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| 型号： | LTC3816IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/44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
I L ( PEAK ) =
? I L I IMAX ? R IMAX ? I L
I LOAD ( MAX ) < I LIMIT = I L ( P EAK ) – = –
V OUT ? 1 – OUT ?
? I L =
downmodebypullingtheVR ON pinbelow0.65V.Inthe
shutdown mode, the internal circuitry and the INTV CC
regulator are off and the supply current drops well below
100μA. When the VR ON pin voltage is between 0.65V and
1.2V, the INTV CC regulator and internal circuitry power up
but the driver outputs remain low.
TOPSIDE MOSFET DRIVER SUPPLY
An external bootstrap capacitor, C B , connected from the
BOOST pin to the SW pin supplies the topside gate driver
as shown in Figure 1. Capacitor C B is charged though the
external diode, D B , from INTV CC when the SW pin is low.
When the topside MOSFET is turned on, the top driver
places the C B voltage across the gate source of the top
MOSFET. This enhances the MOSFET and turns on the
top switch. The switch node voltage, SW, rises to V IN and
the BOOST pin follows. With the topside MOSFET on, the
boost voltage is above the input supply:
V BOOST = V IN + V INTVCC
The value of the boost capacitor, C B , needs to be at least
100 times that of the total input capacitance of the topside
MOSFET. The reverse breakdown of the external Schottky
diode, D B , must be greater than V IN(MAX) .
IMVP-6/IMVP-6.5 SELECTION AND V BOOT VOLTAGE
The LTC3816 can be configured to meet either IMVP-6
or IMVP-6.5 requirements. To select IMVP-6 operation,
short both I MON and PREI MON to INTV CC . At start-up, when
VR ON is asserted, the switcher output ramps to V BOOT =
1.2V regardless of the VID code. To configure IMVP-6.5
operation, connect a resistor from I MON to V SS(SEN) and
another resistor from PREI MON to I TC . The I MON and
PREI MON resistance set the I MON gain (see the I MON sec-
tion). The V BOOT voltage for IMVP-6.5 is 1.1V.
SOFT-START OPERATION
The start-up of V OUT is controlled by the LTC3816’s SS
pin. When the voltage at the SS pin is less than 1.3V, the
LTC3816 regulates the V FB voltage to the SS pin voltage
instead of 1.3V. This allows the user to program the soft-
start of the regulator output with a capacitor from the SS
pin to GND. An internal 1μA current source charges this
capacitor, creating a voltage ramp on the SS pin. As the
SS pin voltage rises from 0V to 1.3V, the output voltage,
V OUT , rises smoothly from 0V to its V BOOT value. Once
the soft-start interval is over, the internal current source
continues charging the SS capacitor until the SS poten-
tial is internally clamped at about 2.7V. For the IMVP-6
configuration, a 1000pF SS capacitor generates roughly
a 1.6ms start-up time. With the IMVP-6.5 configuration,
the start-up time is about 1.5ms.
During severe overload conditions, the LTC3816 discharges
the SS capacitor to lower the switcher output voltage. If the
potential at SS is forced below 0.3V, the controller reduces
its I MAX sourcing current from 10μA to 2.5μA and cuts the
short-circuit current to about 25% of its nominal value.
CURRENT SENSE AND CURRENT LIMIT
The LTC3816 features an onboard cycle-by-cycle user-
programmable current limit circuit that controls the peak
inductor current. The I MAX pin has an internal 10μA pull-
up current source, allowing the maximum load current
I LOAD(MAX) to be programmed by a single external resistor
R IMAX connected between the I MAX and I SENN pins.
I IMAX ? R IMAX
R SENSE
2 R SENSE 2
where I L(PEAK) is the peak inductor current, I IMAX is the I MAX
pin pull-up current, R SENSE is the current sense resistor
value and ? I L is the inductor ripple current.
1 ? V ?
f OSC ? L ? V IN ?
Note that the output ripple current varies with the switch-
ing frequency, inductor value and duty cycle. Hence, the
current limit value should be checked on the application
board to ensure that I LOAD(MAX) < I LIMIT under all operating
conditions and temperature variations.
For current sensing using a low value sense resistor, the
sense resistor parasitic inductance must be considered to
3816f
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