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TS34063AA
Dc to Dc Converter Controller
Pin assignment:
1. SC
2. SE
3. CT
4. Gnd
5. Comp.
6. Vcc
7. Ipk
8. Vdriver
Supply Voltage Range 3 V to 40V
Output Driving Current 1.5A
Oscillator Frequency up to 100KHz
General Description
The TS34063A is a monolithic switching regulator and subsystem intended for use as DC to DC converter. It contains an
internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active peak current limit
circuit, drive and a high current output switch.
The TS34063A is specifically designed to be incorporated in step-up, step-down and voltage inverting converter
applications.
The TS34063A is offered in SOP-8 and DIP-8 package.
Features
Power forward control circuit
Operating voltage form 3V to 40V
Low standby current
Current limit adjustable
Output switch current up to 1.5A
Variable oscillator frequency up to 100KHz (max)
Output voltage adjustable
Pin Descriptions
Name Description
SC Switch Collector
SE Switch Emitter
CT Timing Capacitor
Gnd Ground
Comp. Comparator Inverting Input
Vcc Vcc Collector
Ipk Ipk Sense
Vdriver Driver
Applications
Charger
xD-ROM, xDSL product
DC to DC converter s
Block Diagram
Ordering Information
Part No.
TS34063ACD DIP-8
TS34063ACS
Operating Temp.
(Ambient)
-20 ~ +85
o
C
Package
SOP-8
TS34063A 1-8 2005/02 rev. A
Absolute Maximum Rating
Supply Voltage VCC 40 V
Comparator Input Voltage Range VFB - 0.3 ~ 40 V
Switch Collector Output Voltage V
Switch Emitter Voltage V
Switch Collector to Emitter Voltage V
Driver Collector Voltage Vc(driver) 40 V
Driver Collector Current (note 1) Ic(driver) 100 mA
Output Switching Current ISW 1.5 A
Power Dissipation DIP-8
SOP-8
Operating Junction Temperature Range TJ -0 ~ +125
Storage Temperature Range T
Note: Maximum package power dissipation limits must be observed
40 V
C(SW)
40 V
E(SW)
40 V
CE(SW)
Pd
-65 ~ +150
STG
1.0
0.5
W
o
C
o
C
Electrical Characteristics (V
=5V, Ta =25
CC
o
C; unless otherwise specified.)
Parameter Symbol Test Conditions Min Typ Max Unit
Oscillator (OSC)
Frequency F
Charge Current I
Discharge Current I
Discharge to Charge current ratio
Current Limit Sense Voltage V
CT = 1nF, Vpin5= 0V 24 33 42 KHz
OSC
VCC = 5V ~ 40V -- 30 -- uA
CHARGE
DISCHARGEVCC
I
DISCHARGE
/ I
IPK(SENSE)IDISCHARGE
CHARGE
= 5V ~ 40V -- 200 -- uA
Pin7 to Vcc -- 6.5 -- --
= I
250 -- 350 mV
CHARGE
Output switch (note1)
Saturation Voltage V
Saturation Voltage V
ISW= 1A, pin1,8 connected) -- 1.0 1.3 V
CE(SAT)
ISW= 1A, Id=50mA -- 0.45 0.7 V
CE(SAT)
DC current gain HFE ISW = 1A, Vce= 0.5V -- 75 -- -Collector off-state current I
Vce= 40V -- 0.01 100 uA
C(OFF)
Comparator
Threshold Voltae V
REF
1.225 1.25 1.275 V
Line regulation RegLine VCC = 3V ~ 40V -- -- 6 mV
Total device
V
= 5V ~ 40V, CT = 1nF,
CC
Supply Current ICC
pin7=Vcc, pin5>Vth,
pin2=Gnd, remaining pins
-- 1.6 3 mA
open
Note: 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient
temperature as possible
2. If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (<=300mA)
and high driver currents (>=30mA), it may take up to 2uS for it to come out of saturation. This condition will
shorten the off time at frequencies >= 30KHz, and is magnified at high temperature. This condition does not
occur with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration
is used, the following output drive condition is recommended:
Forced Bata of output switch: Ic output / (Ic driver – 7mA*) >= 10
* The 100ohm resistor in the emitter of the driver divide requires about 7mA before the output switch conducts.
TS34063A 2-8 2005/02 rev. A
Circuit Description
TS34063A 3-8 2005/02 rev. A
Typical Application Circuit
Test Conditions Results
LINE REGULATION Vin= 8V~16V, Io= 175mA 30mV +/- 0.05%
Load Regulation Vin= 12V, Io= 75mA to 175mA 10mV +/- 0.017%
Output Ripple Vin=12V, Io= 175mA 400mVpp
Efficiency Vin=12V, Io= 175mA 87.7%
Output Ripple with Optional Filter Vin=12V, Io= 175mA 40mVpp
Figure 7. Step Up Converter
TS34063A 4-8 2005/02 rev. A
Typical Application Circuit (continues)
Test Conditions Results
Line Regulation Vin= 15V~25V, Io= 500mA 12mV +/- 0.12%
Load Regulation Vin= 25V, Io= 50mA to 500mA 3mV +/- 0.03%
Output Ripple Vin= 25V, Io= 500mA 120mVpp
Short Circuit Current Vin= 25V, RL= 0.1ohm 1.1A
Efficiency Vin= 25V, Io= 500mA 83.7%
Output Ripple with Optional Filter Vin= 25V, Io= 500mA 40mVpp
Figure 9. Step Down Converter
TS34063A 5-8 2005/02 rev. A
Typical Application Circuit (continues)
Test Conditions Results
Line Regulation Vin= 4.5V~6.0V, Io= 100mA 3mV +/- 0.012%
Load Regulation Vin= 5V, Io= 10mA to 100mA 22mV +/- 0.09%
Output Ripple Vin= 5V, Io= 100mA 500mVpp
Short Circuit Current Vin= 5V, RL= 0.1ohm 900mA
Efficiency Vin= 5V, Io= 100mA 62.2%
Output Ripple with Optional Filter Vin= 5V, Io= 100mA 70mVpp
Figure 11. Voltage Inverting Converter
TS34063A 6-8 2005/02 rev. A
−
−
+
Design Formula Table
Test Step Up Step Down Voltage Inverting
VinVfVout
−+
ton
toff
( ton+ toff )
CT 4.0 x 10
Ipk(switch)
Rsc
2Iout(max)
⎛
⎜
⎜
⎝
(min)
1
min
f
switchIpk
(min)
+ 1
⎞
⎟
⎟
⎠
⎞
⎟
⎟
⎠
2Iout(max)
⎛
⎜
⎜
⎝
VsatVcc
−
–5
ton 4.0 x 10 –5 ton 4.0 x 10 –5 ton
⎛
ton
⎜
⎜
toff
⎝
3.0
)(
f
1
min
3.0
switchIpk
VfVout
VoutVsatVcc
2Iout(max)
⎞
⎟
⎟
)(
⎠
⎛
⎜
⎜
⎝
f
VsatVcc
1
min
⎛
⎜
⎜
⎝
3.0
switchIpk
VfVout−+||
ton
toff
⎞
⎟
+ 1
⎟
⎠
⎞
⎟
⎟
)(
⎠
L(min)
Co
⎛
⎛
min
⎜
⎜
⎝
⎛
⎜
9
⎜
⎝
⎞
Vsat)Vin(
−
⎟
⎟
)Ipk(switch
⎠
⎞
*
tonIout
⎟
⎟
)(
ppVripple
⎠
)ton(
max*
(min)
⎜
⎜
⎝
switchIpk
⎛
⎜
⎜
⎝
⎞
VoutVsatVin
−−
⎟
(max)*
ton
⎟
)(
⎠
+
))((
tofftonswitchIpk
)(8
ppVripple
⎛
(min)
⎜
⎜
switchIpk
⎝
⎞
⎟
⎟
⎠
⎛
⎜
9
⎜
⎝
⎞
VsatVin
−
⎟
(max)*
ton
⎟
)(
⎠
⎞
*
tonIout
⎟
⎟
)(
ppVripple
⎠
Terms and Definitions
z Vsat = Saturation Voltage of the output switch.
z Vf
z Vin= Normal input voltage
z Vout: Desied Output voltage, |Vout| =1.25 (1+R2 / R1)
z Iout : Desired output current.
z fmin : Minimum desired output switching frequency at the selected values for Vin
z Vripple(p-p): Desired peak-to-peak output ripple voltage. in practice, the calculated capacitor value will need to be
= Forward Voltage drop of the rectifier.
The following power supply characteristics must be chosen:
and Io.
increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value
since it will directly affect the line and load regulation.
TS34063A 7-8 2005/02 rev. A
SOP-8 Mechanical Drawing
A
SOP-8 DIMENSION
MILLIMETERS INCHES
MIN MAX MIN MAX
o
0
o
7
o
16
DIM
9
PB
1
G
D
8
R
M
C
F
K
A 4.80 5.00 0.189 0.196
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 (typ) 0.05 (typ)
K 0.10 0.25 0.004 0.009
M 0o 7
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019
DIP-8 Mechanical Drawing
A
DIP-8 DIMENSION
8
1
5
B
4
L
C
J
DIM
A 9.07 9.32 0.357 0.367
B 6.22 6.48 0.245 0.255
C 3.18 4.45 0.125 0.135
D 0.35 0.55 0.019 0.020
G 2.54 (typ) 0.10 (typ)
J 0.29 0.31 0.011 0.012
K 3.25 3.35 0.128 0.132
L 7.75 8.00 0.305 0.315
M - 10o - 10o
K
M
G
D
MILLIMETERS INCHES
MIN MAX MIN MAX
TS34063A 8-8 2005/02 rev. A
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