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MAX5092

更新时间: 2024-11-02 03:53:59
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描述
4V to 72V Input LDOs with Boost Preregulator

MAX5092 数据手册

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19-0659; Rev 0; 10/06  
4V to 72V Input LDOs with Boost Preregulator  
2/MAX5093  
General Description  
Features  
Wide Operating Input Voltage Range: 3.5V to 72V  
The MAX5092A/MAX5092B/MAX5093A/MAX5093B low-  
quiescent-current, low-dropout (LDO) regulators contain  
simple boost preregulators operating at a high frequency.  
The devices seamlessly provide a preset 3.3V  
(MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B)  
LDO output voltage from an automotive cold-crank  
through load-dump (3.5V to 80V) input voltage condi-  
tions. The MAX5092_/MAX5093_ deliver up to 250mA  
with excellent load and line regulation. During normal  
operation, when the battery is healthy, the boost preregu-  
lator is completely turned off, reducing quiescent current  
to 65µA (typ). This makes the devices suitable for  
always-on power supplies.  
with a 4V Startup Voltage  
LDO Output Regulates to 5V Seamlessly from an  
Input Voltage of 3.5V to 72V  
Up to 250mA Output Current  
Preset 3.3V, 5V, or Externally Programmable LDO  
Output Voltage from 1.5V to 9V (MAX5092_) or  
from 1.5V to 10V (MAX5093_)  
Preset 7V or Externally Programmable Boost  
Output Voltage Up to 11V (MAX5092_) or Up to  
12V (MAX5093_)  
65µA Quiescent Current in LDO Mode (V 8V)  
IN  
5µA Shutdown Current  
The buck-boost operation achieved by this combination  
of LDO and boost preregulator offers the advantage of  
using a single off-the-shelf inductor in place of the mul-  
tiple-winding custom magnetics needed in typical sin-  
gle-ended primary inductor converter (SEPIC) and  
transformer-based flyback topologies. The high operat-  
ing frequency of the boost regulator significantly  
reduces component size. The MAX5092_ integrates a  
blocking diode to further reduce the external compo-  
nent count. The boost preregulator output voltage is  
preset to 7V. Both LDO and boost output voltages are  
programmable using external resistors. The boost pre-  
regulator output voltage is adjustable up to 11V  
(MAX5092_), or up to 12V (MAX5093_). The LDO output  
voltage is adjustable from 1.5V to 9V (MAX5092_) or  
from 1.5V to 10V (MAX5093_).  
Power-On Reset (RESET) with Programmable  
Timeout Period  
Output Short-Circuit and Thermal Protection  
TQFN Package Capable of Dissipating Up to 2.7W  
at +70°C  
Ordering Information  
PIN-  
PACKAGE  
PKG  
CODE  
PART  
TEMP RANGE  
MAX5092AATE+* -40°C to +125°C 16 TQFN-EP** T1655-3  
MAX5092BATE+ -40°C to +125°C 16 TQFN-EP** T1655-3  
MAX5093AATE+* -40°C to +125°C 16 TQFN-EP** T1655-3  
MAX5093BATE+ -40°C to +125°C 16 TQFN-EP** T1655-3  
+Denotes lead-free package.  
*Future product—contact factory for availability.  
**EP = Exposed pad.  
The devices feature a shutdown mode with 5µA (typ)  
shutdown current, a HOLD input to implement a self-hold-  
ing circuit, and a power-on-reset output (RESET) with an  
externally programmable timeout period. Additional fea-  
tures include output overload, short-circuit, and thermal  
protection.  
Pin Configuration  
TOP VIEW  
The MAX5092_/MAX5093_ are available in a thermally  
enhanced, 16-pin 5mm x 5mm thin QFN package and can  
dissipate up to 2.7W at +70°C on a multilayer PC board.  
12  
11  
10  
9
OUT  
8
7
6
5
BSFB 13  
VL 14  
Applications  
OUT_SENSE  
SET  
Automotive—Body Electronics  
Automotive—ECU  
Industrial  
MAX5092_/  
MAX5093_  
CT 15  
16  
PGND_LDO  
RESET  
+
1
2
3
4
Typical Operating Circuit and Selector Guide appear at end  
of data sheet.  
THIN QFN  
(5mm x 5mm)  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  

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