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| 型号： | LT3464ETS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 115MA TSOT23-8 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 34 V |
| 输入电压： | 2.3 V ~ 10 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 115mA |
| 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-23-8 薄型，TSOT-23-8 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-8 |
LT3464
APPLICATIO S I FOR ATIO
< T OFF
LI LIM
– V + V
( V OUT IN F )
Choosing an Inductor
THE LOW CURRENT LIMIT AND FAST SWITCHING OF THE LT3464
ALLOW THE USE OF VERY SMALL SURFACE MOUNT INDUCTORS. THE
MINIMUM INDUCTOR SIZE THAT MAY BE USED IN A GIVEN
APPLICATION DEPENDS ON REQUIRED EFFICIENCY AND OUTPUT
CURRENT. SOME INDUCTORS THAT WORK WITH THE LT3464 ARE
LISTED IN TABLE 1, ALTHOUGH THERE ARE MANY OTHER MANUFAC-
TURERS AND DEVICES THAT CAN BE USED. CONSULT EACH MANU-
FACTURER FOR MORE DETAILED INFORMATION AND FOR THEIR ENTIRE
SELECTION OF RELATED PARTS. MANY DIFFERENT SIZES AND SHAPES
ARE AVAILABLE.
IN DISCONTINUOUS MODE. IF THE LEFT HAND SIDE OF INEQUALITY 1
T
EVALUATES TO LESS THAN OFF , THEN USE EQUATION 3 TO CALCULATE
MAXIMUM OUTPUT CURRENT. OTHERWISE, USE EQUATION 2.
THIS INEQUALITY IS TRUE WHEN THE LT3464 IS OPERATING IN
DISCONTINUOUS MODE.
(INEQUALITY 1)
USE THIS EQUATION TO CALCULATE THE MAXIMUM OUTPUT CURRENT
WHEN THE LT3464 IS OPERATING IN CONTINUOUS MODE.
Table 1. Recommended Inductors
PART NUMBER μ H DCR
CURRENT
MANUFACTURER
I OUT ( CM ) =
( 2 LI LIM + T OFF ( V IN – V OUT – V F ))( V IN – V CESAT )
LQH32CN680K53
LQH32CN470K53
LQH32CN220K53
ELJPC220KF
ELJPA470KF
68
47
22
22
47
( ? )
2.2
1.3
0.71
4.0
2.25
(mA)
130
170
250
160
135
MURATA
814-237-1431
WWW.MURATA.COM
PANASONIC
714-373-7334
WWW.PANASONIC.COM
(2)
2 L ( V OUT – V CESAT + V F )
USE THIS EQUATION TO CALCULATE THE MAXIMUM OUTPUT CURRENT
WHEN THE LT3464 IS OPERATING IN DISCONTINUOUS MODE.
I OUT ( DCM ) =
LI LIM IN CESAT )
( V – V
(3)
WHERE V F IS THE SCHOTTKY FORWARD VOLTAGE, LIM IS THE SWITCH
I
CURRENT LIMIT, T OFF IS THE SWITCH OFF TIME, AND V CESAT IS THE
SWITCH SATURATION VOLTAGE. SEE THE ELECTRICAL SPECIFICATIONS.
CMD4D11-47 47 2.2 180 SUMIDA
847-956-0666
WWW.SUMIDA.COM 2
LB2016-220 22 1.0 105 TAIYO YUDEN
LEM2520-220 22 5.5 125 408-573-4150 2 ( LI LIM + V IN T OFF – T OFF V CESAT )(– V IN + V OUT + V F )
LEM2520-330 33 7.1 110 WWW.T-YUDEN.COM
LEMC2520-220 22 2.7 160
LEMC2520-330 33 4.8 120
LEMF2520-220 22 1.2 105
LEMC3225-680 68 3.3 120
LEMC3225-101 100 4.3 100 FIGURES 1 THROUGH 3 SHOW THE WORST-CASE MAXIMUM OUTPUT
CURRENT AS GIVEN BY EQUATIONS 2 AND 3 USING 20% INDUCTOR
THE FOLLOWING SET OF FORMULAS CAN BE USED TO CALCULATE DERATING AND WORST-CASE LT3464 SPECIFICATIONS. ALSO NOTE
MAXIMUM OUTPUT CURRENT GIVEN V IN , V OUT AND L VALUES. THAT FOR SOME APPLICATIONS THE MAXIMUM OUTPUT CURRENT IS
INEQUALITY 1 IS USED TO DETERMINE IF THE LT3464 IS OPERATING LIMITED TO 25MA BY THE OUTPUT DISCONNECT CIRCUITRY.
17.5
25
25
15.0
12.5
10.0
7.5
L = 47μH
L = 22μH
L = 10μH
20
15
10
L = 47μH
L = 22μH
L = 10μH
20
15
10
L = 47μH
L = 22μH
L = 10μH
5.0
5
5
2.5
0
10
L = 4.7μH
15
20
25
V OUT (V)
30
35
3464 F01
0
10
L = 4.7μH
15
20
25
V OUT (V)
30
35
3464 F02
0
15
L = 4.7μH
20
25
V OUT (V)
30
35
3464 F03
Figure 1. Maximum Output Current
V IN = 3.6V
8
Figure 2. Maximum Output Current
V IN = 5V
Figure 3. Maximum Output Current
V IN = 8.4V
3464f
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