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參數資料
| 型號： | LT1959I |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關穩壓器 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 292K |
| 代理商： | LT1959I |
1
LT1959
DESCRIPTIOU
The LT
1959 is a 500kHz monolithic buck mode switching
regulator functionally identical to the LT1506 but optimized
for lower output voltage applications. It will operate down
to 1.21V output compared to 2.42V for the LT1506. A 4.5A
switch is included on the die along with all the necessary
oscillator, control and logic circuitry. High switching fre-
quency allows a considerable reduction in the size of ex-
ternal components. The topology is current mode for fast
transient response and good loop stability.
A special high speed bipolar process and new design tech-
niques achieve high efficiency at high switching frequency.
Efficiency is maintained over a wide output current range
by keeping quiescent supply current to 4mA
and by utiliz-
ing a supply boost
capacitor to saturate the power switch.
The LT1959 fits into standard 7-pin DD and fused lead
SO-8 packages. Full cycle-by-cycle short-circuit protection
and thermal shutdown are provided. Standard surface
mount external parts are used, including the inductor and
capacitors. There is the optional function of shutdown or
synchronization. A shutdown signal reduces supply current
to 20
μ
A. Synchronization allows an external logic level sig-
nal to increase the internal oscillator from 580kHz to 1MHz.
FEATURES
APPLICATIU
TYPICAL APPLICATIO
N
U
4.5A, 500kHz Step-Down
Switching Regulator
I
Operates with Input as Low as 4V
I
Output Range Down to 1.21V
I
Constant 500kHz Switching Frequency
I
Uses All Surface Mount Components
I
Inductor Size Reduced to 1.8
μ
H
I
Saturating Switch Design: 0.07
I
Shutdown Current: 20
μ
A
I
Easily Synchronizable
I
Cycle-by-Cycle Current Limiting
I
4.5A Switch
I
Current Mode Control
I
Portable Computers
I
Battery-Powered Systems
I
Battery Chargers
I
Distributed Power
I
5V to 3.3V Conversion
I
5V to 2.5V Conversion
I
5V to 1.8V Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
Efficiency vs Load Current
5V to 1.8V Down Converter
BOOST
LT1959
V
IN
OUTPUT
1.8V
4A
INPUT
5V
10
μ
F TO
50
μ
F
CERAMIC
1959 TA01
C2
0.68
μ
F
C
1.5nF
D1
MBRS330T3
C1
100
μ
F, 10V
SOLID
TANTALUM
C3
D2
1N914
L1
5
μ
H
V
SW
FB
SHDN
OPEN
OR
HIGH
= ON
GND
V
C
+
+
R2
2.49k
R1
1.21k
LOAD CURRENT (A)
0
E
90
85
80
75
70
2.0
2.5
3.0
3.5
1959 TA02
0.5
1.0
1.5
4.0
V
OUT
= 3.3V
V
= 5V
L = 10
μ
H
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| LT1959IR | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1959IR#PBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT1959IR#TR | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1959IR#TRPBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1959IS8 | 功能描述:IC REG BUCK ADJ 4.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
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