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LTC1929C PDF预览

LTC1929C

更新时间： 2024-09-23 22:54:07
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 236K
描述
2-Phase, High Efficiency, Synchronous Step-Down Switching Regulator

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LTC1929C 数据手册

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Final Electrical Specifications  
LTC1929  
2-Phase, High Efficiency,  
Synchronous Step-Down  
Switching Regulator  
August 1999  
U
DESCRIPTIO  
FEATURES  
The LTC®1929 is a 2-phase, single output, synchronous  
step-down current mode switching regulator controller  
that drives N-channel external power MOSFET stages in a  
phase-lockable fixed frequency architecture. The 2-phase  
controller drives its two output stages out of phase at  
frequencies up to 300kHz to minimize the RMS ripple  
currents in both input and output capacitors. The 2-phase  
techniqueeffectivelymultipliesthefundamentalfrequency  
by two, improving transient response while operating  
each channel at an optimum frequency for efficiency.  
Thermal design is also simplified.  
■
2-Phase Single Output Controller  
■
Reduces Required Input Capacitance and Power  
Supply Induced Noise  
■
Current Mode Control Ensures Current Sharing  
■
Phase-Lockable Fixed Frequency: 150kHz to 300kHz  
■
True Remote Sensing Differential Amplifier  
OPTI-LOOPTM Compensation Improves Transient  
■
Response  
■
±1% Output Voltage Accuracy  
■
■
■
■
■
■
■
Wide VIN Range: 4V to 36V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Internal Current Foldback  
Short-Circuit Shutdown Timer with Defeat Option  
Overvoltage Soft-Latch Eliminates Nuisance Trips  
Available in 28-Lead SSOP Package  
An internal differential amplifier provides true remote  
sensing of the regulated supply’s positive and negative  
output terminals as required by high current applications.  
The RUN/SS pin provides soft-start and a defeatable,  
timed, latched short-circuit shutdown to shut down both  
channels. Internal foldback current limit provides protec-  
tion for the external sychronous MOSFETs in the event of  
an output fault. OPTI-LOOP compensation allows the  
transient response to be optimized over a wide range of  
output capacitance and ESR values.  
U
APPLICATIO S  
■
Desktop Computers  
■
Internet/Network Servers  
■
Large Memory Arrays  
DC Power Distribution Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
OPTI-LOOP is a trademark of Linear Technology Corporation.  
■
U
TYPICAL APPLICATIO  
10Ω  
V
IN  
5V TO 28V  
10µF ×4  
35V  
CERAMIC  
0.1µF  
S
V
TG1  
BOOST1  
SW1  
IN  
S
0.47µF  
0.1µF  
LTC1929  
RUN/SS  
L1  
1µH  
0.002Ω  
S
BG1  
D1  
PGND  
+
1000pF  
SENSE1  
SENSE1  
S
I
TH  
–
10k  
100pF  
TG2  
BOOST2  
SW2  
S
S
S
SGND  
V
OUT  
0.47µF  
1.6V/40A  
L2  
1µH  
S
S
8.06k  
0.002Ω  
S
V
BG2  
D2  
DIFFOUT  
S
EAIN  
–
INTV  
CC  
+
C
10µF  
OUT  
+
V
OS  
SENSE2  
SENSE2  
1000µF ×2  
8.06k  
+
–
4V  
V
OS  
C
: T510E108K004AS  
OUT  
L1, L2: CEPH149-1ROMC  
1929 TA01  
Figure 1. High Current 2-Phase Step-Down Converter  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
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