MAX8792 Datasheet PDF - Maxim Integrated Products
| Part Number | MAX8792 | |
| Description | Single Quick-PWM Step-Down Controller | |
| Manufacturers | Maxim Integrated Products | |
| Logo |  |
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19-0739; Rev 0; 1/07
EVAALVUAAILTAIOBNLEKIT
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
General Description
The MAX8792 pulse-width modulation (PWM) controller
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 comput-
ers. The output voltage can be dynamically controlled
using the dynamic REFIN, which supports input volt-
ages between 0 to 2V. The REFIN adjustability com-
bined with a resistive voltage-divider on the feedback
input allows the MAX8792 to be configured for any out-
put voltage between 0 to 0.9 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 MAX8792
to efficiently drive large synchronous-rectifier MOSFETs.
The controller senses the current across the synchro-
nous rectifier to achieve a low-cost and highly efficient
valley current-limit protection. The adjustable current-
limit threshold provides a high degree of flexibility,
allowing thermally compensated protection using an
NTC or foldback current-limit protection using a volt-
age-divider derived from the output.
The MAX8792 includes a voltage-controlled soft-start
and soft-shutdown in order to limit the input surge cur-
rent, provide a monotonic power-up (even into a
precharged output), and provide a predictable power-
www.DautapSthimeeet4.UT.hcoemcontroller also includes output fault protec-
tion—undervoltage and overvoltage protection—as well
as thermal-fault protection.
The MAX8792 is available in a tiny 14-pin, 3mm x 3mm
TDFN package. For space-constrained applications,
refer to the MAX17016 single step-down with 10A, 26V
internal MOSFETs 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 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 Adjustable Valley Current-Limit Protection
Thermal Compensation with NTC
Supports Foldback Current Limit
o Resistively Programmable Switching Frequency
o Overvoltage Protection
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
MAX8792ETD+T 14 TDFN-EP* 3mm x 3mm T1433-1 ADC
Note: This device is specified over the -40°C to +80°C operating
temperature range.
+Denotes a lead-free package.
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX8792
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/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
|
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Single Quick-PWM Step-Down
Controller with Dynamic REFIN
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, VDD = VCC = VEN = 5V, REFIN = ILIM = REF, SKIP = GND. TA = -40°C to +85°C, unless otherwise
specified.) (Note 1)
PARAMETER
Minimum Off-Time
REFIN Voltage Range
FB Voltage Range
FB Voltage Accuracy
REFERENCE
Reference Voltage
FAULT DETECTION
SYMBOL
tOFF(MIN)
VREFIN
VFB
VFB
CONDITIONS
(Note 3)
(Note 2)
(Note 2)
Measured at FB,
VIN = 2V to 26V,
SKIP = VDD
VREFIN = 0.5V
VREFIN = 1.0V
VREFIN = 2.0V
VREF VDD = 4.5V to 5.5V
MIN
0
0
0.49
0.99
1.985
1.985
MAX
350
VREF
VREF
0.51
1.01
2.015
UNITS
ns
V
V
V
2.015
V
Output Overvoltage-Protection
Trip Threshold
OVP
With respect to the internal target voltage
(error comparator threshold) rising edge;
hysteresis = 50mV
250
350 mV
Output Undervoltage-Protection
Trip Threshold
UVP
With respect to the internal target voltage
(error comparator threshold);
falling edge; hysteresis = 50mV
-240
-160
mV
Output Undervoltage
Fault-Propagation Delay
PGOOD Output Low Voltage
VCC Undervoltage Lockout
Threshold
CURRENT LIMIT
www.DatIaLSIMheIentp4Uut.cRoamnge
Current-Limit Threshold
Ultrasonic Frequency
GATE DRIVERS
DH Gate Driver On-Resistance
DL Gate Driver On-Resistance
Internal BST Switch On-Resistance
tUVP FB forced 25mV below trip threshold
ISINK = 3mA
VUVLO(VCC)
Rising edge, PWM disabled below this level,
hysteresis = 100mV
VILIMIT
VILIM = 0.4V
ILIM = REF (2.0V)
SKIP = open (3.3V), VFB = VREFIN + 50mV
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
80
3.95
0.4
17
90
17
400 µs
0.4 V
4.45 V
VREF
23
110
V
mV
kHz
3.5
Ω
3.5
4
Ω
2
7Ω
_______________________________________________________________________________________ 5
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| Information | Total 29 Pages | |
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| Download | [ MAX8792.PDF Datasheet ] | |
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