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| 型号： | MAX1644EAE-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.1 V ~ 5.5 V |
| 输入电压： | 3 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 最高 350kHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SSOP |
2A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
__________________Design Procedure
For typical applications, use the recommended compo-
nent values in Table 1. For other applications, take the
following steps:
1) Select the desired PWM-mode switching frequency;
300kHz is a good starting point.
2) Select the constant-off-time as a function of input
voltage, output voltage, and switching frequency.
3) Select R TOFF as a function of off-time.
MAX1644
R1 = 50k Ω
LX
FB
R2
R1
V OUT
4) Select the inductor as a function of output voltage,
off-time, and peak-to-peak inductor current.
Table 1. Recommended Component
Values (I OUT = 2A, f PWM = 300kHz)
R2 = R1(V OUT / V REF - 1)
V REF = 1.1V
Figure 2. Adjustable Output Voltage
leave unconnected (3.3V output voltage). Internal resis-
R2 = R1 ? OUT ? 1 ?
V IN
(V)
5
5
5
5
3.3
3.3
3.3
V OUT
(V)
3.3
2.5
1.8
1.5
2.5
1.8
1.5
L
(μH)
6.0
6.8
6.8
6.0
3.3
4.7
4.7
R TOFF
(k Ω )
120
180
240
270
82
180
200
tor-dividers divide down the output voltage, regulating
the divided voltage to the internal reference voltage.
For output voltages other than 2.5V or 3.3V, or for
tighter AC load regulation, connect FBSEL to GND (1%
regulation) or to REF (2% regulation), and connect FB
to a resistor divider between the output voltage and
ground (Figure 2). Regulation is maintained for
adjustable output voltages when V FB equals V REF . Use
50k Ω for R1. R2 is given by the equation:
? V ?
? V REF ?
Table 2. Output Voltage and AC Load-
Regulation Selection
where V REF is typically 1.1V.
Programming the Switching Frequency
PIN
OUTPUT
AC LOAD-
and Off-Time
( V IN – V OUT ? V PMOS )
f PWM ( V IN ? V PMOS + V NMOS )
FBSEL
V CC
Unconnected
REF
GND
FB
Output
Voltage
Output
Voltage
Resistor
Divider
Resistor
Divider
VOLTAGE
(V)
2.5
3.3
Adjustable
Adjustable
REGULATION
ERROR (%)
2
2
2
1
The MAX1644 features a programmable PWM mode
switching frequency, which is set by the input and out-
put voltage and the value of R TOFF , connected from
TOFF to GND. R TOFF sets the PMOS power switch off-
time in PWM mode. Use the following equation to select
the off-time according to your desired switching fre-
quency in PWM mode (I OUT > 0.2A):
t OFF =
Setting the Output Voltage
The output of the MAX1644 is selectable between one
of two preset output voltages: (2.5V or 3.3V) with a 2%
AC load-regulation error, or an adjustable output volt-
age from the reference voltage (nominally 1.1V) up to
V IN with a 1% or 2% AC load-regulation error. For a
preset output voltage, connect FB to the output voltage,
and connect FBSEL to V CC (2.5V output voltage) or
where:
t OFF = the programmed off-time
V IN = the input voltage
V OUT = the output voltage
V NMOS = the voltage drop across the internal
PMOS power switch
V PMOS = the voltage drop across the internal
NMOS synchronous-rectifier switch
8
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相关代理商/技术参数 |
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| MAX1644EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1644 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 |
| MAX1645AEEI | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1645AEEI+T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1645AEEI-T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1645AEVSYS | 制造商:Maxim Integrated Products 功能描述:KIT PKG - Bulk |
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