|
|
PDF MAX17101 Data sheet ( Hoja de datos )
| Número de pieza | MAX17101 | |
| Descripción | Step-Down Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX17101 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
19-4243; Rev 1; 2/09
www.DataSheet4EUV.cAAoLVmUAAILTAIOBNLEKIT
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
General Description
The MAX17101 is a dual Quick-PWM™ step-down
power-supply (SMPS) controller with synchronous rectifi-
cation, intended for main 5V/3.3V power generation in
battery-powered systems. Low-side MOSFET sensing
provides a simple low-cost, highly efficient current sense
for providing valley current-limit protection. Combined
with the output overvoltage and undervoltage protection
features, this current limit ensures robust output supplies.
The 5V/3.3V SMPS outputs can save power by operating
in pulse-skipping mode or in ultrasonic 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 MAX17101 comes in a lead-free 32-pin TQFN
(5mm x 5mm) package and operates in the -40°C to
+85°C temperature range.
Applications
Notebook Computers
Main System Supply (5V and 3.3V Supplies)
Graphic Cards
DDR1, DDR2, DDR3 Power Supplies
Game Consoles
Low-Power I/O and Chipset Supplies
Two to Four Li+ Cells Battery-Powered Devices
PDAs and Mobile Communicators
Telecommunication
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
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 0 to 2V REFIN2 Input on Second Output
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
MAX17101ETJ+ -40°C to +85°C
32 Thin QFN-EP*
+Denotes a lead-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
MAX17101
13 PGOOD1
12 ILIM1
OUT2 30
11 FB1
ILIM2 31
+REFIN2 32
10 OUT1
9 BYP
1 2345678
THIN QFN
A "+" SIGN FIRST-PIN INDICATOR DENOTES A LEAD-FREE PACKAGE.
________________________________________________________________ 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  
www.DataSheet4U.com
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 =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
OUT2 FAULT DETECTION
OUT2 Overvoltage Trip
Threshold
OUT2 Overvoltage
Fault-Propagation Delay
SYMBOL
CONDITIONS
With respect to error-comparator threshold
VOVP(OUT2)
Minimum overvoltage threshold
tOVP OUT2 forced 50mV above trip threshold
MIN TYP MAX UNITS
12 16 20
0.7
%
V
10 μs
OUT2 Undervoltage Protection
Trip Threshold
VUVP(OUT2) With respect to error-comparator threshold
65 70 75 %
OUT2 Overvoltage
Fault-Propagation Delay
OUT2 Output Undervoltage
Fault-Propagation Delay
PGOOD2 Lower Trip Threshold
PGOOD2 Propagation Delay
PGOOD2 Output-Low Voltage
PGOOD2 Leakage Current
CURRENT LIMIT
ILIM_ Adjustment Range
ILIM_ Current
Valley Current-Limit Threshold
(Adjustable)
Current-Limit Threshold
(Negative)
Ultrasonic Current-Limit
Threshold
Current-Limit Threshold
(Zero Crossing)
tOVP OUT2 forced 50mV above trip threshold
tUVP OUT2 forced 50mV below trip threshold
tPGOOD2
IPGOOD2
With respect to error-comparator threshold,
falling edge, hysteresis = 2%
OUT2 forced 50mV beyond PGOOD1 trip
threshold, falling edge
VOUT2 = VREFIN2 - 150mV (PGOOD2 low
impedance), ISINK = 4mA
OUT2 = REFIN2 (PGOOD2 high impedance),
PGOOD2 forced to 5.5V, TA = +25°C
-20
VILIM
IILIM
VVALLEY
VNEG
VAGND - VLX_
RILIM_ = 100k
RILIM_ = 200k
With respect to valley current-limit threshold,
SKIP = VCC
VNEG(US) VOUT1 = VOUT2 = VFB1 = 0.77V, VREFIN2 = 0.70V
0.2
40
87
VZX VAGND - VLX_, SKIP = GND or OPEN/REF
10
10
-16
10
5
50
100
-120
25
1
-12
0.3
1
2.0
60
113
μs
μs
%
μs
V
μA
V
μA
mV
%
mV
mV
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
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
LDO AND RTC POWER-UP
MAX17101 toc11
LDO AND RTC POWER REMOVAL
MAX17101 toc12
12V
A
12V
12V
A
B 12V
5V
5V
0V
0V C
3.3V 3.3V
D
B
5V
0V
2.0V
2V
C
3.3V
0V
D
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
5V LDO LOAD TRANSIENT
MAX17101 toc13
5V SMPS STARTUP AND SHUTDOWN
MAX17101 toc14
A
5V 5V
5V A
5V
0.1A
0A B
A. LDO OUTPUT,
100mV/div
4μs/div
B. LOAD CURRENT,
100mA/div
0V
5V
0V
200μs/div
A. 5V LDO OUTPUT, 0.2V/div
B. 5V SMPS OUTPUT, 2V/div
C. ON1, 5V/div
B
5V
C
STARTUP WAVEFORMS
(SWITCHING REGULATORS)
MAX17101 toc15
5V A
0V
B
5V 5V
5V
0V
C
0V
0A D
100μs/div
A. ON1, 2V/div
C. PGOOD1, 5V/div
B. 5V SMPS OUTPUT, D. INDUCTOR CURRENT,
2V/div
5A/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX17101.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX1710 | High-Speed / Digitally Adjusted Step-Down Controllers for Notebook CPUs |  Maxim Integrated |
| MAX17101 | Step-Down Controller | Maxim Integrated Products |
| MAX17105 | 8-String WLED Driver | Maxim Integrated |
| MAX17108 | 10-Channel High-Voltage Scan Driver and VCOM Amplifier | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |