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PDF RT9535B Data sheet ( Hoja de datos )
| Número de pieza | RT9535B | |
| Descripción | High Efficiency Switching Mode Battery Charger | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9535B (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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RT9535B
High Efficiency Switching Mode Battery Charger
General Description
The RT9535B 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 RT9535B can charge batteries from 2.5V to 22V
with dropout voltage as low as 0.4V. A logic output
indicates Li-Ion full charge when current drops to 17%
of the full-scale programmed charge current.
The RT9535B is available in the WQFN-24L 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
Input Current Limit Maximizes Charging Rate
500kHz Switching Frequency
Flag Indicates Li-Ion Charge Completion
Auto Shutdown with Adapter Removal
Only 10A Battery Reverse Current when Idle
Applications
Notebook Computers
Portable Instruments
Chargers for Li-lon, NiMH, NiCd and Lead Acid
Rechargeable Batteries
Simplified Application Circuit
M1 RS4
VIN
CIN
C1 R2
C2
R1
ACN
HSD
RT9535B
ACP
V5V
ACDRV
EN
NTC
R9
RNTC R10
VIN
BOOT
ISET
R3 VC SW
R5 SS
R4
C3
C5 VFB
C4
VFB
PGND
SNSH
SGND
SNSL
D1
VHH
VHH
BATT
STATUS
GND
(Exposed Pad)
C9
To System Power
D2 D3
C7
To VHH Pin
C8 L1
RS1
RS3 RS2
RF2
VBATT
CBATT
To VFB Pin
RF1
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9535B-02 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Operation
The RT9535B 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 topside FET 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.
RT9535B
CL Amplifier
The amplifier CL monitors and limits the input current,
normally from the AC adapter, to a preset level (100mV
/ RS4). At input current limit, CL will supply the
programming current at ISET pin, thus reducing battery
charging current.
Charge STATUS
When the charger is in voltage mode and the charge
current level is reduced to 17%, STATUS pin will turn to
logic high. This charge completion signal can be used
to start a timer for charge termination. A 0.1F
capacitor from STATUS to ground is needed to filter the
sampled charging current ripple.
ACDRV Driver
The ACDRV pin drives an external P-MOSFET to avoid
reverse current from battery to input supply. When
input supply is removed, the RT9535B goes into a low
current, 10A maximum, sleep mode as VIN drops
below the battery voltage.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9535B-02 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT9535B
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.
DS9535B-02 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet RT9535B.PDF ] | |
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