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MAX5097B PDF预览

MAX5097B

更新时间: 2024-11-26 05:00:11
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描述
40V, 600mA Buck Converters with Low-Quiescent-Current Linear Regulator Mode

MAX5097B 数据手册

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19-0603; Rev 0; 7/06  
40V, 600mA Buck Converters with Low-  
Quiescent-Current Linear Regulator Mode  
General Description  
Features  
High-Efficiency Switcher Mode (Buck Mode) or  
The MAX5096/MAX5097 easy-to-use, Dual Mode™,  
DC-DC converters operate as LDO (low dropout) or  
switch-mode buck converters. At a high output load,  
the converters operate as high-efficiency pulse-width-  
modulated (PWM) switch-mode converters and reduce  
the power dissipation. The devices switch to a low-qui-  
Low-Quiescent-Current Linear Regulator  
(LDO Mode) Operation  
Wide Operating Input Voltage Range  
+5V to +40V Buck Mode  
+4V to +40V LDO Mode  
Fixed 3.3V or 5V and Adjustable (1.24V to 11V)  
escent-current (I ) LDO mode of operation at light load.  
Q
Output Voltage Versions  
During the key-off condition, the system’s microcon-  
troller drives the LDO/BUCK input on the fly and forces  
the MAX5096/MAX5097 into LDO Mode, thereby reduc-  
ing the quiescent current significantly.  
6µA (typ) Shutdown Current  
Fixed 135kHz or 330kHz Switching Frequency  
External Frequency Synchronization  
Programmable Soft-Start  
In Buck Mode, the MAX5096/MAX5097 operate from a 5V  
to 40V input voltage range and deliver up to 600mA of  
load current with excellent load and line regulation. The  
fixed-switching frequency versions of 135kHz and  
330kHz are available. The MAX5096/MAX5097 DC-DC  
internal oscillator can be synchronized to an external  
clock. External compensation and a current-mode control  
scheme make it easy to design with.  
Integrated Microprocessor Reset (RESET) Circuit  
with Programmable Timeout Period  
Thermal and Short-Circuit Protection  
-40°C to +125°C Automotive Temperature Range  
Thermally-Enhanced Package Dissipates  
2.6W at T = +70°C (16-Pin TQFN)  
A
1.7W at T = +70°C (20-Pin TSSOP)  
A
Ordering Information  
In LDO Mode, the MAX5096/MAX5097 operate from a  
4V to 40V input voltage. The LDO Mode operation is  
intended for a lower output load current of up to  
100mA. The quiescent current at 100µA load in LDO  
Mode is only 41µA (typ).  
PKG  
CODE  
PART  
TEMP RANGE PIN-PACKAGE  
MAX5096AATE+* -40°C to +125°C 16 TQFN-EP** T1655-2  
MAX5096BATE+ -40°C to +125°C 16 TQFN-EP** T1655-2  
MAX5096AAUP+* -40°C to +125°C 20 TSSOP-EP** U20E-4  
MAX5096BAUP+* -40°C to +125°C 20 TSSOP-EP** U20E-4  
MAX5097AATE+ -40°C to +125°C 16 TQFN-EP** T1655-2  
MAX5097BATE+* -40°C to +125°C 16 TQFN-EP** T1655-2  
MAX5097AAUP+* -40°C to +125°C 20 TSSOP-EP** U20E-4  
MAX5097BAUP+* -40°C to +125°C 20 TSSOP-EP** U20E-4  
The MAX5096/MAX5097 feature an enable input that  
shuts down the device, reducing the current consump-  
tion to 6µA (typ). Additional features include a power-on  
reset output with a capacitor-adjustable timeout period,  
programmable soft-start, output tracking, output over-  
load, short-circuit and thermal shutdown protections.  
The MAX5096/MAX5097 operate over the -40°C to  
+125°C automotive temperature range and are avail-  
able in thermally enhanced 20-pin TSSOP or 16-pin  
TQFN packages.  
*Future product—contact factory for availability.  
+Denotes lead-free package.  
**EP = Exposed pad.  
Applications  
Pin Configurations  
TOP VIEW  
TOP VIEW  
Automotive  
Industrial  
+
16  
15  
14  
13  
+
IN  
IN  
1
2
3
4
5
6
7
8
9
20 LX  
19 LX  
PGND  
SGND  
RESET  
BP  
EN  
1
2
3
4
12  
11  
10  
9
IN  
18 N.C.  
17 EN  
OUT  
PGND  
SGND  
RESET  
BP  
MAX5096  
MAX5097  
MAX5096  
MAX5097  
16 OUT  
15 ADJ  
14 N.C.  
ADJ  
LDO/BUCK  
LDO/BUCK  
N.C.  
SYNC  
13  
5
6
7
8
12 COMP  
11 CT  
SS 10  
Dual Mode is a trademark of Maxim Integrated Products, Inc.  
TQFN  
TSSOP  
________________________________________________________________ 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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