LT3437IFE#TRPBF Linear Technology, LT3437IFE#TRPBF Datasheet - Page 4

• 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: -

LT3437
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
otherwise noted.
I
I
I
V
I
I
SW V
I
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 LT3437EDD/LT3437EFE are 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
LT3437IDD/LT3437IFE are guaranteed and tested over the full –40°C to
125°C operating junction temperature range. The LT3437HFE is also tested
to the LT3437 Electrical Characteristics table at 140°C operating junction
temperature. High junction temperatures degrade operating lifetimes.
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 LT3437. With the BIAS pin at 0V, all of the quiescent current
required to operate the LT3437 will be provided by the V
4
VIN
BIASS
BIAS
FB
PK
CSS
REF
CESAT
Supply Quiescent Current
Minimum BIAS Voltage (Note 5)
BIAS Sleep Current (Note 4)
BIAS Quiescent Current
Minimum Boost Voltage (Note 6)
Input Boost Current (Note 7)
Reference Voltage (V
FB Input Bias Current
EA Voltage Gain (Note 8)
EA Voltage g
EA Source Current
EA Sink Current
V
V
V
SW Current Limit
Switch Saturation Voltage
(Note 9)
Switching Frequency
Maximum Duty Cycle
Minimum SYNC Amplitude
SYNC Frequency Range
SYNC Input Impedance
C
C
C
C
SS
to SW g
Switching Threshold
High Clamp
Current Threshold (Note 10)
m
m
REF
)
IN
pin. With the
BIAS = 0V, FB = 1.15V, V
BIAS = 5V, FB = 1.15V, V
SYNC = 2V
I
I
I
3.3V < V
V
dI(V
FB = 1.15V
FB = 1.35V
V
I
I
FB = 0V
SW
SW
SW
SW
SW
J
VIN
SYNC
= 25°C. V
= 500mA
= 0.5A
= 0.25A
C
= 250mA
= 500mA
= 80V
)= ±10µA
= 2V
The
VIN
●
< 60V
IN
denotes the specifications which apply over the –40°C to 140°C
= 12V, SHDN = 12V, BIAS = 5V, FB = 1.25V, C
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.
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 saturation voltage guaranteed by correlation to wafer level
measurements for DD package parts.
Note 10: The C
C
Soft-Start section in Applications Information.
SS
C
C
pin which results in an increase in sink current from the V
= 0.8V, SYNC = 2V
= 0.8V, SYNC = 2V
SS
threshold is defined as the value of current sourced into the
●
●
●
●
●
●
●
C
swing from 1.15V to 750mV.
1.212
1.190
400
140
240
1.5
15
15
4
0.475
1.35
0.75
1.25
1.25
1.75
110
900
650
500
650
200
400
200
SS
2.7
1.8
1.5
11
50
35
30
95
50
10
8
1
/SYNC = 0V unless
1.288
1.288
3.15
180
200
900
400
800
240
500
2.5
2.1
16
13
55
55
16
2
1
1
2
C
pin. See the
BIAS
µMho
3437fc
A/V
V/V
kHz
kHz
mA
mA
mA
mA
mA
mV
mA
mV
mV
kΩ
µA
nA
µA
µA
µA
%
is
V
V
V
V
V
V