19-4222; Rev 0; 7/08
2.2MHz, 3A Buck or Boost Converters
with an Integrated High-Side Switch
General Description
The MAX15036/MAX15037 high-frequency, DC-DC con-
verters with an integrated n-channel power MOSFET
provide up to 3A of load current. The MAX15036
includes an internal power MOSFET to enable the
design of a nonsynchronous buck or boost topology
power supply. The MAX15037 is for the design of a
synchronous buck topology power supply. These
devices operate from a 4.5V to 5.5V or 5.5V to 23V
input voltage and offer the ability to set the switching
frequency from 200kHz to 2.2MHz with an external
resistor. The voltage-mode architecture with a peak
switch current-limit scheme provides stable operation
up to a 2.2MHz switching frequency. The MAX15036
includes a clock output for driving a second DC-DC
converter 180° out-of-phase and a power-on-reset
(RESET) output. The MAX15037 includes a power-good
output and a synchronous rectifier driver to drive an
external low-side MOSFET in the buck converter config-
uration for high efficiency.
The MAX15036/MAX15037 protect against overcurrent
conditions by utilizing a peak current limit as well as
overtemperature shutdown providing a very reliable
and compact power source for point-of-load regulation
applications. Additional features include synchroniza-
tion, internal digital soft-start, and an enable input. The
MAX15036/MAX15037 are available in a thermally
enhanced, space-saving 16-pin TQFN (5mm x 5mm)
package and operate over the -40°C to +125°C tem-
perature range.
Features
o
4.5V to 5.5V or 5.5V to 23V Input Voltage Range
o
Output Voltage Adjustable Down to 0.6V (Buck) or
Up to 28V (Boost)
o
3A Output Current
o
Synchronous Rectifier Driver Output (MAX15037)
for Higher Efficiency
o
Resistor-Programmable Switching Frequency
from 200kHz to 2.2MHz
o
External Synchronization and Enable (On/Off)
Inputs
o
Clock Output for Driving Second Converter 180°
Out-Of-Phase (MAX15036)
o
Integrated 150mΩ High-Side n-Channel Power
MOSFET
o
Power-On-Reset Output (MAX15036)/Power-Good
Output (MAX15037)
o
Short-Circuit Protection (Buck)/Maximum Duty-
Cycle Limit (Boost)
o
Thermal-Shutdown Protection
o
Thermally Enhanced 16-Pin TQFN Package
Dissipates 2.7W
MAX15036/MAX15037
Ordering Information
PART
MAX15036ATE+
MAX15037ATE+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
+Denotes
a lead-free/RoHS-compliant package.
*EP
= Exposed pad.
Applications
Automotive Radio Power Supplies
Servers and Networks
IP Phones/WLAN Access Points
TOP VIEW
SOURCE
Pin Configurations
PGND
SGND
10
CKO
9
xDSL Modem Power Supplies
12
11
Selector Guide
PART
MAX15036ATE
CONFIGURATION
Nonsynchronous
Buck or Boost
Synchronous Buck
FEATURES
RESET
Output,
Clock Output
PGOOD Output,
Synchronous FET
Driver
SYNC 13
RESET 14
BST/VDD 15
EN 16
8
7
V
L
V+
BYPASS
OSC
MAX15036
6
5
+
EP*
1
DRAIN
2
DRAIN
3
COMP
4
FB
MAX15037ATE
Pin Configurations continued at end of data sheet.
*EXPOSED PAD.
THIN QFN
5mm x 5mm
________________________________________________________________
Maxim Integrated Products
1
For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
2.2MHz, 3A Buck or Boost Converters
with an Integrated High-Side Switch
MAX15036/MAX15037
ABSOLUTE MAXIMUM RATINGS
V+ to PGND............................................................-0.3V to +25V
BST/VDD, DRAIN to SGND ....................................-0.3V to +30V
SGND to PGND .....................................................-0.3V to +0.3V
BST/VDD to SOURCE...............................................-0.3V to +6V
SOURCE to SGND..................................................-0.6V to +25V
SOURCE or DRAIN Maximum Peak Current...............5A for 1ms
V
L
to SGND ................-0.3V to the lower of +6V and (V+ + 0.3V)
SYNC, EN, DL, CKO, OSC, COMP,
FB to SGND...............................................-0.3V to (V
L
+ 0.3V)
BYPASS, CKO, OSC, COMP, FB, EN, SYNC,
RESET,
PGOOD Maximum Input Current .................................±50mA
RESET,
PGOOD to SGND ........................................-0.3V to +6V
BYPASS to SGND..................................................-0.3V to +2.2V
V
L
and BYPASS Short-Circuit Duration to SGND ......Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TQFN (derate 33mW/°C above +70°C) ..........2666mW
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1)
16-Pin TQFN................................................................1.7°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)
16-Pin TQFN.................................................................30°C/W
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature Range ............................-65°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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
http://www.maxim-ic.com/thermal-tutorial.
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.
ELECTRICAL CHARACTERISTICS
(V+ = V
L
= 5V or V+ = 5.5V to 23V, V
EN
= 5V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Circuits of Figures 5 and 6. Typical
values are at T
A
= T
J
= +25°C.) (Note 2)
PARAMETER
SYSTEM SPECIFICATIONS
Input Voltage Range
V+ Operating Supply Current
V+
I
Q
5.5
V+ = V
L
V+ = 12V, V
FB
= 0.8V
R
OSC
= 10kΩ, no switching
V+ = 12V, V
EN
= 0V, PGOOD
(MAX15037),
RESET,
CKO unconnected
(MAX15036), R
OSC
= 10kΩ
Nonsynchronous (MAX15036),
f
SW
= 1.25MHz, V+ = 12V, I
OUT
= 1.5A,
V
OUT
= 3.3V
Synchronous (MAX15037),
f
SW
= 300kHz, V+ = 12V, I
OUT
= 1.5A,
V
OUT
= 3.3V
V
L
REGULATOR (V
L
)/BYPASS OUTPUT (BYPASS)
V
L
Undervoltage Lockout
V
L
Undervoltage Lockout
Hysteresis
V
L
Output Voltage
V
L
Regulator Short-Circuit
Current
BYPASS Output Voltage
BYPASS Load Regulation
V
UVLO
V
HYST
V
L
I
VLSHORT
V
BYPASS
ΔV
BYPASS
V+ = 5.5V to 23V, I
VL
= 0 to 40mA
V
IN
= 5.5V
V+ = V
L
= 5.2V, I
BYPASS
= 0
I
BYPASS
steps from 0 to 50μA,
V+ = V
L
= 5.2V
1.98
0
5.0
V
L
falling
4.1
137
5.2
110
2
1.2
2.02
5
5.5
4.3
V
mV
V
mA
V
mV
4.5
1.8
23.0
5.5
2.5
V
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+ Standby Supply Current
I
STBY
1
1.4
mA
79
%
90
Efficiency
η
2
_______________________________________________________________________________________
2.2MHz, 3A Buck or Boost Converters
with an Integrated High-Side Switch
ELECTRICAL CHARACTERISTICS (continued)
(V+ = V
L
= 5V or V+ = 5.5V to 23V, V
EN
= 5V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Circuits of Figures 5 and 6. Typical
values are at T
A
= T
J
= +25°C.) (Note 2)
PARAMETER
SOFT-START
Digital Soft-Start Period
Soft-Start Steps
ERROR AMPLIFIER (FB and COMP)
FB to COMP Transconductance
FB Input Bias Current
FB Input Voltage Set Point
COMP Sink-and-Source Current
Capability
INTERNAL MOSFETs
On-Resistance n-Channel Power
MOSFET
Leakage Current
Minimum Output Current
Peak Current Limit
On-Resistance Internal Low-Side
Switch
On-Resistance nMOS
On-Resistance pMOS
Peak Sink Current
Peak Source Current
Clock Output-High Level
Clock Output-Low Level
Clock Output Phase Delay With
Respect to SOURCE Waveform
R
ON
I
LEAK
I
OUT
I
LIMIT
R
ONLSW
I
SWITCH
= 50mA, V+ = V
L
= 5.2V
V+ = V
L
= 5.2V, I
SINK
= 100mA
V
EN
= 0V, V
DRAIN
= 23V,
SOURCE = PGND
V
OUT
= 3.3V, V+ = 12V (Note 3)
3.56
3
4.6
20
5.6
40
0.150
0.302
20
Ω
μA
A
A
Ω
g
M
I
FB
V
FB
I
COMP
0.591
100
0.600
150
1.20
1.8
2.75
250
0.609
mS
nA
V
μA
Internal 6-bit DAC
4096
64
Clock
periods
Steps
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX15036/MAX15037
SYNCHRONOUS RECTIFIER DRIVER (DL) (MAX15037 Only)
R
ONDLN
R
ONDLP
I
IDL_SINK
I
IDL_SOURCE
V
CKOH
V
CKOL
CKO
PHASE
V
L
= 5.2V, I
SOURCE
= 5mA
V
L
= 5.2V, I
SINK
= 5mA
R
OSC
= 10kΩ, SYNC = GND
(Note 4)
R
OSC
= 5.62kΩ
Switching Frequency
Minimum Controllable On-Time
Maximum Duty Cycle
f
SW
t
ON_MIN
D
MAX
f
SW
= 2.2MHz
82
V+ = V
L
= 5.2V
R
OSC
= 41.2kΩ
R
OSC
= 10kΩ
1130
115
3.54
0.4
I
SINK
= 10mA
I
SOURCE
= 10mA
1
1.9
1
0.75
4
5
Ω
Ω
A
A
V
V
Degrees
CLOCK OUTPUT (CKO) (MAX15036 Only)
OSCILLATOR (OSC)/SYNCHRONIZATION (SYNC)
2100
312
1250
120
87.5
1380
ns
%
kHz
_______________________________________________________________________________________
3
2.2MHz, 3A Buck or Boost Converters
with an Integrated High-Side Switch
MAX15036/MAX15037
ELECTRICAL CHARACTERISTICS (continued)
(V+ = V
L
= 5V or V+ = 5.5V to 23V, V
EN
= 5V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Circuits of Figures 5 and 6. Typical
values are at T
A
= T
J
= +25°C.) (Note 2)
PARAMETER
SYNC Frequency Range
SYNC Input to SOURCE Rising-
Edge Phase Delay
SYNC High Threshold
SYNC Low Threshold
SYNC Input Bias Current
Minimum SYNC High Pulse Width
SYNC
PHASE
V
SYNCH
V
SYNCL
I
SYNC
t
SYNC_H
V
IH
V
IL
I
EN
V
TH
V
TH
t
FD
t
RP
V
OL
I
LEAK
I
SINK
= 3mA
V+ = V
L
= 5.2V, V
R ESET
or
V
PGOOD
= 6V, V
FB
= 0.8V
Temperature rising
+170
25
140
V
FB
= V
OUT
(Note 7)
V
FB
= V
OUT
(Note 7)
90
90
92.5
92.5
3
200
254
0.4
2
2.0
0.8
250
95
95
100
SYMBOL
(Note 5)
R
OSC
= 10kΩ, f
SYNC
= 1.2MHz
(Note 6)
2.0
0.8
250
CONDITIONS
MIN
200
65
TYP
MAX
2200
UNITS
kHz
Degrees
V
V
nA
ns
EN,
RESET
(MAX15036)/PGOOD (MAX15037)
EN Threshold
EN Input Bias Current
RESET
Threshold
PGOOD Threshold
FB to
RESET
or FB to PGOOD
Propagation Delay
RESET
Active Timeout Period
RESET,
PGOOD Output Voltage
Low
RESET,
PGOOD Output Leakage
Current
THERMAL SHUTDOWN
Thermal Shutdown
Thermal-Shutdown Hysteresis
T
SHDN
°C
°C
V
nA
% V
OUT
% V
OUT
μs
ms
V
μA
Note 2:
100% tested at T
A
= +25°C and T
A
= +125°C. Limits from T
A
= -40°C to +25°C are guaranteed by design.
Note 3:
Output current may be limited by the power dissipation of the package. See the
Power Dissipation
section in the
Applications
Information
section.
Note 4:
From the rising edge of the SOURCE waveform to the rising edge of the CKO waveform.
Note 5:
SYNC input frequency is equal to the switching frequency.
Note 6:
From the SYNC rising edge to SOURCE rising edge.
Note 7:
RESET
goes high 200ms after V
OUT
crosses this threshold, PGOOD goes high after V
OUT
crosses this threshold.
4
_______________________________________________________________________________________
2.2MHz, 3A Buck or Boost Converters
with an Integrated High-Side Switch
Typical Operating Characteristics
(V+ = V
L
= 5.2V, T
A
= +25°C, Figures 5 and 6, unless otherwise noted.)
MAX15036 BUCK EFFICIENCY vs. OUTPUT
CURRENT (V
IN
= 5.5V, f
SW
= 2.2MHz)
MAX15036 toc01
MAX15036/MAX15037
MAX15036 BUCK EFFICIENCY vs. OUTPUT
CURRENT (V
IN
= 12V, f
SW
= 2.2MHz)
MAX15036 toc02
MAX15036 BUCK EFFICIENCY vs. OUTPUT
CURRENT (V
IN
= 16V, f
SW
= 2.2MHz)
V
OUT
= 3.3V
MAX15036 toc03
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
2.5
V
OUT
= 3.3V
V
OUT
= 2.5V
80
70
60
EFFICIENCY (%)
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
OUTPUT CURRENT (A)
2.5
V
OUT
= 3.3V
70
60
50
EFFICIENCY (%)
40
30
20
10
0
V
OUT
= 2.5V
V
OUT
= 2.5V
3.0
3.0
0
0.5
OUTPUT CURRENT (A)
1.0
1.5
2.0
OUTPUT CURRENT (A)
2.5
3.0
MAX15037 SYNCHRONOUS
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= 12V, f
SW
= 330kHz, L = 15μH)
MAX15036 toc04
MAX15037 SYNCHRONOUS EFFICIENCY vs. OUTPUT
CURRENT (V
IN
= 12V, f
SW
= 2.2MHz, L = 4.7μH)
V
OUT
= 3.3V
70
60
EFFICIENCY (%)
MAX15036 toc05
MAX15036 toc07
95
90
85
EFFICIENCY (%)
80
75
70
65
60
55
L = TOKO DS126C2-150M
50
0
0.5
1.0
1.5
2.0
OUTPUT CURRENT (A)
2.5
V
OUT
= 1.2V
V
OUT
= 2.5V
V
OUT
= 3.3V
80
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
OUTPUT CURRENT (A)
2.5
3.0
3.0
MAX15037 OUTPUT VOLTAGE vs. OUTPUT
CURRENT (V
IN
= 12V, V
OUT
= 3.3V, f
SW
= 2.2MHz)
3.300
3.299
OUTPUT VOLTAGE (V)
3.298
3.297
3.296
3.295
3.294
3.293
3.292
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT CURRENT (A)
V
L
(V)
MAX15036 toc06
V
L
OUTPUT VOLTAGE
vs. SWITCHING FREQUENCY
5.190
5.185
5.180
5.175
5.170
5.165
5.160
5.155
5.150
100
600
1100
1600
2100
SWITCHING FREQUENCY (kHz)
V
IN
= 5.5V
V
IN
= 23V
3.301
_______________________________________________________________________________________
5
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