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MAX1954AEUB+
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
MAX1954A
Low-Cost, Curr
ent-Mode PWM Buck
Contr
oller with Foldback Curr
ent Limit
4
_______________________________________________________________________________________
Note 1:
HSD and IN are externally connected for applications where HSD < 5.5V.
Note 2:
Specifications to -40
°
C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5V, V
BST
- V
LX
= 5V,
T
A
= -40
°
C to +85
°
C
, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
Current-Sense Amplifier
Voltage Gain
3.15
3.85
V/V
V
FB
= 0.8V
110
145
Current-Limit Threshold
V
PGND
- V
LX
, MAX1954A
V
FB
= 0V
21
51
mV
OSCILLATOR
Switching Frequency
240
360
kHz
Maximum Duty Cycle
Measured at DH
89
93
%
Minimum Duty Cycle
V
COMP
= 1.25V, LX = GND, V
BST
= V
IN
= 3.3V
3
%
FET DRIVERS
DH, DL Output Low Voltage
I
SINK
= 10mA
0.1
V
DH, DL Output High Voltage
I
SOURCE
= 10mA
V
IN
-
0.1V
or
V
BS
T
-
0.1V
V
DH Pullup/Pulldown,
DL Pullup On-Resistance
3
Ω
DL Pulldown On-Resistance
2
Ω
LX, BST, HSD Leakage Current
V
BST
= 18.7V, V
LX
= 13.2V, V
IN
= 5.5V, V
HSD
= 13.2V
30
µA
SHUTDOWN CONTROL
COMP Logic-Level Low
3V < V
IN
< 5.5V
0.25
V
COMP Logic-Level High
3V < V
IN
< 5.5V
0.8
V
COMP Pullup Current
100
µA
MAX1954A
Low-Cost, Curr
ent-Mode PWM Buck
Contr
oller with Foldback Curr
ent Limit
_______________________________________________________________________________________
5
T
ypical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
EFFICIENCY
vs. LOAD CURRENT
MAX1954A toc01
LOAD CURRENT (A)
EFFICIENCY (%)
100
40
50
60
70
80
90
0.1
1
10
V
OUT
= 2.5V
V
IN
= V
HSD
= 5V
V
OUT
= 1.5V
2.60
2.55
2.50
2.45
2.40
02
1
345
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1954A toc02
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
V
IN
= V
HSD
= 5V
-70
-30
-50
10
-10
50
30
70
3.0
4.0
3.5
4.5
5.0
5.5
OUTPUT VOLTAGE CHANGE
vs. INPUT VOLTAGE
MAX1954A toc03
INPUT VOLTAGE (V)
CHANGE IN OUTPUT VOLTAGE (mV)
V
OUT
= 2.5V
V
OUT
= 0.8V
V
IN
= V
HSD
I
OUT
= 5A
0.81
0.81
0.80
0.80
0.79
10.8
12.0
11.4
12.6
13.2
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX1954A toc04
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
V
IN
= V
HSD
I
OUT
= 5A
250
270
310
290
330
350
3.0
4.0
3.5
4.5
5.0
5.5
OSCILLATOR FREQUENCY
vs. INPUT VOLTAGE
MAX1954A toc05
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (kHz)
T
A
= -40
°
C
T
A
= +85
°
C
T
A
= +25
°
C
V
IN
= V
HSD
LOAD TRANSIENT
MAX1954A toc06
40
µ
s/div
100mV/div
V
OUT
AC-COUPLED
I
OUT
5A/
µ
s
5A
500mA
MAX1954A
Low-Cost, Curr
ent-Mode PWM Buck
Contr
oller with Foldback Curr
ent Limit
6
_______________________________________________________________________________________
T
ypical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
LOAD TRANSIENT
MAX1954A toc07
40
µ
s/div
100mV/div
V
OUT
AC-COUPLED
I
OUT
5A/
µ
s
5A
2.5A
NO-LOAD SWITCHING WAVEFORMS
MAX1954A toc08
2
µ
s/div
2A/div
I
L
DH
LX
DL
5V/div
10V/div
5V/div
HEAVY-LOAD SWITCHING WAVEFORMS
I
LOAD
= 5A
MAX1954A toc09
2
µ
s/div
2A/div
I
L
DH
LX
DL
5V/div
10V/div
5V/div
SHORT CIRCUIT AND RECOVERY
MAX1954A toc11
200
µ
s/div
1V/div
V
OUT
V
IN
I
LX
5A/div
2V/div
I
IN
2A/div
POWER-UP/POWER-DOWN WAVEFORMS
MAX1954A toc10
4ms/div
5V/div
V
IN
V
OUT
I
LX
5A/div
2V/div
STARTUP INTO PREBIASED OUTPUT
(OUTPUT PREBIASED AT ~1.7V)
MAX1954A toc12
2ms/div
1V/div
V
OUT
V
IN
DL
5V/div
5V/div
DH
5V/div
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
MAX1954AEUB+
Mfr. #:
Buy MAX1954AEUB+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Current-Mode PWM Buck Controller
Lifecycle:
New from this manufacturer.
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