EVALUATION KIT AVAILABLE
MAX5096/MAX5097
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-
quiescent-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 quies-
cent 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 overload,
short-circuit, and thermal-shutdown protections.
The MAX5096/MAX5097 operate over the -40°C to
+125°C automotive temperature range and are available
in thermally enhanced 20-pin TSSOP or 16-pin TQFN
packages.
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) and 1.7W at T
A
= +70°C
(20-Pin TSSOP)
Ordering Information
PART
MAX5096AATE+
MAX5096BATE+
MAX5096AAUP+
MAX5096BAUP+
MAX5097AATE+
MAX5097BATE+
MAX5097AAUP+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
20 TSSOP-EP*
20 TSSOP-EP*
16 TQFN-EP*
16 TQFN-EP*
20 TSSOP-EP*
Applications
●
Industrial
MAX5097BAUP+
-40°C to +125°C 20 TSSOP-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configurations
LX
IN
IN
LX
TOP VIEW
+
PGND
SGND
RESET
BP
1
2
3
4
16
15
14
13
12 EN
11 OUT
TOP VIEW
IN 1
IN 2
IN 3
PGND 4
SGND 5
RESET
6
9
LDO/BUCK
BP 7
N.C. 8
SYNC 9
SS 10
+
20 LX
19 LX
18 N.C.
MAX5096
MAX5097
10 ADJ
MAX5096
MAX5097
17 EN
16 OUT
15 ADJ
14 N.C.
13 LDO/BUCK
12 COMP
11 CT
5
6
SS
7
CT
8
COMP
Dual Mode is a trademark of Maxim Integrated Products, Inc.
SYNC
TQFN
TSSOP
19-0603; Rev 4; 1/15
MAX5096/MAX5097
40V, 600mA Buck Converters with Low-
Quiescent-Current Linear Regulator Mode
Absolute Maximum Ratings
(All voltages referenced to PGND, unless otherwise noted.)
IN (transient, 1ms) .................................................-0.3V to +45V
SGND ...................................................................-0.3V to +0.3V
LX ..................................................................-1V to (V
IN
+ 0.3V)
LX Current ...............................................................................2A
EN...............................................................-0.3V to (V
IN
+ 0.3V)
BP, SYNC, LDO/BUCK,
RESET
to SGND ............-0.3V to +12V
BP,
RESET
Output Current ................................................25mA
CT, SS, ADJ, COMP to SGND ..................-0.3V to (V
BP
+ 0.3V)
OUT ....................................................................... -0.3V to +11V
OUT Short-Circuit Duration .......................................Continuous
Continuous Power Dissipation (T
A
= +70°C)*
16-Pin TQFN (derate 33.3mW/°C above +70°C) .....2666mW
20-Pin TSSOP (derate 21.7mW/°C above +70°C) ...1739mW
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -60°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
*As per JEDEC 51 Standard—Multilayer Board.
Package Thermal Characteristics
(Note 1)
TQFN
Junction-to-Ambient Thermal Resistance (θ
JA
) .........30.0°C/W
TSSOP
Junction-to-Ambient Thermal Resistance (θ
JA
) .........46.0°C/W
Junction-to-Case Thermal Resistance (θ
JC
) ..................1.7°C/W
Junction-to-Case Thermal Resistance (θ
JC
) .....................2°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to
www.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(V
IN
= +14V, I
OUT
= 1mA, C
IN
= 100μF, C
OUT
= 22μF, L = 22μH, C
BP
= 1μF, V
EN
= +2.4V, SGND = PGND = 0V, T
A
= T
J
=
-40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER
SYSTEM INPUT
Input Voltage Range (LDO Mode)
Input Voltage Range
(Buck Mode)
Internal Input Undervoltage
Lockout
Internal Input Undervoltage-
Lockout Hysteresis
BP (Internal Regulator) Output
Voltage
V
IN_LDO
V
IN_BUCK
V
UVLO
V
UVLO_HYS
V
BP
LDO/BUCK = high
LDO/BUCK = low
V
BP
rising
V
BP
rising
V
IN
= +4.5V, I
BP
= 100μA
LDO/BUCK = high,
measured at input supply
return, V
OUT
= 5V,
I
OUT
= 100μA
LDO/BUCK = high,
measured at input supply
return, V
OUT
= 5V,
I
OUT
= 100mA
T
A
= -40°C
to +125°C
3.75
4
5
3.5
3.65
0.2
4
4.20
40
40
3.9
V
V
V
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
Q
Quiescent Supply Current
(LDO Mode)
I
Q
Buck Converter No-Load Supply
Current
38
70
µA
T
A
= -40°C
to +125°C
44
100
I
Q_BUCK
V
IN
= 14V, V
OUT
= 5V, I
OUT
= 0
V
EN
= 0V, measured from
V
IN
T
A
= -40°C to
+125°C
T
A
= -40°C to
+125°C
680
6
6
19
µA
Shutdown Supply Current
I
SHDN
µA
12
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Maxim Integrated
│
2
MAX5096/MAX5097
40V, 600mA Buck Converters with Low-
Quiescent-Current Linear Regulator Mode
Electrical Characteristics (continued)
(V
IN
= +14V, I
OUT
= 1mA, C
IN
= 100μF, C
OUT
= 22μF, L = 22μH, C
BP
= 1μF, V
EN
= +2.4V, SGND = PGND = 0V, T
A
= T
J
=
-40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER
BUCK MODE
Supply Current
(Buck Converter On)
Supply Current
(Buck Converter On)
Fixed Output Voltage
ADJ Set Point
ADJ Input Bias Current
Dual Mode ADJ Threshold
Maximum Duty Cycle
Error-Amplifier Transconductance
Adjustable Output Voltage Range
Minimum Output Current
Switch Current Limit
Internal Switch On-Resistance
Switch Leakage Current
Efficiency
Switching Frequency
Synchronization SYNC Input
SYNC Input High Threshold
SYNC Input Low Threshold
SYNC Input Minimum High Pulse
Width
SYNC Input Leakage
LDO MODE
Guaranteed Output Current
I
OUT
(Note 2)
100
mA
V
SYNC
= 11V
I
S
LDO/BUCK = low,
V
ADJ
= 1.4V, MAX5096,
no switching
LDO/BUCK = low,
V
ADJ
= 1.4V, MAX5097,
no switching
135kHz
version
330kHz
version
4.85
3.196
693
980
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
S
720
5
3.3
5
125
62
100
55
1.235
136
600
1.15
1.5
0.9
0.05
85
81
120
300
120
300
2.0
135
330
1000
5.12
3.391
100
µA
V
OUT
V
FB
I
FB
V
ADJTH_R
V
ADJTH_F
D
MAX
Gm
EA
V
ADJ
I
OUT
I
SW_LIM
R
DS(ON)
I
SW_L
η
f
SW
f
SYNC
V
SYNCH
V
SYNCL
5V version, 5.5V ≤ V
IN
≤ 40V, no load
3.3V version, 5.5V ≤ V
IN
≤ 40V, no load
50% duty cycle, no load
V
ADJ
= 1.5V
ADJ rising
ADJ rising
V
ADJ
= 0.5V
V
COMP
= V
ADJ
, I
COMP
= ±10μA
V
IN
= 6.5V to 40V
V
IN
= 6V to 40V
V
IN
= 14V, I
DRAIN
= 100mA
V
EN
= 0V
V
IN
= 14V, V
OUT
= 5V, I
OUT
= 400mA
V
IN
= 14V, V
OUT
= 3.3V, I
OUT
= 400mA
MAX5096
MAX5097
MAX5096
MAX5097
V
BP
= 4V
V
BP
= 4V
V
V
nA
mV
%
210
11.000
µS
mA
1.90
2.1
3
A
Ω
µA
%
148
350
500
500
0.8
kHz
kHz
kHz
kHz
V
V
ns
250
1
µA
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Maxim Integrated
│
3
MAX5096/MAX5097
40V, 600mA Buck Converters with Low-
Quiescent-Current Linear Regulator Mode
Electrical Characteristics (continued)
(V
IN
= +14V, I
OUT
= 1mA, C
IN
= 100μF, C
OUT
= 22μF, L = 22μH, C
BP
= 1μF, V
EN
= +2.4V, SGND = PGND = 0V, T
A
= T
J
=
-40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
5V version, MAX5096B/MAX5097B,
5.5V ≤ V
IN
≤ 40V, I
OUT
= 10mA
3.3V version, MAX5096A/MAX5097A,
4V ≤ V
IN
≤ 40V, I
OUT
= 10mA
I
OUT
= 10mA
V
ADJ
= 4V
I
OUT
= 10mA
I
OUT
= 100mA,
V
OUT
= 0.98 x V
OUT
(nominal) (5V
version only), MAX5096B/MAX5097B
Rising edge of EN to
V
OUT
= 10% V
OUT
(nominal),
R
L
= 500Ω, V
ADJ
= SGND,
V
LDO/BUCK
= 4V, C
SS
= 2nF
ΔV
OUT
/
ΔV
IN
5V version, +5.5V ≤ V
IN
≤ +40V,
I
OUT
= 100mA
3.3V version, +4V ≤ V
IN
≤ +40V,
I
OUT
= 100mA
5V version,
I
OUT
= 100μA to
100mA, V
IN
= 14V
3.3V version,
I
OUT
= 100μA to
100mA, V
IN
= 14V
T
J
= +25°C
T
J
= -40°C to +125°C
T
J
= +25°C
T
J
= -40°C to +125°C
1.237
MIN
4.89
3.219
1.21
TYP
5
3.3
1.2375
0.5
MAX
5.09
3.378
1.26
100
11.000
0.37
UNITS
V
V
V
nA
V
V
Output Voltage
V
OUT
V
ADJ
I
FB
V
ADJ
ΔV
DO
ADJ Set Point
ADJ Input Bias Current
Adjustable Output Voltage Range
Dropout Voltage
Startup Response Time
300
µs
0.125
mV/V
0.093
0.242
0.242
0.164
0.164
60
150
2.0
0.8
330
500
0.374
1
0.237
1
dB
mA
V
V
µA
Clock
Periods
µs
1
32
100
mV/mA
Line Regulation
Load Regulation
ΔV
OUT
/
ΔI
OUT
Power-Supply Rejection Ratio
Short-Circuit Current
LDO/BUCK High Threshold
LDO/BUCK Low Threshold
LDO/BUCK Input Leakage
Transition Timing from LDO Mode
to Buck Mode
Transition Timing from Buck Mode
to LDO Mode
Soft-Start Charge Current
Soft-Start Reference Voltage
EN High-Voltage Threshold
PSRR
I
SC
I
OUT
= 10mA, f = 100Hz, 500mV
P-P
,
V
OUT
= +5V, V
IN
= +14V
V
IN
= 6V
V
LDO/BUCK
= 11V
Falling edge of LDO/BUCK to buck
converter on
Rising edge of LDO/BUCK to LDO
operation
V
SS
= 0.1V
V
OUT
= V
OUT (nominal)
- 20%
EN = high, regulator on
3
0.9
1.4
SOFT-START, ENABLE (EN) AND
RESET
I
SS
V
SS-REF
V
ENH
5
0.99
7
1.1
µA
V
V
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Maxim Integrated
│
4
MAX5096/MAX5097
40V, 600mA Buck Converters with Low-
Quiescent-Current Linear Regulator Mode
Electrical Characteristics (continued)
(V
IN
= +14V, I
OUT
= 1mA, C
IN
= 100μF, C
OUT
= 22μF, L = 22μH, C
BP
= 1μF, V
EN
= +2.4V, SGND = PGND = 0V, T
A
= T
J
=
-40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.) (Note 1)
PARAMETER
EN Low-Voltage Threshold
EN Input Pulldown
RESET
Voltage Threshold High
RESET
Voltage Threshold Low
RESET
Output Low Voltage
RESET
Output High Leakage
Current
RESET
Output Minimum Timeout
Period
V
OUT
to
RESET
Delay
Delay Comparator Threshold
Delay Comparator Threshold
Hysteresis
CT Charge Current
CT Discharge Current
THERMAL SHUTDOWN
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis,
T
J(SHDN)
ΔT
J(SHDN)
Temperature rising
+165
20
°C
°C
I
CH
I
DISCH
V
CT
= 1V
0.74
V
CT_TH
V
RESET_H
V
RESET_L
V
RL
I
RH
SYMBOL
V
ENL
Regulator off
V
EN
= 2V, V
LDO/BUCK
= 4V
V
OUT
rising
V
OUT
falling
I
SINK
= 1mA
V
RESET
= 5V, V
ADJ
= 1.5V
C
CT
= 0
V
OUT
falling 10mV/μs, C
CT
= 0
V
CT
rising
1.18
25
6
1.2374
100
1
13.8
1.20
1.29
89
97
0.5
92
90
94
92
0.2
1
CONDITIONS
MIN
TYP
MAX
0.4
UNITS
V
µA
% V
OUT
% V
OUT
V
µA
µs
µs
V
mV
µA
mA
Note 1:
Limits to -40°C are guaranteed by design.
Note 2:
The continuous maximum output current from LDO is limited by package power dissipation.
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│
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