BQ24640 Datasheet, PDF (7/25 Pages) Texas Instruments – High-Efficiency Synchronous Switch-Mode Super Capacitor Charger

bq24640
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SLUSA44 – MARCH 2010
ELECTRICAL CHARACTERISTICS (continued)
5.0 V ≤ V(VCC) ≤28 V, 0°C < T < +125°C, typical values are at T_A = 25°C, with respect to GND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
INTERNAL SOFT START (8 steps to regulation current ICHG)
Soft start steps
8
step
Soft start step time
1.6
ms
LOGIC IO PIN CHARACTERISTICS (CE, STAT, PG)
V_{IN_LO}
V_{IN_HI}
V_{BIAS_CE}
CE input low threshold voltage
CE input high threshold voltage
2.1
CE input bias current
V_CE = 3.3V (CE has internal 1MΩ pulldown
resistor)
0.8 V
6 mA
V_{OUT_LO}
STAT, PG output low saturation
voltage
Sink current = 5 mA
0.5 V
I_{OUT_HI}
Leakage current
V = 32V
1.2 mA
vertical spacer
vertical spacer
TYPICAL CHARACTERISTICS
Table 1. Table of Graphs
Power Up (VREF, REGN, PG)
Charge Enable and Disable
Current Soft Start (CE=HIGH)
Continuous Conduction Mode Switching Waveform
Discontinuous Conduction Mode Switching Waveform
Charge Profile
FIGURES
Figure 2
Figure 3
Figure 4
Figure 6
Figure 7
Figure 8
VCC
VREF
STAT
PG
Figure 2. Power Up
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