LT3434IFE#PBF Linear Technology, LT3434IFE#PBF Datasheet - Page 3

• Manufacturer Part Number: LT3434IFE#PBF
• Description: IC REG SW BUCK 3A 200KHZ 16TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT3434IFE#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.25 ~ 54 V
• Current - Output: 3A
• 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
• Primary Input Voltage: 60V
• No. Of Outputs: 1
• Output Voltage: 54V
• Output Current: 6.5A
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

temperature range, otherwise specifications are at T
C
SYMBOL
I
I
I
V
I
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3434EFE is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3434IFE is guaranteed and tested over the full –40°C to 125°C
operating junction temperature range.
Note 3: Minimum input voltage is defined as the voltage where switching
starts. Actual minimum input voltage to maintain a regulated output will
depend upon output voltage and load current. See Applications
Information.
Note 4: Supply input current is the quiescent current drawn by the input
pin. Its typical value depends on the voltage on the BIAS pin and operating
state of the LT3434. With the BIAS pin at 0V, all of the quiescent current
required to operate the LT3434 will be provided by the V
BIAS voltage above its minimum input voltage, a portion of the total
quiescent current will be supplied by the BIAS pin. Supply sleep current is
defined as the quiescent current during the “sleep” portion of Burst Mode
operation. See Applications Information for determining application supply
currents.
ELECTRICAL CHARACTERISTICS
PK
CSS
PGFB
CT
SS
PGFB
CT
/SYNC = 0V unless otherwise noted.
PARAMETER
V
SW Current Limit
Switch On Resistance (Note 9)
Switching Frequency
Maximum Duty Cycle
Minimum SYNC Amplitude
SYNC Frequency Range
SYNC Input Impedance
C
PGFB Input Current
PGFB Voltage Threshold (Note 11)
C
C
C
PG Leakage (Note 11)
PG Sink Current (Note 11)
C
SS
T
T
T
Source Current (Note 11)
Sink Current (Note 11)
Voltage Threshold (Note 11)
High Clamp
Current Threshold (Note 10)
IN
pin. With the
CONDITIONS
FB = 1.15V
FB = 0V
PGFB = 1V, PG = 400mV
J
= 25°C. V
The
●
IN
denotes the specifications which apply over the full operating
= 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V,
Note 5: Minimum BIAS voltage is the voltage on the BIAS pin when I
sourced into the pin.
Note 6: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 7: Boost current is the current flowing into the BOOST pin with the
pin held 3.3V above input voltage. It flows only during switch on time.
Note 8: Gain is measured with a V
Note 9: Switch on resistance is calculated by dividing V
the forced current (3A). See Typical Performance Characteristics for the
graph of switch voltage at other currents.
Note 10: The C
the C
See the Soft-Start section in Applications Information.
Note 11: The PGFB threshold is defined as the percentage of V
which causes the current source output of the C
sinking (below threshold) to sourcing current (above threshold). When
sourcing current, the voltage on the C
internally. When the clamp is activated, the output of the PG pin will be set
to a high impedance state. When the C
be set active low with a current sink capability of 200µA.
SS
pin which results in an increase in sink current from the V
SS
threshold is defined as the value of current sourced into
●
●
●
●
C
swing from 1.15V to 750mV.
MIN
1.16
180
230
120
2.1
T
90
88
3
7
2
1
T
pin rises until it is clamped
clamp is inactive the PG pin will
TYP
200
500
200
T
2.2
4.7
0.1
1.5
3.6
1.2
0.1
92
45
13
25
90
2
pin to change from
IN
LT3434
to SW voltage by
MAX
0.25
1.26
230
100
2.4
6.5
2.0
5.5
20
92
1
REF
C
voltage
pin.
UNITS
BIAS
3434fb
3
kHz
kHz
mA
kΩ
µA
nA
µA
µA
µA
%
%
Ω
is
V
A
V
V