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| 型号： | EL7536EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR EL7536 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 1A |
| 输入电压： | 2.5 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | EL7536 |
EL7536
Applications Information
Product Description
The EL7536 is a synchronous, integrated FET 1A step-down
regulator which operates from an input of 2.5V to 6V. The
output voltage is user-adjustable with a pair of external
resistors.
The internally-compensated controller makes it possible to
use only two ceramic capacitors and one inductor to form a
complete, very small footprint 1A DC:DC converter.
Start-Up and Shut-Down
When the EN pin is tied to V IN , and V IN reaches
approximately 2.4V, the regulator begins to switch. The
output voltage is gradually increased to ensure proper soft-
start operation.
When the EN pin is connected to a logic low, the EL7536 is
in the shut-down mode. All the control circuitry and both
MOSFETs are off, and V OUT falls to zero. In this mode, the
total input current is less than 1μA.
When the EN reaches logic HI, the regulator repeats the
start-up procedure, including the soft-start function.
PWM Operation
In the PWM mode, the P channel MOSFET and N channel
MOSFET always operate complementary. When the
PMOSFET is on and the NMOSFET off, the inductor current
increases linearly. The input energy is transferred to the
output and also stored in the inductor. When the P channel
MOSFET is off and the N channel MOSFET on, the inductor
current decreases linearly, and energy is transferred from
Where RL is the DC resistance on the inductor and R DSON1
the PFET on-resistance, nominal 70m Ω at room temperature
with tempco of 0.2m Ω /°C.
As the input voltage drops gradually close or even below the
preset V O , the converter gets into 100% duty ratio. At this
condition, the upper PFET needs some minimum turn-off
time if it is turned off. This off-time is related to input/output
conditions. This makes the duty ratio appears randomly and
increases the output ripple somewhat until the 100% duty
ratio is reached. Larger output capacitor could reduce the
random-looking ripple. Users need to verify if this condition
has adverse effect on overall circuit if close to 100% duty
ratio is expected.
RSI/POR Function
When powering up, the open-collector Power-On-Reset
output holds low for about 100ms after V O reaches the
preset voltage. When the active-HI reset signal RSI is
issued, POR goes to low immediately and holds for the
same period of time after RSI comes back to LOW. The
output voltage is unaffected. (Please refer to the timing
diagram). When the function is not used, connect RSI to
ground and leave open the pull-up resister R 4 at POR pin.
The POR output also serves as a 100ms delayed Power
Good signal when the pull-up resister R 4 is installed. The
RSI pin needs to be directly (or indirectly through a resister
R 6 ) connected to Ground for this to function properly.
V O
the inductor to the output. Hence, the average current
through the inductor is the output current. Since the inductor
and the output capacitor act as a low pass filter, the duty
RSI
MIN
25ns
cycle ratio is approximately equal to V O divided by V IN .
POR
100ms
100ms
The output LC filter has a second order effect. To maintain
V O = 0.8 × ? 1 + ------- ?
the stability of the converter, the overall controller must be
compensated. This is done with the fixed internally
compensated error amplifier and the PWM compensator.
Because the compensations are fixed, the values of input
and output capacitors are 10μF to 22μF ceramic. The
inductor is nominally 1.8μH, but 1.5μA to 2.2μH can be used.
100% Duty Ratio Operation
EL7536 utilizes CMOS power FET's as the internal
synchronous power switches. The upper switch is a PMOS
and lower switch a NMOS. This not only saves a boot
capacitor, it also allows 100% turn-on of the upper PFET
switch, achieving V O close to V IN . The maximum achievable
V O is,
V O = V IN – ( R L + R DSON1 ) × I O
7
FIGURE 14. RSI & POR TIMING DIAGRAM
Output Voltage Selection
Users can set the output voltage of the converter with a
resister divider, which can be chosen based on the following
formula:
? R 2 ?
? R 1 ?
Component Selection
Because of the fixed internal compensation, the component
choice is relatively narrow. We recommend 10μF to 22μF
multi-layer ceramic capacitors with X5R or X7R rating for
both the input and output capacitors, and 1.5μH to 2.2μH
inductance for the inductor.
FN7396.8
July 13, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7536IY | 功能描述:IC REG BUCK SYNC ADJ 1A 10MSOP RoHS:否 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 |
| EL7536IY-T13 | 功能描述:IC REG BUCK SYNC ADJ 1A 10MSOP RoHS:否 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:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| EL7536IY-T7 | 功能描述:IC REG BUCK SYNC ADJ 1A 10MSOP RoHS:否 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:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR |
| EL7536IYZ | 功能描述:直流/直流开关调节器 EL7536IYZ 1 AMP STP- DWNG 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 |
| EL7536IYZS2695 | 制造商:Intersil Corporation 功能描述:S SPEC FOR TRACKING ONLY, USE D3W PL - Rail/Tube |
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