LTC3788_15 Datasheet, PDF (3/32 Pages) Linear Technology – 2-Phase, Dual Output Synchronous Boost Controller

LTC3788
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
SYMBOL
V_LOADREG
g_{m1, 2}
I_Q
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage Load Regulation
(Note 4)
Error Amplifier Transconductance
Input DC Supply Current
Measured in Servo Loop;
∆I_TH Voltage = 1.2V to 0.7V
Measured in Servo Loop;
∆I_TH Voltage = 1.2V to 2V
I_TH = 1.2V
(Note 5)
l
0.01
0.1
%
l
–0.01 –0.1
%
2
mmho
Pulse-Skipping or Forced Continuous Mode RUN1 = 5V and RUN2 = 0V or RUN1 = 0V
(One Channel On)
and RUN2 = 5V; V_FB1(2) = 1.25V (No Load)
Pulse-Skipping or Forced Continuous Mode RUN1,2 = 5V; V_FB1,2 = 1.25V (No Load)
(Both Channels On)
0.9
mA
1.2
mA
Sleep Mode
(One Channel On)
Sleep Mode
(Both Channels On)
RUN1 = 5V and RUN2 = 0V or RUN1 = 0V
and RUN2 = 5V; V_FB1(2) = 1.25V (No Load)
RUN1,2 = 5V; V_FB1,2 = 1.25V (No Load)
125
190
µA
200
300
µA
Shutdown
RUN1,2 = 0V
8
20
µA
UVLO
V_{RUN1, 2}
V_RUNHYS
I_{RUN1, 2}
I_{RUN1, 2}
I_{SS1, 2}
V_SENSE(MAX)
V_SENSE(CM)
I_{SENSE1, 2+}
I_{SENSE1, 2–}
t _{r (TG1, 2)}
t _f(TG1,2)
t _{r (BG1, 2)}
t _{f(BG1, 2)}
R_{UP(TG1, 2)}
R_{DN(TG1, 2)}
R_{UP(TG1, 2)}
R_{DN(TG1, 2)}
t _D(TG/BG)
t _D(BG/TG)
DF_{MAX(BG1, 2)}
INTV_CC Undervoltage Lockout Thresholds
RUN Pin On Threshold
RUN Pin Hysteresis
V_INTVCC Ramping Up
V_INTVCC Ramping Down
V_RUN Rising
RUN Pin Hysteresis Current
V_RUN > 1.28V
RUN Pin Current
V_RUN < 1.28V
Soft-Start Charge Current
V_SS = GND
Maximum Current Sense Threshold
V_FB = 1.1V, I_LIM = INTV_CC
V_FB = 1.1V, I_LIM = Float
V_FB = 1.1V, I_LIM = GND
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage V_IN)
SENSE⁺ Pin Current
V_FB = 1.1V, I_LIM = Float
SENSE^– Pin Current
V_FB = 1.1V, I_LIM = Float
Top Gate Rise Time
C_LOAD = 3300pF (Note 6)
Top Gate Fall Time
C_LOAD = 3300pF (Note 6)
Bottom Gate Rise Time
C_LOAD = 3300pF (Note 6)
Bottom Gate Fall Time
C_LOAD = 3300pF (Note 6)
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
C_LOAD = 3300pF (Each Driver)
Bottom Gate Off to Top Gate On
Switch-On Delay Time
C_LOAD = 3300pF (Each Driver)
Maximum BG Duty Factor
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
2.5
38
V
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
70
ns
70
ns
96
%
3788fc
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