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参数资料
| 型号： | LTC1159IS-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 100% |
| 电源电压： | 4 V ~ 40 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1159IS-5TR LTC1159IS5TR |
LTC1159
LTC1159-3.3/LTC1159-5
High Efficiency Synchronous
Step-Down Switching Regulators
FEATURES
DESCRIPTIO
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Operation from 4V to 40V Input Voltage
Ultrahigh Efficiency: Up to 95%
20 μ A Supply Current in Shutdown
High Efficiency Maintained Over Wide Current Range
Current Mode Operation for Excellent Line and Load
Transient Response
Very Low Dropout Operation: 100% Duty Cycle
Short-Circuit Protection
Synchronous FET Switching for High Efficiency
Adaptive Non-Overlap Gate Drives
Available in SSOP and SO Packages
The LTC ? 1159 series is a family of synchronous step-down
switching regulator controllers featuring automatic Burst
Mode TM operation to maintain high efficiencies at low
output currents. These devices drive external complemen-
tary power MOSFETs at switching frequencies up to 250kHz
using a constant off-time current-mode architecture.
A separate pin and on-board switch allow the MOSFET
driver power to be derived from the regulated output
voltage providing significant efficiency improvement when
operating at high input voltages. The constant off-time
current-mode architecture maintains constant ripple cur-
rent in the inductor and provides excellent line and load
APPLICATIO S
transient response. The output current level is user pro-
grammable via an external current sense resistor.
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Step-Down and Inverting Regulators
Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
Industrial Power Distribution
Avionics Systems
Telecom Power Supplies
The LTC1159 automatically switches to power saving
Burst Mode operation when load current drops below
approximately 15% of maximum current. Standby current
is only 300 μ A while still regulating the output and shut-
down current is a low 20 μ A.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
V IN
+
3.3 μ F
0.15 μ F
CAP
V CC
V CC
V IN
P-GATE
P-DRIVE
EXTV CC
LTC1159-5
1N4148
0.1 μ F
D1
MBRS140T3
Si9435DY
L*
33 μ H
+ C IN
100 μ F
100V
R SENSE
1 0.05 ? 2
V OUT
100
90
LTC1159-5 Efficiency
FIGURE 1 CIRCUIT
V IN = 10V
V IN = 20V
3
4
5V/2A
80
0V = NORMAL
>2V = SHUTDOWN
3300pF
1k
C T
300pF
SHDN1
SHDN2
I TH
C T
S-GND
SENSE +
SENSE –
N-GATE
P-GND
0.01 μ F
LTC1159 ? F01
+
Si9410DY
*COILTRONICS CTX33-4-MP
C OUT
220 μ F
70
60
0.02
0.2
2
LOAD CURRENT (A)
LTC1159 ? TA01
Figure 1. High Efficiency Step-Down Regulator
1
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