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LTC3869 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC3869
Description  Dual, Fast, Accurate Step-Down DC/DC Controller
Download  54 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3869 Datasheet(HTML) 4 Page - Linear Technology

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LTC3838
4
3838fa
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted (Note 3).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Current Sensing
VSENSE(MAX)1,2
Maximum Valley Current Sense Threshold
(VSENSE1,2+ – VSENSE1,2–)
VRNG = 2V, VFB = 0.57V, VSENSE– = 2.5V
VRNG = 0V, VFB = 0.57V, VSENSE– = 2.5V
VRNG = INTVCC, VFB = 0.57V, VSENSE– = 2.5V
l
l
l
80
21
39
100
30
50
120
40
61
mV
mV
mV
VSENSE(MIN)1,2
Minimum Valley Current Sense Threshold
(VSENSE1,2+ – VSENSE1,2–)
(Forced Continuous Mode)
VRNG = 2V, VFB = 0.63V, VSENSE– = 2.5V
VRNG = 0V, VFB = 0.63V, VSENSE– = 2.5V
VRNG = INTVCC, VFB = 0.63V, VSENSE– = 2.5V
–50
–15
–25
mV
mV
mV
ISENSE1,2+
SENSE1,2+ Pins Input Bias Current
VSENSE+ = 0.6V
VSENSE+ = 5V
±5
1
±50
±2
nA
μA
ISENSE1,2–
SENSE1,2Pins Input Bias Current
(Internal 500k Resistor to SGND)
VSENSE– = 0.6V
VSENSE– = 5V
1.2
10
μA
μA
Start-Up and Shutdown
VRUN1,2
RUN Pin On Threshold
VRUN1,2 Rising
l
1.1
1.2
1.3
V
RUN Pin On Hysteresis
VRUN1,2 Falling from On Threshold
100
mV
IRUN1,2
RUN Pin Pull-Up Current when Off
RUN1,2 = SGND
1.2
μA
RUN Pin Pull-Up Current Hysteresis
IRUN1,2(HYS) = IRUN1,2(ON) – IRUN1,2(OFF)
5μA
UVLO
INTVCC Undervoltage Lockout
INTVCC Falling
INTVCC Rising
l
l
3.3
3.7
4.2
4.5
V
V
ITRACK/SS1,2
Soft-Start Pull-Up Current
0V < TRACK/SS1,2 < 0.6V
1
μA
Frequency and Clock Synchronization
Clock Output Frequency
(Steady-State Switching Frequency)
RT = 205k
RT = 80.6k
RT = 18.2k
450
200
500
2000
550
kHz
kHz
kHz
Channel 2 Phase (Relative to Channel 1)
PHASMD = SGND
PHASMD = Floating
PHASMD = INTVCC
180
180
240
Deg
Deg
Deg
CLKOUT Phase (Relative to Channel 1)
PHASMD = SGND
PHASMD = Floating
PHASMD = INTVCC
60
90
120
Deg
Deg
Deg
VPLLIN(H)
Clock Input High Level Into MODE/PLLIN
2
V
VPLLIN(L)
Clock Input Low Level Into MODE/PLLIN
0.5
V
RMODE/PLLIN
MODE/PLLIN Input DC Resistance
With Respect to SGND
600
Gate Drivers
RTG(UP)1,2
TG Driver Pull-Up On Resistance
TG High
2.5
Ω
RTG(DOWN)1,2
TG Driver Pull-Down On Resistance
TG Low
1.2
Ω
RBG(UP)1,2
BG Driver Pull-Up On Resistance
BG High
2.5
Ω
RBG(DOWN)1,2
BG Driver Pull-Down On Resistance
BG Low
0.8
Ω
tD(TG/BG)1,2
Top Gate Off to Bottom Gate On Delay Time (Note 6)
20
ns
tD(BG/TG)1,2
Bottom Gate Off to Top Gate On Delay Time (Note 6)
15
ns


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