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PDF MAX17546 Data sheet ( Hoja de datos )
| Número de pieza | MAX17546 | |
| Descripción | Synchronous Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX17546
4.5V–42V, 5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
General Description
The MAX17546 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated high-side
MOSFET operates over a 4.5V to 42V input. The
converter can deliver up to 5A and generates output
voltages from 0.9V up to 0.9 x VIN. The feedback (FB)
voltage is accurate to within ±1.4% over -40°C to 125°C.
The MAX17546 uses peak current-mode control. The
device can be operated in the pulse-width modulation
(PWM), pulse-frequency modulation (PFM), and
discontinuous conduction mode (DCM) control schemes.
The device is available in a 20-pin (5mm x 5mm) Thin
QFN (TQFN) package. Simulation models are available.
Applications
● Industrial Power Supplies
● Distributed Supply Regulation
● Base Station Power Supplies
● Wall Transformer Regulation
● High-Voltage Single-Board Systems
● General-Purpose Point-of-Load
Ordering Information appears at end of data sheet.
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
● Reduce 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 > 95%
• PFM/DCM Modes Enable Enhanced Light-Load
Efficiency
• Auxiliary Bootstrap LDO for Improved Efficiency
• 3.5FA Shutdown Current
● Operates Reliably in Adverse Industrial Environments
• Hiccup or Latchoff Mode Overload Protection
• DL to LX Short Detection Feature
• Built-In Output Voltage Monitoring with RESET
• Programmable EN/UVLO Threshold
• Monotonic Startup into Prebiased Load
• Overtemperature Protection
• -40NC to +125NC Operation
Typical Application Circuit for 5V Output
VIN
7.5V-42V
C6
2.2μF
EN/UVLO VIN VIN VIN VIN
RT BST
MODE /SYNC
VCC LX
SGND
CF
RESET
MAX17546
LX
LX
DL
C11
0.1μ F
SS PGND EXTVCC FB
C1
2.2μF
C2
2.2μF
L1
4.7μH
C8
N1 22μ F
C9
22μF
C7
0.022μ F
C10
22μF
FSW = 450kHz
VOUT
5V, 5A
R3
158 k
R4
34.8k
L1 = XAL8080-472
N1 = RJK0651DPB
19-7665; Rev 0; 6/15
1 page  
MAX17546
4.5V–42V, 5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
Typical Operating Characteristics
(VIN = VEN/UVLO = 24V, VPGND = VSGND = 0V, CVIN = 2 x 2.2µF, CVCC = 2.2µF, CBST = 0.1µF, CSS = 22,000pF, RT = MODE/SYNC
= open, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to SGND,
unless otherwise noted.)
5V OUTPUT, PWM MODE,
EFFICIENCY vs. LOAD CURRENT
FIGURE 3 CIRCUIT
100
3.3V OUTPUT, PWM MODE,
EFFICIENCY vs. LOAD CURRENT
100 FIGURE 4 CIRCUIT
5V OUTPUT, PFM MODE,
EFFICIENCY vs. LOAD CURRENT
100 FIGURE 3 CIRCUIT
90
80
VIN = 36V
VIN = 24V
70
VIN = 12V
60
50
40
0
MODE = SGND
123
LOAD CURRENT (A)
4
5
90
80
70
60
50
40
0
VIN = 24V VIN = 36V
VIN = 12V
MODE = SGND
123
LOAD CURRENT (A)
4
5
95
90
85
80
75
1
VIN = 36V
VIN = 12V VIN = 24V
MODE = OPEN
10 100 1000
LOAD CURRENT (mA)
5000
100
95
90
85
80
75
70
65
60
55
1
3.3V OUTPUT, PFM MODE,
EFFICIENCY vs. LOAD CURRENT
FIGURE 4 CIRCUIT
VIN = 24V
VIN = 36V
VIN = 12V
MODE = OPEN
10 100 1000
LOAD CURRENT (mA)
5000
3.3V OUTPUT, DCM MODE,
EFFICIENCY vs. LOAD CURRENT
100 FIGURE 4 CIRCUIT
90
VIN = 36V
80
VIN = 24V
70
VIN = 12V
60
50
40
30
1
MODE = VCC
10 100 1000
LOAD CURRENT (mA)
5000
5V OUTPUT, DCM MODE,
EFFICIENCY vs. LOAD CURRENT
100 FIGURE 3 CIRCUIT
90 VIN = 36V
VIN = 24V
80
VIN = 12V
70
60
50
40
30
1
MODE = VCC
10 100 1000
LOAD CURRENT (mA)
5000
5V OUTPUT, PWM MODE,
LOAD AND LINE REGULATION
5.05 FIGURE 3 CIRCUIT
5.04
5.03
5.02
5.01 VIN = 24V
5.00
4.99
4.98
4.97 VIN = 12V
4.96
VIN = 36V
4.95
0
123
LOAD CURRENT (A)
4
5
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17546
4.5V–42V, 5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
Pin Description (continued)
PIN
12
13
16
17, 18, 19
20
—
NAME
FUNCTION
SS Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start time.
EN/UVLO
BST
Enable/Undervoltage Lockout. Drive EN/UVLO high to enable the output voltage. Connect to the center
of the resistor-divider between VIN and SGND to set the input voltage at which the MAX17546 turns on.
Pull up to VIN for always on operation.
Boost Flying Capacitor. Connect a 0.1µF ceramic capacitor between BST and LX.
LX Switching Node. Connect LX pins to the switching side of the inductor.
Use DL pin to drive the gate of the low-side external n-MOSFET. A resistor connected between the DL
DL pin and SGND selects the overload protection method and the peak and runaway current limits. See the
Overcurrent Protection/HICCUP Mode section for more details.
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 MAX17546 Evaluation Kit
datasheet for a layout example.
Block Diagram
VCC
EXTVCC
EN/UVLO
RT
CF
FB
LDO
SELECT
MAX17546
1.215 V
CURRENT SENSE
LOGIC
HICCUP
OSCILLATOR
ERROR AMPLIFIER/
LOOP COMPENSATION
PWM/
PFM/
HICCUP LOGIC
VCC
MODE SELECTION
LOGIC
BST
VIN_
LX_
DL
PGND
MODE /SYNC
SS
SGND
SWITCHOVER LOGIC
VCC
VBG = 0.9V
5μA
HICCUP
SLOPE COMPENSATION
FB
EN/UVLO
RESET LOGIC
RESET
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX17546.PDF ] | |
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