Datasheet

VCC
VREF
STAT
PG
bq24640
www.ti.com 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
CE input low threshold voltage 0.8 V
V
IN_HI
CE input high threshold voltage 2.1
V
CE
= 3.3V (CE has internal 1MΩ pulldown
V
BIAS_CE
CE input bias current 6 mA
resistor)
STAT, PG output low saturation
V
OUT_LO
Sink current = 5 mA 0.5 V
voltage
I
OUT_HI
Leakage current V = 32V 1.2 mA
vertical spacer
vertical spacer
TYPICAL CHARACTERISTICS
Table 1. Table of Graphs
FIGURES
Power Up (VREF, REGN, PG) Figure 2
Charge Enable and Disable Figure 3
Current Soft Start (CE=HIGH) Figure 4
Continuous Conduction Mode Switching Waveform Figure 6
Discontinuous Conduction Mode Switching Waveform Figure 7
Charge Profile Figure 8
Figure 2. Power Up
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