L6910TR STMicroelectronics, L6910TR Datasheet - Page 3

• Manufacturer Part Number: L6910TR
• Description: IC PWM BUCK BST VM 16SOIC
• Manufacturer: STMicroelectronics

Specifications of L6910TR

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 230kHz
• Duty Cycle: 100%
• Voltage - Supply: 5 V ~ 12 V
• Buck: Yes
• Boost: Yes
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 16-SOIC (3.9mm Width)
• Frequency-max: 230kHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3656; 497-3656-2; 497-3656

Table 4. Pins Function
SO
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
HTSSOP
10
11
12
13
14
16
1
2
3
4
6
7
8
9
5
5
PGOOD This pin is an open collector output and it is pulled low if the output voltage is not within the
OCSET A resistor connected from this pin and the upper Mos Drain sets the current limit
PHASE
SS/INH
EAREF
HGATE
LGATE
COMP
PGND
BOOT
Name
VREF
OSC
GND
VCC
N.C.
FB
Internal 0.9V ±1.5% reference is available for external regulators or for the internal error
amplifier (connecting this pin to EAREF) if external reference is not available.
A minimum 1nF capacitor is required.
If the pin is forced to a voltage lower than 70%, the device enters the hiccup mode.
Oscillator switching frequency pin. Connecting an external resistor (R
GND, the external frequency is increased according to the equation:
Connecting a resistor (R
according to the equation:
If the pin is not connected, the switching frequency is 200KHz.
The voltage at this pin is fixed at 1.23V. Forcing a 50 A current into this pin, the built in
oscillator stops to switch.
In Over Voltage condition this pin goes over 3V until that conditon is removed.
protection.
The internal 200 A current generator sinks a constant current through the external
resistor. The Over-Current threshold is due to the following equation:
The soft start time is programmed connecting an external capacitor from this pin and
GND. The internal current generator forces through the capacitor 10 A.
This pin can be used to disable the device forcing a voltage lower than 0.4V
This pin is connected to the error amplifier output and is used to compensate the voltage
control feedback loop.
This pin is connected to the error amplifier inverting input and is used to compensate the
voltage control feedback loop.
Connected to the output resistor divider, if used, or directly to Vout, it manages also over-
voltage conditions and the PGOOD signal
All the internal references are referred to this pin. Connect it to the PCB signal ground.
Error amplifier non-inverting input. Connect to this pin an external reference (from 0.9V to
3V) for the PWM regulation or short it to VREF pin to use the internal reference.
If this pin goes under 650mV (typ), the device shuts down.
above specified thresholds. If not used it may be left floating.
This pin is connected to the source of the upper mosfet and provides the return path for the
high side driver. This pin monitors the drop across the upper mosfet for the current limit
together with OCSET.
High side gate driver output.
Bootstrap capacitor pin. Through this pin is supplied the high side driver and the upper
mosfet. Connect through a capacitor to the PHASE pin and through a diode to Vcc
(cathode vs. boot).
Power ground pin. This pin has to be connected closely to the low side mosfet source in
order to reduce the noise injection into the device
This pin is the lower mosfet gate driver output
Device supply voltage. The operative supply voltage ranges is from 5V to 12V.
DO NOT CONNECT V
This pin is not internally bonded. It may be left floating or connected to GND.
IN
T
TO A VOLTAGE GREATER THAN V
) from this pin to Vcc (12V), the switching frequency is reduced
f
f
OSC,RT
OSC,RT
I
P
=
=
=
Description
I
--------------------------------------------- -
200KHz
OCSET
200KHz
R
DSon
R
–
+
OCSET
4.306 10
---------------------------- -
4.94 10
------------------------ -
R
R
T
T
K
K
6
7
CC
.
L6910 - L6910A
T
) from this pin to
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