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BTS7751G
Smart Motorbridges + Driver ICs
TrilithIC
Data Sheet
BTS7751G
1Overview
1.1FeaturesQuad D-MOS switch driverFree configurable as bridge or quad-switchOptimized for DC motor management applications
Low RDSON: 70mΩ high-side switch, 45mΩ low-
side switch (typical values @25°C) Maximum peak current: typ. 14 A @ 25°C=Very low quiescent current: typ. 5 µA @ 25 °C=Small outline, enhanced power P-DSO-package Full short-circuit-protectionOperates up to 40 VStatus flag diagnosisOvertemperature shut down with hysteresisInternal clamp diodesOpen load detection in Off-modeUnder-voltage detection with hysteresisPWM frequencies up to 1 kHz
1.2DescriptionThe BTS
7751G is part of the TrilithIC family containing three dies in one package:
One double high-side switch and two low-side switches. The drains of these three
vertical DMOS chips are mounted on separated lead frames. The sources are connected
to individual pins, so the BTS
7751G can be used in H-bridge- as well as in any otherconfiguration. Both the double high-side and the two low-side switches of the
BTS7751G are manufactured in SMART SIPMOS® technology which combines low
RDSON vertical DMOS power stages with CMOS control circuitry. The high-side switch isfully protected and contains the control and diagnosis circuitry. Also the low-side
switches are fully protected, the equivalent standard product is the BSP
78.In contrast to the
BTS7750G, the BTS7751G offers an open load in Off-modedetection and slightly increased current limitation.
1.3Pin Configuration(top view)
Figure 1
Pins written in bold type need power wiring.
1.4Pin Definitions and FunctionsTo reduce the thermal resistance these pins are direct connected via metal bridges to the lead frame.
1.5Functional Block Diagram
Figure 2
Block Diagram
1.6Circuit Description
Input CircuitThe control inputs IH1,2 consist of TTL/CMOS compatible Schmitt-Triggers with
hysteresis. Buffer amplifiers are driven by these stages and convert the logic signal into
the necessary form for driving the power output stages. The inputs are protected by ESD
clamp-diodes.
The inputs IL1 and IL2 are connected to the internal gate-driving units of the N-channel
vertical power-MOS-FETs.
Output StagesThe output stages consist of an low RDSON Power-MOS H-bridge. In H-bridge
configuration, the D-MOS body diodes can be used for freewheeling when commutating
inductive loads. If the high-side switches are used as single switches, positive and
negative voltage spikes which occur when driving inductive loads are limited by
integrated power clamp diodes.
Short Circuit Protection The outputs are protected againstoutput short circuit to groundoutput short circuit to the supply voltage, andoverload (load short circuit).
An internal OP-Amp controls the Drain-Source-Voltage by comparing the DS-Voltage-
Drop with an internal reference voltage. Above this trippoint the OP-Amp reduces the
output current depending on the junction temperature and the drop voltage.
In the case of overloaded high-side switches the status output is set to low.
The fully protected low-side switches have no status output.
Overtemperature Protection The high-side and the low-side switches also incorporate an overtemperature protection
circuit with hysteresis which switches off the output transistors. In the case of the high-
side switches, the status output is set to low.
Under voltage-Lockout (UVLO)When VS reaches the switch-on voltage VUVON the IC becomes active with a hysteresis.
The High-Side output transistors are switched off if the supply voltage VS drops below
the switch off value VUVOFF.
Open Load DetectionOpen load is detected by voltage measurement in Off state. If the output voltage exceeds
a specified level the error flag is set with a delay.
Status FlagThe status flag output is an open drain output with Zener-diode which requires a pull-up
resistor, c.f. the application circuit on page14. Various errors as listed in the table
“Diagnosis” are detected by switching the open drain output ST to low. Forward current
in the integrated body diode of the high-side switch may cause undefined voltage levels
at the corresponding status output. The open load detection can be used to detect a
short to Vs as long as both low-side switches are off and ROL is disconnected from 5V
by BCR192W.
Truth table and Diagnosis (valid only for the High-Side-Switches)Inputs:Outputs:Status:
0 = Logic LOWZ = Output in tristate condition1 = No error
1 = Logic HIGHL = Output in sink condition0 = Error
X = don’t careH = Output in source condition
Electrical Characteristics3.1Absolute Maximum Ratings– 40 °C < Tj < 150 °C
High-Side-Switches (Pins DHVS, IH1,2 and SH1,2)Note:
* single pulse ** internally limited
Status Output ST
Low-Side-Switches (Pins DL1,2, IL1,2 and SL1,2)Note:
* single pulse ** internally limited
Temperatures
Note:Maximum ratings are absolute ratings; exceeding any one of these values may
cause irreversible damage to the integrated circuit.
Note:In the operating range the functions given in the circuit description are fulfilled.
Thermal Resistances (one HS-LS-Path active)
ESD Protection (Human Body Model acc. MIL STD 883D, method 3015.7 and EOS/ESD assn. standard S5.1 - 1993)
3.2Operating Range– 40 °C < Tj < 150 °C
3.1Absolute Maximum Ratings (cont’d)– 40 °C < Tj < 150 °C
