TS650
Buck Switching Regulator
Pin assignment:
1. Out
2. P.Gnd
3. CT
4. Gnd
5. FB
6. Vcc
7. Comp.
8.
Enable
Supply Voltage Range 3 V to 30V
Output Driving Current 500mA
Oscillator Frequency up to 100KHz
General Description
The TS650 is a monolithic buck switching regulator, it is consist of an voltage reference, error amplifier, current limited set
by an external resistor, power forward modular controller and switching frequencies up to 100KHz are set by an external
capacitor.
Additionally, a chip enable feature is provided to power down reducing the supply current, and with a minimum number of
external components, the TS650 offer a simple and cost effective solution.
The TS650 is offered in SOP-8 package.
Features
Power forward control circuit
Operating voltage form 3V to 30V
Low standby current
Current limit adjustable
Output switch current up to 500mA
Variable oscillator frequency up to 100KHz (max)
Shut down control
1.25V voltage reference Output
Pin Descriptions
Name
Output
P.Gnd
CT
Gnd
FB
Vcc
Comp.
Enable
PWM Output
Power Ground
Oscillator Control
Ground
Voltage Feedback
Power Supply
Feedback Compensation
ON/OFF control
Description
Applications
Charger
xD-ROM, xDSL product
DC to DC converter s
Ordering Information
Part No.
TS650CS
Operating Temp.
-20 ~ +85 C
o
Package
SOP-8
Block Diagram
TS650
1-4
2003/12 rev. A
Absolute Maximum Rating
Supply Voltage
Comparator Input Voltage Range
Collector Output Voltage
Collector to Emitter Voltage
Output Switching Current
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature 1.6mm(1/16”) from case for 10Sec.
V
CC
V
FB
V
C(SW)
V
CE(SW)
I
SW
T
J
T
STG
T
LEAD
30
- 0.3 ~ 30
30
30
500
-20 ~ +125
-65 ~ +150
260
V
V
V
V
mA
o
o
o
C
C
C
Electrical Characteristics
(V
CC
=5V, Ta =25 C; unless otherwise specified.)
o
Parameter
Reference
Comp. Connect to FB
Output voltage change with
temperature
Line regulation
Output switch (note1)
Saturation Voltage
DC current gain
Collector off-state current
Oscillator (OSC)
Frequency
Charge Current
Discharge Current
Discharge to Charge current ratio
Current Limit Sense Voltage
ON/OFF driver control
ON driver voltage
OFF driver voltage
ON driver current
Total device
supply current
Symbol
Test Conditions
Min
1.23
Typ
1.25
- 0.1
- 0.2
Max
1.27
1
1
5
Unit
V
%
mV
V
REF
RegLine
Ta= -20 C ~ 25 C
Ta= 25
o
C ~ 85
o
C
V
CC
= 5V ~ 30V
I
SW
=0.5A
I
SW
=1A, Vce=0.5V
Vce=30V
C
T
= 1nF, Vpin5=0V
V
CC
= 5V ~ 30V
V
CC
= 5V ~ 30V
Pin7 to Vcc
I
DISCHARGE
= I
CHARGE
250
4
V
CC
= 3V ~ 30V
24
o
o
V
CE(SAT)
H
FE
I
C(OFF)
F
OSC
I
CHARGE
I
DISCHARGE
I
DISCHARGE
/ I
CHARGE
V
IPK(SENSE)
Von
Voff
Ion
I
CC
1.0
75
40
33
35
220
6.5
1.2
V
--
100
42
uA
KHz
uA
uA
--
350
5
1
100
mV
V
V
mA
mA
V
CC
= 5V ~ 30V, C
T
= 1nF,
pin7=Vcc, pin5>Vth,
pin2=Gnd, remaining pins
open
3
5
-400
Input bias current
I
IB
Vin=0V
Note 1: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient
temperature.
nA
TS650
2-4
2003/12 rev. A
Typical Application Circuit
Device
R1
R2
R3
R4
R5
R6
R7
Remark:
Value
5.6K, 1/8W
1K,1/8W
100ohm, 1/4W
100ohm, 1/4W
0.33ohm, 1W
300ohm, 1/2W
300ohm, 1/2W
Device
C1
C2
L1
D1
Q1
Value
470pF, 16V
470uF, 16V
180uH, 2A
SK34A
TSB1386CY
* Output = 1.25V * (R1/R2 +1) = 1.25V * (5.6K/1K + 1) = 8.25V @ 3A
* SK34A: Taiwan semiconductor, Schottky 3A/40V in SMA package
* TSB1386CY: Taiwan semiconductor, PNP transistor 5A/20V in SOT-89 package
TS650
3-4
2003/12 rev. A
SOP-8 Mechanical Drawing
A
SOP-8 DIMENSION
DIM
MILLIMETERS
MIN
4.80
3.80
1.35
0.35
0.40
MAX
5.00
4.00
1.75
0.49
1.25
INCHES
MIN
0.189
0.150
0.054
0.014
0.016
MAX
0.196
0.157
0.068
0.019
0.049
16
9
B
P
A
B
C
D
F
G
K
M
F
1
8
G
C
D
K
M
R
1.27 (typ)
0.10
0.25
0
o
5.80
0.25
7
o
6.20
0.50
0.05 (typ)
0.004
0.009
0
o
0.229
0.010
7
o
0.244
0.019
P
R
TS650
4-4
2003/12 rev. A
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