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参数资料
| 型号： | LTC1778IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 电源电压： | 4 V ~ 36 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 ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC1778/LTC1778-1
Wide Operating Range,
No R SENSE TM Step-Down Controller
FEATURES
DESCRIPTIO
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No Sense Resistor Required
True Current Mode Control
Optimized for High Step-Down Ratios
t ON(MIN) ≤ 100ns
Extremely Fast Transient Response
Stable with Ceramic C OUT
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor (LTC1778)
Adjustable On-Time (LTC1778-1)
Wide V IN Range: 4V to 36V
± 1% 0.8V Voltage Reference
Adjustable Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Micropower Shutdown: I Q < 30 μ A
Available in a 16-Pin Narrow SSOP Package
The LTC ? 1778 is a synchronous step-down switching
regulator controller optimized for CPU power. The con-
troller uses a valley current control architecture to deliver
very low duty cycles with excellent transient response
without requiring a sense resistor. Operating frequency is
selected by an external resistor and is compensated for
variations in V IN .
Discontinuous mode operation provides high efficiency
operation at light loads. A forced continuous control pin
reduces noise and RF interference, and can assist second-
ary winding regulation by disabling discontinuous opera-
tion when the main output is lightly loaded.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit level is user program-
APPLICATIO S
mable. Wide supply range allows operation from 4V to 36V
at the input and from 0.8V up to (0.9)V IN at the output.
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Notebook and Palmtop Computers
Distributed Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6100678, 6580258, 5847554, 6304066
TYPICAL APPLICATIO
R ON
1.4M ?
Efficiency vs Load Current
C C
500pF
C SS
0.1 μ F
R C
20k
RUN/SS TG
I TH BOOST
LTC1778
I ON
V IN
SW
C B 0.22 μ F
D B
CMDSH-3
M1
Si4884
L1
1.8 μ H
+
C IN
10 μ F
50V
× 3
C OUT
180 μ F
4V
V IN
5V TO 28V
V OUT
2.5V
10A
100
90
80
V OUT = 2.5V
V IN = 5V
V IN = 25V
SGND
INTV CC
BG
+
C VCC
M2
Si4874
D1
B340A
× 2
70
PGOOD
PGND
4.7 μ F
R2
30.1k
V FB
R1
14k
60
0.01
0.1 1
LOAD CURRENT (A)
10
1778 F01b
1778 F01a
Figure 1. High Efficiency Step-Down Converter
1778fb
1
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