®
L9997ND
DUAL HALF BRIDGE DRIVER
HALF BRIDGE OUTPUTS WITH TYPICAL
R
ON
= 0.7
Ω
OUTPUT CURRENT CAPABILITY
±
1.2A
OPERATING SUPPLY VOLTAGE RANGE 7V
TO 16.5V
SUPPLY OVERVOLTAGE PROTECTION
FUNCTION FOR V
VS
UP TO 40V
VERY LOW QUIESCENT CURRENT IN
STANDBY MODE < 1
µ
A
CMOS COMPATIBLE INPUTS WITH HYS-
TERESIS
OUTPUT SHORT-CIRCUIT PROTECTION
THERMAL SHUTDOWN
REAL TIME DIAGNOSTIC: THERMAL OVER-
LOAD, OVERVOLTAGE
DESCRIPTION
The L9997ND is a monolithic integrated driver, in
BCD technology intended to drive various loads,
BLOCK DIAGRAM
VS
1
EN
10 ENABLE
VS
MULTIPOWER BCD TECHNOLOGY
SO20 (12+4+4)
ORDERING NUMBERS: L9997ND
L9997ND013TR including DC motors. The circuit is optimized for automotive electronics enviromental conditions.
REFERENCE
BIAS
PROTECTION
FUNCTIONS
11
DIAG
5V
VS
IN1
12 DRIVER 1
19
OUT1
IN2
9 DRIVER 2
VS
2
OUT2
4...7, 14...17
GND
M
September 2013 DocID 6276 Rev 3 1/9
L9997ND
ABSOLUTE MAXIMUM RATINGS
Symbol
V
VSDC
V
VSP
I
OUT
V
IN1,2
V
EN
V
DIAG
I
OUT
I
DIAG
Parameter
DC Supply Voltage
Supply Voltage Pulse (T < 400ms)
DC Output Current
DC Input Voltage
Enable Input Voltage
DC Output Voltage
DC Output Short-circuit Current -0.3V < V
OUT
< V
S
+ 0.3V
DC Sink Current -0.3V < V
DG
< 7V
PIN CONNECTION (Top view)
Value
-0.3 to 26
40
±
1.8
-0.3 to 7
-0.3 to 7
-0.3 to 7 internally limited internally limited
V
S
OUT2
N.C.
GND
GND
GND
GND
N.C.
IN2
EN
6
7
4
5
8
1
2
3
9
10
15
14
13
12
11
20
19
18
17
16
N.C.
OUT1
N.C.
GND
GND
GND
GND
N.C.
IN1
DIAG
D95AT166
PIN FUNCTIONS
N.
1
2
3, 8, 13,
18,20
4 to 7,
14 to 17
9
10
11
12
Name
VS
OUT2
NC
GND
IN2
EN
DIAG
IN1
Function
Supply Voltage
Channel 2: Push-Pull power output with intrinsic body diode
NC: Not Connected
Ground: signal - and power - ground, heat sink
Input 2: Schmitt Trigger input with hysteresis (non-inverting signal control)
Enable: LOW or not connected on this input switches the device into standby mode and the outputs into tristate
Diagnostic: Open Drain Output that switches LOW if overvoltage or overtemperature is detected
Input 1: Schmitt Trigger input with hysteresis (non-inverting signal control)
THERMAL DATA
Symbol
T jTS
T jTSH
R th j-amb
R th j-pins
(1) With 6cm
2
on board heatsink area.
Parameter
Thermal Shut-down Junction Temperature
Thermal Shut-down Threshold Hysteresis
Thermal Resistance Junction-Ambient
(1)
Thermal Resistance Junction-Pins
2/9
Value
165
25
50
15
Unit
°C
K
K/W
K/W
Unit
V
V
V
V
A
V
L9997ND
ELECTRICAL CHARACTERISTICS (7V < V
S
<
16.5V; -40°C < T
J
< 150°C; unless otherwise specified.)
Symbol
I
VS_SB
I
VS
V
ENL
V
ENH
V
ENthh
I
EN
V
IN1,2L
V
IN1,2H
V
IN1,2thh
I
IN1,2
R
ON OUT1,2
|I
OUT1,2
|
V
DIAG
Parameter
Quiescent Current in Standby
Mode
Supply Current
Low Enable Voltage
High Enable Voltage
Enable Threshold Hysteresis
Enable Input Current
Low Input Voltage
High Input Voltage
Input Threshold Hysteresis
Input Bias Current
ON-Resistance to Supply or
GND
Output Current Limitation
Diagnostic Output Drop
Test Condition
V
EN
V
EN
<
0.3V; V
= 0; V
VS
VS
<16.5V; T
=
14.5V; T j j
<
85°(*)
= 25°C
EN = HIGH, I
OUT1,2
= 0
V
EN
= 5V
V
IN
= 0
V
IN
= 5V, EN = HIGH
I
I
OUT
I
OUT
OUT
=
±
0.8A; V
=
±
0.8A; V
VS
VS
= 7V; T j
= 125°C
= 12V; T j
= 125°C
=
±
0.8A; V
VS
= 12V; T j
= 25°C
I
DIAG
= 0.5mA, EN = HIGH
Overvoltage or Thermal Shutdown
Min.
3.5
3.5
-3
2
1.2
Typ.
<1
<1
2
1
85
1
0
10
1.2
1.1
0.7
1.6
Max.
90
10
6
1.5
6
250
1.5
1
50
2.8
2.25
2.2
0.6
Unit
µ
A
µ
A mA
V
V
V
µ
A
V
V
V
µ
A
µ
A
Ω
Ω
Ω
A
V
V
VSOVth t
ONLH t
ONHL t
OFFHL t
OFFLH t dHL t dLH t rHS t rLS t fHS t fLS
Supply Overvoltage
Threshold
Turn on Delay Time
Turn off Delay Time
Rising Delay Time
Falling Delay Time
Rise Time
Fall Time
* Tested at 125°C and guaranteed by correlation
See Fig. 2; V
VS
= 13.5V
Measured with 93
Ω
load
17 19
50
30
30
60
25
50
10
2
115
115
21
150
150
100
150
100
150
100
20
250
250
V
µ s
µ s
µ s
µ s
µ s
µ s
µ s
µ s
µ s
µ s
FUNCTIONAL DESCRIPTION
The L9997ND is a motor driver two half-bridge
Table 1. Table function.
Status
1
2
3
4
5
6
H
H
H
H
EN
L
H
H
L
L
X
IN1
X
H
L
H
L
X
IN2
X
H outputs, intended for driving dc motors in automotive systems. The basic function of the device is shown in the Table 1.
OUT1
Tristate
SRC
SRC
SNK
SNK
Tristate
OUT2
Tristate
SRC
SNK
SRC
SNK
Tristate
DIAG
OFF
OFF
OFF
OFF
OFF
ON
NOTE
Standby Mode
Recommended for braking
Overvoltage or Overtemperature
3/9
L9997ND
The device is activated with enable input voltage
HIGH. For enable input floating (not connected) or LOW the device is in Standby Mode. Very low quiescent current is defined for V
EN
< 0.3V. When activating or disactivating the device by the enable input a wake-up time of 50
µ s is recommended.
For braking of the motor the status 2 is recommended. The reason for this recommendation is that the device features higher threshold for initialisation of parasitic structures than in state 5.
The inputs IN1, IN2 features internal sink current generators of 10
µ
A, disabled in standby mode.
With these input current generators the input level is forced to LOW for inputs open. In this condition the outputs are in SNK state.
The circuit features an overvoltage disable function referred to the supply voltage V
VS
. This function assures disabling the power outputs, when the supply voltage exceeds the over voltage threshold value of 19V typ. Both outputs are forced to tristate in this condition and the diagnostic output is ON.
The thermal shut-down disables the outputs (tristate) and activates the diagnostic when the junction temperature increases above the thermal shut-down threshold temperature of min. 150°C.
For the start of a heavy loaded motor, if the motor current reaches the max. value, it is necessary to respect the dynamical thermal resistance junction to ambient. The outputs OUT1 and OUT2 are protected against short circuit to GND or V
S
, for supply voltages up to the overvoltage disable threshold.
The output power DMOS transistors works in linear mode for an output current less than 1.2A. Increasing the output load current (> 1.2A) the output transistor changes in the current regulation mode, see Fig.6, with the typical output current value below 2A. The SRC output power DMOS transistors requires a voltage drop ~3V to activate the current regulation. Below this voltage drop is the device also protected. The output current heat up the power DMOS transistor, the R
DSON
increases with the junction temperature and decreases the output current. The power dissipation in this condition can activate the thermal shutdown . In the case of output disable due to thermal overload the output remains disabled untill the junction temperature decreases under the thermal enable threshold.
Permanent short circuit condition with power dissipation leading to chip overheating and activation of the thermal shut-down leads to the thermal oscillation. The junction temperature difference between the switch ON and OFF points is the thermal hysteresis of the thermal protection. This hysteresis together with the thermal impedance and ambient temperature determines the frequency of this thermal oscillation, its typical values are in the range of 10kHz.
The open drain diagnostic output needs an external pull-up resistor to a 5V supply. In systems with several L9997ND the diagnostic outputs can be connected together with a common pull-up resistor. The DIAG output current is internally limited.
Fig. 1 shows a typical application diagram for the
DC motor driving. To assure the safety of the circuit in the reverse battery condition a reverse protection diode D
1
is necessary. The transient protection diode D
2
must assure that the maximal supply voltage V
VS
during the transients at the
V
BAT
line will be limited to a value lower than the absolute maximum rating for V
VS
.
Figure 1: Application Circuit Diagram.
5V
CONTROL
LOGIC
47K
Ω
IDIAG1
DIAG1
IIN1
IN1
IIN2
IN2
IEN
EN
I s
C
S
D
2
D
1
V
BAT
V
S
OUT1
IOUT1
IM
L9997ND
GND
OUT2
IOUT2
M
VM
GND
4/9
Figure 2. Timing Diagram.
Standby Mode Operating Mode
EN
IN1
IN2
DIAG tONHL t dLH
OUT1 Tristate tONLH
OUT2
50%
Tristate
10% t r
90%
10% t r
90% t dHL t f t dHL t f t dLH
Figure 3. Typical R
ON
- Characteristics of Source and Sink Stage
Overtemperature or Overvoltage
L9997ND
Standby Mode t dLH t dHL tOFFLH
Tristate t dHL
Tristate t dLH
Tristate tOFFHL
Tristate
5/9
L9997ND
Figure 4. Quiescent current in standby mode versus supply voltage.
Figure 5. ON-Resistance versus supply voltage.
6/9
Figure 6. I
OUT
versus V
OUT
(pulsed measurement with T
ON
= 500
µ s, T
OFF
= 500ms).
L9997ND
Figure 7. Test circuit.
12V
100µF 200nF
EN
IN1
IN2
VS
L9997ND
DIAG
10k
Ω
OUT1
15
Ω
OUT2 15
Ω
5V
V
EN
V
IN1 V
IN2
GND
7/9
L9997ND
8/9
L9997ND
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DocID 6276 Rev 3 9/9
