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参数资料
| 型号： | MIC22600YTSE |
| 厂商： | Micrel Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 24TSSOP |
| 标准包装： | 62 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.7V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-EPAD-TSSOP |
| 其它名称： | MIC22600YTSE-ND |
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Micrel, Inc.
The integration of one pole-zero pair within the control
loop greatly simplifies compensation. The optimum
values for C COMP (in series with a 20k resistor) are shown
below.
MIC22600
PWM control provides fixed-frequency operation. By
maintaining a constant switching frequency, predictable
fundamental and harmonic frequencies are achieved.
Sequencing and Tracking
L
22-47μF
C
47μF-
100μF
100μF-
470μF
The MIC22600 provides additional pins to provide
up/down sequencing and tracking capability for
connecting multiple voltage regulators together.
* VOUT > 1.2V, VOUT > 1V
0.47μH 0*-10pF
2.2μH 15-33pF
?
1μH 0 ? -15pF
22pF
15-22pF
33-47pF
33pF
33pF
100-220pF
EN/DLY Pin
The EN pin contains a trimmed, 1μA current source
which can be used with a capacitor to implement a fixed
desired delay in some sequenced power systems. The
R2 =
? 1 ? ?
? ?
matched at T POR =
Table1. Compensation Capacitor Selection
Feedback
The MIC22600 provides a feedback pin to adjust the
output voltage to the desired level. This pin connects
internally to an error amplifier. The error amplifier then
compares the voltage at the feedback to the internal
0.7V reference voltage and adjusts the output voltage to
maintain regulation. The resistor divider network for a
desired V OUT is given by:
R1
? V OUT ?
? V REF ?
where V REF is 0.7V and V OUT is the desired output
voltage. A 10k ? or lower resistor value from the output
to the feedback is recommended since large feedback
resistor values increase the impedance at the feedback
pin, making the feedback node more susceptible to
noise pick-up. A small capacitor (50pF – 100pF) across
the lower resistor can reduce noise pick-up by providing
a low impedance path to ground.
PWM Operation
The MIC22600 is a voltage mode, pulse width
modulation (PWM) controller. By controlling the duty
cycle, a regulated DC output voltage is achieved. As
load or supply voltage changes, so does the duty cycle
to maintain a constant output voltage. In cases where
the input supply runs into a dropout condition, the
MIC22600 will run at 100% duty cycle.
The MIC22600 provides constant switching at 1MHz with
synchronous internal MOSFETs. The internal MOSFETs
include a high-side P-Channel MOSFET from the input
supply to the switch pin and an N-Channel MOSFET
from the switch pin-to-ground. Since the low-side N-
Channel MOSFET provides the current during the off
cycle, a freewheeling Schottky diode from the switch
node-to-ground is not required.
threshold level for power on is 1.24V with a hysteresis of
20mV.
DELAY Pin
The DELAY pin also has a 1μA trimmed current source
and a 1μA current sink which acts with an external
capacitor to delay the operation of the Power On Reset
(POR) output. This can be used also in sequencing
outputs in a sequenced system, but with the addition of a
conditional delay between supplies; allowing a first up,
last down power sequence.
After EN is driven high, V OUT will start to rise (rate
determined by RC capacitor). As the FB voltage goes
above 90% of its nominal set voltage, DELAY begins to
rise as the 1μA source charges the external capacitor.
When the threshold of 1.24V is crossed, POR is
asserted high and DELAY continues to charge to a
voltage SV IN . When FB falls below 90% of nominal, POR
is asserted low immediately. However, if EN is driven
low, POR will fall immediately to the low state and
DELAY will begin to fall as the external capacitor is
discharged by the 1μA current sink. When the threshold
of ((V TP +1.24V)-1.24V) is crossed (V TP is the internal
voltage clamp, V TP -=0.9V), V OUT will begin to fall at a rate
determined by the RC capacitor. As the voltage change
in both cases is 1.24V, both rising and falling delays are
1.24 × C DLY
1.10 ? 6
RC Pin
The RC pin provides a trimmed 1μA current source/sink
similar to the DELAY Pin for accurate ramp up (soft
start) and ramp down control. This allows the MIC22600
to be used in systems requiring voltage tracking or ratio-
metric voltage tracking at startup.
There are two ways of using the RC pin:
1. Externally driven from a voltage source
2. Externally attached capacitor sets output ramp
up/down rate
June 2011
14
M9999-062411-D
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相关代理商/技术参数 |
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|---|---|
| MIC22600YTSE TR | 功能描述:直流/直流开关调节器 Not recommended for new designs; see MIC22705. MIC22600 = 1MHz 6A Integrated Switch Synchronous Buck Regulator 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 |
| MIC22601 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:4 MHz, 6A Integrated Switch Synchronous Buck Regulator |
| MIC22601YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:4 MHz, 6A Integrated Switch Synchronous Buck Regulator |
| MIC22601YML TR | 功能描述:直流/直流开关调节器 6A, 4MHz Integrated Switch Buck Regulator 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 |
| MIC22601YMLTR | 制造商:Micrel 功能描述:4MHz, 6A Integrated Sync Buck Regulator |
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