LT3758EMSE#PBF Linear Technology, LT3758EMSE#PBF Datasheet - Page 8

• Manufacturer Part Number: LT3758EMSE#PBF
• Description: IC CTRLR DC/DC ADJ 10-MSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost), Inverting, Flyback, Sepicr

Specifications of LT3758EMSE#PBF

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Frequency - Switching: 100kHz ~ 1MHz
• Voltage - Input: 5.5 ~ 100 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP Exposed Pad, 10-HMSOP, 10-eMSOP
• Dc To Dc Converter Type: FLYBACK CONTROLLER
• Pin Count: 10
• Input Voltage: 5.5 to 100V
• Output Voltage: 1.6 to 100V
• Package Type: MSOP EP
• Mounting: Surface Mount
• Operating Temperature Classification: Automotive
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Compliant

PIN FUNCTIONS
LT3758
VC (Pin 1): Error Amplifi er Compensation Pin. Used to
stabilize the voltage loop with an external RC network.
FBX (Pin 2): Positive and Negative Feedback Pin. Receives
the feedback voltage from the external resistor divider
across the output. Also modulates the switching frequency
during start-up and fault conditions when FBX is close
to GND.
SS (Pin 3): Soft-Start Pin. This pin modulates compensation
pin voltage (VC) clamp. The soft-start interval is set with
an external capacitor. The pin has a 10μA (typical) pull-up
current source to an internal 2.5V rail. The soft-start pin is
reset to GND by an undervoltage condition at SHDN/UVLO,
an INTV
internal thermal lockout.
RT (Pin 4): Switching Frequency Adjustment Pin. Set the
frequency using a resistor to GND. Do not leave this pin
open.
SYNC (Pin 5): Frequency Synchronization Pin. Used to
synchronize the switching frequency to an outside clock.
If this feature is used, an R
to program a switching frequency 20% slower than the
SYNC pulse frequency. Tie the SYNC pin to GND if this
feature is not used. SYNC is bypassed when FBX is close
to GND.
SENSE (Pin 6): The Current Sense Input for the Control
Loop. Kelvin connect this pin to the positive terminal of
the switch current sense resistor in the source of the NFET.
The negative terminal of the current sense resistor should
be connected to GND plane close to the IC.
8
CC
undervoltage or overvoltage condition or an
T
resistor should be chosen
GATE (Pin 7): N-Channel MOSFET Gate Driver Output.
Switches between INTV
IC is shut down, during thermal lockout or when INTV
is above or below the overvoltage or UV thresholds,
respectively.
INTV
Gate Driver. Supplied from V
(typical). INTV
of 4.7μF capacitor placed close to pin. INTV
connected directly to V
can also be connected to a power supply whose voltage is
higher than 7.5V, and lower than V
does not exceed 17.5V.
SHDN/UVLO (Pin 9): Shutdown and Undervoltage Detect
Pin. An accurate 1.22V (nominal) falling threshold with
externally programmable hysteresis detects when power
is okay to enable switching. Rising hysteresis is generated
by the external resistor divider and an accurate internal
2μA pull-down current. An undervoltage condition resets
sort-start. Tie to 0.4V, or less, to disable the device and
reduce V
V
with a 0.22μF, or larger, capacitor placed close to the
pin.
Exposed Pad (Pin 11): Ground. This pin also serves as the
negative terminal of the current sense resistor. The Exposed
Pad must be soldered directly to the local ground plane.
IN
(Pin 10): Input Supply Pin. Must be locally bypassed
CC
(Pin 8): Regulated Supply for Internal Loads and
IN
quiescent current below 1μA.
CC
must be bypassed with a minimum
IN
CC
, if V
and GND. Driven to GND when
IN
IN
is less than 17.5V. INTV
IN
and regulated to 7.2V
, provided that supply
CC
can be
3758fb
CC
CC