Rainbow Electronics MAX5097 - Manual

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
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)
MAX5096/MAX5097
40V, 600mA Buck Converters with Low-
Quiescent-Current Linear Regulator Mode
________________________________________________________________ Maxim Integrated Products 1
19-0603; Rev 0; 7/06
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.
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
TQFN
+
LX
16
1
2
3
4
12
11
10
9
15 14 13
5 6 7 8
IN IN LX
EN
OUT
ADJ
LDO/BUCK
SGND
RESET
BP
SYNC
SS CT
COMP
PGND
MAX5096
MAX5097
TOP VIEW
20
19
18
17
16
15
14
1
2
3
4
5
6
7
LX
LX
N.C.
EN PGND
IN
IN
IN
TOP VIEW
MAX5096
MAX5097
OUT
ADJ
N.C. BP
13 8 N.C.
12 9 COMP SYNC
11 10 CT SS
SGND
TSSOP
LDO/BUCK
RESET
+
Pin Configurations
*Future product—contact factory for availability.
+Denotes lead-free package.
**EP = Exposed pad.
Dual Mode is a trademark of Maxim Integrated Products, Inc.