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MAX8505 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # MAX8505
Description  3A, 1MHz, 1% Accurate, Internal Switch Step-Down Regulator with Power-OK
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8505 Datasheet(HTML) 5 Page - Maxim Integrated Products

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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 VOUT = output voltage; ILIM = current limit of high-side switch; tS = switching period; RL = ESR of inductor; RNLS =
on-resistance of low-side switch; L = inductor. Equations for ILIM and D are shown as follows:
where ILIM_DC100 = current limit at D = 100%; RT = transresistance from LX to COMP; VSW = slope compensation (310mV
±20%); D = duty cycle:
where VOUT = output voltage; VIN = input voltage; IO = output current; RL = ESR of inductor; RNHS = on-resistance of high-
side switch; RNLS = 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 3.5ARMS current.
D
VI
R
R
VI
R
R
OUT
O
NLS
L
IN
O
NLS
NHS
=
++
+−
()
()
II
V
D
R
LIM
LIM DC
SW
T
=+
_
100
1
I
ID
t
V
L
Dt
R
R
L
OUT MAX
LIM
S
OUT
S
NLS
L
_
()
/
()
(
) /
=
−− × ×
+− × ×
+
12
11
2
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VCC = VCTL = +3.3V, VFB = 0.8V, VCOMP = 1.25V, CREF = 0.01µF, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
500kHz
90
LX Maximum Duty Cycle
VIN = VCC = 2.6V, 3.3V,
5.5V
1MHz
84
%
500kHz
8
LX Minimum Duty Cycle
VIN = VCC = 2.6V, 3.3V,
5.5V
1MHz
15
%
SLOPE COMPENSATION
Slope Compensation
Extrapolated to 100% duty cycle
245
406
mV
BST
VLX = 5.5V
10
VLX = 0V
10
BST Shutdown Supply Current
(VBST - VLX) = VIN =
VCC = 5.5V, VCTL = 0
LX open
10
µA
CTL
For 1MHz
80
For 500kHz
55
70
CTL Input Threshold
VIN = VCC = 2.6V,
3.3V, 5.5V
For shutdown
45
% of
VCC
CTL Input Current
VCTL = 0V or 5.5V, VIN = VCC = 5.5V
-1
+1
µA
POK (Power-OK)
POK Output Voltage, Low
VFB = 0.6V or 1.0V, IPOK = 2mA
100
mV
POK Leakage Current
VPOK = 5.5V
1
µA
POK Fault Delay Time
From FB to POK, any threshold
25
100
µs


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