EVALUATION KIT AVAILABLE
MAX5092/MAX5093
General Description
4V to 72V Input LDOs with Boost Preregulator
Features
The MAX5092A/MAX5092B/MAX5093A/MAX5093B low-
quiescent-current, low-dropout (LDO) regulators contain
simple boost preregulators operating at a high fre-
quency. The devices seamlessly provide a preset 3.3V
(MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B)
LDO output voltage from a cold-crank through load-dump
(3.5V to 80V) input voltage conditions. The MAX5092_/
MAX5093_ deliver up to 250mA with excellent load and
line regulation. During normal operation, when the battery
is healthy, the boost preregulator 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 multiple-
winding custom magnetics needed in typical single-ended
primary inductor converter (SEPIC) and transformer-
based flyback topologies. The high operating frequency
of the boost regulator significantly reduces component
size. The MAX5092_ integrates a blocking diode to fur-
ther reduce the external component count. The boost
preregulator output voltage is preset to 7V. Both LDO and
boost output voltages are programmable using external
resistors. The boost preregulator output voltage is adjust-
able 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) shut-
down current, a
HOLD
input to implement a self-holding cir-
cuit, and a power-on-reset output (RESET) with an externally
programmable timeout period. Additional features 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 (PCB).
●
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 (V
IN
≥ 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
MAX5092AATE+
MAX5092BATE+
MAX5093AATE+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
16 TQFN-EP*
MAX5093BATE+
-40°C to +125°C
16 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
PGND_BST
TOP VIEW
12
11
10
BSOUT
9
LX
LX
BSFB 13
VL 14
CT 15
RESET
16
8
OUT
OUT_SENSE
SET
PGND_LDO
Applications
●
Industrial
MAX5092_/
MAX5093_
7
6
+
1
IN
2
EN
3
SGND
4
HOLD
5
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
THIN QFN
(5mm x 5mm)
19-0659; Rev 2; 10/14
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
Absolute Maximum Ratings
IN, EN, LX, BSOUT to SGND..................................-0.3V to +80V
PGND_BST, PGND_LDO to SGND.......................-0.3V to +0.3V
RESET,
OUT, OUT_SENSE to SGND....................-0.3V to +12V
BSOUT to LX (MAX5092_)......................................-0.3V to +12V
VL, SET, BSFB, SGND..............................................-0.3V to +6V
HOLD
to SGND.....................................-0.3V to (V
OUT
+ 0.3V)
CT to SGND................................................-0.3V to (V
VL
+ 0.3V)
OUT Current (I
OUT
) Short Circuit to PGND_LDO,
(V
IN
≤ 28V).............................................................Continuous
Note 1:
As per JEDEC Standard 51 (Multilayer Board).
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
RESET
Sinking Current.........................................................5mA
Continuous Power Dissipation (T
A
= +70°C)
Thin QFN (derate 33.3mW/°C
above +70°C)...............................................2666mW (Note 1)
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Electrical Characteristics
(V
IN
= V
EN
= 14V, I
OUT
= 1mA, C
IN
= 47μF, C
BSOUT
= 22μF, C
OUT
= 10μF, C
VL
= 1μF, T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. See Figures 4–7 as applicable. Typical specifications are at T
A
= +25°C.) (Note 2)
PARAMETER
INPUT SUPPLY
Input Voltage Range
Internal Input Undervoltage
Lockout
Supply Current (Boost Converter
Off)
Supply Current (Boost Converter
On)
Shutdown Supply Current
BOOST CONVERTER
Minimum BSOUT Output Current
Boost Converter Enable
Threshold
Boost Converter Disable
Threshold
Boost Converter Disable
Hysteresis
BSOUT Output Voltage
I
BSOUT
V
BST_EN
V
BST_DIS
V
BST_HYS
V
BSOUT
V
IN
= 4V, BSFB = SGND, V
OUT
= 5V
MAX5092_
MAX5093_
1.18
V
IN
= 4V
V
BSOUT
– V
OUT
falling (Note 5)
V
BSOUT
– V
OUT
rising (Note 5)
1.7
2.2
250
2.0
2.5
0.5
7.00
11
12
1.24
1.30
100
0.5
0.80
1
1.2
1.25
2.3
2.8
mA
V
V
V
V
V
V
nA
Ω
µs
V
IN
V
UVLOF
V
UVLOR
I
Q
I
S
I
SHDN
(Note 3)
V
IN
falling
V
IN
rising
LDO mode,
I
OUT
= 100µA
V
IN
= 5V
V
EN
≤
+0.4V
T
J
= -40°C to +125°C
(Note 4)
T
J
= -40°C to +125°C
(Note 4)
4
3.0
3.4
3.2
3.6
65
70
0.4
6
72
3.4
3.8
85
100
1.0
10
mA
µA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
µA
LDO mode, I
OUT
= 250mA
Maximum BSOUT Output Voltage V
BSOUT(MAX)
BSFB Regulation Voltage
BSFB Input Bias Current
Boost Internal Switch
On-Resistance
Boost Internal Switch Minimum
Off-Time
V
BSFB
I
BSFB
R
DS(ON)
t
OFF
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Maxim Integrated
│
2
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
Electrical Characteristics (continued)
(V
IN
= V
EN
= 14V, I
OUT
= 1mA, C
IN
= 47μF, C
BSOUT
= 22μF, C
OUT
= 10μF, C
VL
= 1μF, T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. See Figures 4–7 as applicable. Typical specifications are at T
A
= +25°C.) (Note 2)
PARAMETER
Boost Internal Switch Maximum
On-Time
Internal Switch Current Limit
Boost Turn-On Response Time
Internal Diode Forward Voltage
Drop
LDO
Guaranteed Output Current
I
OUT
V
BSOUT
- V
OUT
= 2V (Note 6)
SET = SGND,
MAX5092A/
MAX5093A
SET = SGND,
MAX5092B/
MAX5093B
I
OUT
= 1mA
100µA
≤
I
OUT
≤
250mA
I
OUT
= 1mA
100µA
≤
I
OUT
≤
250mA
250
3.25
3.2
4.900
4.85
3.3
3.3
5
5
1.5
9
V
10
1.5
0.9
200
0.4
0.5
1.6
1.205
1.235
0.5
I
OUT
= 1mA to 250mA
f = 100Hz
Power-Supply Rejection Ratio
PSRR
f = 1MHz
Short-Circuit Current
I
SC
I
OUT
= 10mA,
V
BSOUT(AC)
= 500mV
P-P
,
V
OUT
= 5V
I
OUT
= 10mA,
V
BSOUT(AC)
= 500mV
P-P
,
V
OUT
= 5V
255
0.2
80
dB
60
490
mA
1.265
100
0.6
V
nA
mV/mA
mV/V
10.0
1.6
V
V
µs
3.35
3.4
5.075
5.10
V
V
mA
V
F
SYMBOL
t
ON-max
I
LIM
Measured in steady-state condition
Time from V
BSOU
T falling below regulation
to switch on-time
MAX5092_ only, I
F
= 1A
CONDITIONS
MIN
1.80
1.5
2
0.95
TYP
2.25
MAX
2.70
3.0
5
UNITS
µs
A
µs
V
Output Voltage
V
OUT
Minimum Adjustable Output
Voltage
Maximum Adjustable Output
Voltage
V
ADJMIN
Boost operation, V
IN
= 4V, V
BSOUT
= 7V
Boost
operation, V
IN
= 4V
MAX5092_,
V
BSOUT
= 11V
MAX5093_,
V
BSOUT
= 12V
V
ADJMAX
Adjustable Output Voltage
Dropout Voltage
LDO Startup Response Time
V
ADJ
∆V
DO
LDO operation, V
IN
≥ V
BST_DIS
(boost converter off) (Note 7)
I
OUT
= 250mA (Note 8)
Rising edge of V
BSOUT
to the rising edge
of V
OUT
, R
L
= 500Ω, SET = SGND
7V
≤
V
IN
≤
MAX5092A/MAX5093A
72V,
I
LOAD
= 10mA MAX5092B/MAX5093B
7V
≤
V
IN
≤
28V, I
LOAD
= 250mA
Line Regulation
SET Reference Voltage
SET Input Bias Current
Load Regulation
∆V
OUT
/
∆V
IN
V
SET
I
SET
∆V
OUT
/
∆I
OUT
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Maxim Integrated
│
3
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
Electrical Characteristics (continued)
(V
IN
= V
EN
= 14V, I
OUT
= 1mA, C
IN
= 47μF, C
BSOUT
= 22μF, C
OUT
= 10μF, C
VL
= 1μF, T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. See Figures 4–7 as applicable. Typical specifications are at T
A
= +25°C.) (Note 2)
PARAMETER
ENABLE,
HOLD
and
RESET
EN High Input Threshold
EN Low Input Threshold
EN Input Bias Current
HOLD
Low Input Threshold
HOLD
Release Voltage
HOLD
Pullup Current
RESET
Voltage Threshold
RESET
Threshold Hysteresis
RESET
Output Low Voltage
RESET
Output High Leakage
Current
RESET
Output Minimum Timeout
Period
EN to
RESET
Minimum Timeout
Delay
Delay Comparator Threshold
(Rising)
Delay Comparator Threshold
Hysteresis
CT Charge Current
CT Discharge Current
Thermal Shutdown Temperature
Threshold
Thermal Shutdown Temperature
Hysteresis
Note
Note
Note
Note
2:
3:
4:
5:
V
CTTH
V
CTTH-HYS
I
CT-CHG
I
CT-DIS
T
J(SHDN)
T
J(HYST)
Temperature rising
1.5
SYMBOL
EN
H
EN
L
I
EN
V
IL
V
IH
I
HOLD
V
RESET
V
RHYST
V
RL
I
RH
Regulator on, EN transition from high to
low
EN = low
Internally connected to OUT
% of V
OUT
, V
OUT
falling
% of V
OUT
I
SINK
= 1mA
V
RESET
= 5V
C
CT
not connected
C
CT
not connected
1.205
25
260
1.24
100
2
5
+165
20
2.5
1.265
87
V
OUT
-
0.4
4
90
2
0.4
1
92
0.25
CONDITIONS
MIN
2.4
0.4
2
0.4
TYP
MAX
UNITS
V
V
µA
V
V
µA
%
%
V
µA
µs
µs
V
mV
µA
mA
°C
°C
Limits at -40°C are guaranteed by design and characterization; not production tested.
Guaranteed minimum operating voltage is 3.5V on V
IN
falling only.
Guaranteed by design and not production tested.
The boost converter disable threshold (V
BST_DIS
) is a static measurement. Internal comparator delay may cause a higher
disable level.
Note 6:
The continuous maximum output current from the LDO is guaranteed according to the maximum power dissipation imposed
by the package thermal constraints.
Note 7:
Maximum output adjustable value is conditioned by the maximum adjustable BSOUT Output Voltage Range minus the
maximum dropout across the pass transistor.
Note 8:
Dropout voltage is defined as (V
BSOUT
- V
OUT
) when V
OUT
is 2% below the value of V
OUT
for V
BSOUT
= V
OUT
+ 2V.
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Maxim Integrated
│
4
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
(V
IN
= V
EN
= 14V, C
IN
= 47μF, C
BSOUT
= 22μF, C
OUT
= 10μF, C
VL
= 1μF, T
A
= +25°C, unless otherwise noted.) (See Figures 4–7 as
applicable.)
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5092B)
MAX5092/93 toc01
Typical Operating Characteristics
MAX5092/93 toc02
QUIESCENT SUPPLY CURRENT (µA)
INPUT CURRENT (mA)
80
75
70
65
60
55
50
8
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 10mA
10
QUIESCENT SUPPLY CURRENT (µA)
85
90
80
70
60
50
40
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = I
IN
- I
OUT
I
OUT
= 10mA
1
I
OUT
= 100µA
I
OUT
= 100µA
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = I
IN
- I
OUT
16
24
32
40
48
56
64
72
INPUT VOLTAGE (V)
BOOST CONVERTER SWITCHING
0.1
4.0
4.5
5.0
5.5
6.0
6.5
7.0
-40
-15
10
35
60
85
110
135
INPUT VOLTAGE (V)
TEMPERATURE (°C)
MAX5092/93 toc05
SHUTDOWN SUPPLY CURRENT (µA)
90
80
70
60
50
40
8
6
4
2
0
V
EN
= 0V
4
14
24
34
44
54
64
SHUTDOWN SUPPLY CURRENT (µA)
QUIESCENT SUPPLY CURRENT (µA)
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = I
IN
- I
OUT
MAX5092/93 toc04
8
6
4
2
0
V
EN
= 0V
4
14
24
34
44
54
64
I
OUT
= 10mA
I
OUT
= 100µA
-40
-15
10
35
60
85
110
135
74
74
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
MAX5092/93 toc07
10
SHUTDOWN SUPPLY CURRENT (µA)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE (MAX5092B)
SWITCHING WAVEFORMS
V
BSOUT
PROGRAMMED < (V
OUT
+ V
BST_DIS
)
MAX5092/93 toc08
8
V
IN
1V/div
V
BSOUT
2V/div
V
OUT
100mV/div
5V
(AC-COUPLED)
8.5V
(AC-COUPLED)
6
4
V
EN
= 0V
-40
-15
10
35
60
85
110
135
TEMPERATURE (°C)
V
IN
= 5V, I
OUT
= 100mA,
V
BSOUT
PROGRAMMED TO 11V
5V
(AC-COUPLED)
2
I
LX
2A/div
100µs/div
0
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Maxim Integrated
│
5
MAX5092/93 toc06
100
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE (MAX5093B)
10
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5092B)
10
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5093B)
MAX5092/93 toc03
90
100
INPUT CURRENT (I
IN
)
vs. INPUT VOLTAGE (MAX5092B)
100
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE (MAX5092B)
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