LTC3773 Datasheet, PDF (3/32 Pages) Linear Technology – Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

LTC3773
ELECTRICAL CHARACTERISTICS (Note 3) The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T_A = 25°C. V_CC = V_DR = V_BOOST = V_SDB = 5V, unless otherwise noted.
SYMBOL
PARAMETER
Main Control Loop
V_FB
Feedback Voltage
I_VFB
V_SENSEMAX
Feedback Pin Input Current
Maximum Current Sense Threshold
V_FBLOADREG
Feedback Voltage Load Regulation
V_FBLNREG
g_m
f_u
A_ERR
V_UVR
V_CC
I_VCC
I_VDR
I_BOOST
I_SDB
V_SDB
I_SENSE
DF_MAX
TG R_UP
TG R_DOWN
BG R_UP
BG R_DOWN
TG/BG t_1D
BG/TG t_2D
t_ON(MIN)
Tracking
I_TRACK
V_FBTRACK
Feedback Voltage Line Regulation
Transconductance Amplifier g_m
Transconductance Amplifier GBW
Transconductance Amplifier DC Gain
V_CC Undervoltage Reset
Undervoltage Hysteresis
V_CC Supply Voltage
V_CC Supply Current
Normal Mode
Shutdown
V_DR Supply Current
Normal Mode
Shutdown
V_BOOST Supply Current
Normal Mode
Shutdown
SDB Source Current
SDB1, SDB2, SDB3 Source Content
SDB Power Up Threshold
SDB1 Pin CH1 ON Threshold
SDB2 Pin CH2 ON Threshold
SDB3 Pin CH3 ON Threshold
Channel On Threshold Hysteresis
SENSE Pins Source Current
Maximum Duty Factor
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
Top Gate OFF to Bottom Gate ON Delay
Synchronous Switch-On Delay Time
Bottom Gate OFF to Top Gate ON Delay
Top Switch-On Delay Time
Minimum On-Time
TRACK Pin Pull-Up Current
V_FB Voltage During Tracking
CONDITIONS
V_ITH = 1.2V, 0°C ≤ T ≤ 85°C (Note 4)
●
0 ≤ V_FB ≤ 1V
V_FB = 0.55V, V_TRACK = 1V, V_SENSE– = 2.5V
●
Measured in Servo Loop (Note 4)
Δ_ITH Voltage = 1.2V to 0.7V
●
Δ_ITH Voltage = 1.2V to 2V
●
V_CC = 4.5V to 6V
V_ITH = 1.2V, Sink/Source 25μA (Note 4)
●
V_ITH = 1.2V (Note 5)
V_ITH = 0.8V to 1.6V
●
V_CC Ramping Positive
●
V_CC = 5V
V_SDB = 0V
V_DR = 5V (Note 6)
V_SDB = 0V
V_BOOST = 5V, V_SW = 0V (Note 6)
V_SDB = 0V
Ramping Positive
●
●
●
●
V_SENSE+, V_SENSE– = 1.2V, Current at Each Pin
PLLFLTR Floats, In Dropout
TG High, I_OUT = 100mA (Note 7)
TG Low, I_OUT = 100mA (Note 7)
BG High, I_OUT = 100mA (Note 7)
BG Low, I_OUT = 100mA (Note 7)
All Controllers
All Controllers
Tested with a Square Wave (Note 8)
V_SDB = 5V, V_TRACK = 0V
V_TRACK = 0.2V, V_ITH = 1.2V (Note 4)
V_TRACK = 0.4V, V_ITH = 1.2V (Note 4)
MIN
0.594
0.591
65
60
2.3
50
3.7
4.5
0.4
1.14
1.71
2.3
97
180
380
TYP
0.600
0.600
– 15
75
75
0.15
–0.2
0.01
2.7
3
56
4.1
0.16
5
2.8
20
5
1
1
1
– 1.5
–0.5
1.2
1.8
2.4
– 10
–13
98.5
2.2
1.8
2.4
0.9
50
50
130
–1
200
400
MAX UNITS
0.606
V
0.609
V
– 100
nA
85
mV
90
mV
0.5
%
–0.5
%
%/V
3.2 mmho
MHz
dB
4.4
V
V
6
V
4
mA
30
μA
mA
μA
mA
μA
μA
μA
V
1.26
V
1.89
V
2.5
V
%
–20
μA
%
Ω
Ω
Ω
Ω
ns
ns
ns
μA
220
mV
420
mV
3773fb
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