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| 型号： | MAX1759EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 0.1A 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），切换电容（充电泵） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，2.5 V ~ 5.5 V |
| 输入电压： | 1.6 V ~ 5.5 V |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 100mA |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
| 其它名称： | Q1143368 |
Buck/Boost Regulating
Charge Pump in μMAX
Detailed Description
The MAX1759 ’s unique charge-pump architecture
0.33 μ F
allows the input voltage to be higher or lower than the
IN
OUT
regulated output voltage. Internal circuitry senses V IN
and V OUT and determines whether V IN must be
+1.6V TO +5.5V
IN
CXN
CXP
OUT
3.3V AT 100mA
stepped up or stepped down to produce the regulated
output. When V IN is lower than V OUT , the charge pump
operates as a regulated step-up voltage doubler. When
V IN is higher than V OUT , the charge pump operates as
ON
10 μ F
MAX1759
100k
10 μ F
a step-down gated switch.
In voltage step-down mode (i.e., the input voltage is
OFF
SHDN
FB
GND PGND
POK
POWER OK
greater than the output voltage) with a light load, the
controller connects CXN to PGND, and shuttles charge
to the output by alternately connecting CXP from IN to
OUT (see Figures 1 and 2). Although V IN is greater than
V OUT , this scheme may not allow the MAX1759 to regu-
late the output under heavy loads. In this case, the
MAX1759 will automatically switch to step-up mode. In
step-up mode, the output is kept in regulation by modu-
lating the charge delivered by the transfer capacitor
(C X ) to the load (see Figure 2). When lightly loaded, the
charge pump switches only as necessary to supply the
load, resulting in low quiescent current. Output voltage
ripple does not increase with light loads.
Shutdown Mode
Driving SHDN low places the MAX1759 in shutdown
mode. This disables the charge-pump switches, oscil-
lator, and control logic, reducing quiescent current to
1μA. The output is high impedance in shutdown and is
disconnected from the input. The POK output is high
impedance in shutdown.
Undervoltage Lockout
The MAX1759 undervoltage lockout feature deactivates
the device when the input voltage falls below 1V.
Power-OK Output
POK is an open-drain output that sinks current when
the regulator feedback voltage falls below 1.1V. The
feedback voltage can be either the internal resistor-
divider feedback voltage when in fixed output mode
(FB tied to GND) or an external feedback voltage from
an external resistive divider in adjustable output mode.
A 10k ? to 1M ? pull-up resistor from POK to OUT may
be used to provide a logic output. Connect POK to GND
or leave unconnected if not used.
Soft-Start and Short-Circuit Protection
The MAX1759 features foldback short-circuit protec-
tion. This circuitry provides soft-start by limiting inrush
current during startup and limits the output current to
110mA (typ) if the output is short-circuited to ground.
Figure 1. Typical Application Circuit
Thermal Shutdown
The MAX1759 features thermal shutdown with tempera-
ture hysteresis. When the die temperature exceeds
160°C, the device shuts down. When the die cools by
20°C, the MAX1759 turns on again. If high die tempera-
ture is caused by output overload and the load is not
removed, the device will turn off and on, resulting in a
pulsed output.
Design Procedure
Setting the Output Voltage
The MAX1759 dual-mode feedback controller selects
between the internally set 3.3V regulated output or an
external resistive divider that allows adjustment of the
output voltage from 2.5V to 5.5V. Connect FB to GND
for a regulated 3.3V output. For an adjustable output,
connect a resistive divider between OUT and GND. To
ensure feedback-loop stability and to minimize error due
to FB pin bias currents, the resistive divider current
should be approximately 15μA. In the following equa-
tion, choose R2 in the 50k ? to 100k ? range, and calcu-
late R1 from the following formula (Figure 3):
R1 = R2 [(V OUT / V FB ) - 1]
and
V OUT = V FB (R1 + R2) / R2
where V OUT is the desired output voltage from 2.5V to
5.5V, and V FB is the internal regulation voltage, nomi-
nally 1.235V.
The circuit of Figure 3 generates a regulated 2.5V, using
external standard 1% resistor values. Surface-mount
resistors should be placed close to the MAX1759, less
than 5mm away from FB (see the PC Board Layout
section).
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1759EUB+ | 功能描述:电荷泵 Buck/Boost Regulating RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1759EUB+T | 功能描述:电荷泵 Buck/Boost Regulating RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX1759EUB-T | 功能描述:电荷泵 Buck/Boost Regulating RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| MAX17600ASA+ | 功能描述:功率驱动器IC Dual MOSFET Drivers RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX17600ASA+T | 功能描述:功率驱动器IC Dual MOSFET Drivers RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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