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参数资料
| 型号： | LTC1871IMS#TRPBF-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 1/36页 |
| 文件大小： | 354K |
| 代理商： | LTC1871IMS#TRPBF-1 |
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1
LTC1871-1
18711fa
Wide Input Range, No RSENSE
TM
Current Mode Boost,
Flyback and SEPIC Controller
The LTC
1871-1 is a wide input range, current mode,
boost, flyback or SEPIC controller that drives an N-
channel power MOSFET and requires very few external
components. It eliminates the need for a current sense
resistor by utilizing the power MOSFET’s on-resistance,
thereby maximizing efficiency. Higher output voltage
applications are possible with the LTC1871-1 by connect-
ing the SENSE pin to a resistor in the source of the power
MOSFET.
The IC’s operating frequency can be set with an external
resistor over a 50kHz to 1MHz range, and can be synchro-
nized to an external clock using the MODE/SYNC pin.
The LTC1871-1 differs from the LTC1871 by having a
lower pulse skip threshold, making it ideal for applica-
tions requiring constant frequency operation at light
loads. The lower pulse skip threshold also helps maintain
constant frequency operation in applications with a wide
input voltage range. For applications requiring primary-
to-secondary side isolation, please refer to the LTC1871
datasheet.
The LTC1871-1 is available in the 10-lead MSOP package.
■ High Efficiency (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
■ Ultra Low Pulse Skip Threshold for Wide Input
Range Applications
■ Micropower Shutdown: IQ = 10μA
■ Programmable Operating Frequency
(50kHz to 1MHz) with One External Resistor
■ Synchronizable to an External Clock Up to 1.3
× fOSC
■ 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
■
Telecom Power Supplies
■ Portable Electronic Equipment
Figure 1. High Efficiency 3.3V Input, 5V Output Boost Converter (Bootstrapped)
Efficiency of Figure 1
OUTPUT CURRENT (A)
30
EFFICIENCY
(%)
90
100
80
50
70
60
40
0.001
0.1
1
10
1871 F01b
0.01
Burst Mode
OPERATION
PULSE-SKIP
MODE
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
+
RUN
ITH
FB
FREQ
MODE/SYNC
SENSE
VIN
INTVCC
GATE
GND
LTC1871-1
RT
80.6k
1%
R2
37.4k
1%
R1
12.1k
1%
CVCC
4.7
μF
X5R
CIN
22
μF
6.3V
×2
M1
D1
L1
1
μH
RC
22k
CC1
6.8nF
CC2
47pF
COUT1
150
μF
6.3V
×4
VIN
3.3V
VOUT
5V
7A
(10A PEAK)
GND
1871 F01a
+
COUT2
22
μF
6.3V
X5R
×2
CIN:
TAIYO YUDEN JMK325BJ226MM
COUT1: PANASONIC EEFUEOJ151R
COUT2: TAIYO YUDEN JMK325BJ226MM
D1: MBRB2515L
L1: SUMIDA CEP125-H 1R0MH
M1: FAIRCHILD FDS7760A
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. No RSENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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