SS6563
Versatile DC/DC Converter
FEATURES
Operates from 3V to 30V input voltage
Internal 2A peak current switch.
Continuous output current of 1.5A
Bootstrapped driver.
High-side current sense capability.
High efficiency (up to 90%).
Internal
±2%
reference.
Low quiescent current at 1.6mA.
Operating frequency from 100Hz to 100KHz.
DESCRIPTION
The SS6563 is a monolithic control circuit that
provides the primary functions required for DC to
DC converters and high-side-sensed constant
current sources. The device consists of an inter-
nal temperature compensated reference, com-
parator, controlled duty-cycle oscillator with an
active current-sense circuit, bootstrapped driver,
and high-current output switch. This device is
specifically designed to construct a constant cur-
rent source for battery chargers with a minimum
number of external components. A bootstrapped
driver can drive the NPN output switch to satura-
tion for higher efficiency and less heat dissipation.
The SS6563 can deliver 1.5A continuous current
without requiring a heat sink.
APPLICATIONS
Constant Current Source for Battery Chargers.
Saver for Cellular phones.
Step-Down DC/DC Converter Module.
TYPICAL APPLICATION CIRCUIT
D3
R1
470
D2
1N4148
C3
1N4148
L1
300µH
D1
1N5819
R2
390K
C2
1000pF
RB
RA
1K
3K
+
C4
470µF
5V/1A
When V
IN
>15V
make R1=1K
+
1µF
8
1
2
3
4
BOOST
IS
DC
DE
CF
GND
V
IN
8V~25V
+
RS
0.22
7
6
VCC
C1
100µF
5
FB
SS6563
R3
2.2M
Line Regulation
Load Regulation
Short Circuit Current
V
IN
= 10V~20V @ I
O
=1A
V
IN
= 15V, @ I
O
=100mA~1A
V
IN
=15V, @ R
L
= 0.1Ω
Step-Down Converter
40mV
20mV
1.3A
Rev.2.02 4/06/2004
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SS6563
ORDERING INFORMATION
SS6563-CXXX
Packing
TR: Tape and reel
TB: Tubes
DC
PIN CONFIGURATION
PDIP-8, SO-8
TOP VIEW
1
2
3
4
8
7
BOOST
Package type
DE
N: PDIP-8 (only available in tubes)
CF
S: SO-8
GND
Example: SS6563CSTR
à
in SO-8 package shipped in tape and reel
IS
6
VCC
5
FB
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ..............................................................……………............................. 30V
Comparator Input Voltage Range ............................................………….......... -0.3V~30V
Switch Collector Voltage ....................................................……………......................... 30V
Switch Emitter Voltage ......................................................……………......................... 30V
Switch Collector to Emitter Voltage ..................................…………............................. 30V
Driver Collector Voltage ....................................................…………….......................... 30V
Switch Current ................................................………………......................................... 2A
Power Dissipation and Thermal Characteristics
DIP Package
Ta= 25°C ............................…………................................ 1.0W
Thermal Resistance .............…………......................... 100°C/W
SO Package
Ta= 25°C......................……………............................... 625mW
Thermal Resistance ...................………...................... 160°C/W
Operating Junction Temperature .....................................................………............. 125°C
Operating Ambient Temperature Range .......................……………......................... 0~70°C
Storage Temperature Range ...................................………….................... - 65°C ~ 150°C
Rev.2.02 4/06/2004
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SS6563
TEST CIRCUIT
R1
VCC
1K
50mA
Current Source
1A
Current Source
4.55V
@VCC=5V
1
2
DE
3
2V/0V
I
DISCHG
/ I
CHG
4
GND
CF
DC
BOOST 8
IS
VCC
FB
7
6
VCC
5
1.275V
1.225V
4.75V
SS6563
CT
1nF
ELECTRICAL CHARACTERISTICS
PARAMETER
Oscillator
Charging Current
Discharge Current
Voltage Swing
Discharge to Charge Cur-
rent Ratio
5.0V≤VCC≤30V
5.0V≤VCC≤30V
PIN 3
V
IS
=VCC
(VCC= 5V, TA=25°C, unless otherwise specified.)
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
I
CHG
I
DISCHG
V
OSC
I
DISCHG
/
I
CHG
10
100
25
150
0.6
6.0
40
200
µA
µA
V
Current Limit Sense Voltage I
CHG
=I
DISCHG
Output Switch
Saturation Voltage, Emitter
Follower Connection
Saturation Voltage
DC Current Gain
Collector Off-State Current
I
DE
=1.0A;
V
BOOST
=V
DC
= VCC
I
DC
=1.0A; I
BOOST
=50mA, (Forced
β≅20)
I
SC
=1.0A; V
CE
=5.0V
V
CE
=30V
VCC – V
IS
250
300
350
mV
V
CE(SAT)
1.5
1.8
V
V
CE (SAT)
h
FE
I
C(OFF)
35
0.4
120
10
0.7
V
nA
Rev.2.02 4/06/2004
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SS6563
ELECTRICAL CHARACTERISTICS
PARAMETER
Comparator
Threshold Voltage
T
A
=25°C
0°C
≤
T
A
≤
70°C
Threshold Voltage Line
Regulation
Input Bias Current
3.0V≤VCC≤30V
V
IN
=0V
V
IS
=VCC, pin 5>V
FB
5.0V≤ VCC
≤30V
C
T
=1nF
PIN 2=GND
Remaining pins open
V
FB
1.225
1.21
1.25
1.275
1.29
0.3
1
V
V
mV/V
µA
(VCC= 5V, TA=25°C, unless otherwise specified.)
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
REG
LINE
I
IB
0.1
0.4
Supply Current
I
CC
1.6
3
mA
TYPICAL PERFORMANCE CHARACTERISTICS
t
ON-OFF
, Output Switch ON-OFF Time (
µ
S)
2
I
CC
, Supply Current (mA)
VCC=5V
V
IS
=VCC
PIN 5=GND
ON -TIME
1000
1.6
1.2
C
T
= 1nF
V
IS
= VCC
PIN 2 =GND
100
0.8
10
OFF-TIME
0.4
1
0.1
1
10
100
0
CT, Oscillator Timing Capacitor (nF)
Fig. 1 Output Switch ON-OFF Time vs. Oscillator
Timing Capacitor
0
5
10
15
20
25
30
VCC, Supply Voltage (V)
Fig. 2 Standby Supply Current vs. Supply Voltage
Rev.2.02 4/06/2004
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SS6563
TYPICAL PERFORMANCE CHARACTERISTICS
1.3
(Continued)
350
V
CC
-V
IS
Threshold Voltage ( mV)
1.28
V
FB
, Threshold Voltage (V)
VCC = 5V,
C
T
= 1nF,
PIN 2 = GND
340
330
320
310
300
290
280
270
260
250
0
VCC = 5V,
C
T
= 1nF,
PIN 2 = GND
1.26
1.24
1.22
1.2
0
10
20
Temperature (
°
C)
30
40
50
60
70
80
10
20
30
40
50
60
70
80
Fig. 3 V
FB
, Threshold Voltage vs. Temperature
Fig. 4
Temperature (°C)
I
S
Threshold Voltage vs. Temperature
1.8
0.8
V
CE(SAT)
, Saturation Voltage (V)
1.7
VCC = 5V
PIN 1, 7, 8 = VCC
PIN 3, 5 = GND
V
CE(SAT)
, Saturation Voltage (V)
0.6
VCC = 5V
PIN 7 = VCC
PIN 2, 3, 5 =
GND
1.6
1.5
1.4
0.4
0.2
Forced Beta = 20
1.3
1.2
0
0.5
1
1.5
0
0
0.5
1
1.5
I
E
, Emitter Current (A)
Fig. 5 Emitter Follower Configuration Output Switch
Saturation Voltage vs. Emitter Current
I
C
, Collector Current (A)
Fig. 6 Common Emitter Configuration Output Switch
Saturation Voltage vs. Collector Current
BLOCK DIAGRAM
DC
1
Q2
Q1
80
DE
2
7
QS
R
8
BOOST
IS
Is
CT
Oscillator
CF
3
Comparator
1.25V
Reference
Voltage
GND
4
+
6
VCC
-
5
FB
Rev.2.02 4/06/2004
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