SH3100 Datasheet, PDF (5/80 Pages) Semtech Corporation – Supervisory IC with I2C Interface and PWM

SH3100
POWER MANAGEMENT
Current Consumption
The following table shows the maximum current consumption figures from VDD and VBAK under a number of possible
operating conditions.
Battery Backup Modes
State
Condition
Battery backup 1
Battery backup 2
Crystal oscillator and RTC running from VBAK; VDD is zero
Internal 32.768kHz oscillator and RTC running from VBAK; VDD is zero
MAX VBAK
Current
2μA
12μA
Normal Operating Modes
State
Condition
Standby
Auto-fan mode
Switching
regulator standby
LDO standby
Start-up
Active
Programming
32.768kHz system clock, programmable reset, RTC and logic enabled
Automatic fan mode with 32.768kHz output on CLK0; HFDCO disabled
Switching regulator maintaining 10μA load with occasional active burst to maintain
supply level
Standby but with LDO running on no load
Current consumed during chip startup
Up to 33.5MHz output clock enabled on both CLK0 and CLK1; 20pF load on each
Simultaneous blowing of up to eight fuses
Note: At temperatures above 40°C, the above figures start to
increase due to leakage. Expect +2μA at 60°C, and +6μA at
80°C.
Note: VBAK current in normal operation mode is dependent
on clock feedthrough from CLK0 & CLK1 to VBAK. Under worst-
case conditions with CLK output at 33MHz and VDD = 5.5 V,
VBAK input current could be up to 2μA. At lower frequencies,
VBAK current drops to approximately 50nA. This effect is relat-
ed to the same phenomenon as described in the VBAK protec-
tion section, and the net feedthrough current on to VBAK may
be positive or negative, dependent on VDD and VBAK voltage
levels.
MAX VDD
Current
10μA
15μA
20μA
250μA
1mA
12mA
100mA
© 2006 Semtech Corp.
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