參數(shù)資料
型號： LTC1929IG-PG
英文描述： Analog IC
中文描述： 模擬IC
文件頁數(shù)： 1/28頁
文件大?。?/td> 389K
代理商： LTC1929IG-PG
1
LTC1929/LTC1929-PG
2-Phase, High Efficiency,
Synchronous Step-Down
Switching Regulators
DESCRIPTIOU
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP is a trademark of Linear Technology Corporation.
The LTC
1929/LTC1929-PG are 2-phase, single output,
synchronous step-down current mode switching regula-
tor controllers that drive N-channel external power MOSFET
stages in a phase-lockable fixed frequency architecture.
The 2-phase controllers drive their 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 technique effectively multiplies the fundamental
frequency by two, improving transient response while
operating each channel at an optimum frequency for
efficiency. Thermal design is also simplified.
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 synchronous 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.
Figure 1. High Current 2-Phase Step-Down Converter
I
Desktop Computers
I
Internet/Network Servers
I
Large Memory Arrays
I
DC Power Distribution Systems
I
2-Phase Single Output Controller
I
Reduces Required Input Capacitance and Power
Supply Induced Noise
I
Current Mode Control Ensures Current Sharing
I
Phase-Lockable Fixed Frequency: 150kHz to 300kHz
I
True Remote Sensing Differential Amplifier
I
OPTI-LOOP
TM
Compensation Improves Transient
Response
I
±
1% Output Voltage Accuracy
I
Power Good Output Voltage Monitor (LTC1929-PG)
I
Wide V
IN
Range: 4V to 36V Operation
I
Very Low Dropout Operation: 99% Duty Cycle
I
Adjustable Soft-Start Current Ramping
I
Internal Current Foldback
I
Short-Circuit Shutdown Timer with Defeat Option
I
Overvoltage Soft-Latch Eliminates Nuisance Trips
I
Available in 28-Lead SSOP Package
APPLICATIU
FEATURES
TYPICAL APPLICATIO
U
1929 F01
TG1
BOOST1
SW1
BG1
PGND
SENSE1
+
SENSE1
–
TG2
BOOST2
SW2
BG2
INTV
CC
SENSE2
+
SENSE2
–
V
IN
RUN/SS
EAIN
V
OS–
V
OS+
I
TH
V
DIFFOUT
LTC1929
SGND
0.1
μ
F
0.1
μ
F
16k
1000pF
10
10k
16k
+
10
μ
F
35V
CERAMIC
×
4
+
C
1000
μ
F
4V
×
2
V
1.6V/40A
L1
1
μ
H
0.002
V
5V TO 28V
L2
1
μ
H
D2
D1
0.47
μ
F
0.47
μ
F
100pF
10
μ
F
0.002
C
OUT
: T510E108K004AS L1, L2: CEPH149-1ROMC
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