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參數資料
| 型號： | LT1931ES5 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 210K |
| 代理商： | LT1931ES5 |
1
LT1931/LT1931A
I
Fixed Frequency 1.2MHz/2.2MHz Operation
I
Very Low Noise: 1mV
P-P
Output Ripple
I
–5V at 350mA from 5V Input
I
–12V at 150mA from 5V Input
I
Uses Small Surface Mount Components
I
Wide Input Range: 2.6V to 16V
I
Low Shutdown Current: <1
μ
A
I
Low V
CESAT
Switch: 400mV at 1A
I
Low Profile (1mm) ThinSOT
TM
Package
I
Pin-for-Pin Compatible with the LT1611
The LT
1931/LT1931A are the industry’s highest power
inverting SOT-23 current mode DC/DC converters. Both
parts include a 1A integrated switch allowing high current
outputs to be generated in a small footprint. The LT1931
switches at 1.2MHz while the LT1931A switches at 2.2MHz.
These high speeds enable the use of tiny, low cost
capacitors and inductors 2mm or less in height. The
LT1931 is capable of generating –5V at 350mA or –12V
at 150mA from a 5V supply, while the LT1931A can
generate –5V at 300mA using significantly smaller induc-
tors. Both parts are easy pin-for-pin upgrades for higher
power LT1611 applications.
The LT1931/LT1931A operate in a dual inductor inverting
topology that filters both the input side and output side
current. Very low output voltage ripple approaching 1mV
P-P
can be achieved when ceramic output capacitors are used.
Fixed frequency switching ensures a clean output free
from low frequency noise typically present with charge
pump solutions. The low impedance output remains within
1% of nominal during large load steps. The 36V switch
allows V
IN
to V
OUT
differential of up to 34V.
The LT1931/LT1931A are available in the 5-lead ThinSOT
package.
I
Disk Drive MR Head Bias
I
Digital Camera CCD Bias
I
LCD Bias
I
GaAs FET Bias
I
Local Low Noise/Low Impedance Negative Supply
1.2MHz/2.2MHz Inverting
DC/DC Converters in ThinSOT
DESCRIPTIOU
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Figure 1. 5V to –5V, 350mA Inverting DC/DC Converter
V
IN
SHDN
V
IN
5V
V
OUT
–5V
350mA
1931 F01
SW
L1A
10
μ
H
L1B
10
μ
H
D1
GND
LT1931
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK325BJ226MM
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
C1
4.7
μ
F
C3
22
μ
F
C2
1
μ
F
R2
10k
R1
29.4k
C4
220pF
NFB
LOAD CURRENT (mA)
0
50
E
55
65
70
75
100
85
100
200
250
1931 TA01
60
90
95
80
50
150
300
350
Efficiency
FEATURES
APPLICATIU
TYPICAL APPLICATIO
U
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PDF描述 |
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| LT2462-SERIES | Optoelectronic |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LT1931ES5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Inv 2.45V to 16V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:IC SEMICONDUCTOR ((NS)) 制造商:Linear Technology 功能描述:IC, DC/DC CONVERTER, 5-TSOT-23; Primary Input Voltage:16V; No. of Outputs:1; Output Voltage:-12V; Output Current:350mA; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LT1931ES5#PBF | 制造商:Linear Technology 功能描述:IC |
| LT1931ES5#TR | 功能描述:IC REG INV 1A TSOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LT1931ES5#TRM | 功能描述:IC REG INV 1A TSOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LT1931ES5#TRMPBF | 功能描述:IC REG INV 1A TSOT23-5 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 |
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