LTC1875 Просмотр технического описания (PDF) - Linear Technology
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LTC1875 Datasheet PDF : 20 Pages
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LTC1875
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage .................................. – 0.3V to 7V
ITH, PLL_LPF Voltages ............................. – 0.3V to 2.7V
RUN/SS, VFB Voltages ............................... – 0.3V to VIN
SYNC/MODE Voltage ................................. – 0.3V to VIN
(VPVIN – VSWP) Voltage ............................... – 0.3V to 7V
VSWN Voltage .............................................. – 0.3V to 7V
P-Channel Switch Source Current (DC) .................... 2A
N-Channel Switch Sink Current (DC) ........................ 2A
Peak Switching Sink and Source Current ................. 3A
Operating Ambient Temperature Range
(Note 2) ............................................. – 40°C to 85°C
Junction Temperature (Note 3, 6) ........................ 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SGND 1
RUN/SS 2
VFB 3
ITH 4
SWP1 5
SWN1 6
PGND1 7
PVIN1 8
16 PLL_LPF
15 SYNC/MODE
14 PGOOD
13 SVIN
12 SWP2
11 SWN2
10 PGND2
9 PVIN2
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/ W, θJC = 40°C/ W
ORDER PART
NUMBER
LTC1875EGN
GN PART
MARKING
1875
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 3.6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IVFB
Feedback Current
(Note 4)
q
VFB
Regulated Output Voltage
(Note 4) 0°C ≤ TA ≤ 85°C
(Note 4) – 40°C ≤ TA ≤ 85°C
q
∆VOVL
Overvoltage Trip Limit with Respect to VFB ∆VOVL = VOVL – VFB
q
∆VUVL
Undervoltage Trip Limit with Respect to VFB ∆VUVL = VFB – VUVL
q
∆VFB/VFB Reference Voltage Line Regulation
VIN = 2.65V to 6V (Note 4)
VLOADREG Output Voltage Load Regulation
Measured in Servo Loop, VITH = 0.9V to 1.2V q
Measured in Servo Loop, VITH = 1.6V to 1.2V q
VIN
Input Voltage Range
q
IQ
Input DC Bias Current
Pulse Skipping Mode
Burst Mode Operation
Shutdown
(Note 5)
2.65V < VIN < 6V, VSYNC/MODE = 0V, IOUT = 0A
VSYNC/MODE = VIN, IOUT = 0A
VRUN = 0V, VIN = 6V
fSYNC
SYNC Capture Range
fOSC
Oscillator Frequency
VFB ≥ 0.7V
VFB = 0V
IPLLLPF
Phase Detector Output Current
Sinking Capability
fPLLIN < fOSC
q
Sourcing Capability
fPPLIN > fSOC
q
RPFET
RDS(ON) of P-Channel FET
ISW = 100mA, VIN = 5V
RNFET
RDS(ON) of N-Channel FET
ISW = – 100mA, VIN = 5V
IPK
Peak Inductor Current
VFB = 0.7V, Duty Cycle < 35%, VIN = 3V
ILSW
SW Leakage
VRUN = 0V, VSW = 0V or 6V, VIN = 6V
VSYNC/MODE SYNC/MODE Threshold
q
ISYNC/MODE SYNC/MODE Leakage Current
0.784
0.740
20
20
2.65
350
495
3
–3
1.6
0.2
8
0.80
0.80
60
60
0.05
0.1
– 0.1
270
15
0
550
80
10
– 10
0.28
0.35
2.15
± 0.01
1.0
± 0.01
60
0.816
0.840
110
110
0.25
0.6
– 0.6
6
365
22
1
750
605
20
– 20
0.35
0.4
2.75
±2.5
1.5
±1
2
UNITS
nA
V
V
mV
mV
%/V
%
%
V
µA
µA
µA
kHz
kHz
kHz
µA
µA
Ω
Ω
A
µA
V
µA
1875f
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