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PDF MAX17020 Data sheet ( Hoja de datos )
| Número de pieza | MAX17020 | |
| Descripción | Dual Quick-PWM Step-Down Controller | |
| Fabricantes | Maxim Integrated Products | |
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19-4118; Rev 2; 2/09
EVAALVUAAILTAIOBNLEKIT
Dual Quick-PWM Step-Down Controller
with Low-Power LDO, RTC Regulator
General Description
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
www.DaobtaveSelohrewaetg41Urmo.cusonmpderiniods.huTtodopwrenv,etnhtethineteoruntapluvtoflrtoamgeritnagrginegt
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.
Applications
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
Features
o Dual Quick-PWM
o Internal 100mA 5V or Adjustable Linear Regulator
o Independent LDO Bypass Input
o Internal Boost Diodes
o Secondary Feedback Input Maintains Charge Pump
o 3.3V 5mA RTC Power (Always On)
o OUT1: 5V or 1.5V Fixed or 0.7V Adjustable
Feedback
o OUT2: 3.3V or 1.05V Fixed or Dynamic Adjustable
o Dynamic 0V to 2V REFIN2 Input on Second SMPS
o 2V ±1% 50µA Reference
o 6V to 24V Input Range (28V max)
o Ultrasonic Mode
o Independent SMPS and LDO Enable Controls
o Independent SMPS Power-Good Outputs
o Minimal Component Count
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX17020ETJ+
-40°C to +85°C
32 TQFN
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
24 23 22 21 20 19 18 17
LX2 25
16 LX1
DH2 26
15 DH1
ON2 27
14 ON1
PGOOD2 28
SKIP 29
MAX17020
13 PGOOD1
12 ILIM1
OUT2 30
11 FB1
ILIM2 31
+REFIN2 32
10 OUT1
9 BYP
1 2345678
THIN QFN (T3255-4)
5mm x 5mm
A "+" SIGN FIRST-PIN INDICATOR DENOTES A LEAD-FREE PACKAGE.
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.
1 page  
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, VIN = 12V, VDD = VCC = VSECFB = 5V, VREFIN2 = 1.0V, BYP =
LDOREFIN = GND, ONLDO = IN, ON1 = ON2 = VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Note 3)
PARAMETER
OUT2 FAULT DETECTION
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
OUT2 Overvoltage Trip
Threshold
Preset mode (REFIN2 = RTC or VCC): with
respect to error-comparator threshold
VOVP(OUT2)
Dynamic transition,
SKIP = REF or VCC and OUT2 > REFIN2
Tracking mode: with respect to REFIN2 voltage
Minimum overvoltage threshold
13 16 19
VREF +
0.20
170 200 230
0.7
%
V
mV
V
OUT2 Overvoltage
Fault-Propagation Delay
tOVP OUT2 forced 50mV above trip threshold
OUT2 Undervoltage-Protection
Trip Threshold
Preset mode: with respect to
VUVP(OUT2) error-comparator threshold
Tracking mode: with respect to REFIN2 voltage
OUT2 Overvoltage
Fault-Propagation Delay
tOVP OUT2 forced 50mV above trip threshold
OUT2 Output Undervoltage
Fault-Propagation Delay
tUVP OUT2 forced 50mV below trip threshold
Dynamic REFIN2 Transition
PGOOD Blanking Threshold
Blanking initiated; REFIN2 deviation from the
internal target voltage (error-comparator
threshold); hysteresis = 5mV
PGOOD2 Lower Trip Threshold
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PGOOD2 Propagation Delay
tPGOOD2
Preset mode: with respect to error-comparator
threshold, falling edge, hysteresis = 1%
Tracking mode: with respect to REFIN2
voltage, falling edge, hysteresis = 12mV
OUT2 forced 50mV beyond PGOOD1 trip
threshold, falling edge
PGOOD2 Output-Low Voltage
PGOOD2 Leakage Current
CURRENT LIMIT
IPGOOD2
VOUT2 = VREFIN2 - 150mV (PGOOD2 low
impedance), ISINK = 4mA
OUT2 = REFIN2 (PGOOD2 high impedance),
PGOOD2 forced to 5.5V, TA = +25°C
ILIM_ Adjustment Range
ILIM_ Current
Valley Current-Limit Threshold
(Adjustable)
Current-Limit Threshold
(Negative)
Ultrasonic Current-Limit Threshold
Current-Limit Threshold
(Zero Crossing)
VILIM
IILIM
VVALLEY
VNEG
VNEG(US)
VZX
RILIM_ = 100k
VAGND - VLX_
RILIM_ = 200k
RILIM_ = 400k
With respect to valley current-limit threshold,
SKIP = VCC
VOUT1 = VOUT2 = VFB1 = 0.77V, VREFIN2 = 0.70V
VAGND - VLX_, SKIP = GND or OPEN/REF
65
-250
-19
-175
0.2
44
90
180
10
70
-300
10
10
±25
-16
-150
10
5
50
100
200
-120
25
3
75
-350
-13
-125
0.3
1
2.0
56
110
220
µs
%
mV
µs
µs
mV
%
mV
µs
V
µA
V
µA
mV
%
mV
mV
_______________________________________________________________________________________ 5
5 Page 
Dual Quick-PWM Step-Down Controller
with Low-Power LDO, RTC Regulator
Typical Operating Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VDD = VCC = 5V, TON = REF, TA = +25°C, unless otherwise noted.)
STANDBY AND SHUTDOWN INPUT
SUPPLY CURRENT vs. INPUT VOLTAGE
1
STANDBY (ONLDO = VIN)
0.1
0.01
0
SHUTDOWN
(ONLDO = ON1 = ON2 = GND)
5 10 15 20
INPUT VOLTAGE (V)
25
REFERENCE OFFSET
VOLTAGE DISTRIBUTION
70
+85°C
SAMPLE SIZE = 150
60 +25°C
50
40
30
20
10
0
-20
-12 -4 4 12
2V REF OFFSET VOLTAGE (mV)
20
REFIN2 OFFSET
VOLTAGE DISTRIBUTION
70
+85°C
SAMPLE SIZE = 150
60 +25°C
50
40
30
20
10
0
-5
-3 -1
1
3
REFIN2 OFFSET VOLTAGE (mV)
5
100mV ILIM THRESHOLD
VOLTAGE DISTRIBUTION
50
+85°C
SAMPLE SIZE = 150
40 +25°C
30
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10
0
90
94 98 102 106
ILIM THRESHOLD VOLTAGE (mV)
110
LDO AND RTC POWER-UP
MAX17020 toc14
LDO AND RTC POWER REMOVAL
MAX17020 toc15
12V A 12V
12V A
B 12V
5V
5V
0V
0V C
3.3V 3.3V
B
5V
D
0V
2.0V
2V
C
3.3V
D
0V 2.0V
200μs/div
A. INPUT SUPPLY, 5V/div C. 3.3V RTC, 2V/div
B. 5V LDO, 2V/div
D. 2.0V REF, 1V/div
200μs/div
A. INPUT SUPPLY, 5V/div C. 3.3V RTC, 2V/div
B. 5V LDO, 2V/div
D. 2.0V REF, 1V/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX17020.PDF ] | |
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