Low-Cost, Multichemistry Battery-
Charger Building Block
MAX172
ELECTRICꢃL CHꢃRꢃCTERISTICS (AVntinued)
ꢀ
(V
= V
= V
= 18V, V
= V
= V
= V
= 12V, V
= 3.0V, V
= 1µF, LDO = DLOV, C
= V
= 0.75
REF
V
, V
= 2.0V,
CELLS
DCIN
CSSP
CSSN
BATT
- V = 4.5V, V
CSIP
CSIN
REFIN
VCTL
ICTL
REFIN
V
= 0V, CLS = REF, V
= 0V, C
= 1µF; pins CCI, CCS, and CCV
ACIN
BST
LX
GND
PGND
LDO
are compensated per Figure 1a; T = ±°C tV +8.°C, unless otherwise noted. Typical values are at T = +25°C.)
ꢃ
A
PꢃRꢃMETER
Maximum On-Time
SYMBꢀL
CꢀNDITIꢀNS
MIN
TYP
MꢃX
15
ꢄNITS
ms
kHz
µA
µA
µA
µA
%
5
10
f
Oscillator Frequency
(Note 2)
DLO low
DHI high
400
10
OSC
I
DLOV Supply Current
BST Supply Current
5
6
DLOV
I
15
BST
V
V
= 28V, V
= V = 20V
BATT LX
LX Input Bias Current
150
0.3
99.9
4
500
1.0
DCIN
DCIN
= 0V, V
= V = 20V
LX
LX Input Quiescent Current
DHI Maximum Duty Cycle
DHI On-Resistance High
DHI On-Resistance Low
DLO On-Resistance High
DLO On-Resistance Low
BATT
99.0
V
V
V
V
V
V
V
V
V
V
- V = 4.5V, I = +100mA
DHI
7
2
Ω
BST
BST
LX
- V = 4.5V, I = -100mA
DHI
1
Ω
LX
= 4.5V, I
= +100mA
= -100mA
= 0V
4
7
Ω
DLOV
DLOV
BATT
BATT
DCIN
DLO
DLO
= 4.5V, I
= 19V, V
1
2
Ω
5
DCIN
I
BATT Input Current
µA
µA
µA
V
BATT
= 2V to 19V, V
> V
+ 0.3V
BATT
200
1
500
5
DCIN
= 0V
CSIP/CSIN Input Current
CSSP/CSSN Input Current
= V
= 12V
= V
800
0.3
800
CSIP
DCIN
CSSP
CSIN
= 0V
= V
0.1
> 8.0V
CSSN
DCIN
BATT/CSIP/CSIN Input Voltage
Range
0
19
CSIP to CSIN Full-Scale
Current-Sense Voltage
V
= 12V
189
189
204
204
219
219
mV
mV
BATT
CSSP to CSSN Full-Scale
Current-Sense Voltage
ERRꢀR ꢃMPLIFIERS
GMV Amplifier
VCTL = REFIN, V
ICTL = REFIN, V
= 16.8V, CELLS = LDO
0.0625
0.5
0.1250
1
0.250
2
µS
µS
BATT
Transconductance
GMI Amplifier
Transconductance
- V
= 150.4mV
= 102.4mV
CSIP
CSIN
GMS Amplifier
Transconductance
V
= 2.048V, V
- V
CSSN
0.5
1
2
µS
CLS
CSSP
0.25V < V , V
, V
< 2.0V
CCI/CCS/CCV Clamp Voltage
150
300
600
mV
CCI CCS CCV
CꢄRRENT ꢃND ꢁꢀLTꢃGE SETTING
ICTL = REFIN (see Equation 2)
-8
-55
-1
+8
+55
+1
Charging-Current Accuracy
%
µA
V
ICTL = REFIN/32 (see Equation 2)
V
V
= V
= V
REFIN
= 3V
= V
VCTL
DCIN
ICTL
ICTL, VCTL, REFIN Input Bias
Current
= 0, V
= V
= 5V
REFIN
-1
+1
VCTL
ICTL
ICTL Power-Down Mode
Threshold Voltage
REFIN
/100
REFIN
/55
REFIN
/33
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3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
