LT3437 查看數據表（PDF） - Linear Technology
零件编号
产品描述 (功能)
生产厂家
LT3437
Linear Technology
LT3437 Datasheet PDF : 28 Pages
| |||
LT3437
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the –40°C to 140°C
temperature range, otherwise specifications are at TJ = 25°C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB = 1.25V, CSS/SYNC = 0V unless
otherwise noted.
IVIN
Supply Quiescent Current
BIAS = 0V, FB = 1.15V, VC = 0.8V, SYNC = 2V
BIAS = 5V, FB = 1.15V, VC = 0.8V, SYNC = 2V
Minimum BIAS Voltage (Note 5)
1.35
2
mA
0.475
1
mA
2.7 3.15
V
IBIASS
IBIAS
VREF
IFB
IPK
SW VCESAT
ICSS
BIAS Sleep Current (Note 4)
BIAS Quiescent Current
Minimum Boost Voltage (Note 6)
Input Boost Current (Note 7)
Reference Voltage (VREF)
FB Input Bias Current
EA Voltage Gain (Note 8)
EA Voltage gm
EA Source Current
EA Sink Current
VC to SW gm
VC Switching Threshold
VC High Clamp
SW Current Limit
Switch Saturation Voltage
(Note 9)
Switching Frequency
Maximum Duty Cycle
Minimum SYNC Amplitude
SYNC Frequency Range
SYNC Input Impedance
CSS Current Threshold (Note 10)
SYNC = 2V
ISW = 500mA
ISW = 0.5A
ISW = 0.25A
3.3V < VVIN < 60V
VVIN = 80V
dI(VC)= ±10µA
FB = 1.15V
FB = 1.35V
VSYNC = 2V
ISW = 250mA
ISW = 500mA
FB = 0V
●
110
180
µA
0.75
1
mA
1.8
2.5
V
11
16
mA
8
13
mA
● 1.212 1.25 1.288
V
● 1.190 1.25 1.288
V
50
200
nA
900
V/V
650
µMho
15
35
55
µA
15
30
55
µA
1
A/ V
500
mV
1.5
1.75
2.1
V
● 400
650
900
mA
●
200
400
mV
●
400
800
mV
● 140
200
240
kHz
95
%
1.5
2
V
240
500
kHz
50
kΩ
4
10
16
µA
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 VIN pin. With the
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 IBIAS is
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 VC swing from 1.15V to 750mV.
Note 9: Switch saturation voltage guaranteed by correlation to wafer level
measurements for DD package parts.
Note 10: The CSS threshold is defined as the value of current sourced into the
CSS pin which results in an increase in sink current from the VC pin. See the
Soft-Start section in Applications Information.
3437fc
4
Share Link: 