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参数资料
| 型号： | LTC3831IGN |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件页数： | 1/20页 |
| 文件大小： | 208K |
| 代理商： | LTC3831IGN |
LTC3831
1
3831fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Power Synchronous
Switching Regulator Controller
for DDR Memory Termination
The LTC3831 is a high power, high efciency switching
regulator controller designed for DDR memory termina-
tion. The LTC3831 generates an output voltage equal
to 1/2 of an external supply or reference voltage. The
LTC3831 uses a synchronous switching architecture
with N-channel MOSFETs. Additionally, the chip senses
output current through the drain-source resistance of the
upper N-channel FET, providing an adjustable current limit
without a current sense resistor.
The LTC3831 operates with input supply voltage as low as
3V and with a maximum duty cycle of > 91%. It includes
a xed frequency PWM oscillator for low output ripple
operation. The 200kHz free-running clock frequency can
be externally adjusted or synchronized with an external
signal from 100kHz to above 500kHz. In shutdown mode,
the LTC3831 supply current drops to <10μA.
Figure 1. Typical DDR Memory Termination Application
n High Power Switching Regulator Controller
for DDR Memory Termination
n VOUT Tracks 1/2 of VIN or External VREF
n No Current Sense Resistor Required
n Low Input Supply Voltage Range: 3V to 8V
n Maximum Duty Cycle > 91% Over Temperature
n Drives All N-Channel External MOSFETs
n High Efciency: Over 95% Possible
n Programmable Fixed Frequency Operation:
100kHz to 500kHz
n External Clock Synchronization Operation
n Programmable Soft-Start
n Low Shutdown Current: <10μA
n Overtemperature Protection
n Available in 16-Pin Narrow SSOP Package
n DDR SDRAM Termination
n SSTL_2 Interface
n SSTL_3 Interface
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Efciency vs Load Current
TG
IMAX
IFB
BG
PGND
GND
R+
FB
VCC
SS
FREQSET
SHDN
COMP
PVCC2
MBR0530T1
5V
10k
1k
0.1μF
LO
1.2μH
Q2
CIN: SANYO POSCAP 6TPB330M
COUT: SANYO POSCAP 4TPB470M
Q1, Q2: SILICONIX Si4410DY
COUT
470μF
×3
VTT
1.25V
±6A
3831 F01
Q1
MBRS340T3
VDDQ
2.5V
LTC3831
1μF
SHDN
+
4.7μF
PVCC1
R–
+
CIN
330μF
×2
+
0.1μF
C1
33pF
0.01μF
130k
CC
1500pF
RC
15k
LOAD CURRENT (A)
0
EFFICIENCY
(%)
20
40
60
1
2
34
2831 G01
5
80
100
10
30
50
70
90
6
TA = 25°C
VIN = 2.5V
VOUT = 1.25V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3831IGN#PBF | 功能描述:IC SW REG CONTROLLR SYNC 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3831IGN#TRPBF | 功能描述:IC SW REG CONTROLLR SYNC 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3832-1ES8 | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3832-1ES8#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3832-1ES8#TR | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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