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MAX8505 PDF даташит

Спецификация MAX8505 изготовлена ​​​​«Maxim Integrated» и имеет функцию, называемую «Step-Down Regulator».

Детали детали

Номер произв MAX8505
Описание Step-Down Regulator
Производители Maxim Integrated
логотип Maxim Integrated логотип 

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MAX8505 Даташит, Описание, Даташиты
19-2992; Rev 1; 9/10
EVAALVUAAILTAIOBNLEKIT
16-QSOP 3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
m x 4.9m
General Description
The MAX8505 step-down regulator operates from a 2.6V
to 5.5V input and generates an adjustable output voltage
from 0.8V to 0.85  VIN at up to 3A. With a 2.6V to 5.5V
bias supply, the input voltage can be as low as 2.25V.
The MAX8505 integrates power MOSFETs and
operates at 1MHz/500kHz switching frequency to
provide a compact design. Current-mode pulse-width-
modulated (PWM) control simplifies compensation with
ceramic or polymer output capacitors and provides
excellent transient response.
The MAX8505 features 1% accurate output over load,
line, and temperature variations. Adjustable soft-start is
achieved with an external capacitor. During the
soft-start period, the voltage-regulation loop is active.
This limits the voltage dip when the active devices,
such as microprocessors or ASICs connected to the
MAX8505’s output, apply a sudden load current step
upon passing their undervoltage thresholds.
The MAX8505 features current-limit, short-circuit, and
thermal-overload protection and enables a rugged
design. Open-drain power-OK (POK) monitors the
output voltage.
Features
o Saves Space—4.9mm x 6mm Footprint, 1µH
Inductor, 47µF Ceramic Output Capacitor
o Input Voltage Range
2.6V to 5.5V
Down to 2.25V with Bias Supply
o 0.8V to 0.85  VIN, 3A Output
o Ceramic or Polymer Capacitors
o ±1% Output Accuracy Over Load, Line, and
Temperature
o Fast Transient Response
o Adjustable Soft-Start
o In-Regulation Soft-Start Limits Output-Voltage
Dips at Power-On
o POK Monitors Output Voltage
Ordering Information
Applications
µP/ASIC/DSP/FPGA Core and I/O Supplies
Chipset Supplies
Server, RAID, and Storage Systems
Network and Telecom Equipment
PART
TEMP RANGE PIN-PACKAGE
MAX8505EEE+
-40°C to +85°C 16 QSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Functional Diagram appears at end of data sheet.
Pin Configuration
Typical Operating Circuit
TOP VIEW
LX 1
IN 2
LX 3
IN 4
BST 5
VCC 6
POK 7
CTL 8
MAX8505
QSOP
16 LX
15 PGND
14 LX
13 PGND
12 GND
11 REF
10 FB
9 COMP
INPUT
2.6V TO 5.5V
ENABLE
POWER-OK
BST
IN
LX
MAX8505
PGND
VCC
FB
COMP
CTL
REF
POK
GND
OUTPUT
0.8V TO
0.85 x VIN
3A
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.









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MAX8505 Даташит, Описание, Даташиты
3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
ABSOLUTE MAXIMUM RATINGS
CTL, FB, IN, VCC to GND .........................................-0.3V to +6V
COMP, REF, POK to GND ..........................-0.3V to (VCC + 0.3V)
BST to LX..................................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 12.5mW/°C above +70°C).......1000mW
Operating Temperature Range
MAX8505EEE...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+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.
ELECTRICAL CHARACTERISTICS
(VIN = VCC = VCTL = +3.3V, VFB = 0.8V, VCOMP = 1.25V, CREF = 0.01µF, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
IN AND VCC
IN Voltage Range
VCC Voltage Range
IN Supply Current
VCC Supply Current
Total Shutdown Current into IN
and VCC
VCC Undervoltage Lockout
Threshold
REF
REF Voltage
REF Shutdown Resistance
REF Soft-Start Current
Soft-Start Ramp Time
SYMBOL
CONDITIONS
MIN TYP MAX
VIN
VCC
IIN
ICC
ISHDN
UVLOth
Switching with no load
VIN = 3.3V
VIN = 5.5V
Switching with no load
VCC = 3.3V
VCC = 5.5V
VIN = VCC = VBST - VLX = 5.5V, VCTL = 0V,
VLX = 0V
When LX starts/stops
switching
VCC rising
VCC falling
2.25
2.6
2.2
6
10
3
6
20
2.40
2.35
VCC
5.5
10
10
50
2.55
VREF
IREF = 0µA, VIN = VCC = 2.6V to 5.5V
From REF to GND, VCTL = 0V
VREF = 0.4V
Output from 0% to 100%, CREF = 0.01µF to
1µF
0.792
20
0.800
13
25
0.808
100
30
32
FB
FB Regulation Voltage
FB Input Bias Current
Maximum Output Current
FB Threshold for POK Transition
FB to POK Delay
COMP
COMP Transconductance
Gain from FB to COMP
IOUT_MAX
VIN = 2.6V to 5.5V
VFB = 0.7V
VIN = VCC = 3.3V, VOUT = 1.2V,
L = 1µH/5.9m(Note 1)
FB rising or falling
FB high
FB low
FB rising or falling
From FB to COMP
VCOMP = 1.25V to 1.75V
0.792 0.800 0.808
0.01 0.1
3
10.5 12 13.5
-13.5 -12 -10.5
50
60 100 160
80
UNITS
V
V
mA
mA
µA
V
V
µA
ms/µF
V
µA
A
%
µs
µS
dB
2 _______________________________________________________________________________________









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MAX8505 Даташит, Описание, Даташиты
3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VCC = VCTL = +3.3V, VFB = 0.8V, VCOMP = 1.25V, CREF = 0.01µF, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
SYMBOL
COMP Clamp Voltage, Low
COMP Clamp Voltage, High
COMP Shutdown Resistance
LX (All LX Outputs Connected Together)
LX On-Resistance, High
LX On-Resistance, Low
LX Current-Sense Transresistance
LX Current-Limit Threshold
RT
LX Leakage Current
LX Switching Frequency
LX Minimum Off-Time
LX Maximum Duty Cycle
LX Minimum Duty Cycle
SLOPE COMPENSATION
Slope Compensation
BST
BST Shutdown Supply Current
CTL
CTL Input Threshold
CTL Input Current
POK (Power-OK)
POK Output Voltage, Low
POK Leakage Current
POK Fault Delay Time
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
CONDITIONS
VIN = VCC = 2.6V, 3.3V, 5.5V, VFB = 0.9V
VIN = VCC = 2.6V, 3.3V, 5.5V, VFB = 0.7V
From COMP to GND, VCTL = 0V
VIN = VBST - VLX = 3.3V
VIN = VBST - VLX = 2.6V
VIN = VBST - VLX = 3.3V
VIN = VBST - VLX = 2.6V
From LX to COMP
Sourcing, Typical Application Circuit
Sinking, VIN = VCC = 2.6V to 5.5V
VIN = VCC = 5.5V,
VCTL = 0V
VLX = 5.5V
VLX = 0V
VIN = VCC = 2.6V, 3.3V, VCTL = VCC
5.5V
VCTL = 2/3VCC
VIN = VCC = 2.6V, 3.3V, 5.5V
VIN = VCC = 2.6V, 3.3V, 500kHz
5.5V
1MHz
VIN = VCC = 2.6V, 3.3V, 500kHz
5.5V
1MHz
Extrapolated to 100% duty cycle
(VBST - VLX) = VIN =
VCC = 5.5V, VCTL = 0V
VLX = 5.5V
VLX = 0V
LX open
VIN = VCC = 2.6V,
3.3V, 5.5V
For 1MHz
For 500kHz
For shutdown
VCTL = 0V or 5.5V, VIN = VCC = 5.5V
VFB = 0.6V or 1.0V, IPOK = 2mA
VPOK = 5.5V
From FB to POK, any threshold
When LX stops switching TJ rising
MIN
0.45
1.7
TYP
0.75
1.9
13
MAX
1.00
2.1
100
0.068
4.6
-4.3
-100
0.85
0.44
95
90
84
38
42
38
42
0.086
5.6
-2.6
1
0.5
110
94
89
5
10
74
74
0.104
6.6
-1.0
100
1.15
0.56
135
8
15
245 300 400
10
10
10
80
55 70
45
-1 +1
25 100
0.001
1
25 50 100
+170
20
UNITS
V
V
m
m
A
µA
MHz
ns
%
%
mV
µA
% of
VCC
µA
mV
µA
µs
°C
°C
_______________________________________________________________________________________ 3










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