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PDF MAX17031 Data sheet ( Hoja de datos )
| Número de pieza | MAX17031 | |
| Descripción | Dual Quick-PWM Step-Down Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4305; Rev 0; 10/08
www.DataSheet4EUV.cAAoLVmUAAILTAIOBNLEKIT
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
General Description
The MAX17031 is a dual Quick-PWM™ step-down
power-supply (SMPS) controller with synchronous recti-
fication, 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 valley current-limit protection. Combined with
the output overvoltage and undervoltage protection fea-
tures, this current limit ensures robust output supplies.
The 5V/3.3V SMPS outputs can save power by operat-
ing in pulse-skipping mode or in ultrasonic mode to
avoid audible noise. Ultrasonic mode forces the con-
troller to maintain switching frequencies greater than
20kHz at light loads. The SKIP input also has an accu-
rate logic threshold, allowing it to be used as a sec-
ondary feedback input to refresh an external charge
pump or secondary winding without overcharging the
output voltages.
An internal 100mA linear regulator generates the 5V
bias needed for power-up or other low-power “always-
on” suspend supplies. An internal bypass circuitry
allows automatic bypassing of the linear regulator when
the 5V SMPS is active.
The device includes independent shutdown controls
with well-defined logic thresholds 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 peri-
od. 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. A
combined power-good (PGOOD) output simplifies the
interface with external controllers. The MAX17031 is
available in a 24-pin thin QFN (4mm x 4mm) package.
Applications
Notebook Computers
Ultra-Mobile PC
Main System Supply (5V and 3.3V Supplies)
2 to 4 Li+ Cells Battery-Powered Devices
Telecommunication
Features
o Dual Quick-PWM
o Preset 5V and 3.3V Outputs
o Internal 100mA, 5V Linear Regulator
o Internal OUT1 LDO5 Bypass Switch
o Secondary Feedback (SKIP Input) Maintains
Charge Pump
o 3.3V, 5mA Real-Time Clock (RTC) Power (Always
On)
o 2V ±1% 50µA Reference
o 6V to 24V Input Range
o Pulse-Skipping/Forced-PWM/Ultrasonic Mode
Control
o Independent SMPS and LDO5 Enable Controls
o Combined SMPS PGOOD Outputs
o Minimal Component Count
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX17031ETG+
-40°C to +85°C
24 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
TOP VIEW
18 17 16 15 14 13
LX2 19
12 LX1
DH2 20
11 DH1
ON2 21
SKIP 22
MAX17031
10 ON1
9 PGOOD
OUT2 23
ILIM2 24
+
*EP 8 ILIM1
7 OUT1
12 3 4 56
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
*EXPOSED PAD.
THIN QFN
4mm × 4mm
________________________________________________________________ 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 and RTC Regulator for MAIN Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN = 12V, VDD = VCC = VSKIP = 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
INPUTS AND OUTPUTS
SKIP Input Thresholds
Upper SKIP/PWM threshold falling edge,
33mV hysteresis
1.94 2.0 2.06
V
SKIP Leakage Current
ON_ Input-Logic Levels
Lower PWM/ultrasonic threshold
VSKIP = 0 or 5V, TA = +25°C
High (SMPS on)
ONLDO, ON1, ON2
Low (SMPS off)
0.4
-1
2.4
1.6
+1 µA
V
0.8
ON_ Leakage Current
OUT_ Leakage Current
VON1 = VON2 = VONLDO = 0 or 5V,
TA = +25°C
VON1 = VON2 = VCC VOUT1 = 5.3V
VOUT2 = 3.5V
-2
15
5
+2 µA
65
µA
30
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN = 12V, VDD = VCC = VSKIP = 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
INPUT SUPPLIES
IN Input Voltage Range
IN Standby Supply Current
IN Shutdown Supply Current
IN Supply Current
VCC Bias Supply Current
PWM CONTROLLERS
OUT1 Output-Voltage Accuracy
OUT2 Output-Voltage Accuracy
DH1 On-Time
DH2 On-Time
Minimum Off-Time
Ultrasonic Operating Frequency
SYMBOL
CONDITIONS
IIN
IVCC
LDO5 in regulation
VIN = 6V to 24V, ON1 = ON2 = GND,
ONLDO = RTC
VIN = 4.5V to 24V,
ON1 = ON2 = ONLDO = GND
ON1 = ON2 = VCC, VSKIP = VCC,
VOUT1 = 5.3V, VOUT2 = 3.5V
ON1 = ON2 = VCC, VSKIP = VCC,
VOUT1 = 5.3V, VOUT2 = 3.5V
VOUT1 VSKIP = 1.8V
VOUT2 VSKIP = 1.8V
tON1
VOUT1 = 5.0V (Note 1)
tON2
VOUT2 = 3.3V (Note 1)
tOFF(MIN) (Note 1)
fSW(USONIC) VSKIP = GND
MIN TYP MAX UNITS
6 24 V
200 µA
70 µA
0.2 mA
1.5 mA
4.90
3.234
895
833
18
5.10
3.366
1209
1017
400
V
V
ns
ns
ns
kHz
_______________________________________________________________________________________ 5
5 Page 
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Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
Pin Description (continued)
PIN NAME
FUNCTION
Open-Drain Power-Good Output for SMPS1 and SMPS2. PGOOD is low when either output voltage is
9 PGOOD more than 15% (typ) below the nominal regulation threshold, during soft-start, in shutdown, when
either SMPS is disabled, and after the fault latch has been tripped. After the soft-start circuit has
terminated, PGOOD becomes high impedance if both outputs are in regulation.
10
ON1
Enable Input for SMPS1. Drive ON1 high to enable SMPS1. Drive ON1 low to shut down SMPS1.
11
DH1
High-Side Gate-Driver Output for SMPS1. DH1 swings from LX1 to BST1.
12
LX1
Inductor Connection for SMPS1. Connect LX1 to the switched side of the inductor. LX1 is the lower
supply rail for the DH1 high-side gate driver.
13
BST1
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor as shown in
Figure 1. An optional resistor in series with BST1 allows the DH1 turn-on current to be adjusted.
14 DL1 Low-Side Gate-Driver Output for SMPS1. DL1 swings from power GND to VDD.
Supply Voltage Input for the DL_ Gate Drivers. VDD is internally connected to the drain of the HVPV
15 VDD BST diode switch. Connect to a 5V supply, and bypass VDD to power GND with a 1µF or greater
ceramic capacitor.
16
GND
Analog and Power Ground
17 DL2 Low-Side Gate-Driver Output for SMPS2. DL2 swings from power GND to VDD.
18
BST2
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor as shown in
Figure 1. An optional resistor in series with BST2 allows the DH2 turn-on current to be adjusted.
19
LX2
Inductor Connection for SMPS2. Connect LX2 to the switched side of the inductor. LX2 is the lower
supply rail for the DH2 high-side gate driver.
20
DH2
High-Side Gate-Driver Output for SMPS2. DH2 swings from LX2 to BST2.
21
ON2
Enable Input for SMPS2. Drive ON2 high to enable SMPS2. Drive ON2 low to shut down SMPS2.
Pulse-Skipping Control Input. This three-level input determines the operating mode for the
switching regulators:
22
SKIP
High (> 2V) = pulse-skipping mode
Middle (1.8V) = forced-PWM mode
GND = ultrasonic mode
23
OUT2
Output-Voltage Sense Input for SMPS2. OUT2 is an input to the Quick-PWM on-time one-shot timer.
OUT2 also serves as the feedback input for the preset 3.3V.
Valley Current-Limit Adjustment for SMPS2. The GND - LX2 current-limit threshold is 1/10 the
24 ILIM2 voltage present on ILIM2 over a 0.2V to 2V range. An internal 5µA current source allows this
voltage to be set with a single resistor between ILIM2 and analog ground.
— EP Exposed Pad. Connect backside exposed pad to analog GND and power GND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX17031.PDF ] | |
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