MAX5096_0709 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – 40V, 600mA Buck Converters with Low- Quiescent-Current Linear Regulator Mode

19-0603; Rev 2; 9/07
EVAALVUAAILTAIOBNLEKIT
40V, 600mA Buck Converters with Low-
Quiescent-Current Linear Regulator Mode
General Description
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-
escent-current (I_Q) LDO mode of operation at light load.
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.
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.
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).
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.
Applications
Automotive
Industrial
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Features
♦ High-Efficiency Switcher Mode (Buck Mode) or
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)
Output Voltage Versions
♦ 6μA (typ) Shutdown Current
♦ Fixed 135kHz or 330kHz Switching Frequency
♦ External Frequency Synchronization
♦ Programmable Soft-Start
♦ 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_A = +70°C (16-Pin TQFN)
1.7W at T_A = +70°C (20-Pin TSSOP)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE ^PKG
CODE
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
+Denotes lead-free package.
*EP = Exposed pad.
Pin Configurations
TOP VIEW
16 15 14 13
+
PGND 1
SGND 2
RESET 3
MAX5096
MAX5097
BP 4
5
6
7
8
TQFN
TOP VIEW
+
IN 1
12 EN
11 OUT
10 ADJ
9 LDO/BUCK
IN 2
IN 3
PGND 4
SGND 5
RESET 6
BP 7
N.C. 8
SYNC 9
SS 10
MAX5096
MAX5097
TSSOP
20 LX
19 LX
18 N.C.
17 EN
16 OUT
15 ADJ
14 N.C.
13 LDO/BUCK
12 COMP
11 CT
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.