ltc1871ems-trpbf Linear Technology Corporation, ltc1871ems-trpbf Datasheet - Page 4

• Manufacturer Part Number: ltc1871ems-trpbf
• Description: Wide Input Range, No Rsense Current Mode Boost, Flyback And Sepic Controller
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
LTC1871
temperature range, otherwise specifi cations are at T
otherwise specifi ed.
SYMBOL
D
f
t
t
V
V
R
V
Low Dropout Regulator
V
ΔV
ΔV
V
V
I
GATE Driver
t
t
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 LTC1871E is guaranteed to meet performance specifi cations
from 0°C to 85°C operating temperature. Specifi cations over the – 40°C to
85°C operating temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC1871I is
guaranteed over the full –40°C to 125°C operating temperature range
and the LTC1871H is guaranteed over the full –40°C to 150°C operating
temperature range.
Note 3: T
dissipation P
4
SYNC/
SYNC(MIN)
SYNC(MAX)
INTVCC
r
f
IL(MODE)
IH(MODE)
FREQ
INTVCC
Δ V
LDO(LOAD)
DROPOUT
MAX
MODE/SYNC
Δ V
INTVCC
INTVCC
T
IN1
IN2
J
f
OSC
= T
J
A
is calculated from the ambient temperature T
+ (P
D
PARAMETER
according to the following formula:
Maximum Duty Cycle
Recommended Maximum Synchronized
Frequency Ratio
MODE/SYNC Minimum Input Pulse Width
MODE/SYNC Maximum Input Pulse Width V
Low Level MODE/SYNC Input Voltage
High Level MODE/SYNC Input Voltage
MODE/SYNC Input Pull-Down Resistance
Nominal FREQ Pin Voltage
INTV
INTV
INTV
INTV
INTV
Bootstrap Mode INTV
Current in Shutdown
GATE Driver Output Rise Time
GATE Driver Output Fall Time
D
• 110°C/W)
CC
CC
CC
CC
CC
Regulator Output Voltage
Regulator Line Regulation
Regulator Line Regulation
Load Regulation
Regulator Dropout Voltage
CC
Supply
A
and power
CONDITIONS
I-Grade or H-Grade (Note 2)
f
f
V
I-Grade or H-Grade (Note 2)
I-Grade or H-Grade (Note 2)
V
V
V
7.5V ≤ V
15V ≤ V
0 ≤ I
V
RUN = 0V, SENSE = 5V
I-Grade (Note 2)
H-Grade (Note 2)
C
C
A
OSC
OSC
SYNC
SYNC
IN
IN
IN
IN
L
L
= 25°C. V
= 3300pF (Note 7)
= 3300pF (Note 7)
= 7.5V
= 7.5V, I-Grade (Note 2)
= 7.5V, H-Grade (Note 2)
= 5V, INTV
INTVCC
= 300kHz (Note 6)
= 300kHz (Note 6), I-Grade or H-Grade (Note 2)
= 0V to 5V
= 0V to 5V
The
IN
IN
≤ 30V
≤ 15V
≤ 20mA, V
l
IN
CC
denotes the specifi cations which apply over the full operating
= V
Load = 20mA
INTVCC
Note 4: The dynamic input supply current is higher due to power MOSFET
gate charging (Q
Note 5: The LTC1871 is tested in a feedback loop which servos V
the reference voltage with the I
range (0.3V ≤ V
Note 6: In a synchronized application, the internal slope compensation
gain is increased by 25%. Synchronizing to a signifi cantly higher ratio will
reduce the effective amount of slope compensation, which could result in
subharmonic oscillation for duty cycles greater than 50%.
Note 7: Rise and fall times are measured at 10% and 90% levels.
IN
= 7.5V
= 5V, V
RUN
ITH
G
• f
≤ 1.2V, midpoint = 0.75V).
= 1.5V, R
OSC
). See Applications Information.
FREQ
TH
pin forced to the midpoint of its voltage
●
●
●
●
●
●
●
●
= 80k, V
MIN
4.95
1.2
1.2
5.0
5.0
– 2
87
87
MODE/SYNC
0.8/f
1.25
0.62
–0.2
1.25
TYP
280
5.2
5.2
5.2
92
92
25
50
70
10
17
8
8
OSC
= 0V, unless
MAX
1.30
1.30
5.45
200
100
100
0.3
0.3
5.4
5.4
97
97
25
20
30
50
FB
to
UNITS
1871fe
mV
mV
mV
kΩ
μA
μA
μA
ns
ns
ns
ns
%
%
%
V
V
V
V
V
V
V
V