Rainbow Electronics MAX5093 User Manual
General Description
The MAX5092A/MAX5092B/MAX5093A/MAX5093B lowquiescent-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 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 further 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 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-holding circuit, 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.
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
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration
Ordering Information
19-0659; Rev 0; 10/06
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.
+
Denotes lead-free package.
*
Future product—contact factory for availability.
**
EP = Exposed pad.
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
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
PINPACKAGE
PKG
CODE
TOP VIEW
BSFB
13
LX
PGND_BST
12 11 9
10
BSOUT
OUT
8
RESET
14
VL
CT
15
16
MAX5092_/
MAX5093_
1+2
IN
(5mm x 5mm)
3
EN
SGND LX
THIN QFN
7
6
5
4
HOLD
OUT_SENSE
SET
PGND_LDO
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= VEN= 14V, I
OUT
= 1mA, CIN= 47µF, C
BSOUT
= 22µF, C
OUT
= 10µF, CVL= 1µF, TA= TJ= -40°C to +125°C, unless otherwise
noted. See Figures 4–7 as applicable. Typical specifications are at T
A
= +25°C.) (Note 2)
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.
Note 1: As per JEDEC Standard 51 (Multilayer Board).
IN, EN, LX, BSOUT to SGND..................................-0.3V to +80V
PGND_BST, PGND_LDO to SGND .......................-0.3V to +0.3V
VL, RESET, OUT, OUT_SENSE to SGND ...............-0.3V to +12V
BSOUT to LX (MAX5092_)......................................-0.3V to +12V
SET, BSFB, CT to SGND ..........................................-0.3V to +6V
HOLD to SGND….....................................-0.3V to (V
OUT
+ 0.3V)
OUT Current (I
OUT
) Short Circuit to PGND_LDO,
(V
IN
≤ 28V) ..............................................................Continuous
RESET Sinking Current .........................................................5mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin 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
)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLY
Input Voltage Range V
Internal Input Undervoltage
Lockout
Supply Current (Boost Converter
Off)
Supply Current (Boost Converter
On)
Shutdown Supply Current I
BOOST CONVERTER
Minimum BSOUT Output Current I
Boost Converter Disable
Threshold
Boost Converter Disable
Threshold Hysteresis
BSOUT Output Voltage V
Maximum BSOUT Output Voltage V
BSFB Regulation Voltage V
BSFB Input Bias Current I
Boost Internal Switch
On-Resistance
Boost Internal Switch Minimum
Off-Time
IN
V
UVLOF
V
UVLOR
I
Q
I
S
SHDN
BSOUT
V
BST_DIS
BSOUT
BSOUT(MAX
BSFB
BSFB
R
DS(ON)
t
OFF
(Note 3) 4 72 V
VIN falling 3.0 3.2 3.4
VIN rising 3.4 3.6 3.8
LDO mode,
= 100µA
I
OUT
LDO mode, I
VIN = 5V 0.4 1.0 mA
VEN ≤ +0.4V
VIN = 4V 250 mA
VIN rising 7.5 8.0 8.5 V
VIN = 4V, BSFB = SGND 6.65 7.00 7.35 V
MAX5092_ 11
MAX5093_ 12
T
= -40°C to +125°C
J
(Note 4)
= 250mA 70 100
OUT
= -40°C to +125°C
T
J
(Note 4)
65 85
610µA
0.5 V
1.18 1.24 1.30 V
100 nA
0.5 1.2 Ω
0.80 1 1.25 µs
V
µA
V
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VEN= 14V, I
OUT
= 1mA, CIN= 47µF, C
BSOUT
= 22µF, C
OUT
= 10µF, CVL= 1µF, TA= TJ= -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 SYMBOL CONDITIONS MIN TYP MAX UNITS
Boost Internal Switch Maximum
On-Time
Internal Switch Current Limit I
Boost Turn-On Response Time
Internal Diode Forward Voltage
Drop
LDO
Guaranteed Output Current I
Output Voltage V
Minimum Adjustable Output
Voltage
Maximum Adjustable Output
Voltage
Adjustable Output Voltage V
Dropout Voltage ∆V
LDO Startup Response Time
Line Regulation
SET Reference Voltage V
SET Input Bias Current I
Load Regulation
Power-Supply Rejection Ratio PSRR
Short-Circuit Current I
t
ON-MAX
LIM
V
F
OUT
OUT
V
ADJMIN
V
ADJMAX
ADJ
DOIOUT
∆V
OUT
∆V
IN
SET
SET
∆V
OUT
∆I
OUT
SC
Measured in steady-state condition 1.5 3.0 A
Time from V
BSOUT
to switch on-time
MAX5092_ only, IF = 1A 0.95 V
V
- V
BSOUT
= 2V (Note 5) 250 mA
OUT
SET = SGND,
MAX5092A/
MAX5093A
SET = SGND,
MAX5092B/
MAX5093B
Boost operation, VIN = 4V, V
Boost operation,
V
= 4V
IN
LDO operation, VIN ≥ V
(boost converter off) (Note 6)
= 250mA (Note 7) 0.9 1.6 V
Rising edge of V
V
OUT
7V ≤ VIN ≤ 72V,
/
I
LOAD
7V ≤ VIN ≤ 28V, I
/
I
= 1mA to 250mA 0.2 0.6 mV/mA
OUT
, RL = 500Ω, SET = SGND
= 10mA
BSOUT
LOAD
f = 100Hz
f = 1MHz
1.80 2.25 2.70 µs
falling below regulation
I
= 1mA 3.25 3.3 3.35
OUT
100µA ≤ I
I
= 1mA 4.900 5 5.075
OUT
100µA ≤ I
≤ 250mA 3.2 3.3 3.4
OUT
≤ 250mA 4.85 5 5.10
OUT
= 7V 1.5 V
BSOUT
MAX5092_,
V
BSOUT
= 11V
MAX5093_,
V
BSOUT
BST_DIS
= 12V
1.5 10.0 V
to the rising edge of
25µs
V
9
V
10
200 µs
MAX5092A/MAX5093A 0.4
MAX5092B/MAX5093B 0.5
mV/V
= 250mA 1.6
1.205 1.235 1.265 V
0.5 100 nA
I
= 10mA, V
OUT
= 500mV
I
= 10mA, V
OUT
= 500mV
P-P
P-P
BSOUT(AC)
, V
OUT
BSOUT(AC)
, V
OUT
= 5V
= 5V
80
dB
60
255 490 mA
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VEN= 14V, I
OUT
= 1mA, CIN= 47µF, C
BSOUT
= 22µF, C
OUT
= 10µF, CVL= 1µF, TA= TJ= -40°C to +125°C, unless otherwise
noted. See Figures 4–7 as applicable. Typical specifications are at T
A
= +25°C.) (Note 2)
Note 2: Limits at -40°C are guaranteed by design and characterization; not production tested.
Note 3: Guaranteed minimum operating voltage is 3.5V on V
IN
falling only.
Note 4: Guaranteed by design and not production tested.
Note 5: The continuous maximum output current from the LDO is guaranteed according to the maximum power dissipation imposed
by the package thermal constraints.
Note 6: Maximum output adjustable value is conditioned by the maximum adjustable BSOUT Output Voltage Range minus the maxi-
mum dropout across the pass transistor.
Note 7: 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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ENABLE, HOLD and RESET
EN High Input Threshold EN
EN Low Input Threshold EN
EN Input Bias Current I
HOLD Low Input Threshold V
HOLD Release Voltage V
HOLD Pullup Current I
RESET Voltage Threshold V
RESET Threshold Hysteresis V
RESET Output Low Voltage V
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 I
CT Discharge Current I
EN
IL
IH
HOLD
RESET
RHYST
RL
I
RH
V
CTTH
V
CTTH-HYS
CT-CHG
CT-DIS
H
L
2.4 V
0.25 2 µA
Regulator on, EN transition from high to low 0.4 V
V
-
EN = low
OUT
0.4
Internally connected to OUT 4 µA
% of V
% of V
I
SINK
V
R E SE T
C
CT
C
CT
, V
OUT
OUT
falling 87 90 92 %
OUT
2%
= 1mA 0.4 V
= 5V 1 µA
not connected 25 µs
not connected 260 µs
1.205 1.24 1.265 V
100 mV
1.5 2 2.5 µA
5mA
0.4 V
V
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
_______________________________________________________________________________________
5
Typical Operating Characteristics
(VIN= VEN= 14V, CIN= 47µF, C
BSOUT
= 22µF, C
OUT
= 10µF, CVL= 1µF, TA= +25°C, unless otherwise noted.) (See Figures 4–7 as
applicable.)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE (MAX5092B)
MAX5092/93 toc07
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (µA)
11085603510-15
4
6
8
10
2
-40 135
V
EN
= 0V
LINE-TRANSIENT RESPONSE
(V
IN
STEP FROM 4V TO 7V)
MAX5092/93 toc08
200µs/div
V
OUT
50mV/div
V
IN
1V/div
V
BSOUT
1V/div
5V (AC-COUPLED)
7V
4V
7V (AC-COUPLED)
I
OUT
= 250mA
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5092B)
90
85
80
75
70
65
60
QUIESCENT SUPPLY CURRENT (µA)
55
50
872
I
OUT
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = I
INPUT VOLTAGE (V)
= 10mA
I
OUT
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE (MAX5093B)
100
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = I
90
80
70
60
QUIESCENT SUPPLY CURRENT (µA)
50
40
-40 135
I
= 10mA
OUT
TEMPERATURE (°C)
I
= 100µA
IN
= 100µA
OUT
IN
- I
OUT
11085603510-15
- I
OUT
645616 24 32 40 48
100
MAX5092/93 toc01
INPUT CURRENT (mA)
0.1
MAX5092/93 toc04
SHUTDOWN SUPPLY CURRENT (µA)
INPUT CURRENT (IIN)
vs. INPUT VOLTAGE (MAX5092B)
I
= 10mA
OUT
10
I
= 100µA
1
BOOST CONVERTER SWITCHING
4.0 7.0
OUT
INPUT VOLTAGE (V)
MAX5092/93 toc02
QUIESCENT SUPPLY CURRENT (µA)
6.56.05.55.04.5
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5092B)
10
8
6
4
2
0
474
INPUT VOLTAGE (V)
V
MAX5092/93 toc05
SHUTDOWN SUPPLY CURRENT (µA)
= 0V
EN
645444342414
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE (MAX5092B)
100
BOOST CONVERTER NOT SWITCHING,
QUIESCENT SUPPLY CURRENT = I
90
80
70
60
50
40
-40 135
TEMPERATURE (°C)
I
OUT
= 10mA
I
OUT
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5093B)
10
8
6
4
2
0
474
INPUT VOLTAGE (V)
- I
IN
= 100µA
V
OUT
11085603510-15
EN
MAX5092/93 toc03
MAX5092/93 toc06
= 0V
645444342414
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VIN= VEN= 14V, CIN= 47µF, C
BSOUT
= 22µF, C
OUT
= 10µF, CVL= 1µF, TA= +25°C, unless otherwise noted.) (See Figures 4–7 as
applicable.)
LINE-TRANSIENT RESPONSE
(V
IN
STEP FROM 3.5V TO 72V)
MAX5092/93 toc09
40ms/div
V
IN
50V/div
V
OUT
50mV/div
V
BSOUT
50V/div
72V
3.5V
5V (AC-COUPLED)
72V
7V
I
OUT
= 5mA
LINE-TRANSIENT RESPONSE
(V
IN
STEP FROM 3.5V TO 14V)
MAX5092/93 toc10
200µs/div
V
OUT
100mV/div
V
BSOUT
5V/div
V
IN
5V/div
14V
14V
7V
5V (AC-COUPLED)
3.5V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX5092/93 toc14
FREQUENCY (Hz)
100k10k1k
-70
0
100 1M
VIN = 8V, I
OUT
= 10mA
PSRR (dB)
10dB/div
STARTUP THROUGH INPUT VOLTAGE
MAX5092/93 toc15
100µs/div
0V
V
IN
10V/div
V
BSOUT
10V/div
I
LX
5A/div
V
OUT
5V/div
0V
0A
0V
I
OUT
= 250mA
DROPOUT VOLTAGE (V
BSOUT
- V
OUT
)
vs. LDO LOAD CURRENT
MAX5092/93 toc11
LDO LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
20015010050
200
400
600
800
1000
0
0 250
LDO OUTPUT VOLTAGE
vs. LDO LOAD CURRENT (MAX5092B)
MAX5092/93 toc12
LDO LOAD CURRENT (mA)
LDO OUTPUT VOLTAGE (V)
200100
4.90
4.95
5.00
5.05
5.10
5.15
4.85
0 300
TA = -40°C: CIN = 10µF, C
BSOUT
= 4.7µF, C
OUT
= 10µF
(CERAMIC)
TA = +25°C, +135°C: CIN = 47µF, C
BSOUT
= 22µF
(ELECTROLYTIC), C
OUT
= 10µF (CERAMIC)
TA = +25°C, VIN = 4V
T
A
= +25°C, VIN = 14V
TA = -40°C, VIN = 4V
T
A
= -40°C, VIN = 14V
TA = +135°C, VIN = 4V
T
A
= +135°C, VIN = 14V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX5092/93 toc13
FREQUENCY (Hz)
100k10k1k
-70
0
10dB/div
100 1M
VIN = 14V, I
OUT
= 10mA
PSRR (dB)
MAX5092/MAX5093
4V to 72V Input LDOs with Boost Preregulator
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VIN= VEN= 14V, CIN= 47µF, C
BSOUT
= 22µF, C
OUT
= 10µF, CVL= 1µF, TA= +25°C, unless otherwise noted.) (See Figures 4–7 as
applicable.)
_______________________________________________________________________________________
7
SHUTDOWN THROUGH V
V
IN
10V/div
V
BSOUT
10V/div
I
LX
1A/div
V
OUT
5V/div
2ms/div
SHUTDOWN THROUGH ENABLE
V
IN
10V/div
V
BSOUT
10V/div
V
OUT
5V/div
V
EN
2V/div
200µs/div
IN
MAX5092/93 toc16
I
= 250mA
OUT
MAX5092/93 toc18
I
= 250mA
OUT
0V
0V
0A
0V
14V
14V
0V
0V
V
10V/div
V
BSOUT
10V/div
V
OUT
5V/div
V
2V/div
V
2V/div
V
RESET
2V/div
2V/div
OUT
V
STARTUP THROUGH ENABLE
IN
EN
200µs/div
RESET TIMING RESPONSE
EN
200µs/div
I
OUT
I
OUT
C
T
MAX5092/93 toc17
= 250mA
MAX5092/93 toc19
= 250mA
= 680pF
14V
14V
0V
0V
0V
0V
0V
V
vs. TEMPERATURE
3.36
3.34
3.32
(V)
3.30
OUT
V
3.28
3.26
3.24
-40 135
OUT
I
= 10mA, R5 = 100kΩ,
OUT
R4 = 165kΩ, FIGURE 6
TEMPERATURE (°C)
V
vs. TEMPERATURE
OUT
(MAX5092B)
5.10
MAX5092/93 toc20
11085603510-15
5.05
(V)
5.00
OUT
V
4.95
I
= 1mA, V
4.90
-40 135
OUT
TEMPERATURE (°C)
MAX5092/93 toc21
= 0V
SET
11085603510-15
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