LTC1439 查看數據表（PDF） - Linear Technology
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LTC1439 Datasheet PDF : 32 Pages
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LTC1438/LTC1439
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range. TA = 25°C, VIN = 15V, VRUN/SS1,2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
Main Control Loops
IIN VOSENSE1,2
VOUT1,2
Feedback Current
Regulated Output Voltage
1.19V (Adjustable) Selected
3.3V Selected
5V Selected
VLINEREG1,2 Reference Voltage Line Regulation
VLOADREG1,2 Output Voltage Load Regulation
VSFB1
ISFB1
VOVL
IPROG1,2
Secondary Feedback Threshold
Secondary Feedback Current
Output Overvoltage Lockout
VPROG1,2 Input Current
IQ
Input DC Supply Current
Normal Mode
Shutdown
VRUN/SS1,2
IRUN/SS1,2
∆VSENSE(MAX)
TGL1, 2 tr, t f
Run Pin Threshold
Soft Start Current Source
Maximum Current Sense Threshold
TGL1, TGL2 Transition Time
Rise Time
Fall Time
TGS1, 2 tr, tf TGS1, TGS2 Transition Time
Rise Time
Fall Time
BG1, 2 tr, tf
BG1, BG2 Transition Time
Rise Time
Fall Time
Internal VCC Regulator
VINTVCC
Internal VCC Voltage
VLDO INT
INTVCC Load Regulation
VLDO EXT
EXTVCC Voltage Drop
VEXTVCC
EXTVCC Switchover Voltage
Oscillator and Phase-Locked Loop
fOSC
Oscillator Frequency
VCO High
RPLLIN
IPLLLPF
PLLIN Input Resistance
Phase Detector Output Current
Sinking Capability
Sourcing Capability
Power-On Reset
VSATPOR2
POR2 Saturation Voltage
ILPOR2
VTHPOR2
POR2 Leakage
POR2 Trip Voltage
tDPOR2
POR2 Delay
CONDITIONS
MIN TYP MAX UNITS
VPROG1, VPROG2 Pins Open (Note 3)
10
50
nA
(Note 3)
VPROG1, VPROG2 Pins Open
VPROG1, VPROG2 = 0V
VPROG1, VPROG2 = INT VCC
● 1.178 1.19 1.202
V
● 3.220 3.30 3.380
V
● 4.900 5.00 5.100
V
VIN = 3.6V to 20V (Note 3), VPROG1,2 Pins Open
0.002 0.01
%/V
ITH1,2 Sinking 5µA (Note 3)
ITH1,2 Sourcing 5µA
●
0.5
0.8
%
●
– 0.5 – 0.8
%
VSFB1 Ramping Negative
● 1.16 1.19 1.22
V
VSFB1 = 1.5V
VPROG1,2, SENSE – 1 and VOSENSE1,2 Pins Open
–1
–2
µA
1.24 1.28 1.32
V
0.5V > VPROG1,2
INTVCC – 0.5V < VPROG1,2 < INTVCC
–3
–6
µA
3
6
µA
EXTVCC = 5V (Note 4)
3.6V < VIN < 30V, VAUXON = 0V
VRUN/SS1,2 = 0V, 3.6V < VIN < 15V
320
µA
16
30
µA
● 0.8
1.3
2
V
VRUN/SS1,2 = 0V
1.5
3
4.5
µA
VOSENSE1,2 = 0V, 5V VPROG1,2 = Pins Open
130 150 180
mV
CLOAD = 3000pF
CLOAD = 3000pF
50
150
ns
50
150
ns
CLOAD = 500pF
CLOAD = 500pF
100 200
ns
50
150
ns
CLOAD = 3000pF
CLOAD = 3000pF
50
150
ns
50
150
ns
6V < VIN < 30V, VEXTVCC = 4V
IINTVCC = 20mA, VEXTVCC = 4V
IINTVCC = 20mA, VEXTVCC = 5V
IINTVCC = 20mA, EXTVCC Ramping Positive
● 4.8
5.0
5.2
V
– 0.2
–1
%
170 300
mV
● 4.5
4.7
V
COSC = 100pF, LTC1439: PLL LPF = 0V (Note 5)
LTC1439, VPLLLPF = 2.4V
LTC1439
fPLLIN < fOSC
fPLLIN > fOSC
112 125 138
kHz
200 240
kHz
50
kΩ
10
15
20
µA
10
15
20
µA
IPOR2 = 1.6mA, VOSENSE2 = 1V,
VPROG2 Pin Open
VPOR2 = 12V, VOSENSE2 = 1.2V, VPROG2 Pin Open
VPROG2 Pin Open % of VREF
VOSENSE2 Ramping Negative
VPROG2 Pin Open
0.6
0.2
– 11 – 7.5
65536
1
V
1
µA
–4
%
Cycles
14389fb
3
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