Datasheet Linear Technology LT1129 — Ficha de datos

Fabricante	Linear Technology
Serie	LT1129

Reguladores de baja potencia de micropoder con apagado

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PDF, 181 Kb, Idioma: en, Archivo subido: sept 2, 2017, Páginas: 16
Micropower Low Dropout Regulators with Shutdown

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Embalaje

	LT1129CQ#PBF	LT1129CQ#TRPBF	LT1129CQ-3.3#PBF	LT1129CQ-3.3#TRPBF	LT1129CQ-5#PBF	LT1129CQ-5#TRPBF	LT1129CS8#PBF	LT1129CS8#TRPBF	LT1129CS8-3.3#PBF	LT1129CS8-3.3#TRPBF	LT1129CS8-5#PBF	LT1129CS8-5#TRPBF	LT1129CST-3.3#PBF	LT1129CST-3.3#TRPBF	LT1129CST-5#PBF	LT1129CST-5#TRPBF	LT1129CT#PBF	LT1129CT-3.3#06PBF	LT1129CT-3.3#PBF	LT1129CT-5#06PBF	LT1129CT-5#PBF	LT1129IQ#PBF	LT1129IQ#TRPBF	LT1129IQ-3.3#PBF	LT1129IQ-3.3#TRPBF	LT1129IQ-5#PBF	LT1129IQ-5#TRPBF	LT1129IS8#PBF	LT1129IS8#TRPBF	LT1129IS8-3.3#PBF	LT1129IS8-3.3#TRPBF	LT1129IS8-5#PBF	LT1129IS8-5#TRPBF	LT1129IST-3.3#PBF	LT1129IST-3.3#TRPBF	LT1129IST-5#PBF	LT1129IST-5#TRPBF	LT1129IT#06PBF	LT1129IT#PBF	LT1129IT-3.3#PBF	LT1129IT-5#06PBF	LT1129IT-5#PBF	LT1129MPST-3.3	LT1129MPST-3.3#PBF	LT1129MPST-3.3#TR	LT1129MPST-3.3#TRPBF
N	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46
Package	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	DDPAK-5 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SO-8 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	TO-220 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete	SOT-223 Dibujo del esquema del paquete
Package Code	Q	Q	Q	Q	Q	Q	S8	S8	S8	S8	S8	S8	ST	ST	ST	ST	T	T	T	T	T	Q	Q	Q	Q	Q	Q	S8	S8	S8	S8	S8	S8	ST	ST	ST	ST	T	T	T	T	T	ST	ST	ST	ST
Package Index	05-08-1461	05-08-1461	05-08-1461	05-08-1461	05-08-1461	05-08-1461	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1630	05-08-1630	05-08-1630	05-08-1630	05-08-1421 (Std)	05-08-1421 (Flow 06)	05-08-1421 (Std)	05-08-1421 (Flow 06)	05-08-1421 (Std)	05-08-1461	05-08-1461	05-08-1461	05-08-1461	05-08-1461	05-08-1461	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1610 (S8)	05-08-1630	05-08-1630	05-08-1630	05-08-1630	05-08-1421 (Flow 06)	05-08-1421 (Std)	05-08-1421 (Std)	05-08-1421 (Std)	05-08-1421 (Std)	05-08-1630	05-08-1630	05-08-1630	05-08-1630
Pin Count	5	5	5	5	5	5	8	8	8	8	8	8	3	3	3	3	5	5	5	5	5	5	5	5	5	5	5	8	8	8	8	8	8	3	3	3	3	5	5	5	5	5	3	3	3	3

Paramétricos

Parameters / Models	LT1129CQ#PBF	LT1129CQ#TRPBF	LT1129CQ-3.3#PBF	LT1129CQ-3.3#TRPBF	LT1129CQ-5#PBF	LT1129CQ-5#TRPBF	LT1129CS8#PBF	LT1129CS8#TRPBF	LT1129CS8-3.3#PBF	LT1129CS8-3.3#TRPBF	LT1129CS8-5#PBF	LT1129CS8-5#TRPBF	LT1129CST-3.3#PBF	LT1129CST-3.3#TRPBF	LT1129CST-5#PBF	LT1129CST-5#TRPBF	LT1129CT#PBF	LT1129CT-3.3#06PBF	LT1129CT-3.3#PBF	LT1129CT-5#06PBF	LT1129CT-5#PBF	LT1129IQ#PBF	LT1129IQ#TRPBF	LT1129IQ-3.3#PBF	LT1129IQ-3.3#TRPBF	LT1129IQ-5#PBF	LT1129IQ-5#TRPBF	LT1129IS8#PBF	LT1129IS8#TRPBF	LT1129IS8-3.3#PBF	LT1129IS8-3.3#TRPBF	LT1129IS8-5#PBF	LT1129IS8-5#TRPBF	LT1129IST-3.3#PBF	LT1129IST-3.3#TRPBF	LT1129IST-5#PBF	LT1129IST-5#TRPBF	LT1129IT#06PBF	LT1129IT#PBF	LT1129IT-3.3#PBF	LT1129IT-5#06PBF	LT1129IT-5#PBF	LT1129MPST-3.3	LT1129MPST-3.3#PBF	LT1129MPST-3.3#TR	LT1129MPST-3.3#TRPBF
Design Tools	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File	LTspice File
Discrete Pass Element	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no
Dropout Voltage, V	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45	0.45
Export Control	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no	no
Features	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown	Shutdown
Ishutdown, µA	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16
Isupply, mA	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05
Max Junction Temp, Deg	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125	125
Number of Outputs	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
Operating Temperature Range, °C	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-55 to 125	-55 to 125	-55 to 125	-55 to 125
Output Current, A	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7
Output Voltage	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5	Adj, 3.3, 5
PSRR, dB	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64	64
Theta JA	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)	30В°C/W (Q), 60В°C/W (S8), 50В°C/W (ST), 50В°C/W (T)
Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Vin Max, V	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30
Vin Min, V	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15	4.15
Vout Max, V	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30	30
Vout Min, V	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8

Plan ecológico

	LT1129CQ#PBF	LT1129CQ#TRPBF	LT1129CQ-3.3#PBF	LT1129CQ-3.3#TRPBF	LT1129CQ-5#PBF	LT1129CQ-5#TRPBF	LT1129CS8#PBF	LT1129CS8#TRPBF	LT1129CS8-3.3#PBF	LT1129CS8-3.3#TRPBF	LT1129CS8-5#PBF	LT1129CS8-5#TRPBF	LT1129CST-3.3#PBF	LT1129CST-3.3#TRPBF	LT1129CST-5#PBF	LT1129CST-5#TRPBF	LT1129CT#PBF	LT1129CT-3.3#06PBF	LT1129CT-3.3#PBF	LT1129CT-5#06PBF	LT1129CT-5#PBF	LT1129IQ#PBF	LT1129IQ#TRPBF	LT1129IQ-3.3#PBF	LT1129IQ-3.3#TRPBF	LT1129IQ-5#PBF	LT1129IQ-5#TRPBF	LT1129IS8#PBF	LT1129IS8#TRPBF	LT1129IS8-3.3#PBF	LT1129IS8-3.3#TRPBF	LT1129IS8-5#PBF	LT1129IS8-5#TRPBF	LT1129IST-3.3#PBF	LT1129IST-3.3#TRPBF	LT1129IST-5#PBF	LT1129IST-5#TRPBF	LT1129IT#06PBF	LT1129IT#PBF	LT1129IT-3.3#PBF	LT1129IT-5#06PBF	LT1129IT-5#PBF	LT1129MPST-3.3	LT1129MPST-3.3#PBF	LT1129MPST-3.3#TR	LT1129MPST-3.3#TRPBF
RoHS	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Obediente	Desobediente	Obediente	Desobediente	Obediente

Notas de aplicación

Descargar
Power Conditioning for Notebook and Palmtop Systems &mdash AN51
PDF, 260 Kb, Archivo publicado: agosto 3, 1992
Notebook and palmtop systems need a number of voltages developed from a battery. Competitive solutions require small size, high efficiency and light weight. This publication includes circuits for high efficiency 5V and 3.3V switching and linear regulators, back light display drivers and battery chargers. All the circuits are specifically tailored for the requirements outlined above.
Extracto del documento
Application Note 51
August 1992
Power Conditioning for Notebook and Palmtop Systems
Robert Dobkin
Carl Nelson
Dennis OвЂ™Neill
Steve Pietkiewicz
Tim Skovmand
Milt Wilcox
INTRODUCTION Battery systems include NiCad, nickel-hydride, lead acid,
and rechargeable lithium, as well as throw-away alkaline
batteries. The ability to power condition a wide range
of batteries makes the ultimate product much more
attractive because power sources can be interchanged,
increasing overall system versatility. a very high efficiency (Figure 1) 5V or 3.3V step-down
(buck) switching regulator. These regulators feature a
low-loss saturating NPN switch that is normally configured with the negative terminal (emitter) at ground. The
LT1432 allows the switch to be floated as required in a
step-down converter, yet still provides full switch saturation for highest efficiency.
Burst ModeTM is a trademark of Linear Technology Coporation. 100
NORMAL MODE
(USE AMPS SCALE)
90 EFFICIENCY (%) Notebook and palmtop systems need a multiplicity of …
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5V to 3.3V Converters for Microprocessor Systems &mdash AN58
PDF, 310 Kb, Archivo publicado: sept 1, 1993
Many popular microprocessors operate from 3.3V supplies, yet they are used in systems where the predominate source of power is 5V. AN58 presents a collection of both linear and switching regulator solutions for conversion of 5V to 3.3V at currents ranging from 100mA to 20A. Applications information and a comparison of various bypass capacitor types is included. Most of the designs can be easily modified for other intermediate voltages such as 3.45V, 3.7V, and 4.1V.
Extracto del documento
Application Note 58
September 1993
5V to 3.3V Converters for Microprocessor Systems
Robert Dobkin, Mitchell Lee, Dennis O'Neill and Milt Wilcox
Introduction Linear Regulators The new generation of high performance microprocessors are built on dense, low breakdown voltage processes
in order to accommodate increased transistor counts.
These new processors require high current power at 3.3V,
developed from the 5V input used to power the rest of the
system. Special techniques are required to ensure proper
operation of the microprocessor and good heat dissipation within the computer system. Table 1 shows the range of components available for linear
regulation of 3.3V with a 5V input. With only 1.7V of
headroom, low dropout is essential. Low dropout regulators are available delivering currents from 125mA to 7.5A,
allowing almost any microprocessor to be powered with a
local 3.3V generation circuit. The first four devices (LT1020,
LT1120, LT1121 and LT1129) are PNP micropower low
dropout regulators. Since PNP transistors are much larger
than monolithic NPNs, higher current regulators use an
NPN pass device. The LT1117, LT1086, LT1083 through
LT1085, and LT1087 all use NPN pass devices. The NPN
structure requires about 1.2V headroom compared to the
400mV to 500mV dropout typical of PNP regulators, and
ground current of 5mA or 10mA, independent of output
current. Because of this constant quiescent current, the …
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A Fourth Generation of LCD Backlight Technology &mdash AN65
PDF, 5.9 Mb, Archivo publicado: nov 1, 1995
This publication, LTC's fourth effort devoted to LCD backlighting in as many years, treats the subject comprehensively. The text considers lamps, display and layout induced losses, circuitry, efficiency related issues, optimization and measurement techniques. Twelve appended sections cover lamp types, mechanical design, electrical and photometric measurement, layout, circuitry and related topics.
Extracto del documento
Application Note 65
November 1995
A Fourth Generation of LCD Backlight Technology
Component and Measurement Improvements Refine Performance
Jim Williams PREFACE
Current generation portable computers and instruments
utilize backlit LCDs (liquid crystal displays). These displays
have also appeared in applications ranging from medical
equipment to automobiles, gas pumps and retail terminals.
Cold cathode fluorescent lamps (CCFLs) provide the highest available efficiency for backlighting the display. These
lamps require high voltage AC to operate, mandating an
efficient high voltage DC/AC converter. In addition to good
efficiency, the converter should deliver the lamp drive in
sine wave form. This is desirable to minimize RF emissions.
Such emissions can cause interference with other devices,
as well as degrading overall operating efficiency. The sine
wave excitation also provides optimal current-to-light
conversion in the lamp. The circuit should permit lamp
control from zero to full brightness with no hysteresis or
вЂњpop-on,вЂќ and must also regulate lamp intensity vs power
supply variations.
The small size and battery-powered operation associated
with LCD equipped apparatus mandate low component …

Notas de Diseño

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Techniques for Deriving 3.3V from 5V Supplies &mdash DN74
PDF, 73 Kb, Archivo publicado: sept 1, 1993
Extracto del documento
advertisement Techniques for Deriving 3.3V from 5V Supplies вЂ“ Design Note 74
Mitchell Lee
Microprocessor chip sets and logic families that operate from 3.3V supplies are gaining acceptance in both
desktop and portable computers. Computing rates, and
in most cases, energy consumed by these circuits show
a strong improvement over 5V technology. The main
power supply in most systems is still 5V, necessitating
a local 5V to 3.3V regulator.
Linear regulators are viable solutions at lower (IO в‰¤ 1A)
currents, but they must have a low dropout voltage in
order to maintain regulation with a worst-case input
5 4.5V TO 5.5V IN OUT 1 + LT1129-3.3
4 SHUTDOWN SENSE 2 GND 3.3V OUT
700mA
3.3ОјF
SOLID TANTALUM of only 4.5V. Figure 1 shows a circuit that converts a
4.5V minimum input to 3.3V with an output tolerance
of only 3% (100mV). The LTВ®1129-3.3 can handle up to
700mA in surface mount conп¬Ѓgurations, and includes
both 16ОјA shutdown and 50ОјA standby currents for
system sleep modes. Unlike other linear regulators, the
LT1129-3.3 combines both low dropout and low voltage
operation. Small input and output capacitors facilitate …
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5V to 3.3V Regulator with Fail-Safe Switchover &mdash DN82
PDF, 74 Kb, Archivo publicado: mayo 1, 1994
Extracto del documento
advertisement 5V to 3.3V Regulator with Fail-Safe Switchover вЂ“ Design Note 82
Mitchell Lee
Newer microprocessors designed for replacing existing
5V units operate from lower voltage supplies. In the past
a processor swap was simply a matter of removing one
IC and replacing it with an updated version. But now
the upgrade path involves switching from a 5V chip to
one that requires 3.xxV.
One means of changing supply voltage from 5V to 3.xxV
is to clip a jumper that bypasses a local 3.xxV regulator.
This is not a good solution since it leaves too much to
chance. Failure to remove the jumper can result in the
instant destruction of the new microprocessor upon
application of power. A means of automatically sensing
the presence of a 3.xxV or 5V processor is necessary.
Intel microprocessors include a special pin called
вЂњVOLDETвЂќ which can be used to determine whether
or not a particular chip needs 3.xxV or 5V. Figure 1
shows a simple circuit that takes advantage of this
pin to automatically вЂњjumper outвЂќ a 3.xxV regulator
whenever a 5V processor is inserted into the socket. VOLDET is pulled low on 3.xx processors; it is buffered
by transistor Q2 which grounds the gate of a bypassing
switch (Q1). Q1 is turned off leaving the LTВ®1085 to …
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5V to 3.3V Circuit Collection &mdash DN91
PDF, 74 Kb, Archivo publicado: nov 1, 1994
Extracto del documento
advertisement 5V to 3.3V Circuit Collection вЂ“ Design Note 91
Richard Markell and Craig Varga
High Efп¬Ѓciency 3.3V Regulator
INPUT
VOLTAGE
5V + 6
VIN
7
3 IPGM SHDN 8 3.3V Battery-Powered Supply with Shutdown
8 3w
22ОјF*
25V LBIN 50ОјHвЂ GND 1N5818 + 2w
47ОјF**
16V 4 * AVX TPSD226K025
** AVX TPSD476K016
вЂ COILTRONICS CTX50-4 OUT 1 LT1121-3.3 5V
5 1
VOUT
LTC1174-3.3
2
5
LBOUT
SW IN 0.1ОјF + 1ОјF …

Linea modelo

Serie: LT1129 (46)

LT1129CQ#PBF LT1129CQ#TRPBF LT1129CQ-3.3#PBF LT1129CQ-3.3#TRPBF LT1129CQ-5#PBF LT1129CQ-5#TRPBF LT1129CS8#PBF LT1129CS8#TRPBF LT1129CS8-3.3#PBF LT1129CS8-3.3#TRPBF LT1129CS8-5#PBF LT1129CS8-5#TRPBF LT1129CST-3.3#PBF LT1129CST-3.3#TRPBF LT1129CST-5#PBF LT1129CST-5#TRPBF LT1129CT#PBF LT1129CT-3.3#06PBF LT1129CT-3.3#PBF LT1129CT-5#06PBF LT1129CT-5#PBF LT1129IQ#PBF LT1129IQ#TRPBF LT1129IQ-3.3#PBF LT1129IQ-3.3#TRPBF LT1129IQ-5#PBF LT1129IQ-5#TRPBF LT1129IS8#PBF LT1129IS8#TRPBF LT1129IS8-3.3#PBF LT1129IS8-3.3#TRPBF LT1129IS8-5#PBF LT1129IS8-5#TRPBF LT1129IST-3.3#PBF LT1129IST-3.3#TRPBF LT1129IST-5#PBF LT1129IST-5#TRPBF LT1129IT#06PBF LT1129IT#PBF LT1129IT-3.3#PBF LT1129IT-5#06PBF LT1129IT-5#PBF LT1129MPST-3.3 LT1129MPST-3.3#PBF LT1129MPST-3.3#TR LT1129MPST-3.3#TRPBF

Clasificación del fabricante

Power Management > LDO Linear Regulators > Positive Linear Regulators (LDO) | Extended Temperature (H & MP) Linear Regulators