(PDF) MAX783 Datasheet PDF | Maxim





MAX783 Datasheet PDF

Part Number MAX783
Description Triple-Output Power-Supply Controller for Notebook Computers
Manufacture Maxim
Total Page 28 Pages
PDF Download Download MAX783 Datasheet PDF

Features: Datasheet pdf 19-0045; Rev 1; 5/94 In it d nK atio n clude u l a I Ev tion a form Triple-Ou tput Power-Supply Controller for Notebo ok Computers __________________________ __Features o o o o o o o Dual PWM Buck Controllers (+3.3V and +5V) Dual PCMCIA VPP Outputs (0V/3.3V/5V/12V) Two Preci sion Comparators or Level Translators P ower-Ready Status Output (RDY5) 95% Eff iciency Optimized for 6-Cell Applicatio ns 420µA Quiescent Current; 70µA in S tandby (linear regulators alive) 25µA Shutdown Current o 5.5V to 30V Input Ra nge o Small SSOP Package o Fixed Output Voltages Available: 3.3V (standard) 3. 45V (High-Speed Pentium™) 3.6V (Power PC™) _______________General Descript ion The MAX783 is a system-engineered p ower-supply controller for notebook com puters or similar battery-powered equip ment. It provides two high-performance step-down (buck) pulsewidth modulators (PWMs) for +3.3V/+5V and dual PCMCIA VP P outputs powered by an integral flybac k winding controller. Other functions include dual, low-dropout, micro.

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MAX783 datasheet
19-0045; Rev 1; 5/94
Triple-OutputInfEorvmalautaiotinonInKcliut ded Power-Supply Controller
for Notebook Computers
_______________General Description
The MAX783 is a system-engineered power-supply controller
for notebook computers or similar battery-powered equipment.
It provides two high-performance step-down (buck) pulse-
width modulators (PWMs) for +3.3V/+5V and dual PCMCIA
VPP outputs powered by an integral flyback winding controller.
Other functions include dual, low-dropout, micropower linear
regulators for CMOS/RTC back up, and two precision low-
battery-detection comparators.
High efficiency (95% at 2A, greater than 80% at loads from
5mA to 3A) is achieved through synchronous rectification
and PWM operation at heavy loads, and Idle-ModeTM oper-
ation at light loads. The MAX783 uses physically small
components, thanks to high operating frequencies
(300kHz/200kHz) and a new current-mode PWM architec-
ture that allows for output filter capacitors as small as 30µF
per ampere of load. Line- and load-transient responses
are terrific, with a high 60kHz unity-gain crossover frequen-
cy that allows output transients to be corrected within four
or five clock cycles. Low system cost is achieved through
a high level of integration and the use of low-cost external
N-channel MOSFETs. The integral flyback winding con-
troller provides a low-cost, +15V high-side output that regu-
lates even in the absence of a load on the main output.
____________________________Features
o Dual PWM Buck Controllers (+3.3V and +5V)
o Dual PCMCIA VPP Outputs (0V/3.3V/5V/12V)
o Two Precision Comparators or Level Translators
o Power-Ready Status Output (RDY5)
o 95% Efficiency
o Optimized for 6-Cell Applications
o 420µA Quiescent Current;
70µA in Standby (linear regulators alive)
25µA Shutdown Current
o 5.5V to 30V Input Range
o Small SSOP Package
o Fixed Output Voltages Available:
3.3V (standard)
3.45V (High-Speed Pentium)
3.6V (PowerPC)
______________Ordering Information
PART
MAX783CBX
MAX783RCBX
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
36 SSOP
36 SSOP
VOUT
3.3V
3.45V
Ordering Information continued on last page.
Other features include low-noise, fixed-frequency PWM
operation at moderate to heavy loads and a synchronizable
oscillator for noise-sensitive applications such as electro-
magnetic pen-based systems and communicating comput-
ers. The MAX783 is similar to the MAX782, except the fly-
back winding is on the 3.3V inductor instead of the 5V
inductor, the VPP outputs can be optionally programmed to
3.3V, and the device may be completely shut down.
________________________Applications
Notebook Computers
Portable Data Terminals
Communicating Computers
Pen-Entry Systems
__________________Pin Configuration
TOP VIEW
ON3 1
SHDN 2
D1 3
D2 4
VH 5
Q2 6
Q1 7
RDY5 8
MAX783
36 SS3
35 CS3
34 FB3
33 DH3
32 LX3
31 BST3
30 DL3
29 V+
_______Typical Application Diagram
VPPA 9
VDD 10
28 VL
27 FB5
5.5V
TO
30V
VPP 4
CONTROL
ON3
ON5
SYNC
SHDN
MAX783
+3.3V
POWER
SECTION
µP
MEMORY
+5V PERIPHERALS
SUSPEND POWER
LOW-BATTERY WARNING
VPP (0V/3.3V/5V/12V)
VPP (0V/3.3V/5V/12V)
DUAL
PCMCIA
SLOTS
VPPB 11
GND 12
REF 13
SYNC 14
DA1 15
DA0 16
DB1 17
DB0 18
SSOP
26 PGND
25 DL5
24 BST5
23 LX5
22 DH5
21 CS5
20 SS5
19 ON5
Idle-Mode is a trademark of Maxim Integrated Products. Pentium is a trademark of Intel. PowerPC is a trademark of IBM.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.

MAX783 datasheet
Triple-Output Power-Supply Controller
for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
V+ to GND .................................................................-0.3V, +36V
PGND to GND........................................................................±2V
VL to GND ...................................................................-0.3V, +7V
BST3, BST5 to GND ..................................................-0.3V, +36V
LX3 to BST3.................................................................-7V, +0.3V
LX5 to BST5.................................................................-7V, +0.3V
InS(pDSu15ts,,/DCO2Su,5tpS—, uHF—tBDs—5Nt–,o,R—GOD—NNY—5D5–,,RCESF3,,SFYBN3C, ,SDS3A,1O, DNA3)0.,-0D.B3V1,,
DB0, ON5,
(VL + 0.3V)
VDD to GND.................................................................-0.3V, 20V
VPPA, VPPB to GND.....................................-0.3V, (VDD + 0.3V)
VH to GND ...................................................................-0.3V, 20V
Q1, Q2 to GND................................................-0.3V, (VH + 0.3V)
DL3, DL5 to PGND..........................................-0.3V , (VL + 0.3V)
DH3 to LX3 ..................................................-0.3V, (BST3 + 0.3V)
DH5 to LX5 ..................................................-0.3V, (BST5 + 0.3V)
REF, VL, VPP Short to GND........................................Momentary
REF Current.........................................................................20mA
VL Current ...........................................................................50mA
VPPA, VPPB Current .........................................................100mA
Continuous Power Dissipation (TA = +70°C)
SSOP (derate 11.76mW/°C above +70°C) ...................762mW
Operating Temperature Ranges:
MAX783CBX/MAX783_CBX.................................0°C to +70°C
MAX783EBX/MAX783_EBX ..............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V+ = 15V, GND = PGND = 0V, IVL = IREF = 0mA, S—H—D—N– = ON3 = ON5 = 5V, other digital input levels are 0V or +5V,
TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
CONDITIONS
3.3V AND 5V STEP-DOWN CONTROLLERS
Input Supply Range
FB5 Output Voltage
0mV < (CS5-FB5) < 70mV, 6V < V + < 30V
(includes load and line regulation)
FB3 Output Voltage
MAX783
0mV < (CS3-FB3) < 70mV, 6V < V + < 30V
(includes load and line regulation)
MAX783R
MAX783S
Load Regulation
Either controller (0mV to 70mV)
Line Regulation
Either controller (6V to 30V)
Current-Limit Voltage
CS3-FB3 or CS5-FB5
CS3-FB3 (VDD < 13V, flyback mode)
SS3/SS5 Source Current
SS3/SS5 Fault Sink Current
15V FLYBACK CONTROLLER
VDD Regulation Setpoint
Falling edge, hysteresis = 1%
VDD Shunt Setpoint
Rising edge, hysteresis = 1%
VDD Shunt Current
VDD = 20V
Quiescent VDD Current
VDD = 18V, ON3 = ON5 = 5V, VPPA/VPPB programmed to
12V with no external load
Off VDD Current
VDD = 18V, ON3 = ON5 = 5V, VPPA/VPPB programmed to
0V
PCMCIA REGULATORS (Note 1)
VPPA/VPPB Output Voltage
Program to 12V, 13V < VDD < 19V, 0mA < IL < 60mA
Program to 5V, 13V < VDD < 19V, 0mA < IL < 60mA
Program to 3.3V, 13V < VDD < 19V, 0mA < IL < 60mA
Program to 0V, 13V < VDD < 19V, 0mA < IL < 0.3mA
MIN TYP
5.5
4.80
3.17
3.32
3.46
80
-50
2.5
2
5.08
3.35
3.50
3.65
2.5
0.03
100
-100
4.0
13
18
23
140
15
11.60
4.85
3.17
-0.30
12.10
5.05
3.30
MAX UNITS
30
5.20
3.46
3.60
3.75
120
-160
6.5
V
V
V
%
%/V
mV
µA
mA
14 V
20 V
mA
300 µA
30 µA
12.50
5.20
3.43
0.30
V
2 _______________________________________________________________________________________




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