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LTC3829 Datasheet, PDF (4/40 Pages) Linear Technology – 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp
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LTC3829
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN = 5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
TG1,2,3 tr
TG1,2,3 tf
BG1,2,3 tr
BG1,2,3 tf
TG/BG t1D
BG/TG t2D
TG Transition Time
Rise Time
Fall Time
BG Transition Time
Rise Time
Fall Time
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
(Note 6)
CLOAD = 3300pF
CLOAD = 3300pF
CLOAD = 3300pF Each Driver
Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver
Top Switch-On Delay Time
25
ns
25
ns
25
ns
25
ns
30
ns
30
ns
tON(MIN)
Minimum On-Time
INTVCC Linear Regulator
VINTVCC
Internal VCC Voltage
VLDO INT
INTVCC Load Regulation
VEXTVCC
EXTVCC Switchover Voltage
VLDO EXT EXTVCC Voltage Drop
VLDOHYS
EXTVCC Hysteresis
Oscillator and Phase-Locked Loop
(Note 7)
6V < VIN ≤ 38V
ICC = 0mA to 20mA
EXTVCC Ramping Positive
ICC = 20mA, VEXTVCC = 5V
4.8
l
4.5
90
ns
5.0
5.2
V
0.5
2.0
%
4.7
V
50
100
mV
200
mV
fNOM
fLOW
fHIGH
RPLLN
IFREQ
IISET
CLKOUT
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Frequency Setting Current
Shed and Burst Mode Program
Current
Phase (Relative to Controller 1)
VFREQ = 1.2V
VFREQ = 0V
VFREQ ≥ 2.4V
Non-Shedding Mode
Channel 2 and 3 Shedding
450
500
550
kHz
210
250
290
kHz
700
770
850
kHz
100
kΩ
9
10
11
µA
6.5
7.5
8.5
µA
60
Deg
180
Deg
CLKHIGH Clock High Output Voltage
4
5
V
CLKLOW Clock Low Output Voltage
0
0.2
V
PGOOD Output
VPGL
IPGOOD
VPG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
Differential Amplifier
IPGOOD = 2mA
VPGOOD = 5V
VFB with Respect to Set Output Voltage
VFB Ramping Negative
VFB Ramping Positive
0.1
0.3
V
0
±2
µA
–12
–10
–7
%
8
10
13
%
ADA
RIN
VOS
PSRR
ICL
VOUT(MAX)
GBW
Gain
Input Resistance
Input Offset Voltage
Power Supply Rejection Ratio
Maximum Output Current
Maximum Output Voltage
Gain-Bandwidth Product
Measured at DIFFP Input
VDIFFP = VDIFFOUT = 1.5V,
IDIFFOUT = 100µA
5V < VIN < 38V
INTVCC = 5V, IDIFFOUT = 300µA
(Note 8)
l 0.997
1
1.003
V/V
80
kΩ
2.5
mV
100
dB
3
mA
VINTVCC – 1.4 VINTVCC – 1.1
V
3
MHz
SR
Slew Rate
(Note 8)
2
V/µs
3829f

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