RT9451_17 Datasheet, PDF (11/37 Pages) Richtek Technology Corporation – Switch-Mode Single Cell Li-ion Battery Charger

Typical Operating Characteristics
Charge Mode
Efficiency vs. Battery Voltage
100
95
90
85
ICHRG = 1A
ICHRG = 1.4A
80
ICHRG = 1.8A
ICHRG = 2.2A
75
ICHRG = 2.6A
ICHRG = 3A
70
65
VIN = 5V
60
3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2
Battery Voltage (V)
Adapter Insertion
RT9451
Efficiency vs. Battery Voltage
100
95
90
85
ICHRG = 1A
80
ICHRG = 1.4A
ICHRG = 1.8A
75
ICHRG = 2.2A
ICHRG = 2.6A
70
ICHRG = 3A
65
VIN = 9V
60
3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2
Battery Voltage (V)
Battery Removal
VIN
(5V/Div)
STAT
(2V/Div)
LX
(10V/Div)
IIN
(200mA/Div)
VIN = 5V, VBAT = 3.7V
Time (10ms/Div)
STAT
(2V/Div)
LX
(5V/Div)
VBAT
(1V/Div)
ILX
(1A/Div)
VIN = 5V, VBAT = 3.7V, TERM_EN = 1
Time (5ms/Div)
Bad Adapter
VIN
(5V/Div)
INT
(5V/Div)
IIN
(20mA/Div)
VIN = 5V/10mA, VBAT = 3.7V
Time (10ms/Div)
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS9451-01 March 2017
Minimum Input Voltage Regulation
No AICR
INT
(5V/Div)
VIN
(2V/Div)
IIN
(1A/Div)
VIN = 5V/1A, ICHRG = 2A,
VMIVR = 4.76V, VBAT = 3.7V
Time (250μs/Div)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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