参数资料
型号: LT3690HUFE#TRPBF
厂商: Linear Technology
文件页数: 1/30页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 4A 26QFN
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.8 V ~ 20 V
输入电压: 3.9 V ~ 36 V
PWM 型: 电流模式,混合
频率 - 开关: 138kHz ~ 1.5MHz
电流 - 输出: 4A
同步整流器:
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: 26-WFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 26-QFN-EP(4x6)

LT3690
FEATURES
36V, 4A, 1.5MHz Synchronous
Step-Down Switching Regulator
with 70μA Quiescent Current
DESCRIPTION
Wide Input Range:
4A Maximum Output Current
Integrated 30m? N-Channel Synchronous Switch
Low Ripple (<15mV P-P ) Burst Mode ? Operation:
Programmable Input Undervoltage Lockout
0.8V Feedback Reference Voltage
Output Voltage: 0.8V to 20V
Programmable and Synchronizable Oscillator
Soft-Startup and Output Voltage Tracking
Short-Circuit Robust
Power Good Flag
Small Thermally Enhanced 4mm × 6mm QFN Package
Automotive Systems
Industrial Supplies
Distributed Supply Regulation
n
– Operation from 3.9V to 36V
– Overvoltage Lockout Protects Circuits
Through 60V Transients
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I Q = 70μA at 12V IN to 3.3V OUT
n
n
n
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(170kHz to 1.5MHz)
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APPLICATIONS
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The LT ? 3690 is an adjustable frequency monolithic buck
switching regulator that accepts input voltages up to 36V.
A high efficiency 90mΩ switch is included on the device
along with the boost diode and the necessary oscillator,
control, and logic circuitry. The internal synchronous power
switch of 30mΩ increases efficiency and eliminates the
need for an external Schottky catch diode. Current mode
topology is used for fast transient response and good
loop stability. Shutdown reduces input supply current to
less than 1μA. The low ripple Burst Mode maintains high
efficiency at low output currents while keeping output
ripple below 15mV in typical applications.
The LT3690 features robust operation and is easily con-
figurable. Using a resistor divider on the UVLO pin provides
a programmable undervoltage lockout. A power good flag
signals when V OUT reaches 90% of the programmed out-
put voltage. Protection circuitry senses the current in the
power switches to protect the LT3690 against short-circuit
conditions. Frequency foldback and thermal shutdown
provide additional protection. The LT3690 is available in
a 4mm × 6mm QFN package with exposed pads for low
thermal resistance.
L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V Step-Down Converter
Efficiency and Power Loss
V IN
4.5V TO 36V
10μF
EN
UVLO
SS
V IN
LT3690
BST
SW
BIAS
0.68μF
3.3μH
3.3V
4A
100
90
80
V OUT = 5V
V OUT = 3.3V
2.5
2.0
1.5
22k
680pF
0.47μF
V C
V CCINT
SYNC
GND
PG
FB
RT
? = 600kHz
32.4k
316k
102k
100μF
70
60
50
0
0.5
1
1.5
V OUT = 5V
2 2.5 3 3.5
V OUT = 3.3V
V IN = 12V
L = 4.7μH
? = 600kHz
4
1.0
0.5
0
3690 TA01a
LOAD CURRENT (A)
3690 TA01b
3690fa
1
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LT3690IUFE#TRPBF 功能描述:IC REG BUCK SYNC ADJ 4A 26QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压(升压) 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型,TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT
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