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MAX8792ETD+T

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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 0.9V
IN
.
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-
up time. The controller 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 0.9V
IN
Range)
Feedback Input Regulates to 0 to 2V REFIN
Voltage
0.5% V
OUT
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
MAX8792
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
________________________________________________________________
Maxim Integrated Products
1
MAX8792
GND
TDFN
(3mm x 3mm)
TOP VIEW
245
13 11 10
V
CC
REF
REFIN
V
DD
LX
DH
1
14
PGOODEN
3
12
DL
6
9
ILIMBST
7
8
FBTON
SKIP
Pin Configuration
Ordering Information
19-0739; Rev 1; 2/10
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.
Note: This device is specified over the -40°C to +85°C operating
temperature range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
EVALUATION KIT
AVAILABLE
PART PIN-PACKAGE
PKG
CODE
TOP
MARK
MAX8792ETD+T
14 TD FN - E P * 3m m x 3m m T1433-1
ADC
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
MAX8792
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= V
EN
= 5V, REFIN = ILIM = REF, SKIP = GND. T
A
= 0°C to +85°C, unless otherwise spec-
ified. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
TON to GND ...........................................................-0.3V to +28V
V
DD
to GND..............................................................-0.3V to +6V
V
CC
to GND................................................-0.3V to (V
DD
+ 0.3V)
EN, SKIP, PGOOD to GND.......................................-0.3V to +6V
REF, REFIN to GND....................................-0.3V to (V
CC
+ 0.3V)
ILIM, FB to GND .........................................-0.3V to (V
CC
+ 0.3V)
DL to GND..................................................-0.3V to (V
DD
+ 0.3V)
BST to GND.................................................(V
DD
- 0.3V) to +34V
BST to LX..................................................................-0.3V to +6V
BST to V
DD
.............................................................-0.3V to +28V
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
14-Pin 3mm x 3mm TDFN
(derated 24.4mW/°C above +70°C)....................1951mW
Operating Temperature Range (extended).........-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+240°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWM CONTROLLER
Input Voltage Range V
IN
226V
Quiescent Supply Current (V
DD
)I
DD
+ I
CC
FB forced above REFIN 0.7 1.2 mA
Shutdown Supply Current (V
DD
)I
SHDN
EN = GND, T
A
= +25°C 0.1 2 μA
V
DD
-to-V
CC
Resistance R
CC
20 Ω
R
TON
= 97.5kΩ (600kHz) 118 139 160
R
TON
= 200kΩ (300kHz) 250 278 306On-Time t
ON
V
IN
= 12V,
V
FB
= 1.0V
(Note 3)
R
TON
= 302.5kΩ (200kHz) 354 417 480
ns
Minimum Off-Time t
OFF
(
MIN
)
(Note 3) 200 300 ns
TON Shutdown Supply Current
EN = GND, V
TON
= 26V,
V
CC
= 0V or 5V, T
A
= +25°C
0.01 1 μA
REFIN Voltage Range V
REFIN
(Note 2) 0 V
REF
V
FB Voltage Range V
FB
(Note 2) 0 V
REF
V
T
A
= +25°C 0.495 0.5 0.505
V
REFIN
= 0.5V,
m easur ed at FB,
V
I N
= 2V to 26V ,
SKIP = V
DD
T
A
= 0°C to +85°C 0.493 0.507
T
A
= +25°C 0.995 1.0 1.005
V
REFIN
= 1.0V
T
A
= 0°C to +85°C 0.993 1.007
FB Voltage Accuracy V
FB
V
REFIN
= 2.0V T
A
= 0°C to +85°C 1.990 2.0 2.010
V
FB Input Bias Current I
FB
V
FB
= 0.5V to 2.0V, T
A
= +25°C -0.1 +0.1 μA
Load-Regulation Error I
LOAD
= 0 to 3A, SKIP = V
DD
0.1 %
Line-Regulation Error V
CC
= 4.5V to 5.5V, V
IN
= 4.5V to 26V 0.25 %
Soft-Start/-Stop Slew Rate t
SS
Rising/falling edge on EN 1 mV/μs
Dynamic REFIN Slew Rate t
DYN
Rising edge on REFIN 8 mV/μs
REFERENCE
No load 1.990 2.00 2.010
Reference Voltage V
REF
V
CC
= 4.5V
to 5.5V
I
REF
= -10μA to +50μA 1.98 2.02
V
MAX8792
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FAULT DETECTION
With respect to the internal target voltage
(error comparator threshold); rising edge;
hysteresis = 50mV
250 300 350 mV
Dynamic transition
V
REF
+
0.30
Output Overvoltage-Protection
Trip Threshold
OVP
Minimum OVP threshold 0.7
V
Output Overvoltage
Fault-Propagation Delay
t
OVP
FB forced 25mV above trip threshold 5 μs
Output Undervoltage-Protection
Trip Threshold
UVP
With respect to the internal target voltage
(error comparator threshold); falling edge;
hysteresis = 50mV
-240 -200 -160 mV
Output Undervoltage
Fault-Propagation Delay
t
UVP
FB forced 25mV below trip threshold 100 200 350 μs
UVP falling edge, 25mV overdrive 5
OVP rising edge, 25mV overdrive 5
PGOOD Propagation Delay t
PGOOD
Startup delay 100 200 350
μs
PGOOD Output-Low Voltage I
SINK
= 3mA 0.4 V
PGOOD Leakage Current I
PGOOD
FB = REFIN (PGOOD high impedance),
PGOOD forced to 5V, T
A
= +25°C
1μA
Dynamic REFIN Transition Fault
Blanking Threshold
Fault blanking initiated; REFIN deviation
from the internal target voltage (error
comparator threshold); hysteresis = 10mV
±50 mV
Thermal-Shutdown Threshold T
SHDN
Hysteresis = 15°C 160 °C
V
CC
Undervoltage Lockout
Threshold
V
U V LO
(
V C C
)
Rising edge, PWM disabled below this
level; hysteresis = 100mV
3.95 4.2 4.45 V
CURRENT LIMIT
ILIM Input Range 0.4 V
REF
V
V
ILIM
= 0.4V 18 20 22
Current-Limit Threshold V
ILIMIT
ILIM = REF (2.0V) 92 100 108
mV
Current-Limit Threshold
(Negative)
V
INEG
V
ILIM
= 0.4V -24 mV
Current-Limit Threshold
(Zero Crossing)
V
ZX
V
ILIM
= 0.4V,
V
GND
- V
LX
, SKIP = GND or open
1mV
Ultrasonic Frequency SKIP = open (3.3V); V
FB
= V
REFIN
+ 50mV 18 30 kHz
U l tr asoni c C ur r ent- Li m i t Thr eshol d SKIP = open (3.3V); V
FB
= V
REFIN
+ 50mV 35 mV
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= V
EN
= 5V, REFIN = ILIM = REF, SKIP = GND. T
A
= 0°C to +85°C, unless otherwise spec-
ified. Typical values are at T
A
= +25°C.) (Note 1)
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MAX8792ETD+T

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Manufacturer:
Maxim Integrated
Description:
Switching Controllers Single Quick-PWM Step-Down Controller
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