MAX769
2 or 3-Cell, Step-Up/Down,
Two-Way Pager System IC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(OUT = 3.0V, BATT = 3.6V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
%-3.5 3.5
OUT Error, Coast Mode
(Note 11)
%
Coast Mode, OUT = 1.8V to 4.9V
-3.5 3.5OUT Error, Run Mode (Note 12)
Circuit of Figure 2, OUT = 3.0V, BATT = 3.0V
Run Mode, OUT = 1.8V to 4.9V
Circuit of Figure 2, OUT = 3.0V, BATT = 3.0V
CONDITIONS
BATT = 1.6V to 4.5V mV25OUT Line Regulation
I
OUT
= 80mA, C
OUT
= 47µF with ESR < 0.25Ω
mVp-p70OUT Voltage Ripple
LX1, LX2, BATT = 3.0V
Ω
0.9 1.8
LX On-Resistance (Note 14)
ns50
ns50
CS to SCL Hold Time (t
CSH
)
CS to SCL Setup Time (t
CSS
)
ns100SDI Setup Time (t
DS
)
NMOS
PMOS 1.3 2.6
T
A
= +25°C, FILT connected to REF kHz210 270 325Frequency, Free-Run
Backup Mode, NICD = 3.3V
f
SYNC
= 38.4kHz
ns100
kHz
CS Pulse Width High (t
CSW
)
268.8
ns70
Frequency, Locked
CS to SDO Disable (t
TR
)
Ω
f
SYNC
= 38.4kHz, FILT Network = 1nF
(22nF + 10kΩ)
kHz±15Jitter (Note 15)
5 10
f
SYNC
= 38.4kHz, FILT Network = 1nF
(22nF + 10kΩ)
ms1 25Capture Time (Note 15)
Backup-Regulator
On-Resistance (Note 16)
ns50
0.2V < (OUT - NICD) < 2V, 15mA_CHG = 1
SCL Pulse Width High or Low
(t
CH
, t
CL
)
mA
mA80 115
7 25
Output Current, Run Mode
(Note 10)
mA15 40
Current High
Output Current, Coast Mode
(Note 10)
UNITSMIN TYP MAXPARAMETER
0.2V < (OUT - NICD) < 2V, 1mA_CHG = 1 mA0.45 1.5Current Low
OUT = 2.8V, I
OUT
= 20mA, NICD = 3.3V %-3.5 3.5OUT Error, Backup Regulator
50% duty cycle MHz5SCL Maximum Clock Rate
OUT = 3.0V %76 83Maximum LX Duty Cycle
During the inductor charge cycle mA300 350 400LX Switch Current Limit
ns70
ns70
CS to SDO Output Valid (t
DV
)
SCL to SDO Output Valid (t
DO
)
ns50SDI Hold Time (t
DH
)
I
OUT
= 1mA to 80mA, Run Mode mV25OUT Load Regulation
Coast or Run Mode, OUT = 1.8V to 4.9V mV30 100 170OUT DAC Step Size (Note 13)
SERIAL-INTERFACE TIMING SPECIFICATIONS (Note 9)
DC-DC CONVERTER
PHASE-LOCKED LOOP (PLL)
NICD CHARGER
(28 páginas)
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