|
|
PDF MAX17530 Data sheet ( Hoja de datos )
| Número de pieza | MAX17530 | |
| Descripción | Synchronous Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX17530 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
MAX17530
42V, 25mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
General Description
The MAX17530 high-efficiency, high-voltage,
synchronous step-down DC-DC converter with integrated
MOSFETs operates over a 4V to 42V input. The converter
can deliver up to 25mA and generates output voltages
from 0.8V up to 0.9 x VIN. The feedback (FB) voltage is
accurate to within ±1.75% over -40°C to +125°C.
The MAX17530 uses peak-current-mode control. The
device can be operated in pulse-width modulation (PWM)
or pulse-frequency modulation (PFM) modes.
The device is available in a 10-pin (3mm x 2mm) TDFN
and 10-pin (3mm x 3mm) μMAX® packages. Simulation
models are available.
Applications
●● Industrial Sensors and Process Control
●● High-Voltage LDO Replacement
●● Battery-Powered Equipment
●● HVAC and Building Control
Ordering Information appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features and Benefits
●● Reduces External Components and Total Cost
• No Schottky–Synchronous
• Internal Compensation for Any Output Voltage
• Built-In Soft-Start
• All-Ceramic Capacitors, Compact Layout
●● Reduces Number of DC-DC Regulators to Stock
• Wide 4V to 42V Input
• Adjustable 0.8V to 0.9 x VIN Output
• 100kHz to 2.2MHz Adjustable Switching Frequency
with External Synchronization
●● Reduces Power Dissipation
• 22µA Quiescent Current
• Peak Efficiency > 90%
• PFM Enables Enhanced Light-Load Efficiency
• 1.2µA Shutdown Current
●● Operates Reliable in Adverse Environments
• Peak Current-Limit Protection
• Built-In Output-Voltage Monitoring RESET
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Load
• Overtemperature Protection
• -40°C to +125°C Operation
Typical Application Circuits—High-Efficiency 5V, 25mA Regulator
VIN
6V TO 42V
CIN
1µF
R3
191kΩ
IN LX
MAX17530
EN/UVLO
GND
SS
VOUT
MODE
RT/SYNC
FB
RESET
L1 VOUT
1mH 5V, 25mA
COUT
10µF
R4
22.1Ω
C1
0.22µF
R1
261kΩ
R2
49.9kΩ
L1 COILCRAFT LPS5030-105M
COUT MURATA 10µF/X7R/6.3V/0805 (GRM21BR70J106K)
CIN MURATA 1μF/X7R/50V/1206 (GRM31MR71H105K)
19-7381; Rev 0; 11/14
1 page  
MAX17530
42V, 25mA, Ultra-Small, High-Efficiency
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
Typical Operating Characteristics
(VIN = 24V, VGND = 0V, VOUT = 3.3V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, CIN = 1μF, TA = +25°C, unless otherwise noted)
100
90
80
70
60
50
40
30
20
10
0
1
EFFICIENCY vs. LOAD CURRENT
toc1
VIN = 12V
VIN = 24V
VIN = 36V
FIGURE 6 APPLICATION
CIRCUIT, PFM MODE
VOUT = 5V
10
LOAD CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0
1
EFFICIENCY VS. LOAD CURRENT
toc4
VIN = 6V
VIN = 12V
VIN = 24V
VIN = 36V
FIGURE 7 APPLICATION
CIRCUIT, PWM MODE
VOUT = 3.3V
6 11 16
LOAD CURRENT (mA)
21
OUTPUT VOLTAGE
vs. LOAD CURRENT
4.96 toc7
4.96 FIGURE 6 APPLICATION
CIRCUIT, PWM MODE
4.96
4.96
4.95
4.95 VIN = 12V VIN = 24V VIN = 36V
4.95
4.95
4.95
4.94
1
6 11 16
LOAD CURRENT (mA)
21
EFFICIENCY vs. LOAD CURRENT
100 toc2
90
80
70
60
50
40 VIN = 12V
VIN = 24V
VIN = 36V
30
20
10
0
1
FIGURE 7 APPLICATION
CIRCUIT, PFM MODE
VOUT = 3.3V
10
LOAD CURRENT (mA)
5.06
5.04
5.02
5.00
4.98
4.96
4.94
1
OUTPUT VOLTAGE
vs. LOAD CURRENT
toc5
FIGURE 6 APPLICATION
CIRCUIT, PFM MODE
VIN = 12V VIN = 24V
VIN = 36V
6 11 16
LOAD CURRENT (mA)
21
OUTPUT VOLTAGE
vs. LOAD CURRENT
3.34 toc8
FIGURE 7 APPLICATION
CIRCUIT, PWM MODE
3.34
3.34
3.33
VIN = 12V
3.33
VIN = 24V
VIN = 36V
3.33
0
5 10 15 20
LOAD CURRENT (mA)
25
100
90
80
70
60
50
40
30
20
10
0
0
EFFICIENCY vs. LOAD CURRENT
toc3
VIN = 12V
VIN = 24V
VIN = 36V
FIGURE 6 APPLICATION
CIRCUIT, PWM MODE
VOUT = 5V
5 10 15 20
LOAD CURRENT (mA)
25
OUTPUT VOLTAGE
vs. LOAD CURRENT
3.40 toc6
FIGURE 7 APPLICATION
CIRCUIT, PFM MODE
3.38
VIN = 12V
3.36 VIN = 24V
VIN = 36V
3.34
3.32
1
6 11 16
LOAD CURRENT (mA)
21
FEEDBACK VOLTAGE
VS. TEMPERATURE
820 toc9
810
800
790
780
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17530
42V, 25mA, Ultra-Small, High-Efficiency
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
Detailed Description
The MAX17530 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over a 4V to 42V input voltage range. The
converter can deliver output current up to 25mA at output
voltages of 0.8V to 0.9 x VIN. The output voltage is accurate
to within ±1.75% over -40°C to +125°C. The converter
consumes only 22µA of supply current in PFM mode,
while regulating the output voltage at no load.
The device uses an internally-compensated,
peak-current-mode-control architecture (see the Block
Diagram). On the rising-edge of the internal clock, the
high-side pMOSFET turns on. An internal error-amplifier
compares the feedback voltage to a fixed internal reference
voltage and generates an error voltage. The error voltage
is compared to a sum of the current-sense voltage and
a slope-compensation voltage by a PWM comparator to
set the “on-time.” During the on-time of the pMOSFET,
the inductor current ramps up. For the remainder of the
switching period (off-time), the pMOSFET is kept off and
the low-side nMOSFET turns on. During the off-time,
the inductor releases the stored energy as the inductor
current ramps down, providing current to the output.
Under overload conditions, the cycle-by-cycle current-
limit feature limits inductor peak current by turning off
the high-side pMOSFET and turning on the low-side
nMOSFET.
Mode Selection (MODE)
The device features a MODE pin for selecting either the
forced-PWM or PFM modes of operation. If the MODE
pin is left unconnected, the device operates in PFM mode
at light loads. If the MODE pin is grounded, the device
operates in a constant-frequency forced-PWM mode at all
loads. The mode of operation can be changed on-the-fly
during normal operation of the device.
In PWM mode, the inductor current is allowed to go
negative. PWM operation is useful in frequency-sensitive
applications and provides fixed switching frequency at all
loads. However, the PWM mode of operation gives lower
efficiency at light loads when compared to the PFM mode of
operation.
PFM mode disables negative inductor current and
additionally skips pulses at light loads for high efficiency.
In PFM mode, the inductor current is forced to a fixed
peak of 23mA (typ) (IPFM) every clock cycle until the out-
put rises to 102% (typ) of the nominal voltage. Once the
output reaches 102% (typ) of the nominal voltage, both
high-side and low-side FETs are turned off and the device
enters hibernate operation until the load discharges the
output to 101% (typ) of the nominal voltage. Most of
the internal blocks are turned off in hibernate operation
to save quiescent current. After the output falls below
101% (typ) of the nominal voltage, the device comes
out of hibernate operation, turns on all internal blocks,
and again commences the process of delivering pulses
of energy to the output until it reaches 102% (typ) of the
nominal output voltage. The device naturally exits PFM
mode when the load current increases to a magnitude of
approximately:
IPFM - (ΔI/2)
where ΔI is the peak-peak ripple current in the output
inductor. The part enters PFM mode again if the load
current reduces to approximately (ΔI/2). See the Inductor
Selection section for details. The advantage of the PFM
mode is higher efficiency at light loads because of lower
current drawn from the supply.
Enable Input (EN/UVLO) and Soft-Start (SS)
When EN/UVLO voltage increases above 1.25V (typ), the
device initiates a soft-start sequence. The duration of the
soft-start depends on the status of the SS pin voltage at
the time of power-up. If the SS pin is not connected, the
device uses a fixed 5ms internal soft-start to ramp up the
internal error-amplifier reference. If a capacitor is connect-
ed from SS to GND, a 5μA current source charges the
capacitor and ramps up the SS pin voltage. The SS pin
voltage is used as reference for the internal error ampli-
fier. Such a reference ramp-up allows the output voltage
to increase monotonically from zero to the final set value
independent of the load current.
EN/UVLO can be used as an input voltage UVLO-
adjustment input. An external voltage-divider between
IN and EN/UVLO to GND adjusts the input voltage at
which the device turns on or turns off. See Setting the
Input Undervoltage-Lockout Level section for details.
If input UVLO programming is not desired, connect
EN/UVLO to IN (see the Electrical Characteristics table for
EN/UVLO rising and falling-threshold voltages). Driving
EN/UVLO low disables both power MOSFETs, as well as
other internal circuitry, and reduces IN quiescent current
to below 1.2μA. The SS capacitor is discharged with an
internal pulldown resistor when EN/UVLO is low. If the
EN/UVLO pin is driven from an external signal source,
a series resistance of minimum 1kW is recommended to
be placed between the signal source output and the EN/
UVLO pin, to reduce voltage ringing on the line.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX17530.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX17530 | Synchronous Step-Down DC-DC Converter | Maxim Integrated Products |
| MAX17535 | High-Frequency Low-Cost SMBus Chargers | Maxim Integrated Products |
| MAX17536 | Step-Down DC-DC Converter |  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 |