参数资料
型号: LT3684IDD#PBF
厂商: Linear Technology
文件页数: 1/24页
文件大小: 0K
描述: IC REG BUCK ADJ 2A 10DFN
标准包装: 121
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 1.27 V ~ 20 V
输入电压: 3.6 V ~ 34 V
PWM 型: 电流模式
频率 - 开关: 300kHz ~ 3MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘
包装: 管件
供应商设备封装: 10-DFN(3x3)
产品目录页面: 1332 (CN2011-ZH PDF)
LT3684
36V, 2A, 2.8MHz Step-Down
Switching Regulator
FEATURES
DESCRIPTION
Wide Input Range: 3.6V to 34V Operating,
36V Maximum
2A Maximum Output Current
Adjustable Switching Frequency: 300kHz to 2.8MHz
Low Shutdown Current: I Q < 1μA
Integrated Boost Diode
Power Good Flag
Saturating Switch Design: 0.18 Ω On-Resistance
1.265V Feedback Reference Voltage
Output Voltage: 1.265V to 20V
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP and
(3mm × 3mm) DFN Packages
The LT ? 3684 is an adjustable frequency (300kHz to 2.8MHz)
monolithic buck switching regulator that accepts input
voltages up to 34V (36V maximum). A high ef?ciency
0.18 Ω switch is included on the die along with a boost
Schottky diode and the necessary oscillator, control and
logic circuitry. Current mode topology is used for fast
transient response and good loop stability. The LT3684’s
high operating frequency allows the use of small, low cost
inductors and ceramic capacitors resulting in low output
ripple while keeping total solution size to a minimum.
The low current shutdown mode reduces input supply
current to less than 1μA while a resistor and capacitor on
the RUN/SS pin provide a controlled output voltage ramp
APPLICATIONS
■ Automotive Battery Regulation
■ Power for Portable Products
(soft-start). A power good ?ag signals when V OUT reaches
90% of the programmed output voltage. The LT3684 is
available in 10-Pin MSOP and 3mm × 3mm DFN packages
with Exposed Pads for low thermal resistance.
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V Step-Down Converter
Ef?ciency
V IN
4.5V TO
34V
OFF ON
V IN
RUN/SS
BD
BOOST
V OUT
3.3V
2A
90
80
4.7 μ F
16.2k
V C
LT3684
SW
0.47 μ F
4.7 μ H
70
330pF
RT
PG
BIAS
324k
60
50
60.4k
GND
FB
V IN = 12V
200k
22 μ F
40
V OUT = 3.3V
L = 4.7 μ H
f = 800kHz
3684 TA01
30
0
0.5
1 1.5
2
LOAD CURRENT (A)
3684 TA01b
3684f
1
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