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参数资料
| 型号： | LTC3602EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 9.5 V |
| 输入电压： | 4.5 V ~ 10 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3602
APPLICATIONS INFORMATION
V X
V FB
V OUT
R B
The V IN operating current loss dominates the ef?ciency loss
at very low load currents whereas the I 2 R loss dominates
the ef?ciency loss at medium to high load currents.
R TB
R TA
LTC3602
TRACK/SS
3602 F05a
R A
1. The V IN operating current comprises three components:
The DC Supply Current as given in the electrical char-
acteristics, the internal MOSFET gate charge currents
and the internal topside MOSFET transition losses. The
Figure 5a. Using the TRACK/SS Pin to Track V X
V X
V OUT
TIME
(5b) Ratiometric Tracking
V X
V OUT
MOSFET gate charge current results from switching the
gate capacitance of the internal power MOSFET switches.
The gates of these switches are driven from the INTV CC
supply. Each time the gate is switched from high to
low to high again, a packet of charge dQ moves from
INTV CC to ground. The resulting dQ/dt is the current
out of INTV CC that is typically larger than the DC bias
current. In continuous mode, the gate charge current
can be approximated by I GATECHG = f(9.5nC). Since the
INTV CC voltage is generated from V IN by a linear regula-
tor, the current that is internally drawn from the INTV CC
supply can be treated as V IN current for the purposes
of ef?ciency considerations.
Transition losses apply only to the internal topside
MOSFET and become more prominent at higher input
voltages. Transition losses can be estimated from:
Transition Loss = (1.7) V IN2 ? I O(MAX) ? (120pF) ? f
2. I 2 R losses are calculated from the resistances of the
internal switches, R SW and external inductor R L . In
TIME
3602 F05b,c
continuous mode, the average output current ?owing
(5c) Coincident Tracking
Ef?ciency Considerations
The ef?ciency of a switching regulator is equal to the output
power divided by the input power times 100%. It is often
useful to analyze individual losses to determine what is
limiting the ef?ciency and which change would produce
the most improvement. Ef?ciency can be expressed as:
Ef?ciency = 100% – (L1 + L2 + L3 + ...)
where L1, L2, etc. are the individual losses as a percent-
age of input power.
Although all dissipative elements in the circuit produce
losses, two main sources usually account for most of the
losses: V IN operating current and I 2 R losses.
through inductor L is “chopped” between the main
switch and the synchronous switch. Thus, the series
resistance looking into the SW pin is a function of both
top and bottom MOSFET R DS(ON) and the duty cycle
(DC) as follows:
R SW = (R DS(ON)TOP )(DC) + (R DS(ON)BOT )(1 – DC)
The R DS(ON) for both the top and bottom MOSFETs can
be obtained from the Typical Performance Characteristics
curves. Thus, to obtain I 2 R losses, simply add R SW to
R L and multiply the result by the square of the average
output current:
I 2 R Loss = I O2 (R SW + R L )
Other losses, including C IN and C OUT ESR dissipative
losses and inductor core losses, generally account for
less than 2% of the total power loss.
3602fb
13
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