Rainbow Electronics MAX8730 - Manual (Page 13)

MAX8730
Low-Cost Battery Charger
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LDO LINE REGULATION
INPUT VOLTAGE (V)
LDO ERROR (%)
MAX8730 toc22
8 13 18 23 28
-0.400
-0.390
-0.380
-0.370
-0.360
-0.350
-0.395
-0.385
-0.375
-0.365
-0.355
REF ERROR vs. TEMPERATURE
TEMPERATURE ( °C)
REF ERROR (%)
MAX8730 toc24
-40 -20 0 20 40 60 80
-0.35
-0.30
-0.25
-0.20
-0.15
-0.10
-0.05
0
REFERENCE LOAD REGULATION
I REF (
µA)
REF (%)
MAX8730 toc23
0 100 200 300 400 500
-0.25
-0.23
-0.21
-0.19
-0.17
-0.15
-0.13
-0.11
CHARGER DISABLED
SWREF LOAD REGULATION
SWREF OUTPUT CURRENT (mA)
SWREF ERROR (%)
MAX8730 toc25
0 10 20 30 40
-1.5
-1.2
-0.9
-0.6
-0.3
0
SWREF VOLTAGE vs. TEMPERATURE
TEMPERATURE ( °C)
SWREF VOLTAGE (V)
MAX8730 toc26
-40 -20 0 20 40 60 80
3.25
3.26
3.27
3.28
3.29
3.30
3.31
3.32
DISCONTINUOUS MODE
SWITCHING WAVEFORM
MAX8730toc27
0
0
0
20V
LX
DHI
INDUCTOR
CURRENT
20V
1A
1 µs/div
CHARGE
CURRENT = 20mA
Typical Operating Characteristics (continued)
(Circuit of Figure 1, adapter = 19.5V, V BATT = 12V, V ICTL = 2.4V, MODE > 1.8V, REFON = INPON = LDO, V RELTH = V REF /2, T
A
=
+25°C, unless otherwise noted.)