Electrical characteristics (continued) – Rainbow Electronics MAX769 User Manual
Page 3
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
3.5
OUT 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
mV
25
OUT Line Regulation
I
OUT
= 80mA, C
OUT
= 47µF with ESR < 0.25
Ω
mVp-p
70
OUT Voltage Ripple
LX1, LX2, BATT = 3.0V
Ω
0.9
1.8
LX On-Resistance (Note 14)
ns
50
ns
50
CS to SCL Hold Time (t
CSH
)
CS to SCL Setup Time (t
CSS
)
ns
100
SDI Setup Time (t
DS
)
NMOS
PMOS
1.3
2.6
T
A
= +25°C, FILT connected to REF
kHz
210
270
325
Frequency, Free-Run
Backup Mode, NICD = 3.3V
f
SYNC
= 38.4kHz
ns
100
kHz
CS Pulse Width High (t
CSW
)
268.8
ns
70
Frequency, Locked
CS to SDO Disable (t
TR
)
Ω
f
SYNC
= 38.4kHz, FILT Network = 1nF
(22nF + 10k
Ω
)
kHz
±15
Jitter (Note 15)
5
10
f
SYNC
= 38.4kHz, FILT Network = 1nF
(22nF + 10k
Ω
)
ms
1
25
Capture Time (Note 15)
Backup-Regulator
On-Resistance (Note 16)
ns
50
0.2V < (OUT - NICD) < 2V, 15mA_CHG = 1
SCL Pulse Width High or Low
(t
CH
, t
CL
)
mA
mA
80
115
7
25
Output Current, Run Mode
(Note 10)
mA
15
40
Current High
Output Current, Coast Mode
(Note 10)
UNITS
MIN
TYP
MAX
PARAMETER
0.2V < (OUT - NICD) < 2V, 1mA_CHG = 1
mA
0.45
1.5
Current Low
OUT = 2.8V, I
OUT
= 20mA, NICD = 3.3V
%
-3.5
3.5
OUT Error, Backup Regulator
50% duty cycle
MHz
5
SCL Maximum Clock Rate
OUT = 3.0V
%
76
83
Maximum LX Duty Cycle
During the inductor charge cycle
mA
300
350
400
LX Switch Current Limit
ns
70
ns
70
CS to SDO Output Valid (t
DV
)
SCL to SDO Output Valid (t
DO
)
ns
50
SDI Hold Time (t
DH
)
I
OUT
= 1mA to 80mA, Run Mode
mV
25
OUT Load Regulation
Coast or Run Mode, OUT = 1.8V to 4.9V
mV
30
100
170
OUT DAC Step Size (Note 13)
SERIAL-INTERFACE TIMING SPECIFICATIONS
(Note 9)
DC-DC CONVERTER
PHASE-LOCKED LOOP (PLL)
NICD CHARGER