Datasheet

LTC3788-1
3
37881fc
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 PARAMETER CONDITIONS MIN TYP MAX UNITS
V
LOADREG
Output Voltage Load Regulation (Note 4)
Measured in Servo Loop;
∆I
TH
Voltage = 1.2V to 0.7V
l
0.01 0.1 %
Measured in Servo Loop;
∆I
TH
Voltage = 1.2V to 2V
l
–0.01 –0.1 %
g
m1,2
Error Amplifier Transconductance I
TH
= 1.2V 2 mmho
I
Q
Input DC Supply Current (Note 5)
Pulse-Skipping or Forced Continuous Mode
(One Channel On)
RUN1 = 5V and RUN2 = 0V or RUN1 = 0V
and RUN2 = 5V; V
FB1(2)
= 1.25V (No Load)
0.9 mA
Pulse-Skipping or Forced Continuous Mode
(Both Channels On)
RUN1,2 = 5V; V
FB1,2
= 1.25V (No Load) 1.2 mA
Sleep Mode
(One Channel On)
RUN1 = 5V and RUN2 = 0V or RUN1 = 0V
and RUN2 = 5V; V
FB1(2)
= 1.25V (No Load)
125 190 µA
Sleep Mode
(Both Channels On)
RUN1,2 = 5V; V
FB1,2
= 1.25V (No Load) 200 300 µA
Shutdown RUN1,2 = 0V 8 20 µA
UVLO INTV
CC
Undervoltage Lockout Thresholds V
INTVCC
Ramping Up
l
4.1 4.3 V
V
INTVCC
Ramping Down
l
3.6 3.8 V
V
RUN1,2
RUN Pin On Threshold V
RUN
Rising
l
1.18 1.28 1.38 V
V
RUNHYS
RUN Pin Hysteresis 100 mV
I
RUN1,2
RUN Pin Hysteresis Current V
RUN
> 1.28V 4.5 µA
I
RUN1,2
RUN Pin Current V
RUN
< 1.28V 0.5 µA
I
SS1,2
Soft-Start Charge Current V
SS
= GND 10 µA
V
SENSE(MAX)
Maximum Current Sense Threshold V
FB
= 1.1V
l
68 75 82 mV
V
SENSE(CM)
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage V
IN
)
2.5 38 V
I
SENSE1,2
+
SENSE
+
Pin Current V
FB
= 1.1V 200 300 µA
I
SENSE1,2
–
SENSE
–
Pin Current V
FB
= 1.1V ±1 µA
t
r(TG1,2)
Top Gate Rise Time C
LOAD
= 3300pF (Note 6) 20 ns
t
f(TG1,2)
Top Gate Fall Time C
LOAD
= 3300pF (Note 6) 20 ns
t
r(BG1,2)
Bottom Gate Rise Time C
LOAD
= 3300pF (Note 6) 20 ns
t
f(BG1,2)
Bottom Gate Fall Time C
LOAD
= 3300pF (Note 6) 20 ns
R
UP(TG1,2)
Top Gate Pull-Up Resistance 1.2 
R
DN(TG1,2)
Top Gate Pull-Down Resistance 1.2 
R
UP(TG1,2)
Bottom Gate Pull-Up Resistance 1.2 
R
DN(TG1,2)
Bottom Gate Pull-Down Resistance 1.2 
t
D(TG/BG)
Top Gate Off to Bottom Gate On
Switch-On Delay Time
C
LOAD
= 3300pF (Each Driver) 70 ns
t
D(BG/TG)
Bottom Gate Off to Top Gate On
Switch-On Delay Time
C
LOAD
= 3300pF (Each Driver) 70 ns
DF
MAX(BG1,2)
Maximum BG Duty Factor 96 %
t
ON(MIN)
Minimum BG On-Time (Note 7) 110 ns