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PDF MAX17545 Data sheet ( Hoja de datos )
| Número de pieza | MAX17545 | |
| 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 MAX17545 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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MAX17545
EVALUATION KIT AVAILABLE
4.5V–42V, 1.7A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
With Internal Compensation
General Description
The MAX17545 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 1.7A 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 MAX17545 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 (4mm x 4mm) 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/MAX17545.related.
Features and Benefits
●● 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
C1
2.2µF
VIN
(6.5V TO 42V)
C2
2.2µF
EN/UVLO
RT
VIN VIN VIN
BST
SYNC
MODE
VCC
SGND
MAX17545
LX
LX
LX
FB
RESET
C5
0.1µF
L1
10µH
VOUT
5V, 1.7A
C4
22µF R3
178kΩ
R4
39kΩ
CF SS
C3
5.6nF
PGND PGND PGND
fSW = 500kHz
19-7056; Rev 0; 9/14
1 page  
MAX17545
4.5V–42V, 1.7A, 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.)
100
95
90
85
80
75
70
65
60
55
50
0
5V OUTPUT, PWM MODE,
FIGURE 4A CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
TOC01
VIN = 24V
VIN = 12V
VIN = 36V
MODE = SGND
500 1000
LOAD CURRENT (mA)
1500
3.3V OUTPUT, PFM MODE,
FIGURE 4B CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC04
90
80
70
60 VIN = 36V
VIN = 24V
50
40
30
1
VIN = 12V
MODE = OPEN
10 100
LOAD CURRENT (mA)
1000 1700
5V OUTPUT, PWM MODE,
FIGURE 4A CIRCUIT,
LOAD AND LINE REGULATION
5.05
TOC07
5.04
5.03
5.02
5.01
5 VIN = 12V VIN = 24V VIN = 36V
4.99
4.98
4.97
4.96
4.95
0
MODE = SGND
500 1000
LOAD CURRENT (mA)
1500
3.3V OUTPUT, PWM MODE,
FIGURE 4B CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC02
90
80
70
60
50
40
0
VIN = 24V
VIN = 12V
VIN = 36V
MODE = SGND
500 1000
LOAD CURRENT (mA)
1500
100
90
80
70
60
50
40
30
20
10
1
5V OUTPUT, DCM MODE,
FIGURE 4A CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
TOC05
VIN = 36V
VIN = 24V
VIN = 12V
MODE = VCC
10 100
LOAD CURRENT (mA)
1000
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 VIN= 24V
3.3
3.29
3.28
3.27 VIN= 12V
3.26
0 500
VIN= 36V MODE = SGND
1000 1500
LOAD CURRENT (mA)
5V OUTPUT, PFM MODE,
FIGURE 4A CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC03
90
80
70
60
50
40
1
VIN = 24V
VIN = 12V
VIN = 36V
MODE = OPEN
10 100
LOAD CURRENT (mA)
1000 1700
3.3V OUTPUT, DCM MODE,
FIGURE 4B CIRCUIT,
EFFICIENCY VS. LOAD CURRENT
100 TOC06
90
80 VIN = 36V
70 VIN = 24V
60
50 VIN = 12V
40
30
20
10
0
1
MODE = VCC
10 100
LOAD CURRENT (mA)
1000
5.5
5.4
5.3
5.2
5.1
5
4.9
4.8
4.7
4.6
4.5
0
5V OUTPUT, PFM MODE,
FIGURE 4A CIRCUIT,
LOAD AND LINE REGULATION
TOC09
VIN = 12V VIN = 24V VIN = 36V
MODE = OPEN
500 1000
LOAD CURRENT (mA)
1500
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17545
4.5V–42V, 1.7A, 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 MAX17545 EV
kit manual for a layout example.
17–19
20
LX
BST
Switching Node. Connect LX pins to the switching side of the inductor. Refer to the MAX17545 EV kit
manual 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 MAX17545 EV kit manual
for a layout example.
Pin Configuration
VCC
SGND
EN/UVLO
RT
SYNC
CF
FB
SS
5V LDO
MAX17545
1.215V
OSCILLATOR
CURRENT-SENSE
LOGIC
HICCUP
PWM/
PFM/
HICCUP
LOGIC
AND
DRIVERS
ERROR AMPLIFIER/
LOOP COMPENSATION
MODE
SELECTION
LOGIC
VCC
SWITCHOVER VBG = 0.9V
LOGIC
SLOPE
COMPENSATION
5µA
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 MAX17545.PDF ] | |
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