MAX8505 MAXIM [Maxim Integrated Products], MAX8505 Datasheet - Page 4

• Manufacturer Part Number: MAX8505
• Description: 3A, 1MHz, 1% Accurate, Internal Switch Step-Down Regulator with Power-OK
• Manufacturer: MAXIM [Maxim Integrated Products]

3A, 1MHz, 1% Accurate, Internal Switch
Step-Down Regulator with Power-OK
ELECTRICAL CHARACTERISTICS
(V
4
IN AND V
IN Voltage Range
V
IN Supply Current
V
Total Shutdown Current into IN
and V
V
Threshold
REF
REF Voltage
REF Shutdown Resistance
REF Soft-Start Current
FB
FB Regulation Voltage
FB Input Bias Current
Maximum Output Current
FB Threshold for POK Transition
COMP
COMP Transconductance
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 C ur r ent- S ense Tr ansr esi stance
LX Current-Limit Threshold
LX Leakage Current
LX Switching Frequency
LX Minimum Off-Time
IN
CC
CC
CC
_______________________________________________________________________________________
= V
Voltage Range
Supply Current
Undervoltage Lockout
CC
CC
CC
PARAMETER
= V
CTL
= +3.3V, V
FB
= 0.8V, V
SYMBOL
I
OUT_MAX
UVLO
I
V
SHDN
V
V
I
I
R
CC
REF
IN
FB
COMP
IN
T
th
= 1.25V, C
Switching with no load
Switching with no load
V
V
When LX starts/stops
switching
I
From REF to GND, V
V
V
V
V
L = 1µH/5.9mΩ (Note 1)
FB rising or falling
From FB to COMP
V
V
From COMP to GND, V
V
V
From LX to COMP
Sourcing, Typical Application Circuit
Sinking, V
V
V
V
3.3V, 5.5V
V
REF
IN
LX
REF
IN
FB
IN
IN
IN
IN
IN
IN
CTL
IN
IN
= 2.6V to 5.5V
= V
= V
= V
= V
= V
= V
= V
= V
= V
= 0
= 0.7V
= 0µA, V
= 0.4V
= 0
CC
CC
CC
CC
BST
BST
CC
CC
CC
REF
IN
= 3.3V, V
= 2.6V, 3.3V, 5.5V, V
= 2.6V, 3.3V, 5.5V, V
= 2.6V,
= V
= 5.5V,
= 2.6V, 3.3V, 5.5V
- V
- V
= V
IN
= 0.01µF, T
BST
LX
LX
CONDITIONS
= V
CC
= 3.3V
= 3.3V
- V
CC
= 2.6V to 5.5V
OUT
CTL
LX
= 2.6V to 5.5V
CTL
= 5.5V, V
= 1.2V,
= 0V
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
= 0V
V
V
V
V
FB high
FB low
LX = 5.5V
LX = 0V
CTL = V
CTL = 2/3
IN
CC
CC
CC
= 3.3V
FB
FB
= 3.3V
rising
falling
CTL
= 0.9V
= 0.7V
CC
= 0V,
✕
V
CC
0.791
0.791
0.068
-13.5
-100
MIN
2.25
10.5
0.45
0.85
0.44
-4.3
2.6
2.2
1.7
4.6
20
60
95
3
TYP
1.15
0.56
135
0.808
0.808
0.104
MAX
-10.5
-1.0
2.55
13.5
1.00
100
V
100
160
100
5.6
5.5
0.1
2.1
10
10
50
30
74
74
CC
UNITS
MHz
mΩ
mΩ
mA
mA
µA
µA
µA
µS
µA
ns
%
Ω
Ω
Ω
V
V
V
V
V
A
V
V
A