- 您现在的位置：买卖IC网 > PDF目录1836 > MAX15027ATB+T (Maxim Integrated Products)IC REG LDO ADJ 1A 10-TDFN PDF资料下载
参数资料
| 型号： | MAX15027ATB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1A 10-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.5 V ~ 3.3 V |
| 输入电压： | 1.43 V ~ 3.6 V |
| 电压 - 压降（标准）： | 0.075V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 电流 - 限制（最小）： | 1.4A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1412 (CN2011-ZH PDF) |
| 其它名称： | MAX15027ATB+TDKR |
1.425V to 3.6V Input, 1A Low-Dropout
Regulators with BIAS Input
Internal p-Channel Pass Transistor
The MAX15027/MAX15028 feature a 75m ? (typ)
p-channel MOSFET pass transistor. Unlike similar
designs using pnp pass transistors, p-channel MOSFETs
require no base drive, reducing quiescent current.
pnp-based regulators also waste considerable current
in dropout when the pass transistor saturates and use
high base-drive currents under large loads. The
MAX15027/MAX15028 do not suffer from these prob-
lems and consume only 275μA (typ) of quiescent cur-
rent under heavy loads, as well as in dropout.
Short-Circuit/
Thermal Fault Protection
The MAX15027/MAX15028 are fully protected from a
short circuit at the output through current limiting and
thermal-overload circuitry. In the fault condition when
the output is shorted to ground, the output current is
limited to a maximum of 2A. Under these conditions,
Shutdown Mode
The MAX15027/MAX15028 include an enable input. To
shut down the IC, drive EN low. In shutdown mode, the
current drawn by BIAS is less than 2μA. This feature is
extremely useful in an automotive application where the
BIAS input is derived from an always-on LDO expecting
to provide minimal dark current. For normal operation,
drive EN high or connect EN to IN (BIAS for MAX15028)
for continuous on operation. During shutdown, an inter-
nal 10k ? resistor is connected between OUT and GND.
Applications Information
Programming the Output Voltage
The MAX15027/MAX15028 feature an adjustable output
voltage from 0.5V to V IN using two external resistors
connected as a voltage-divider to FB as shown in
Figure 1. The output voltage is set by the following
equation:
V OUT = V FB ? 1 +
?
the device quickly heats up. When the junction temper-
ature reaches +165°C (typ), the thermal-overload cir-
cuitry turns off the output, allowing the part to cool
?
?
R 1 ?
R 2 ?
R 1 = R 2 ? OUT ? 1 ?
down. When the junction temperature cools to +150°C
(typ), the output turns back on and reestablishes regu-
lation. Current limiting and thermal protection continue
until the fault is removed. For continuous operation, do
not exceed the absolute maximum junction-tempera-
ture rating of T J = +150°C.
Soft-Start
The MAX15027/MAX15028 feature a soft-start function
that slowly ramps up the output voltage of the regulator
based on the value of the capacitor (C SS ) connected
where typically V FB = 0.5V. Choose R2 to be 10k ? . Or, to
optimize load-transient response for no load to full load
transients, use the resistor-divider as a minimum load
and choose R2 to be 500 ? . To simplify resistor selection:
? V ?
? V FB ?
from SS to GND. Upon power-up, C SS is charged with
a 5μA (typ) current source through SS. The voltage at
SS is compared to the internal 0.5V reference (V REF ).
ALWAYS-ON
INPUT 3V
TO 5.5V
BIAS
OUT
OUTPUT
The feedback voltage for regulation (V REG ) is the lower
of V SS or V REF . As V SS rises, the regulation voltage
(V REG ) rises at the same rate. Once V SS reaches and
rises above V REF , the regulation voltage then tracks the
reference voltage since it is the lower of V SS and V REF .
The value of C SS determines the length of the soft-start
time, t SS . Use the following formula to determine C SS .
C SS = 10 -5 x t SS
where C SS is in farads and t SS is in seconds.
INPUT
1.2V TO 3.6V
ENABLE
SHUTDOWN
1 μ F
IN
EN
MAX15028
SS
FB
I.C.
GND
R1
R2
4.7 μ F
0.1uF
Figure 1. MAX15028 Typical Application Circuit
8
_______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX15030ATB+T | IC REG LDO ADJ .5A 10-TDFN |
| MAX15031ATE+ | IC BOOST CONV/CURRENT MON 16TQFN |
| MAX15032ATA+T | IC REG BOOST ADJ 1A 8TDFN-EP |
| MAX15034AAUI+ | IC REG CTRLR BUCK PWM CM 28TSSOP |
| MAX15035ETL+T | IC REG BOOST SYNC 15A 40TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15028ATB/V+ | 制造商:Maxim Integrated Products 功能描述:1.425V TO 3.6V INPUT 1A LOW-DROPOU - Rail/Tube |
| MAX15028ATB/V+T | 功能描述:低压差稳压器 - LDO 1.425-3.6V 1A w/BIAS Input 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 |
| MAX15028ATB+T | 功能描述:低压差稳压器 - LDO 1.425-3.6V 1A w/BIAS Input 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 |
| MAX15029ATB/V+ | 制造商:Maxim Integrated Products 功能描述:1.425V TO 3.6V INPUT 0.5A LOW-DROP - Rail/Tube |
| MAX15029ATB/V+T | 功能描述:低压差稳压器 - LDO 1.425-3.6V .5A w/BIAS Input 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 |
发布紧急采购，3分钟左右您将得到回复。