ltc3787gn Linear Technology Corporation, ltc3787gn Datasheet - Page 3

• Manufacturer Part Number: ltc3787gn
• Description: Ltc3787 - Polyphase Synchronous Boost Controller
• Manufacturer: Linear Technology Corporation

elecTrical characTerisTics
junction temperature range, otherwise specifications are at T
SYMBOL
Main Control Loop
VBIAS
V
I
V
V
g
I
UVLO
V
V
I
I
I
V
V
V
I
I
t
t
t
t
R
R
R
R
t
t
FB
Q
RUNHYS
RUN
SS
SENSE1,2 +
SENSE1,2 –
r(TG1,2)
f(TG1,2)
r(BG1,2)
r(BG1,2)
D(TG/BG)
D(BG/TG)
m
FB
REFLNREG
LOADREG
RUN
RUNHYS
SENSE1,2(MAX)
SENSE(MATCH)
SENSE(CM)
UP(TG1,2)
DN(TG1,2)
UP(TG1,2)
DN(TG1,2)
PARAMETER
Chip Bias Voltage Operating Range
Regulated Feedback Voltage
Feedback Current
Reference Line Voltage Regulation
Output Voltage Load Regulation
(Note 4)
Error Amplifier Transconductance
Input DC Supply Current
Pulse-Skipping or Forced Continuous Mode
Sleep Mode
Shutdown
INTV
RUN Pin ON Threshold
RUN Pin Hysteresis
RUN Pin Hysteresis Current
RUN Pin Current
Soft-Start Charge Current
Maximum Current Sense Threshold
Matching Between V
V
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage V
SENSE
SENSE
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
SENSE2(MAX)
CC
+
–
Undervoltage Lockout Thresholds
Pin Current
Pin Current
SENSE1(MAX)
and
IN
)
CONDITIONS
I
(Note 4)
VBIAS = 6V to 38V
Measured in Servo Loop;
ΔI
Measured in Servo Loop;
ΔI
I
(Note 5)
RUN = 5V; V
RUN = 5V; V
RUN = 0V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
C
C
C
C
C
C
TH
TH
INTVCC
INTVCC
RUN
RUN
RUN
SS
FB
FB
FB
FB
FB
FB
FB
FB
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
TH
TH
The
= 1.2V (Note 4)
= 1.2V
= 1.1V, I
= 1.1V, I
= 1.1V, I
= 1.1V, I
= 1.1V, I
= 1.1V, I
= 1.1V, I
= 1.1V, I
= GND
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2V
A
Rising
> 1.28V
< 1.28V
= 3300pF (Note 6)
= 3300pF (Note 6)
= 3300pF (Note 6)
= 3300pF (Note 6)
= 3300pF (Each Driver)
= 3300pF (Each Driver)
= 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
l
Ramping Up
Ramping Down
denotes the specifications which apply over the full operating
LIM
LIM
LIM
LIM
LIM
LIM
LIM
LIM
FB
FB
= 1.25V (No Load)
= 1.25V (No Load)
= Float
= Float
= INTV
= Float
= GND
= INTV
= Float
= GND
CC
CC
l
l
l
l
l
l
l
l
l
l
l
l
1.188
MIN
1.18
–12
–10
4.5
3.6
2.5
90
68
42
–9
7
1.200
0.002
–0.01
0.01
1.28
TYP
135
100
100
200
1.2
4.1
3.8
4.5
0.5
1.2
1.2
1.2
1.2
±5
10
75
50
20
20
20
20
70
70
2
8
0
0
0
LTC3787
1.212
MAX
0.02
–0.1
1.38
±50
300
110
300
0.1
4.3
38
20
13
82
56
12
10
38
±1
9
UNITS
mmho
3787fa
3
%/V
mA
mV
mV
mV
mV
mV
mV
mV
nA
µA
µA
µA
µA
µA
µA
µA
ns
ns
ns
ns
ns
ns
%
%
Ω
Ω
Ω
Ω
V
V
V
V
V
V