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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.
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)
enables to save energy and miniaturize transformer size.
.
Quiescent current is low with output off.
.
Set size can be miniaturized with compact TP-5H power
package.
.
Surface mounting on board permits allowable power
dissipation to be raised.
.
Enhanced mount flexibility with range of formed products.
.
On-chip protective circuitry (fold back short circuit, thermal
over load).
.
External noise suppression pin provided.
Package Dimensions
unit : mm
3103-TP-5H
[L88MS33T]
SANYO : TP-5H
Pin Assignment
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Input voltage V
Strobe pin input voltage V
Allowable power dissipation Pd max Ta % 25°C, no heat sink 1 W
Thermal resistance (junction-atmosphere) θj-a 125 °C/W
Thermal resistance (junction-to-case) θj-c 20 °C/W
Operating temperature Topr –20 to +85 °C
Storage temperature Tstg –55 to +150 °C
max 18 V
IN
max VINmax V
ST
Tc = 25°C, with infinite heat sink 6.25 W
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
31097HA(II) No.5516-1/7
Top view
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Operating Conditions atTa=25°C
Parameter Symbol Conditions Ratings Unit
Input voltage
Output current
Output on control voltage
Output off control voltage
V
l
OUT
V
V
IN
STL
STH
L88MS33T
4to17 V
0 to 500 mA
–0.3 to +0.8 V
2.0 to V
IN
V
Operating Characteristics at Tj = 25 °C, VIN= 6.3 V, IO= 500 mA, C
see specified Test Circuit.
Parameter Symbol Conditions min typ max Unit
[Output on, V
Output voltage V
Dropout voltage
Line regulation ∆V
Load regulation ∆V
Peak output current l
Output short-circuit current l
Quiescent current
Output noise voltage V
Temperature coefficient of
output voltage
Ripple rejection Rrej f = 120 Hz, 4.3 V % V
Output on control voltage V
[Output off, V
Low output voltage V
Static current I
Output off control voltage V
ST
ST
= ‘‘L’’]
= ‘‘H’’ ]
OUT
V
DROP1
V
DROP2lO
OLN
OLD
OP
OSC
I
Q1
I
Q2
NO
∆V
/∆Tj Tj = 25 to 125 °C ±0.4 mV/°C
OUT
STL
OFF VST= 5 V 20 200 mV
O
OFF VST= 5 V, Except I
Q
STH
= 150 mA 0.2 0.3 V
4V%VIN% 17 V 10 50 mV
5mA%I
I
= 0 1.9 5 mA
OUT
% 500 mA 24 80 mV
OUT
10 Hz % f % 100 kHz 30 µVrms
% 17 V 70 dB
IN
STB
= 100 µF, CIN, Cn=1µF,
OUT
3.2 3.3 3.4 V
0.4 0.6 V
600 900 mA
100 300 mA
24 50 mA
35 70 µA
2.0 V
0.8 V
IN
V
No.5516-2/7
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Equivalent Circuit Block Diagram
Start-up circuit
Reference voltage
Test Circuit
Error
amp
L88MS33T
ON/OFF
Control
Thermal
protector
Short circuit
protector
Notes: 1. To ensure operational stability, CIN,C
2. Because the output capacitor C
OUT
, and Cn should be placed as close to the IC as possible.
OUT
is set at over 100 µF 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 V
is minus (–) and GND is plus (+) (reversed connection), excessive current flow will occur.
IN
No.5516-3/7
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Function Table
L88MS33T
V
STB
LH
HL
V
OUT
On/off Control Input Equivalent Circuit
Sample Application Circuit
Control
signal
Adjustment of output voltage V
OUT
(1) Reducing V
V
OUT
R
between the Cn and V
A
(2) Increasing V
V
OUT
OUT
can be lowered by externally connecting a resistor
OUT
can be raised by externally connecting a resistor R
between the Cn and GND pins.
OUT
pins.
B
No.5516-4/7
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With infinite heat sink
L88MS33T
Pd max – Ta
Mounted on copper-clad
area of 2,000mm
Mounted on copper-clad
area 740 mm
Mounted on copper-clad
area 180 mm
Mounted on copper-clad
area 36 mm
No heat sink
Allowable power dissipation, Pd max – W
2
2
2
2
Ambient temperature, Ta – °C
1) The allowable power dissipation is 1.0 W (Ta = 25°C) 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 × 50×0.8 mm
3
) with a copper thickness of 18 µm.
Pd max – S
Board
Copper-clad area S
2
(mm
)
Allowable power dissipation, Pd max – W
Copper-clad area,S–mm
2
2) 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.
3) 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
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L88MS33T
–V
O
Output voltage, V
–V
O
VO–V
IN
Input voltage, VIN–V
VO–I
O
–V
DROP
Dropout voltage, V
–V
O
V
DROP–IO
Output current, I
VO–V
ST
–A
O
Output voltage, V
–V
STH
Output off control voltage, V
–mA
–V
STL
Output on control voltage, V
Q
Output current, IO–A
V
STH,VSTL
–Ta
Ambient temperature, Ta – °C
IQ–I
O
Output voltage, V
–mA
Q
Quiescent current, I
–mA
Q OFF
Strobe voltage, VST–V
IQ–V
IN
Input voltage, V
I
Q OFF–VIN
(except IST)
–V
IN
Quiescent current, I
Output current, IO–A
Quiescent current during strobe, I
Input voltage, VIN–V
No.5516-6/7
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L88MS33T
–A
OP
–V
O
Output voltage, V
–A
OSC
VO–Ta
Ambient temperature, Ta – °C
I
OP,IOSC
–Ta I
–mA
Q
Quiescent current, I
–µA
Q OFF
IQ–Ta
Ambient temperature, Ta – °C
Q OFF (ST ON)
–Ta
(except IST)
Peak output current, I
Output short-circuit current, I
Ambient temperature, Ta – °C
Quiescent current during strobe, I
Ambient temperature, Ta – °C
Rrej – f
Cn=1µF
Cn = open
Ripple rejection, Rrej – dB
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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