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參數(shù)資料
| 型號： | LTC3728LCGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual, 550kHz, 2-Phase Synchronous Regulators |
| 中文描述： | 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 668K |
| 代理商： | LTC3728LCGN |
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LTC3728L/LTC3728LX
Dual, 550kHz, 2-Phase
Synchronous Regulators
3728lxfa
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
I
Dual, 180
°
Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
I
OPTI-LOOP
Compensation Minimizes C
OUT
I
±
1% Output Voltage Accuracy (LTC3728LC)
I
Power Good Output Voltage Indicator
I
Phase-Lockable Fixed Frequency 250kHz to 550kHz
I
Dual N-Channel MOSFET Synchronous Drive
I
Wide V
IN
Range: 4.5V to 28V Operation
I
Very Low Dropout Operation: 99% Duty Cycle
I
Adjustable Soft-Start Current Ramping
I
Foldback Output Current Limiting
I
Latched Short-Circuit Shutdown with Defeat Option
I
Output Overvoltage Protection
I
Low Shutdown I
Q
: 20
μ
A
I
5V and 3.3V Standby Regulators
I
3 Selectable Operating Modes: Constant Frequency,
Burst Mode
Operation and PWM
I
5mm
×
5mm QFN and 28-Lead Narrow SSOP
Packages
APPLICATIU
The LTC
3728L/LTC3728LX are dual high performance
step-down switching regulator controllers that drive all
N-channel synchronous power MOSFET stages. A con-
stant frequency current mode architecture allows phase-
lockable frequency of up to 550kHz. Power loss and noise
due to the ESR of the input capacitors are minimized by
operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance and
ESR values. The precision 0.8V reference and power good
output indicator are compatible with future microproces-
sor generations, and a wide 4.5V to 28V (30V maximum)
input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-start
and optional timed, short-circuit shutdown. Current
foldback limits MOSFET dissipation during short-circuit
conditions when overcurrent latchoff is disabled. Output
overvoltage protection circuitry latches on the bottom
MOSFET until V
OUT
returns to normal. The FCB mode pin
can select among Burst Mode, constant frequency mode
and continuous inductor current mode or regulate a
secondary winding. The LTC3728L/LTC3728LX include a
power good output pin that indicates when both outputs
are within 7.5% of their designed set point.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
I
Notebook and Palmtop Computers
I
Telecom Systems
I
Portable Instruments
I
Battery-Operated Digital Devices
I
DC Power Distribution Systems
+
4.7
μ
F
D3
D4
M1
C
B1
, 0.1
μ
F
R2
105k
1%
1000pF
L1
3.2
μ
H
C
220pF
R
C1
15k
1
μ
F
CERAMIC
C
IN
22
μ
F
50V
CERAMIC
+
C
OUT1
47
F
6V
SP
R
SENSE1
0.01
R1
20k
1%
V
OUT1
5V
5A
M2
C
B2
, 0.1
μ
F
R4
63.4k
1%
L2
3.2
μ
H
C
C2
220pF
1000pF
+
C
OUT
56
μ
F
6V
SP
R
SENSE2
R3
20k
1%
R
C2
15k
V
3.3V
5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
SENSE1
+
SENSE2
+
SENSE1
–
V
OSENSE1
I
TH1
RUN/SS1
SENSE2
–
V
OSENSE2
I
TH2
V
IN
PGOOD INTV
CC
RUN/SS2
V
5.2V TO 28V
M1, M2: FDS6982S
3728 F01
C
SS1
0.1
μ
F
C
SS2
0.1
μ
F
LTC3728L/
LTC3728LX
PLLIN
f
IN
500kHz
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3728LCUH | Dual, 550kHz, 2-Phase Synchronous Regulators |
| LTC3728LEGN | Dual, 550kHz, 2-Phase Synchronous Regulators |
| LTC3728LEUH | Dual, 550kHz, 2-Phase Synchronous Regulators |
| LTC3728LX | Dual, 550kHz, 2-Phase Synchronous Regulators |
| LTC3728LXCUH | Dual, 550kHz, 2-Phase Synchronous Regulators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3728LCGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3728LCGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3728LCGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3728LCUH | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3728LCUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
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