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L6995D Datasheet(PDF) 3 Page - STMicroelectronics

Part # L6995D
Description  STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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L6995
8
VFB
PWM comparator feedback input. Short this pin to INT pin when using the integrator function, or
to VSENSE pin without integrator.
9
OSC
Connect this pin to the input voltage through a voltage divider in order to provide the feed-
forward function. It cannot be left floating.
10
SS
Soft start pin. A 5
µA constant current charges an external capacitor which value sets the soft-
start time.
11
ILIM
An external resistor connected between this pin and GND sets the current limit threshold.
12
SHDN
Shutdown. When shorted to GND the device stops working; when high, it enables the normal
operation. It cannot be left floating.
13
OVP
Open drain output. When in OVP condition, the internal transistor goes off. Connect this pin to
VCC through a resistor.
14
PGOOD
Open drain output. The internal transistor is on during soft-start or in case of output voltage
faults. Connect this pin to VCC through a resistor.
15
PGND
Low Side driver ground.
16
LGATE
Low Side driver output.
17
VDR
Low Side driver supply.
18
PHASE
Return path of the High Side driver.
19
HGATE
High side MOSFETS driver output.
20
BOOT
Bootstrap capacitor pin. High Side driver is supplied through this pin.
ELECTRICAL CHARACTERISTICS
(VCC = VDR = 5V; Tamb = 0°C to 85°C unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY SECTION
Vin
Input voltage range
Vout=Vref Fsw=110Khz Iout=1A
1.5
28
V
VCC,
VDR
4.5
5.5
V
VCC
Turn-onvoltage
4.2
4.4
V
Turn-off voltage
4.1
4.3
V
Iqcc
(VDR)
Driver quiescent current
VFB > VREF
20
µA
Iqcc
(Vcc)
Quiescent current
VFB > VREF
600
µA
SHUTDOWN SECTION
SHDN
Device On
1.2
V
Device Off
0.6
V
ISH
(VDR)
Driver quiescent current in
shutdown
SHDN to GND
5
µA
ISH
(VCC)
Shut down current
SHDN to GND
15
µA
SOFT START SECTION
ISS
Soft Start current
4
6
µA
SS Clamp Voltage
4
V
ON TIME
Ton
On time duration
VREF=VSENSE OSC=250mV
850
950
1050
ns
PIN FUNCTION (continued)
Name
Description


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