參數(shù)資料
型號(hào)： LTC1871-7
廠商： Linear Technology Corporation
英文描述： Quadruple 2-Input Positive-AND Gate 14-SOIC -40 to 85
中文描述： 2相升壓型DC / DC控制器
文件頁數(shù)： 3/36頁
文件大?。?/td> 411K
代理商： LTC1871-7
3
LTC1871
ELECTRICAL CHARACTERISTICS
The
G
denotes specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25
°
C.
V
IN
= V
INTVCC
= 5V, V
RUN
= 1.5V, R
FREQ
= 80k, V
MODE/SYNC
= 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
Oscillator
f
OSC
Oscillator Frequency
R
FREQ
= 80k
Oscillator Frequency Range
D
MAX
Maximum Duty Cycle
f
SYNC/
f
OSC
Recommended Maximum Synchronized
f
OSC
= 300kHz (Note 6)
Frequency Ratio
t
SYNC(MIN)
MODE/SYNC Minimum Input Pulse Width
V
SYNC
= 0V to 5V
t
SYNC(MAX)
MODE/SYNC Maximum Input Pulse Width
V
SYNC
= 0V to 5V
V
IL(MODE)
Low Level MODE/SYNC Input Voltage
V
IH(MODE)
High Level MODE/SYNC Input Voltage
R
MODE/SYNC
MODE/SYNC Input Pull-Down Resistance
V
FREQ
Nominal FREQ Pin Voltage
Low Dropout Regulator
V
INTVCC
INTV
CC
Regulator Output Voltage
V
IN
= 7.5V
V
INTVCC
INTV
CC
Regulator Line Regulation
7.5V
≤
V
IN
≤
15V
V
IN1
V
INTVCC
INTV
CC
Regulator Line Regulation
15V
≤
V
IN
≤
30V
V
IN2
V
LDO(LOAD)
INTV
CC
Load Regulation
0
≤
I
INTVCC
≤
20mA, V
IN
= 7.5V
V
DROPOUT
INTV
CC
Regulator Dropout Voltage
V
IN
= 5V, INTV
CC
Load = 20mA
I
INTVCC
Bootstrap Mode INTV
CC
Supply
RUN = 0V, SENSE = 5V
Current in Shutdown
GATE Driver
t
r
GATE Driver Output Rise Time
C
L
= 3300pF (Note 7)
t
f
GATE Driver Output Fall Time
C
L
= 3300pF (Note 7)
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
The LTC1871E is guaranteed to meet performance specifications
from 0
°
C to 70
°
C. Specifications over the –40
°
C to 85
°
C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
120
°
C/W)
Note 4:
The dynamic input supply current is higher due to power MOSFET
gate charging (Q
G
f
OSC
). See Applications Information.
Note 5:
The LTC1871 is tested in a feedback loop that servos V
FB
to the
reference voltage with the I
TH
pin forced to a voltage between 0V and 1.4V
(the no load to full load operating voltage range for the I
TH
pin is 0.3V to
1.23V).
Note 6:
In a synchronized application, the internal slope compensation
gain is increased by 25%. Synchronizing to a significantly 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.
MIN
TYP
MAX
UNITS
250
50
87
300
350
1000
97
1.30
kHz
kHz
%
92
1.25
25
ns
ns
V
V
k
0.8/f
OSC
0.3
1.2
50
0.62
V
5.0
5.2
8
5.4
25
V
mV
70
200
mV
–2
–0.2
280
10
%
mV
μ
A
20
17
8
100
100
ns
ns
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LTC1871EMS 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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