参数资料
| 型号： | LT1977IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 54 V |
| 输入电压： | 3.3 V ~ 60 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LT1977
High Voltage 1.5A, 500kHz
Step-Down Switching Regulator
with 100 μ A Quiescent Current
FEATURES
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
■
■
■
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
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
APPLICATIO S
■ 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.
*Protected by U.S. Patents including 6498466, 6531909.
**See Burst Mode Operation section for conditions
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.
TYPICAL APPLICATIO
Supply Current vs Input Voltage
Efficiency and Power Loss
vs Load Current
14V to 3.3V Step-Down Converter with
100 μ A No Load Quiescent Current
150
125
V OUT = 3.3V
T A = 25 ° C
100
V IN = 12V
V OUT = 5V
10
75
1
SW
10 μ H
V IN
2.2 μ F
100V
CER
V IN BOOST
SHDN
LT1977
0.1 μ F
0.1 μ F
1N4148
10MQ100N
V OUT
3.3V
1A
100
75
50
V OUT = 3.3 V
TYPICAL
0.1
V C
C SS
50
POWER LOSS
1500pF
330pF
V BIAS
25
0.01
26k
1 μ F
C T
SYNC
GND
FB
PGFB
PG
10pF
165k
1% +
100k
1%
100 μ F
6.3V
TANT
25
0
0
10
20
30 40
50
60
0
0.0001
0.001
0.01
0.1
1
10
0.001
INPUT VOLTAGE (V)
LOAD CURRENT (A)
1977 TA01
1977 F05
1977 TA02
1977fa
1
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