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MAX8505EEE+

P1-P3P4-P6P7-P9P10-P12P13-P15
MAX8505
3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CC
= V
CTL
= +3.3V, V
FB
= 0.8V, V
COMP
= 1.25V, C
REF
= 0.01µF, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IN AND V
CC
IN Voltage Range V
IN
2.25 V
CC
V
V
CC
Voltage Range 2.6 5.5 V
IN Supply Current I
IN
Switching with no load V
IN
= 3.3V
10 mA
V
CC
Supply Current I
CC
Switching with no load V
CC
= 3.3V
10 mA
Total Shutdown Current into IN
and V
CC
I
SHDN
V
IN
= V
CC
= V
BST
- V
LX
= 5.5V, V
CTL
= 0V,
V
LX
= 0V
50 µA
V
CC
rising 2.55
V
CC
Undervoltage Lockout
Threshold
UVLO
th
When LX starts/stops
switching
V
CC
falling 2.2
V
REF
REF Voltage V
REF
I
REF
= 0µA, V
IN
= V
CC
= 2.6V to 5.5V 0.791 0.808 V
REF Shutdown Resistance From REF to GND, V
CTL
= 0V 100 Ω
REF Soft-Start Current V
REF
= 0.4V 20 30 µA
FB
FB Regulation Voltage V
FB
V
IN
= 2.6V to 5.5V 0.791 0.808 V
FB Input Bias Current V
FB
= 0.7V 0.1 µA
Maximum Output Current I
OUT_MAX
V
IN
= V
CC
= 3.3V, V
OUT
= 1.2V,
L = 1µH/5.9mΩ (Note 1)
3A
FB high 10.5 13.5
FB Threshold for POK Transition FB rising or falling
FB low -13.5 -10.5
%
COMP
COMP Transconductance From FB to COMP 60 160 µS
COMP Clamp Voltage, Low V
IN
= V
CC
= 2.6V, 3.3V, 5.5V, V
FB
= 0.9V 0.45 1.00 V
COMP Clamp Voltage, High V
IN
= V
CC
= 2.6V, 3.3V, 5.5V, V
FB
= 0.7V 1.7 2.1 V
COMP Shutdown Resistance From COMP to GND, V
CTL
= 0V 100 Ω
LX (All LX Outputs Connected Together)
LX On-Resistance, High
V
IN
= V
BST
- V
LX
= 3.3V
74 mΩ
LX On-Resistance, Low
V
IN
= V
BST
- V
LX
= 3.3V
74 mΩ
LX C ur r ent- S ense Tr ansr esi stance R
T
From LX to COMP 0.068 0.104 Ω
Sourcing, Typical Application Circuit
4.6 5.6
LX Current-Limit Threshold
Sinking, V
IN
= V
CC
= 2.6V to 5.5V -4.3 -1.0
A
V
LX
= 5.5V 100
LX Leakage Current
V
IN
= V
CC
= 5.5V,
V
CTL
= 0V
V
LX
= 0V -100
µA
V
CTL
= V
CC
0.85
1.15
LX Switching Frequency
V
IN
= V
CC
= 2.6V,
3.3V, 5.5V
V
C TL
= 2/3 ✕ V
C C
0.44
0.56
MHz
LX Minimum Off-Time V
IN
= V
CC
= 2.6V, 3.3V, 5.5V 95 135 ns
MAX8505
3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
_______________________________________________________________________________________ 5
Note 1: Under normal operating conditions, COMP moves between 1.25V and 2.15V as the duty cycle changes from 10% to 90%
and peak inductor current changes from 0 to 3A. Maximum output current is related to peak inductor current, inductor value
input voltage, and output voltage by the following equations:
where V
OUT
= output voltage; I
LIM
= current limit of high-side switch; t
S
= switching period; R
L
= ESR of inductor; R
NLS
=
on-resistance of low-side switch; L = inductor. Equations for I
LIM
and D are shown as follows:
where I
LIM_DC100
= current limit at D = 100%; R
T
= transresistance from LX to COMP; V
SW
= slope compensation (310mV
±20%); D = duty cycle:
where V
OUT
= output voltage; V
IN
= input voltage; I
O
= output current; R
L
= ESR of inductor; R
NHS
= on-resistance of high-
side switch; R
NLS
= on-resistance of low-side switch. See the
Typical Application Circuit
for external components.
Note 2: Specifications to -40°C are guaranteed by design and not production tested.
Note 3: LX has internal clamp diodes to PGND and IN pins 2 and 4. Applications that forward bias these diodes should take care
not to exceed the IC’s package power dissipation limits.
Note 4: When connected together, the LX output is designed to provide 3.5A
RMS
current.
D
VIRR
VIR R
OUT O NLS L
IN O NLS NHS
=
++
+−
()
()
II V
D
R
LIM LIM DC SW
T
=+
−
_ 100
1
I
IDtVL
Dt R R L
OUT MAX
LIM S OUT
S NLS L
_
() /
() ( )/
=
−− × ×
+− × × +
12
11 2
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
CC
= V
CTL
= +3.3V, V
FB
= 0.8V, V
COMP
= 1.25V, C
REF
= 0.01µF, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
500kHz 90
LX Maximum Duty Cycle
V
IN
= V
CC
= 2.6V, 3.3V,
5.5V
1MHz 84
%
500kHz 8
LX Minimum Duty Cycle
V
IN
= V
CC
= 2.6V, 3.3V,
5.5V
1MHz 15
%
SLOPE COMPENSATION
Slope Compensation Extrapolated to 100% duty cycle 245 406 mV
BST
V
LX
= 5.5V
10
V
LX
= 0V 10
BST Shutdown Supply Current
(V
BST
- V
LX
) = V
IN
=
V
CC
= 5.5V, V
CTL
= 0V
LX open 10
µA
CTL
For 1MHz 80
For 500kHz 55 70
CTL Input Threshold
V
IN
= V
CC
= 2.6V,
3.3V, 5.5V
For shutdown 45
% of
V
CC
CTL Input Current V
CTL
= 0V or 5.5V, V
IN
= V
CC
= 5.5V -1 +1 µA
POK (Power-OK)
POK Output Voltage, Low V
FB
= 0.6V or 1.0V, I
POK
= 2mA 100 mV
POK Leakage Current V
POK
= 5.5V 1 µA
POK Fault Delay Time From FB to POK, any threshold 25 100 µs
MAX8505
3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
6 _______________________________________________________________________________________
Typical Operating Characteristics
(Typical values are at V
IN
= V
CC
= V
CTL
= 5V, V
OUT
= 1.2V, I
OUT
= 3A, and T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= V
CC
= 5V, f
SW
= 1MHz)
MAX8505 toc01
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 3.3V
B: V
OUT
= 2.5V
C: V
OUT
= 1.2V
D: V
OUT
= 0.8V
A
B
C
D
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= V
CC
= 3.3V, f
SW
= 500kHz)
MAX8505 toc02
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 2.5V
B: V
OUT
= 1.8V
C: V
OUT
= 1.2V
D: V
OUT
= 0.8V
A
B
C
D
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= V
CC
= 3.3V, f
SW
= 1MHz)
MAX8505 toc03
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 2.5V
B: V
OUT
= 1.8V
C: V
OUT
= 1.2V
D: V
OUT
= 0.8V
A
B
C
D
EFFICIENCY vs. OUTPUT CURRENT
(V
IN
= 2.5V, V
CC
= 5V, f
SW
= 1MHz)
MAX8505 toc04
OUTPUT CURRENT (A)
EFFICIENCY (%)
321
60
70
80
90
100
50
04
A: V
OUT
= 1.8V
B: V
OUT
= 1.2V
C: V
OUT
= 0.8V
A
B
C
FREQUENCY vs. INPUT VOLTAGE AND
TEMPERATURE
MAX8505 toc05
INPUT VOLTAGE (V)
FREQUENCY (MHz)
5.04.54.03.53.0
0.97
0.99
1.01
1.03
1.05
0.95
2.5 5.5
+85°C
+25°C
-40°C
FREQUENCY vs. INPUT VOLTAGE AND
TEMPERATURE
MAX8505 toc06
INPUT VOLTAGE (V)
FREQUENCY (kHz)
5.04.54.03.53.0
480
490
500
510
520
530
470
2.5 5.5
+85°C
+25°C
-40°C
OUTPUT LOAD REGULATION
MAX8505 toc07
OUTPUT CURRENT (A)
-∆V
OUT
(mV)
321
1
2
3
4
5
6
0
04
A: V
OUT
= 0.8V
B: V
OUT
= 1.2V
C: V
OUT
= 1.8V
D: V
OUT
= 2.5V
A
B
C
D
V
IN
= V
CC
= 3.3V
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX8505EEE+

Mfr. #:
Buy MAX8505EEE+
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 3A 1MHz Step-Down Regulator
Lifecycle:
New from this manufacturer.
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