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LTC3788 参数 Datasheet PDF下载

LTC3788图片预览
型号: LTC3788
PDF下载: 下载PDF文件 查看货源
内容描述: 多相同步升压控制器 [PolyPhase Synchronous Boost Controller]
分类和应用: 控制器
文件页数/大小: 36 页 / 358 K
品牌: LINEAR [ LINEAR INTEGRATED SYSTEMS ]
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LTC3787
PolyPhase Synchronous
Boost Controller
FEATURES
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DESCRIPTION
The LTC
®
3787 is a high performance PolyPhase
®
single
output synchronous boost converter controller that drives
two N-channel power MOSFET stages out-of-phase.
Multiphase operation reduces input and output capacitor
requirements and allows the use of smaller inductors than
the single-phase equivalent. Synchronous rectification in-
creases efficiency, reduces power losses and eases thermal
requirements, enabling high power boost applications.
A 4.5V to 38V input supply range encompasses a wide
range of system architectures and battery chemistries.
When biased from the output of the boost converter or
another auxiliary supply, the LTC3787 can operate from
an input supply as low as 2.5V after start-up. The operat-
ing frequency can be set for a 50kHz to 900kHz range or
synchronized to an external clock using the internal PLL.
PolyPhase operation allows the LTC3787 to be configured
for 2-, 3-, 4-, 6- and 12-phase operation.
The SS pin ramps the output voltage during start-up. The
PLLIN/MODE pin selects Burst Mode
®
operation, pulse-
skipping mode or forced continuous mode at light loads.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase
are registered trademarks and No R
SENSE
and ThinSOT are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by
U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.
2-Phase Operation Reduces Required Input and
Output Capacitance and Power Supply Induced Noise
Synchronous Operation for Highest Efficiency and
Reduced Heat Dissipation
Wide V
IN
Range: 4.5V to 38V (40V Abs Max) and
Operates Down to 2.5V After Start-Up
Output Voltage Up to 60V
±1% 1.200V Reference Voltage
R
SENSE
or Inductor DCR Current Sensing
100% Duty Cycle Capability for Synchronous MOSFET
Low Quiescent Current: 135μA
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Power Good Output Voltage Monitor
Low Shutdown Current, I
Q
< 8μA
Internal LDO Powers Gate Drive from VBIAS or EXTV
CC
Thermally Enhanced Low Profile 28-Pin 4mm × 5mm
QFN Package and Narrow SSOP Package
APPLICATIONS
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Industrial
Automotive
Medical
Military
TYPICAL APPLICATION
12V to 24V/10A 2-Phase Synchronous Boost Converter
V
IN
4.5V TO 24V START-UP VOLTAGE
OPERATES THROUGH TRANSIENTS DOWN TO 2.5V
V
IN
Efficiency and Power Loss
vs Output Current
100
90
10000
4mΩ
4.7μF
TG1 VBIAS INTV
CC
4.7μF
TG2
4mΩ
47μF
80
EFFICIENCY (%)
70
60
50
40
30
1000
POWER LOSS (mW)
100
3.3μH
0.1μF
BOOST1
SW1
BOOST2
SW2
3.3μH
0.1μF
V
OUT
24V AT 10A
10
232k
LTC3787
BG1
BG2
SENSE1
+
SENSE1
SENSE2
+
VFB
SENSE2
FREQ
PGND
PLLIN/MODE
ITH SS SGND
12.1k
15nF
8.66k
100pF
0.1μF
3787 TA01a
V
IN
= 12V
1
V
OUT
= 24V
10
Burst Mode OPERATION
FIGURE 10 CIRCUIT
0
0.1
0.1
1
10
0.00001 0.0001 0.001 0.01
OUTPUT CURRENT (A)
20
220μF
3787 TA01b
BURST EFFICIENCY
BURST LOSS
3787fc
1