|
|
PDF MAX1641D Data sheet ( Hoja de datos )
| Número de pieza | MAX1641D | |
| Descripción | Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX1641D (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
|
No Preview Available !
19-1245; Rev 0; 7/97
EVAALVUAAILTAIOBNLEKIT
Adjustable-Output, Switch-Mode
Current Sources with Synchronous Rectifier
_______________General Description
The MAX1640/MAX1641 CMOS, adjustable-output,
switch-mode current sources operate from a +5.5V to
+26V input, and are ideal for microprocessor-controlled
battery chargers. Charging current, maximum output
voltage, and pulse-trickle charge are programmed with
external resistors. Programming the off-time modifies
the switching frequency, suppressing undesirable har-
monics in noise-sensitive circuits. The MAX1640’s high-
side current sensing allows the load to connect directly
to ground, eliminating ground-potential errors. The
MAX1641 incorporates a low-side current sense.
The MAX1640/MAX1641 step-down pulse-width-modu-
lation (PWM) controllers use an external P-channel
MOSFET switch and an optional, external N-channel
MOSFET synchronous rectifier for increased efficiency.
An internal low-dropout linear regulator provides power
for the internal reference and circuitry as well as the
gate drive for the N-channel synchronous rectifier.
The MAX1640/MAX1641 are available in space-saving,
16-pin narrow QSOP packages.
________________________Applications
Battery-Powered Equipment
Laptop, Notebook, and Palmtop Computers
Handy Terminals
Portable Consumer Products
Cordless Phones
Cellular Phones
PCS Phones
Backup Battery Charger
__________________Pin Configuration
TOP VIEW
LDOL 1
TOFF 2
D1 3
D0 4
CC 5
REF 6
SET 7
TERM 8
MAX1640
MAX1641
16 IN
15 LDOH
14 PDRV
13 NDRV
12 PGND
11 CS+
10 CS-
9 GND
____________________________Features
o 95% Efficiency
o +5.5V to +26V Input Supply Range
o 2V to 24V Adjustable-Output Voltage Range
o 100% Maximum Duty Cycle (Low Dropout)
o Up to 500kHz PWM Operation
o Optional Synchronous Rectifier
o 16-Pin QSOP Package
o Current-Sense Accuracy: 2% (MAX1641)
5.3% (MAX1640)
______________Ordering Information
PART
MAX1640C/D
MAX1640EEE
MAX1641C/D
MAX1641EEE
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
16 QSOP
Dice*
16 QSOP
*Dice are specified at TA = +25°C, DC parameters only.
__________Typical Operating Circuit
VIN = +5.5V TO +26V
RTOFF
IN
D0
D1
TOFF
REF
LDOH
PDRV
NDRV
PGND
CS+
SET
CS-
MAX1640
CC
GND
TERM
LDOL
P
OUT
QSOP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
1 page  
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
CURRENT-MODE CHANGE RESPONSE TIME
EXITING OFF MODE
AA
0A
0V
BB
2ms/div
VIN = 12V, VSET = 1V, RLOAD = 4Ω, NO OUTPUT CAPACITOR
A: OUTPUT CURRENT, D0 = D1 = 0 1A/div
B: LOAD VOLTAGE, AC coupled, 500mV/div
20µs/div
VIN = 12V, RLOAD = 4Ω
A: D0 = D1 = 1 2V/div
B: OUTPUT CURRENT, 0.5A/div
______________________________________________________________Pin Description
PIN NAME
FUNCTION
1
LDOL
Internal, Ground-Referenced Low-Dropout Linear Regulator Output.
Bypass with a 0.1µF capacitor in parallel with a 4.7µF capacitor to GND.
Off-Time Select Input. A resistor (RTOFF) connected from this pin to GND programs the off-time for the hys-
2 TOFF teretic PWM step-down converter. This resistor also sets the period in duty-cycle mode. See Duty-Cycle
Mode and Programming the Off-Time.
3, 4 D1, D0 Digital Inputs. Select mode of operation (Table 1).
5 CC Constant-Current Loop Compensation Input. Bypass with a 0.01µF capacitor to GND.
6 REF Reference Voltage Output (VREF = 2V). Bypass with a 0.1µF capacitor to GND.
7
SET
Current Select Input. Program the desired current level by applying a voltage at SET between 0V and VREF,
(I = VSET / 13.3RSENSE). See Figure 3.
8
TERM
Maximum Output Voltage Termination Input. When VTERM exceeds the reference voltage, the comparator
resets the internal PWM latch, shutting off the external P-channel FET.
9 GND Ground
10 CS- Negative Current-Sense Comparator Input
11
CS+
Positive Current-Sense Comparator Input
12 PGND High-Current Ground Return for the output drivers
13 NDRV Gate Drive for an optional N-channel FET synchronous rectifier
14 PDRV Gate Drive for the P-channel FET
15
LDOH
Internal, Input-Referenced Low-Dropout Linear Regulator Output.
Bypass with a 0.33µF capacitor to IN.
16 IN Power-Supply Input. Input of the internal, low-dropout linear regulators.
_______________________________________________________________________________________ 5
5 Page 
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
configuration to PGND. These traces should be wide to
reduce resistance and as short as possible to reduce
stray inductance. All low-current ground paths should
be connected to GND. Place the input bypass capaci-
tor as close as possible to the IN pin. See MAX1640 EV
kit for layout example.
___________________Chip Information
TRANSISTOR COUNT: 1233
________________________________________________________Package Information
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX1641D.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX1641 | Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier | Maxim Integrated |
| MAX1641C | Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier | Maxim Integrated |
| MAX1641D | Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier | Maxim Integrated |
| MAX1641EEE | Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier | Maxim Integrated |
| 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 |