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PDF MAX17024 Data sheet ( Hoja de datos )
| Número de pieza | MAX17024 | |
| Descripción | Single Quick-PWM Step-Down Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1040; Rev 0; 10/07
EVAALVUAAILTAIOBNLEKIT
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
General Description
The MAX17024 pulse-width modulation (PWM) con-
troller provides high efficiency, excellent transient
response, and high DC-output accuracy needed for
stepping down high-voltage batteries to generate low-
voltage core or chipset/RAM bias supplies in notebook
computers. The output voltage can be controlled using
the dynamic REFIN, which supports input voltages
between 0 to 2V. The REFIN adjustability combined
with a resistive voltage-divider on the feedback input
allows the MAX17024 to be configured for any output
voltage between 0 to 0.9 x VIN.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant-on-time PWM control scheme handles wide
input/output voltage ratios (low-duty-cycle applications)
with ease and provides 100ns “instant-on” response to
load transients while maintaining a relatively constant
switching frequency. Strong drivers allow the MAX17024
to efficiently drive large synchronous-rectifier MOSFETs.
The controller senses the current across the sense
resistor series with the synchronous rectifier to achieve
highly accurate valley current-limit protection.
The MAX17024 includes a voltage-controlled soft-start
and soft-shutdown to limit the input surge current, pro-
vide a monotonic power-up (even into a precharged
output), and provide a predictable power-up time. The
controller also includes output undervoltage and ther-
mal-fault protection.
The MAX17024 is available in a tiny 14-pin, 3mm x
3mm TDFN package. For space-constrained applica-
tions, refer to the MAX17016 single step-down with 26V
internal MOSFETs capable of supporting 10A continu-
ous load. The MAX17016 is available in a small 40-pin,
6mm x 6mm TQFN package.
Applications
Notebook Computers
I/O and Chipset Supplies
GPU Core Supply
DDR Memory—VDDQ or VTT
Point-of-Load Applications
Step-Down Power Supply
Features
o Quick-PWM with Fast Transient Response
o Supports Any Output Capacitor
No Compensation Required with
Polymers/Tantalum
Stable with Ceramic Output Capacitors Using
External Compensation
o Precision 2V ±10mV Reference
o Dynamically Adjustable Output Voltage
(0 to 0.9 x VIN Range)
Feedback Input Regulates to 0 to 2V REFIN
Voltage
0.5% VOUT Accuracy Over Line and Load
o 26V Maximum Input Voltage Rating
o Resistively Programmable Switching Frequency
o Undervoltage/Thermal Protection
o Voltage Soft-Start and Soft-Shutdown
o Monotonic Power-Up with Precharged Output
o Power-Good Window Comparator
Ordering Information
PART
PIN-PACKAGE
PKG TOP
CODE MARK
MAX17024ETD 14 TDFN-EP* 3mm x 3mm T1433-1 ADO
Note: This device is specified over the -40°C to +85°C operating
temperature range.
+Denotes a lead-free package.
*EP = Exposed paddle.
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX17024
GND
1234567
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
TDFN
(3mm x 3mm)
________________________________________________________________ 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  
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, VDD = VCC = VEN = 5V, REFIN = REF. TA = -40°C to +85°C, unless otherwise specified.) (Note 1)
PARAMETER
REFERENCE
Reference Voltage
FAULT DETECTION
SYMBOL
CONDITIONS
VREF VDD = 4.5V to 5.5V
MIN
1.985
MAX UNITS
2.015
V
Upper PGOOD Trip Threshold
With respect to the internal target voltage
VPGOOD_H (error comparator threshold) rising edge;
hysteresis = 50mV
250
350 mV
Lower PGOOD Trip Threshold
With respect to the internal target voltage
VPGOOD_L (error comparator threshold)
falling edge; hysteresis = 50mV
-240
-160
mV
Output Undervoltage
Fault-Propagation Delay
tUVP
FB forced 25mV below VPGOOD_L
trip threshold
80
400 µs
PGOOD Output Low Voltage
ISINK = 3mA
0.4 V
VCC Undervoltage Lockout
Threshold
VUVLO(VCC)
Rising edge, PWM disabled below this level,
hysteresis = 100mV
3.95
4.45
V
CURRENT LIMIT
Current-Limit Threshold
GATE DRIVERS
DH Gate Driver On-Resistance
DL Gate Driver On-Resistance
Internal BST Switch On-Resistance
INPUTS AND OUTPUTS
VCS
RON(DH)
RON(DL)
RBST
BST - LX forced Low state (pulldown)
to 5V
High state (pullup)
High state (pullup)
Low state (pulldown)
IBST = 10mA, VDD = 5V
17
23 mV
3.5
3.5
4
2
7
EN Logic-Input Threshold
VEN EN rising edge hysteresis = 450mV (typ)
1.20
2.20
V
Note 1: Limits are 100% production tested at TA = +25°C. Maximum and minimum limits over temperature are guaranteed by
design and characterization.
Note 2: The 0 to 0.5V range is guaranteed by design, not production tested.
Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, VBST = 5V,
and a 250pF capacitor connected from DH to LX. Actual in-circuit times can differ due to MOSFET switching speeds.
_______________________________________________________________________________________ 5
5 Page 
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
+5V Bias Supply (VCC/VDD)
The MAX17024 requires an external 5V bias supply in
addition to the battery. Typically, this 5V bias supply is
the notebook’s main 95% efficient 5V system supply.
Keeping the bias supply external to the IC improves
efficiency and eliminates the cost associated with the
5V linear regulator that would otherwise be needed to
supply the PWM circuit and gate drivers. If stand-alone
capability is needed, the 5V supply can be generated
with an external linear regulator, such as the MAX1615.
The 5V bias supply powers both the PWM controller
and internal gate drive, so the maximum current drawn
is determined by:
IBIAS = IQ + fSWQG = 2mA to 20mA (typ)
The MAX17024 includes a 20Ω resistor between VDD
and VCC, simplifying the PCB layout request.
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 (Figure 2). This architecture
relies on the output filter capacitor’s ESR to act as a cur-
rent-sense resistor, so the output ripple voltage provides
the PWM ramp signal. The control algorithm is simple:
the high-side switch on-time is determined solely by a
TON
ON-TIME
IN
COMPUTE
OUT
tON
TRIG
ONE-SHOT
Q
ERROR
AMPLIFIER
INTEGRATOR
(CCV)
FB
EA + 0.3V
PGOOD
AND FAULT
PROTECTION
tOFF(MIN)
Q TRIG
ONE-SHOT
SQ
R
S
Q
R
ZERO CROSSING
VALLEY CURRENT LIMIT
EA - 0.2V
EN
PGOOD
SOFT-
START/STOP
EA
2V
REF
BST
DH
LX
VDD
DL
GND
CS
REF
VCC
REFIN
MAX17024
BLANK
DYNAMIC OUTPUT
TRANSITION DETECTION
Figure 2. MAX17024 Functional Block Diagram
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX17024.PDF ] | |
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