参数资料
型号: LTC1629IG-PG#PBF
厂商: Linear Technology
文件页数: 22/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 28-SSOP
标准包装: 47
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 360kHz
占空比: 99.5%
电源电压: 4 V ~ 36 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
LTC1629/LTC1629-PG
APPLICATIO S I FOR ATIO
Although the LTC1629 has a maximum input voltage of
36V, most applications will be limited to 30V by the
MOSFET BV DSS .
50A I PK RATING
Since the output voltage is below 2.4V the output resistive
divider will need to be sized to not only set the output
voltage but also to absorb the sense pin input current for
both channels.
2 ? 2 . 4 V ? V OUT ?
12V
TRANSIENT VOLTAGE
SUPPRESSOR
GENERAL INSTRUMENT
V IN
LTC1629
R 1 ( MIN ) =
20 k ? V OUT ?
? ?
= 10 k ?
? = 30 k
1.5KA24A
1629 F08
? 1 . 8 V ?
? 2 . 4 V ? 1 . 8 V ?
Figure 8. Automotive Application Protection
Design Example (Using Two Phases)
As a design example, assume V IN = 5V (nominal), V IN = 5.5V
(max), V OUT = 1.8V, I MAX = 20A, T A = 70 ° C and f = 300kHz.
The inductance value is chosen first based on a 30% ripple
current assumption. The highest value of ripple current
Choosing 1% resistors: R1=13.2k and R2=16.5k yields an
output voltage of 1.80V and satisfies the above condition.
The power dissipation on the topside MOSFET can be
easily estimated. Using a Siliconix Si4420DY for example;
R DS(ON) = 0.013 ? , C RSS = 300pF. At maximum input
voltage with T j (estimated) = 110 ° C at an elevated ambient
temperature:
V OUT ? V OUT ?
f ( ? I ) ?
V IN ?
( ) [ 1 + ( ) ( ) C ° ]
0 . 005 110 ° C ? 25
0 . 013 ? + 1 . 7 ( ) ( )( )
occursatthemaximuminputvoltage.TietheFREQSETpin
to the INTV CC pin for 300kHz operation. The minimum
inductance for 30% ripple current is:
L ≥ ? 1 ? ?
P MAIN =
1. 8 V 2
10
5 . 5 V
5 . 5 V 10 A 300 pF
( 310 kHz ) = 0 . 61 W
2
? 1 ?
?
1 . 8 V ? 1 . 8 V ?
( 300 kHz )( 30 % )( 10 A ) ? 5 . 5 V ?
≥ 1 . 35 μ H
The worst-case power disipated by the synchronous
MOSFET under normal operating conditions at elevated
ambient temperature and estimated 50 ° C junction tem-
P SYNC =
( ) ( ) ( ) ?
A2μHinductorwillproduce20%ripplecurrent.Thepeak
inductor current will be the maximum DC value plus one
half the ripple current, or 11.5A. The minimum on-time
occurs at maximum V IN :
perature rise is:
5. 5 V ? 1. 8 V
5 . 5 V
= 1 . 29 W
2
10 A 1 . 48 0 . 013
t ON ( MIN ) =
V OUT
V IN f
=
1 . 8 V
( 5 . 5 V )( 300 kHz )
= 1 . 1 μ s
A short-circuit to ground will result in a folded back current
of:
( ) ? ? = 5 . 28 A
?
+ ?
?
?
TheR SENSE resistorsvaluecanbecalculatedbyusingthe
maximum current sense voltage specification with some
accomodation for tolerances:
60mV
R SENSE =
≈ 0 . 005 ?
11 . 5 A
I SC =
25 mV
0 . 005 ?
1 200 ns 5 . 5 V
2 ? 2 μ H ?
22
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