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3-644861-1

P1-P3P4-P6P7-P9P10-P12
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 3.6V, SHDN = BATT, C
REF
= 0.1µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN MAX
UNITS
FB Input Current MAX1927R 150 nA
Reference Voltage Accuracy
1.22 1.269
V
Reference-Supply Rejection 2.6V < V
BATT
< 5.5V 2 mV
PWM CONTROLLER
V
BATT
= 3.6V 0.4
P-Channel On-Resistance
V
BATT
= 2.6V 0.5
Ω
V
BATT
= 3.6V
0.30
N-Channel On-Resistance
V
BATT
= 2.6V
0.35
Ω
P-Channel Current-Limit Threshold 1.1
0.10
1.6 A
P-Channel Pulse-Skipping Current Threshold
0.10 0.16
A
LX Leakage Current V
BATT
= 5.5V, LX = GND or BATT -20
+20
µA
Maximum Duty Cycle
100
%
Minimum Duty Cycle PWM = GND 0 %
Internal Oscillator Frequency 0.8 1.2
MHz
POK COMPARATOR
BATT Operating Voltage Range I
POK
= 0.1 mA 1 5.5 V
Output Low Voltage V
FB
= 0.5V, I
POK
= 1mA 0.1 V
Output High Leakage Current V
POK
= 5.5V 1 µA
MAX1927R
0.650 0.700
MAX1928-15
1.305 1.395
MAX1928-18
1.566 1.674
POK Threshold
MAX1928-25
2.175 2.325
V
Output Valid to POK Release Delay
POK transitions to high impedance 20ms
after V
FB
> V
POK
15 25 ms
LOGIC INPUTS (SHDN, PWM)
Logic Input High 2.6V < V
BATT
< 5.5 V 1.6 V
Logic Input Low 2.6V < V
BATT
< 5.5 V 0.6 V
Logic Input Current V
BATT
= 5.5V 1 µA
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
_______________________________________________________________________________________ 5
MAX1927 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
10010
50
60
70
80
90
100
40
1 1000
MAX1927R
EFFICIENCY vs. LOAD CURRENT
V
IN
= 5V
V
IN
= 3.6V
V
OUT
= 3.3V
MAX1928-25
EFFICIENCY vs. LOAD CURRENT
MAX1927 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
10010
50
60
70
80
90
100
40
1 1000
V
IN
= 5V
V
IN
= 3.6V
MAX1928-18
EFFICIENCY vs. LOAD CURRENT
MAX1927 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
10010
40
50
60
70
80
90
100
30
1 1000
V
IN
= 5V
V
IN
= 2.7V
V
IN
= 3.6V
V
OUT
= 1.8V
MAX1928-15
EFFICIENCY vs. LOAD CURRENT
MAX1927 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
10010
40
50
60
70
80
90
100
30
1 1000
V
OUT
= 1.5V
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 5V
MAX1927R
EFFICIENCY vs. LOAD CURRENT
MAX1927 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
10010
40
50
60
70
80
90
100
30
1 1000
V
OUT
= 1V
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 5V
MAX1928-25
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX1927 toc06
LOAD CURRENT (A)
DROPOUT VOLTAGE (mV)
0.90.80.6 0.70.2 0.3 0.4 0.50.1
50
100
150
200
250
300
350
400
450
500
0
0 1.0
V
IN
= 2.5V
MAX1928-18
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1927 toc07
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
900800600 700200 300 400 500100
1.72
1.74
1.76
1.78
1.80
1.82
1.84
1.86
1.88
1.90
1.70
0 1000
V
IN
= 3.6V
MAX1927 toc08
INPUT VOLTAGE (V)
INPUT CURRENT (µA)
5.04.50.5 1.0 1.5 2.5 3.0 3.52.0 4.0
50
100
150
200
250
300
350
400
0
0 5.5
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE
OSCILLATOR FREQUENCY
vs. INPUT VOLTAGE
MAX1927 toc09
INPUT VOLTAGE (V)
OSCILLATOR FREQUENCY (MHz)
5.14.64.13.63.1
0.96
0.98
1.00
1.02
1.04
1.06
0.94
2.6 5.6
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
Typical Operating Characteristics
(Circuits of Figure 3 and 4, T
A
= +25°C, unless otherwise noted.)
MAX1927/MAX1928
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuits of Figure 3 and 4, T
A
= +25°C, unless otherwise noted.)
MAX1927 toc10
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (A)
5.14.64.13.63.1
0.2
0.4
0.6
0.8
1.0
1.2
1.4
V
OUT
= 1.8V
V
OUT
= 2.5V
V
OUT
= 1V
0
2.6 5.6
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
STARTUP WAVEFORM
MAX1927 toc11
1ms/div
5V/div
1V/div
200mA/div
SHDN
V
OUT
I
IN
POK WAVEFORM
MAX1927 toc12
20ms/div
5V/div
2V/div
2V/div
SHDN
V
OUT
POK
HEAVY-LOAD SWITCHING WAVEFORMS
MAX1927 toc13
400ns/div
10mV/div
200mA/div
5V/div
V
OUT
(AC-COUPLED)
I
L
LX
LIGHT-LOAD SWITCHING WAVEFORMS
MAX1927 toc14
2ms/div
10mV/div
200mA/div
5V/div
V
OUT
(AC-COUPLED)
I
L
LX
LOAD TRANSIENT
MAX1927 toc15
100µs/div
100mV/div
250mA
900mA
500mA/div
V
OUT
(AC-COUPLED)
I
LOAD
LINE TRANSIENT
MAX1927 toc16
1ms/div
10mV/div
2V/div
4.2V
3V
V
OUT
(AC-COUPLED)
V
IN
P1-P3P4-P6P7-P9P10-P12

3-644861-1

Mfr. #:
Buy 3-644861-1
Manufacturer:
TE Connectivity
Description:
Headers & Wire Housings 11P MTA100 SHRD HDR,W/O PEG SN
Lifecycle:
New from this manufacturer.
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