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| 型号： | LTC3816IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/44页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER S-PHASE 38TSSOP |
| 标准包装： | 200 |
| 应用： | 控制器，Intel IMVP-6，IMVP-6.5? |
| 输入电压： | 4.5 V ~ 36 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-TFSOP （0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 38-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3816
APPLICATIONS INFORMATION
V UVLO = 1 . 2 V = V IN ( UVLO )
LDO,INTV CC /EXTV CC POWERSUPPLY
The LTC3816 is designed to operate with a wide range of
V IN input voltages. The IC includes a 5.2V LDO to power
the driver and control circuits. The LDO output, INTV CC
should be bypassed with a minimum 4.7μF low ESR
ceramic capacitor. The INTV CC regulator can supply up to
50mA of total LTC3816 quiescent current, I Q(TOT) , which
consists of the static supply current, I Q , and the current
required to charge the gate capacitance, Q G(TOT) , of the
top and bottom power MOSFETs.
I Q(TOT) = I Q + Q G(TOT) ? f OSC
P DISS = V IN ? (I Q + Q G(TOT) ? f OSC )
T J = T A + P DISS ? θ JA
The value of Q G(TOT) can be obtained from the MOSFET
data sheets. For high V IN and high frequency operation,
care must be taken to ensure that the maximum junction
temperature T JMAX of the IC is never exceeded.
When the EXTV CC pin is left open or tied to a voltage less
than 4.5V, the 5.2V LDO powers INTV CC . If EXTV CC is taken
above 4.5V, the LDO is turned off and an internal switch
connects INTV CC to EXTV CC . Do not apply greater than 6V
to the EXTV CC pin, and ensure that EXTV CC < V IN + 0.3V
unless EXTV CC is shorted to the V IN supply. Using the
EXTV CC pin allows INTV CC to be powered from an external
source reducing LDO losses and improving the regulator
efficiency, especially at high V IN . When the EXTV CC pin is
used, the chip power dissipation reduces to:
P DISS = V EXTVCC ? (I Q + Q G(TOT) ? f OSC )
If the V IN supply is low enough for the INTV CC LDO to enter
dropout, the output voltage of the LDO becomes:
V INTVCC(DROPOUT) = V IN – V DROPOUT
advisable to short EXTV CC to V IN . In this case, the INTV CC
output voltage becomes:
V INTVCC(EXTVCC) = V EXTVCC – I Q(TOT) ? R EXTVCC
where R EXTVCC is the internal EXTV CC switch on-resistance.
It has a typical value of 2? at 25°C and has a temperature
coefficient of approximately 4000ppm/°C.
UNDERVOLTAGE LOCKOUT AND SHUTDOWN
A precision undervoltage lockout (UVLO) comparator
monitors the INTV CC voltage and enables soft-start opera-
tion once INTV CC is above 3.9V. For power supplies that
start-up slowly, the gate drivers could begin switching
when V IN is well below its steady-state value. The high
inrush current through the input power cable could cause
the V IN supply to dip below the UVLO threshold and result
in hiccup operation at start-up. This problem can be eas-
ily overcome by adding a V IN UVLO function as shown in
Figure 3. Connect an external resistive divider from V IN to
VR ON . Set the resistive divider according to the following
equation:
R ON 1
R ON 1 + R ON 2
where V IN(UVLO) is the desired V IN UVLO threshold. The
resistances are normally chosen so that the error caused
by the internal 1μA pull-up current has a negligible effect
on the UVLO threshold. Be careful not to allow the resistive
divider output voltage to exceed the 6V maximum rating
of the VR ON pin.
If the external resistive divider is not used, upon power-
up, the VR ON pin is pulled up by an internal 1μA pull-up
current. The LTC3816 can be put into a low power shut-
R ON2
+
TheLDOdropoutvoltageisafunctionofthetotalquies-
cent current I Q(TOT) , V IN voltage and junction temperature.
The temperature coefficient of the LDO dropout voltage
is approximately 6400ppm/°C. To enable proper opera-
tion, make sure that the LDO output voltage meets the
INTV CC undervoltage and minimum MOSFET gate driver
requirements. If V IN is connected to a fixed 5V supply, it is
SHUTDOWN
V IN
1μA
VR ON
R ON1 1.2V –
Figure 3. V IN UVLO Circuit
LTC3816
ON
3816 F03
3816f
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