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| 型号： | ISL8013IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16QFN |
| 产品培训模块： | ISL8013/4 Synchronous Buck Regulators |
| 标准包装： | 1 |
| 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： | 2.7 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 ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（4x4） |
| 产品目录页面： | 1248 (CN2011-ZH PDF) |
| 其它名称： | ISL8013IRZ-TDKR |
ISL8013
.
CLOCK
I L
0
PWM
8 CYCLES
PFM
PFM CURRENT LIMIT
LOAD CURRENTT
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.
Soft Start-Up
bandgap reference and then the soft-start-up begins. It
is recommended that the EN voltage should be kept logic
low (less than 400mV), until V IN reaches 2.5V. Refer to
Figures 38 and 39 for suggested circuit implementation
with V IN slew rate.
VIN
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
2.5V
EN
R 5 ? ( V IN – 1.4V )
R 4 = ---------------------------------------------
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.
UVLO
When the input voltage is below the undervoltage
lock-out (UVLO) threshold, the regulator is disabled. To
adjust the voltage level of power on and UVLO, use a
resistive divider across EN. The input voltage
programming resistor R 4 will depend on the bottom
resistor R 5 , as referred to in Figure 38. The value of R 5 is
typically between 10k Ω and 100k Ω .
V IN
R4
<400mV
T t (TIME)
FIGURE 39. CIRCUIT IMPLEMENTATION WITH V IN
SLEW RATE
Let T equal the rise time of V IN . Select the ratio of R 5 and
R 4 such that the voltage is 1.4V (minimum enable logic
high threshold) when V IN is equal to or greater than
2.5V. Set R 5 between 10k Ω to 100k Ω , and use Equation 1
to determine R 4 :
(EQ. 1)
1.4V
Where V IN is greater than or equal to 2.5V.
Then select C such that the equivalent time constant is at
least 2x the rise time, T. This will delay the EN voltage
enough so that the overall EN voltage is less than 400mV
by the time V IN reaches 2.5V. Use Equation 2 to get C:
C ≥ --------------------
EN
1V
R5
C
2 ? T
R 4 || R 5
(EQ. 2)
Where T is the rise time of V IN
FIGURE 38. EXTERNAL RESISTOR DIVIDER
Enable
The enable (EN) input allows the user to control the
turning on or off the regulator for purposes such as
power-up sequencing. When the regulator is enabled,
there is typically a 600μs delay for waking up the
14
As an example, let V IN = 5V with rise time, T = 10ms.
Then R 4 = 56.2k Ω , R 5 = 71.5k Ω , and C = 0.68μF are
used to insure that V IN was >2.5V and the EN voltage
was <400mV.
Discharge Mode (Soft-Stop)
When a transition to shutdown mode occurs or the VIN
UVLO is set, the outputs discharge to GND through an
internal 100 Ω switch.
FN6309.3
November 23, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL8013IRZ-TS2715 | 制造商:Intersil Corporation 功能描述:S SPEC FOR TRACKING BROADCOM BUSINESS ONLY-SOLD THRU DISTI - Tape and Reel |
| ISL8014 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:4A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator |
| ISL8014A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:4A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator |
| ISL8014AEVAL2Z | 功能描述:EVAL BOARD 2 FOR ISL8014A RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL8014AIRZ | 功能描述:直流/直流开关调节器 4A LW QUIESCENT CUR 1 6MHZ 4X4 16LD RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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