LT3437IFE#TRPBF Linear Technology, LT3437IFE#TRPBF Datasheet - Page 9

• Manufacturer Part Number: LT3437IFE#TRPBF
• Description: IC REG SW HV 500MA 16-TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT3437IFE#TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 54 V
• Current - Output: 500mA
• Frequency - Switching: 200kHz
• Voltage - Input: 3.3 ~ 60 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

PI FU CTIO S
BIAS (Pin 6/Pin 10): The BIAS pin is used to improve
efficiency when operating at higher input voltages and
light load current. Connecting this pin to the regulated
output voltage forces most of the internal circuitry to draw
its operating current from the output voltage rather than
the input supply. This architecture increases efficiency
especially when the input voltage is much higher than the
output. Minimum output voltage setting for this mode of
operation is typically 2.7V.
V
amplifier and the input of the peak switch current comparator.
It is normally used for frequency compensation, but can also
serve as a current clamp or control loop override. V
about 0.45V for light loads and 1.5V at maximum load.
During the sleep portion of Burst Mode operation, the V
pin is held at a voltage slightly below the burst threshold for
better transient response. Driving the V
will disable switching and place the IC into sleep mode.
FB (Pin 8/Pin 12): The feedback pin is used to determine
the output voltage using an external voltage divider from
the output that generates 1.25V at the FB pin. When the FB
C
U
(Pin 7/Pin 11): The V
U
U
C
(DD/FE)
pin is the output of the error
C
pin to ground
C
sits at
C
pin drops below 0.9V, switching frequency is reduced, the
SYNC function is disabled and output ramp rate control is
enabled via the C
Applications Information for details.
SYNC (Pin 9/Pin 14): The SYNC pin is used to synchronize
the internal oscillator to an external signal. It is directly
logic compatible and can be driven with any signal be-
tween 25% and 75% duty cycle. The synchronizing range
is equal to maximum initial operating frequency up to
700kHz. When the voltage on the FB pin is below 0.9V the
SYNC function is disabled. When a synchronization signal
or logic-level high is present at the SYNC pin, Burst Mode
operation is disabled. See the synchronizing section in
Applications Information for details.
SHDN (Pin 10/Pin 15): The SHDN pin is used to turn off the
regulator and to reduce input current to less than 1µA. The
SHDN pin requires a voltage above 1.3V with a typical source
current of 5µA to take the IC out of the shutdown state.
Exposed Pad (Pin 11/Pin 17): Ground. Must be soldered
to the PCB.
SS
pin. See the Feedback section in
LT3437
3437fc
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