MAX15037ATE+ Maxim Integrated Products, MAX15037ATE+ Datasheet

IC DC/DC CONV 3A 16-TQFN-EP

MAX15037ATE+

Manufacturer Part Number
MAX15037ATE+
Description
IC DC/DC CONV 3A 16-TQFN-EP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX15036ATEVT.pdf (25 pages)

Specifications of MAX15037ATE+

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
0.6 ~ 23 V
Current - Output
3A
Frequency - Switching
200kHz ~ 2.2MHz
Voltage - Input
4.5 ~ 23 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Power - Output
2.67W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-4222; Rev 0; 7/08
Pin Configurations continued at end of data sheet.
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.
MAX15036ATE
MAX15037ATE
PART
xDSL Modem Power Supplies
Automotive Radio Power Supplies
Servers and Networks
IP Phones/WLAN Access Points
CONFIGURATION
Synchronous Buck
________________________________________________________________ Maxim Integrated Products
Nonsynchronous
Buck or Boost
General Description
2.2MHz, 3A Buck or Boost Converters
with an Integrated High-Side Switch
Selector Guide
Applications
Synchronous FET
PGOOD Output,
RESET Output,
Clock Output
FEATURES
Driver
o 4.5V to 5.5V or 5.5V to 23V Input Voltage Range
o Output Voltage Adjustable Down to 0.6V (Buck) or
o 3A Output Current
o Synchronous Rectifier Driver Output (MAX15037)
o Resistor-Programmable Switching Frequency
o External Synchronization and Enable (On/Off)
o Clock Output for Driving Second Converter 180°
o Integrated 150mΩ High-Side n-Channel Power
o Power-On-Reset Output (MAX15036)/Power-Good
o Short-Circuit Protection (Buck)/Maximum Duty-
o Thermal-Shutdown Protection
o Thermally Enhanced 16-Pin TQFN Package
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
MAX15036ATE+
MAX15037ATE+
Up to 28V (Boost)
for Higher Efficiency
from 200kHz to 2.2MHz
Inputs
Out-Of-Phase (MAX15036)
MOSFET
Output (MAX15037)
Cycle Limit (Boost)
Dissipates 2.7W
TOP VIEW
*EXPOSED PAD.
BST/VDD
PART
RESET
SYNC
EN
13
14
15
16
+
12
-40°C to +125°C
-40°C to +125°C
1
TEMP RANGE
Ordering Information
EP*
5mm x 5mm
THIN QFN
MAX15036
11
2
Pin Configurations
10
3
9
4
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
Features
8
7
6
5
V
V+
BYPASS
OSC
L
1

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MAX15037ATE+ Summary of contents

Page 1

... 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 PART MAX15036ATE+ MAX15037ATE+ + Denotes a lead-free/RoHS-compliant package Exposed pad. Applications TOP VIEW SYNC RESET FEATURES RESET Output, BST/VDD ...

Page 2

Buck or Boost Converters with an Integrated High-Side Switch 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 ...

Page 3

Buck or Boost Converters with an Integrated High-Side Switch ELECTRICAL CHARACTERISTICS (continued) ( 5.5V to 23V values are +25°C.) (Note ...

Page 4

Buck or Boost Converters with an Integrated High-Side Switch ELECTRICAL CHARACTERISTICS (continued) ( 5.5V to 23V values are +25°C.) (Note ...

Page 5

Buck or Boost Converters with an Integrated High-Side Switch ( 5.2V +25°C, Figures 5 and 6, unless otherwise noted MAX15036 BUCK EFFICIENCY vs. OUTPUT CURRENT (V = 5.5V 2.2MHz) ...

Page 6

Buck or Boost Converters with an Integrated High-Side Switch ( 5.2V +25°C, Figures 5 and 6, unless otherwise noted MAX15037 V DROPOUT VOLTAGE L vs. SWITCHING FREQUENCY 0. 5.5V ...

Page 7

Buck or Boost Converters with an Integrated High-Side Switch ( 5.2V +25°C, Figures 5 and 6, unless otherwise noted MAX15037 SOFT-START AND SHUTDOWN (I = 2A) OUT MAX15036 toc15 V = ...

Page 8

Buck or Boost Converters with an Integrated High-Side Switch PIN NAME Internal Power MOSFET Drain Connection. Buck converter operation—use the MOSFET as a high-side switch 1, 2 DRAIN and connect DRAIN to the input supply. Boost converter operation ...

Page 9

Buck or Boost Converters with an Integrated High-Side Switch V+ DRAIN SYNC CKO OSCILLATOR OSC 2V 1V BYPASS PWM COMPARATOR V REF EN DIGITAL SOFT-START MAX15036 Figure 1. MAX15036 Block Diagram _______________________________________________________________________________________ CURRENT-LIMIT COMPARATOR 4-PULSE SKIP R Q ...

Page 10

Buck or Boost Converters with an Integrated High-Side Switch V+ DRAIN SYNC OSCILLATOR OSC 2V 1V BYPASS PWM COMPARATOR V REF EN DIGITAL SOFT-START MAX15037 Figure 2. MAX15037 Block Diagram 10 ______________________________________________________________________________________ CURRENT-LIMIT COMPARATOR 4-PULSE SKIP R Q ...

Page 11

Buck or Boost Converters with an Integrated High-Side Switch Detailed Description The MAX15036/MAX15037 use a pulse-width modula- tion (PWM) voltage-mode control scheme. The MAX15036 is a nonsynchronous converter and uses an external low-forward-drop Schottky diode for rectifica- tion. ...

Page 12

Buck or Boost Converters with an Integrated High-Side Switch active-high input that turns the MAX15036/ MAX15037 on and off TTL-logic input with 2.0V and 0.8V logic-high and low levels, respectively. When EN ...

Page 13

Buck or Boost Converters with an Integrated High-Side Switch At high input-to-output differential, and high switching frequency, the on-time drops to the order of 100ns. Even though the MAX15036/MAX15037 can control the on-time as low as 100ns, the ...

Page 14

Buck or Boost Converters with an Integrated High-Side Switch Effective Input Voltage Range The MAX15036/MAX15037 can operate with input sup- plies ranging from 4.5V to 5.5V or 5.5V to 23V. The input voltage range (V+) can be constrained ...

Page 15

Buck or Boost Converters with an Integrated High-Side Switch The input ripple comprises mainly of ΔV capacitor discharge) and ΔV (caused by the ESR of ESR the input capacitor). The total voltage ripple is the sum of ΔV ...

Page 16

Buck or Boost Converters with an Integrated High-Side Switch Choose the minimum inductor value so the converter remains in continuous mode operation at minimum out- put current (I ). OUTMIN 2 × × ...

Page 17

Buck or Boost Converters with an Integrated High-Side Switch For the boost converter +(I RMS_MOSFET × V OUT = − ...

Page 18

Buck or Boost Converters with an Integrated High-Side Switch lower than f and close to f ZESR C compensation network where zero (f ) and R C provides a high-frequency pole. ...

Page 19

Buck or Boost Converters with an Integrated High-Side Switch V OUT R1 R2 Figure 3. Type II Compensation Network V OUT Figure 4. Type III Compensation Network ______________________________________________________________________________________ REF ...

Page 20

Buck or Boost Converters with an Integrated High-Side Switch Boost Converter Compensation The boost converter compensation gets complicated due to the presence of a right-half-plane zero f The right-half-plane zero causes a drop in-phase while adding positive (+1) ...

Page 21

Buck or Boost Converters with an Integrated High-Side Switch side of the PCB. Do not make a direct connection of the exposed pad copper plane to the SGND (pin 10) underneath the IC. Connect this plane and SGND ...

Page 22

Buck or Boost Converters with an Integrated High-Side Switch Figure 5. MAX15036 Buck Configuration 22 ______________________________________________________________________________________ ...

Page 23

Buck or Boost Converters with an Integrated High-Side Switch Figure 6. MAX15037 Buck Configuration ______________________________________________________________________________________ 23 ...

Page 24

Buck or Boost Converters with an Integrated High-Side Switch VOUT VOUT C12 C11 0.1μF 22μF PGND VIN VIN C1 C2 47μF 10μF PGND 35V VOUT R3 R1 1kΩ 27.4kΩ 560pF R2 6.04kΩ 1% Figure 7. ...

Page 25

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 25 © 2008 Maxim Integrated Products ...

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