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Multi Mode Capless ChargeTM Pump
POWER MANAGEMENT Description
The SC1461 is a versatile charge pump designed for use in battery operated power supply applications. A simple, low current boost circuit can be implemented without costly inductors or capacitors. Internal MOSFETs and control circuitry eliminate the need for costly board space and design time. The small device footprint allows for compact circuit design. The SC1461 is a CaplessTM charge pump for applications that require up to 8mA of output current. Three modes of output voltage can be programmed via the ADJ pin. Modes include: VO = (1.32*VIN) 4% @ 7mA of output current VO = (1.515 * VIN) 4% @ 4mA of output current and the adjustable mode where an external resistor divider determines the output voltage. The SC1461 is packaged in a 5 lead SOT-23 package.
SC1461
Features
K K K K
Small size - 5 pin SOT-23 package 4% voltage accuracy 65uA typ. quiescent current User selectable output voltages of 1.515* VIN, 1.32 * VIN, or adjustable output K All specifications rated over full temperature range (-40C to 85C)
Applications
K K K K K
PDA Power Supplies Notebook Power Supplies Peripheral Card Supplies Industrial Power Supplies High Density DC/DC Conversion
Typical Application Circuit
R1 Vo = 1.03 x Vin x 1 + R1 + R2
Vin = 3.3V SC1461 Vo = 5.0V Vin = 2.5V SC1461 Vo = 3.3V Vo SC1461 Vin
5
4
5
4
4
Disable Vin
Disable Vin
Cin 0.22uF
Cout 47nF
Cin 0.22uF
Cout 47nF
Cout 47nF
Disable Vin
Vo
Vo
Vo
5
R1
Cin 0.22uF
GND
GND
Vin
1
2
3
1
2
3
3
2
GND
ADJ
ADJ
ADJ
R2
Revision 1, December 2000
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SC1461
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Supply Voltage Output Voltage Thermal Resistance Junction to Ambient Operating Temperature Temperature Range Storage Temperature Lead Temperature (Soldering) 10 Seconds Symbol VIN VO JA TA TJ TSTG TL Maximum -0.3 to +4 -0.3 to +6 410 -40 to +85 -40 to +125 -65 to 150 300 Units V V C/W C C C C
Electrical Characteristics
Unless specified: 2.25V Vin 3.63V, 0 Io 8mA, Cin = 0.22uF, Cout = 47nF, Ta = -40 to 85 C
Parameter Input Supply Voltage Input Supply Current
Symbol VIN IIN
Conditions ADJ, DISABLE = GND, IO = 0mA, VIN = 3.3V ADJ = GND, DISABLE = VIN IO = 0mA, VIN = 3.3V
Min 2.25
Typ 65 0.1
Max 3.63 100 1 4 4
Units V A
Output Voltage Output Ripple (pk-pk)(1) Output Current Efficiency(1) Oscillator Frequency(2) Time to Regulation at Turn-On(1) Disable Threshold Voltage Disable current
VO VR IO OSC tON DISHI DISLO IDISABLE
ADJ, DISABLE = GND, IO 4mA ADJ = VIN , DISABLE = GND, IO 7mA ADJ = VIN , DISABLE = GND, IO 7mA ADJ = VIN = 2.5V, DISABLE = GND ADJ, DISABLE = GND,VIN = 3.3V ADJ = VIN = 2.5V, DISABLE = GND IO = 7mA ADJ = VIN = 2.5V, DISABLE = GND ADJ, DISABLE = GND,VIN = 3.3V ADJ = VIN = 2.5V, DISABLE = GND IO = 7mA, COUT = 47nF
-4 -4 7 4
1.515 X VIN 1.32 x VIN 50 8 7 50 12 13.5 25 1
% mV mA mA % MHz s
1.3 10
V V A
.5 Disable = 0V
0.9 1
NOTES: (1) All electrical characteristics are for the application circuit on page 1. (2) Guaranteed by design. (3) This device is ESD sensitive. Use of standard ESD handling precautions is required.
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SC1461
POWER MANAGEMENT Pin Configuration
(Top View)
Ordering Information
Device (1) SC1461ISKTR SC1461EVB Package 5-SOT-23 Evaluation Board
Note: (1) Only available in tape and reel packaging. A reel contains 3000 devices. 5 Lead SOT-23
Pin Descriptions
Pin # 1 2 Pin Name DISABLE GND Pin Function Disable pin is internally pulled to VIN resulting in standby mode and the output will be disabled. Grounding this pin will enable the output. Ground. Mode selection pin. Grounding this pin will yield Vo = 1.515*Vin. Pulling this pin to VIN will yield VO = 1.32*VIN. An external voltage divider connected at VIN will achieve: 3 ADJ
R1 Vo = 1.03 x Vin x 1 + R1 + R 2
See Applications Circuits. 4 5 VO VIN Voltage output. Supply voltage input.
Block Diagram
Marking Information
Top Mark
1461
BottomMark
yyww
yyww
= Datecode (Example: 9908)
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SC1461
POWER MANAGEMENT Typical Characteristics
Vou t Vs Iou t (1.32 Mo de, Vin = 2.25V )
3.2 00 3.1 00 4.5 00 3.0 00 4.3 00 4.7 00
Vo ut Vs Io u t (1. 32 Mo de, V in = 3 .3V)
Vout (V)
Vout (V)
+4% 25C - 40C 85C -4% 2. 0E-3 4. 0E-3
Io u t (A)
2.9 00 2.8 00 2.7 00 2.6 00 2.5 00 0 00. 0E+0
4.1 00 3.9 00 3.7 00 3.5 00 +4% 25C - 40C 85C -4% 2.0 E-3 4.0 E-3
I o u t (A)
6. 0E-3
8. 0E-3
0 00. 0E+0
6.0 E-3
8.0 E-3
Typical Vout vs Iout 1.32 Mode Vin = 2.25V
Vo ut Vs Io u t (1. 32 Mo de, V in = 2 .5V )
3.5 00 3.4 00 3.3 00 3.2 00 5.1 00 4.9 00 4.7 00 4.5 00
Vo ut ( V)
Typical Vout vs Iout 1.32 Mode Vin = 3.30V
Vo ut Vs Io ut (1 .3 2 M od e, Vin = 3.6 3V )
Vout (V)
3.1 00 3.0 00 2.9 00 2.8 00 2.7 00 2.6 00 2.5 00 0 00. 0E+0 2.0 E-3 4.0 E-3
I o u t (A)
4.3 00 4.1 00 3.9 00 3.7 00 3.5 00 0 00. 0E+0 2. 0E-3 4. 0E-3
Io ut ( A)
+4% 25C - 40C 85C -4% 6.0 E-3 8.0 E-3
+4% 25C - 40C 85C -4% 6. 0E-3 8. 0E-3
Typical Vout vs Iout 1.32 Mode Vin = 2.50V
Typical Vout vs Iout 1.32 Mode Vin = 3.63V
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SC1461
POWER MANAGEMENT Typical Characteristics
Vo ut Vs Io ut (1.515 Mo de , V in = 2.25V)
3.7 00 5.3 00 3.5 00 3.3 00
Vo ut ( V)
V ou t Vs Iou t (1.515 Mode, Vin = 3 .3V)
5.1 00 4.9 00 4.7 00
Vout (V)
3.1 00 +4% 2.9 00 25C - 40C 2.7 00 2.5 00 0 00. 0E+0 2. 0E-3 4. 0E-3
Io ut ( A)
4.5 00 4.3 00 4.1 00 3.9 00 3.7 00 3.5 00 +4% 25C - 40C 85C -4% 2. 0E-3 4. 0E-3
Io u t (A)
85C -4% 6. 0E-3 8. 0E-3
0 00. 0E+0
6. 0E-3
8. 0E-3
Typical Vout vs Iout 1.515 Mode Vin = 2.25V
Vou t Vs Iou t (1.515 Mode, Vin = 2 .5V )
4.1 00 3.9 00 3.7 00
Typical Vout vs Iout 1.515 Mode Vin = 3.30V
V o ut V s Iout (1 .5 15 Mo de , V in = 3.63 V )
6.0 00
5.5 00
Vout (V)
3.3 00 3.1 00 2.9 00 2.7 00 2.5 00 0 00. 0E+0 +4% 25C - 40C 85C -4% 2. 0E-3 4. 0E-3
Io u t (A)
V o ut ( V)
3.5 00
5.0 00
4.5 00
+4% 25C - 40C 85C -4%
4.0 00
6. 0E-3
8. 0E-3
3.5 00 0 00. 0E+0 2.0 E-3 4.0 E-3
Io ut ( A)
6.0 E-3
8.0 E-3
Typical Vout vs Iout 1.515 Mode Vin = 2.50V
Typical Vout vs Iout 1.515 Mode Vin = 3.63V
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SC1461
POWER MANAGEMENT Typical Characteristics
Vout V s Iout ( 1.4 2 Ad ju st Mo de , V in = 2.25V)
3.4 00 3.3 00 3.2 00 3.1 00 5.1 00 4.9 00 4.7 00
Vo ut Vs Io ut (1.42 Adju st Mode, Vin = 3 .3V )
Vout (V)
3.0 00 2.9 00 2.8 00 2.7 00 2.6 00 2.5 00 0 00. 0E+0 2. 0E-3 4. 0E-3
Io u t (A)
Vout (V)
4.5 00 4.3 00 4.1 00 3.9 00 3.7 00 3.5 00 +4% 25C - 40C 85C -4% 2. 0E-3 4. 0E-3
Io u t (A)
+4% 25C - 40C 85C -4% 6. 0E-3 8. 0E-3
0 00. 0E+0
6. 0E-3
8. 0E-3
Typical Vout vs Iout Adjust Mode = 1.42 * Vin Vin = 2.25V
Vout V s Iout (1 .42 Ad ju st Mo de, V in = 2 .5V)
Typical Vout vs Iout Adjust Mode = 1.42 * Vin Vin = 3.30V
Vo ut Vs Io ut (1 .4 2 A djust Mode, Vin = 3.63V)
5.5 00 5.3 00 5.1 00 4.9 00
3.9 00 3.7 00 3.5 00
Vout (V)
3.3 00 3.1 00 2.9 00 2.7 00 2.5 00 0 00. 0E+0
V out (V)
+4% 25C - 40C 85C -4% 2.0 E-3 4.0 E-3
I o u t (A)
4.7 00 4.5 00 4.3 00 4.1 00 3.9 00 3.7 00 +4% 25C - 40C 85C -4% 2. 0E-3 4. 0E-3
Io u t (A)
6.0 E-3
8.0 E-3
3.5 00 0 00. 0E+0
6. 0E-3
8. 0E-3
Typical Vout vs Iout Adjust Mode = 1.42 * Vin Vin = 2.50V
Typical Vout vs Iout Adjust Mode = 1.42 * Vin Vin = 3.63V
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SC1461
POWER MANAGEMENT Typical Characteristics
I in v s V in ( Io ut = 0 m A , T a = 2 5 C ) I in v s V i n ( Io ut = 0 m A , T a = - 4 0 C )
0 . 0 60 0 . 0 50 0 . 0 40 Iin (m A ) 0.030 0.020 0.010 0.000 2.25 2.75
V in ( V )
1 . 5 1 5 M o de 1 . 3 2 M od e
0 . 0 50 0 . 0 45 0 . 0 40 0.035 Iin ( m A ) 0.030 0.025 0.020 0.015 0.010 0.005 0.000 3.25 2.25 2.75
V in ( V )
1 . 5 1 5 M o de 1 . 3 2 M od e
3.25
Typical Iin vs Vin Iout = 0mA Ta = 25C
Iin v s V in (I o ut = 0 m A , T a = 8 5 C )
Typical Iin vs Vin Iout = 0mA Ta = -40C
0 . 0 60 0 . 0 50 0 . 0 40 Iin ( m A ) 0.030 0.020 0.010 0.000 2.25 2.75
V in ( V )
1 . 5 1 5 M o de 1 . 3 2 M od e
3.25
Typical Iin vs Vin Iout = 0mA Ta = 85C
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SC1461
POWER MANAGEMENT Outline Drawing - SOT-23-5L
Land Pattern - SOT-23-5L
Contact Information
Semtech Corporation Power Management Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804
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