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| 型号： | LT1931IS5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG INV 1A TSOT23-5 |
| 标准包装： | 500 |
| 类型： | 反相 |
| 输出数： | 1 |
| 输入电压： | 2.45 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
LT1931/LT1931A
1.2MHz/2.2MHz Inverting
DC/DC Converters in ThinSOT
FEATURES
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
Fixed Frequency 1.2MHz/2.2MHz Operation
Very Low Noise: 1mV P-P Output Ripple
– 5V at 350mA from 5V Input
–12V at 150mA from 5V Input
Uses Small Surface Mount Components
Wide Input Range: 2.6V to 16V
Low Shutdown Current: <1 μ A
Low V CESAT Switch: 400mV at 1A
Pin-for-Pin Compatible with the LT1611
Low Profile (1mm) ThinSOT TM Package
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
APPLICATIO S
■ Disk Drive MR Head Bias
■ Digital Camera CCD Bias
■ LCD Bias
■ GaAs FET Bias
■ Local Low Noise/Low Impedance Negative Supply
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.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATIO
V IN
L1A
10 μ H
C2
1 μ F
L1B
10 μ H
100
Efficiency
5V
95
V IN
SHDN
SW
R1
C4
D1
V OUT
–5V
350mA
90
85
C1
4.7 μ F
LT1931
GND
NFB
29.4k
R2
10k
220pF
C3
22 μ F
80
75
70
65
60
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
1931 F01
55
C3: TAIYO YUDEN X5R JMK325BJ226MM
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
50
0
50
100 150 200 250
LOAD CURRENT (mA)
300
350
Figure 1. 5V to –5V, 350mA Inverting DC/DC Converter
1931 TA01
1931fa
1
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