DC-DC Converter. MAX17551 Datasheet

MAX17551 Converter. Datasheet pdf. Equivalent

MAX17551 Datasheet
Recommendation MAX17551 Datasheet
Part MAX17551
Description Synchronous Step-Down DC-DC Converter
Feature MAX17551; MAX17551 60V, 50mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter with 22µA N.
Manufacture Maxim Integrated
Datasheet
Download MAX17551 Datasheet




Maxim Integrated MAX17551
MAX17551
60V, 50mA, Ultra-Small, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
General Description
The MAX17551 high-efficiency, high-voltage, synchronous
step-down DC-DC converter with integrated MOSFETs
operates over a 4V to 60V input. The converter can deliver
up to 50mA 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 MAX17551 uses peak-current-mode control and 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
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Ordering Information appears at end of data sheet.
Benefits and Features
● 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 60V 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 in to Prebiased Load
• Overtemperature Protection
• High Industrial -40°C to +125°C Ambient Operating
Temperature Range / -40°C to +150°C Junction
Temperature Range
Typical Application Circuit—High-Efficiency 5V, 50mA Regulator
VIN
6V TO 60V
CIN
1µF
R3
140k
IN LX
MAX17551
EN/UVLO
SS
GND
VOUT
MODE
RT/SYNC
FB
RESET
L1
330µH
VOUT
5V
COUT
10µF
R4
22.1
C1
0.22µF
R1
261k
R2
49.9k
SWITCHING FREQUENCY = 300kHz
L1 COILCRAFT LPS5030-334M
COUT MURATA 10µF/X7R/6.3V/0805 (GRM21BR70J106K)
CIN MURATA 1µF/X7R/100V/1206 (GRM31CR72A105K)
19-7110; Rev 2; 9/17



Maxim Integrated MAX17551
MAX17551
60V, 50mA, Ultra-Small, High-Efficiency
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
Absolute Maximum Ratings (Note 1)
IN, EN/UVLO, VOUT, RESET to GND.....................-0.3V to 70V
LX to GND....................................................... -0.3V to IN + 0.3V
RT/SYNC, SS, FB, MODE to GND............................-0.3V to 6V
LX Total RMS Current.........................................................±0.8A
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA = +70°C)
TDFN (derate 14.9mW/°C above +70°C) ............... 1188.7mW
µMAX (derate 8.8mW/°C above +70°C)...................707.3mW
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
Package Information
PACKAGE TYPE: 10 TDFN
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
Junction to Case (θJC)
T1032N+1
21-0429
90-0082
67.3°C/W
18.2°C/W
PACKAGE TYPE: 10 µMAX
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
Junction to Case (θJC)
U10+5
21-0061
90-0330
113.1°C/W
42°C/W
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
www.maximintegrated.com
Maxim Integrated 2



Maxim Integrated MAX17551
MAX17551
60V, 50mA, Ultra-Small, High-Efficiency
Synchronous Step-Down DC-DC Converter
with 22µA No-Load Supply Current
Electrical Characteristics
(VIN = 24V, VGND = 0V, VOUT = 3.3V, VFB = 0.85V, VEN/UVLO = 1.5V, RT/SYNC = 191kΩ, LX = SS = MODE = RESET = unconnected;
TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise
noted.) (Note 2)
PARAMETER
INPUT SUPPLY (IN)
Input Voltage Range
Input Shutdown Current
Input Supply Current
EXTERNAL BIAS (VOUT)
VOUT Switchover Threshold
ENABLE/UVLO (EN/UVLO)
EN/UVLO Threshold
EN/UVLO Leakage Current
POWER MOSFETs
High-Side pMOS On-Resistance
Low-Side nMOS On-Resistance
LX Leakage Current
SOFT-START (SS)
Soft-Start Time
SS Charging Current
FEEDBACK (FB)
FB Regulation Voltage
FB Input Leakage Current
CURRENT LIMIT
Peak Current-Limit Threshold
Negative Current-Limit
Threshold
PFM Current Level
OSCILLATOR (RT/SYNC)
Switching Frequency
SYMBOL
VIN
IIN-SH
IQ-PFM
IQ-PWM
VENR
VENF
VEN-TRUESD
IEN
RDS-ONH
RDS-ONL
ILX-LKG
tSS
ISS
VFB-REG
IFB
IPEAK-LIMIT
ISINK-LIMIT
IPFM
fSW
CONDITIONS
VEN/UVLO = 0V, TA = +25°C
VMODE = unconnected (Note 3)
Normal switching mode, VIN = 24V
VEN/UVLO rising
VEN/UVLO falling
VEN/UVLO falling, true shutdown
VEN/UVLO = 1.3V, TA = +25°C
ILX = 0.1A (sourcing)
ILX = 0.1A (sinking)
VEN = 0V, TA = +25°C,
VLX = (VGND + 1V) to (VIN - 1V)
SS = unconnected
VSS = 0.4V
MODE = GND
MODE = unconnected
VFB = 1V, TA = 25°C
VMODE = GND
VMODE = unconnected
VMODE = unconnected
RRT = 422kΩ
RRT = 191kΩ
RRT = 130kΩ
RRT = 69.8kΩ
RRT = 45.3kΩ
RRT = 19.1kΩ
MIN TYP MAX UNITS
4 60
0.67 1.2 2.25
18 32
180 485 650
V
µA
2.96
3.05
3.12
V
1.2
1.1
-100
1.25
1.15
0.7
1.3
1.2
+100
V
nA
2.7
1.25
-1
5.0
2.5
9.5
5
+1
Ω
Ω
µA
4.4 5.1 5.8
4.7 5 5.3
ms
µA
0.786
0.786
-100
0.8
0.812
0.814
0.826
+100
97 110 123
33 50 66
0.01
28 39 47
V
nA
mA
mA
mA
90 100 111
205 220 235
295 319 340 kHz
540 592 638
813 900 973
1.86
2.08
2.3
MHz
www.maximintegrated.com
Maxim Integrated 3







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)