MAX15016AATX+ Maxim Integrated Products, MAX15016AATX+ Datasheet

IC DC/DC CONV 1A 36-TQFN-EP

MAX15016AATX+

Manufacturer Part Number
MAX15016AATX+
Description
IC DC/DC CONV 1A 36-TQFN-EP
Manufacturer
Maxim Integrated Products
Type
Step-Down (Buck)r
Datasheet
1.MAX15017AATX.pdf (26 pages)

Specifications of MAX15016AATX+

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
2
Voltage - Output
1.26 ~ 32 V
Current - Output
1A
Frequency - Switching
135kHz ~ 500kHz
Voltage - Input
4.5 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
36-TQFN Exposed Pad
Power - Output
2.1W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX15014–MAX15017 combine a step-down DC-
DC converter and a 50mA, low-quiescent-current low-
dropout (LDO) regulator. The LDO regulator is ideal for
powering always-on circuitry in automotive applications.
The DC-DC converter input voltage range is 4.5V to 40V
for the MAX15015/MAX15016, and 7.5V to 40V for the
MAX15014/MAX15017.
The DC-DC converter output is adjustable from 1.26V to
32V and can deliver up to 1A of load current. These
devices utilize a feed-forward voltage-mode control
scheme for good noise immunity in the high-voltage
switching environment and offer external compensation
allowing for maximum flexibility with a wide selection of
inductor values and capacitor types. The switching
frequency is internally fixed at 135kHz and 500kHz,
depending on the version chosen. Moreover, the
switching frequency can be synchronized to an exter-
nal clock signal through the SYNC input. Light load effi-
ciency is improved by automatically switching to a
pulse-skip mode. The soft-start time is adjustable with
an external capacitor. The DC-DC converter can be
disabled independent of the LDO, thus reducing the
quiescent current to 47µA (typ).
The LDO linear regulators operate from 5V to 40V and
deliver a guaranteed 50mA load current. The devices
feature a preset output voltage of 5V (MAX1501_A) or
3.3V (MAX1501_B). Alternatively, the output voltage
can be adjusted from 1.5V to 11V by using an external
resistive divider. The LDO section also features a
RESET output with adjustable timeout period.
Protection features include cycle-by-cycle current limit,
hiccup-mode output short-circuit protection, and thermal
shutdown. All devices are available in a space-saving,
high-power (2.86W), 36-pin TQFN package and are
rated for operation over the -40°C to +125°C automotive
temperature range.
19-0734; Rev 0; 1/07
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.
Car Radios
Automotive Body Control Modules
Automotive Instrument Cluster
Navigation Systems
1A, 4.5V to 40V Input Buck Converters with
________________________________________________________________ Maxim Integrated Products
General Description
Applications
50mA Auxiliary LDO Regulators
o Combined DC-DC Converters and Low-Quiescent-
o 1A DC-DC Converters Operate from 4.5V to 40V
o Switching Frequency of 135kHz
o 50mA LDO Regulator Operates from 5V to 40V
o 47µA Quiescent Current with DC-DC Converter
o 6µA System Shutdown Current
o Frequency Synchronization Input
o Shutdown/Enable Inputs
o Adjustable Soft-Start Time
o Active-Low Open-Drain R R E E S S E E T T Output with
o Thermal Shutdown and Output Short-Circuit
o Space-Saving (6mm x 6mm) Thermally Enhanced
+ Denotes a lead-free package.
* EP = Exposed pad.
MAX15014AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3
MAX15014BATX+
MAX15015AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3
MAX15015BATX+
MAX15016AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3
MAX15016BATX+
MAX15017AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3
MAX15017BATX+
Current LDO Regulators
(MAX15015/MAX15016) or 7.5V to 40V
(MAX15014/MAX15017)
(MAX15014/MAX15016) or 500kHz
(MAX15015/MAX15017)
Independent of the DC-DC Converter
Off and LDO On
Programmable Timeout Delay
Protection
36-Pin TQFN Package
PART
-40°C to +125°C 36 TQFN-EP* T3666-3
-40°C to +125°C 36 TQFN-EP* T3666-3
-40°C to +125°C 36 TQFN-EP* T3666-3
-40°C to +125°C 36 TQFN-EP* T3666-3
TEMP RANGE
Ordering Information
PIN-
PACKAGE
Features
CODE
PKG
1

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MAX15016AATX+ Summary of contents

Page 1

... Space-Saving (6mm x 6mm) Thermally Enhanced 36-Pin TQFN Package PART MAX15014AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3 MAX15014BATX+ MAX15015AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3 MAX15015BATX+ MAX15016AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3 MAX15016BATX+ Applications MAX15017AATX+ -40°C to +125°C 36 TQFN-EP* T3666-3 MAX15017BATX+ + Denotes a lead-free package Exposed pad. ...

Page 2

Input Buck Converters with 50mA Auxiliary LDO Regulators ABSOLUTE MAXIMUM RATINGS IN_SW, IN_LDO, DRAIN, EN_SYS, EN_SW to SGND ..............................................................-0.3V to +45V IN_LDO to IN_SW ..................................................-0.3V to +0. SGND ...........................................-0. PGND ...

Page 3

Input Buck Converters with ELECTRICAL CHARACTERISTICS (continued 14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO Typical values are +25°C.) ...

Page 4

Input Buck Converters with 50mA Auxiliary LDO Regulators ELECTRICAL CHARACTERISTICS (continued 14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO Typical values are ...

Page 5

Input Buck Converters with ELECTRICAL CHARACTERISTICS (continued 14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO Typical values are +25°C.) ...

Page 6

Input Buck Converters with 50mA Auxiliary LDO Regulators ELECTRICAL CHARACTERISTICS (continued 14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO Typical values are ...

Page 7

Input Buck Converters with ( =14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO SYSTEM SHUTDOWN CURRENT vs. TEMPERATURE 10 MAX15016 ...

Page 8

Input Buck Converters with 50mA Auxiliary LDO Regulators ( =14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO TURN-ON/-OFF WAVEFORM INCREASING V IN MAX15014 toc10 ...

Page 9

Input Buck Converters with ( =14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO LX VOLTAGE AND INDUCTOR CURRENT MAX150_ 2µs/div LX ...

Page 10

Input Buck Converters with 50mA Auxiliary LDO Regulators ( =14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO DROPOUT VOLTAGE vs. LOAD CURRENT 900 V ...

Page 11

Input Buck Converters with ( =14V, V IN_SW IN_LDO DRAIN EN_SYS 1µ 0.1µ 0.1µF, C IN_SW IN_LDO LDO TURN-ON/-OFF WAVEFORM WITH INCREASING 5mA LOAD 0V ...

Page 12

Input Buck Converters with 50mA Auxiliary LDO Regulators PIN NAME MAX15014/ MAX15015/ MAX15017 MAX15016 12 12, 14, 16, 19, 24, 14, 16, 19, 24, N.C. 26, 27, 30, ...

Page 13

Input Buck Converters with PIN NAME MAX15014/ MAX15015/ MAX15017 MAX15016 — DVREG — SYNC 31 31 COMP REG 36 36 ...

Page 14

Input Buck Converters with 50mA Auxiliary LDO Regulators Detailed Description The MAX15014–MAX15017 combine a voltage-mode buck converter with an internal 0.5Ω power MOSFET switch and a low-quiescent-current LDO regulator. The buck converter of the MAX15015/MAX15016 has ...

Page 15

Input Buck Converters with IN_SW IN_LDO 7.0V OR 4.1V V REFOK V INT V INTOK - 4. REG REG_LDO REFOK V INTOK VINT + V REF VREG_OK UVLO_SW - EN_SW SHDN V V INT ...

Page 16

Input Buck Converters with 50mA Auxiliary LDO Regulators Soft-Start and Reference (SS the 1.235V reference bypass connection for the MAX15014–MAX15017 and also controls the soft-start period. At startup, after input voltage is applied at ...

Page 17

Input Buck Converters with feature a preset output voltage of 5V (MAX1501_A) or 3.3V (MAX1501_B). Alternatively, the output voltage can be adjusted using an external resistive-divider net- work connected between LDO_OUT, SET_LDO, and SGND. See Figure ...

Page 18

Input Buck Converters with 50mA Auxiliary LDO Regulators V ∆ ESR ESR = I + OUT MAX _ I × OUT MAX ∆ × where C is the ...

Page 19

Input Buck Converters with The following equations define the power modulator MOD RAMP × × π × OUT ZESR ...

Page 20

Input Buck Converters with 50mA Auxiliary LDO Regulators f occurs between f and this region, the com pensator gain ( due primarily to C6 and R5. ...

Page 21

... THQ − where V = delay comparator threshold (rising) = CT-TH 1.241V (typ charge current = CT-THQ (typ seconds and Farads Dual Mode is a trademark of Maxim Integrated Products, Inc. ______________________________________________________________________________________ 50mA Auxiliary LDO Regulators and f is approxi therefore × Figure 5. Setting the Output Voltage Using a Resistive Divider 1 − ...

Page 22

Input Buck Converters with 50mA Auxiliary LDO Regulators R6 R3 4.5V TO 40V 40V R4 PGND SGND REG 0.47µF Figure 6. MAX15015/MAX15016 Typical Application Circuit (4.5V ...

Page 23

Input Buck Converters with R6 R3 7.5V TO 40V 7.5V TO 40V R4 PGND SGND REG 0.47µF Figure 7. MAX15014/MAX15017 Typical Application Circuit (7.5V to 40V Input-Voltage Operation) ...

Page 24

Input Buck Converters with 50mA Auxiliary LDO Regulators Pin Configuration TOP VIEW 1 N.C. + N.C. 2 N.C. 3 RESET 4 SGND 5 MAX15014–MAX15017 CT 6 EN_SW 7 EN_SYS 8 EP* N.C. 9 TQFN ( ) ...

Page 25

Input Buck Converters with (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ 50mA Auxiliary LDO Regulators Package Information 25 ...

Page 26

... 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. 26 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products Package Information (continued registered trademark of Maxim Integrated Products, Inc ...

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