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PDF MAX17544 Data sheet ( Hoja de datos )
| Número de pieza | MAX17544 | |
| Descripción | Synchronous Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX17544 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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MAX17544
EVALUATION KIT AVAILABLE
4.5V–42V, 3.5A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
General Description
The MAX17544 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over 4.5V to 42V input. The converter can deliver
up to 3.5A and generates output voltages from 0.9V up to
0.9 x VIN. The feedback (FB) voltage is accurate to within
±1.1% over -40°C to +125°C.
The MAX17544 uses peak-current-mode control. The
device can be operated in pulse-width modulation (PWM),
pulse-frequency modulation (PFM), or discontinuous
conduction mode (DCM) control schemes.
The device is available in a 20-pin (5mm x 5mm) TQFN
package. Simulation models are available.
Applications
●● Industrial Power Supplies
●● Distributed Supply Regulation
●● High-Voltage Single-Board Systems
●● Base Station Power Supply
●● General-Purpose Point-of-Load
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX17544.related.
Benefits and Features
●● Reduces External Components and Total Cost
• No Schottky—Synchronous Operation
• Internal Compensation for Any Output Voltage
• Built-In Soft-Start
• All-Ceramic Capacitors, Compact Layout
●● Reduces Number of DC-DC Regulators to Stock
• Wide 4.5V to 42V Input
• Adjustable 0.9V to 0.9 x VIN Output
• 100kHz to 2.2MHz Adjustable Switching Frequency
with External Synchronization
●● Reduces Power Dissipation
• Peak Efficiency > 90%
• PFM/DCM Enables Enhanced Light-Load
Efficiency
• 2.8µA Shutdown Current
●● Operates Reliably in Adverse Industrial Environments
• Peak Current-Limit Protection
• Built-In Output Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Load
• Overtemperature Protection
• -40°C to +125°C Operation
Ordering Information appears at end of data sheet.
Typical Application Circuit—5V, 500kHz Switching Frequency
VIN
(7.5V TO 42V)
C2
2.2µF
EN/UVLO VIN VIN
RT
SYNC
MODE
VCC
SGND
MAX17544
VIN
BST
LX
LX
LX
FB
RESET
CF SS
PGND PGND PGND
C3
12000pF
C1
2.2µF
C8
2.2µF
C5
0.1µF
L1
10µH
VOUT
5V, 3.5A
C4
22µF
C9
22µF
R3
100kΩ
fSW = 500kHz
R4
22.1kΩ
19-7055; Rev 0; 9/14
1 page  
MAX17544
4.5V–42V, 3.5A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
Typical Operating Characteristics
(VIN = VEN/UVLO = 24V, VPGND = VSGND = 0V, CVIN = CVCC = 2.2µF, CBST = 0.1µF, CSS = 5600pF, RT = MODE = open, TA = TJ = -40°C
to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.)
5V OUTPUT, PWM MODE,
FIGURE 4A CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC01
90
80
VIN = 36V
70 VIN = 24V
VIN = 12V
60
50
40
0
MODE = SGND
500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
3.3V OUTPUT, PFM MODE,
FIGURE 4B CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC04
90
80
70
60
50
40
30
1
VIN = 24V VIN = 36V
VIN = 12V
MODE = OPEN
10 100 1000 3500
LOAD CURRENT (mA)
3.3V OUTPUT, PWM MODE,
FIGURE 4B CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC02
90
80
70 VIN = 24V VIN = 36V
VIN = 12V
60
50
40
0
MODE = SGND
500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
5V OUTPUT, DCM MODE,
FIGURE 4A CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC05
90
VIN = 36V
80
70 VIN = 24V
60 VIN = 12V
50
40
30
1
MODE = VCC
10 100 1000
LOAD CURRENT (mA)
5V OUTPUT, PFM MODE,
FIGURE 4A CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC03
90
80
70
60 VIN = 24V VIN = 36V
50 VIN = 12V
40
30
1
MODE = OPEN
10 100 1000 3500
LOAD CURRENT (mA)
3.3V OUTPUT, DCM MODE,
FIGURE 4B CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC06
90
VIN = 36V
80 VIN = 24V
70
VIN = 12V
60
50
40
30
1
MODE = VCC
10 100 1000
LOAD CURRENT (mA)
5V OUTPUT, PWM MODE,
FIGURE 4ACIRCUIT,
5.08 LOAD AND LINE REGULATION TOC07
5.07
5.06
5.05 VIN = 36V
5.04
5.03
5.02
5.01
5.00 VIN = 12V
VIN = 24V
4.99
4.98
0
500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
3.3V OUTPUT, PWM MODE,
FIGURE 4B CIRCUIT,
LOAD AND LINE REGULATION
3.36 TOC08
3.35
3.34
3.33
3.32
3.31
3.3
3.29
3.28 VIN = 12V VIN = 36V
VIN = 24V
3.27
3.26
0
500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
5V OUTPUT, PFM MODE,
FIGURE 4A CIRCUIT,
LOAD AND LINE REGULATION
5.5 TOC09
5.4
5.3 VIN = 24V
5.2
5.1
5
4.9
4.8 VIN = 12V
4.7 VIN = 36V
4.6
4.5
0
500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17544
4.5V–42V, 3.5A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
Pin Description (continued)
PIN NAME
FUNCTION
12 VCC 5V LDO Output. Bypass VCC with 2.2µF ceramic capacitance to SGND.
13 SGND Analog Ground
14–16
PGND
Power Ground. Connect the PGND pins externally to the power ground plane. Connect the SGND and
PGND pins together at the ground return path of the VCC bypass capacitor. Refer to the MAX17544 EV
kit data sheet for a layout example.
17–19
20
LX
BST
Switching Node. Connect LX pins to the switching side of the inductor. Refer to the MAX17544 EV kit
data sheet for a layout example.
Boost Flying Capacitor. Connect a 0.1µF ceramic capacitor between BST and LX.
Exposed Pad. Connect to the SGND pin. Connect to a large copper plane below the IC to improve heat
— EP dissipation capability. Add thermal vias below the exposed pad. Refer to the MAX17544 EV kit data sheet
for a layout example.
Block Diagram
VCC
SGND
EN/UVLO
RT
SYNC
CF
FB
SS
5V
LDO
MAX17544
1.215V
CURRENT-SENSE
LOGIC
HICCUP
PWM/
PFM/
HICCUP
LOGIC
AND
DRIVERS
OSCILLATOR
ERROR AMPLIFIER/
LOOP COMPENSATION
VCC
SWITCHOVER VBG = 0.9V
LOGIC
5µA
MODE
SELECTION
LOGIC
SLOPE
COMPENSATION
HICCUP
FB
EN/UVLO
RESET
LOGIC
BST
VIN
LX
PGND
MODE
RESET
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX17544.PDF ] | |
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