參數(shù)資料
型號(hào)： LT3694-1EFE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 2.6 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20
文件頁數(shù)： 1/28頁
文件大小： 276K
代理商： LT3694-1EFE#PBF
LT3694/LT3694-1
1
36941fa
TYPICAL APPLICATION
DESCRIPTION
36V, 2.6A Monolithic Buck
Regulator With Dual LDO
The LT
3694/LT3694-1 are monolithic, current mode
DC/DC converters with dual, low dropout regulator con-
trollers. The switching converter is a step-down converter
capable of generating up to 2.6A at its output. Each regula-
tor has independent track/soft-start circuits simplifying
power supply sequencing and interfacing with micro-
controllers and DSPs.
The switching frequency is set with a single resistor with a
range of 250kHz to 2.5MHz. The high switching frequency
permits the use of small inductors and ceramic capacitors
leading to very small triple output solutions. The constant-
switching frequency, combined with low impedance ce-
ramic capacitors, results in low, predictable output ripple.
Protection circuitry senses the current in the power switch
and external Schottky catch diode to protect the LT3694
against short-circuit conditions. Frequency foldback and
thermal shutdown provide additional protection.
With its wide input voltage range of 4V to 36V, the LT3694
regulatesabroadarrayofpowersourcesfrom4-cellbatteries
and 5V logic rails to unregulated wall transformers, lead acid
batteries and distributed power supplies. The LT3694 can be
synchronized to an external clock with the SYNC pin while
the LT3694-1 offers a CLKOUT pin allowing other DC/DC
converters to synchronize to the LT3694-1 clock.
FEATURES
APPLICATIONS
n Wide Input Range: 4V to 36V
n Overvoltage Shutdown Protects Circuit Through
70V Transients
n 2.6A Output Switching Regulator with Internal
Power Switch
n Dual, Low Dropout, Linear Regulator Controllers
with Programmable Current Limit
n Tracking/Soft-Start Inputs and Power Good Output
Simplify Soft-Start and Supply Sequencing
n Uses Small Inductors and Ceramic Capacitors
n VOUT(MIN) = 0.75V (Buck and LDOs)
n Adjustable 250kHz to 2.5MHz Switching Frequency
n Accurate Enable Threshold Allows User
Programmable Undervoltage Lockout
n Options for Clock Synchronization (LT3694) or Clock
Output to Enable Synchronization to Other Switching
Regulators (LT3694-1)
n Thermally Enhanced 28-Lead 4mm
× 5mm QFN and
20-Lead TSSOP Packages
n Automotive
n Industrial
n DSL and Cable Modems
n Distributed Power Regulation
n Wall Transformer Regulation
SW
FB3
PGOOD
RT
FB2
SYNC
VIN
VC1
BIAS
VIN
4.5V TO 36V
fSW = 800kHz
GND
LT3694
36941 TA01a
TRK/SS1
TRK/SS2
TRK/SS3
LIM2
DRV2
DA
FB1
LIM3
DRV3
EN/UVLO
BST
OUT1
3.3V
1.7A
OUT3
1.8V
450mA
OUT2
2.5V
450mA
47μF
34k
B340A
4.7μH
0.22μF
10k
OUT1
41.2k
15.4k
24.9k
10.7k
51.1k
11k
2.2μF
4.7μF
2.2μF
1nF
0.1Ω
330pF
Efficiency at VOUT = 3.3V
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.
90
80
70
60
50
100
IOUT (A)
EFFICIENCY
(%)
01
2
3
36941 TA01b
VIN = 4.5V
VIN = 12V
VIN = 36V
fSW = 800kHz
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LT3694EFE#PBF 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
LT3694EFE#TRPBF 功能描述:IC REG TRPL BUCK/LINEAR 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
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