L6910GTR STMicroelectronics, L6910GTR Datasheet - Page 3

• Manufacturer Part Number: L6910GTR
• Description: IC PWM BUCK BST VM 16SOIC
• Manufacturer: STMicroelectronics

Specifications of L6910GTR

• 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
• Topology: Step Down
• Output Voltage: 0.9 V to 12 V
• Output Current: 1300 mA
• Switching Frequency: 50 KHz to 1000 KHz
• Duty Cycle (max): 100 %
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Synchronous Pin: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6111-2

Table 4. Pins Function
Pin
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
PGOOD This pin is an open collector output and it is pulled low if the output voltage is not within the above
OCSET A resistor connected from this pin and the upper Mos Drain sets the current limit protection.
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
external frequency is increased according to the equation:
Connecting a resistor (R
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 50µA 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.
The internal 200µA 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 10µA.
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.
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).
VBOOT limited to VOCSET -10V(typ.) when all other pins are connected to GND.
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
) from this pin to Vcc (12V), the switching frequency is reduced according to
TO A VOLTAGE GREATER THAN V
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
(
(
KΩ
KΩ
⋅
⋅
CC
)
)
6
7
.
T
) from this pin to GND, the
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