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Ordering number: EN5516
Monolithic Linear IC
L88MS33T 3.3 V, 0.5 A Low Dropout Voltage Regulator with On/Off Function
Overview
The L88MS33T is a low dropout voltage regulator with an output voltage of 3.3 V (standard), with an on-chip on/off function to maximize equipment power saving effectiveness. Because it can operate with a low input-output voltage difference, it contributes to smaller and more efficient set power supplies, optimum for audio-visual and office automation equipment.
Package Dimensions
unit : mm
3103-TP-5H
[L88MS33T]
Functions
. Output voltage: 3.3 V . On/off control of output voltage by strobe pin (active low) . 500 mA output current
Features
. Low minimum input-output voltage differential (0.4 V typ) save energy . enables to current is lowand miniaturize transformer size. Quiescent with output off. . Set size can be miniaturized with compact TP-5H power . package.mounting on board permits allowable power Surface to be . dissipationmount raised. with range of formed products. Enhanced . On-chip protectiveflexibility (fold back short circuit, thermal circuitry over load). . External noise suppression pin provided.
Specifications
Maximum Ratings at Ta = 25C
Parameter Input voltage Strobe pin input voltage Allowable power dissipation Thermal resistance (junction-atmosphere) Thermal resistance (junction-to-case) Operating temperature Storage temperature Symbol VIN max VST max Pd max j-a j-c Topr Tstg
SANYO : TP-5H
Pin Assignment
Top view
Conditions
Ratings 18 VIN max
Unit V V W W C/W C/W C C
Ta % 25C, no heat sink Tc = 25C, with infinite heat sink
1 6.25 125 20 -20 to +85 -55 to +150
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TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
31097HA(II) No.5516-1/7
L88MS33T
Operating Conditions at Ta = 25 C
Parameter Input voltage Output current Output on control voltage Output off control voltage Symbol VIN lOUT VSTL VSTH Conditions Ratings 4 to 17 0 to 500 -0.3 to +0.8 2.0 to VIN Unit V mA V V
Operating Characteristics at Tj = 25 C, VIN = 6.3 V, IO = 500 mA, COUT = 100 F, CIN, Cn = 1 F, see specified Test Circuit.
Parameter [Output on, VST = ``L''] Output voltage Dropout voltage Line regulation Load regulation Peak output current Output short-circuit current Quiescent current Output noise voltage Temperature coefficient of output voltage Ripple rejection Output on control voltage [Output off, VST = ``H'' ] Low output voltage Static current Output off control voltage Symbol VOUT VDROP1 VDROP2 VOLN VOLD lOP lOSC IQ1 IQ2 VNO VOUT/Tj Rrej VSTL VO OFF IQOFF VSTH Conditions min 3.2 lO = 150 mA 4 V % VIN % 17 V 5 mA % IOUT % 500 mA 600 IOUT = 0 10 Hz % f % 100 kHz Tj = 25 to 125 C f = 120 Hz, 4.3 V % VIN % 17 V typ 3.3 0.4 0.2 10 24 900 100 1.9 24 30 0.4 70 0.8 VST = 5 V VST = 5 V, Except ISTB 2.0 20 35 200 70 VIN max 3.4 0.6 0.3 50 80 300 5 50 Unit V V V mV mV mA mA mA mA Vrms mV/C dB V mV A V
No.5516-2/7
L88MS33T
Equivalent Circuit Block Diagram
Reference voltage
Start-up circuit
Error amp
ON/OFF Control
Short circuit protector
Thermal protector
Test Circuit
Notes: 1. To ensure operational stability, CIN, COUT, and Cn should be placed as close to the IC as possible. 2. Because the output capacitor COUT is set at over 100 F to prevent oscillation at low temperatures, a capacitor that exhibits little change in capacity with temperature variations should be used (such as a tantalum capacitor). 3. Adding capacitor Cn enables external noise suppression and ripple rejection to be improved. However, attention should be given to system stability (phase margin). 4. When the strobe (STB) pin is open, output is turned on by internal bias. When the strobe function is not used, the STB pin should be connected to GND to complete strobe operation. 5. When VIN is minus (-) and GND is plus (+) (reversed connection), excessive current flow will occur.
No.5516-3/7
L88MS33T
Function Table
VSTB L H
VOUT H L
On/off Control Input Equivalent Circuit
Control signal
Sample Application Circuit
Adjustment of output voltage VOUT (1) Reducing VOUT VOUT can be lowered by externally connecting a resistor RA between the Cn and VOUT pins. (2) Increasing VOUT VOUT can be raised by externally connecting a resistor RB between the Cn and GND pins.
No.5516-4/7
L88MS33T
Pd max - Ta Allowable power dissipation, Pd max - W
With infinite heat sink
Mounted on copper-clad area of 2,000 mm2 Mounted on copper-clad area 740 mm2 Mounted on copper-clad area 180 mm2 Mounted on copper-clad area 36 mm2 No heat sink
Ambient temperature, Ta - C
1)
The allowable power dissipation is 1.0 W (Ta = 25C) with no fin attached, but when mounted on a hybrid IC board or printed circuit board, high allowable power dissipation is achieved, despite the compact package. The graph below depicts the relationship between the copper-clad area and allowable power dissipation when mounted on a glass epoxy board (50 x 5 0 x 0.8 mm3) with a copper thickness of 18 m. Pd max - S
Allowable power dissipation, Pd max - W
Board Copper-clad area S (mm2)
Copper-clad area, S - mm2 2) 3) Pd is the value for when the solder on the surface of the IC heat sink has melted completely and the surface mount is horizontal. Please be advised that the flow solder application system (full-heat method) cannot be recommended.
Lead Formings
MA forming
LR forming
FA forming
No.5516-5/7
L88MS33T
VO - VIN Dropout voltage, VDROP - V VDROP - IO
Output voltage, VO - V
Input voltage, VIN - V VO - IO
Output current, IO - A VO - VST
Output voltage, VO - V
Output current, IO - A VSTH, VSTL - Ta Output off control voltage, VSTH - V Output on control voltage, VSTL - V
Output voltage, VO - V
Strobe voltage, VST - V IQ - VIN
- mA
Ambient temperature, Ta - C IQ - IO
Quiescent current, IQ - mA
Input voltage, VIN - V IQ OFF - VIN
(except IST)
Quiescent current, IQ - mA
Output current, IO - A
Quiescent current during strobe, IQ
OFF
Input voltage, VIN - V No.5516-6/7
L88MS33T
VO - Ta IQ - Ta
Quiescent current, IQ - mA
Output voltage, VO - V
Peak output current, IOP - A Output short-circuit current, IOSC - A
- A
Ambient temperature, Ta - C IOP, IOSC - Ta
Ambient temperature, Ta - C IQ OFF (ST ON) - Ta (except IST)
Quiescent current during strobe, IQ
OFF
Ambient temperature, Ta - C Rrej - f
Ambient temperature, Ta - C
Ripple rejection, Rrej - dB
Cn = 1 F
Cn = open
Frequency, f - Hz
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of March, 1997. Specifications and information herein are subject to change without notice.
No.5516-7/7

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