MAX17020ETJ+T Maxim Integrated Products, MAX17020ETJ+T Datasheet

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MAX17020ETJ+T

Manufacturer Part Number
MAX17020ETJ+T
Description
IC CTLR PWM DUAL STEP DN 32-TQFN
Manufacturer
Maxim Integrated Products
Series
Quick-PWM™r
Datasheet
1.MAX17020ETJT.pdf (34 pages)

Specifications of MAX17020ETJ+T

Applications
Power Supplies
Current - Supply
1mA
Voltage - Supply
6 V ~ 24 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
32-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-4118; Rev 2; 2/09
The MAX17020 is a dual Quick-PWM™ step-down
power-supply (SMPS) controller with synchronous rec-
tification, intended for main 5V/3.3V or I/O 1.5V/1.05V
power generation in battery-powered systems. Low-
side MOSFET sensing provides a simple low-cost,
highly efficient current sense for valley current-limit
protection. Combined with the output overvoltage and
undervoltage protection features, this current limit
ensures robust output supplies.
The 5V/3.3V or 1.5V/1.05V SMPS outputs can save
power by operating in pulse-skipping mode or in ultra-
sonic mode to avoid audible noise. Ultrasonic mode
forces the controller to maintain switching frequencies
greater than 20kHz at light loads.
An internal 100mA linear regulator can be used to
either generate the 5V bias needed for power-up or
other lower power “always-on” suspend supplies. An
independent bypass input allows automatic bypassing
of the linear regulator when the SMPS is active.
This main controller also includes a secondary feed-
back input that triggers an ultrasonic pulse (DL1 turned
on) if the SECFB voltage drops below its threshold volt-
age. This refreshes an external charge pump driven by
DL1 without overcharging the output voltage.
The device includes independent shutdown controls to
simplify power-up and power-down sequencing. To
prevent current surges at startup, the internal voltage
target is slowly ramped up from zero to the final target
over a 1ms period. To prevent the output from ringing
below ground in shutdown, the internal voltage target
is ramped down from its previous value to zero over a
1ms period. Two independent power-good outputs
simplify the interface with external controllers.
The MAX17020 is a pin-for-pin replacement of the
MAX8778.
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.
Notebook Computers
Main System Supply (5V and 3.3V Supplies)
I/O System Supply (1.5V and 1.05V Supplies)
Graphic Cards
DDR1, DDR2, DDR3 Power Supplies
Game Consoles
Low-Power I/O and Chipset Supplies
Two-to-Four Li+ Cell Battery-Powered Devices
PDAs and Mobile Communicators
Telecommunication
________________________________________________________________ Maxim Integrated Products
Dual Quick-PWM Step-Down Controller
General Description
with Low-Power LDO, RTC Regulator
Applications
o
o
o
o
o
o
o
o
o
o
o
o
o
o
o
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
M AX 17020E TJ+
TOP VIEW
Dual Quick-PWM
Internal 100mA 5V or Adjustable Linear Regulator
Independent LDO Bypass Input
Internal Boost Diodes
Secondary Feedback Input Maintains Charge Pump
3.3V 5mA RTC Power (Always On)
OUT1: 5V or 1.5V Fixed or 0.7V Adjustable
OUT2: 3.3V or 1.05V Fixed or Dynamic Adjustable
Dynamic 0V to 2V REFIN2 Input on Second SMPS
2V ±1% 50µA Reference
6V to 24V Input Range (28V max)
Ultrasonic Mode
Independent SMPS and LDO Enable Controls
Independent SMPS Power-Good Outputs
Minimal Component Count
Feedback
PART
A "+" SIGN FIRST-PIN INDICATOR DENOTES A LEAD-FREE PACKAGE.
PGOOD2
REFIN2
ILIM2
OUT2
SKIP
DH2
ON2
LX2
25
26
27
28
29
30
31
32
+
24
1
23
THIN QFN (T3255-4)
2
-40°C to +85°C
TEMP RANGE
Ordering Information
22
3
5mm x 5mm
MAX17020
21
4
Pin Configuration
20
5
19
6
18
7
17
8
PIN-PACKAGE
16
15
14
13
12
11
10
9
Features
32 TQFN
LX1
DH1
ON1
PGOOD1
ILIM1
FB1
OUT1
BYP
1

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MAX17020ETJ+T Summary of contents

Page 1

... Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. TOP VIEW Applications PGOOD2 OUT2 ILIM2 REFIN2 A "+" SIGN FIRST-PIN INDICATOR DENOTES A LEAD-FREE PACKAGE. Quick-PWM is a trademark of Maxim Integrated Products, Inc. Features Ordering Information TEMP RANGE PIN-PACKAGE -40°C to +85°C 32 TQFN Pin Configuration 24 23 ...

Page 2

... OUT1 Output Voltage Accuracy (Note 1) OUT1 Voltage Adjust Range FB1 Dual-Mode™ Threshold Voltage Levels FB1 Input Bias Current Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 _______________________________________________________________________________________ BST1 to LX1..............................................................-0.3V to +6V DH2 to LX2 ..............................................-0. BST2 to LX2..............................................................-0.3V to +6V LDO, RTC, REF Short Circuit to GND.........................Momentary RTC Current Continuous ...

Page 3

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = V (Note 3) PARAMETER ...

Page 4

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = V (Note 3) PARAMETER ...

Page 5

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = V (Note 3) PARAMETER ...

Page 6

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = V (Note 3) PARAMETER ...

Page 7

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ELECTRICAL CHARACTERISTICS (Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = V PARAMETER SYMBOL INPUT SUPPLIES ...

Page 8

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = V PARAMETER SYMBOL LINEAR ...

Page 9

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, V LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = V PARAMETER SYMBOL OUT2 ...

Page 10

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator (Circuit of Figure 12V OUTPUT EFFICIENCY vs. LOAD CURRENT 100 12V 70 65 20V 60 ...

Page 11

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator (Circuit of Figure 12V STANDBY AND SHUTDOWN INPUT SUPPLY CURRENT vs. INPUT VOLTAGE 1 STANDBY (ONLDO = 0.1 SHUTDOWN ...

Page 12

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator (Circuit of Figure 12V LDO LOAD TRANSIENT MAX17020 toc16 4μs/div A. LDO OUTPUT, B. LOAD CURRENT, 100mV/div ...

Page 13

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator (Circuit of Figure 12V 3.3V SMPS LOAD TRANSIENT 6.5A 0.5A 3.3V 0A 40μs/div A. LOAD CURRENT, 5A/div B. 3.3V SMPS OUTPUT, 100mV/div ...

Page 14

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator PIN NAME External Reference Input for the Linear Regulator. LDOREFIN sets the LDO regulation voltage ( for a 0. LDOREFIN range. Connect LDOREFIN to GND for a ...

Page 15

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator PIN NAME 26 DH2 High-Side Gate-Driver Output for SMPS2. DH2 swings from LX2 to BST2. 27 ON2 Enable Input for SMPS2. Drive ON2 high to enable SMPS2. Drive ON2 low to ...

Page 16

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator NOTE: PLACE C22 BETWEEN IN AND PGND AS CLOSE AS POSSIBLE TO THE MAX17020 OUTPUT C OUT1 0.1μF 12V TO 15V CHARGE PUMP C8 R4 0.1μF ...

Page 17

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator IN TON SKIP 3.3V LINEAR REGULATOR RTC SECFB ILIM1 OUT1 V DD BST1 DH1 LX1 V DD DL1 PGND FB SELECT (PRESET vs. ADJ) FB1 ON1 PGOOD1 PAD Figure 2. Functional ...

Page 18

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator Table 1. Component Selection for Standard Applications COMPONENT Input Voltage 24V IN Input Capacitor (4x) 10μF, 25V (C ) Taiyo Yuden TMK432BJ106KM IN SMPS 1 Output Capacitor ...

Page 19

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator Detailed Description The MAX17020 step-down controller is ideal for high- voltage, low-power supplies for notebook computers. Maxim’s Quick-PWM pulse-width modulator in the MAX17020 is specifically designed for handling fast load steps ...

Page 20

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator Free-Running Constant-On-Time PWM Controller with Input Feed-Forward The Quick-PWM control architecture is a pseudo-fixed- frequency, constant on-time, current-mode regulator with voltage feed-forward. This architecture relies on the output filter capacitor’s ESR ...

Page 21

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator AGND LX NEG CURRENT VCC CURRENT LIMIT ILIM FB REFIN GND SKIP THREE-LEVEL DECODE Figure 3. Functional Diagram—Quick-PWM Core ______________________________________________________________________________________ INTEGRATOR REF GND AGND LIMIT VALLEY ZERO CROSSING GND ULTRASONIC THRESHOLD ...

Page 22

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator Modes of Operation Forced-PWM Mode ( The low-noise forced-PWM mode (SKIP = V ables the zero-crossing comparator, which controls the low-side ...

Page 23

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator Dynamic Output Voltage—OUT2 Only The MAX17020 regulates OUT2 to the voltage set at REFIN2, so the MAX17020 supports applications that require dynamic output-voltage changes between two set points by adjusting the ...

Page 24

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator When V drops below the UVLO threshold (falling CC edge), the controller stops switching, and DH and DL are pulled low and a 10Ω switch discharges the outputs. When the 2V ...

Page 25

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator logic-level PGOOD_ output voltage, connect an external pullup resistor between PGOOD_ and V pullup resistor works well in most applications. Overvoltage Protection (OVP) When the output voltage rises 16% above the ...

Page 26

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator lower than this grant no further size-reduction bene- fit. The optimum operating point is usually found between 20% and 50% ripple current. When pulse skipping (SKIP low and light loads), the ...

Page 27

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator multiplied by the output capacitor’s ESR. Therefore, the maximum ESR required to meet ripple specifications is: V RIPPLE ≤ R ESR I LOAD MAX ( ) The actual capacitance value required ...

Page 28

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator significantly higher, consider increasing the size of N Conversely, if the losses at V IN(MAX) higher, consider reducing the size of N not vary over a wide range, maximum efficiency is ...

Page 29

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator Also, keep in mind that transient response performance of buck regulators operated too close to dropout is poor, and bulk output capacitance must often be added (see the V equation in ...

Page 30

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator NOTE: PLACE C22 BETWEEN IN AND PGND AS CLOSE AS POSSIBLE TO THE MAX17020. L1 1.2V OUTPUT C OUT1 49.9kΩ 5V SYSTEM SUPPLY C1 1.0μF POWER GROUND ANALOG ...

Page 31

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator PCB Layout Guidelines Careful PCB layout is critical to achieving low switching losses and clean, stable operation. The switching power stage requires particular attention. If possible, mount all the power components ...

Page 32

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator NOTE: PLACE C22 BETWEEN IN AND PGND AS CLOSE AS POSSIBLE TO THE MAX17020. L1 1.5V OUTPUT C OUT1 R1 11.3kΩ R2 10kΩ 5V SYSTEM SUPPLY R10 47Ω C2 1.0μF 3.3V ...

Page 33

Dual Quick-PWM Step-Down Controller with Low-Power LDO, RTC Regulator Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ Package Information For the latest package outline information www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE 32 TQFN T3255-3 DOCUMENT NO. 21-0140 33 ...

Page 34

... 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. 34 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products ...

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