
GND
IN
IN
AAT4901-3
Dual independent half-bridge configuration with four
enables. Function similar to 2 x AAT4900.
AAT4901-4
-4
AAT4901-3 Logic Table
H-bridge with two enables. Enable A and Enable B are in
anti-phase and toggle the H-bridge outputs A and B in
anti-phase respectively. In steady state, this can provide
forward/reverse motor drive signals to adjust the motor
speed by various duty cycles.
ENA/C
ENB/D
OUTA/B
0
1
0
1
0
0
1
1
Hi Z
Hi Z
IN
GND
Timing Diagram
TON-DLY-F
V_ENA
50%
50%
50%
50%
T ON-DLY-R
90%
(OFF)
(OFF)
Hi Z
Hi Z
V_OUTA
10%
TON-DLY-R
V_ENB
TON-DLY-F
50%
50%
50%
50%
90%
(OFF)
(OFF)
Hi Z
Hi Z
V_OUTB
10%
TON-DLY-F
TON-DLY-R
THIZ_GND
THIZ_IN
Figure 1: AAT4901-4 Timing Diagram.
8
www.analogictech.com
4901.2008.03.1.0
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Application Information
Where:
Input Supply Capacitor
The input capacitor provides a low impedance loop for
the edges of pulsed current drawn by the AAT4901 and
reduces the surge current drawn from the input power.
A 4.7μF to 10μF X7R or X5R low ESR/ESL ceramic capacitor is selected for the input supply decoupling. To minimize the tray resistance, the capacitor should be placed
as closely as possible to the input pin. This keeps the
high frequency content of input current localized, minimizing EMI and input voltage ripple.
Shoot-Through Protection
The internal high-side and low-side MOSFETs of the
AAT4901 cannot conduct at the same time to prevent
shoot-through current. When the high-side MOSFET
turns on, the low-side MOSFET turns off first; after 5ns
break-before-make time, the high-side MOSFET then
turns on. Similarly, before the low-side MOSFET turns
on, the high-side MOSFET turns off; after a certain
break-before-make time (5ns typ.), the low-side MOSFET
turns on. The dead time between the high-side and lowside turn-on should be kept as low as possible to minimize current flows through the body diode of the highside and/or low-side MOSFET(s). The break-before-make
shoot-through protection significantly reduces losses
associated with the driver at high frequency.
Thermal Calculations
TJ(MAX) - TA
θJA
= IQAC · VCC + QG(tot)FSW · VCC
4901.2008.03.1.0
The maximum junction temperature for the SC70JW-8
package can be derived from Equation 1:
Eq. 2: TJ(MAX) = PD(MAX) · θJA + TA
For example, if the AAT4901 drives 2 AAT9560 MOSFETs
whose maximum gate charge is specified as 13nC for
VGATE = 5V, the total power dissipation in the driver at a
switching frequency of 1MHz equals:
PD(tot) = 2 · (5V · 13nC · 1MHz) + 5V · 4.0mA = 150mW
Gate Drive Current Ratings
Assuming that the maximum gate charge of the dual
low-side MOSFETs are equal, the maximum gate drive
capability for the designed maximum junction temperature without an external resistor can be derived from
Equation 1:
Eq. 3: QG(MAX) =
In the dual low-side MOSFET driver application, the
power dissipation of the AAT4901 includes the power
dissipation in the MOSFETs due to charging and discharging the gate capacitance, the AC quiescent current
power dissipation, and transient power in the driver during output transitions. As the transient power is usually
very small, its losses can be ignored. Maximum package
power dissipation can be estimated by the following
equation:
Eq. 1: PD(MAX) = VCC · IIN =
TJ(MAX) = junction temperature of the dice (°C).
TA = ambient temperature (°C).
θJA = thermal resistance (225°C/W).
IQAC = AC quiescent current of the driver (mA).
QG(tot) = total gate charge of external low side MOSFETs
(nC).
FSW = switching frequency (MHz).
1
·
2 · FSW
TJ(MAX) - TA
- IQAC
θJA · VIN
The relationship between gate capacitance, turn-on/
turn-off time, and the MOSFET driver current rating can
be determined by:
Eq. 4: IG(MAX) = CG(MAX) ·
dV
dt
Where:
IG(MAX) = peak drive current for a given voltage
CG(MAX) = maximum gate capacitance
dV = MOSFET gate-to-source voltage
dt = rising time of MOSFET gate-to-source voltage
www.analogictech.com
9
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
The relationship between CG(MAX) , QG(MAX) , and VGATE is
given by:
Eq. 5: CG(MAX) =
2-Phase Synchronous Buck Converter
QG(MAX)
VGATE
The peak current drive requirements for a given MOSFET
gate voltage can be derived from Equations 4 and 5:
Eq. 6: IG(MAX) =
VIN = 5V
VGATE = 5V
FSW = 1MHz
θJA = 225°C/W
IQAC = 4.0mA
TJ(MAX) = 120°C
TA = 85°C
tRISE = dt = 10ns
10
1
⎛ 120°C - 85°C
⎞
·
- 4.0mA = 13.6nC
⎠
2 · 1MHz ⎝ 225°C/W · 5V
CG(MAX) =
QG(MAX) 13.6nC
=
= 2.7nF
VGATE
5V
IG(MAX) =
QG(MAX) 13.6nC
=
= 1.36A
dt
10ns
The most common AAT4901 applications include multiphase DC/DC converter output power stages, DC motor
drive, a dual low-side MOSFET driver, and a 3-state highspeed high-current line driver.
Figure 2 shows a typical configuration when used as a
2-phase buck converter power stage with synchronous
rectification. The EN pin can be used to force outputs
OUTA/OUTB to a high impedance state; this allows the
output inductor to operate in discontinuous condition
mode (DCM) and improves efficiency under light load
conditions. The body diode associated with the low-side
switching device gives the AAT4901 inductive switching
capability, and clamps the LX node at one diode drop
below GND during the break-before-make time. The
multiphase buck converter assures a stable, high-performance topology for high currents and low voltages which
are demanded in computers, workstation, telecom and
datacom servers. Figure 3 illustrates output ripple current reduction due to 2-phase cancellation.
QG(MAX)
dt
Design Example
QG(MAX) =
Typical Applications
Motor Drive
The AAT4901 is ideally suited for use as an efficient output driver for DC brushless motor control due to its full
bridge output stage with integrated MOSFETs. The inductive load switching capability of the AAT4901 eliminates
the need for external diodes during commutation time.
In applications where rotation is always in the same
direction, a single half-bridge AAT4900 can be used to
drive a DC motor. If needed to control the rotation in
both directions, full-bridge motor control circuits can be
applied as shown in Figure 4. In this configuration the
motor can be controlled to run clockwise, counter-clockwise, stop rapidly (“regeneration” braking) or free run
(coast) to a stop.
www.analogictech.com
4901.2008.03.1.0
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
On/Off (EN)
VIN: 2.0V ~ 5.5V
VCC
PWM1
SW1
CIN
GND
FB
2 -Phase
DC/DC
Controller PWM2
SW2
1
2
3
4
ENA
END
IN
OUTA
AAT4901-3
ENB
OUTB
ENC
GND
8
7
IL1
6
IL2
L1
IL1 + IL2
VOUT
L2
5
R1
CO
R2
Figure 2: AAT4901 in 2-Phase Synchronous Buck Converter Power Stage.
OUTA
OUTB
IL2
IL1
IL1+IL2
Figure 3: Output Current Ripple Reduction (IL1+IL2) due to 2-Phase Cancellation.
When the voltage applied between the DC motor by the
input(s) logic control is reversed, it could change the
rotation direction. When both outputs (OUTA/OUTB) are
floating, the motor winding acts as a regeneration; the
current inside the motor winding would continue to flow
into the input capacitor through the internal MOSFET
parasitic diode and decay to zero rapidly, stopping the
motor rapidly. When both outputs are connected to the
input supply (or ground) simultaneously, the motor
coasts and the winding current decays slowly due to the
winding resistor until the motor free runs to a stop.
The speed of a DC motor is directly proportional to the
supply voltage. It can be controlled by simply adjusting
the voltage sent to the motor, but this is quite inefficient.
4901.2008.03.1.0
A better method is to switch the motor’s supply on and off
rapidly. If the switching is fast enough, the motor doesn’t
notice it, it only notices the average effect. The time it
takes a motor to speed up and slow down under switching
conditions is dependent on the inertia of the rotor (basically how heavy it is) and the amount of friction and load
torque. Figure 5 shows the speed of a motor that is being
turned on and off at a fairly low switching frequency. The
average speed is around 150, although it varies quite a
bit. If the supply voltage is switched quickly enough, the
motor will not have time to change speed much and the
speed will be quite steady. When the duty cycle (D =
TON/T) is increased, the average speed of the motor
increases. Thus the speed is controlled by the duty cycle
of the PWM (Pulse Width Modulation).
www.analogictech.com
11
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
VIN: 2.0~5.5V
VIN: 2.0~5.5V
1
CLK/DIR
8
ENA
2
EN
IN
OUTA
AAT4901-1
3
4
C1
4.7µF/16V
ENB
OUTB
N/C
GND
1
CLK/DIR
Brake
N/C
7
2
M
6
CLK/DIR
3
Brake
5
4
C1
4.7µF/16V
ENA
N/C
IN
OUTA
AAT4901-2
ENB
OUTB
N/C
GND
8
7
M
6
5
VIN: 2.0~5.5V
VIN: 2.0~5.5V
EN
1
CLK/DIR
8
ENA
CLK/DIR
END
2
1
N/C
ENA
8
7
IN
2
M
OUTA
AAT4901-3
3
IN
6
ENB
OUTB
ENC
GND
3
OUTA
AAT4901-4
ENB
OUTB
N/C
GND
7
M
6
5
4
4
C1
4.7µF/16V
5
C1
4.7µF/16V
Figure 4: Full-Bridge Motor Driver Using AAT4901.
200
20
Motor Speed
15
100
10
Supply Voltage
50
Supply Voltage
Motor Speed
150
5
0
0
Ton
T
Time
Figure 5: Motor Speed vs. Supply Voltage.
12
www.analogictech.com
4901.2008.03.1.0
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
There is also a diode connected in reverse across the field
winding, to absorb the current in the field winding when
all four MOSFETs in the bridge are turned off.
The minimum switching frequency is chosen based on
motor characteristics (the equivalent inductance and the
parasitic series resistor) and the percentage of current
variation to the average current specified. The minimum
switching frequency is in direct proportion to the parasitic series resister, and in inverse proportion to the
equivalent inductance and allowable current ripple.
During period (A), to make the motor run forwards, Q4
is turned on, and Q1 has the PWM signal applied to it.
The current path is shown in blue in Figure 7. At period
(B) Q4 is kept on, so when the Q1 PWM signal is off, current can continue to flow around the bottom loop through
Q3’s parasitic diode. At period (C), to make the motor
run backwards or control the speed, Q3 is turned on, and
Q2 has the PWM signal applied to it. At period (D), Q3 is
kept on, so when the Q2 PWM signal is off, current can
continue to flow around the bottom loop through Q4’s
parasitic diode. At period (E), when the motor is running
forwards for example, the motor is now acting as a generator and forcing current through its armature, through
Q2’s diode, through the battery (thereby charging the
battery) and back through Q3’s diode.
When driving a high-voltage DC motor, external highvoltage MOSFETs are needed to commutate the motor.
In this application, the AAT4901 can be configured as a
double-ended gate driver, as illustrated in Figure 6.
The full-bridge power stage operates the motor drive control as shown in Figure 7. Each side of the motor can be
connected either to the battery's positive terminal or to
the battery's negative terminal through the switch. Note
that only one MOSFET on each side of the motor may be
turned on at any one time; otherwise the high-side and
low-side MOSFETs will short out the battery and burn out.
High-Voltage
Rail
VIN: 5.0V
CLK1
1
2
CLK2
3
4
C1
4.7µF/16V
ENA
N/C(END)
IN
OUTA
AAT4901-1,-2,-4
(-3)
ENB
OUTB
N/C(ENC)
GND
8
7
to Motor
6
5
Figure 6: Double-Ended Gate Driver.
4901.2008.03.1.0
www.analogictech.com
13
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
VBAT +
VBAT +
Lf
Lf
Field winding
Field winding
Q1
Q2
Q1
Q2
La
La
Ia
Ia
Q3
Q4
armature
Q3
VBAT -
Q4
armature
VBAT Period (A)
Period (B)
VBAT +
VBAT +
Lf
Field winding
Lf
Q1
Field winding
Q2
Q1
La
Q2
La
Ia
Q3
Ia
Q4
armature
Q3
VBAT -
Q4
armature
VBAT Period (D)
Period (C)
VBAT +
Lf
Field winding
Q1
Q2
La
Ia
Q3
armature
Q4
VBAT Period (E)
Figure 7: Full-Bridge Motor Drive Control.
Dual Channel, High Speed,
High Current 3-State Line Driver
Dual Low-Side MOSFET 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 dissipation makes this part attractive in battery powered products. 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.
14
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
RDS(ON) (220/160mΩ typ.) and very fast propagation time
(20ns typ.)
www.analogictech.com
4901.2008.03.1.0
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
ENA
3-State
IN
ENB
OUTA
ENC
OUTB
END
3-State
GND
Figure 8: AAT4901-3 Dual Channel High-Speed High-Current 3-State Line Driver.
VOUT
VIN
+
+
VCC: 5.0V
EN
PWM A
1
2
3
PWM B
4
ENA
END
OUTA
IN
AAT4901-3
ENB
OUTB
ENC
GND
8
7
6
5
C1
4.7µF/16V
Figure 9: Push-Pull Topology MOSFET Driver with AAT4901.
4901.2008.03.1.0
www.analogictech.com
15
PRODUCT DATASHEET
AAT4901
FastSwitchTM
Buffered Power Full-Bridge
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
SC70JW-8
SC70JW-8
SC70JW-8
SC70JW-8
XXGYY
XXGYY
XXGYY
2SGYY
AAT4901IJS-1-T1
AAT4901IJS-2-T1
AAT4901IJS-3-T1
AAT4901IJS-4-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means semiconductor
products that are in compliance with current RoHS standards, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. For more information, please visit our website at
http://www.analogictech.com/about/quality.aspx.
Package Information
SC70JW-8
2.20 ± 0.20
1.75 ± 0.10
0.50 BSC 0.50 BSC 0.50 BSC
0.225 ± 0.075
2.00 ± 0.20
0.100
7° ± 3°
0.45 ± 0.10
4° ± 4°
0.05 ± 0.05
0.15 ± 0.05
1.10 MAX
0.85 ± 0.15
0.048REF
2.10 ± 0.30
All measurements in millimeters.
1. XXGYY: XX denotes Device code, G denotes assembly code, and YY denotes date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Advanced Analogic Technologies, Inc.
3230 Scott Boulevard, Santa Clara, CA 95054
Phone (408) 737-4600
Fax (408) 737-4611
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual
property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and
conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate
design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to
support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other
brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
16
www.analogictech.com
4901.2008.03.1.0