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PDF RT9535A Data sheet ( Hoja de datos )
| Número de pieza | RT9535A | |
| Descripción | High Efficiency Switching Mode Battery Charger | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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RT9535A
High Efficiency Switching Mode Battery Charger
General Description
The RT9535A is a PWM switch mode battery charger
controller to fast charge single or multiple Li-Ion, NiMH
and NiCd batteries, using constant current or constant
voltage control. Maximum current can be easily
programmed by external resistor. The constant voltage
output can support up to 22V with 0.5% accuracy.
A third control loop limits the input current drawing from
the adapter during charging. This allows simultaneous
operation of the equipment and fast battery charging
without over loading to the adapter.
The RT9535A can charge batteries from 2.5V to 22V
with dropout voltage as low as 0.4V.
The RT9535A is available in the WQFN-16L 4X4
package.
Features
Fast Charging for Li-Ion, NiMH and NiCd Batteries
Adjustable Battery Voltages from 2.5V to 22V
High Efficiency : Up to 95%
Charging Current Programmed by Resistor
Precision 0.5% Charging Voltage Accuracy
Provide 5% Charging Current Accuracy
500kHz Switching Frequency
Auto Shutdown with Adapter Removal
Applications
Notebook Computers
Portable Instruments
Chargers for Li-lon, NiMH, NiCd and Lead Acid
Rechargeable Batteries
Simplified Application Circuit
D4
VIN
C1
R2
R1
CIN
HSD
EN RT9535A
VIN V5V
R3
R4 R5
C3 C4
C5
VFB
VHH
ISET
VC
SS
GND
VFB
VHH
NTC
BOOT
SW
PGND
SNSH
SNSL
BATT
C2
D2 D3
To RS3
VHH
R7 C6
C7
R6 RNTC
R8
D1
C8 L1 RS1
RS3 RS2
CBATT
RF2
RF1
VBATT
To VFB
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9535A-03 June 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Operation
The RT9535A is a current mode PWM step-down
switching charger controller. The battery DC charge
current is programmed by a resistor R4 at the ISET pin
and the ratio of sense resistor RS2 over RS1 in the
typical application circuit. Amplifier CA converts the
charge current through RS1 to a much lower sampled
current ICHG (ICHG = IBATT x RS1 / RS2) fed into the
ISET pin. Amplifier EA compares the output of CA with
2.5V reference voltage and drives the PWM loop to
force them to be equal. Note that ICHG has both AC and
DC components. High DC accuracy is achieved with
averaging filter R3 and C3 at ISET pin. ICHG is mirrored
to go through R4 and generates a ramp signal that is
fed to the PWM control comparator, forming the current
mode inner loop. An internal LDO generates a 5V to
power high-side MOSFET gate driver. For batteries like
lithium that require both constant current and constant
voltage charging, the 0.5% 2.5V reference and the
voltage amplifier VA reduce the charge current when
battery voltage reaches the normal charge voltage level.
For NiMH and NiCd, VA can be used for over-voltage
protection.
RT9535A
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9535A-03 June 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT9535A
110
108
106
104
102
100
98
96
94
92
90
-50
VICHG vs. Temperature
VIN = 4.5V
VIN = 12V
VIN = 28V
-25 0 25 50 75 100 125
Temperature (°C)
Switching Frequency vs. Supply Voltage
510
505
500
495
490
485
480
0
5 10 15 20 25 30
Supply Voltage (V)
Charge Enable and Disable
VFB Voltage vs. Temperature
2.55
2.53
2.51
2.49
2.47
2.45
-50 -25
VIN = 4.5V
VIN = 12V
VIN = 28V
0 25 50 75 100 125
Temperature (°C)
BATT Bias Current vs.Temperature
14
12
10
8
6
4
2
0
-50
-25
0 25 50 75 100 125
Temperature (℃)
Adapter Insert and Remove
VBATT
(2V/Div)
SW-GND
(10V/Div)
EN
(2V/Div)
IBATT
(500mA/Div)
VIN = 12V, VBATT = 4V, IBATT = 1A
Time (25ms/Div)
VBATT
(2V/Div)
SW-GND
(10V/Div)
VIN
(5V/Div)
IBATT
(500mA/Div)
VIN = 12V, VBATT = 4V, IBATT = 1A
Time (25ms/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9535A-03 June 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet RT9535A.PDF ] | |
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