MAX1820/MAX1821
WCDMA Cellular Phone 600mA
Buck Regulators
_______________________________________________________________________________________ 5
Note 2: Limits are 100% production tested at T
A
= +25°C for UCSP parts. Limits over the entire operating temperature range are
guaranteed by design and characterization but are not production tested.
Note 3: Specifications to -40°C are guaranteed by design and not subject to production test.
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
LX Leakage Current I
LX
V
BATT
= 5.5V, LX = GND or BATT -1 1 µA
Maximum Duty Cycle duty
MAX
100 %
SKIP = GND 0
Minimum Duty Cycle duty
MIN
SKIP = BATT, V
BATT
= 4.2V 10
%
SYNC AND OSCILLATOR
S Y N C = si ne w ave, S Y N C i np ut = 200m V
P-P
13 13
SYNC Divide Ratio
(MAX1820X)
S Y N C = si ne w ave, S Y N C i np ut = 800m V
P-P
13 13
Hz/Hz
SYNC Capture Range
(MAX1820X)
SYNC = sine wave, AC-coupled,
SYNC input = 500mV
P-P
10 16 MHz
S Y N C = si ne w ave, S Y N C i np ut = 200m V
P-P
18
18
SYNC Divide Ratio
(MAX1820Y)
S Y N C = si ne w ave, S Y N C i np ut = 800m V
P-P
18
18
Hz/Hz
SYNC Capture Range
(MAX1820Y)
SYNC = sine wave, AC-coupled,
SYNC input = 500mV
P-P
15 21 MHz
V
SYNC
= IV ( M AX 1820Z , M AX 1821) -1
+1
SYNC Leakage Current I
SYNC
V
SYNC
= IV ( M AX 1820X , M AX 1820Y , and
M AX 1821X )
-5 +5
µA
Internal Oscillator Frequency
(MAX1820Z, MAX1821)
f
OSC
SYNC = GND 0.8 1.2 MHz
LOGIC INPUTS (SKIP, SHDN)
Logic Input High V
IH
1.6 V
Logic Input Low V
IL
0.4 V
Logic Input Current 1µA
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= 3.6V, SHDN = BATT, SKIP = SYNC = GND, V
REF
= 1.25V (MAX1820 only), T
A
= -40°C to +85°C, unless otherwise noted.)
(Notes 2, 3)
40
50
60
70
80
90
100
0 1.00.5 1.5 2.0 2.5 3.0 3.5 4.0
EFFICIENCY vs. OUTPUT VOLTAGE
(NORMAL MODE, V
IN
= 3.6V)
MAX1820/21 toc01
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
R
LOAD
= 10Ω
R
LOAD
= 15Ω
R
LOAD
= 5Ω
40
50
60
70
80
90
100
0 1.00.5 1.5 2.0 2.5 3.0 3.5 4.0
EFFICIENCY vs. OUTPUT VOLTAGE
(PWM MODE, V
IN
= 3.6V)
MAX1820/21 toc02
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
R
LOAD
= 10Ω
R
LOAD
= 15Ω
R
LOAD
= 5Ω
0
20
10
40
30
60
50
70
90
80
100
2.0 3.0 3.52.5 4.0 4.5 5.0 5.5 6.0
MAX1820/21 toc03
V
IN
(V)
EFFICIENCY (%)
EFFICIENCY vs. INPUT VOLTAGE
NORMAL MODE, R
LOAD
= 10Ω
V
OUT
= 1.8V
V
OUT
= 3.4V
V
OUT
= 0.4V
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
(36 páginas)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentários a estes Manuais