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PDF MAX8792 Data sheet ( Hoja de datos )

Número de pieza MAX8792
Descripción Single Quick-PWM Step-Down Controller
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! MAX8792 Hoja de datos, Descripción, Manual

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.

1 page




MAX8792 pdf
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

5 Page





MAX8792 arduino
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
Pin Description (continued)
PIN NAME
FUNCTION
Open-Drain Power-Good Output. PGOOD is low when the output voltage is more than 200mV (typ)
14 PGOOD below or 300mV (typ) above the target voltage (VREFIN), during soft-start and soft-shutdown. After the
soft-start circuit has terminated, PGOOD becomes high impedance if the output is in regulation.
PGOOD is blanked—forced high-impedance state—when a dynamic REFIN transition is detected.
EP
GND
Ground/Exposed Pad. Internally connected to the controller’s ground plane and substrate.
(15) Connect directly to ground.
5V BIAS
SUPPLY
AGND
ON OFF
GND/OPEN/REF/VCC
www.DataSheet4U.com
AGND
AGND
LO HI
R3
97.6kΩ
AGND
2 VDD
C1
1μF
C2 PWR
1μF
13 VCC
R10
100kΩ
14 PGOOD
TON 7
BST 6
DH 5
4
LX
3
DL
C3
1000pF
1 EN MAX8792
8
12 SKIP
FB
11 REF
R1
49.9kΩ
R2
54.9kΩ
10 REFIN
9
ILIM
GND (EP)
AGND PWR
RTON
200kΩ
CBST
0.1μF
PWR
NTC
100kΩ
B = 4250
R4
68kΩ
R5
82kΩ
AGND
Figure 1. MAX8792 Standard Application Circuit
INPUT
7V TO 24V
CIN
PWR
L1 OUTPUT
1.05V/1.50V
10A (MAX)
COUT
PWR
REF
SEE TABLE 1 FOR COMPONENT SELECTION.
Standard Application Circuits
The MAX8792 standard application circuit (Figure 1) gen-
erates a 1.5V or 1.05V output rail for general-purpose use
in a notebook computer. See Table 1 for component
selections. Table 2 lists the component manufacturers.
______________________________________________________________________________________ 11

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