LTC3784_15 Datasheet, PDF (3/38 Pages) Linear Technology – 60V PolyPhase Synchronous Boost Controller

LTC3784
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
SYMBOL
PARAMETER
Main Control Loop
VBIAS
Chip Bias Voltage Operating Range
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage V_IN)
V_FB
Regulated Feedback Voltage
Feedback Current
Reference Line Voltage Regulation
Output Voltage Load Regulation
(Note 4)
Error Amplifier Transconductance
I_Q
Input DC Supply Current
Pulse-Skipping or Forced Continuous Mode
Sleep Mode
Shutdown
SW Pin Current
UVLO
INTV_CC Undervoltage Lockout Thresholds
V_RUN
V_{SENSE1,2(MAX)}
RUN Pin ON Threshold
RUN Pin Hysteresis
RUN Pin Hysteresis Current
RUN Pin Current
Soft-Start Charge Current
Maximum Current Sense Threshold
t_ON(MIN)
Matching Between V_SENSE1(MAX) and
V_SENSE2(MAX)
SENSE⁺ Pin Current
SENSE^– Pin Current
Top Gate Rise Time
Top Gate Fall Time
Bottom Gate Rise Time
Bottom Gate Fall Time
Top Gate Pull-Up Resistance
Top Gate Pull-Down Resistance
Bottom Gate Pull-Up Resistance
Bottom Gate Pull-Down Resistance
Top Gate Off to Bottom Gate On Switch-On
Delay Time
Bottom Gate Off to Top Gate On Switch-On
Delay Time
Maximum BG Duty Factor
Minimum BG On-Time
CONDITIONS
I_TH = 1.2V (Note 4)
(Note 4)
VBIAS = 6V to 60V
Measured in Servo Loop;
ΔI_TH Voltage = 1.2V to 0.7V
Measured in Servo Loop;
ΔI_TH Voltage = 1.2V to 2V
I_TH = 1.2V
(Note 5)
RUN = 5V; V_FB = 1.25V (No Load)
RUN = 5V; V_FB = 1.25V (No Load)
RUN = 0V
V_SW1,2 = 12V; V_BOOST1,2 = 4.5V;
FREQ = 0V, Forced Continuous or
Pulse-Skipping Mode
V_INTVCC Ramping Up
V_INTVCC Ramping Down
V_RUN Rising
V_RUN > 1.28V
V_RUN < 1.28V
V_SS = GND
V_FB = 1.1V, I_LIM = INTV_CC
V_FB = 1.1V, I_LIM = Float
V_FB = 1.1V, I_LIM = GND
V_FB = 1.1V, I_LIM = INTV_CC
V_FB = 1.1V, I_LIM = Float
V_FB = 1.1V, I_LIM = GND
V_FB = 1.1V, I_LIM = Float
V_FB = 1.1V, I_LIM = Float
C_LOAD = 3300pF (Note 6)
C_LOAD = 3300pF (Note 6)
C_LOAD = 3300pF (Note 6)
C_LOAD = 3300pF (Note 6)
C_LOAD = 3300pF (Each Driver)
C_LOAD = 3300pF (Each Driver)
(Note 7)
MIN TYP MAX UNITS
4.5
60
V
2.3
60
V
l 1.188 1.200 1.212
V
±5
±50
nA
0.002 0.02
%/V
l
0.01
0.1
%
l
–0.01 –0.1
%
2
mmho
0.9
mA
28
45
µA
4
10
µA
700
µA
l
4.1
4.3
V
l 3.6
3.8
V
l 1.18 1.28 1.38
V
100
mV
4.5
µA
0.5
µA
7
10
13
µA
l 90
100
110
mV
l 68
75
82
mV
l 42
50
56
mV
l –12
0
12
mV
l –10
0
10
mV
l –9
0
9
mV
200
300
µA
±1
µA
20
ns
20
ns
20
ns
20
ns
1.2
Ω
1.2
Ω
1.2
Ω
1.2
Ω
30
ns
30
ns
96
%
110
ns
3784fb
For more information www.linear.com/LTC3784
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