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| LTC3867_15 Datasheet, PDF (4/36 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller | |||
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LTC3867
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN = 5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VPG1(HYST) PGOOD Trip Level Hysteresis
2
%
VPG2
PGOOD 2nd Trip LevelâNo Delay
VFB with Respect to Set Output Voltage
VFB Ramping Up
VFB Ramping Down
17
%
â25
%
VPG2(HYST) PGOOD 2nd Trip Level Hysteresis
5
%
INTVCC Linear Regulator
VINTVCC
Linear Regulator Voltage
6V < VIN < 38V
5.1
5.3
5.5
V
VLDO INT
INTVCC Load Regulation
ICC = 0mA to 20mA
0.5
2
%
VEXTVCC
EXTVCC Switchover Voltage
EXTVCC Ramping Positive
4.5
4.7
V
VLDO EXT
EXTVCC Voltage Drop
ICC = 20mA, VEXTVCC = 5V
50
70
mV
VLDO(HYS)
EXTVCC Hysteresis
200
mV
Differential Amplifier
VDA
IDIFF+
DIFF+ Accuracy
Input Bias Current
Measured in a Servo Loop with EA in Loop
ITH =1.2V, 0°C to 85°C
ITH =1.2V, â40°C to 125°C
595.5
600
604.5
mV
l 594
600
606
mV
DIFF+ to SGND
â200
200
nA
f0dB
DA Unity-Gain Crossover Frequency
(Note 7)
4
MHz
IOUT(SINK)
Maximum Sinking Current
DIFFOUT = 600mV
100
µA
IOUT(SOURCE) Maximum Sourcing Current
DIFFOUT = 600mV
500
µA
Oscillator and Phase-Locked Loop
fOSC
Oscillator Frequency
RFREQ < 23.2kΩ
RFREQ = 30.1kΩ
RFREQ = 47.5kΩ
RFREQ = 54.9kΩ
RFREQ = 75.0kΩ
Maximum Frequency
Minimum Frequency
150
kHz
250
kHz
600
kHz
750
kHz
1.05
MHz
1.2
MHz
0.2
MHz
IFREQ
FREQ Pin Output Current
RMODE/PLLIN MODE/PLLIN Input Resistance
On-Chip Driver
VFREQ = 0.8V
19
20
21
µA
250
kΩ
TG RUP
TG RDOWN
BG RUP
BG RDOWN
TG Pull-Up RDS(ON)
TG Pull-Down RDS(ON)
BG Pull-Up RDS(ON)
BG Pull-Down RDS(ON)
TG High
TG Low
BG High
BG Low
2.6
Ω
1.5
Ω
2.4
Ω
1.1
Ω
3867f
4
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