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参数资料
| 型号： | MAX1962EEP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.12MHz |
| 占空比： | 90% |
| 电源电压： | 2.35 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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2.35V to 5.5V, 0.5% Accurate, 1MHz PWM
Step-Down Controllers with Voltage Margining
Operating Frequency and Synchronization
The MAX1960/MAX1961/MAX1962 operating frequency
is set externally to either 500kHz or 1MHz. For 500kHz
operation, connect FSET/SYNC to GND, or for 1MHz
operation, connect FSET/SYNC to V DD . Alternately, an
external clock from 450kHz to 1.2MHz can be applied
to SYNC.
A clock output (CLKOUT) that is 180° out-of-phase with
the internal clock is also provided. This allows a second
converter to be synchronized, and operate 180° out-of-
phase with the first. To do this, simply connect CLKOUT
of the first converter to FSET/SYNC of the second con-
verter. The first converter can be set internally to 500kHz
or 1MHz for this mode of operation. When the first con-
increases until it reaches its maximum value, where the
part enters dropout. With a switching frequency of
1MHz, the maximum duty cycle is about 83%. At
500kHz, the duty cycle can increase to about 92%,
resulting in a lower dropout voltage. The duty cycle is
dependent on the input voltage (V IN ), the output volt-
age (V OUT ), and the parasitic voltage drops in the
MOSFETs and the inductor (V DROP(N1) , V DROP(N2) ,
V DROP(L) ). Note that V DROP(L) includes the voltage
drop due to the inductor’s resistance, the drop across
the current-sense resistor (if used), and any other resis-
tive voltage drop from the LX switching node to the
point where the output voltage is sensed. The duty
cycle is found from:
verter is synchronized to an external clock, CLKOUT is
the inverse of external clock. See the SYNC Timing
Waveform in the Typical Operating Characteristics.
D =
V OUT + V DROP ( L )
V IN - V DROP ( N 1 ) - V DROP ( N 2 )
Lossless Current Limit
(MAX1960/MAX1961)
To prevent damage in the case of excessive load cur-
rent or a short circuit, the MAX1960/MAX1961 use the
low-side MOSFET’s on-resistance (R DS(ON) ) for current
sensing. The current is monitored during the on-time of
the low-side MOSFET. If the current-sense voltage
(V PGND - V LX ) rises above the current-limit threshold for
more than 128 clock cycles, the controller turns off. The
controller remains off until the input voltage is removed
or the device is re-enabled with CTL1 and CTL2 (see
the Setting the Current Limit section).
Current-Sense Resistor (MAX1962)
The MAX1962 uses a standard current-sense resistor in
series with the inductor for a 10% accurate current-limit
measurement. The current-sense threshold is 50mV. This
provides accurate current sensing at all duty cycles with-
out relying on MOSFET on-resistance. CS connects to
the high-side (inductor side) of the current-sense resistor
and OUT connects to the low-side (output side) of the
current-sense resistor.
The current-sense resistor for the MAX1962 may also be
replaced with a series RC network across the inductor.
This method uses the parasitic resistance of the inductor
for current sensing. This method is less accurate than
using a current-sense resistor, but is lower cost and pro-
vides slightly higher efficiency. See the Design
Procedure section for instructions on using this method.
Dropout Performance
The MAX1960/MAX1961/MAX1962 enter dropout when
the input voltage is not sufficiently high to maintain output
regulation. As input voltage is lowered, the duty cycle
Adaptive Dead Time
The MAX1960/MAX1961/MAX1962 DL and DH MOSFET
drivers have an adaptive dead-time circuit to prevent
shoot-through current caused by high- and low-side
MOSFET overlap. This allows a wide variety of MOSFETs
to be used without matching FET dynamic characteris-
tics. The DL driver will not go high until DH drives the
high-side MOSFET gate to within 1V of its source (LX).
The DH output will not go high until DL drives the low-side
MOSFET gate to within 1V of ground.
Design Procedure
Component selection is primarily dictated by the following
criteria:
Input voltage range. The maximum value
(V IN(MAX) ) must accommodate the worst-case high
input voltage. The minimum value (V IN(MIN) ) must
account for the lowest input voltage after drops due
to connectors, fuses, and selector switches are con-
sidered.
Maximum load current. There are two values to con-
sider: The peak load current (I LOAD(MAX) ) determines
the instantaneous component stresses and filtering
requirements and is key in determining output capac-
itor requirements. I LOAD(MAX) also determines the
inductor saturation rating and the design of the cur-
rent-limit circuit. The continuous load current (I LOAD )
determines the thermal stresses and is key in deter-
mining input capacitor requirements, MOSFET
requirements, as well as those of other critical heat-
contributing components.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1962EEP+ | 功能描述:DC/DC 开关控制器 1MHz PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1962EEP+T | 功能描述:DC/DC 开关控制器 1MHz PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1962EEP-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1963AETT120+T | 功能描述:低压差稳压器 - LDO Low Input Voltage 300mA LDO Regulators with RESET in SOT and TDFN 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 |
| MAX1963AETT150+T | 功能描述:低压差稳压器 - LDO Low-Input-Voltage 300mA LDO Regulators with RESET in SOT and TDFN 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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