RT9361AGE Richtek USA Inc, RT9361AGE Datasheet - Page 8

• Manufacturer Part Number: RT9361AGE
• Description: IC DC-DC CONV CHRG PUMP SOT23-6
• Manufacturer: Richtek USA Inc

Specifications of RT9361AGE

• Internal Driver: Yes
• Type - Primary: Backlight, Flash/Torch
• Type - Secondary: White LED
• Mounting Type: Surface Mount
• Topology: PWM, Switched Capacitor (Charge Pump)
• Number Of Outputs: 1
• Frequency: 800kHz ~ 1.3MHz
• Voltage - Supply: 2.8 V ~ 5 V
• Voltage - Output: 5V
• Package / Case: SOT-23-6
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

RT9361A/B
Application Information
Capacitor Selection
Careful selection of the three external capacitors C
and C
up time, output ripple and transient performance. Optimum
performance will be obtained when low ESR (<100mΩ)
ceramic capacitors are used for C
In general, low ESR may be defined as less than 100mΩ.
In all cases, X7R or X5R dielectric are recommended. For
particular application, low ESR Tantalum capacitors may
be substituted; however optimum output ripple performance
may not be realized. Aluminum electrolytic capacitors are
not recommended for using with the RT9361A/B due the
their inherent high ESR characteristic.
In general, lower values for C
utilized for light load current applications (<60mA). Drawing
a load current of 60mA or less may use a C
capacitor value as low as 2.2μF and a C
0.22μF. C
to 10μF for heavy output load conditions (<110mA). C
may range from 0.22μF for light loads to 1μF for heavy
output load conditions. If C
also be increased by the same ratio to minimize output
ripple. As a basic rule, the ratio between C
C
C
V
www.richtek.com
8
V
OUT
PUMP
OUT
Figure 1. Application Circuits
IN
+
, but it will increase the output ripple oppositely.
and C
PUMP
should be approximately 10 to 1. Lowering the C
IN
2.2µF
C
is very important because they will affect ramp-
PUMP
IN
and C
value can decrease the ramp-up time of
OUT
CP
VIN
EN
RT9361A/B
C
0.22µF
GND
may range from 1μF for light loads
PUMP
VOUT
PUMP
CN
IN
C
2.2µF
, C
is increased, C
OUT
for Backlight Dimming
IN
OUT
and C
100
LED
20mA 20mA
R
and C
OUT
PUMP
100
LED
R
PUMP
IN
IN
and C
, C
OUT
and C
value of
OUT
IN
may be
should
100
LED
20mA
, C
R
PUMP
PUMP
and
OUT
OUT
IN
.
,
Figure 4. Application Circuits for Doubling the Output
V
V
IN
IN
3.3V
Figure 3. Application Circuits for Constant Load
V
+
Figure 2. Application Circuits for Flash LEDs
IN
+
+
2.2µF
C
10µF
C
IN
10µF
IN
C
IN
CP
VIN
EN
RT9361A/B
CP
VIN
EN
RT9361A/B
C
0.22µF
C
GND
PUMP
C
GND
PUMP
1µF
CP
VIN
EN
CP
VIN
EN
RT9361A/B
RT9361A/B
PUMP
DS9361A/B-12
Current
VOUT
VOUT
C
0.22µF
GND
GND
CN
PUMP
CN
0.22µF
VOUT
VOUT
C
2.2µF
CN
CN
OUT
C
10µF
OUT
LED
1µH
R
L
4.5V/150mA
C
10µF
September 2009
OUT
V
OUT
5V/180mA
LED
R
5V/110mA
1µF
V
V
OUT
OUT
LED
R