1
United States Patent No. 6,504,422
www.semtech.com
POWER MANAGEMENT
OBJECTIVE -NOVEMBER
9, 2000
5+$
mAhXLife
TM
Led Driver With
5.0V, 4.5V, Or 4.0V Output
Revision 8, .ebruary 2003
Description
.eatures
Applications
Typical Application Circuit
The SC600 is a versatile charge pump designed for use
in battery operated power supply applications. The wide
input range is matched for Li-Ion battery applications.
mAhxLife
TM
LED Drivers feature a fractional charge pump
implementation with efficiency comparable to a switch-
ing regulator without costly inductors. Only two tiny ce-
ramic capacitors are required, and the inductorless imple-
mentation provides a reduced-EMI solution. Patented
low noise mode switching circuitry and constant output
current allow the use of extremely small input and out-
put capacitors.
The SC600
charge pump can be used for applications
that require up to 120mA of output current with a 4.0V
or 4.5V output. The 5.0V output version provides up to
60mA of output current.
mAhXLife
TM
LED drivers replace switched mode power
supplies and provide comparable efficiency with less cost,
area, noise, and complexity.
K
Small size - MLP Micro 10 lead 3x3mm or MSOP-10
package allows for a complete solution in .05 sq.
in.
K
Peak efficiency over 90% (extends battery life)
K
.our component versions available
K
60mA versions available in 5.0V and 4.5V output
K
120mA versions available in 4.5V and 4.0V output
K
Short circuit and over-temperature protection
K
Soft Start function
K
Shutdown current <1A
K
Selectable fixed frequencies of 8kHz, 32kHz,
262kHz and 650kHz
K
Low input and output ripple
K
Regulated to
5%
K
Ease of use
K
Cellular phones
K
LED backlighting
K
PDA power supplies
K
Portable electronics
K
Electronic books
K
Handheld computers
K
Wireless web appliances
Cin
1.0u.
2.7V to 6.5V
Cbucket1
1.0u.
Cbucket2
1.0u.
VIN
EN
CD4
CX8
GND
C.2-
C.2+
C.1-
C.1+
VOUT
3
6
4
5
8
7
10
9
2
1
U1
5
+
$
Cout
0.33u.
UP TO 6 LEDS
4.0V, 4.5V or 5.0V
Efficiency vs. Input Voltage
load current = 60mA
50.00
55.00
60.00
65.00
70.00
75.00
80.00
85.00
90.00
95.00
100.00
3.00
3.10
3.20
3.30
3.40
3.50
3.60
3.70
3.80
3.90
4.00
4.10
4.20
Input Voltage [V]
Efficiency [%]
SC600A 5.0V
Other 5.0V Reg
Other 5.0V Regulated Voltage Doubler with a
load current = 60mA
90% of Li-Ion
Battery Life
2
2002 Semtech Corp.
United States Patent No. 6,504,422
www.semtech.com
5+$
POWER MANAGEMENT
Absolute Maximum Ratings
Electrical Characteristics
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Unless specified: T
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= -40C to 85C, Cin=Cbucket = 1.0. (ESR = 0.1
), Cout=1.0u. (ESR = 0.1
), Vin= 2.85V to 5.5V
#
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not implied.
Note: (1) By JESD51 standards
3
2002 Semtech Corp.
United States Patent No. 6,504,422
www.semtech.com
5+$
POWER MANAGEMENT
Electrical Characteristics (Cont.)
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Notes:
(1) 650kHz allows the use of a smaller bucket capacitor
(2) Peak to peak output ripple voltage with C
OUT
=C
BUCKET
=1uF and X5R dielectric
(3) Guaranteed by design
(4) This device is ESD sensitive. Use of standard ESD handling precautions is required.
(5) Version C has an extended input voltage range of operation at Vin = 2.60V to 5.5V.
Unless specified: T
)
= -40C to 85C, Cin=Cbucket = 1.0. (ESR = 0.1
), Cout=0.33u. (ESR = 0.1
), Vin= 2.85V to 5.5V
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