LTC1871-1 LINER [Linear Technology], LTC1871-1 Datasheet - Page 4

• Manufacturer Part Number: LTC1871-1
• Description: High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller
• Manufacturer: LINER [Linear Technology]

LTC3780
ELECTRICAL CHARACTERISTICS
SYMBOL
DF MAX, Boost
DF MAX, Buck
V
I
V
V
TG1, TG2 t
TG1, TG2 t
BG1, BG2 t
BG1, BG2 t
TG1/BG1 t
BG1/TG1 t
TG2/BG2 t
BG2/TG2 t
Mode
Transition 1
Mode
Transition 2
t
t
Internal V
V
∆V
V
∆V
∆V
Oscillator and Phase-Locked Loop
f
f
f
R
I
4
junction temperature range, otherwise specifi cations are at T
SS
ON(MIN,BOOST)
ON(MIN,BUCK)
NOM
LOW
HIGH
PLLLPF
RUN(ON)
SENSE(MAX)
SENSE(MIN,BUCK)
INTVCC
EXTVCC
PLLIN
LDO(LOADREG)
EXTVCC(HYS)
EXTVCC
CC
1D
2D
3D
4D
r
f
r
f
Regulator
PARAMETER
Maximum Duty Factor
Maximum Duty Factor
RUN Pin On Threshold
Soft-Start Charge Current
Maximum Current Sense Threshold
Minimum Current Sense Threshold
TG Rise Time
TG Fall Time
BG Rise Time
BG Fall Time
TG1 Off to BG1 On Delay,
Switch C On Delay
BG1 Off to TG1 On Delay,
Synchronous Switch D On Delay
TG2 Off to BG2 On Delay,
Synchronous Switch B On Delay
BG2 Off to TG2 On Delay,
Switch A On Delay
BG1 Off to BG2 On Delay,
Switch A On Delay
BG2 Off to BG1 On Delay,
Synchronous Switch D On Delay
Minimum On-Time for Main Switch in
Boost Operation
Minimum On-Time for Synchronous
Switch in Buck Operation
Internal V
Internal V
EXTV
EXTV
EXTV
Nominal Frequency
Lowest Frequency
Highest Frequency
PLLIN Input Resistance
Phase Detector Output Current
CC
CC
CC
Switchover Voltage
Switchover Hysteresis
Switch Drop Voltage
CC
CC
Voltage
Load Regulation
CONDITIONS
% Switch C On
% Switch A On (in Dropout)
V
V
Boost: V
Buck: V
Discontinuous Mode
C
C
C
C
C
C
C
C
C
C
Switch C (Note 6)
Switch B (Note 6)
7V < V
I
I
I
V
V
V
f
f
CC
CC
CC
PLLIN
PLLIN
RUN
RUN
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
PLLFLTR
PLLFLTR
PLLFLTR
= 0mA to 20mA, V
= 20mA, V
= 20mA, V
The
Rising
= 2V
< f
> f
= 3300pF (Note 5)
= 3300pF (Note 5)
= 3300pF (Note 5)
= 3300pF (Note 5)
= 3300pF Each Driver
= 3300pF Each Driver
= 3300pF Each Driver
= 3300pF Each Driver
= 3300pF Each Driver
= 3300pF Each Driver
IN
OSENSE
A
OSENSE
OSC
OSC
< 30V, V
= 1.2V
= 0V
= 2.4V
= 25°C. V
l
denotes the specifi cations which apply over the full operating
(Note 9)
EXTVCC
EXTVCC
= V
= V
EXTVCC
REF
REF
IN
Rising
= 6V
EXTVCC
– 50mV
– 50mV
= 15V unless otherwise noted.
= 5V
= 5V
l
l
l
l
MIN
–95
260
170
340
0.5
5.7
5.4
1
–110
TYP
250
250
200
180
300
150
300
200
400
–15
1.5
1.2
0.2
5.7
99
99
160
–6
50
45
45
55
80
80
80
80
50
6
15
–150
MAX
300
330
220
440
6.3
185
2
2
UNITS
3780fe
kHz
kHz
kHz
mV
mV
mV
mV
mV
kΩ
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
%
%
%
V
V
V