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PDF MAX17506 Data sheet ( Hoja de datos )
| Número de pieza | MAX17506 | |
| Descripción | Synchronous Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX17506
4.5V–60V, 5A, High-Efficiency, Synchronous
Step-Down DC-DC Converter
with Internal Compensation
General Description
The MAX17506 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated high-side
MOSFET operates over a 4.5V to 60V 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 MAX17506 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 60V 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 Enables 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-60V
C6
2.2μF
EN/UVLO VIN VIN VIN VIN
RT BST
MODE /SYNC
VCC LX
SGND
CF
RESET
MAX17506
LX
LX
DL
C11
0.1μF
SS PGND EXTVCC FB
C1
2.2μF
C2
2.2μF
L1
4.7μH
C8
N1 22μF
C9
22μF
C7
0.022 μF
C10
22μF
FSW = 450kHz
VOUT
5V, 5A
R3
158 k
R4
34.8k
19-7453; Rev 0; 11/14
1 page  
MAX17506
4.5V–60V, 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
100
FIGURE 3 CIRCUIT
TOC01
3.3V OUTPUT, PWM MODE,
EFFICIENCY vs. LOAD CURRENT
100
FIGURE 4 CIRCUIT
TOC02
5V OUTPUT, PFM MODE,
EFFICIENCY VS. LOAD CURRENT
FIGURE 3 CIRCUIT
TOC03
100
90 90
95
80 VIN = 48V
VIN = 24V
70 VIN = 36V
VIN = 12V
60
50
40
0.00
MODE = SGND
1.00 2.00 3.00 4.00
LOAD CURRENT (A)
5.00
80
70
60
50
40
0.00
VIN = 24V VIN = 36V VIN = 48V
VIN = 12V
MODE = SGND
1.00 2.00 3.00 4.00
LOAD CURRENT (A)
5.00
90
85
80
75
70
1
VIN = 36V
VIN = 24V
VIN = 48V
VIN = 12V
MODE = OPEN
10 100 1000
LOAD CURRENT (mA)
5000
100
95
90
85
80
75
70
65
60
55
50
1
3.3V OUTPUT, PFM MODE,
EFFICIENCY vs. LOAD CURRENT
FIGURE 4 CIRCUIT
TOC04
VIN = 24V
VIN = 48V
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
TOC06
VIN = 48V
90
VIN = 36V
80
VIN = 24V
70
VIN = 12V
60
50
40
30
1
MODE = VCC
10 100 1000
LOAD CURRENT (mA)
5V OUTPUT, DCM MODE,
EFFICIENCY VS. LOAD CURRENT
FIGURE 3 CIRCUIT
TOC05
100
VIN = 48V
90 VIN = 36V
VIN = 24V
80
70 VIN = 12V
60
50
40
30
1
MODE = VCC
10 100 1000
LOAD CURRENT (mA)
5V OUTPUT, PWM MODE,
LOAD AND LINE REGULATION
FIGURE 3 CIRCUIT
TOC07
5.05
5.04
5.03
5.02
5.01
VIN = 24V
VIN = 48V
5.00
4.99
4.98
4.97 VIN = 12V
4.96
4.95
0.00
1.00
VIN = 36V
MODE = SGND
2.00 3.00 4.00
LOAD CURRENT (A)
5.00
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX17506
4.5V–60V, 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 MAX17506 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 MAX17506 Evaluation Kit
datasheet for a layout example.
Block Diagram
VCC
EXTVCC
EN/UVLO
RT
CF
FB
LDO
SELECT
MAX17506
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 MAX17506.PDF ] | |
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