LTC3788-1_1 LINER [Linear Technology], LTC3788-1_1 Datasheet - Page 4

• Manufacturer Part Number: LTC3788-1_1
• Description: 2-Phase, Dual Output Synchronous Boost Controller
• Manufacturer: LINER [Linear Technology]

LTC3788-1
ELECTRICAL CHARACTERISTICS
SYMBOL
INTV
V
V
V
V
V
V
Oscillator and Phase-Locked Loop
f
f
f
f
PGOOD1 and PGOOD2 Outputs
V
I
V
t
BOOST1 and BOOST2 Charge Pump
I
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3788-1 is tested under pulsed load conditions such that
T
0°C to 85°C junction temperature. Specifi cations over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3788I-1 is guaranteed over the full –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifi cations is determined by specifi c operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors. The junction temperature (T
in °C) is calculated from the ambient temperature (T
dissipation (P
where θ
4
junction temperature range, otherwise specifi cations are at T
PROG
LOW
HIGH
SYNC
PGOOD
PGOOD(DELAY)
BOOST1,2
INTVCCVIN
LDOVIN
INTVCCEXT
LDOEXT
EXTVCC
LDOHYS
PGL
PG
J
≈ T
CC
A
. The LTC3788E-1 is guaranteed to meet specifi cations from
Linear Regulator
JA
= 80°C/W.
D
, in Watts) according to the formula: T
PARAMETER
Internal V
INTV
Internal V
INTV
EXTV
EXTV
Programmable Frequency
Lowest Fixed Frequency
Highest Fixed Frequency
Synchronizable Frequency
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
PGOOD Delay
BOOST Charge Pump Available
Output Current
CC
CC
CC
CC
Load Regulation
Load Regulation
Switchover Voltage
Hysteresis
CC
CC
Voltage
Voltage
A
, in °C) and power
J
= T
A
+ (P
D
CONDITIONS
6V < VBIAS < 38V, V
I
V
I
EXTV
R
R
R
V
V
PLLIN/MODE = External Clock
I
V
V
V
Hysteresis
V
Hysteresis
PGOOD Going High to Low
V
FREQ = 0V, Forced Continuous or
Pulse-Skipping Mode
CC
CC
PGOOD
EXTVCC
FREQ
FREQ
PGOOD
FB
FB
FB
SW1,2
• θ
FREQ
FREQ
FREQ
= 0mA to 50mA, V
= 0mA to 40mA, V
The
with Respect to Set Regulated Voltage
Ramping Negative
Ramping Positive
JA
CC
),
A
= 25k
= 60k
= 100k
= 0V
= INTV
= 2mA
= 12V; V
Ramping Positive
= 5V
= 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
J
= 6V
l
,
denotes the specifi cations which apply over the full operating
CC
BOOST1,2
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specifi ed absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 4: The LTC3788-1 is tested in a feedback loop that servos V
output of the error amplifi er while maintaining I
current limit range.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: See Minimum On-Time Considerations in the Applications
Information section.
EXTVCC
EXTVCC
EXTVCC
– V
= 0V
SW1,2
= 0V
= 6V
= 4.5V;
l
MIN
335
320
485
–12
5.2
5.2
4.5
75
8
TYP
TH
250
105
400
760
350
535
–10
5.4
0.5
5.4
0.5
4.8
0.2
2.5
2.5
10
25
55
at the midpoint of the
MAX
465
380
585
850
5.6
5.6
0.4
±1
–8
12
2
2
5
FB
to the
UNITS
37881fa
kHz
kHz
kHz
kHz
kHz
kHz
mV
μA
μA
μs
%
%
%
%
%
%
V
V
V
V