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PDF MAX5092 Data sheet ( Hoja de datos )
| Número de pieza | MAX5092 | |
| Descripción | (MAX5092 / MAX5093) LDOs | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0659; Rev 0; 10/06
EVAALVUAAILTAIOBNLEKIT
4V to 72V Input LDOs with Boost Preregulator
General Description
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.
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_).
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.
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.
Applications
Automotive—Body Electronics
Automotive—ECU
Industrial
Features
♦ Wide Operating Input Voltage Range: 3.5V to 72V
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 (VIN ≥8V)
♦ 5µA Shutdown Current
♦ 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
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
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.
Pin Configuration
TOP VIEW
12 11 10 9
BSFB 13
VL 14
CT 15
MAX5092_/
MAX5093_
RESET 16
+
8 OUT
7 OUT_SENSE
6 SET
5 PGND_LDO
1234
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.
1 page  
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4V to 72V Input LDOs with Boost Preregulator
Typical Operating Characteristics
(VIN = VEN = 14V, CIN = 47µF, CBSOUT = 22µF, COUT = 10µF, CVL = 1µF, TA = +25°C, unless otherwise noted.) (See Figures 4–7 as
applicable.)
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5092B)
90
85
IOUT = 100µA
80
75
70
65 IOUT = 10mA
60
55
50
8
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = IIN - IOUT
16 24 32 40 48 56 64 72
INPUT VOLTAGE (V)
INPUT CURRENT (IIN)
vs. INPUT VOLTAGE (MAX5092B)
100
IOUT = 10mA
10
1 IOUT = 100µA
BOOST CONVERTER SWITCHING
0.1
4.0 4.5 5.0 5.5 6.0 6.5 7.0
INPUT VOLTAGE (V)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE (MAX5092B)
100
BOOST CONVERTER NOT SWITCHING,
90 QUIESCENT SUPPLY CURRENT = IIN - IOUT
80
IOUT = 10mA
70
60
IOUT = 100µA
50
40
-40 -15 10 35 60 85 110 135
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE (MAX5093B)
100
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = IIN - IOUT
90
80
70 IOUT = 10mA
60
IOUT = 100µA
50
40
-40 -15
10 35 60 85
TEMPERATURE (°C)
110 135
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5092B)
10
8
6
4
2
VEN = 0V
0
4 14 24 34 44 54 64 74
INPUT VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5093B)
10
8
6
4
2
VEN = 0V
0
4 14 24 34 44 54 64 74
INPUT VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE (MAX5092B)
10
8
VOUT
50mV/div
LINE-TRANSIENT RESPONSE
(VIN STEP FROM 4V TO 7V)
MAX5092/93 toc08
IOUT = 250mA
5V (AC-COUPLED)
7V
6
VIN
1V/div
4 4V
VEN = 0V
2
-40 -15 10 35 60 85 110 135
TEMPERATURE (°C)
VBSOUT
1V/div
200µs/div
7V (AC-COUPLED)
_______________________________________________________________________________________ 5
5 Page 
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4V to 72V Input LDOs with Boost Preregulator
Functional Diagrams (continued)
MAX5093_
1µs
ONE-SHOT
OUT IN
IN
INTERNAL
LDO
SQ
DRIVER
VL
VL
LX
LX
BSOUT
2.25µs
ONE-SHOT
OUT IN
RQ
HOLD
EN
CONTROL LOGIC,
THERMAL SHUTDOWN,
AND OVERCURRENT
PROTECTION
CURRENT-LIMITING
COMPARATOR
RS
VPK
MUX
VREF
LDO
VREF
ERROR AMPLIFIER
R1
BSFB
R2
OUT
OUT_SENSE
R3
0.92 x VREF
VL
CT
COMPARATOR
2µA
MUX
DELAY
COMPARATOR
R4
SET
CT
RESET
SGND
PGND_LDO
PGND_BST
Figure 2. MAX5093_ Functional Diagram
P
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet MAX5092.PDF ] | |
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