參數(shù)資料
型號： LTC4267CGN-1
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁數(shù)： 23/32頁
文件大小： 925K
代理商： LTC4267CGN-1
LTC4267-1
3
42671f
The
● denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VCLAMP1mA
PVCC Shunt Regulator Voltage
IPVCC = 1mA, VITH/RUN = 0V, Voltage
●
8.3
9.4
10.3
V
with Respect to PGND
VMARGIN
VCLAMP1mA – VTURNON Margin
●
0.05
0.6
V
IVPORTN_ON
VPORTN Supply Current when ON
VPORTN = –48V, POUT, PWRGD, SIGDISA Floating
●
3
mA
IPVCC_ON
PVCC Supply Current
(Note 7)
Normal Operation
VITH/RUN – PGND = 1.3V
●
240
350
μA
Start-Up
PVCC – PGND = VTURNON – 100mV
●
40
90
μA
IVPORTN_CLASS VPORTN Supply Current
VPORTN = –17.5V, POUT Tied to VPORTP, RCLASS,
●
0.35
0.5
0.65
mA
During Classication
SIGDISA Floating (Note 8)
ΔICLASS
Current Accuracy
10mA < ICLASS < 40mA, –12.5V ≤ VPORTN ≤ –21V
●
±3.5
%
During Classication
(Note 9)
RSIGNATURE
Signature Resistance
–1.5V ≤ VPORTN ≤ – 9.5V, POUT Tied to VPORTP,
●
23.25
26.00
k
Ω
IEEE 802.3af 2-Point Measurement (Notes 4, 5)
RINVALID
Invalid Signature Resistance
–1.5V ≤ VPORTN ≤ – 9.5V, SIGDISA and POUT Tied to
●
9
11.8
k
Ω
VPORTP, IEEE 802.3af 2-Point Measurement
(Notes 4, 5)
VIH
Signature Disable
With Respect to VPORTN
●
3
57
V
High Level Input Voltage
High Level Invalidates Signature (Note 10)
VIL
Signature Disable
With Respect to VPORTN
●
0.45
V
Low Level Input Voltage
Low Level Enables Signature
RINPUT
Signature Disable, Input Resistance
With Respect to VPORTN
●
100
k
Ω
VPG_OUT
Power Good Output Low Voltage
I = 1mA VPORTN = –48V,
●
0.5
V
PWRGD Referenced to V
PORTN
Power Good Trip Point
VPORTN = –48V, Voltage between VPORTN and POUT
VPG _FALL
POUT Falling
●
1.3
1.5
1.7
V
VPG_RISE
POUT Rising
●
2.7
3.0
3.3
V
IPG_LEAK
Power Good Leakage Current
VPORTN = 0V, PWRGD FET Off, VPWRGD = 57V
●
1
μA
RON
On-Resistance
I = 300mA, VPORTN = –48V, Measured from
1.0
1.6
Ω
VPORTN to POUT
●
2
Ω
VITHSHDN
Shutdown Threshold (at ITH/RUN)
PVCC – PGND = VTURNON + 100mV
●
0.15
0.28
0.45
V
ITHSTART
Start-Up Current Source at ITH/RUN
VITH/RUN – PGND = 0V, PVCC – PGND = 8V
0.2
0.3
0.4
μA
VFB
Regulated Feedback Voltage
Referenced to PGND, PVCC – PGND = 8V (Note 11)
●
0.780
0.800
0.812
V
IFB
VFB Input Current
PVCC – PGND = 8V (Note 11)
10
50
nA
gm
Error Amplier Transconductance
ITH/RUN Pin Load = ±5μA (Note 11)
200
333
500
μA/V
ΔVO(LINE)
Output Voltage Line Regulation
VTURNOFF < PVCC < VCLAMP (Note 11)
0.05
mV/V
ΔVO(LOAD)
Output Voltage Load Regulation
ITH/RUN Sinking 5μA, PVCC – PGND = 8V (Note 11)
3
mV/μA
ITH/RUN Sourcing 5μA, PVCC – PGND = 8V (Note 11)
3
mV/μA
IPOUT_LEAK
POUT Leakage
VPORTN = 0V, Power MOSFET Off,
●
150
μA
POUT = 57V (Note 12)
ILIM_HI
Input Current Limit, High Level
VPORTN = –48V, POUT = –43V (Note 13, 14)
●
350
450
mA
ILIM_LO
Input Current Limit, Low Level
VPORTN = –48V, POUT = –43V (Note 13, 14)
●
90
205
mA
fOSC
Oscillator Frequency
VITH/RUN – PGND = 1.3V, PVCC – PGND = 8V
180
200
240
kHz
DCON(MIN)
Minimum Switch On Duty Cycle
VITH/RUN – PGND = 1.3V, VFB – PGND = 0.8V,
6
8
%
PVCC – PGND = 8V
DCON(MAX)
Maximum Switch On Duty Cycle
VITH/RUN – PGND = 1.3V, VFB – PGND = 0.8V,
70
80
90
%
PVCC – PGND = 8V
ELECTRICAL CHARACTERISTICS
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