ST735
-5V INVERTING, NEGATIVE OUTPUT
CURRENT-MODE PWM REGULATOR
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CONVERTS +4.0V TO + 6.2V INPUT TO -5V
OUTPUT
1W GUARANTEED OUTPUT POWER
75% TYPICAL EFFICIENCY
0.8mA QUIESCENT CURRENT
10µA SHUTDOWN MODE
160KHZ FIXED FREQUENCY OSCILLATOR
CURRENT MODE PWM CONVERTER
LOW NOISE AND JITTER
SOFT START
SIMPLE APPLICATION CIRCUIT
UNDERVOLTAGE LOCKOUT
DESCRIPTION
The ST735 is a Bi-CMOS, inverting switch mode
DC-DC regulator with internal Power MOSFET's
that generates a fixed -5V output voltage from a
4V to 6.2V input voltage; is guaranteed an output
current of 200mA for inputs greater than 4.5V. The
quiescent current for this device is typically of
0.8mA and, in shutdown mode it is reduced to
10µA.
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SCHEMATIC DIAGRAM
DIP-8
SO-8
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These power-conserving features, along with high
efficiency and applications circuits, that lend itself
to minaturization, make the ST735 excellent in a
broad range of on-card, HDD and portable
equipment applications. The ST735 employ a
high performance current mode pulse with
modulation (PWM) control scheme to provide tight
output voltage regulation and low noise. The
fixed frequency oscillator is factory trimmed to
160KHz, allowing for easy noise filtering. The
regulator in production is tested to guarantee an
output accuracy within ±5% over all specified
conditions.
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August 2002
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ST735
ABSOLUTE MAXIMUM RATINGS
Symbol
VIN
SHDN
Parameter
DC Input Voltage (VIN to GND)
Shutdown Voltage (SHDN to GND)
VLX
Switch Voltage (Lx to VIN)
VFB
Feedback Voltage (VOUT to GND)
VOUT
Value
-0.3 to +7
V
-0.3 to V++0.3
V
-12.5 to +0.3
V
-11 to +0.3
V
Output Voltage (VOUT to GND)
Other Input Voltage (SS, CC to GND)
-11 to +0.3
V
-0.3 to V++0.3
V
Peack Switch Current
ILX
Ptot
Power Dissipation at Tj = 70°C
Unit
DIP-8
SO-8
2
A
725
470
mW
Tstg
Storage Temperature Range
-55 to +150
°C
Top
Operating Junction Temperature Range
-40 to +125
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
Rthj-case
Parameter
Thermal Resistance Junction-case
2
CONNECTION DIAGRAM (top view)
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2
VREF
Reference Output Voltage
3
4
5
SS
CC
VOUT
Soft Start
Compensation Input
Negative Output Voltage
6
7
8
GND
LX
VIN
Ground
Switch Output
Positive Supply - Voltage Input
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1
Pin N°
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PIN DESCRIPTION
Symbol
SHDN
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DIP-8
Name and Function
SHUT-DOWN Control (VCC=ON GND=Shutdown
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Unit
°C/W
ST735
ORDERING CODES
TYPE
DIP-8
SO-8
SO-8 (T&R)
ST735
ST735CN
ST735CD
ST735CD-TR
TYPICAL APPLICATION CIRCUIT
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NOTE:
1) All capacitors are X7R ceramic
2) C5 can be omitted if are used higher values for the input and output capacitors C2=47µF, C1=100pF.
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ST735
ELECTRICAL CHARACTERISTICS (Refer to test circuit, VIN=5V, CIN = 4.7µF, COUT = 10µF, L = 10µH,
Tamb = -40 to 125°C, unless otherwise specified. Typical value are referred at Tamb= 25°C)
Symbol
VIN
Parameter
Test Conditions
Min.
Input Voltage
VOUT
IOUT
Max.
4
Output Voltage
Output Current
Supply Current
6.2
V
-5.25
-5
-4.75
V
VIN = 4.0V to 6.2V IOUT = 0 to 175mA
Tamb= -40 to 125°C
-5.25
-5
-4.75
V
VIN = 4.5V to 6.2V Tamb= 0 to 125°C
200
275
VIN = 4.5V to 6.2V IOUT = 0 to 175mA
Tamb= -40 to 125°C
175
VOUT = -5V
mA
mA
175
Includes Switch Current
ISTANDBY Standby Current
VSHDN = 0V
mA
0.8
1.6
mA
1
10
µA
ISC
Short Circuit Current
1.5
VLO
Undervoltage Lock-out
3.5
A
∆VOUT
Line Regulation
VIN = 4.0V to 6.2V
0.1
Load Regulation
IOUT = 0 to 200mA
0.003
Reference Voltage
Tamb= 25°C (Note 1)
VREF
Reference Drift
RDSON
LX ON Voltage
ILEAK
LX Leakage Current
ISH
Shutdown Pin Current
VIL
Shutdown Input Low
Threshold
Shutdown Input High
Threshold
Maximum Oscillator
Frequency
Efficency
VIH
fOSC
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Note1 : Tested at IVREF = 0mA
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VDS = 10V
ct
(s)
IOUT = 100mA
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Compensation Pin
Impedance on CC Pin
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Tamb= -40 to 125°C
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4
∆VOUT
∆VREF
Unit
VIN = 4.5V to 6.2V IOUT = 0 to 200mA
Tamb= -40 to 125°C
VIN = 4.0V
ISUPPLY
Typ.
uc
od
V
%/V
%/mA
1.247
V
50
ppm/°C
0.5
Ω
µA
1
2
1
µA
0.25
V
V
160
KHz
72
%
7.5
KΩ
ST735
TYPICAL CHARACTERISTICS (Referred to typical application circuit, Tamb=25°C unless otherwise specified)
Figure 1 : Output Voltage vs Temperature
Figure 4 : Efficency vs Temperature
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Figure 2 : Reference Voltage vs Temperature
Figure 5 : Efficency vs Ouput Current
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Figure 3 : Oscillator Frequency vs Temperature
Figure 6 : Supply Current vs Temperature
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ST735
Figure 7 : Supply Current vs Input Voltage
Figure 10 : Switch Current Limit vs Soft Start
Voltage
Figure 8 : Shutdown Threshold vs Temperature
Figure 11 : LX On Resistance vs Temperature
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Figure 9 : Peak Inductor Current vs Output
Current
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Figure 12 : LX On Resistance vs Input Voltage
ST735
Plastic DIP-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MAX.
MIN.
3.3
TYP.
MAX.
0.130
a1
0.7
0.028
B
1.39
1.65
0.055
0.065
B1
0.91
1.04
0.036
0.041
b
b1
0.5
0.38
0.020
0.5
D
0.015
0.020
9.8
0.386
E
8.8
0.346
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
7.1
I
4.8
L
Z
0.44
1.6
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3.3
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0.017
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0.280
0.189
0.130
0.063
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P001F
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ST735
SO-8 MECHANICAL DATA
mm.
DIM.
MIN.
TYP
A
inch
MAX.
MIN.
TYP.
MAX.
a1
1.75
0.1
0.068
0.25
a2
0.003
0.009
1.65
0.064
a3
0.65
0.85
0.025
0.033
b
0.35
0.48
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.25
0.5
0.010
0.019
c1
45˚ (typ.)
D
4.8
5.0
0.189
E
5.8
6.2
0.228
0.244
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1.27
0.050
e3
3.81
0.150
F
3.8
4.0
0.149
L
0.4
1.27
0.015
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0.6
S
8˚ (max.)
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0.196
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0.157
0.050
0.023
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0016023
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ST735
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
© The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics - Printed in Italy - All Rights Reserved
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