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PDF MAX782RCBX Data sheet ( Hoja de datos )
| Número de pieza | MAX782RCBX | |
| Descripción | Triple-Output Power-Supply Controller for Notebook Computers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0146; Rev 2; 5/94
InfEorvmalautaiotinonInKcliut ded
Triple-Output Power-Supply
Controller for Notebook Computers
_______________General Description
The MAX782 is a system-engineered power-supply con-
troller for notebook computers or similar battery-powered
equipment. It provides two high-performance step-down
(buck) pulse-width modulators (PWMs) for +3.3V and +5V,
and dual PCMCIA VPP outputs powered by an integral fly-
back winding controller. Other functions include dual, low-
dropout, micropower linear regulators for CMOS/RTC back-
up, and three precision low-battery-detection comparators.
High efficiency (95% at 2A; greater than 80% at loads
from 5mA to 3A) is achieved through synchronous recti-
fication and PWM operation at heavy loads, and Idle-
ModeTM operation at light loads. It uses physically
small components, thanks to high operating frequen-
cies (300kHz/200kHz) and a new current-mode PWM
architecture that allows for output filter capacitors as
small as 30µF per ampere of load. Line- and load-tran-
sient response are terrific, with a high 60kHz unity-gain
crossover frequency allowing 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 controller provides a low-cost,
+15V high-side output that regulates even in the
absence of a load on the main output.
Other features include low-noise, fixed-frequency PWM
operation at moderate to heavy loads and a synchroniz-
able oscillator for noise-sensitive applications such as
electromagnetic pen-based systems and communicat-
ing computers. The MAX782 is a monolithic BiCMOS IC
available in fine-pitch, SSOP surface-mount packages.
_______________________Applications
Notebook Computers
Portable Data Terminals
Communicating Computers
Pen-Entry Systems
______Typical Application Diagram
___________________________Features
o Dual PWM Buck Controllers (+3.3V and +5V)
o Dual PCMCIA VPP Outputs (0V/5V/12V)
o Three Precision Comparators or Level Translators
o 95% Efficiency
o 420µA Quiescent Current;
70µA in Standby (linear regulators alive)
o 5.5V to 30V Input Range
o Small SSOP Package
o Fixed Output Voltages Available:
3.3 (standard)
3.45 (High-Speed Pentium™)
3.6 (PowerPC™)
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX782CBX
0°C to +70°C 36 SSOP
MAX782RCBX 0°C to +70°C 36 SSOP
MAX782SCBX 0°C to +70°C 36 SSOP
Ordering Information continued on last page.
VOUT
3.3V
3.45V
3.6V
__________________Pin Configuration
TOP VIEW
ON3 1
D1 2
D2 3
D3 4
VH 5
Q3 6
Q2 7
Q1 8
VPPA 9
VDD 10
VPPB 11
MAX782
36 SS3
35 CS3
34 FB3
33 DH3
32 LX3
31 BST3
30 DL3
29 V+
28 VL
27 FB5
26 PGND
5.5V
TO
30V
VPP 4
CONTROL
ON3
ON5
SYNC
MAX782
+3.3V
POWER
SECTION
µP
MEMORY
+5V PERIPHERALS
SUSPEND POWER
LOW-BATTERY WARNING
VPP (0V/5V/12V)
VPP (0V/5V/12V)
DUAL
PCMCIA
SLOTS
GND 12
REF 13
SYNC 14
DA1 15
DA0 16
DB1 17
DB0 18
25 DL5
24 BST5
23 LX5
22 DH5
21 CS5
20 SS5
19 ON5
SSOP
™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.
1 page  
Triple-Output Power-Supply
Controller for Notebook Computers
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, Transpower transformer type TTI5870, TA = +25°C, unless otherwise noted.)
PULSE-WIDTH MODULATION MODE WAVEFORMS
IDLE-MODE WAVEFORMS
LX VOLTAGE
10V/div
LX VOLTAGE
10V/div
+5V OUTPUT
VOLTAGE
50mV/div
HORIZONTAL = 500ns/div
+5V OUTPUT CURRENT = 1A
INPUT VOLTAGE = 16V
+5V LOAD-TRANSIENT RESPONSE
3A
LOAD CURRENT
0A
+5V OUTPUT
VOLTAGE
50mV/div
HORIZONTAL = 5µs/div
+5V OUTPUT CURRENT = 42mA
INPUT VOLTAGE = 16V
+3.3V LOAD-TRANSIENT RESPONSE
3A
LOAD CURRENT
0A
HORIZONTAL = 200µs/div
VIN = 15V
+5V OUTPUT
50mV/div
HORIZONTAL = 200µs/div
VIN = 15V
+3.3V OUTPUT
50mV/div
_______________________________________________________________________________________ 5
5 Page 
Triple-Output Power-Supply
Controller for Notebook Computers
REF, 3.3V
(OR INTERNAL
5V REFERENCE)
SS_
ON_
–100mV
60kHz
LPF
MAIN PWM
COMPARATOR
SLOPE COMP
25mV
4µA
MINIMUM
CURRENT
(IDLE-MODE)
VL
CURRENT
LIMIT
0mV-100mV
30R
3.3V 1R
N
SYNCHRONOUS
RECTIFIER CONTROL
RQ
N
S
1X
R
Q
S
OSC
CS_
FB_
LEVEL
SHIFT
BST_
DH_
LX_
SHOOT-
THROUGH
CONTROL
LEVEL
SHIFT
VL
DL_
PGND
VDD REG
(SEE FIG. 2)
N
1µs
SINGLE-SHOT
Figure 3. PWM Controller Block Diagram
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX782RCBX.PDF ] | |
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