|
|
PDF MAX1540A Data sheet ( Hoja de datos )
| Número de pieza | MAX1540A | |
| Descripción | Dual Step-Down Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX1540A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
19-2861; Rev 3; 2/07
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
General Description
The MAX1540A/MAX1541 dual pulse-width modulation
(PWM) controllers provide the high efficiency, excellent
transient response, and high DC-output accuracy nec-
essary for stepping down high-voltage batteries to gen-
erate low-voltage chipset and RAM power supplies in
notebook computers.
The Maxim proprietary Quick-PWM™ controllers are
free running, constant on-time with input feed forward.
This configuration provides ultra-fast transient
response, wide input-output (I/O) differential range, low
supply current, and tight load-regulation characteris-
tics. The controllers can accurately sense the inductor
current across an external current-sense resistor in
series with the output to ensure reliable overload and
inductor saturation protection. Alternatively, the con-
trollers can use the synchronous rectifier itself or loss-
less inductor current-sensing methods to provide
overload protection with lower power dissipation.
For a single step-down PWM controller with inductor-
saturation protection, external-reference input voltage,
and dynamically selectable output voltages, refer to the
MAX1992/MAX1993 data sheet.
Applications
Notebook Computers
Core/I/O Supplies as Low as 0.7V
0.7V to 5.5V Supply Rails
CPU/Chipset/GPU with Dynamic Voltage Core
Supplies (MAX1541)
DDR Memory Termination (MAX1541)
Active Termination Buses (MAX1541)
Ordering Information
PART
TEMP RANGE
MAX1540AETJ -40°C to +85°C
MAX1540AETJ+ -40°C to +85°C
MAX1541ETL -40°C to +85°C
MAX1541ETL+ -40°C to +85°C
+Denotes a lead-free package.
PIN-
PACKAGE
32 Thin QFN
5mm x 5mm
32 Thin QFN
5mm x 5mm
40 Thin QFN
6mm x 6mm
40 Thin QFN
6mm x 6mm
PKG
CODE
T3255-4
T3255-4
T4066-5
T4066-5
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
Features
♦ Inductor-Saturation Protection
♦ Accurate Differential Current-Sense Inputs
♦ Dual Ultra-High-Efficiency Quick-PWMs with
100ns Load-Step Response
♦ MAX1540A
1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable
Output (OUT1)
2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable
Output (OUT2)
Fixed 5V, 100mA Linear Regulator
♦ MAX1541
External Reference Input (REFIN1)
Dynamically Selectable Output Voltage—0.7V
to 5.5V (OUT1)
2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable
Output (OUT2)
Optional Power-Good and Fault Blanking
During Transitions
Fixed 5V or Adjustable 100mA Linear Regulator
♦ 1% VOUT Accuracy over Line and Load
♦ 2V to 28V Battery Input Range
♦ 170kHz to 620kHz Selectable Switching
Frequency
♦ Overvoltage/Undervoltage-Protection Option
♦ 1.7ms Digital Soft-Start
♦ Drives Large Synchronous-Rectifier FETs
♦ 2V ±0.7% Reference Output
♦ Separate Power-Good Window Comparators
Pin Configurations
TOP VIEW
DH1 25
PGOOD1 26
OUT1 27
FB1 28
CSN1 29
CSP1 30
ON2 31
ON1 32
MAX1540A
16 BST2
15 LX2
14 DH2
13 PGOOD2
12 OUT2
11 FB2
10 CSN2
9 CSP2
THIN QFN
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, VCC = VDD = ON1 = ON2 = 5V, SKIP = GND, LDOIN (MAX1541) = V+, TA = 0°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.)
PARAMETER
REFERENCE (REF)
Reference Voltage
Reference Load Regulation
REF Lockout Voltage
REFIN1 (MAX1541)
Voltage Range
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VREF
ΔVREF
VREF(UVLO)
VCC = 4.5V to 5.5V, TA = +25°C to +85°C
IREF = 0V
TA = 0°C to +85°C
IREF = -10µA to +50µA
Rising edge, hysteresis = 350mV
1.986
1.983
-0.01
VREFIN
0.7
2.00
2.00
1.95
2.014
2.017
+0.01
VREF
V
V
V
V
REFIN1 (MAX1541)
Input Bias Current
IREFIN1
0.01 0.05
µA
FAULT DETECTION
Overvoltage Trip Threshold
With respect to error-comparator threshold,
12
16
20
OVP/UVP = VCC
%
Overvoltage Fault-Propagation
Delay
tOVP FB forced 2% above trip threshold
10 µs
Output Undervoltage-Protection
Trip Threshold
With respect to error-comparator threshold,
65
70
75
OVP/UVP = VCC
%
Output Undervoltage-Protection
Blanking Time
tBLANK From rising edge of ON_
10 35 ms
Output Undervoltage Fault-
Propagation Delay
tUVP
10 µs
PGOOD_ Lower Trip Threshold
With respect to error-comparator threshold,
hysteresis = 1%
-13
-10
-7
%
PGOOD_ Upper Trip Threshold
PGOOD_ Propagation Delay
PGOOD_ Output Low Voltage
PGOOD_ Leakage Current
Fault-Blanking Time
(MAX1541 Only)
Thermal-Shutdown Threshold
tPGOOD_
IPGOOD_
tFBLANK
TSHDN
With respect to error-comparator threshold,
hysteresis = 1%
FB forced 2% beyond PGOOD_ trip threshold
ISINK = 4mA
FB = REF (PGOOD high impedance),
PGOOD forced to 5.5V
FBLANK = VCC
FBLANK = open
FBLANK = REF
Hysteresis = 10°C
LDOON = VCC
LDOON = GND
+7
120
80
35
+10
10
220
140
65
+150
+160
+13
0.3
1
320
205
95
%
µs
V
µA
µs
°C
VCC Undervoltage-Lockout
Threshold
VUVLO(VCC)
Rising edge, PWM disabled below this
level, hysteresis = 20mV
4.1 4.25 4.4
V
CURRENT LIMIT
ILIM_ Adjustment Range
0.25 2 V
Current-Limit Input Range
CSP_
CSN_
0 2.7
V
-0.3 +28
CSP_/CSN_ Input Current
0.5 µA
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
Typical Operating Characteristics (continued)
(MAX1541 circuit of Figure 12, VIN = 12V, VDD = VCC = 5V, SKIP = GND, TON = REF, TA = +25°C, unless otherwise noted.)
1.0V OUTPUT VOLTAGE (OUT1)
vs. LOAD CURRENT
1.02
SKIP = GND
SKIP = VCC
1.01
OUT2 SWITCHING FREQUENCY
vs. LOAD CURRENT
(VOUT2 = 2.5V)
600
500
400
OUT1 SWITCHING FREQUENCY
vs. LOAD CURRENT
(VOUT1 = 1.0V)
600
500
400
1.00 300 300
0.99
0.98
0
1234
LOAD CURRENT (A)
5
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
450
2.5V OUTPUT
SKIP = VCC
400
4A LOAD
350
NO LOAD
300
250
200
0
1.00
4 8 12 16 20 24
INPUT VOLTAGE (V)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(PULSE-SKIPPING OPERATION)
28
IBIAS
0.10
0.01
0
IN
SKIP = GND
ON1 = ON2 = VCC
4 8 12 16 20 24 28
INPUT VOLTAGE (V)
200
100
0
0
SKIP = GND
SKIP = VCC
1234
LOAD CURRENT (A)
5
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
6.0
2.5V OUTPUT
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
0 4 8 12 16 20 24
INPUT VOLTAGE (V)
28
2.0V REFERENCE LOAD REGULATION
4
3
2
1
0
-1
-2
-3
-4
-20
0 20 40 60 80
REFERENCE LOAD CURRENT (μA)
100
200
100
0
0
20
SKIP = GND
SKIP = VCC
1234
LOAD CURRENT (A)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(FORCED-PWM OPERATION)
5
16
IBIAS
12
IIN
8
4
SKIP = ON1 = ON2 = VCC
0
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
REFERENCE DISTRIBUTION
50
SAMPLE SIZE = 50
40
30
20
10
0
1.990
1.995 2.000 2.005
REFERENCE VOLTAGE (V)
2.010
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1540A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX1540 | (MAX1540 / MAX1541) Dual Step-Down Controllers with Saturation Protection / Dynamic Output and Linear Regulator | Maxim Integrated Products |
| MAX1540A | Dual Step-Down Controllers | 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 |