st735 STMicroelectronics, st735 Datasheet

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st735

Manufacturer Part Number
st735
Description
-5v Inverting, Negative Output Current-mode Pwm Regulator
Manufacturer
STMicroelectronics
Datasheet

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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.
SCHEMATIC DIAGRAM
August 2002
DESCRIPTION
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
CURRENT-MODE PWM REGULATOR
-5V INVERTING, NEGATIVE OUTPUT
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
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.
DIP-8
applications. The ST735 employ a
SO-8
ST735
1/9

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st735 Summary of contents

Page 1

... 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 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 ...

Page 2

... ST735 ABSOLUTE MAXIMUM RATINGS Symbol V DC Input Voltage (V to GND Shutdown Voltage (SHDN to GND) SHDN V Switch Voltage ( Feedback Voltage (V FB OUT V Output Voltage (V to GND) OUT OUT Other Input Voltage (SS GND) I Peack Switch Current LX Power Dissipation 70° ...

Page 3

... ORDERING CODES TYPE ST735 TYPICAL APPLICATION CIRCUIT NOTE: 1) All capacitors are X7R ceramic 2) C can be omitted if are used higher values for the input and output capacitors C 5 DIP-8 SO-8 ST735CN ST735CD = ST735 SO-8 (T&R) ST735CD-TR =100pF. 1 3/9 ...

Page 4

... ST735 ELECTRICAL CHARACTERISTICS (Refer to test circuit -40 to 125°C, unless otherwise specified. Typical value are referred at T amb Symbol Parameter V Input Voltage IN V Output Voltage OUT I Output Current OUT I Supply Current SUPPLY I Standby Current STANDBY I Short Circuit Current SC V Undervoltage Lock-out ...

Page 5

... TYPICAL CHARACTERISTICS (Referred to typical application circuit, T Figure 1 : Output Voltage vs Temperature Figure 2 : Reference Voltage vs Temperature Figure 3 : Oscillator Frequency vs Temperature =25° C unless otherwise specified) amb Figure 4 : Efficency vs Temperature Figure 5 : Efficency vs Ouput Current Figure 6 : Supply Current vs Temperature ST735 5/9 ...

Page 6

... ST735 Figure 7 : Supply Current vs Input Voltage Figure 8 : Shutdown Threshold vs Temperature Figure 9 : Peak Inductor Current vs Output Current 6/9 Figure 10 : Switch Current Limit vs Soft Start Voltage Figure Resistance vs Temperature Figure Resistance vs Input Voltage ...

Page 7

... Plastic DIP-8 MECHANICAL DATA mm. DIM. MIN. TYP A 3.3 a1 0.7 B 1.39 B1 0.91 b 0 8.8 e 2.54 e3 7. 3.3 Z 0.44 inch MAX. MIN. TYP. 0.130 0.028 1.65 0.055 1.04 0.036 0.020 0.5 0.015 9.8 0.346 0.100 0.300 0.300 7.1 4.8 0.130 1.6 0.017 ST735 MAX. 0.065 0.041 0.020 0.386 0.280 0.189 0.063 P001F 7/9 ...

Page 8

... ST735 DIM. MIN 0 0.65 b 0.35 b1 0. 4 3 8/9 SO-8 MECHANICAL DATA mm. TYP MAX. MIN. 1.75 0.25 0.003 1.65 0.85 0.025 0.48 0.013 0.25 0.007 0.5 0.010 45˚ (typ.) 5.0 0.189 6.2 0.228 1.27 3.81 4.0 0.149 1.27 0.015 0.6 ˚ (max.) 8 inch TYP. MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019 0.196 0.244 ...

Page 9

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