參數(shù)資料
型號(hào)： LTC1628
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述： 射頻放大器
文件頁數(shù)： 1/32頁
文件大?。?/td> 366K
代理商： LTC1628
1
LTC1628/LTC1628-PG
High Efficiency, 2-Phase
Synchronous Step-Down Switching Regulators
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
I
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
I
OPTI-LOOP
TM
Compensation Minimizes C
OUT
I
Dual N-Channel MOSFET Synchronous Drive
I
±
1% Output Voltage Accuracy
I
Power Good Output Voltage Monitor (LTC1628-PG)
I
DC Programmed Fixed Frequency 150kHz to 300kHz
I
Wide V
IN
Range: 3.5V to 36V 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
Remote Output Voltage Sense
I
Low Shutdown I
Q
: 20
μ
A
I
5V and 3.3V Standby Regulators
I
Small 28-Lead SSOP Package
I
Selectable Constant Frequency or Burst Mode
TM
Operation
APPLICATIU
The LTC
1628/LTC1628-PG are high performance dual
step-down switching regulator controllers that drive all
N-channel synchronous power MOSFET stages. A con-
stant frequency current mode architecture allows adjust-
ment of the frequency up to 300kHz. 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 3.5V to 30V (36V 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 LTC1628-PG includes a power
good output pin that replaces the FLTCPL, fault coupling
control pin of the LTC1628.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
I
Notebook and Palmtop Computers, PDAs
I
Battery Chargers
I
Portable Instruments
I
Battery-Operated Digital Devices
I
DC Power Distribution Systems
DESCRIPTIOU
FEATURES
TYPICAL APPLICATIO
U
+
4.7
μ
F
D3
D4
D1
M2
M1
C
B1
, 0.1
μ
F
R2
105k
1%
1000pF
L1
6.3
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
D2
M4
M3
C
B2
, 0.1
μ
F
R4
63.4k
1%
L2
6.3
μ
H
C
C2
220pF
1000pF
+
C
OUT
56
μ
F
6V
SP
R
SENSE2
R3
20k
1%
R
C2
15k
V
OUT2
3.3V
5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
SENSE1
+
SENSE2
+
SENSE1
–
SENSE2
–
V
OSENSE1
V
OSENSE2
I
TH1
RUN/SS1
I
TH2
V
IN
INTV
CC
RUN/SS2
V
5.2V TO 28V
M1, M2, M3, M4: FDS6680A
1628 F01
C
SS1
0.1
μ
F
C
SS2
0.1
μ
F
LTC1628
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC1628CGPBF 制造商:Linear Technology 功能描述:LTC1628 dual SD PS controller
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