參數(shù)資料
型號(hào)： LTC1773
廠商： Linear Technology Corporation
英文描述： Synchronous Step-Down Regulator Controller(同步步降穩(wěn)壓器)
中文描述： 同步降壓穩(wěn)壓控制器（同步步降穩(wěn)壓器）
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 274K
代理商： LTC1773
LTC1773
1
I
High Efficiency: Up to 95%
I
Constant Frequency 550kHz Operation
I
V
IN
from 2.65V to 8.5V
I
V
OUT
from 0.8V to V
IN
I
OPTI-LOOP
TM
Compensation Minimizes C
OUT
I
Synchronizable up to 750kHz
I
Selectable Burst Mode Operation
I
Low Dropout Operation: 100% Duty Cycle
I
Secondary Winding Regulation
I
Soft-Start
I
Current Mode Operation for Excellent Line and
Load Transient Response
I
Low Quiescent Current: 80
μ
A
I
Low Shutdown I
Q
= 10
μ
A
I
±
1.5% Reference Accuracy
I
Precision 2.5V Undervoltage Lockout
I
Available in 10-Lead MSOP
APPLICATIOU
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
The LTC
1773 is a current mode synchronous buck regu-
lator controller that drives external complementary power
MOSFETs using a fixed frequency architecture. The oper-
ating supply range is from 2.65V to 8.5V, making it
suitable for one- or two-cell lithium-ion battery powered
applications. Burst Mode
TM
operation provides high effi-
ciency at low load currents. 100% duty cycle provides low
dropout operation which extends operating time in bat-
tery-operated systems.
The operating frequency is internally set at 550kHz, allow-
ing the use of small surface mount inductors. For switch-
ing-noise sensitive applications, it can be synchronized up
to 750kHz. Peak current limit is user programmable with
an external high side sense resistor. A SYNC/FCB control
pin guarantees regulation of secondary windings regard-
less of load on the main output by forcing continuous
operation. Burst Mode operation is inhibited during syn-
chronization or when the SYNC/FCB pin is pulled low to
reduce noise and RF interference. Soft start is provided by
an external capacitor.
Synchronous rectification increases efficiency and elimi-
nates the need for a Schottky diode, saving components
and board space. The LTC1773 comes in a 10-lead MSOP
package.
I
Cellular Telephones
I
RF PA Supply
I
Portable Instruments
I
Wireless MODEMS
I
Distributed Power Systems
I
Notebook and Palm Top Computers, PDAs
I
Single and Dual Cell Lithium-Ion Powered Devices
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Synchronous Step-Down
Regulator Controller
September 2000
Final Electrical Specifications
Figure 1. Step-Down Converter
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation.
High Efficiency
+
+
30k
RC
220pF
CC
0.1
μ
F
C
OUT
180
μ
F
C
IN
68
μ
F
L1
3
μ
H
V
2.65V TO 8.5V
V
2.5V
R
0.025
1773 F01
3
2
1
4
5
8
9
7
10
6
LTC1773
RUN/SS
SYNC/FCB
GND
SENSE
–
V
IN
TG
I
TH
V
FB
BG
SW
Si9801DY
R1
80.6k
R2
169k
47pF
OUTPUT CURRENT (mA)
E
100
95
90
85
80
75
70
65
60
55
1
100
1000
5000
1773 F1b
10
FIGURE 1
L = SUMIDA CDRH6D28-3R0
V
IN
= 3.3V
V
IN
= 5V
V
IN
= 8V
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參數(shù)描述
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