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參數資料
| 型號： | 1977IFE |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current |
| 中文描述： | 高電壓，500kHz降壓1.5安培的電流型開關穩壓器的靜態電流為100uA |
| 文件頁數： | 1/24頁 |
| 文件大小： | 288K |
| 代理商： | 1977IFE |
LT1977
1
1977f
■
High Voltage Power Conversion
■
14V and 42V Automotive Systems
■
Industrial Power Systems
■
Distributed Power Systems
■
Battery-Powered Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
*U.S. Patent 6,498,466 and 6,531,909 **See Burst Mode Operation section for conditions
■
Wide Input Range: 3.3V to 60V
■
1.5A Peak Switch Current
■
Burst Mode
Operation: 100
μ
A Quiescent Current**
■
Low Shutdown Current: I
Q
< 1
μ
A
■
Power Good Flag with Programmable Threshold
■
Load Dump Protection to 60V
■
500kHz Switching Frequency
■
Saturating Switch Design: 0.2
On-Resistance
■
Peak Switch Current Maintained Over
Full Duty Cycle Range*
■
1.25V Feedback Reference Voltage
■
Easily Synchronizable
■
Soft-Start Capability
■
Small 16-Pin Thermally Enhanced TSSOP Package
High Voltage 1.5A, 500kHz
Step-Down Switching Regulator
with 100
μ
A Quiescent Current
DESCRIPTIOU
The LT
1977 is a 500kHz monolithic buck switching
regulator that accepts input voltages up to 60V. A high
efficiency 1.5A, 0.2
switch is included on the die along
with all the necessary oscillator, control and logic cir-
cuitry. Current mode topology is used for fast transient
response and good loop stability.
Innovative design techniques along with a new high volt-
age process achieve high efficiency over a wide input
range. Efficiency is maintained over a wide output current
range by employing Burst Mode operation at low currents,
utilizing the output to bias the internal circuitry, and by
using a supply boost capacitor to fully saturate the power
switch. Patented circuitry maintains peak switch current
over the full duty cycle range.* Shutdown reduces input
supply current to less than 1
μ
A. External synchronization
can be implemented by driving the SYNC pin with logic-level
inputs. A single capacitor from the C
SS
pin to the output
provides a controlled output voltage ramp (soft-start). The
device also has a power good flag with a programmable
threshold and time-out and thermal shutdown protection.
The LT1977 is available in a 16-pin TSSOP package with
exposed pad leadframe for low thermal resistance. The
LT1976, a 200kHz reduced switch frequency version of the
LT1977, is also available. See the Applications Information
section for selection criteria between the LT1976 and
LT1977.
V
IN
SHDN
BOOST
LT1977
2.2
μ
F
100V
CER
330pF
0.1
μ
F
0.1
μ
F
10
μ
H
1N4148
1
μ
F
SYNC
GND
C
T
100
μ
F
6.3V
TANT
V
3.3V
1A
V
IN
10MQ100N
1500pF
26k
165k
1%
100k
1%
1977 TA01
10pF
SW
C
SS
V
BIAS
V
C
+
FB
PGFB
PG
14V to 3.3V Step-Down Converter with
100
μ
A No Load Quiescent Current
Efficiency and Power Loss
vs Load Current
LOAD CURRENT (A)
0.0001
0
E
P
25
0.001
0.01
0.1
1
1977 TA02
75
100
50
0.001
10
0.01
1
10
0.1
V
IN
= 12V
3.3V
5V
EFFICIENCY
TYPICAL
POWER LOSS
Supply Current vs Input Voltage
INPUT VOLTAGE (V)
0
0
S
μ
A
50
100
10
20
30
40
1977 F05
50
150
25
75
125
60
V
OUT
= 3.3V
T
A
= 25
°
C
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
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