Page 1
Charge pump for White LED
RN5T653
Development Specifications
Rev. 1.8
2009/05/12
RICOH COMPANY, LTD.
Electronic Devices Company
This specification is subject to change without notice.
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RN5T653 CHARGE PUMP FOR WHITE LED
Table of Contents
1.
Outline........................................................................................................................................................................2
2. Feature .......................................................................................................................................................................2
3. Ordering Information ...............................................................................................................................................2
4. Pin Configuration......................................................................................................................................................3
5. Typical Application Circuit ......................................................................................................................................4
6. Pin Description ..........................................................................................................................................................5
7. Functional Blocks......................................................................................................................................................6
7.1 Regulators ........................................................................................................................................................... 6
7.1.1 Linear Regulators Table (Ordering Table) ................................................................................................ 6
7.2 LDO1/2 Electrical Characteristics ......................................................................................................................7
7.3 Charge Pump.......................................................................................................................................................8
7.3.1 Block Diagram ..........................................................................................................................................8
7.3.2 Backlight LED........................................................................................................................................... 9
7.3.3 Protection Circuit .................................................................................................................................... 10
7.3.4 Unused DIN_ pin ....................................................................................................................................10
7.3.5 Soft-start.................................................................................................................................................. 10
7.3.6 Luminance Control.................................................................................................................................. 11
7.3.7 PWM Adjustment with Time Control .....................................................................................................12
7.3.8 Charge Pump Electrical Characteristics .................................................................................................. 16
7.4 UVLO (Under Voltage Lock Out)....................................................................................................................16
7.5 Thermal Shut-down Circuit ..............................................................................................................................17
7.5.1 Thermal Shut-down Electrical Characteristics........................................................................................ 17
8. Electrical Characteristics........................................................................................................................................18
8.1 Absolute Maximum Ratings .............................................................................................................................18
8.2 Recommendation of Operation Conditions.......................................................................................................18
8.3 DC Characteristics ............................................................................................................................................18
8.4 General Characteristics .....................................................................................................................................18
9. Package Information...............................................................................................................................................19
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RN5T653 CHARGE PUMP FOR WHITE LED
1. Outline
RN5T653 contains a constant frequency charge pump, which is optimized for White LED application. Output
enable/disable, LEDs current and LDOs output voltage are individually controllable through single wire serial pulse I/F.
2. Feature
z White LED Charge Pump
9 Current capability: Up to 80mA
9 1x/1.5x switchable charge pump mode
9 Power up four LEDs for backlight: Up to 20mA/LED
9 Luminance control through 16-logarithmic scale
9 Soft-start
z Power Supply Function
9 LDO (150mA) × 2 (ON/OFF through single wire serial pulse I/F)
9 Over current protection (All Regulators) and thermal shut-down
z Others
9 UVLO
9 Short-circuit protection
z Package
9 20pin QFN package (Body size: 3.0 x 3.0mm, Pin pitch 0.4mm)
z Process
9 CMOS process
3. Ordering Information
RN5T653□ -- □ : S, T, U, V.
LDO1 LDO2 LED Luminance
RN5T653S 1.8V 2.8V Type-A
RN5T653T 1.5V 2.8V Type-A
RN5T653U 1.8V 2.8V Type-B
RN5T653V 1.5V 2.8V Type-B
LED Luminance
LED Luminance
Type-A Type-B
OFF⇒ON(20.3mA)
19.8mA 19.8mA 1
18.8mA 18.8mA 2
17.8mA 17.8mA 3
16.8mA 16.8mA 4
16.0mA 15.5mA 5
12.8mA 13.0mA 6
10.3mA 10.0mA 7
9.0mA 9.0mA 8
8.0mA 6.8mA 9
6.3mA 5.0mA 10
5.0mA 3.3mA 11
4.5mA 2.0mA 12
4.0mA 1.0mA 13
3.3mA 0.5mA 14
0% 15
Count Value
0
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RN5T653 CHARGE PUMP FOR WHITE LED
4. Pin Configuration
DIN2
DIN3
DIN4
C2P
VOUT
DIN1
GND1
19
20
1
2
3
TOP VIEW
4
5
6
7
C1P
C1M
GND2
18
8
VREF
17
9
C2M
LDOUT1
16
10
GNDP
15
14
13
12
11
VCCVIN2
LDOUT2
LEDCTL
LDO2CTL
LDO1CTL
VCCVIN1
Fig 4-1 Pin Configuration
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RN5T653 CHARGE PUMP FOR WHITE LED
5. Typical Application Circuit
1.0uF
1.0uF
1.0uF
VCCVIN2
VREF
LDOUT1
LDOUT2
GND2
LDO1CTL
LDO2CTL
LEDCTL
VREF
LDO1
Charge Pump
@80mA
LDO2
Digital
Thermal Shut-down
UVLO
CC Driver (Main)
Fig 5-1 Typical Application Circuit
VCCVIN1
C2P
1uF
C2M
C1P
1uF
C1M
VOUT
2.2uF
PGND1
DIN1
@20mA
DIN2
@20mA
DIN3
@20mA
DIN4
@20mA
GND1
4.7uF
GND
GND
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RN5T653 CHARGE PUMP FOR WHITE LED
6. Pin Description
No. Name I/O Description Notes
1
2
3
4
5
6
7
8 VCCVIN1 PWR
9
10
11
12
13
14
15
16
17
18
19
20
DIN2
DIN3
DIN4
C2P
VOUT
C1P
C1M
C2M
GNDP
LDO1CTL
LDO2CTL
LEDCTL
LDOUT2
VCCVIN2
LDOUT1
VREF
GND2
GND1 GND
DIN1
O LED driver current control output
O LED driver current control output
O LED driver current control output
- Charge pump boost capacitor connection
O LED driver voltage output
- Charge pump boost capacitor connection
- Charge pump boost capacitor connection
- Charge pump boost capacitor connection
GND Power Ground 1
I Input of LDO1 for ON/OFF.
I Input of LDO2 for ON/OFF.
I Input of LED for ON/OFF and current setting.
O Output of LDO2
PWR Power supply for LDO, UVLO, VREF and TSHUT.
O Output of LDO1.
O Output of voltage reference. Please do not connect anything. No load
GND Ground2
O LED driver current control output
Power supply for charge pump. VCCVIN1 is high impedance
during shut-down.
Ground1
Table 6-1 Pin Description
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RN5T653 CHARGE PUMP FOR WHITE LED
7. Functional Blocks
7.1 Regulators
RN5T653 has 2 Low Drop Output regulators, LDO1 and LDO2. (See Table 6-1)
On/Off operation of each LDO are controllable with LDO1/2CTL pin through single wire serial pulse I/F.
LDO1CTL
LDO2CTL
LDOUT1
LDOUT2
0V
0V
Initial>
100us
RN5T653S,U:1.8V
RN5T653T,V:1.5V
tOFF
4~ 6.5ms
0V
2.8V
0V
Fig 7-1 LDO Output Voltage Control
For the type of the bypass capacitor, it must be a ceramic type, not tantalum type, since the optimization design is based
on the ceramic type for the phase compensation.
・t
: 4~6.5 ms or more “L” of LDO1/2CTL pin turns off LDO1/2.
OFF
7.1.1 Linear Regulators Table (Ordering Table)
RN5T653S, U
LDO1 LDO2
Output Voltage 1.8 2.8
Initial State OFF OFF
ON/OFF Control
Single wire serial pulse I/F
RN5T653T, V
LDO1 LDO2
Output Voltage 1.5 2.8
Initial State OFF OFF
ON/OFF Control
Single wire serial pulse I/F
Table 7-1 Linear Regulators Table
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RN5T653 CHARGE PUMP FOR WHITE LED
7.2 LDO1/2 Electrical Characteristics
Unless otherwise specified, VCCVIN=3.6V, Ta=25℃, Cout=1.0uF
Symbol Parameter Condition Min Typ Max Units
VOUT Output Voltage
VOUT+0.5V≦V
50uA＜IOUT＜150mA
(VCCVIN)≦4.5V
BATT
IOUT Output Current - 150 mA
ILIM Current Limit VOUT=0V 200 250 350 mA
VDRP Drop-out Voltage IOUT=150mA,Ta =85℃,VOUT≧2.8V 200 mV
ΔVOUT
ΔVCCVIN
ΔVOUT
ΔIOUT
ΔVOUT
ΔT
a
Line Regulation
Load Regulation 50uA＜IOUT＜150mA 25 30 mV
Output Voltage
Temperature
Coefficient
RR Ripple Rejection
EN
Output Noise
(RMS)
VOUT+0.5V≦V
BATT
IOUT=150mA
-40℃≦T
f=10Hz-10kHz, C
IOUT=75mA
BW=100Hz-100kHz, C
IOUT=75mA
(VCCVIN)≦4.5V
≦85℃ +100 ppm/℃
a
=1.0uF
out
=1.0uF
out
BC Bypass Capacitor 0uA＜IOUT＜150mA 1.0 uF
ISS Supply Current
Normal (IOUT=0mA) 30 50 70
OFF 1
RN5T653S, U
POUT Output Voltage IOUT=150mA
RN5T653T, V
Note*: For optimized phase compensation, the bypass capacitor must be a ceramic type.
Note*1: LDOUT1 Output Voltage.
Note*2: LDOUT2 Output Voltage.
-2% +2% V
2.4 14 mV
60 dB
35
uVrms
uA
*1
1.8
*2
2.8
-2%
1.5
2.8
+2% V
*1
*2
Table 7-2 LDO1/2 Electrical Characteristics
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RN5T653 CHARGE PUMP FOR WHITE LED
7.3 Charge Pump
RN5T653 drives up to 4 white LEDs with regulated constant current. Utilizing 1x/1.5x charge pump modes achieves
high-efficiency. On/off of LED is individually controllable through single wire serial pulse I/F. Also, the luminance of
LED is individually controllable through single wire serial pulse I/F.
The capacitor is highly recommended to be ceramics.
7.3.1 Block Diagram
4.7uF
VCCVIN1
GND
LEDCTL
1uF
C1M
Logic
C2M
C1P
Charge Pump
@80mA
Adjust Voltage
CC Driver
1uF
Feed Back
C2P
VOUT
2.2uF
PGND1
DIN1
@20mA
DIN2
@20mA
DIN3
@20mA
DIN4
@20mA
GND1
GND
Fig 7-2 Charge Pump Circuit Diagram
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RN5T653 CHARGE PUMP FOR WHITE LED
7.3.2 Backlight LED
For maximized power efficiency, the charge pump operates 1x mode and 1.5x mode, where the operation mode is
determined by comparing the forward voltage of each LED with the input voltage.
Initial and 1x mode
When any LED channel is enabled and VCCVIN1 voltage is greater than the charge pump output (VOUT), the charge
pump initially starts in 1x mode and VOUT is pulled up to VCCVIN1. During start-up, built-in Soft-start circuitry will
prevent excessive inrush current.
In 1x mode, the following relation is the condition to stay in 1x mode.
VOUT - Vf ＞ 220mV (1)
VOUT: Charge pump output
Vf: White LED forward voltage
220mV: Mode transition threshold voltage when LED output current is set at 20mA.
1x or 1.5x transition
When VCCVIN1 falls and DIN_ pin voltage drops lower than the mode transition threshold voltage 220mV for 100us,
the charge pump circuit switches to 1.5x mode to boost voltage.
In 1x mode, the following relation is the transition condition to change to 1.5x mode.
VOUT - Vf ≦ 220mV (2)
Every 1sec, the charge pump circuit resets to 1x mode and stays in 1x mode for approximately 100us to judge whether
it changes to 1.5x mode or stay in 1x mode.
Mode transition
Reset to 1x mode
every sec
Initial
LED channel enabled
VOUT soft-start
VOUT pulled up to VIN1
1x Mode, LED On
Min. DIN_ lower than 220mV.
1.5x Mode
VOUT = GND
VOUT = VIN-Ro*Iled
DIN_=VOUT-Vf
VOUT = 1.5*VIN-Ro*Iled
DIN_=VOUT-Vf
Ro = Output Resistance
Fig 7-3 Mode Transition Diagram
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RN5T653 CHARGE PUMP FOR WHITE LED
7.3.3 Protection Circuit
When any DIN_ pin is floating or grounded, VOUT voltage is limited below protection voltage by gating on/off charge
pump. In case that any LED fails as an open circuit, VOUT voltage is also limited. Besides, when VOUT is smaller than
approximately 1.2V, Charge pump will stop.
7.3.4 Unused DIN_ pin
Please ground unused DIN_ pin to avoid over-voltage protection status.
4.7uF
VCCVIN1
GND
LEDCTL
C1M
1uF
Logic
1uF
C1P
C2M
Charge Pump
@80mA
Feed Back
Adjust Voltage
CC Driver
Fig 7-4 Unused DIN_ pin
C2P
VOUT
2.2uF
PGND1
DIN1
@20mA
DIN2
@20mA
DIN3
@20mA
DIN4
@20mA
GND1
GND
GND
7.3.5 Soft-start
RN5T653 includes Soft-start circuitry to prevent excessive inrush current during turn on. (The internal resistance
gradually increases just after LEDs enabled.)
When the charge pump turns on, the capacitors are charged directly from input voltage.
Soft-start time is less than 300 us, and it is decided by the amount of the external capacitors.
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RN5T653 CHARGE PUMP FOR WHITE LED
7.3.6 Luminance Control
RN5T653 charge pump drives 4 LEDs with regulated constant current for uniformed intensity. LEDCTL input is
used to enable, disable and adjust the current for each with a 16-logarithmic scale.
t
2.4us to 250 us
LEDCTL
I
LED
Soft-start
INITIAL tHI> 300us
12 34 5
20.3mA
19.8mA
LO
18.8mA
17.8mA
16.8mA
16.0mA
tHI> 2.4us
6
12.8mA
78
10.3mA
9.0mA
>
300us t
11
10
9
8.0mA
6.3mA
5.0mA
12
13 14 15 16
4.5mA
4.0mA
20.3mA
3.3mA
0mA
Fig 7-5 Luminance Control Diagram
・t
: Pulling LEDCTL pin to “H” for 300 us or more enables LED. The minimum “H” time of LEDCTL pin is 2.4 us.
HI
・ t
: 4~6.5 ms or more “L” of LEDCTL pin turns off LED.
OFF
Luminance
653S, T 653U, V
OFF⇒ON(20.3mA)
Count value
0
19.8mA 19.8mA 1
18.8mA 18.8mA 2
17.8mA 17.8mA 3
16.8mA 16.8mA 4
16.0mA 15.5mA 5
12.8mA 13.0mA 6
10.3mA 10.0mA 7
9.0mA 9.0mA 8
8.0mA 6.8mA 9
6.3mA 5.0mA 10
5.0mA 3.3mA 11
4.5mA 2.0mA 12
4.0mA 1.0mA 13
3.3mA 0.5mA 14
0mA 15
Table 7-3 LED Luminance Control
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RN5T653 CHARGE PUMP FOR WHITE LED
7.3.7 PWM Adjustment with Time Control
When LEDCTL goes high, LEDs are enabled at the maximum luminance. After subsequent low going pulse reduces
LED current in logarithmical scale.
7.3.7.1 Disable LED
LED can be powered off by driving LEDCTL pin low longer than tOFF.
tOFF
4~ 6.5ms
LEDCTL
Soft-Start
1 2 34 12
20.3mA
19.8mA
18.8mA
17.8mA
Soft-start
20.3mA
19.8mA
18.8mA
I
LED
Fig 7-6 Disable LED
7.3.7.2 Initialization of LED
The luminance can be adjusted to the initial value by driving LEDCTL pin “H” longer than tRESET
(LED remains power-on.)
tRESET
4~ 6.5ms
17.8mA
16.8mA
LEDCTL
I
LED
Soft-start
20.3mA
19.8mA
18.8mA
17.8mA
tRESET
4~ 6.5ms
16.8mA
11 2 34 23
19.8mA
18.8mA
17.8mA
LEDCTL
I
LED
Soft-start
20.3mA
19.8mA
18.8mA
but not over tOFF.
51 2 34 67
16.0mA
12.8mA
10.3mA
Fig 7-7 Initialization of LED
* Timer description
・tRESET timer starts at the falling edge of the input clock from LEDCTL, and is cleared at the rising edge of the input
clock from LEDCTL.
・tOFF timer starts at the rising/falling edge of the input clock from LEDCTL and turns off when timer overflows.
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RN5T653 CHARGE PUMP FOR WHITE LED
g
7.3.7.3 Operation Flow
Case1:
1. Power ON
Power ON : LEDCTL pin turns to "H"
2. Luminance Setting
3.Wait Subroutine
(tRESET)
4.Dimmer Setting
Luminance Setting ex) 16.8mA (4 Pulses)
LEDCTL pin is maintained at "H" during tRESET.
Dimmer Setting Value:8.0mA (9 Pulses)
IRQ is generated
5.Wait Subroutine
(tRESET)
6. Luminance Setting
Fig 7-8 Operation Flow: Case1
* Wait Subroutine: Subroutine needs to be inserted to any status.
3.Wait Subroutine
(tRESET)
1.Power ON 2. Luminance Setting
LEDCTL
Soft-Start
20.3mA
1
2
19.8mA
18.8mA
tRESET
4~ 6.5ms
4
3
17.8mA
16.8mA
123
19.8mA
18.8mA
4 56789
17.8mA
16.8mA
16.0mA
4.Dimmer Setting
tRESET
4~ 6.5ms
12.8mA
10.3mA
9.0mA
8.0mA
5.Wait Subroutine
(tRESET)
IRQ is generated
Wait Subroutine
6. Luminance Settin
2
1
34
19.8mA
18.8mA
17.8mA
16.8mA
ILED
Fig 7-9 Operation Diagram: Case1
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RN5T653 CHARGE PUMP FOR WHITE LED
Case2:
1.Power ON
Power ON : LEDCTL pin turn to "H"
2.Luminance Setting
3.Wait Subroutine
(tRESET)
4.Dimmer Setting
5.Wait Subroutine
(TOFF)
Luminance Setting ex)16.8mA (4 Pulses)
LEDCTL pin is maintained at "H" during tRESET.
Dimmer Setting Value:8.0mA (9 Pulses)
LEDCTL pin is maintained at "L" during tOFF.
6.Power OFF
IRQ is generated
7.Power ON
8.Luminance Setting
Power ON : LEDCTL pin turns to "H"
Luminance Setting Value:16.8mA (4 Pulses)
Note*: Power ON/OFF means RN5T653 power ON/OFF, not the system's.
LEDCTL
LED
I
1.Power ON
Soft-Start
20.3mA
Fig 7-10 Operation Flow: Case2
3.Wait Subroutine
(tRESET)
2.Luminance Setting
tRESET
18.8mA
17.8mA
4~ 6.5ms
16.8mA
19.8mA
18.8mA
17.8mA
1 2 34 1234 56789
19.8mA
4.Dimmer Setting
16.8mA
16.0mA
12.8mA
10.3mA
9.0mA
Fig 7-11 Operation Diagram: Case2
8.0mA
5.Wait Subroutine
(tOFF)
tOFF
4~ 6.5ms
6.Power OFF
7.Power ON
Soft-Start
IRQ is generated
8.Luminance Setting
1 2 34
20.3mA
19.8mA
18.8mA
17.8mA
16.8mA
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RN5T653 CHARGE PUMP FOR WHITE LED
Case3:
1.Power ON
Power ON : LEDCTL pin turns to "H"
2.Luminance Setting
Luminance Setting Value :16.8mA(4 Pulses)
IRQ is generated
Luminance Setting Value:16.8mA(4 Pulses)
3.Wait Subroutine
(tRESET)
4.Luminance Setting
Luminance Setting Value :16.8mA(4 Pulses)
Fig 7-12 Operation Flow: Case3
IRQ is generated
3.Wait Subroutine
(tRESET)
19.8mA
4.Luminance Setting
18.8mA
17.8mA
16.8mA
LEDCTL
1.Power ON
Soft-start
2.Luminance Setting
tRESET
1 2 34 1234
20.3mA
19.8mA
18.8mA
17.8mA
16.8mA
4~ 6.5ms
I
LED
Fig 7-13 Operation Diagram: Case3
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RN5T653 CHARGE PUMP FOR WHITE LED
7.3.8 Charge Pump Electrical Characteristics
Operating Conditions (unless otherwise specified) VCCVIN=3.6V, Ta=25℃, C1=C2=1uF, Cout=2.2uF
Symbol Parameter Condition Min Typ Max Units
Charge Pump
VIN Operating Voltage VCCVIN voltage 2.7 4.5 V
I
Max. Output current VCCVIN≧3.2V, VOUT voltage 80 mA
OUT
1x mode, (VCCVIN-Vout)/Iout
RON Output resistance
1.5xmode,
(1.5xVCCVIN-Vout)/Iout
V
Over voltage protection VOUT Rising 4.65 4.8 4.95 V
OVP
F
Switching Frequency - 1.18 1.25 1.40 MHz
OSC
T
Soft-start time - 30 180 300 us
SOFT
Isc Supply current
1x mode
1.5x mode
1.5
1
5
6
Iss Standby supply current VCCVIN current 5 uA
I
Current limit VOUT shorted 20 50 100 mA
LIM
V
1x to 1.5x transition threshold - 220 mV
TH1
V
1x to 1.5x transition time - 100 us
TIM
LED Driver
Isink Maximum Sink Current Each DIN1-4 20 mA
ACC LED current accuracy Setting DATA Max, DIN1-4=0.25V -5 5 %
I
LED current matching Vfdiff<0.4V -2 2 %
MAT
V
Current Regulator Dropout Setting DATA Max 220 mV
Drop
I
DIN1-4 leakage in shut-down - -1 0.1 1 uA
LEAK
Ω
mA
Table 7-4 Charge Pump Electrical Characteristics
7.4 UVLO (Under Voltage Lock Out)
Operating Conditions (unless otherwise specified) VCCVIN = 3.6V, C
Symbol Parameter Condition Min Typ Max Units
V
Under voltage lock out threshold VCCVIN rising 2.25 V
Release
V
Under voltage lock out threshold VCCVIN falling 2.05 2.20 2.35 V
Detect
V
UVLO Hysteresis - 50 mV
HYS
Table 7-5 UVLO Electrical Characteristics
= 1uF, Ta = 25℃
REFO
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RN5T653 CHARGE PUMP FOR WHITE LED
7.5 Thermal Shut-down Circuit
Overheat state can be detected by comparing the output voltages from two temperature detection circuits, which have
different temperature characteristics. If the overheat state is detected, RN5T653 will turn off to protect itself from
overheating.
7.5.1 Thermal Shut-down Electrical Characteristics
Operating Conditions (unless otherwise specified) VCCVIN= 3.6V, C
= 1uF, Ta = 25℃
REFO
Symbol Parameter Condition Min Typ Max Units
T
Detected Temperature - 140 ℃
DET
T
Return Temperature - 110 ℃
RET
ISS Supply Current - 4 uA
Table 7-6 Thermal Shut-down Electrical Characteristics
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RN5T653 CHARGE PUMP FOR WHITE LED
8. Electrical Characteristics
8.1 Absolute Maximum Ratings
Symbol Parameter Condition Rated value Units
VCCVIN Power Supply Voltage Battery Voltage Input Pins -0.3～6.0 V
Vin Input Voltage Range All Input Pins -0.3～VCCVIN+0.3 V
PD
T
Storage Temperature - -55～+125 ℃
stg
Package
Allowable Dissipation
Table 8-1 Absolute Maximum Ratings
8.2 Recommendation of Operation Conditions
Symbol Parameter Condition Min Typ Max Units
VCCVIN Power Supply Voltage Battery Voltage Input Pins
Ta Temp. of Operation - -40 85 ℃
Mounted on Board,
T
=70℃
a
TBD mW
2.7 3.6 4.5 V
Table 8-2 Recommendation of Operation Conditions
8.3 DC Characteristics
Operating Conditions (unless otherwise specified) VCCVIN= 3.6V, C
Symbol Parameter Condition Min Typ Max Units
Vih “H” Input Voltage - 1.6
Vil “L” Input Voltage - 0.2
I
Input Leakage Current 1 VCCVIN -1 0.1 1 uA
IL1
Table 8-3 DC Characteristics
= 1uF, Ta = 25℃
REFO
8.4 General Characteristics
Operating Conditions (unless otherwise specified) VCCVIN= 3.6V, CREFO = 1uF, Ta = 25℃
Symbol Parameter Condition Min Typ Max Units
Ishut Shut-down Supply Current Ta=25℃ 1 3 uA
Table 8-4 General Characteristics
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RN5T653 CHARGE PUMP FOR WHITE LED
9. Package Information
©2009 Rev. 1.8 Page 19
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