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参数资料
| 型号： | MAX17075ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV W/CHRG PUMP 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 4mA |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
Reference Voltage (REF)
The reference voltage is nominally 1.25V, and can
source at least 50μA (see the Typical Operating
Characteristics). V CC is the input of the internal refer-
ence block. Bypass REF with a 0.22μF ceramic capaci-
tor connected between REF and AGND.
Power-Up Sequence and Soft-Start
Once the voltage on V CC exceeds the XAO UVLO
threshold of approximately 1.5V, the reference turns on.
With a 0.22μF REF bypass capacitor, the reference
reaches its regulation voltage of 1.25V in approximately
1ms. When the reference voltage exceeds 1V and V CC
exceeds its UVLO threshold of approximately 2.25V,
the IC enables the main step-up regulator, the gate-on
linear-regulator controller, and the gate-off linear-
regulator controller simultaneously.
The IC employs soft-start for each regulator to minimize
inrush current and voltage overshoot and to ensure a
When the input voltage falls below the UVLO falling
threshold, the controller turns off the main step-up regu-
lator and disables the switch-control block; the opera-
tional amplifier output is high impedance.
Fault Protection
During steady-state operation, if the output of the main
regulator or any of the linear-regulator outputs exceed
their respective fault-detection thresholds, the
MAX17075 activates an internal fault timer. If any condi-
tion or combination of conditions indicates a continuous
fault for the fault-timer duration (50ms typ), the
MAX17075 sets the fault latch to shut down all the out-
puts except the reference. Once the fault condition is
removed, cycle the input voltage (below the UVLO
falling threshold) to clear the fault latch and reactivate
the device. The fault-detection circuit is disabled during
the soft-start time.
well-defined startup behavior. Each output uses a 7-bit
soft-start DAC. For the step-up and the gate-on linear
regulator, the DAC output is stepped in 128 steps from
zero up to the reference voltage. For the gate-off linear
regulator, the DAC output steps from the reference
down to 250mV in 128 steps. The soft-start duration is
10ms (typ) for step-up regulator and 3ms (typ) for gate-
on and gate-off regulators.
A capacitor (C DEL ) from DEL to AGND determines the
switch-control-block startup delay. After the input volt-
age exceeds the UVLO threshold (2.25V typ) and the
soft-start routine for each regulator is complete and
there is no fault detected, a 5mA current source starts
charging C DEL . Once the capacitor voltage exceeds
1.25V (typ), the switch-control block is enabled as
shown in Figure 8. After the switch-control block is
enabled, COM can be connected to SRC or DRN
through the internal p-channel switches, depending
upon the state of CTL. Before startup and when V IN is
less than UVLO, DEL is internally connected to AGND
to discharge C DEL . Select C DEL to set the delay time
using the following equation:
2.25V
1.5V
1V
14ms
3ms
SOFT-START
SOFT-START
VVCC
VREF
VAVDD
VCOM
VPOUT
C DEL = DELAY _ TIME ×
5 μA
1 . 25 V
1.25V
VGOFF
VDEL
Undervoltage Lockout (UVLO)
The UVLO circuit compares the input voltage at V CC
with the UVLO threshold (2.25V rising, 2.20V falling, typ)
to ensure the input voltage is high enough for reliable
operation. The 50mV (typ) hysteresis prevents supply
transients from causing a restart. Once the input voltage
exceeds the UVLO rising threshold, startup begins.
INPUT
VOLTAGE
OK
SOFT-START BEGINS
SWITCH
CONTROL
ENABLED
VGON
Figure 8. Power-Up Sequence
Maxim Integrated
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17075EVKIT+ | 功能描述:电源管理IC开发工具 MAX17075 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17077AETM+ | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX17077AETM+T | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX17077AETM+W | 制造商:Maxim Integrated Products 功能描述:INTERNAL-SWITCH BOOST REGULATOR - Rail/Tube |
| MAX17077ETM+ | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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