参数资料
型号: LTC1871EMS#TRPBF
厂商: Linear Technology
文件页数: 1/36页
文件大小: 0K
描述: IC REG CTRLR BST FLYBK CM 10MSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1MHz
占空比: 97%
电源电压: 2.5 V ~ 36 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 带卷 (TR)
LTC1871
Wide Input Range, No R SENSE ?
Current Mode Boost,
Flyback and SEPIC Controller
FEATURES
DESCRIPTION
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High Ef?ciency (No Sense Resistor Required)
Wide Input Voltage Range: 2.5V to 36V
Current Mode Control Provides Excellent
Transient Response
High Maximum Duty Cycle (92% Typ)
±2% RUN Pin Threshold with 100mV Hysteresis
±1% Internal Voltage Reference
Micropower Shutdown: I Q = 10μA
Programmable Operating Frequency
(50kHz to 1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3 × f OSC
User-Controlled Pulse Skip or Burst Mode ? Operation
Internal 5.2V Low Dropout Voltage Regulator
Output Overvoltage Protection
Capable of Operating with a Sense Resistor for
High Output Voltage Applications
Small 10-Lead MSOP Package
The LTC ? 1871 is a wide input range, current mode, boost,
?yback or SEPIC controller that drives an N-channel power
MOSFET and requires very few external components. In-
tended for low to medium power applications, it eliminates
the need for a current sense resistor by utilizing the power
MOSFET’s on-resistance, thereby maximizing ef?ciency.
The IC’s operating frequency can be set with an external
resistor over a 50kHz to 1MHz range, and can be syn-
chronized to an external clock using the MODE/SYNC
pin. Burst Mode operation at light loads, a low minimum
operating supply voltage of 2.5V and a low shutdown
quiescent current of 10μA make the LTC1871 ideally suited
for battery-operated systems.
For applications requiring constant frequency opera-
tion, Burst Mode operation can be defeated using the
MODE/SYNC pin. Higher output voltage boost, SEPIC
and ?yback applications are possible with the LTC1871
APPLICATIONS
by connecting the SENSE pin to a resistor in the source
of the power MOSFET.
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Telecom Power Supplies
Portable Electronic Equipment
The LTC1871 is available in the 10-lead MSOP package.
L , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
L1
1μH
D1
V IN
3.3V
100
90
Ef?ciency of Figure 1
C C2
47pF
R C
22k
C C1
6.8nF
R2
37.4k
1%
R1
12.1k
1%
R T
80.6k
1%
RUN SENSE
I TH V IN
LTC1871
FB INTV CC
FREQ GATE
MODE/SYNC GND
C VCC
4.7μF
X5R
+
C IN
22μF
6.3V
× 2
M1
+
C OUT1
150μF
6.3V
× 4
V OUT
5V
7A
(10A PEAK)
C OUT2
22μF
6.3V
X5R
× 2
GND
1871 F01a
80
70
60
50
40
PULSE-SKIP
MODE
Burst Mode
OPERATION
C IN : TAIYO YUDEN JMK325BJ226MM
C OUT1 : PANASONIC EEFUEOJ151R
C OUT2 : TAIYO YUDEN JMK325BJ226MM
D1: MBRB2515L
L1: SUMIDA CEP125-H 1R0MH
M1: FAIRCHILD FDS7760A
30
0.001
0.01 0.1 1
OUTPUT CURRENT (A)
10
1871 F01b
Figure 1. High Ef?ciency 3.3V Input, 5V Output Boost Converter (Bootstrapped)
1871fe
1
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