参数资料
| 型号： | ISL78213ARZ |
| 厂商： | Intersil |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16VQFN |
| 标准包装： | 75 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.8 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-QFN（4x4） |
ISL78213
CLOCK
PWM
8 CYCLES
PFM
PFM CURRENT LIMIT
I L
LOAD CURRENTT
0
NOMINAL +1.5%
V OUT
NOMINAL
FIGURE 37. SKIP MODE OPERATION WAVEFORMS
PG
During power-up, the open-drain power good output holds low for
about 1ms after V OUT reaches the regulation voltage. The PG
output also serves as a 1ms delayed the Power Good signal when
the pull-up resistor R 1 is installed.
UVLO
When the input voltage is below the undervoltage lock-out (UVLO)
threshold, the regulator is disabled.
Soft Start-Up
The soft-start-up reduces the inrush current during the start-up. The
soft-start block outputs a ramp reference to the input of the error
amplifier. This voltage ramp limits the inductor current as well as the
output voltage speed so that the output voltage rises in a controlled
fashion. When VFB is less than 0.2V at the beginning of the soft-start,
the switching frequency is reduced to 1/3 of the nominal value so that
the output can start-up smoothly at light load condition. During
soft-start, the IC operates in the SKIP mode to support pre-biased
output condition.
Enable
The enable (EN) input allows the user to control turning on or off
dropout voltage under the 100% duty-cycle operation is the
product of the load current and the ON-resistance of the
P-MOSFET.
Thermal Shut-Down
The ISL78213 has built-in thermal protection. When the internal
temperature reaches +140°C, the regulator is completely
shutdown. As the temperature drops to +115°C, the ISL78213
resumes operation by stepping through the soft-start.
Applications Information
Output Inductor and Capacitor Selection
To consider steady state and transient operations, ISL78213
typically uses a 1.5μH output inductor. The higher or lower
inductor value can be used to optimize the total converter system
performance. For example, for higher output voltage 3.3V
applications, in order to decrease the inductor current ripple and
output voltage ripple, the output inductor value can be increased.
It is recommended to set the ripple inductor current
approximately 30% of the maximum output current for optimized
performance. The inductor ripple current can be expressed as
shown in Equation 1:
V O ? ? 1 – --------- ?
L ? f S
the regulator for purposes such as power-up sequencing. When
the regulator is enabled, there is typically a 600μs delay for
waking up the bandgap reference and then the soft-start-up
begins.
? V O ?
? V IN ?
Δ I = -------------------------------------
(EQ. 1)
Discharge Mode (Soft-Stop)
When a transition to shutdown mode occurs or the V IN UVLO is
set, the outputs discharge to GND through an internal 100 Ω
switch.
Power MOSFETs
The power MOSFETs are optimized for best efficiency. The
ON-resistance for the P-MOSFET is typically 50m Ω and the
ON-resistance for the N-MOSFET is typically 50m Ω ..
100% Duty Cycle
The ISL78213 features 100% duty cycle operation to maximize
the battery life. When the battery voltage drops to a level that the
ISL78213 can no longer maintain the regulation at the output,
the regulator completely turns on the P-MOSFET. The maximum
14
The inductor’s saturation current rating needs to be at least
larger than the peak current. The ISL78213 protects the typical
peak current 4.8A. The saturation current needs be over 5.5A for
maximum output current application.
ISL78213 uses an internal compensation network and the
output capacitor value is dependent on the output voltage. The
ceramic capacitor is recommended to be X5R or X7R. The
recommended X5R or X7R minimum output capacitor values are
shown in Table 1. In Table 1, the minimum output capacitor value
is given for the different output voltage to make sure that the
whole converter system is stable. Additional output capacitance
should be added for better performances in applications where
high load transient or low output ripple is required. It is
recommended to check the system level performance along with
the simulation model.
FN7550.2
December 4, 2013
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