|
|
PDF MAX8732 Data sheet ( Hoja de datos )
| Número de pieza | MAX8732 | |
| Descripción | (MAX8732 - MAX8734) Main Power-Supply Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX8732 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
19-3355; Rev 0; 8/04
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
General Description
The MAX8732/MAX8733/MAX8734 dual step-down,
switch-mode power-supply (SMPS) controllers generate
logic-supply voltages in battery-powered systems. The
MAX8732/MAX8733/MAX8734 include two pulse-width
modulation (PWM) controllers, adjustable from 2V to 5.5V
or fixed at 5V and 3.3V. These devices feature two linear
regulators providing 5V and 3.3V always-on outputs. Each
www.DataSheelint4eUa.crormegulator provides up to 100mA output current with
automatic linear-regulator bootstrapping to the main
SMPS outputs. The MAX8732/MAX8733/MAX8734 include
on-board power-up sequencing, a power-good (PGOOD)
output, digital soft-start, and internal soft-stop output dis-
charge that prevents negative voltages on shutdown.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant on-time PWM control scheme operates without
sense resistors and provides 100ns response to load tran-
sients while maintaining a relatively constant switching fre-
quency. The unique ultrasonic pulse-skipping mode
maintains the switching frequency above 25kHz, which
eliminates noise in audio applications. Other features
include pulse skipping, which maximizes efficiency in
light-load applications, and fixed-frequency PWM mode,
which reduces RF interference in sensitive applications.
The MAX8732 features a 200kHz/5V and 300kHz/3.3V
SMPS for highest efficiency, while the MAX8733 features
a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light”
applications. The MAX8734 provides a pin-selectable
switching frequency, allowing either 200kHz/300kHz or
400kHz/500kHz operation of the 5V/3.3V SMPSs, respec-
tively. The MAX8732/MAX8733/MAX8734 are available in
28-pin QSOP packages and operate over the extended
temperature range (-40°C to +85°C).
The MAX8732/MAX8733/MAX8734 are pin-for-pin
upgrades to the MAX1777/MAX1977/MAX1999.
The MAX1999 Evaluation Kit can be used to evaluate
the MAX8732/MAX8733/MAX8734.
Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
Features
♦ No Current-Sense Resistor Needed (MAX8734)
♦ Accurate Current Sense with Current-Sense
Resistor (MAX8732/MAX8733)
♦ 1.5% Output Voltage Accuracy
♦ 3.3V and 5V 100mA Bootstrapped Linear
Regulators
♦ Internal Soft-Start and Soft-Stop Output
Discharge
♦ Quick-PWM with 100ns Load Step Response
♦ 3.3V and 5V Fixed or Adjustable Outputs
(Dual Mode™)
♦ 4.5V to 24V Input Voltage Range
♦ Enhanced Ultrasonic Pulse-Skipping Mode
(25kHz min)
♦ Power-Good (PGOOD) Signal
♦ Overvoltage Protection Enable/Disable
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
5V/3V
SWITCHING
FREQUENCY
MAX8732EEI -40°C to +85°C 28 QSOP 200kHz/300kHz
MAX8733EEI -40°C to +85°C 28 QSOP 400kHz/500kHz
MAX8734EEI -40°C to +85°C 28 QSOP
200kHz/300kHz or
400kHz/500kHz
Pin Configurations
TOP VIEW
N.C. 1
PGOOD 2
ON3 3
ON5 4
ILIM3 5
SHDN 6
FB3 7
REF 8
FB5 9
PRO 10
ILIM5 11
SKIP 12
TON 13
BST5 14
MAX8734
28 BST3
27 LX3
26 DH3
25 LDO3
24 DL3
23 GND
22 OUT3
21 OUT5
20 V+
19 DL5
18 LDO5
17 VCC
16 DH5
15 LX5
QSOP
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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  
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, V SHDN = 5V,
TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
OUT3, OUT5 Discharge-Mode
On-Resistance
12 40
Ω
OUT3, OUT5 Discharge-Mode
www.DataSheeSt4yUn.cchormonous Rectifier
Turn-On Level
0.2 0.3 0.4
V
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, V SHDN = 5V,
TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
MAIN SMPS CONTROLLERS
V+ Input Voltage Range
3.3V Output Voltage in
Fixed Mode
CONDITIONS
LDO5 in regulation
V+ = LDO5, VOUT5 < 4.41V
V+ = 6V to 24V, FB3 = GND, V SKIP = 5V
MIN TYP MAX UNITS
6
4.5
3.27
24
5.5
3.39
V
V
5V Output Voltage in Fixed Mode
V+ = 6V to 24V, FB5 = GND, V SKIP = 5V,
MAX8732/MAX8734 (TON = VCC)
V+ = 7V to 24V, FB5 = GND, V SKIP = 5V,
MAX8733/MAX8734 (TON = GND)
4.95 5.15 V
Output Voltage in
Adjustable Mode
Output Voltage Adjust Range
V+ = 6V to 24V, either SMPS
Either SMPS
1.97
2.0
2.03 V
5.5 V
FB3, FB5 Adjustable-Mode
Threshold Voltage
Dual-Mode comparator
0.1 0.2 V
Current-Limit Threshold
(Positive, Default)
ILIM_ = VCC, GND - CS_ (MAX8732/MAX8733),
GND - LX_ (MAX8734)
Current-Limit Threshold
(Positive, Adjustable)
On-Time Pulse Width
Minimum Off-Time
GND - CS_
(MAX8732/MAX8733),
GND - LX_ (MAX8734)
MAX8732 or MAX8734
(VTON = 5V)
MAX8733 or MAX8734
(VTON = 0)
VILIM_ = 0.5V
VILIM_ = 1V
VILIM_ = 2V
VOUT5 = 5.05V
VOUT3 = 3.33V
VOUT5 = 5.05V
VOUT3 = 3.33V
INTERNAL REGULATOR AND REFERENCE
LDO5 Output Voltage
ON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO5 < 100mA
LDO5 Undervoltage-Lockout
Fault Threshold
Falling edge of LDO5, hysteresis = 1%
90
40
90
180
1.895
0.833
0.895
0.475
200
4.90
3.7
110
60
110
220
2.315
1.017
1.209
0.635
400
mV
mV
µs
ns
5.10 V
4.3 V
_______________________________________________________________________________________ 5
5 Page 
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
Typical Operating Characteristics (continued)
(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, SHDN = V+,
RCS = 7mΩ, VILIM_ = 0.5V, TA = +25°C, unless otherwise noted.)
MAX8733/MAX8734 (TON = GND)
5V PWM-MODE
LOAD TRANSIENT RESPONSE
MAX8732/3/4 toc28
MAX8732/MAX8734 (TON = VCC)
3.3V PWM-MODE
LOAD TRANSIENT RESPONSE
MAX8732/3/4 toc29
MAX8733/MAX8734 (TON = GND)
3.3V PWM-MODE
LOAD TRANSIENT RESPONSE
MAX8732/3/4 toc30
www.DataSheet4U.com
5V
VOUT,
AC-
COUPLED
100mV/div
3.3V
VOUT,
AC-
COUPLED
100mV/div
3.3V
VOUT,
AC-
COUPLED
100mV/div
4A INDUCTOR 4A INDUCTOR 4A INDUCTOR
CURRENT
CURRENT
CURRENT
1A
2A/div
1A
2A/div
1A
2A/div
5V 5V
5V
DL5 DL3
DL3
0
5V/div
0
5V/div
0
5V/div
10µs/div
20µs/div
10µs/div
5V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = VCC)
100
90
80
VIN = 12V
70
60 VIN = 24V
50
40
30
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
5V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = GND)
100
90 VIN = 12V
80
70 VIN = 24V
60
50
40
30
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
3.3V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = VCC)
100
90
80
70 VIN = 7V
60
VIN = 12V
50
40
30 VIN = 24V
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
3.3V ULTRASONIC EFFICIENCY
vs. LOAD CURRENT (TON = GND)
100
90 VIN = 7V
80
70 VIN = 12V
60
50 VIN = 24V
40
30
20
10
0
0.001
0.01 0.1
1
LOAD CURRENT (A)
10
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX8732.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX873 | Low-Power / Low-Drift / +2.5V/+5V/+10V Precision Voltage References |  Maxim Integrated |
| MAX8730 | Low-Cost Battery Charger | Maxim Integrated Products |
| MAX8731 | SMBus Level 2 Battery Charger | Maxim Integrated Products |
| MAX8731A | SMBus Level 2 Battery Charger | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |