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参数资料
| 型号： | MAX8969EWL35+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 3.5V 1A 9WLP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.5V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 包装： | * |
| 供应商设备封装： | * |
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 |
|---|---|
| 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 |
| MAX8969EWL42+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 |
| MAX8969EWL50+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8969EWL50+T | 制造商:Maxim Integrated Products 功能描述:1A BOOST CONVERTER FOR LOW INPUT BATTERY TECHNOLOGIES - Tape and Reel |
| MAX896LESA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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