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| 型号： | MAX8969EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT STEP-UP 1A 3MHZ MAX8969 |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | True Shutdown™ |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 电流 - 输出： | 1A |
| 输入电压： | 2.5 V ~ 5.5 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 3MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX8969 |
MAX8969
Step-Up Converter
for Handheld Applications
OUT_
MAX8969
C OUT
22μF
C IN
4.7μF
IN
REFERENCE
RAMP
IN
GENERATOR
ATM
COMPARATOR
0.95 x
V OUT_TARGET
IN
CONTROL
LOGIC
ATM
TRACK
ENABLE
PWM
LOGIC
P1
N1
TRUE
SHUTDOWN
TREN
EN
CURRENT
LIMIT
Figure 1. Functional Diagram
L1
1μH
GND_
LX_
Detailed Description
The MAX8969 is a step-up DC-DC switching converter
that utilizes a fixed-frequency PWM architecture with
True Shutdown. With an advanced voltage-positioning
control scheme and high 3MHz switching frequency, the
IC is inexpensive to implement and compact, using only
a few small easily obtained external components. Under
light-load conditions, the IC switches only when needed,
consuming only 45 F A (typ) of quiescent current. The IC
is highly efficient with an internal switch and synchronous
rectifier. Shutdown typically reduces the quiescent current
to 1 F A (typ). Low quiescent current and high efficiency
make this device ideal for powering portable equipment.
Internal soft-start limits inrush current to less than 720mA
(typ), while output voltage is less than input voltage. Once
output voltage approaches input voltage approaches
input voltage after a brief delay, output voltage is boosted
to its final value at a rate of approximately 25mV/μs.
Maxim Integrated
During this period, as well as being limited by the volt-
age, ramp rate current is limited by the normal 2.6A boost
mode current limit.
In boost mode, the step-up converter boosts to
V OUT_TARGET from battery input voltages ranging from
2.5V to V OUT_TARGET . When the input voltage ranges
from 0.95 x V OUT_TARGET to 5.5V, the IC enters ATM and
the output voltage approximately follows the input volt-
age. During boost mode, the input current limit is set to
2.6A to guarantee delivery of the rated out current (e.g.,
1A output current when boosting from a 2.5V input supply
to a 3.7V output).
Control Scheme
The step-up converter uses a load/line control scheme.
The load/line control scheme allows the output voltage
to sag under load, but prevents overshoot when the
load is suddenly removed. The load/line control scheme
reduces the total range of voltages reached during
transients at the expense of DC output impedance.
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8969EVKIT# | 功能描述:EVAL KIT STEP-UP 1A 3MHZ MAX8969 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:True Shutdown™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| MAX8969EWL33+ | 制造商:Maxim Integrated Products 功能描述:1A BOOST CONVERTER WITH TRACK MODE IN A TINY WLP PACKAGE - Rail/Tube |
| MAX8969EWL33+T | 功能描述:直流/直流开关转换器 1A Boost Converter with Track mode RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8969EWL35+T | 功能描述:直流/直流开关转换器 600mA Boost Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8969EWL37+T | 功能描述:直流/直流开关转换器 1A Boost Converter with Track mode RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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