参数资料
| 型号： | ISL78213ARZ |
| 厂商： | Intersil |
| 文件页数： | 12/16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
Typical Operating Performance Unless otherwise noted, operating conditions are: T A = +25°C, V VIN = 2.5V to 5.5V,
EN = V IN , SYNCH = 0V, L = 1.5μH, C 1 = 2x22μF, C 2 = 2x22μF, I OUT = 0A to 3A. (Continued)
LX 2V/DIV
PHASE 2V/DIV
V OUT 1V/DIV
V OUT 0.5V/DIV
FIGURE 33. OUTPUT SHORT CIRCUIT
5.000
4.875
4.750
4.625
4.500
4.375
4.250
4.125
IL 2A/DIV
PG 5V/DIV
OCP_3.3V IN
OCP_5V IN
IL 2A/DIV
PG 5V/DIV
FIGURE 34. OUTPUT SHORT CIRCUIT RECOVERY
4.000
-50
-25
0
25
50
75
100
TEMPERATURE (°C)
FIGURE 35. OUTPUT CURRENT LIMIT vs TEMPERATURE
Theory of Operation
The ISL78213 is a step-down switching regulator optimized for
battery-powered handheld applications. The regulator operates at
1MHz fixed switching frequency under heavy load conditions to
allow smaller external inductors and capacitors to be used for
minimal printed-circuit board (PCB) area. At light load, the regulator
reduces the switching frequency, unless forced to the fixed
frequency, to minimize the switching loss and to maximize the
battery life. The quiescent current, when the output is not loaded, is
typically only 35μA. The supply current is typically only 0.1μA when
the regulator is shutdown.
PWM Control Scheme
Pulling the SYNCH pin HI (>2.5V) forces the converter into PWM
mode, regardless of output current. The ISL78213 employs the
current-mode pulse-width modulation (PWM) control scheme for
fast transient response and pulse-by-pulse current limiting. Figure 2
shows the block diagram. The current loop consists of the oscillator,
the PWM comparator, current sensing circuit and the slope
compensation for the current loop stability. The gain for the current
sensing circuit is typically 250mV/A. The control reference for the
current loops comes from the error amplifier's (EAMP) output.
12
The PWM operation is initialized by the clock from the oscillator.
The P-Channel MOSFET is turned on at the beginning of a PWM
cycle and the current in the MOSFET starts to ramp up. When the
sum of the current amplifier CSA and the slope compensation
(237mV/μs) reaches the control reference of the current loop, the
PWM comparator COMP sends a signal to the PWM logic to turn
off the P-MOSFET and turn on the N-Channel MOSFET. The
N-MOSFET stays on until the end of the PWM cycle. Figure 36
shows the typical operating waveforms during the PWM operation.
The dotted lines illustrate the sum of the slope compensation
ramp and the current-sense amplifier’s CSA output.
The output voltage is regulated by controlling the V EAMP voltage
to the current loop. The bandgap circuit outputs a 0.8V reference
voltage to the voltage loop. The feedback signal comes from the
VFB pin. The soft-start block, only affects the operation during
the start-up and will be discussed separately. The error amplifier
is a transconductance amplifier that converts the voltage error
signal to a current output. The voltage loop is internally
compensated with the 27pF and 390k Ω RC network. The
maximum EAMP voltage output is precisely clamped to 1.6V.
FN7550.2
December 4, 2013
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| ISL78214 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:4A Low Quiescent Current High Efficiency Synchronous Buck Regulator |
| ISL78214ARZ | 功能描述:IC REG BUCK SYNC ADJ 4A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
| ISL78214ARZ-T | 功能描述:IC REG BUCK SYNC ADJ 4A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
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