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M5291P/FP
DC/DC Converter
REJ03D0841-0300 Rev.3.00 Jun 15, 2007
Description
M5291 is a semiconductor integrated circuit which is designed for switching regulator control. The device consists of a comparator, controlled pulse width oscillator (with peak current protection circuit), temperature compensated reference, and high current output switch. Especially, this IC was designed for Step-Down and Step-Up and Voltage-Inverting applications.
Features
* Wide supply voltage range: 2.5 to 40 V * Low dissipation current: 1.4 mA * Wide range of output Voltage adjust: 1.17 to 40 V * Output switch current: 200 mA * Wide range of switching frequency: 100 Hz to 100 kHz * Built-in peak current protection circuit
Application
General power supply system
Block Diagram
Switch collector
1 Q S R
8 Driver
Switch emitter
2 Oscillator
7
Peak current sense
Timing capacitor
3 Comparator 1.17 V Reference
6 VCC
+ -
5 Comparator input
Ground
4
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 1 of 9
M5291P/FP
Pin Arrangement
M5291P/FP Switch collector Switch emitter Timing capacitor Ground
1 2 3 4 8 7 6 5
Driver Peak current sense VCC Comparator input
(Top view) Outline: PRDP0008AA-A (8P4) [P] PRSP0008DE-C [FP] (recommend) PRSP0008DA-A (8P2S-A) [FP] (not recommend for new design)
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 2 of 9
M5291P/FP
Absolute Maximum Ratings
(Ta = 25C, unless otherwise noted)
Item Power supply voltage Input voltage Switch collector voltage Switch emitter voltage Collector emitter voltage Driver collector voltage Switch current Internal power dissipation Thermal derating Operating ambient temperature Storage temperature Symbol VCC VIN VC (S) VE (S) VCE (S) VC (D) ISW Pd K Topr Tstg Ratings 40 -0.3 to 40 40 40 40 40 200 625 440 6.25 4.5 -20 to +75 -55 to +125 Unit V V V V V V mA mW mW/C C C 8-pin DIP 8-pin FLAT 8-pin DIP 8-pin FLAT Conditions Comparator input
Electrical Characteristics
(Ta = 25C, VCC = 5 V)
Item Oscillator Charge current Discharge current Oscillator voltage Charge, discharge current ratio Current protection, detecting voltage Saturation voltage Saturation voltage Collector leak current Threshold voltage Threshold voltage regulation Input bias current Circuit current Symbol IC ID VOSC ID/IC VIPK Vsat1 Vsat2 IL VTH VTHREG IB ICC Min 20 150 270 1.11 Limits Typ 35 200 0.6 6 330 1.5 0.3 10 1.17 0.03 40 1.4 Max 50 250 390 2.0 0.6 1.23 0.2 200 2.5 Unit A A VP-P mV V V nA V mV/V nA mA Darlington connection ISW = 50 mA ISW = 50 mA IC (D) = 10 mA VCE = 40 V 3.0 VCC 40 V VIN = 0 V Test Conditions
Output
Comparator
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 3 of 9
M5291P/FP
Application Circuits
1. Step-up Circuit
VIN = 5 V VOUT = 12 V IO = 20 mA f = 50 kHz 1 Q S R 2 Oscillator D 3 CT 820 pF 4 1.17 V Comparator
+ -
L
510 H
8 R3 240 7 RSC 3 6
+
CIN 100 F
VIN 5V
5
VOUT 12 V/20 mA
+
COUT 100 F
R1 9.1 k
R2 1 k
2. Step-up Circuit with Transistor
L 10 H
VIN = 5 V VOUT = 12 V IO = 1 A f = 50 kHz 1
8 Q S R R3 1 k 7 Oscillator RSC 60 m 6
NPN Tr R4 D 680 CT 820 pF
2
3 1.17 V
Comparator
+ -
+
CIN 100 F
VIN 5V
4
5
VOUT 12 V/1 A
+
COUT 100 F
R1 9.1 k
R2 1 k
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 4 of 9
M5291P/FP 3. Step-down Circuit
VIN = 24 V VOUT = 5 V IO = 0.1 A f = 50 kHz 1 Q S R 2 D Oscillator 7 RSC 2 6 8 R3 1.2 k
CT L 440 H 330 pF
3 1.17 V
Comparator
+ -
+
CIN 100 F
VIN 24 V
4
5
VOUT 5 V/0.1 A
+
COUT 100 F
R1 3.6 k
R2 1.2 k
4. Step-down Circuit with Transistor
VIN = 24 V VOUT = 5 V IO = 1 A f = 50 kHz PNP Tr
R3 100 1 R4 300 2 Oscillator Q S R D 7 RSC 0.16 6 8
L 47 H CT 330 pF
3 1.17 V
Comparator
+ -
+
CIN
VIN 24 V
4
5
VOUT 5 V/1 A
+
COUT 100 F
R1 3.6 k
R2 1.2 k
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 5 of 9
M5291P/FP 5. Inverse Polarity Circuit
VIN = 5 V VOUT = -5 V IO = 40 mA f = 50 kHz 1 Q L 2 260 H 3 CT 820 pF D VOUT -5 V/40 mA 4 1.17 V Oscillator S R 7 RSC 1.5 6 8
Comparator
+ -
+
CIN 100 F
VIN 5V
5
+
COUT 100 F
R1 1 k
R2 3.3 k
6. Inverse Polarity Circuit with Transistor
VIN = 5 V VOUT = -12 V IO = 1 A f = 50 kHz PNP Tr
R3 100 1 R4 24 20 H 2 Oscillator Q S R L 7 RSC 0.1 6 8
3 CT 820 pF D 4 1.17 V
Comparator
+ -
+
CIN 100 F
VIN 5V
5
VOUT -12 V/1 A
+
COUT 220 F
R1 2.4 k
R2 22 k
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 6 of 9
M5291P/FP
Constant Definition
Constant
TON TOFF (TON + TOFF) MAX
Step-down Circuit
VOUT + VF VIN (MIN) - Vsat -VOUT 1 fMIN TON + TOFF TON 1+ TOFF 1 - TOFF fMIN 6 x 10-5 * TON 2 * IOUT (MAX) ( VIN (MIN) - Vsat - VOUT ) * TON (MAX) IPK 0.33 IPK 1.17 x (1 + R1 ) R2 (
Step-up Circuit
VOUT + VF - VIN (MIN) VIN (MIN) - Vsat 1 fMIN TON + TOFF TON 1+ TOFF 1 - TOFF fMIN 6 x 10-5 * TON 2 * IOUT (MAX) * ( 1 + VIN (MIN) - Vsat IPK TON ) TOFF (
Inverse Polarity Circuit VOUT + VF
VIN - Vsat 1 fMIN TON + TOFF TON 1+ TOFF 1 - TOFF fMIN
TOFF TON CT IPK L (MIN) RSC VO
6 x 10-5 * TON 2 * IOUT (MAX) * ( 1 + VIN (MIN) - Vsat IPK TON TOFF
)
) * TON (MAX)
) * TON (MAX)
0.33 IPK 1.17 x (1 + R1 ) R2
0.33 IPK 1.17 x (1 + R1 ) R2
Note:
VF: Forward Voltage of Diode Vsat: Output saturation voltage of M5291 (0.6 Vmax at single output, 2.0 Vmax at Darlington output) Setting switching frequency first and calculate each constant value.
Notes: 1. Peak current sense In overcurrent function, oscillator is stop, when voltage descend of external detecting resistance is more than 330 mV. 2. ON/OFF Control If you need stop the action, connected resistance (5 to 10 k) between supply voltage terminal and timing capacitor terminal. TON 3. is not established more than 0.857, because charge and discharge current ratio fixed 1 : 6. TON + TOFF
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 7 of 9
M5291P/FP
Package Dimensions
JEITA Package Code P-DIP8-6.3x8.84-2.54 RENESAS Code PRDP0008AA-A Previous Code 8P4 MASS[Typ.] 0.5g
8
5
c
1
4
*1
e1
E
*2 D
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
A
Reference Symbol
A2
Dimension in Millimeters
SEATING PLANE *3 b 3 bp e *3 b 2
e1 D E A A1 A2 bp b2 b3 c e L
Min Nom Max 7.32 7.62 7.92 8.7 8.9 9.1 6.15 6.3 6.45 4.5 0.51 3.3 0.4 0.5 0.6 0.9 1.0 1.3 1.4 1.5 1.8 0.22 0.27 0.34 15 0 2.29 2.54 2.79 3.0
JEITA Package Code P-SOP8-4.4x4.85-1.27
L
RENESAS Code PRSP0008DE-C
Previous Code --
A1
MASS[Typ.] 0.1g
*1
D
F
8
5
NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET.
bp
HE E
*2
Index mark
Terminal cross section ( Ni/Pd/Au plating )
1 Z e 4
*3
c
Reference Symbol
Dimension in Millimeters
bp
x
M L1
A1
L
y
Detail F
D E A2 A1 A bp b1 c c1 HE e x y Z L L1
A
A2
Min Nom Max 4.65 4.85 5.05 4.2 4.4 4.6 1.85 0.00 0.1 0.20 2.03 0.34 0.4 0.46 0.15 0.20 0.25 0 8 5.7 6.2 6.5 1.12 1.27 1.42 0.12 0.10 0.75 0.25 0.45 0.65 0.90
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 8 of 9
M5291P/FP
JEITA Package Code P-SOP8-4.4x5-1.27 RENESAS Code PRSP0008DA-A Previous Code 8P2S-A MASS[Typ.] 0.07g
8
5
HE
*1
E
F
1
Index mark
4
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
c
A2 A1
*2
D
Reference Symbol
Dimension in Millimeters
*3 e y
bp
D E A2 A1 A bp c HE e y L
Detail F
Min Nom Max 4.8 5.0 5.2 4.2 4.4 4.6 1.5 0.05 1.9 0.35 0.4 0.5 0.13 0.15 0.2 0 10 5.9 6.2 6.5 1.12 1.27 1.42 0.1 0.2 0.4 0.6
A
REJ03D0841-0300 Rev.3.00 Jun 15, 2007 Page 9 of 9
L
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