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LTC1871EMS Datasheet

  • LTC1871EMS

  • Wide Input Range, No RSENSE Current Mode Boost, Flyback and ...

  • 36頁

  • LINER

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LTC1871
Wide Input Range, No R
SENSE
TM
Current Mode Boost, Flyback and SEPIC Controller
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
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)
鹵2%
RUN Pin Threshold with 100mV Hysteresis
鹵1%
Internal Voltage Reference
Micropower Shutdown: I
Q
= 10碌A
Programmable Operating Frequency
(50kHz to 1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3
脳
f
OSC
User-Controlled Pulse Skip or Burst Mode
廬
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
廬
1871 is a wide input range, current mode, boost,
flyback and SEPIC controller that drives an N-channel
power MOSFET and requires very few external compo-
nents. Intended for low to medium power applications, it
eliminates the need for a current sense resistor by utiliz-
ing the power MOSFET鈥檚 on-resistance, thereby maximiz-
ing efficiency.
The IC鈥檚 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.
Burst Mode operation at light loads, a low minimum
operating supply voltage of 2.5V and a low shutdown
quiescent current of 10碌A make the LTC1871 ideally
suited for battery-operated systems.
For applications requiring constant frequency operation,
Burst Mode operation can be defeated using the MODE/
SYNC pin. Higher output voltage boost, SEPIC and fly-
back applications are possible with the LTC1871 by
connecting the SENSE pin to a resistor in the source of the
power MOSFET.
The LTC1871 is available in the 10-lead MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
APPLICATIO S
s
s
Telecom Power Supplies
Portable Electronic Equipment
TYPICAL APPLICATIO
V
IN
3.3V
L1
1碌H
D1
90
RUN
I
TH
R
C
22k
C
C1
6.8nF
C
C2
47pF
R2
37.4k
1%
R1
12.1k
1%
FB
FREQ
R
T
80.6k
1%
MODE/SYNC
LTC1871
INTV
CC
GATE
GND
C
VCC
4.7碌F
X5R
SENSE
V
IN
V
OUT
5V
7A
(10A PEAK)
C
OUT2
22碌F
6.3V
X5R
脳2
GND
80
EFFICIENCY (%)
70
60
50
40
30
0.001
100
+
M1
C
OUT1
150碌F
6.3V
脳4
+
C
IN
22碌F
6.3V
脳2
1871 F01a
C
IN
:
TAIYO YUDEN JMK325BJ226MM
C
OUT1
: PANASONIC EEFUEOJ151R
C
OUT2
: TAIYO YUDEN JMK325BJ226MM
D1: MBRB2515L
L1: SUMIDA CEP125-H 1R0MH
M1: FAIRCHILD FDS7760A
Figure 1. High Efficiency 3.3V Input, 5V Output Boost Converter (Bootstrapped)
U
Efficiency of Figure 1
Burst Mode
OPERATION
PULSE-SKIP
MODE
0.01
0.1
1
OUTPUT CURRENT (A)
10
1871 F01b
U
U
1

LTC1871EMS 產(chǎn)品屬性

  • LTC1871

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 1MHz

  • 97%

  • 2.5 V ~ 36 V

  • 無

  • 是

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • -40°C ~ 85°C

  • 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）

  • 管件

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